FSF GCC version 2.7.2

1 files changed, 7527 insertions, 0 deletions

diff --git a/gnu/usr.bin/gcc/cpplib.c b/gnu/usr.bin/gcc/cpplib.c
new file mode 100644
index 00000000000..8e91a099d81
--- /dev/null
+++ b/gnu/usr.bin/gcc/cpplib.c
@@ -0,0 +1,7527 @@
+/* CPP Library.
+   Copyright (C) 1986, 87, 89, 92, 93, 94, 1995 Free Software Foundation, Inc.
+   Written by Per Bothner, 1994-95.
+   Based on CCCP program by by Paul Rubin, June 1986
+   Adapted to ANSI C, Richard Stallman, Jan 1987
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ In other words, you are welcome to use, share and improve this program.
+ You are forbidden to forbid anyone else to use, share and improve
+ what you give them.   Help stamp out software-hoarding!  */
+
+#ifdef EMACS
+#define NO_SHORTNAMES
+#include "../src/config.h"
+#ifdef open
+#undef open
+#undef read
+#undef write
+#endif /* open */
+#endif /* EMACS */
+
+/* The macro EMACS is defined when cpp is distributed as part of Emacs,
+   for the sake of machines with limited C compilers.  */
+#ifndef EMACS
+#include "config.h"
+#endif /* not EMACS */
+
+#ifndef STANDARD_INCLUDE_DIR
+#define STANDARD_INCLUDE_DIR "/usr/include"
+#endif
+
+#ifndef LOCAL_INCLUDE_DIR
+#define LOCAL_INCLUDE_DIR "/usr/local/include"
+#endif
+
+#if 0 /* We can't get ptrdiff_t, so I arranged not to need PTR_INT_TYPE.  */
+#ifdef __STDC__
+#define PTR_INT_TYPE ptrdiff_t
+#else
+#define PTR_INT_TYPE long
+#endif
+#endif /* 0 */
+
+#include "cpplib.h"
+#include "cpphash.h"
+
+#ifndef STDC_VALUE
+#define STDC_VALUE 1
+#endif
+
+/* By default, colon separates directories in a path.  */
+#ifndef PATH_SEPARATOR
+#define PATH_SEPARATOR ':'
+#endif
+
+#include <ctype.h>
+#include <stdio.h>
+#include <signal.h>
+#ifdef __STDC__
+#include <stdlib.h>
+#endif
+
+#ifndef VMS
+#ifndef USG
+#include <sys/time.h>		/* for __DATE__ and __TIME__ */
+#include <sys/resource.h>
+#else
+#include <sys/param.h>			/* CYGNUS LOCAL: shebs -noquiet */
+#include <sys/times.h>
+#include <time.h>
+#include <fcntl.h>
+#endif /* USG */
+#endif /* not VMS */
+
+/* This defines "errno" properly for VMS, and gives us EACCES. */
+#include <errno.h>
+
+extern char *index ();
+extern char *rindex ();
+
+#ifndef O_RDONLY
+#define O_RDONLY 0
+#endif
+
+#undef MIN
+#undef MAX
+#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
+#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
+
+/* Find the largest host integer type and set its size and type.  */
+
+#ifndef HOST_BITS_PER_WIDE_INT
+
+#if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
+#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
+#define HOST_WIDE_INT long
+#else
+#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
+#define HOST_WIDE_INT int
+#endif
+
+#endif
+
+#ifndef S_ISREG
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#endif
+
+#ifndef S_ISDIR
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+
+/* Define a generic NULL if one hasn't already been defined.  */
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+#ifndef GENERIC_PTR
+#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
+#define GENERIC_PTR void *
+#else
+#define GENERIC_PTR char *
+#endif
+#endif
+
+#ifndef NULL_PTR
+#define NULL_PTR ((GENERIC_PTR)0)
+#endif
+
+#ifndef INCLUDE_LEN_FUDGE
+#define INCLUDE_LEN_FUDGE 0
+#endif
+
+/* Symbols to predefine.  */
+
+#ifdef CPP_PREDEFINES
+static char *predefs = CPP_PREDEFINES;
+#else
+static char *predefs = "";
+#endif
+
+/* We let tm.h override the types used here, to handle trivial differences
+   such as the choice of unsigned int or long unsigned int for size_t.
+   When machines start needing nontrivial differences in the size type,
+   it would be best to do something here to figure out automatically
+   from other information what type to use.  */
+
+/* The string value for __SIZE_TYPE__.  */
+
+#ifndef SIZE_TYPE
+#define SIZE_TYPE "long unsigned int"
+#endif
+
+/* The string value for __PTRDIFF_TYPE__.  */
+
+#ifndef PTRDIFF_TYPE
+#define PTRDIFF_TYPE "long int"
+#endif
+
+/* The string value for __WCHAR_TYPE__.  */
+
+#ifndef WCHAR_TYPE
+#define WCHAR_TYPE "int"
+#endif
+#define CPP_WCHAR_TYPE(PFILE) \
+	(CPP_OPTIONS (PFILE)->cplusplus ? "__wchar_t" : WCHAR_TYPE)
+
+/* The string value for __USER_LABEL_PREFIX__ */
+
+#ifndef USER_LABEL_PREFIX
+#define USER_LABEL_PREFIX ""
+#endif
+
+/* The string value for __REGISTER_PREFIX__ */
+
+#ifndef REGISTER_PREFIX
+#define REGISTER_PREFIX ""
+#endif
+
+/* In the definition of a #assert name, this structure forms
+   a list of the individual values asserted.
+   Each value is itself a list of "tokens".
+   These are strings that are compared by name.  */
+
+struct tokenlist_list {
+  struct tokenlist_list *next;
+  struct arglist *tokens;
+};
+
+struct assertion_hashnode {
+  struct assertion_hashnode *next;	/* double links for easy deletion */
+  struct assertion_hashnode *prev;
+  /* also, a back pointer to this node's hash
+     chain is kept, in case the node is the head
+     of the chain and gets deleted. */
+  struct assertion_hashnode **bucket_hdr;
+  int length;			/* length of token, for quick comparison */
+  U_CHAR *name;			/* the actual name */
+  /* List of token-sequences.  */
+  struct tokenlist_list *value;
+};
+
+#define SKIP_WHITE_SPACE(p) do { while (is_hor_space[*p]) p++; } while (0)
+#define SKIP_ALL_WHITE_SPACE(p) do { while (is_space[*p]) p++; } while (0)
+
+#define PEEKN(N) (CPP_BUFFER (pfile)->rlimit - CPP_BUFFER (pfile)->cur >= (N) ? CPP_BUFFER (pfile)->cur[N] : EOF)
+#define FORWARD(N) CPP_FORWARD (CPP_BUFFER (pfile), (N))
+#define GETC() CPP_BUF_GET (CPP_BUFFER (pfile))
+#define PEEKC() CPP_BUF_PEEK (CPP_BUFFER (pfile))
+/* CPP_IS_MACRO_BUFFER is true if the buffer contains macro expansion.
+   (Note that it is false while we're expanding marco *arguments*.) */
+#define CPP_IS_MACRO_BUFFER(PBUF) ((PBUF)->cleanup == macro_cleanup)
+
+/* Move all backslash-newline pairs out of embarrassing places.
+   Exchange all such pairs following BP
+   with any potentially-embarrassing characters that follow them.
+   Potentially-embarrassing characters are / and *
+   (because a backslash-newline inside a comment delimiter
+   would cause it not to be recognized).  */
+
+#define NEWLINE_FIX \
+  do {while (PEEKC() == '\\' && PEEKN(1) == '\n') FORWARD(2); } while(0)
+
+/* Same, but assume we've already read the potential '\\' into C. */
+#define NEWLINE_FIX1(C) do { \
+    while ((C) == '\\' && PEEKC() == '\n') { FORWARD(1); (C) = GETC(); }\
+  } while(0)
+
+struct cpp_pending {
+  struct cpp_pending *next;
+  char *cmd;
+  char *arg;
+};
+
+/* Forward declarations.  */
+
+extern char *xmalloc ();
+
+static void add_import ();
+static void append_include_chain ();
+static void make_undef ();
+static void make_assertion ();
+static void path_include ();
+static void initialize_builtins ();
+static void initialize_char_syntax ();
+static void dump_arg_n ();
+static void dump_defn_1 ();
+extern void delete_macro ();
+static void trigraph_pcp ();
+static int finclude ();
+static void validate_else ();
+static int comp_def_part ();
+extern void fancy_abort ();
+static void pipe_closed ();
+static void print_containing_files ();
+static int lookup_import ();
+static int redundant_include_p ();
+static is_system_include ();
+static struct file_name_map *read_name_map ();
+static char *read_filename_string ();
+static int open_include_file ();
+static int check_preconditions ();
+static void pcfinclude ();
+static void pcstring_used ();
+static int check_macro_name ();
+static int compare_defs ();
+static int compare_token_lists ();
+static HOST_WIDE_INT eval_if_expression ();
+static int change_newlines ();
+extern int hashf ();
+static int file_size_and_mode ();
+static struct arglist *read_token_list ();
+static void free_token_list ();
+static int safe_read ();
+static void push_macro_expansion PARAMS ((cpp_reader *,
+					  U_CHAR*, int, HASHNODE*));
+static struct cpp_pending *nreverse_pending PARAMS ((struct cpp_pending*));
+extern char *xrealloc ();
+extern char *xcalloc ();
+static char *savestring ();
+
+static void conditional_skip ();
+static void skip_if_group ();
+
+/* Last arg to output_line_command.  */
+enum file_change_code {same_file, enter_file, leave_file};
+
+/* External declarations.  */
+
+extern HOST_WIDE_INT cpp_parse_expr PARAMS ((cpp_reader*));
+
+extern char *getenv ();
+extern FILE *fdopen ();
+extern char *version_string;
+extern struct tm *localtime ();
+
+/* These functions are declared to return int instead of void since they
+   are going to be placed in a table and some old compilers have trouble with
+   pointers to functions returning void.  */
+
+static int do_define ();
+static int do_line ();
+static int do_include ();
+static int do_undef ();
+static int do_error ();
+static int do_pragma ();
+static int do_ident ();
+static int do_if ();
+static int do_xifdef ();
+static int do_else ();
+static int do_elif ();
+static int do_endif ();
+static int do_sccs ();
+static int do_once ();
+static int do_assert ();
+static int do_unassert ();
+static int do_warning ();
+
+struct file_name_list
+  {
+    struct file_name_list *next;
+    char *fname;
+    /* If the following is nonzero, it is a macro name.
+       Don't include the file again if that macro is defined.  */
+    U_CHAR *control_macro;
+    /* If the following is nonzero, it is a C-language system include
+       directory.  */
+    int c_system_include_path;
+    /* Mapping of file names for this directory.  */
+    struct file_name_map *name_map;
+    /* Non-zero if name_map is valid.  */
+    int got_name_map;
+  };
+
+/* If a buffer's dir field is SELF_DIR_DUMMY, it means the file was found
+   via the same directory as the file that #included it. */
+#define SELF_DIR_DUMMY ((struct file_name_list*)(~0))
+
+/* #include "file" looks in source file dir, then stack. */
+/* #include <file> just looks in the stack. */
+/* -I directories are added to the end, then the defaults are added. */
+/* The */
+static struct default_include {
+  char *fname;			/* The name of the directory.  */
+  int cplusplus;		/* Only look here if we're compiling C++.  */
+  int cxx_aware;		/* Includes in this directory don't need to
+				   be wrapped in extern "C" when compiling
+				   C++.  */
+} include_defaults_array[]
+#ifdef INCLUDE_DEFAULTS
+  = INCLUDE_DEFAULTS;
+#else
+  = {
+    /* Pick up GNU C++ specific include files.  */
+    { GPLUSPLUS_INCLUDE_DIR, 1, 1 },
+#ifdef CROSS_COMPILE
+    /* This is the dir for fixincludes.  Put it just before
+       the files that we fix.  */
+    { GCC_INCLUDE_DIR, 0, 0 },
+    /* For cross-compilation, this dir name is generated
+       automatically in Makefile.in.  */
+    { CROSS_INCLUDE_DIR, 0, 0 },
+    /* This is another place that the target system's headers might be.  */
+    { TOOL_INCLUDE_DIR, 0, 1 },
+#else /* not CROSS_COMPILE */
+    /* This should be /usr/local/include and should come before
+       the fixincludes-fixed header files.  */
+    { LOCAL_INCLUDE_DIR, 0, 1 },
+    /* This is here ahead of GCC_INCLUDE_DIR because assert.h goes here.
+       Likewise, behind LOCAL_INCLUDE_DIR, where glibc puts its assert.h.  */
+    { TOOL_INCLUDE_DIR, 0, 1 },
+    /* This is the dir for fixincludes.  Put it just before
+       the files that we fix.  */
+    { GCC_INCLUDE_DIR, 0, 0 },
+    /* Some systems have an extra dir of include files.  */
+#ifdef SYSTEM_INCLUDE_DIR
+    { SYSTEM_INCLUDE_DIR, 0, 0 },
+#endif
+    { STANDARD_INCLUDE_DIR, 0, 0 },
+#endif /* not CROSS_COMPILE */
+    { 0, 0, 0 }
+    };
+#endif /* no INCLUDE_DEFAULTS */
+
+/* `struct directive' defines one #-directive, including how to handle it.  */
+
+struct directive {
+  int length;			/* Length of name */
+  int (*func)();		/* Function to handle directive */
+  char *name;			/* Name of directive */
+  enum node_type type;		/* Code which describes which directive. */
+  char command_reads_line;      /* One if rest of line is read by func. */
+  char traditional_comments;	/* Nonzero: keep comments if -traditional.  */
+  char pass_thru;		/* Copy preprocessed directive to output file.*/
+};
+
+/* Here is the actual list of #-directives, most-often-used first.
+   The initialize_builtins function assumes #define is the very first.  */
+
+static struct directive directive_table[] = {
+  {  6, do_define, "define", T_DEFINE, 0, 1},
+  {  5, do_xifdef, "ifdef", T_IFDEF, 1},
+  {  6, do_xifdef, "ifndef", T_IFNDEF, 1},
+  {  7, do_include, "include", T_INCLUDE, 1},
+  { 12, do_include, "include_next", T_INCLUDE_NEXT, 1},
+  {  6, do_include, "import", T_IMPORT, 1},
+  {  5, do_endif, "endif", T_ENDIF, 1},
+  {  4, do_else, "else", T_ELSE, 1},
+  {  2, do_if, "if", T_IF, 1},
+  {  4, do_elif, "elif", T_ELIF, 1},
+  {  5, do_undef, "undef", T_UNDEF},
+  {  5, do_error, "error", T_ERROR},
+  {  7, do_warning, "warning", T_WARNING},
+  {  6, do_pragma, "pragma", T_PRAGMA, 0, 0, 1},
+  {  4, do_line, "line", T_LINE, 1},
+  {  5, do_ident, "ident", T_IDENT, 1, 0, 1},
+#ifdef SCCS_DIRECTIVE
+  {  4, do_sccs, "sccs", T_SCCS},
+#endif
+  {  6, do_assert, "assert", T_ASSERT, 1},
+  {  8, do_unassert, "unassert", T_UNASSERT, 1},
+  {  -1, 0, "", T_UNUSED},
+};
+
+/* table to tell if char can be part of a C identifier. */
+U_CHAR is_idchar[256];
+/* table to tell if char can be first char of a c identifier. */
+U_CHAR is_idstart[256];
+/* table to tell if c is horizontal space.  */
+U_CHAR is_hor_space[256];
+/* table to tell if c is horizontal or vertical space.  */
+static U_CHAR is_space[256];
+
+/* Initialize syntactic classifications of characters.  */
+
+static void
+initialize_char_syntax (opts)
+     struct cpp_options *opts;
+{
+  register int i;
+
+  /*
+   * Set up is_idchar and is_idstart tables.  These should be
+   * faster than saying (is_alpha (c) || c == '_'), etc.
+   * Set up these things before calling any routines tthat
+   * refer to them.
+   */
+  for (i = 'a'; i <= 'z'; i++) {
+    is_idchar[i - 'a' + 'A'] = 1;
+    is_idchar[i] = 1;
+    is_idstart[i - 'a' + 'A'] = 1;
+    is_idstart[i] = 1;
+  }
+  for (i = '0'; i <= '9'; i++)
+    is_idchar[i] = 1;
+  is_idchar['_'] = 1;
+  is_idstart['_'] = 1;
+  is_idchar['$'] = opts->dollars_in_ident;
+  is_idstart['$'] = opts->dollars_in_ident;
+
+  /* horizontal space table */
+  is_hor_space[' '] = 1;
+  is_hor_space['\t'] = 1;
+  is_hor_space['\v'] = 1;
+  is_hor_space['\f'] = 1;
+  is_hor_space['\r'] = 1;
+
+  is_space[' '] = 1;
+  is_space['\t'] = 1;
+  is_space['\v'] = 1;
+  is_space['\f'] = 1;
+  is_space['\n'] = 1;
+  is_space['\r'] = 1;
+}
+
+
+/* Place into PFILE a quoted string representing the string SRC.
+   Caller must reserve enough space in pfile->token_buffer. */
+static void
+quote_string (pfile, src)
+     cpp_reader *pfile;
+     char *src;
+{
+  U_CHAR c;
+
+  CPP_PUTC_Q (pfile, '\"');
+  for (;;)
+    switch ((c = *src++))
+      {
+      default:
+        if (isprint (c))
+	  CPP_PUTC_Q (pfile, c);
+	else
+	  {
+	    sprintf (CPP_PWRITTEN (pfile), "\\%03o", c);
+	    CPP_ADJUST_WRITTEN (pfile, 4);
+	  }
+	break;
+
+      case '\"':
+      case '\\':
+	CPP_PUTC_Q (pfile, '\\');
+	CPP_PUTC_Q (pfile, c);
+	break;
+      
+      case '\0':
+	CPP_PUTC_Q (pfile, '\"');
+	CPP_NUL_TERMINATE_Q (pfile);
+	return;
+      }
+}
+
+/* Make sure PFILE->token_buffer will hold at least N more chars. */
+
+void
+cpp_grow_buffer (pfile, n)
+     cpp_reader *pfile;
+     long n;
+{
+  long old_written = CPP_WRITTEN (pfile);
+  pfile->token_buffer_size = n + 2 * pfile->token_buffer_size;
+  pfile->token_buffer = (U_CHAR*)
+    xrealloc(pfile->token_buffer, pfile->token_buffer_size);
+  CPP_SET_WRITTEN (pfile, old_written);
+}
+
+
+/*
+ * process a given definition string, for initialization
+ * If STR is just an identifier, define it with value 1.
+ * If STR has anything after the identifier, then it should
+ * be identifier=definition.
+ */
+
+void
+cpp_define (pfile, str)
+     cpp_reader *pfile;
+     U_CHAR *str;
+{
+  U_CHAR *buf, *p;
+
+  buf = str;
+  p = str;
+  if (!is_idstart[*p])
+    {
+      cpp_error (pfile, "malformed option `-D %s'", str);
+      return;
+    }
+  while (is_idchar[*++p])
+    ;
+  if (*p == 0)
+    {
+      buf = (U_CHAR *) alloca (p - buf + 4);
+      strcpy ((char *)buf, str);
+      strcat ((char *)buf, " 1");
+    }
+  else if (*p != '=')
+    {
+      cpp_error (pfile, "malformed option `-D %s'", str);
+      return;
+    }
+  else
+    {
+      U_CHAR *q;
+      /* Copy the entire option so we can modify it.  */
+      buf = (U_CHAR *) alloca (2 * strlen (str) + 1);
+      strncpy (buf, str, p - str);
+      /* Change the = to a space.  */
+      buf[p - str] = ' ';
+      /* Scan for any backslash-newline and remove it.  */
+      p++;
+      q = &buf[p - str];
+      while (*p)
+	{
+      if (*p == '\\' && p[1] == '\n')
+	p += 2;
+      else
+	*q++ = *p++;
+    }
+    *q = 0;
+  }
+  
+  do_define (pfile, NULL, buf, buf + strlen (buf));
+}
+
+/* Process the string STR as if it appeared as the body of a #assert.
+   OPTION is the option name for which STR was the argument.  */
+
+static void
+make_assertion (pfile, option, str)
+     cpp_reader *pfile;
+     char *option;
+     U_CHAR *str;
+{
+  cpp_buffer *ip;
+  struct directive *kt;
+  U_CHAR *buf, *p, *q;
+
+  /* Copy the entire option so we can modify it.  */
+  buf = (U_CHAR *) alloca (strlen (str) + 1);
+  strcpy ((char *) buf, str);
+  /* Scan for any backslash-newline and remove it.  */
+  p = q = buf;
+  while (*p) {
+#if 0
+    if (*p == '\\' && p[1] == '\n')
+      p += 2;
+    else
+#endif
+      *q++ = *p++;
+  }
+  *q = 0;
+
+  p = buf;
+  if (!is_idstart[*p]) {
+    cpp_error (pfile, "malformed option `%s %s'", option, str);
+    return;
+  }
+  while (is_idchar[*++p])
+    ;
+  while (*p == ' ' || *p == '\t') p++;
+  if (! (*p == 0 || *p == '(')) {
+    cpp_error (pfile, "malformed option `%s %s'", option, str);
+    return;
+  }
+  
+  ip = cpp_push_buffer (pfile, buf, strlen (buf));
+  do_assert (pfile, NULL, NULL, NULL);
+  cpp_pop_buffer (pfile);
+}
+
+/* Append a chain of `struct file_name_list's
+   to the end of the main include chain.
+   FIRST is the beginning of the chain to append, and LAST is the end.  */
+
+static void
+append_include_chain (pfile, first, last)
+     cpp_reader *pfile;
+     struct file_name_list *first, *last;
+{
+  struct cpp_options *opts = CPP_OPTIONS (pfile);
+  struct file_name_list *dir;
+
+  if (!first || !last)
+    return;
+
+  if (opts->include == 0)
+    opts->include = first;
+  else
+    opts->last_include->next = first;
+
+  if (opts->first_bracket_include == 0)
+    opts->first_bracket_include = first;
+
+  for (dir = first; ; dir = dir->next) {
+    int len = strlen (dir->fname) + INCLUDE_LEN_FUDGE;
+    if (len > pfile->max_include_len)
+      pfile->max_include_len = len;
+    if (dir == last)
+      break;
+  }
+
+  last->next = NULL;
+  opts->last_include = last;
+}
+
+/* Add output to `deps_buffer' for the -M switch.
+   STRING points to the text to be output.
+   SPACER is ':' for targets, ' ' for dependencies, zero for text
+   to be inserted literally.  */
+
+static void
+deps_output (pfile, string, spacer)
+     cpp_reader *pfile;
+     char *string;
+     int spacer;
+{
+  int size = strlen (string);
+
+  if (size == 0)
+    return;
+
+#ifndef MAX_OUTPUT_COLUMNS
+#define MAX_OUTPUT_COLUMNS 72
+#endif
+  if (spacer
+      && pfile->deps_column > 0
+      && (pfile->deps_column + size) > MAX_OUTPUT_COLUMNS)
+    {
+      deps_output (pfile, " \\\n  ", 0);
+      pfile->deps_column = 0;
+    }
+
+  if (pfile->deps_size + size + 8 > pfile->deps_allocated_size)
+    {
+      pfile->deps_allocated_size = (pfile->deps_size + size + 50) * 2;
+      pfile->deps_buffer = (char *) xrealloc (pfile->deps_buffer,
+					      pfile->deps_allocated_size);
+    }
+  if (spacer == ' ' && pfile->deps_column > 0)
+    pfile->deps_buffer[pfile->deps_size++] = ' ';
+  bcopy (string, &pfile->deps_buffer[pfile->deps_size], size);
+  pfile->deps_size += size;
+  pfile->deps_column += size;
+  if (spacer == ':')
+    pfile->deps_buffer[pfile->deps_size++] = ':';
+  pfile->deps_buffer[pfile->deps_size] = 0;
+}
+
+/* Given a colon-separated list of file names PATH,
+   add all the names to the search path for include files.  */
+
+static void
+path_include (pfile, path)
+     cpp_reader *pfile;
+     char *path;
+{
+  char *p;
+
+  p = path;
+
+  if (*p)
+    while (1) {
+      char *q = p;
+      char *name;
+      struct file_name_list *dirtmp;
+
+      /* Find the end of this name.  */
+      while (*q != 0 && *q != PATH_SEPARATOR) q++;
+      if (p == q) {
+	/* An empty name in the path stands for the current directory.  */
+	name = (char *) xmalloc (2);
+	name[0] = '.';
+	name[1] = 0;
+      } else {
+	/* Otherwise use the directory that is named.  */
+	name = (char *) xmalloc (q - p + 1);
+	bcopy (p, name, q - p);
+	name[q - p] = 0;
+      }
+
+      dirtmp = (struct file_name_list *)
+	xmalloc (sizeof (struct file_name_list));
+      dirtmp->next = 0;		/* New one goes on the end */
+      dirtmp->control_macro = 0;
+      dirtmp->c_system_include_path = 0;
+      dirtmp->fname = name;
+      dirtmp->got_name_map = 0;
+      append_include_chain (pfile, dirtmp, dirtmp);
+
+      /* Advance past this name.  */
+      p = q;
+      if (*p == 0)
+	break;
+      /* Skip the colon.  */
+      p++;
+    }
+}
+
+void
+init_parse_options (opts)
+     struct cpp_options *opts;
+{
+  bzero ((char *) opts, sizeof *opts);
+  opts->in_fname = NULL;
+  opts->out_fname = NULL;
+
+  /* Initialize is_idchar to allow $.  */
+  opts->dollars_in_ident = 1;
+  initialize_char_syntax (opts);
+  opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 0;
+
+  opts->no_line_commands = 0;
+  opts->no_trigraphs = 1;
+  opts->put_out_comments = 0;
+  opts->print_include_names = 0;
+  opts->dump_macros = dump_none;
+  opts->no_output = 0;
+  opts->cplusplus = 0;
+  opts->cplusplus_comments = 0;
+
+  opts->verbose = 0;
+  opts->objc = 0;
+  opts->lang_asm = 0;
+  opts->for_lint = 0;
+  opts->chill = 0;
+  opts->pedantic_errors = 0;
+  opts->inhibit_warnings = 0;
+  opts->warn_comments = 0;
+  opts->warn_import = 1;
+  opts->warnings_are_errors = 0;
+}
+
+enum cpp_token
+null_underflow (pfile)
+     cpp_reader *pfile;
+{
+  return CPP_EOF;
+}
+
+int
+null_cleanup (pbuf, pfile)
+     cpp_buffer *pbuf;
+     cpp_reader *pfile;
+{
+  return 0;
+}
+
+int
+macro_cleanup (pbuf, pfile)
+     cpp_buffer *pbuf;
+     cpp_reader *pfile;
+{
+  HASHNODE *macro = (HASHNODE*)pbuf->data;
+  if (macro->type == T_DISABLED)
+    macro->type = T_MACRO;
+  if (macro->type != T_MACRO || pbuf->buf != macro->value.defn->expansion)
+    free (pbuf->buf);
+  return 0;
+}
+
+int
+file_cleanup (pbuf, pfile)
+     cpp_buffer *pbuf;
+     cpp_reader *pfile;
+{
+  if (pbuf->buf)
+    {
+      free (pbuf->buf);
+      pbuf->buf = 0;
+    }
+  return 0;
+}
+
+static void
+newline_fix (pfile)
+     cpp_reader *pfile;
+{
+#if 1
+  NEWLINE_FIX;
+#else
+  register U_CHAR *p = bp;
+
+  /* First count the backslash-newline pairs here.  */
+
+  while (p[0] == '\\' && p[1] == '\n')
+    p += 2;
+
+  /* What follows the backslash-newlines is not embarrassing.  */
+
+  if (*p != '/' && *p != '*')
+    return;
+
+  /* Copy all potentially embarrassing characters
+     that follow the backslash-newline pairs
+     down to where the pairs originally started.  */
+
+  while (*p == '*' || *p == '/')
+    *bp++ = *p++;
+
+  /* Now write the same number of pairs after the embarrassing chars.  */
+  while (bp < p) {
+    *bp++ = '\\';
+    *bp++ = '\n';
+  }
+#endif
+}
+
+/* Assuming we have read '/'.
+   If this is the start of a comment (followed by '*' or '/'),
+   skip to the end of the comment, and return ' '.
+   Return EOF if we reached the end of file before the end of the comment.
+   If not the start of a comment, return '/'. */
+
+static int
+skip_comment (pfile, linep)
+     cpp_reader *pfile;
+     long *linep;
+{
+  int c;
+  while (PEEKC() == '\\' && PEEKN(1) == '\n')
+    {
+      if (linep)
+	(*linep)++;
+      FORWARD(2);
+    }
+  if (PEEKC() == '*')
+    {
+      FORWARD(1);
+      for (;;)
+	{
+	  int prev_c = c;
+	  c = GETC ();
+	  if (c == EOF)
+	    return EOF;
+	  while (c == '\\' && PEEKC() == '\n')
+	    {
+	      if (linep)
+		(*linep)++;
+	      FORWARD(1), c = GETC();
+	    }
+	  if (prev_c == '*' && c == '/')
+	    return ' ';
+	  if (c == '\n' && linep)
+	    (*linep)++;
+	}
+    }
+  else if (PEEKC() == '/' && CPP_OPTIONS (pfile)->cplusplus_comments)
+    {
+      FORWARD(1);
+      for (;;)
+	{
+	  c = GETC ();
+	  if (c == EOF)
+	    return ' '; /* Allow // to be terminated by EOF. */
+	  while (c == '\\' && PEEKC() == '\n')
+	    {
+	      FORWARD(1);
+	      c = GETC();
+	      if (linep)
+		(*linep)++;
+	    }
+	  if (c == '\n')
+	    {
+	      /* Don't consider final '\n' to be part of comment. */
+	      FORWARD(-1);
+	      return ' ';
+	    }
+	}
+    }
+  else
+    return '/';
+}     
+
+/* Skip whitespace \-newline and comments.  Does not macro-expand.  */
+void
+cpp_skip_hspace (pfile)
+     cpp_reader *pfile;
+{
+  while (1)
+    {
+      int c = PEEKC();
+      if (c == EOF)
+	return; /* FIXME */
+      if (is_hor_space[c])
+	{
+	  if ((c == '\f' || c == '\v') && CPP_PEDANTIC (pfile))
+	    cpp_pedwarn (pfile, "%s in preprocessing directive",
+			 c == '\f' ? "formfeed" : "vertical tab");
+	  FORWARD(1);
+	}
+      else if (c == '/')
+	{
+	  FORWARD (1);
+	  c = skip_comment (pfile, NULL);
+	  if (c == '/')
+	    FORWARD(-1);
+	  if (c == EOF || c == '/')
+	    return;
+	}
+      else if (c == '\\' && PEEKN(1) == '\n') {
+	FORWARD(2);
+      }
+      else if (c == '@' && CPP_BUFFER (pfile)->has_escapes
+	       && is_hor_space[PEEKN(1)])
+	FORWARD(2);
+      else return;
+    }
+}
+
+/* Read the rest of the current line.
+   The line is appended to PFILE's output buffer. */
+
+void
+copy_rest_of_line (pfile)
+     cpp_reader *pfile;
+{
+  struct cpp_options *opts = CPP_OPTIONS (pfile);
+  for (;;)
+    {
+      int c = GETC();
+      int nextc;
+      switch (c)
+	{
+	case EOF:
+	  goto end_directive;
+	case '\\':
+	  if (PEEKC() == '\n')
+	    {
+	      FORWARD (1);
+	      continue;
+	    }
+	case '\'':
+	case '\"':
+	  goto scan_directive_token;
+	  break;
+	case '/':
+	  nextc = PEEKC();
+	  if (nextc == '*' || (opts->cplusplus_comments && nextc == '*'))
+	    goto scan_directive_token;
+	  break;
+	case '\f':
+	case '\v':
+	  if (CPP_PEDANTIC (pfile))
+	    cpp_pedwarn (pfile, "%s in preprocessing directive",
+			 c == '\f' ? "formfeed" : "vertical tab");
+	  break;
+
+	case '\n':
+	  FORWARD(-1);
+	  goto end_directive;
+	scan_directive_token:
+	  FORWARD(-1);
+	  cpp_get_token (pfile);
+	  continue;
+	}
+      CPP_PUTC (pfile, c);
+    }
+ end_directive: ;
+  CPP_NUL_TERMINATE (pfile);
+}
+
+void
+skip_rest_of_line (pfile)
+     cpp_reader *pfile;
+{
+  long old = CPP_WRITTEN (pfile);
+  copy_rest_of_line (pfile);
+  CPP_SET_WRITTEN (pfile, old);
+}
+
+/* Handle a possible # directive.
+   '#' has already been read.  */
+
+int
+handle_directive (pfile)
+     cpp_reader *pfile;
+{ int c;
+  register struct directive *kt;
+  int ident_length;
+  long after_ident;
+  U_CHAR *ident, *line_end;
+  long old_written = CPP_WRITTEN (pfile);
+
+  cpp_skip_hspace (pfile);
+
+  c = PEEKC ();
+  if (c >= '0' && c <= '9')
+    {
+      /* Handle # followed by a line number.  */
+      if (CPP_PEDANTIC (pfile))
+	cpp_pedwarn (pfile, "`#' followed by integer");
+      do_line (pfile, NULL);
+      goto done_a_directive;
+    }
+
+  /* Now find the directive name. */
+  CPP_PUTC (pfile, '#');
+  parse_name (pfile, GETC());
+  ident = pfile->token_buffer + old_written + 1;
+  ident_length = CPP_PWRITTEN (pfile) - ident;
+  if (ident_length == 0 && PEEKC() == '\n')
+    {
+      /* A line of just `#' becomes blank.  */
+      goto done_a_directive;
+    }
+
+#if 0
+  if (ident_length == 0 || !is_idstart[*ident]) {
+    U_CHAR *p = ident;
+    while (is_idchar[*p]) {
+      if (*p < '0' || *p > '9')
+	break;
+      p++;
+    }
+    /* Avoid error for `###' and similar cases unless -pedantic.  */
+    if (p == ident) {
+      while (*p == '#' || is_hor_space[*p]) p++;
+      if (*p == '\n') {
+	if (pedantic && !lang_asm)
+	  cpp_warning (pfile, "invalid preprocessor directive");
+	return 0;
+      }
+    }
+
+    if (!lang_asm)
+      cpp_error (pfile, "invalid preprocessor directive name");
+
+    return 0;
+  }
+#endif
+  /*
+   * Decode the keyword and call the appropriate expansion
+   * routine, after moving the input pointer up to the next line.
+   */
+  for (kt = directive_table; ; kt++) {
+    if (kt->length <= 0)
+      goto not_a_directive;
+    if (kt->length == ident_length && !strncmp (kt->name, ident, ident_length)) 
+      break;
+  }
+
+  if (! kt->command_reads_line)
+    {
+      /* Nonzero means do not delete comments within the directive.
+         #define needs this when -traditional.  */
+	int comments = CPP_TRADITIONAL (pfile) && kt->traditional_comments; 
+	int save_put_out_comments = CPP_OPTIONS (pfile)->put_out_comments;
+	CPP_OPTIONS (pfile)->put_out_comments = comments;
+	after_ident = CPP_WRITTEN (pfile);
+	copy_rest_of_line (pfile);
+	CPP_OPTIONS (pfile)->put_out_comments = save_put_out_comments;
+    }
+
+  /* For #pragma and #define, we may want to pass through the directive.
+     Other directives may create output, but we don't want the directive
+     itself out, so we pop it now.  For example #include may write a #line
+     command (see comment in do_include), and conditionals may emit
+     #failed ... #endfailed stuff.  But note that popping the buffer
+     means the parameters to kt->func may point after pfile->limit
+     so these parameters are invalid as soon as something gets appended
+     to the token_buffer.  */
+
+  line_end = CPP_PWRITTEN (pfile);
+  if (!kt->pass_thru && kt->type != T_DEFINE)
+    CPP_SET_WRITTEN (pfile, old_written);
+
+  (*kt->func) (pfile, kt, pfile->token_buffer + after_ident, line_end);
+  if (kt->pass_thru
+      || (kt->type == T_DEFINE
+	  && CPP_OPTIONS (pfile)->dump_macros == dump_definitions))
+    {
+      /* Just leave the entire #define in the output stack. */
+    }
+  else if (kt->type == T_DEFINE
+	   && CPP_OPTIONS (pfile)->dump_macros == dump_names)
+    {
+      U_CHAR *p = pfile->token_buffer + old_written + 7;  /* Skip "#define". */
+      SKIP_WHITE_SPACE (p);
+      while (is_idchar[*p]) p++;
+      pfile->limit = p;
+      CPP_PUTC (pfile, '\n');
+    }
+  else if (kt->type == T_DEFINE)
+    CPP_SET_WRITTEN (pfile, old_written);
+ done_a_directive:
+  return 1;
+
+ not_a_directive:
+  return 0;
+}
+
+/* Pass a directive through to the output file.
+   BUF points to the contents of the directive, as a contiguous string.
+   LIMIT points to the first character past the end of the directive.
+   KEYWORD is the keyword-table entry for the directive.  */
+
+static void
+pass_thru_directive (buf, limit, pfile, keyword)
+     U_CHAR *buf, *limit;
+     cpp_reader *pfile;
+     struct directive *keyword;
+{
+  register unsigned keyword_length = keyword->length;
+
+  CPP_RESERVE (pfile, 1 + keyword_length + (limit - buf));
+  CPP_PUTC_Q (pfile, '#');
+  CPP_PUTS_Q (pfile, keyword->name, keyword_length);
+  if (limit != buf && buf[0] != ' ')
+    CPP_PUTC_Q (pfile, ' ');
+  CPP_PUTS_Q (pfile, buf, limit - buf);
+#if 0
+  CPP_PUTS_Q (pfile, '\n');
+  /* Count the line we have just made in the output,
+     to get in sync properly.  */
+  pfile->lineno++;
+#endif
+}
+
+/* The arglist structure is built by do_define to tell
+   collect_definition where the argument names begin.  That
+   is, for a define like "#define f(x,y,z) foo+x-bar*y", the arglist
+   would contain pointers to the strings x, y, and z.
+   Collect_definition would then build a DEFINITION node,
+   with reflist nodes pointing to the places x, y, and z had
+   appeared.  So the arglist is just convenience data passed
+   between these two routines.  It is not kept around after
+   the current #define has been processed and entered into the
+   hash table. */
+
+struct arglist {
+  struct arglist *next;
+  U_CHAR *name;
+  int length;
+  int argno;
+  char rest_args;
+};
+
+/* Read a replacement list for a macro with parameters.
+   Build the DEFINITION structure.
+   Reads characters of text starting at BUF until END.
+   ARGLIST specifies the formal parameters to look for
+   in the text of the definition; NARGS is the number of args
+   in that list, or -1 for a macro name that wants no argument list.
+   MACRONAME is the macro name itself (so we can avoid recursive expansion)
+   and NAMELEN is its length in characters.
+   
+   Note that comments, backslash-newlines, and leading white space
+   have already been deleted from the argument.  */
+
+static DEFINITION *
+collect_expansion (pfile, buf, limit, nargs, arglist)
+     cpp_reader *pfile;
+     U_CHAR *buf, *limit;
+     int nargs;
+     struct arglist *arglist;
+{
+  DEFINITION *defn;
+  register U_CHAR *p, *lastp, *exp_p;
+  struct reflist *endpat = NULL;
+  /* Pointer to first nonspace after last ## seen.  */
+  U_CHAR *concat = 0;
+  /* Pointer to first nonspace after last single-# seen.  */
+  U_CHAR *stringify = 0;
+  int maxsize;
+  int expected_delimiter = '\0';
+
+  /* Scan thru the replacement list, ignoring comments and quoted
+     strings, picking up on the macro calls.  It does a linear search
+     thru the arg list on every potential symbol.  Profiling might say
+     that something smarter should happen. */
+
+  if (limit < buf)
+    abort ();
+
+  /* Find the beginning of the trailing whitespace.  */
+  p = buf;
+  while (p < limit && is_space[limit[-1]]) limit--;
+
+  /* Allocate space for the text in the macro definition.
+     Leading and trailing whitespace chars need 2 bytes each.
+     Each other input char may or may not need 1 byte,
+     so this is an upper bound.  The extra 5 are for invented
+     leading and trailing newline-marker and final null.  */
+  maxsize = (sizeof (DEFINITION)
+	     + (limit - p) + 5);
+  /* Occurrences of '@' get doubled, so allocate extra space for them. */
+  while (p < limit)
+    if (*p++ == '@')
+      maxsize++;
+  defn = (DEFINITION *) xcalloc (1, maxsize);
+
+  defn->nargs = nargs;
+  exp_p = defn->expansion = (U_CHAR *) defn + sizeof (DEFINITION);
+  lastp = exp_p;
+
+  p = buf;
+
+  /* Add one initial space escape-marker to prevent accidental
+     token-pasting (often removed by macroexpand). */
+  *exp_p++ = '@';
+  *exp_p++ = ' ';
+
+  if (limit - p >= 2 && p[0] == '#' && p[1] == '#') {
+    cpp_error (pfile, "`##' at start of macro definition");
+    p += 2;
+  }
+
+  /* Process the main body of the definition.  */
+  while (p < limit) {
+    int skipped_arg = 0;
+    register U_CHAR c = *p++;
+
+    *exp_p++ = c;
+
+    if (!CPP_TRADITIONAL (pfile)) {
+      switch (c) {
+      case '\'':
+      case '\"':
+        if (expected_delimiter != '\0') {
+          if (c == expected_delimiter)
+            expected_delimiter = '\0';
+        } else
+          expected_delimiter = c;
+	break;
+
+      case '\\':
+	if (p < limit && expected_delimiter) {
+	  /* In a string, backslash goes through
+	     and makes next char ordinary.  */
+	  *exp_p++ = *p++;
+	}
+	break;
+
+      case '@':
+	/* An '@' in a string or character constant stands for itself,
+	   and does not need to be escaped. */
+	if (!expected_delimiter)
+	  *exp_p++ = c;
+	break;
+
+      case '#':
+	/* # is ordinary inside a string.  */
+	if (expected_delimiter)
+	  break;
+	if (p < limit && *p == '#') {
+	  /* ##: concatenate preceding and following tokens.  */
+	  /* Take out the first #, discard preceding whitespace.  */
+	  exp_p--;
+	  while (exp_p > lastp && is_hor_space[exp_p[-1]])
+	    --exp_p;
+	  /* Skip the second #.  */
+	  p++;
+	  /* Discard following whitespace.  */
+	  SKIP_WHITE_SPACE (p);
+	  concat = p;
+	  if (p == limit)
+	    cpp_error (pfile, "`##' at end of macro definition");
+	} else if (nargs >= 0) {
+	  /* Single #: stringify following argument ref.
+	     Don't leave the # in the expansion.  */
+	  exp_p--;
+	  SKIP_WHITE_SPACE (p);
+	  if (p == limit || ! is_idstart[*p])
+	    cpp_error (pfile,
+		     "`#' operator is not followed by a macro argument name");
+	  else
+	    stringify = p;
+	}
+	break;
+      }
+    } else {
+      /* In -traditional mode, recognize arguments inside strings and
+	 and character constants, and ignore special properties of #.
+	 Arguments inside strings are considered "stringified", but no
+	 extra quote marks are supplied.  */
+      switch (c) {
+      case '\'':
+      case '\"':
+	if (expected_delimiter != '\0') {
+	  if (c == expected_delimiter)
+	    expected_delimiter = '\0';
+	} else
+	  expected_delimiter = c;
+	break;
+
+      case '\\':
+	/* Backslash quotes delimiters and itself, but not macro args.  */
+	if (expected_delimiter != 0 && p < limit
+	    && (*p == expected_delimiter || *p == '\\')) {
+	  *exp_p++ = *p++;
+	  continue;
+	}
+	break;
+
+      case '/':
+	if (expected_delimiter != '\0') /* No comments inside strings.  */
+	  break;
+	if (*p == '*') {
+	  /* If we find a comment that wasn't removed by handle_directive,
+	     this must be -traditional.  So replace the comment with
+	     nothing at all.  */
+	  exp_p--;
+	  p += 1;
+	  while (p < limit && !(p[-2] == '*' && p[-1] == '/'))
+	    p++;
+#if 0
+	  /* Mark this as a concatenation-point, as if it had been ##.  */
+	  concat = p;
+#endif
+	}
+	break;
+      }
+    }
+
+    /* Handle the start of a symbol.  */
+    if (is_idchar[c] && nargs > 0) {
+      U_CHAR *id_beg = p - 1;
+      int id_len;
+
+      --exp_p;
+      while (p != limit && is_idchar[*p]) p++;
+      id_len = p - id_beg;
+
+      if (is_idstart[c]) {
+	register struct arglist *arg;
+
+	for (arg = arglist; arg != NULL; arg = arg->next) {
+	  struct reflist *tpat;
+
+	  if (arg->name[0] == c
+	      && arg->length == id_len
+	      && strncmp (arg->name, id_beg, id_len) == 0) {
+	    if (expected_delimiter && CPP_OPTIONS (pfile)->warn_stringify) {
+	      if (CPP_TRADITIONAL (pfile)) {
+		cpp_warning (pfile, "macro argument `%.*s' is stringified.",
+			     id_len, arg->name);
+	      } else {
+		cpp_warning (pfile,
+		    "macro arg `%.*s' would be stringified with -traditional.",
+			     id_len, arg->name);
+	      }
+	    }
+	    /* If ANSI, don't actually substitute inside a string.  */
+	    if (!CPP_TRADITIONAL (pfile) && expected_delimiter)
+	      break;
+	    /* make a pat node for this arg and append it to the end of
+	       the pat list */
+	    tpat = (struct reflist *) xmalloc (sizeof (struct reflist));
+	    tpat->next = NULL;
+	    tpat->raw_before = concat == id_beg;
+	    tpat->raw_after = 0;
+	    tpat->rest_args = arg->rest_args;
+	    tpat->stringify = (CPP_TRADITIONAL (pfile)
+			       ? expected_delimiter != '\0'
+			       : stringify == id_beg);
+
+	    if (endpat == NULL)
+	      defn->pattern = tpat;
+	    else
+	      endpat->next = tpat;
+	    endpat = tpat;
+
+	    tpat->argno = arg->argno;
+	    tpat->nchars = exp_p - lastp;
+	    {
+	      register U_CHAR *p1 = p;
+	      SKIP_WHITE_SPACE (p1);
+	      if (p1 + 2 <= limit && p1[0] == '#' && p1[1] == '#')
+		tpat->raw_after = 1;
+	    }
+	    lastp = exp_p;	/* place to start copying from next time */
+	    skipped_arg = 1;
+	    break;
+	  }
+	}
+      }
+
+      /* If this was not a macro arg, copy it into the expansion.  */
+      if (! skipped_arg) {
+	register U_CHAR *lim1 = p;
+	p = id_beg;
+	while (p != lim1)
+	  *exp_p++ = *p++;
+	if (stringify == id_beg)
+	  cpp_error (pfile,
+		   "`#' operator should be followed by a macro argument name");
+      }
+    }
+  }
+
+  if (!CPP_TRADITIONAL (pfile) && expected_delimiter == 0)
+    {
+      /* If ANSI, put in a "@ " marker to prevent token pasting.
+         But not if "inside a string" (which in ANSI mode
+         happens only for -D option).  */
+      *exp_p++ = '@';
+      *exp_p++ = ' ';
+    }
+
+  *exp_p = '\0';
+
+  defn->length = exp_p - defn->expansion;
+
+  /* Crash now if we overrun the allocated size.  */
+  if (defn->length + 1 > maxsize)
+    abort ();
+
+#if 0
+/* This isn't worth the time it takes.  */
+  /* give back excess storage */
+  defn->expansion = (U_CHAR *) xrealloc (defn->expansion, defn->length + 1);
+#endif
+
+  return defn;
+}
+
+/*
+ * special extension string that can be added to the last macro argument to 
+ * allow it to absorb the "rest" of the arguments when expanded.  Ex:
+ * 		#define wow(a, b...)		process (b, a, b)
+ *		{ wow (1, 2, 3); }	->	{ process (2, 3, 1, 2, 3); }
+ *		{ wow (one, two); }	->	{ process (two, one, two); }
+ * if this "rest_arg" is used with the concat token '##' and if it is not
+ * supplied then the token attached to with ## will not be outputted.  Ex:
+ * 		#define wow (a, b...)		process (b ## , a, ## b)
+ *		{ wow (1, 2); }		->	{ process (2, 1, 2); }
+ *		{ wow (one); }		->	{ process (one); {
+ */
+static char rest_extension[] = "...";
+#define REST_EXTENSION_LENGTH	(sizeof (rest_extension) - 1)
+
+/* Create a DEFINITION node from a #define directive.  Arguments are 
+   as for do_define. */
+static MACRODEF
+create_definition (buf, limit, pfile, predefinition)
+     U_CHAR *buf, *limit;
+     cpp_reader *pfile;
+     int predefinition;
+{
+  U_CHAR *bp;			/* temp ptr into input buffer */
+  U_CHAR *symname;		/* remember where symbol name starts */
+  int sym_length;		/* and how long it is */
+  int rest_args = 0;
+  long line, col;
+  char *file = CPP_BUFFER (pfile) ? CPP_BUFFER (pfile)->nominal_fname : "";
+  DEFINITION *defn;
+  int arglengths = 0;		/* Accumulate lengths of arg names
+				   plus number of args.  */
+  MACRODEF mdef;
+  cpp_buf_line_and_col (CPP_BUFFER (pfile), &line, &col);
+
+  bp = buf;
+
+  while (is_hor_space[*bp])
+    bp++;
+
+  symname = bp;			/* remember where it starts */
+
+  sym_length = check_macro_name (pfile, bp, "macro");
+  bp += sym_length;
+
+  /* Lossage will occur if identifiers or control keywords are broken
+     across lines using backslash.  This is not the right place to take
+     care of that. */
+
+  if (*bp == '(') {
+    struct arglist *arg_ptrs = NULL;
+    int argno = 0;
+
+    bp++;			/* skip '(' */
+    SKIP_WHITE_SPACE (bp);
+
+    /* Loop over macro argument names.  */
+    while (*bp != ')') {
+      struct arglist *temp;
+
+      temp = (struct arglist *) alloca (sizeof (struct arglist));
+      temp->name = bp;
+      temp->next = arg_ptrs;
+      temp->argno = argno++;
+      temp->rest_args = 0;
+      arg_ptrs = temp;
+
+      if (rest_args)
+	cpp_pedwarn (pfile, "another parameter follows `%s'", rest_extension);
+
+      if (!is_idstart[*bp])
+	cpp_pedwarn (pfile, "invalid character in macro parameter name");
+      
+      /* Find the end of the arg name.  */
+      while (is_idchar[*bp]) {
+	bp++;
+	/* do we have a "special" rest-args extension here? */
+	if (limit - bp > REST_EXTENSION_LENGTH &&
+	    strncmp (rest_extension, bp, REST_EXTENSION_LENGTH) == 0) {
+	  rest_args = 1;
+	  temp->rest_args = 1;
+	  break;
+	}
+      }
+      temp->length = bp - temp->name;
+      if (rest_args == 1)
+	bp += REST_EXTENSION_LENGTH;
+      arglengths += temp->length + 2;
+      SKIP_WHITE_SPACE (bp);
+      if (temp->length == 0 || (*bp != ',' && *bp != ')')) {
+	cpp_error (pfile, "badly punctuated parameter list in `#define'");
+	goto nope;
+      }
+      if (*bp == ',') {
+	bp++;
+	SKIP_WHITE_SPACE (bp);
+      }
+      if (bp >= limit) {
+	cpp_error (pfile, "unterminated parameter list in `#define'");
+	goto nope;
+      }
+      {
+	struct arglist *otemp;
+
+	for (otemp = temp->next; otemp != NULL; otemp = otemp->next)
+	  if (temp->length == otemp->length &&
+	    strncmp (temp->name, otemp->name, temp->length) == 0) {
+	      U_CHAR *name;
+
+	      name = (U_CHAR *) alloca (temp->length + 1);
+	      (void) strncpy (name, temp->name, temp->length);
+	      name[temp->length] = '\0';
+	      cpp_error (pfile,
+			 "duplicate argument name `%s' in `#define'", name);
+	      goto nope;
+	  }
+      }
+    }
+
+    ++bp;			/* skip paren */
+    SKIP_WHITE_SPACE (bp);
+    /* now everything from bp before limit is the definition. */
+    defn = collect_expansion (pfile, bp, limit, argno, arg_ptrs);
+    defn->rest_args = rest_args;
+
+    /* Now set defn->args.argnames to the result of concatenating
+       the argument names in reverse order
+       with comma-space between them.  */
+    defn->args.argnames = (U_CHAR *) xmalloc (arglengths + 1);
+    {
+      struct arglist *temp;
+      int i = 0;
+      for (temp = arg_ptrs; temp; temp = temp->next) {
+	bcopy (temp->name, &defn->args.argnames[i], temp->length);
+	i += temp->length;
+	if (temp->next != 0) {
+	  defn->args.argnames[i++] = ',';
+	  defn->args.argnames[i++] = ' ';
+	}
+      }
+      defn->args.argnames[i] = 0;
+    }
+  } else {
+    /* Simple expansion or empty definition.  */
+
+    if (bp < limit)
+      {
+	if (is_hor_space[*bp]) {
+	  bp++;
+	  SKIP_WHITE_SPACE (bp);
+	} else {
+	  switch (*bp) {
+	    case '!':  case '"':  case '#':  case '%':  case '&':  case '\'':
+	    case ')':  case '*':  case '+':  case ',':  case '-':  case '.':
+	    case '/':  case ':':  case ';':  case '<':  case '=':  case '>':
+	    case '?':  case '[':  case '\\': case ']':  case '^':  case '{':
+	    case '|':  case '}':  case '~':
+	      cpp_warning (pfile, "missing white space after `#define %.*s'",
+			   sym_length, symname);
+	      break;
+
+	    default:
+	      cpp_pedwarn (pfile, "missing white space after `#define %.*s'",
+			   sym_length, symname);
+	      break;
+	  }
+	}
+      }
+    /* now everything from bp before limit is the definition. */
+    defn = collect_expansion (pfile, bp, limit, -1, NULL_PTR);
+    defn->args.argnames = (U_CHAR *) "";
+  }
+
+  defn->line = line;
+  defn->file = file;
+
+  /* OP is null if this is a predefinition */
+  defn->predefined = predefinition;
+  mdef.defn = defn;
+  mdef.symnam = symname;
+  mdef.symlen = sym_length;
+
+  return mdef;
+
+ nope:
+  mdef.defn = 0;
+  return mdef;
+}
+
+/* Check a purported macro name SYMNAME, and yield its length.
+   USAGE is the kind of name this is intended for.  */
+
+static int
+check_macro_name (pfile, symname, usage)
+     cpp_reader *pfile;
+     U_CHAR *symname;
+     char *usage;
+{
+  U_CHAR *p;
+  int sym_length;
+
+  for (p = symname; is_idchar[*p]; p++)
+    ;
+  sym_length = p - symname;
+  if (sym_length == 0)
+    cpp_error (pfile, "invalid %s name", usage);
+  else if (!is_idstart[*symname]) {
+    U_CHAR *msg;			/* what pain... */
+    msg = (U_CHAR *) alloca (sym_length + 1);
+    bcopy (symname, msg, sym_length);
+    msg[sym_length] = 0;
+    cpp_error (pfile, "invalid %s name `%s'", usage, msg);
+  } else {
+    if (! strncmp (symname, "defined", 7) && sym_length == 7)
+      cpp_error (pfile, "invalid %s name `defined'", usage);
+  }
+  return sym_length;
+}
+
+/*
+ * return zero if two DEFINITIONs are isomorphic
+ */
+static int
+compare_defs (d1, d2)
+     DEFINITION *d1, *d2;
+{
+  register struct reflist *a1, *a2;
+  register U_CHAR *p1 = d1->expansion;
+  register U_CHAR *p2 = d2->expansion;
+  int first = 1;
+
+  if (d1->nargs != d2->nargs)
+    return 1;
+  if (strcmp ((char *)d1->args.argnames, (char *)d2->args.argnames))
+    return 1;
+  for (a1 = d1->pattern, a2 = d2->pattern; a1 && a2;
+       a1 = a1->next, a2 = a2->next) {
+    if (!((a1->nchars == a2->nchars && ! strncmp (p1, p2, a1->nchars))
+	  || ! comp_def_part (first, p1, a1->nchars, p2, a2->nchars, 0))
+	|| a1->argno != a2->argno
+	|| a1->stringify != a2->stringify
+	|| a1->raw_before != a2->raw_before
+	|| a1->raw_after != a2->raw_after)
+      return 1;
+    first = 0;
+    p1 += a1->nchars;
+    p2 += a2->nchars;
+  }
+  if (a1 != a2)
+    return 1;
+  if (comp_def_part (first, p1, d1->length - (p1 - d1->expansion),
+		     p2, d2->length - (p2 - d2->expansion), 1))
+    return 1;
+  return 0;
+}
+
+/* Return 1 if two parts of two macro definitions are effectively different.
+   One of the parts starts at BEG1 and has LEN1 chars;
+   the other has LEN2 chars at BEG2.
+   Any sequence of whitespace matches any other sequence of whitespace.
+   FIRST means these parts are the first of a macro definition;
+    so ignore leading whitespace entirely.
+   LAST means these parts are the last of a macro definition;
+    so ignore trailing whitespace entirely.  */
+
+static int
+comp_def_part (first, beg1, len1, beg2, len2, last)
+     int first;
+     U_CHAR *beg1, *beg2;
+     int len1, len2;
+     int last;
+{
+  register U_CHAR *end1 = beg1 + len1;
+  register U_CHAR *end2 = beg2 + len2;
+  if (first) {
+    while (beg1 != end1 && is_space[*beg1]) beg1++;
+    while (beg2 != end2 && is_space[*beg2]) beg2++;
+  }
+  if (last) {
+    while (beg1 != end1 && is_space[end1[-1]]) end1--;
+    while (beg2 != end2 && is_space[end2[-1]]) end2--;
+  }
+  while (beg1 != end1 && beg2 != end2) {
+    if (is_space[*beg1] && is_space[*beg2]) {
+      while (beg1 != end1 && is_space[*beg1]) beg1++;
+      while (beg2 != end2 && is_space[*beg2]) beg2++;
+    } else if (*beg1 == *beg2) {
+      beg1++; beg2++;
+    } else break;
+  }
+  return (beg1 != end1) || (beg2 != end2);
+}
+
+/* Process a #define command.
+BUF points to the contents of the #define command, as a contiguous string.
+LIMIT points to the first character past the end of the definition.
+KEYWORD is the keyword-table entry for #define,
+or NULL for a "predefined" macro.  */
+
+static int
+do_define (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  int hashcode;
+  MACRODEF mdef;
+  HASHNODE *hp;
+
+#if 0
+  /* If this is a precompiler run (with -pcp) pass thru #define commands.  */
+  if (pcp_outfile && keyword)
+    pass_thru_directive (buf, limit, pfile, keyword);
+#endif
+
+  mdef = create_definition (buf, limit, pfile, keyword == NULL);
+  if (mdef.defn == 0)
+    goto nope;
+
+  hashcode = hashf (mdef.symnam, mdef.symlen, HASHSIZE);
+
+  if ((hp = cpp_lookup (pfile, mdef.symnam, mdef.symlen, hashcode)) != NULL)
+    {
+      int ok = 0;
+      /* Redefining a precompiled key is ok.  */
+      if (hp->type == T_PCSTRING)
+	ok = 1;
+      /* Redefining a macro is ok if the definitions are the same.  */
+      else if (hp->type == T_MACRO)
+	ok = ! compare_defs (mdef.defn, hp->value.defn);
+      /* Redefining a constant is ok with -D.  */
+      else if (hp->type == T_CONST)
+        ok = ! CPP_OPTIONS (pfile)->done_initializing;
+      /* Print the warning if it's not ok.  */
+      if (!ok)
+	{
+	  U_CHAR *msg;		/* what pain... */
+
+	  /* If we are passing through #define and #undef directives, do
+	     that for this re-definition now.  */
+	  if (CPP_OPTIONS (pfile)->debug_output && keyword)
+	    pass_thru_directive (buf, limit, pfile, keyword);
+
+	  msg = (U_CHAR *) alloca (mdef.symlen + 22);
+	  *msg = '`';
+	  bcopy (mdef.symnam, msg + 1, mdef.symlen);
+	  strcpy ((char *) (msg + mdef.symlen + 1), "' redefined");
+	  cpp_pedwarn (pfile, msg);
+	  if (hp->type == T_MACRO)
+	    cpp_pedwarn_with_file_and_line (pfile, hp->value.defn->file, hp->value.defn->line,
+				      "this is the location of the previous definition");
+	}
+      /* Replace the old definition.  */
+      hp->type = T_MACRO;
+      hp->value.defn = mdef.defn;
+    }
+  else
+    {
+      /* If we are passing through #define and #undef directives, do
+	 that for this new definition now.  */
+      if (CPP_OPTIONS (pfile)->debug_output && keyword)
+	pass_thru_directive (buf, limit, pfile, keyword);
+      install (mdef.symnam, mdef.symlen, T_MACRO, 0,
+	       (char *) mdef.defn, hashcode);
+    }
+
+  return 0;
+
+nope:
+
+  return 1;
+}
+
+/* This structure represents one parsed argument in a macro call.
+   `raw' points to the argument text as written (`raw_length' is its length).
+   `expanded' points to the argument's macro-expansion
+   (its length is `expand_length').
+   `stringified_length' is the length the argument would have
+   if stringified.
+   `use_count' is the number of times this macro arg is substituted
+   into the macro.  If the actual use count exceeds 10, 
+   the value stored is 10. */
+
+/* raw and expanded are relative to ARG_BASE */
+#define ARG_BASE ((pfile)->token_buffer)
+
+struct argdata {
+  /* Strings relative to pfile->token_buffer */
+  long raw, expanded, stringified;
+  int raw_length, expand_length;
+  int stringified_length;
+  char newlines;
+  char use_count;
+};
+
+
+cpp_buffer*
+cpp_push_buffer (pfile, buffer, length)
+     cpp_reader *pfile;
+     U_CHAR *buffer;
+     long length;
+{
+#ifdef STATIC_BUFFERS
+  register cpp_buffer *buf = CPP_BUFFER (pfile);
+  if (buf == pfile->buffer_stack)
+    fatal ("%s: macro or `#include' recursion too deep", buf->fname);
+  buf--;
+  bzero ((char *) buf, sizeof (cpp_buffer));
+  CPP_BUFFER (pfile) = buf;
+#else
+  register cpp_buffer *buf = (cpp_buffer*) xmalloc (sizeof(cpp_buffer));
+  bzero ((char *) buf, sizeof (cpp_buffer));
+  CPP_PREV_BUFFER (buf) = CPP_BUFFER (pfile);
+  CPP_BUFFER (pfile) = buf;
+#endif
+  buf->if_stack = pfile->if_stack;
+  buf->cleanup = null_cleanup;
+  buf->underflow = null_underflow;
+  buf->buf = buf->cur = buffer;
+  buf->alimit = buf->rlimit = buffer + length;
+  
+  return buf;
+}
+
+cpp_buffer*
+cpp_pop_buffer (pfile)
+     cpp_reader *pfile;
+{
+  cpp_buffer *buf = CPP_BUFFER (pfile);
+#ifdef STATIC_BUFFERS
+  (*buf->cleanup) (buf, pfile);
+  return ++CPP_BUFFER (pfile);
+#else
+  cpp_buffer *next_buf = CPP_PREV_BUFFER (buf);
+  (*buf->cleanup) (buf, pfile);
+  CPP_BUFFER (pfile) = next_buf;
+  free (buf);
+  return next_buf;
+#endif
+}
+
+/* Scan until CPP_BUFFER (PFILE) is exhausted into PFILE->token_buffer.
+   Pop the buffer when done. */
+
+void
+cpp_scan_buffer (pfile)
+     cpp_reader *pfile;
+{
+  cpp_buffer *buffer = CPP_BUFFER (pfile);
+  for (;;)
+    {
+      enum cpp_token token = cpp_get_token (pfile);
+      if (token == CPP_EOF) /* Should not happen ... */
+	break;
+      if (token == CPP_POP && CPP_BUFFER (pfile) == buffer)
+	{
+	  cpp_pop_buffer (pfile);
+	  break;
+	}
+    }
+}
+
+/*
+ * Rescan a string (which may have escape marks) into pfile's buffer.
+ * Place the result in pfile->token_buffer.
+ *
+ * The input is copied before it is scanned, so it is safe to pass
+ * it something from the token_buffer that will get overwritten
+ * (because it follows CPP_WRITTEN).  This is used by do_include.
+ */
+
+static void
+cpp_expand_to_buffer (pfile, buf, length)
+     cpp_reader *pfile;
+     U_CHAR *buf;
+     int length;
+{
+  register cpp_buffer *ip;
+  cpp_buffer obuf;
+  U_CHAR *limit = buf + length;
+  U_CHAR *buf1;
+#if 0
+  int odepth = indepth;
+#endif
+
+  if (length < 0)
+    abort ();
+
+  /* Set up the input on the input stack.  */
+
+  buf1 = (U_CHAR *) alloca (length + 1);
+  {
+    register U_CHAR *p1 = buf;
+    register U_CHAR *p2 = buf1;
+
+    while (p1 != limit)
+      *p2++ = *p1++;
+  }
+  buf1[length] = 0;
+
+  ip = cpp_push_buffer (pfile, buf1, length);
+  ip->has_escapes = 1;
+#if 0
+  ip->lineno = obuf.lineno = 1;
+#endif
+
+  /* Scan the input, create the output.  */
+  cpp_scan_buffer (pfile);
+
+#if 0
+  if (indepth != odepth)
+    abort ();
+#endif
+
+  CPP_NUL_TERMINATE (pfile);
+}
+
+
+static void
+adjust_position (buf, limit, linep, colp)
+     U_CHAR *buf;
+     U_CHAR *limit;
+     long *linep;
+     long *colp;
+{
+  while (buf < limit)
+    {
+      U_CHAR ch = *buf++;
+      if (ch == '\n')
+	(*linep)++, (*colp) = 1;
+      else
+	(*colp)++;
+    }
+}
+
+/* Move line_base forward, updating lineno and colno. */
+
+static void
+update_position (pbuf)
+     register cpp_buffer *pbuf;
+{
+  unsigned char *old_pos = pbuf->buf + pbuf->line_base;
+  unsigned char *new_pos = pbuf->cur;
+  register struct parse_marker *mark;
+  for (mark = pbuf->marks;  mark != NULL; mark = mark->next)
+    {
+      if (pbuf->buf + mark->position < new_pos)
+	new_pos = pbuf->buf + mark->position;
+    }
+  pbuf->line_base += new_pos - old_pos;
+  adjust_position (old_pos, new_pos, &pbuf->lineno, &pbuf->colno);
+}
+
+void
+cpp_buf_line_and_col (pbuf, linep, colp)
+     register cpp_buffer *pbuf;
+     long *linep, *colp;
+{
+  long dummy;
+  if (colp == NULL)
+    colp = &dummy;
+  if (pbuf)
+    {
+      *linep = pbuf->lineno;
+      *colp = pbuf->colno;
+      adjust_position (pbuf->buf + pbuf->line_base, pbuf->cur, linep, colp);
+    }
+  else
+    {
+      *linep = 0;
+      *colp = 0;
+    }
+}
+
+/* Return the cpp_buffer that corresponds to a file (not a macro). */
+
+cpp_buffer*
+cpp_file_buffer (pfile)
+     cpp_reader *pfile;
+{
+  cpp_buffer *ip = CPP_BUFFER (pfile);
+
+  for ( ; ip != CPP_NULL_BUFFER (pfile); ip = CPP_PREV_BUFFER (ip))
+    if (ip->fname != NULL)
+      return ip;
+  return NULL;
+}
+
+static long
+count_newlines (buf, limit)
+     register U_CHAR *buf;
+     register U_CHAR *limit;
+{
+  register long count = 0;
+  while (buf < limit)
+    {
+      U_CHAR ch = *buf++;
+      if (ch == '\n')
+	count++;
+    }
+  return count;
+}
+
+/*
+ * write out a #line command, for instance, after an #include file.
+ * If CONDITIONAL is nonzero, we can omit the #line if it would
+ * appear to be a no-op, and we can output a few newlines instead
+ * if we want to increase the line number by a small amount.
+ * FILE_CHANGE says whether we are entering a file, leaving, or neither.
+ */
+
+static void
+output_line_command (pfile, conditional, file_change)
+     cpp_reader *pfile;
+     int conditional;
+     enum file_change_code file_change;
+{
+  int len;
+  char *line_cmd_buf, *line_end;
+  long line, col;
+  cpp_buffer *ip = CPP_BUFFER (pfile);
+
+  if (ip->fname == NULL || CPP_OPTIONS (pfile)->no_output) {
+    return;
+  }
+
+  update_position (ip);
+  line = CPP_BUFFER (pfile)->lineno;
+  col = CPP_BUFFER (pfile)->colno;
+  adjust_position (CPP_LINE_BASE (ip), ip->cur, &line, &col);
+
+  if (CPP_OPTIONS (pfile)->no_line_commands)
+    return;
+
+  if (conditional) {
+    if (line == pfile->lineno)
+      return;
+
+    /* If the inherited line number is a little too small,
+       output some newlines instead of a #line command.  */
+    if (line > pfile->lineno && line < pfile->lineno + 8) {
+      CPP_RESERVE (pfile, 20);
+      while (line > pfile->lineno) {
+	CPP_PUTC_Q (pfile, '\n');
+	pfile->lineno++;
+      }
+      return;
+    }
+  }
+
+#if 0
+  /* Don't output a line number of 0 if we can help it.  */
+  if (ip->lineno == 0 && ip->bufp - ip->buf < ip->length
+      && *ip->bufp == '\n') {
+    ip->lineno++;
+    ip->bufp++;
+  }
+#endif
+
+  CPP_RESERVE (pfile, 4 * strlen (ip->nominal_fname) + 50);
+  {
+#ifdef OUTPUT_LINE_COMMANDS
+    static char sharp_line[] = "#line ";
+#else
+    static char sharp_line[] = "# ";
+#endif
+    CPP_PUTS_Q (pfile, sharp_line, sizeof(sharp_line)-1);
+  }
+
+  sprintf (CPP_PWRITTEN (pfile), "%d ", line);
+  CPP_ADJUST_WRITTEN (pfile, strlen (CPP_PWRITTEN (pfile)));
+
+  quote_string (pfile, ip->nominal_fname); 
+  if (file_change != same_file) {
+    CPP_PUTC_Q (pfile, ' ');
+    CPP_PUTC_Q (pfile, file_change == enter_file ? '1' : '2');
+  }
+  /* Tell cc1 if following text comes from a system header file.  */
+  if (ip->system_header_p) {
+    CPP_PUTC_Q (pfile, ' ');
+    CPP_PUTC_Q (pfile, '3');
+  }
+#ifndef NO_IMPLICIT_EXTERN_C
+  /* Tell cc1plus if following text should be treated as C.  */
+  if (ip->system_header_p == 2 && CPP_OPTIONS (pfile)->cplusplus) {
+    CPP_PUTC_Q (pfile, ' ');
+    CPP_PUTC_Q (pfile, '4');
+  }
+#endif
+  CPP_PUTC_Q (pfile, '\n');
+  pfile->lineno = line;
+}
+
+/*
+ * Parse a macro argument and append the info on PFILE's token_buffer.
+ * REST_ARGS means to absorb the rest of the args.
+ * Return nonzero to indicate a syntax error.
+ */
+
+static enum cpp_token
+macarg (pfile, rest_args)
+     cpp_reader *pfile;
+     int rest_args;
+{
+  int paren = 0;
+  enum cpp_token token;
+  long arg_start = CPP_WRITTEN (pfile);
+  char save_put_out_comments = CPP_OPTIONS (pfile)->put_out_comments;
+  CPP_OPTIONS (pfile)->put_out_comments = 0;
+
+  /* Try to parse as much of the argument as exists at this
+     input stack level.  */
+  pfile->no_macro_expand++;
+  for (;;)
+    {
+      token = cpp_get_token (pfile);
+      switch (token)
+	{
+	case CPP_EOF:
+	  goto done;
+	case CPP_POP:
+	  /* If we've hit end of file, it's an error (reported by caller).
+	     Ditto if it's the end of cpp_expand_to_buffer text.
+	     If we've hit end of macro, just continue.  */
+	  if (! CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
+	    goto done;
+	  break;
+	case CPP_LPAREN:
+	  paren++;
+	  break;
+	case CPP_RPAREN:
+	  if (--paren < 0)
+	    goto found;
+	  break;
+	case CPP_COMMA:
+	  /* if we've returned to lowest level and
+	     we aren't absorbing all args */
+	  if (paren == 0 && rest_args == 0)
+	    goto found;
+	  break;
+	found:
+	  /* Remove ',' or ')' from argument buffer. */
+	  CPP_ADJUST_WRITTEN (pfile, -1);
+	  goto done;
+      default: ;
+	}
+    }
+
+ done:
+  CPP_OPTIONS (pfile)->put_out_comments = save_put_out_comments;
+  pfile->no_macro_expand--;
+
+  return token;
+}
+
+/* Turn newlines to spaces in the string of length LENGTH at START,
+   except inside of string constants.
+   The string is copied into itself with its beginning staying fixed.  */
+
+static int
+change_newlines (start, length)
+     U_CHAR *start;
+     int length;
+{
+  register U_CHAR *ibp;
+  register U_CHAR *obp;
+  register U_CHAR *limit;
+  register int c;
+
+  ibp = start;
+  limit = start + length;
+  obp = start;
+
+  while (ibp < limit) {
+    *obp++ = c = *ibp++;
+    switch (c) {
+
+    case '\'':
+    case '\"':
+      /* Notice and skip strings, so that we don't delete newlines in them.  */
+      {
+	int quotec = c;
+	while (ibp < limit) {
+	  *obp++ = c = *ibp++;
+	  if (c == quotec)
+	    break;
+	  if (c == '\n' && quotec == '\'')
+	    break;
+	}
+      }
+      break;
+    }
+  }
+
+  return obp - start;
+}
+
+
+static struct tm *
+timestamp (pfile)
+     cpp_reader *pfile;
+{
+  if (!pfile->timebuf) {
+    time_t t = time ((time_t *)0);
+    pfile->timebuf = localtime (&t);
+  }
+  return pfile->timebuf;
+}
+
+static char *monthnames[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+			     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+			    };
+
+/*
+ * expand things like __FILE__.  Place the expansion into the output
+ * buffer *without* rescanning.
+ */
+
+static void
+special_symbol (hp, pfile)
+     HASHNODE *hp;
+     cpp_reader *pfile;
+{
+  char *buf;
+  int i, len;
+  int true_indepth;
+  cpp_buffer *ip = NULL;
+  struct tm *timebuf;
+
+  int paren = 0;		/* For special `defined' keyword */
+
+#if 0
+  if (pcp_outfile && pcp_inside_if
+      && hp->type != T_SPEC_DEFINED && hp->type != T_CONST)
+    cpp_error (pfile,
+	       "Predefined macro `%s' used inside `#if' during precompilation",
+	       hp->name);
+#endif
+    
+  for (ip = CPP_BUFFER (pfile); ; ip = CPP_PREV_BUFFER (ip))
+    {
+      if (ip == NULL)
+	{
+	  cpp_error (pfile, "cccp error: not in any file?!");
+	  return;			/* the show must go on */
+	}
+      if (ip->fname != NULL)
+	break;
+    }
+
+  switch (hp->type)
+    {
+    case T_FILE:
+    case T_BASE_FILE:
+      {
+	char *string;
+	if (hp->type == T_BASE_FILE)
+	  {
+	    while (CPP_PREV_BUFFER (ip))
+	      ip = CPP_PREV_BUFFER (ip);
+	  }
+	string = ip->nominal_fname;
+
+	if (!string)
+	  string = "";
+	CPP_RESERVE (pfile, 3 + 4 * strlen (string));
+	quote_string (pfile, string);
+	return;
+      }
+
+    case T_INCLUDE_LEVEL:
+      true_indepth = 0;
+      for (ip = CPP_BUFFER (pfile);  ip != NULL; ip = CPP_PREV_BUFFER (ip))
+	if (ip->fname != NULL)
+	  true_indepth++;
+
+      buf = (char *) alloca (8); /* Eight bytes ought to be more than enough */
+      sprintf (buf, "%d", true_indepth - 1);
+      break;
+
+  case T_VERSION:
+      buf = (char *) alloca (3 + strlen (version_string));
+      sprintf (buf, "\"%s\"", version_string);
+      break;
+
+#ifndef NO_BUILTIN_SIZE_TYPE
+    case T_SIZE_TYPE:
+      buf = SIZE_TYPE;
+      break;
+#endif
+
+#ifndef NO_BUILTIN_PTRDIFF_TYPE
+    case T_PTRDIFF_TYPE:
+      buf = PTRDIFF_TYPE;
+      break;
+#endif
+
+    case T_WCHAR_TYPE:
+      buf = CPP_WCHAR_TYPE (pfile);
+    break;
+
+    case T_USER_LABEL_PREFIX_TYPE:
+      buf = USER_LABEL_PREFIX;
+      break;
+
+    case T_REGISTER_PREFIX_TYPE:
+      buf = REGISTER_PREFIX;
+      break;
+
+  case T_CONST:
+      buf = (char *) alloca (4 * sizeof (int));
+      sprintf (buf, "%d", hp->value.ival);
+#if 0
+      if (pcp_inside_if && pcp_outfile)
+	/* Output a precondition for this macro use */
+	fprintf (pcp_outfile, "#define %s %d\n", hp->name, hp->value.ival);
+#endif
+      break;
+
+    case T_SPECLINE:
+      {
+	long line = ip->lineno;
+	long col = ip->colno;
+	adjust_position (CPP_LINE_BASE (ip), ip->cur, &line, &col);
+
+	buf = (char *) alloca (10);
+	sprintf (buf, "%d", line);
+      }
+      break;
+
+    case T_DATE:
+    case T_TIME:
+      buf = (char *) alloca (20);
+      timebuf = timestamp (pfile);
+      if (hp->type == T_DATE)
+	sprintf (buf, "\"%s %2d %4d\"", monthnames[timebuf->tm_mon],
+		 timebuf->tm_mday, timebuf->tm_year + 1900);
+      else
+	sprintf (buf, "\"%02d:%02d:%02d\"", timebuf->tm_hour, timebuf->tm_min,
+		 timebuf->tm_sec);
+      break;
+
+    case T_SPEC_DEFINED:
+      buf = " 0 ";		/* Assume symbol is not defined */
+      ip = CPP_BUFFER (pfile);
+      SKIP_WHITE_SPACE (ip->cur);
+      if (*ip->cur == '(')
+	{
+	  paren++;
+	  ip->cur++;			/* Skip over the paren */
+	  SKIP_WHITE_SPACE (ip->cur);
+	}
+
+      if (!is_idstart[*ip->cur])
+	goto oops;
+      if (hp = cpp_lookup (pfile, ip->cur, -1, -1))
+	{
+#if 0
+	  if (pcp_outfile && pcp_inside_if
+	      && (hp->type == T_CONST
+		  || (hp->type == T_MACRO && hp->value.defn->predefined)))
+	    /* Output a precondition for this macro use. */
+	    fprintf (pcp_outfile, "#define %s\n", hp->name);
+#endif
+	  buf = " 1 ";
+	}
+#if 0
+      else
+	if (pcp_outfile && pcp_inside_if)
+	  {
+	    /* Output a precondition for this macro use */
+	    U_CHAR *cp = ip->bufp;
+	    fprintf (pcp_outfile, "#undef ");
+	    while (is_idchar[*cp]) /* Ick! */
+	      fputc (*cp++, pcp_outfile);
+	    putc ('\n', pcp_outfile);
+	  }
+#endif
+      while (is_idchar[*ip->cur])
+	++ip->cur;
+      SKIP_WHITE_SPACE (ip->cur);
+      if (paren)
+	{
+	  if (*ip->cur != ')')
+	    goto oops;
+	  ++ip->cur;
+	}
+      break;
+
+    oops:
+
+      cpp_error (pfile, "`defined' without an identifier");
+      break;
+
+    default:
+      cpp_error (pfile, "cccp error: invalid special hash type"); /* time for gdb */
+      abort ();
+    }
+  len = strlen (buf);
+  CPP_RESERVE (pfile, len + 1);
+  CPP_PUTS_Q (pfile, buf, len);
+  CPP_NUL_TERMINATE_Q (pfile);
+
+  return;
+}
+
+/* Initialize the built-in macros.  */
+
+static void
+initialize_builtins (pfile)
+     cpp_reader *pfile;
+{
+  install ("__LINE__", -1, T_SPECLINE, 0, 0, -1);
+  install ("__DATE__", -1, T_DATE, 0, 0, -1);
+  install ("__FILE__", -1, T_FILE, 0, 0, -1);
+  install ("__BASE_FILE__", -1, T_BASE_FILE, 0, 0, -1);
+  install ("__INCLUDE_LEVEL__", -1, T_INCLUDE_LEVEL, 0, 0, -1);
+  install ("__VERSION__", -1, T_VERSION, 0, 0, -1);
+#ifndef NO_BUILTIN_SIZE_TYPE
+  install ("__SIZE_TYPE__", -1, T_SIZE_TYPE, 0, 0, -1);
+#endif
+#ifndef NO_BUILTIN_PTRDIFF_TYPE
+  install ("__PTRDIFF_TYPE__ ", -1, T_PTRDIFF_TYPE, 0, 0, -1);
+#endif
+  install ("__WCHAR_TYPE__", -1, T_WCHAR_TYPE, 0, 0, -1);
+  install ("__USER_LABEL_PREFIX__", -1, T_USER_LABEL_PREFIX_TYPE, 0, 0, -1);
+  install ("__REGISTER_PREFIX__", -1, T_REGISTER_PREFIX_TYPE, 0, 0, -1);
+  install ("__TIME__", -1, T_TIME, 0, 0, -1);
+  if (!CPP_TRADITIONAL (pfile))
+    install ("__STDC__", -1, T_CONST, STDC_VALUE, 0, -1);
+  if (CPP_OPTIONS (pfile)->objc)
+    install ("__OBJC__", -1, T_CONST, 1, 0, -1);
+/*  This is supplied using a -D by the compiler driver
+    so that it is present only when truly compiling with GNU C.  */
+/*  install ("__GNUC__", -1, T_CONST, 2, 0, -1);  */
+
+  if (CPP_OPTIONS (pfile)->debug_output)
+    {
+      char directive[2048];
+      register struct directive *dp = &directive_table[0];
+      struct tm *timebuf = timestamp (pfile);
+      cpp_buffer *pbuffer = CPP_BUFFER (pfile);
+
+      while (CPP_PREV_BUFFER (pbuffer))
+	pbuffer = CPP_PREV_BUFFER (pbuffer);
+      sprintf (directive, " __BASE_FILE__ \"%s\"\n",
+	       pbuffer->nominal_fname);
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+
+      sprintf (directive, " __VERSION__ \"%s\"\n", version_string);
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+
+#ifndef NO_BUILTIN_SIZE_TYPE
+      sprintf (directive, " __SIZE_TYPE__ %s\n", SIZE_TYPE);
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+#endif
+
+#ifndef NO_BUILTIN_PTRDIFF_TYPE
+      sprintf (directive, " __PTRDIFF_TYPE__ %s\n", PTRDIFF_TYPE);
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+#endif
+
+      sprintf (directive, " __WCHAR_TYPE__ %s\n", CPP_WCHAR_TYPE (pfile));
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+
+      sprintf (directive, " __DATE__ \"%s %2d %4d\"\n",
+	       monthnames[timebuf->tm_mon],
+	       timebuf->tm_mday, timebuf->tm_year + 1900);
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+
+      sprintf (directive, " __TIME__ \"%02d:%02d:%02d\"\n",
+	       timebuf->tm_hour, timebuf->tm_min, timebuf->tm_sec);
+      output_line_command (pfile, 0, same_file);
+      pass_thru_directive (directive, &directive[strlen (directive)], pfile, dp);
+
+      if (!CPP_TRADITIONAL (pfile))
+	{
+          sprintf (directive, " __STDC__ 1");
+          output_line_command (pfile, 0, same_file);
+          pass_thru_directive (directive, &directive[strlen (directive)],
+			       pfile, dp);
+	}
+      if (CPP_OPTIONS (pfile)->objc)
+	{
+          sprintf (directive, " __OBJC__ 1");
+          output_line_command (pfile, 0, same_file);
+          pass_thru_directive (directive, &directive[strlen (directive)],
+			       pfile, dp);
+	}
+    }
+}
+
+/* Return 1 iff a token ending in C1 followed directly by a token C2
+   could cause mis-tokenization. */
+
+static int
+unsafe_chars (c1, c2)
+     int c1, c2;
+{
+  switch (c1)
+    {
+    case '+': case '-':
+      if (c2 == c1 || c2 == '=')
+	return 1;
+      goto letter;
+    case '.':
+    case '0': case '1': case '2': case '3': case '4':
+    case '5': case '6': case '7': case '8': case '9':
+    case 'e': case 'E':
+      if (c2 == '-' || c2 == '+')
+	return 1; /* could extend a pre-processing number */
+      goto letter;
+    case 'L':
+      if (c2 == '\'' || c2 == '\"')
+	return 1;   /* Could turn into L"xxx" or L'xxx'. */
+      goto letter;
+    letter:
+    case '_':
+    case 'a': case 'b': case 'c': case 'd':           case 'f':
+    case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
+    case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
+    case 's': case 't': case 'u': case 'v': case 'w': case 'x':
+    case 'y': case 'z':
+    case 'A': case 'B': case 'C': case 'D':           case 'F':
+    case 'G': case 'H': case 'I': case 'J': case 'K':
+    case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
+    case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+    case 'Y': case 'Z':
+      /* We're in the middle of either a name or a pre-processing number. */
+      return (is_idchar[c2] || c2 == '.');
+    case '<': case '>': case '!': case '%': case '#': case ':':
+    case '^': case '&': case '|': case '*': case '/': case '=':
+      return (c2 == c1 || c2 == '=');
+    }
+  return 0;
+}
+
+/* Expand a macro call.
+   HP points to the symbol that is the macro being called.
+   Put the result of expansion onto the input stack
+   so that subsequent input by our caller will use it.
+
+   If macro wants arguments, caller has already verified that
+   an argument list follows; arguments come from the input stack.  */
+
+static void
+macroexpand (pfile, hp)
+     cpp_reader *pfile;
+     HASHNODE *hp;
+{
+  int nargs;
+  DEFINITION *defn = hp->value.defn;
+  register U_CHAR *xbuf;
+  long start_line, start_column;
+  int xbuf_len;
+  struct argdata *args;
+  long old_written = CPP_WRITTEN (pfile);
+#if 0
+  int start_line = instack[indepth].lineno;
+#endif
+  int rest_args, rest_zero;
+      register int i;
+
+#if 0
+  CHECK_DEPTH (return;);
+#endif
+
+#if 0
+  /* This macro is being used inside a #if, which means it must be */
+  /* recorded as a precondition.  */
+  if (pcp_inside_if && pcp_outfile && defn->predefined)
+    dump_single_macro (hp, pcp_outfile);
+#endif
+
+  pfile->output_escapes++;
+  cpp_buf_line_and_col (cpp_file_buffer (pfile), &start_line, &start_column);
+
+  nargs = defn->nargs;
+
+  if (nargs >= 0)
+    {
+      enum cpp_token token;
+
+      args = (struct argdata *) alloca ((nargs + 1) * sizeof (struct argdata));
+
+      for (i = 0; i < nargs; i++)
+	{
+	  args[i].raw = args[i].expanded = 0;
+	  args[i].raw_length = 0; 
+	  args[i].expand_length = args[i].stringified_length = -1;
+	  args[i].use_count = 0;
+	}
+
+      /* Parse all the macro args that are supplied.  I counts them.
+	 The first NARGS args are stored in ARGS.
+	 The rest are discarded.  If rest_args is set then we assume
+	 macarg absorbed the rest of the args. */
+      i = 0;
+      rest_args = 0;
+      rest_args = 0;
+      FORWARD(1); /* Discard the open-parenthesis before the first arg.  */
+      do
+	{
+	  if (rest_args)
+	    continue;
+	  if (i < nargs || (nargs == 0 && i == 0))
+	    {
+	      /* if we are working on last arg which absorbs rest of args... */
+	      if (i == nargs - 1 && defn->rest_args)
+		rest_args = 1;
+	      args[i].raw = CPP_WRITTEN (pfile);
+	      token = macarg (pfile, rest_args);
+	      args[i].raw_length = CPP_WRITTEN (pfile) - args[i].raw;
+	      args[i].newlines = 0; /* FIXME */
+	    }
+	  else
+	    token = macarg (pfile, 0);
+	  if (token == CPP_EOF || token == CPP_POP)
+	    {
+	      cpp_error_with_line (pfile, start_line, start_column,
+				   "unterminated macro call");
+	      return;
+	    }
+	  i++;
+	} while (token == CPP_COMMA);
+
+      /* If we got one arg but it was just whitespace, call that 0 args.  */
+      if (i == 1)
+	{
+	  register U_CHAR *bp = ARG_BASE + args[0].raw;
+	  register U_CHAR *lim = bp + args[0].raw_length;
+	  /* cpp.texi says for foo ( ) we provide one argument.
+	     However, if foo wants just 0 arguments, treat this as 0.  */
+	  if (nargs == 0)
+	    while (bp != lim && is_space[*bp]) bp++;
+	  if (bp == lim)
+	    i = 0;
+	}
+
+      /* Don't output an error message if we have already output one for
+	 a parse error above.  */
+      rest_zero = 0;
+      if (nargs == 0 && i > 0)
+	{
+	  cpp_error (pfile, "arguments given to macro `%s'", hp->name);
+	}
+      else if (i < nargs)
+	{
+	  /* traditional C allows foo() if foo wants one argument.  */
+	  if (nargs == 1 && i == 0 && CPP_TRADITIONAL (pfile))
+	    ;
+	  /* the rest args token is allowed to absorb 0 tokens */
+	  else if (i == nargs - 1 && defn->rest_args)
+	    rest_zero = 1;
+	  else if (i == 0)
+	    cpp_error (pfile, "macro `%s' used without args", hp->name);
+	  else if (i == 1)
+	    cpp_error (pfile, "macro `%s' used with just one arg", hp->name);
+	  else
+	    cpp_error (pfile, "macro `%s' used with only %d args",
+		       hp->name, i);
+      }
+      else if (i > nargs)
+	{
+	  cpp_error (pfile,
+		     "macro `%s' used with too many (%d) args", hp->name, i);
+	}
+    }
+
+  /* If macro wants zero args, we parsed the arglist for checking only.
+     Read directly from the macro definition.  */
+  if (nargs <= 0)
+    {
+      xbuf = defn->expansion;
+      xbuf_len = defn->length;
+    }
+  else
+    {
+      register U_CHAR *exp = defn->expansion;
+      register int offset;	/* offset in expansion,
+				   copied a piece at a time */
+      register int totlen;	/* total amount of exp buffer filled so far */
+
+      register struct reflist *ap, *last_ap;
+
+      /* Macro really takes args.  Compute the expansion of this call.  */
+
+      /* Compute length in characters of the macro's expansion.
+	 Also count number of times each arg is used.  */
+      xbuf_len = defn->length;
+      for (ap = defn->pattern; ap != NULL; ap = ap->next)
+	{
+	  if (ap->stringify)
+	    {
+	      register struct argdata *arg = &args[ap->argno];
+	      /* Stringify it it hasn't already been */
+	      if (arg->stringified_length < 0)
+		{
+		  int arglen = arg->raw_length;
+		  int escaped = 0;
+		  int in_string = 0;
+		  int c;
+		  /* Initially need_space is -1.  Otherwise, 1 means the
+		     previous character was a space, but we suppressed it;
+		     0 means the previous character was a non-space. */
+		  int need_space = -1;
+		  i = 0;
+		  arg->stringified = CPP_WRITTEN (pfile);
+		  if (!CPP_TRADITIONAL (pfile))
+		    CPP_PUTC (pfile, '\"'); /* insert beginning quote */
+		  for (; i < arglen; i++)
+		    {
+		      c = (ARG_BASE + arg->raw)[i];
+
+		      if (! in_string)
+			{
+			  /* Internal sequences of whitespace are replaced by
+			     one space except within an string or char token.*/
+			  if (is_space[c])
+			    {
+			      if (CPP_WRITTEN (pfile) > arg->stringified
+				  && (CPP_PWRITTEN (pfile))[-1] == '@')
+				{
+				  /* "@ " escape markers are removed */
+				  CPP_ADJUST_WRITTEN (pfile, -1);
+				  continue;
+				}
+			      if (need_space == 0)
+				need_space = 1;
+			      continue;
+			    }
+			  else if (need_space > 0)
+			    CPP_PUTC (pfile, ' ');
+			  need_space = 0;
+			}
+
+		      if (escaped)
+			escaped = 0;
+		      else
+			{
+			  if (c == '\\')
+			    escaped = 1;
+			  if (in_string)
+			    {
+			      if (c == in_string)
+				in_string = 0;
+			    }
+			  else if (c == '\"' || c == '\'')
+			    in_string = c;
+			}
+
+		      /* Escape these chars */
+		      if (c == '\"' || (in_string && c == '\\'))
+			CPP_PUTC (pfile, '\\');
+		      if (isprint (c))
+			CPP_PUTC (pfile, c);
+		      else
+			{
+			  CPP_RESERVE (pfile, 4);
+			  sprintf (CPP_PWRITTEN (pfile), "\\%03o",
+				   (unsigned int) c);
+			  CPP_ADJUST_WRITTEN (pfile, 4);
+			}
+		    }
+		  if (!CPP_TRADITIONAL (pfile))
+		    CPP_PUTC (pfile, '\"'); /* insert ending quote */
+		  arg->stringified_length
+		    = CPP_WRITTEN (pfile) - arg->stringified;
+		}
+	      xbuf_len += args[ap->argno].stringified_length;
+	    }
+	  else if (ap->raw_before || ap->raw_after || CPP_TRADITIONAL (pfile))
+	    /* Add 4 for two newline-space markers to prevent
+	       token concatenation.  */
+	    xbuf_len += args[ap->argno].raw_length + 4;
+	  else
+	    {
+	      /* We have an ordinary (expanded) occurrence of the arg.
+		 So compute its expansion, if we have not already.  */
+	      if (args[ap->argno].expand_length < 0)
+		{
+		  args[ap->argno].expanded = CPP_WRITTEN (pfile);
+		  cpp_expand_to_buffer (pfile,
+					ARG_BASE + args[ap->argno].raw,
+					args[ap->argno].raw_length);
+
+		  args[ap->argno].expand_length
+		    = CPP_WRITTEN (pfile) - args[ap->argno].expanded;
+		}
+
+	      /* Add 4 for two newline-space markers to prevent
+		 token concatenation.  */
+	      xbuf_len += args[ap->argno].expand_length + 4;
+	    }
+	  if (args[ap->argno].use_count < 10)
+	    args[ap->argno].use_count++;
+	}
+
+      xbuf = (U_CHAR *) xmalloc (xbuf_len + 1);
+
+      /* Generate in XBUF the complete expansion
+	 with arguments substituted in.
+	 TOTLEN is the total size generated so far.
+	 OFFSET is the index in the definition
+	 of where we are copying from.  */
+      offset = totlen = 0;
+      for (last_ap = NULL, ap = defn->pattern; ap != NULL;
+	   last_ap = ap, ap = ap->next)
+	{
+	  register struct argdata *arg = &args[ap->argno];
+	  int count_before = totlen;
+
+	  /* Add chars to XBUF.  */
+	  for (i = 0; i < ap->nchars; i++, offset++)
+	    xbuf[totlen++] = exp[offset];
+
+	  /* If followed by an empty rest arg with concatenation,
+	     delete the last run of nonwhite chars.  */
+	  if (rest_zero && totlen > count_before
+	      && ((ap->rest_args && ap->raw_before)
+		  || (last_ap != NULL && last_ap->rest_args
+		      && last_ap->raw_after)))
+	    {
+	      /* Delete final whitespace.  */
+	      while (totlen > count_before && is_space[xbuf[totlen - 1]])
+		totlen--;
+
+	      /* Delete the nonwhites before them.  */
+	      while (totlen > count_before && ! is_space[xbuf[totlen - 1]])
+		totlen--;
+	    }
+
+	  if (ap->stringify != 0)
+	    {
+	      bcopy (ARG_BASE + arg->stringified,
+		     xbuf + totlen, arg->stringified_length);
+	      totlen += arg->stringified_length;
+	    }
+	  else if (ap->raw_before || ap->raw_after || CPP_TRADITIONAL (pfile))
+	    {
+	      U_CHAR *p1 = ARG_BASE + arg->raw;
+	      U_CHAR *l1 = p1 + arg->raw_length;
+	      if (ap->raw_before)
+		{
+		  while (p1 != l1 && is_space[*p1]) p1++;
+		  while (p1 != l1 && is_idchar[*p1])
+		    xbuf[totlen++] = *p1++;
+		}
+	      if (ap->raw_after)
+		{
+		  /* Arg is concatenated after: delete trailing whitespace,
+		     whitespace markers, and no-reexpansion markers.  */
+		  while (p1 != l1)
+		    {
+		      if (is_space[l1[-1]]) l1--;
+		      else if (l1[-1] == '-')
+			{
+			  U_CHAR *p2 = l1 - 1;
+			  /* If a `-' is preceded by an odd number of newlines then it
+			     and the last newline are a no-reexpansion marker.  */
+			  while (p2 != p1 && p2[-1] == '\n') p2--;
+			  if ((l1 - 1 - p2) & 1) {
+			    l1 -= 2;
+			  }
+			  else break;
+			}
+		      else break;
+		    }
+		}
+
+	      bcopy (p1, xbuf + totlen, l1 - p1);
+	      totlen += l1 - p1;
+	    }
+	  else
+	    {
+	      U_CHAR *expanded = ARG_BASE + arg->expanded;
+	      if (!ap->raw_before && totlen > 0 && arg->expand_length
+		  && !CPP_TRADITIONAL(pfile)
+		  && unsafe_chars (xbuf[totlen-1], expanded[0]))
+		{
+		  xbuf[totlen++] = '@';
+		  xbuf[totlen++] = ' ';
+		}
+
+	      bcopy (expanded, xbuf + totlen, arg->expand_length);
+	      totlen += arg->expand_length;
+
+	      if (!ap->raw_after && totlen > 0 && offset < defn->length
+		  && !CPP_TRADITIONAL(pfile)
+		  && unsafe_chars (xbuf[totlen-1], exp[offset]))
+		{
+		  xbuf[totlen++] = '@';
+		  xbuf[totlen++] = ' ';
+		}
+
+	      /* If a macro argument with newlines is used multiple times,
+		 then only expand the newlines once.  This avoids creating
+		 output lines which don't correspond to any input line,
+		 which confuses gdb and gcov.  */
+	      if (arg->use_count > 1 && arg->newlines > 0)
+		{
+		  /* Don't bother doing change_newlines for subsequent
+		     uses of arg.  */
+		  arg->use_count = 1;
+		  arg->expand_length
+		    = change_newlines (expanded, arg->expand_length);
+		}
+	    }
+
+	  if (totlen > xbuf_len)
+	    abort ();
+      }
+
+      /* if there is anything left of the definition
+	 after handling the arg list, copy that in too. */
+
+      for (i = offset; i < defn->length; i++)
+	{
+	  /* if we've reached the end of the macro */
+	  if (exp[i] == ')')
+	    rest_zero = 0;
+	  if (! (rest_zero && last_ap != NULL && last_ap->rest_args
+		 && last_ap->raw_after))
+	    xbuf[totlen++] = exp[i];
+	}
+
+      xbuf[totlen] = 0;
+      xbuf_len = totlen;
+
+    }
+
+  pfile->output_escapes--;
+
+  /* Now put the expansion on the input stack
+     so our caller will commence reading from it.  */
+  push_macro_expansion (pfile, xbuf, xbuf_len, hp);
+  CPP_BUFFER (pfile)->has_escapes = 1;
+
+  /* Pop the space we've used in the token_buffer for argument expansion. */
+  CPP_SET_WRITTEN (pfile, old_written);
+    
+  /* Recursive macro use sometimes works traditionally.
+     #define foo(x,y) bar (x (y,0), y)
+     foo (foo, baz)  */
+  
+  if (!CPP_TRADITIONAL (pfile))
+    hp->type = T_DISABLED;
+}
+
+static void
+push_macro_expansion (pfile, xbuf, xbuf_len, hp)
+     cpp_reader *pfile;
+     register U_CHAR *xbuf;
+     int xbuf_len;
+     HASHNODE *hp;
+{
+  register cpp_buffer *mbuf = cpp_push_buffer (pfile, xbuf, xbuf_len);
+  mbuf->cleanup = macro_cleanup;
+  mbuf->data = hp;
+
+  /* The first chars of the expansion should be a "@ " added by
+     collect_expansion.  This is to prevent accidental token-pasting
+     between the text preceding the macro invocation, and the macro
+     expansion text.
+
+     We would like to avoid adding unneeded spaces (for the sake of
+     tools that use cpp, such as imake).  In some common cases we can
+     tell that it is safe to omit the space.
+
+     The character before the macro invocation cannot have been an
+     idchar (or else it would have been pasted with the idchars of
+     the macro name).  Therefore, if the first non-space character
+     of the expansion is an idchar, we do not need the extra space
+     to prevent token pasting.
+
+     Also, we don't need the extra space if the first char is '(',
+     or some other (less common) characters.  */
+
+  if (xbuf[0] == '@' && xbuf[1] == ' '
+      && (is_idchar[xbuf[2]] || xbuf[2] == '(' || xbuf[2] == '\''
+	  || xbuf[2] == '\"'))
+    mbuf->cur += 2;
+}
+
+/* Like cpp_get_token, except that it does not read past end-of-line.
+   Also, horizontal space is skipped, and macros are popped.  */
+
+static enum cpp_token
+get_directive_token (pfile)
+     cpp_reader *pfile;
+{
+  for (;;)
+    {
+      long old_written = CPP_WRITTEN (pfile);
+      enum cpp_token token;
+      cpp_skip_hspace (pfile);
+      if (PEEKC () == '\n')
+	  return CPP_VSPACE;
+      token = cpp_get_token (pfile);
+      switch (token)
+      {
+      case CPP_POP:
+	  if (! CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
+	      return token;
+	  /* ... else fall though ... */
+      case CPP_HSPACE:  case CPP_COMMENT:
+	  CPP_SET_WRITTEN (pfile, old_written);
+	  break;
+      default:
+	  return token;
+      }
+    }
+}
+
+/* Handle #include and #import.
+   This function expects to see "fname" or <fname> on the input.
+
+   The input is normally in part of the output_buffer following
+   CPP_WRITTEN, and will get overwritten by output_line_command.
+   I.e. in input file specification has been popped by handle_directive.
+   This is safe. */
+
+static int
+do_include (pfile, keyword, unused1, unused2)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *unused1, *unused2;
+{
+  int importing = (keyword->type == T_IMPORT);
+  int skip_dirs = (keyword->type == T_INCLUDE_NEXT);
+  char *fname;		/* Dynamically allocated fname buffer */
+  char *pcftry;
+  char *pcfname;
+  U_CHAR *fbeg, *fend;		/* Beginning and end of fname */
+  enum cpp_token token;
+
+  /* Chain of dirs to search */
+  struct file_name_list *search_start = CPP_OPTIONS (pfile)->include;
+  struct file_name_list dsp[1];	/* First in chain, if #include "..." */
+  struct file_name_list *searchptr = 0;
+  long old_written = CPP_WRITTEN (pfile);
+
+  int flen;
+
+  int f;			/* file number */
+
+  int retried = 0;		/* Have already tried macro
+				   expanding the include line*/
+  int angle_brackets = 0;	/* 0 for "...", 1 for <...> */
+  int pcf = -1;
+  char *pcfbuf;
+  char *pcfbuflimit;
+  int pcfnum;
+  f= -1;			/* JF we iz paranoid! */
+
+  if (importing && CPP_OPTIONS (pfile)->warn_import
+      && !CPP_OPTIONS (pfile)->inhibit_warnings
+      && !CPP_BUFFER (pfile)->system_header_p && !pfile->import_warning)
+    {
+      pfile->import_warning = 1;
+      cpp_warning (pfile, "using `#import' is not recommended");
+      fprintf (stderr, "The fact that a certain header file need not be processed more than once\n");
+      fprintf (stderr, "should be indicated in the header file, not where it is used.\n");
+      fprintf (stderr, "The best way to do this is with a conditional of this form:\n\n");
+      fprintf (stderr, "  #ifndef _FOO_H_INCLUDED\n");
+      fprintf (stderr, "  #define _FOO_H_INCLUDED\n");
+      fprintf (stderr, "  ... <real contents of file> ...\n");
+      fprintf (stderr, "  #endif /* Not _FOO_H_INCLUDED */\n\n");
+      fprintf (stderr, "Then users can use `#include' any number of times.\n");
+      fprintf (stderr, "GNU C automatically avoids processing the file more than once\n");
+      fprintf (stderr, "when it is equipped with such a conditional.\n");
+    }
+
+  pfile->parsing_include_directive++;
+  token = get_directive_token (pfile);
+  pfile->parsing_include_directive--;
+
+  if (token == CPP_STRING)
+    {
+      /* FIXME - check no trailing garbage */
+      fbeg = pfile->token_buffer + old_written + 1;
+      fend = CPP_PWRITTEN (pfile) - 1;
+      if (fbeg[-1] == '<')
+	{
+	  angle_brackets = 1;
+	  /* If -I-, start with the first -I dir after the -I-.  */
+	  if (CPP_OPTIONS (pfile)->first_bracket_include)
+	    search_start = CPP_OPTIONS (pfile)->first_bracket_include;
+	}
+      /* If -I- was specified, don't search current dir, only spec'd ones. */
+      else if (! CPP_OPTIONS (pfile)->ignore_srcdir)
+	{
+	  cpp_buffer *fp;
+	  /* We have "filename".  Figure out directory this source
+	     file is coming from and put it on the front of the list. */
+
+	  for (fp = CPP_BUFFER (pfile); fp != NULL; fp = CPP_PREV_BUFFER (fp))
+	    {
+	      int n;
+	      char *ep,*nam;
+
+	      if ((nam = fp->nominal_fname) != NULL)
+		{
+		  /* Found a named file.  Figure out dir of the file,
+		     and put it in front of the search list.  */
+		  dsp[0].next = search_start;
+		  search_start = dsp;
+#ifndef VMS
+		  ep = rindex (nam, '/');
+#else				/* VMS */
+		  ep = rindex (nam, ']');
+		  if (ep == NULL) ep = rindex (nam, '>');
+		  if (ep == NULL) ep = rindex (nam, ':');
+		  if (ep != NULL) ep++;
+#endif				/* VMS */
+		  if (ep != NULL)
+		    {
+		      n = ep - nam;
+		      dsp[0].fname = (char *) alloca (n + 1);
+		      strncpy (dsp[0].fname, nam, n);
+		      dsp[0].fname[n] = '\0';
+		      if (n + INCLUDE_LEN_FUDGE > pfile->max_include_len)
+			pfile->max_include_len = n + INCLUDE_LEN_FUDGE;
+		    }
+		  else
+		    {
+		      dsp[0].fname = 0; /* Current directory */
+		    }
+		  dsp[0].got_name_map = 0;
+		  break;
+		}
+	    }
+	}
+    }
+#ifdef VMS
+  else if (token == CPP_NAME)
+    {
+      /*
+       * Support '#include xyz' like VAX-C to allow for easy use of all the
+       * decwindow include files. It defaults to '#include <xyz.h>' (so the
+       * code from case '<' is repeated here) and generates a warning.
+       */
+      cpp_warning (pfile,
+		   "VAX-C-style include specification found, use '#include <filename.h>' !");
+      angle_brackets = 1;
+      /* If -I-, start with the first -I dir after the -I-.  */
+      if (CPP_OPTIONS (pfile)->first_bracket_include)
+	search_start = CPP_OPTIONS (pfile)->first_bracket_include;
+      fbeg = pfile->token_buffer + old_written;
+      fend = CPP_PWRITTEN (pfile);
+    }
+#endif
+  else
+    {
+      cpp_error (pfile,
+		 "`#%s' expects \"FILENAME\" or <FILENAME>", keyword->name);
+      CPP_SET_WRITTEN (pfile, old_written);
+      skip_rest_of_line (pfile);
+      return 0;
+    }
+
+  *fend = 0;
+
+  token = get_directive_token (pfile);
+  if (token != CPP_VSPACE)
+    {
+      cpp_error (pfile, "junk at end of `#include'");
+      while (token != CPP_VSPACE && token != CPP_EOF && token != CPP_POP)
+	token = get_directive_token (pfile);
+    }
+
+  /* For #include_next, skip in the search path
+     past the dir in which the containing file was found.  */
+  if (skip_dirs)
+    {
+      cpp_buffer *fp;
+      for (fp = CPP_BUFFER (pfile); fp != NULL; fp = CPP_PREV_BUFFER (fp))
+	if (fp->fname != NULL)
+	  {
+	    /* fp->dir is null if the containing file was specified with
+	       an absolute file name.  In that case, don't skip anything.  */
+	    if (fp->dir == SELF_DIR_DUMMY)
+	      search_start = CPP_OPTIONS (pfile)->include;
+	    else if (fp->dir)
+	      search_start = fp->dir->next;
+	    break;
+	  }
+    }
+
+  CPP_SET_WRITTEN (pfile, old_written);
+
+  flen = fend - fbeg;
+
+  if (flen == 0)
+    {
+      cpp_error (pfile, "empty file name in `#%s'", keyword->name);
+      return 0;
+    }
+
+  /* Allocate this permanently, because it gets stored in the definitions
+     of macros.  */
+  fname = (char *) xmalloc (pfile->max_include_len + flen + 4);
+  /* + 2 above for slash and terminating null.  */
+  /* + 2 added for '.h' on VMS (to support '#include filename') */
+
+  /* If specified file name is absolute, just open it.  */
+
+  if (*fbeg == '/') {
+    strncpy (fname, fbeg, flen);
+    fname[flen] = 0;
+    if (redundant_include_p (pfile, fname))
+      return 0;
+    if (importing)
+      f = lookup_import (pfile, fname, NULL_PTR);
+    else
+      f = open_include_file (pfile, fname, NULL_PTR);
+    if (f == -2)
+      return 0;		/* Already included this file */
+  } else {
+    /* Search directory path, trying to open the file.
+       Copy each filename tried into FNAME.  */
+
+    for (searchptr = search_start; searchptr; searchptr = searchptr->next) {
+      if (searchptr->fname) {
+	/* The empty string in a search path is ignored.
+	   This makes it possible to turn off entirely
+	   a standard piece of the list.  */
+	if (searchptr->fname[0] == 0)
+	  continue;
+	strcpy (fname, searchptr->fname);
+	strcat (fname, "/");
+	fname[strlen (fname) + flen] = 0;
+      } else {
+	fname[0] = 0;
+      }
+      strncat (fname, fbeg, flen);
+#ifdef VMS
+      /* Change this 1/2 Unix 1/2 VMS file specification into a
+         full VMS file specification */
+      if (searchptr->fname && (searchptr->fname[0] != 0)) {
+	/* Fix up the filename */
+	hack_vms_include_specification (fname);
+      } else {
+      	/* This is a normal VMS filespec, so use it unchanged.  */
+	strncpy (fname, fbeg, flen);
+	fname[flen] = 0;
+	/* if it's '#include filename', add the missing .h */
+	if (index(fname,'.')==NULL) {
+	  strcat (fname, ".h");
+	}
+      }
+#endif /* VMS */
+      /* ??? There are currently 3 separate mechanisms for avoiding processing
+	 of redundant include files: #import, #pragma once, and
+	 redundant_include_p.  It would be nice if they were unified.  */
+      if (redundant_include_p (pfile, fname))
+	return 0;
+      if (importing)
+	f = lookup_import (pfile, fname, searchptr);
+      else
+	f = open_include_file (pfile, fname, searchptr);
+      if (f == -2)
+	return 0;			/* Already included this file */
+#ifdef EACCES
+      else if (f == -1 && errno == EACCES)
+	cpp_warning (pfile, "Header file %s exists, but is not readable",
+		     fname);
+#endif
+      if (f >= 0)
+	break;
+    }
+  }
+
+  if (f < 0)
+    {
+      /* A file that was not found.  */
+      strncpy (fname, fbeg, flen);
+      fname[flen] = 0;
+      /* If generating dependencies and -MG was specified, we assume missing
+	 files are leaf files, living in the same directory as the source file
+	 or other similar place; these missing files may be generated from
+	 other files and may not exist yet (eg: y.tab.h).  */
+
+      if (CPP_OPTIONS(pfile)->print_deps_missing_files
+	  && CPP_PRINT_DEPS (pfile)
+	  > (angle_brackets || (pfile->system_include_depth > 0)))
+	{
+	  /* If it was requested as a system header file,
+	     then assume it belongs in the first place to look for such.  */
+	  if (angle_brackets)
+	    {
+	      for (searchptr = search_start; searchptr;
+		   searchptr = searchptr->next)
+		{
+		  if (searchptr->fname)
+		    {
+		      char *p;
+
+		      if (searchptr->fname[0] == 0)
+			continue;
+		      p = (char *) alloca (strlen (searchptr->fname)
+					   + strlen (fname) + 2);
+		      strcpy (p, searchptr->fname);
+		      strcat (p, "/");
+		      strcat (p, fname);
+		      deps_output (pfile, p, ' ');
+		      break;
+		    }
+		}
+	    }
+	  else
+	    {
+	      /* Otherwise, omit the directory, as if the file existed
+		 in the directory with the source.  */
+	      deps_output (pfile, fname, ' ');
+	    }
+	}
+      /* If -M was specified, and this header file won't be added to the
+	 dependency list, then don't count this as an error, because we can
+	 still produce correct output.  Otherwise, we can't produce correct
+	 output, because there may be dependencies we need inside the missing
+	 file, and we don't know what directory this missing file exists in.*/
+      else if (CPP_PRINT_DEPS (pfile)
+	       && (CPP_PRINT_DEPS (pfile)
+		   <= (angle_brackets || (pfile->system_include_depth > 0))))
+	cpp_warning (pfile, "No include path in which to find %s", fname);
+      else if (search_start)
+	cpp_error_from_errno (pfile, fname);
+      else
+	cpp_error (pfile, "No include path in which to find %s", fname);
+    }
+  else {
+    /* Check to see if this include file is a once-only include file.
+       If so, give up.  */
+
+    struct file_name_list* ptr;
+
+    for (ptr = pfile->dont_repeat_files; ptr; ptr = ptr->next) {
+      if (!strcmp (ptr->fname, fname)) {
+	close (f);
+        return 0;				/* This file was once'd. */
+      }
+    }
+
+    for (ptr = pfile->all_include_files; ptr; ptr = ptr->next) {
+      if (!strcmp (ptr->fname, fname))
+        break;				/* This file was included before. */
+    }
+
+    if (ptr == 0) {
+      /* This is the first time for this file.  */
+      /* Add it to list of files included.  */
+
+      ptr = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
+      ptr->control_macro = 0;
+      ptr->c_system_include_path = 0;
+      ptr->next = pfile->all_include_files;
+      pfile->all_include_files = ptr;
+      ptr->fname = savestring (fname);
+      ptr->got_name_map = 0;
+
+      /* For -M, add this file to the dependencies.  */
+      if (CPP_PRINT_DEPS (pfile)
+	  > (angle_brackets || (pfile->system_include_depth > 0)))
+	deps_output (pfile, fname, ' ');
+    }   
+
+    /* Handle -H option.  */
+    if (CPP_OPTIONS(pfile)->print_include_names)
+      {
+	cpp_buffer *buf = CPP_BUFFER (pfile);
+	while ((buf = CPP_PREV_BUFFER (buf)) != NULL)
+	  putc ('.', stderr);
+	fprintf (stderr, "%s\n", fname);
+      }
+
+    if (angle_brackets)
+      pfile->system_include_depth++;
+
+    /* Actually process the file.  */
+
+    /* Record file on "seen" list for #import. */
+    add_import (pfile, f, fname);
+
+    pcftry = (char *) alloca (strlen (fname) + 30);
+    pcfbuf = 0;
+    pcfnum = 0;
+
+#if 0
+    if (!no_precomp)
+      {
+	struct stat stat_f;
+
+	fstat (f, &stat_f);
+
+	do {
+	  sprintf (pcftry, "%s%d", fname, pcfnum++);
+
+	  pcf = open (pcftry, O_RDONLY, 0666);
+	  if (pcf != -1)
+	    {
+	      struct stat s;
+
+	      fstat (pcf, &s);
+	      if (bcmp ((char *) &stat_f.st_ino, (char *) &s.st_ino,
+			sizeof (s.st_ino))
+		  || stat_f.st_dev != s.st_dev)
+		{
+		  pcfbuf = check_precompiled (pcf, fname, &pcfbuflimit);
+		  /* Don't need it any more.  */
+		  close (pcf);
+		}
+	      else
+		{
+		  /* Don't need it at all.  */
+		  close (pcf);
+		  break;
+		}
+	    }
+	} while (pcf != -1 && !pcfbuf);
+      }
+#endif
+    
+    /* Actually process the file */
+    cpp_push_buffer (pfile, NULL, 0);
+    if (finclude (pfile, f, fname, is_system_include (pfile, fname),
+		  searchptr != dsp ? searchptr : SELF_DIR_DUMMY))
+      {
+	output_line_command (pfile, 0, enter_file);
+	pfile->only_seen_white = 2;
+      }
+
+    if (angle_brackets)
+      pfile->system_include_depth--;
+  }
+  return 0;
+}
+
+/* Return nonzero if there is no need to include file NAME
+   because it has already been included and it contains a conditional
+   to make a repeated include do nothing.  */
+
+static int
+redundant_include_p (pfile, name)
+     cpp_reader *pfile;
+     char *name;
+{
+  struct file_name_list *l = pfile->all_include_files;
+  for (; l; l = l->next)
+    if (! strcmp (name, l->fname)
+	&& l->control_macro
+	&& cpp_lookup (pfile, l->control_macro, -1, -1))
+      return 1;
+  return 0;
+}
+
+/* Return nonzero if the given FILENAME is an absolute pathname which
+   designates a file within one of the known "system" include file
+   directories.  We assume here that if the given FILENAME looks like
+   it is the name of a file which resides either directly in a "system"
+   include file directory, or within any subdirectory thereof, then the
+   given file must be a "system" include file.  This function tells us
+   if we should suppress pedantic errors/warnings for the given FILENAME.
+
+   The value is 2 if the file is a C-language system header file
+   for which C++ should (on most systems) assume `extern "C"'.  */
+
+static int
+is_system_include (pfile, filename)
+     cpp_reader *pfile;
+     register char *filename;
+{
+  struct file_name_list *searchptr;
+
+  for (searchptr = CPP_OPTIONS (pfile)->first_system_include; searchptr;
+       searchptr = searchptr->next)
+    if (searchptr->fname) {
+      register char *sys_dir = searchptr->fname;
+      register unsigned length = strlen (sys_dir);
+
+      if (! strncmp (sys_dir, filename, length) && filename[length] == '/')
+	{
+	  if (searchptr->c_system_include_path)
+	    return 2;
+	  else
+	    return 1;
+	}
+    }
+  return 0;
+}
+
+
+/*
+ * Install a name in the assertion hash table.
+ *
+ * If LEN is >= 0, it is the length of the name.
+ * Otherwise, compute the length by scanning the entire name.
+ *
+ * If HASH is >= 0, it is the precomputed hash code.
+ * Otherwise, compute the hash code.
+ */
+static ASSERTION_HASHNODE *
+assertion_install (pfile, name, len, hash)
+     cpp_reader *pfile;
+     U_CHAR *name;
+     int len;
+     int hash;
+{
+  register ASSERTION_HASHNODE *hp;
+  register int i, bucket;
+  register U_CHAR *p, *q;
+
+  i = sizeof (ASSERTION_HASHNODE) + len + 1;
+  hp = (ASSERTION_HASHNODE *) xmalloc (i);
+  bucket = hash;
+  hp->bucket_hdr = &pfile->assertion_hashtab[bucket];
+  hp->next = pfile->assertion_hashtab[bucket];
+  pfile->assertion_hashtab[bucket] = hp;
+  hp->prev = NULL;
+  if (hp->next != NULL)
+    hp->next->prev = hp;
+  hp->length = len;
+  hp->value = 0;
+  hp->name = ((U_CHAR *) hp) + sizeof (ASSERTION_HASHNODE);
+  p = hp->name;
+  q = name;
+  for (i = 0; i < len; i++)
+    *p++ = *q++;
+  hp->name[len] = 0;
+  return hp;
+}
+/*
+ * find the most recent hash node for name name (ending with first
+ * non-identifier char) installed by install
+ *
+ * If LEN is >= 0, it is the length of the name.
+ * Otherwise, compute the length by scanning the entire name.
+ *
+ * If HASH is >= 0, it is the precomputed hash code.
+ * Otherwise, compute the hash code.
+ */
+
+static ASSERTION_HASHNODE *
+assertion_lookup (pfile, name, len, hash)
+     cpp_reader *pfile;
+     U_CHAR *name;
+     int len;
+     int hash;
+{
+  register ASSERTION_HASHNODE *bucket;
+
+  bucket = pfile->assertion_hashtab[hash];
+  while (bucket) {
+    if (bucket->length == len && strncmp (bucket->name, name, len) == 0)
+      return bucket;
+    bucket = bucket->next;
+  }
+  return NULL;
+}
+
+static void
+delete_assertion (hp)
+     ASSERTION_HASHNODE *hp;
+{
+  struct tokenlist_list *tail;
+  if (hp->prev != NULL)
+    hp->prev->next = hp->next;
+  if (hp->next != NULL)
+    hp->next->prev = hp->prev;
+
+  for (tail = hp->value; tail; )
+    {
+      struct tokenlist_list *next = tail->next;
+      free_token_list (tail->tokens);
+      free (tail);
+      tail = next;
+    }
+
+  /* make sure that the bucket chain header that
+     the deleted guy was on points to the right thing afterwards. */
+  if (hp == *hp->bucket_hdr)
+    *hp->bucket_hdr = hp->next;
+
+  free (hp);
+}
+
+/* Convert a character string literal into a nul-terminated string.
+   The input string is [IN ... LIMIT).
+   The result is placed in RESULT.  RESULT can be the same as IN.
+   The value returned in the end of the string written to RESULT,
+   or NULL on error.  */
+
+static U_CHAR*
+convert_string (pfile, result, in, limit, handle_escapes)
+     cpp_reader *pfile;
+     register U_CHAR *result, *in, *limit;
+     int handle_escapes;
+{
+  U_CHAR c;
+  c = *in++;
+  if (c != '\"')
+    return NULL;
+  while (in < limit)
+    {
+      U_CHAR c = *in++;
+      switch (c)
+	{
+	case '\0':
+	  return NULL;
+	case '\"':
+	  limit = in;
+	  break;
+	case '\\':
+	  if (handle_escapes)
+	    {
+	      char *bpc = (char *) in;
+	      int i = (U_CHAR) cpp_parse_escape (pfile, &bpc);
+	      in = (U_CHAR *) bpc;
+	      if (i >= 0)
+		*result++ = (U_CHAR)c;
+	      break;
+	    }
+	  /* else fall through */
+	default:
+	  *result++ = c;
+	}
+    }
+  *result = 0;
+  return result;
+}
+
+/*
+ * interpret #line command.  Remembers previously seen fnames
+ * in its very own hash table.
+ */
+#define FNAME_HASHSIZE 37
+
+static int
+do_line (pfile, keyword)
+     cpp_reader *pfile;
+     struct directive *keyword;
+{
+  cpp_buffer *ip = CPP_BUFFER (pfile);
+  int new_lineno;
+  long old_written = CPP_WRITTEN (pfile);
+  enum file_change_code file_change = same_file;
+  enum cpp_token token;
+  int i;
+
+  token = get_directive_token (pfile);
+
+  if (token != CPP_NUMBER
+      || !isdigit(pfile->token_buffer[old_written]))
+    {
+      cpp_error (pfile, "invalid format `#line' command");
+      goto bad_line_directive;
+    }
+
+  /* The Newline at the end of this line remains to be processed.
+     To put the next line at the specified line number,
+     we must store a line number now that is one less.  */
+  new_lineno = atoi (pfile->token_buffer + old_written) - 1;
+  CPP_SET_WRITTEN (pfile, old_written);
+
+  /* NEW_LINENO is one less than the actual line number here.  */
+  if (CPP_PEDANTIC (pfile) && new_lineno < 0)
+    cpp_pedwarn (pfile, "line number out of range in `#line' command");
+
+#if 0 /* #line 10"foo.c" is supposed to be allowed.  */
+  if (PEEKC() && !is_space[PEEKC()]) {
+    cpp_error (pfile, "invalid format `#line' command");
+    goto bad_line_directive;
+  }
+#endif
+
+  token = get_directive_token (pfile);
+
+  if (token == CPP_STRING) {
+    U_CHAR *fname = pfile->token_buffer + old_written;
+    U_CHAR *end_name;
+    static HASHNODE *fname_table[FNAME_HASHSIZE];
+    HASHNODE *hp, **hash_bucket;
+    U_CHAR *p;
+    long num_start;
+    int fname_length;
+
+    /* Turn the file name, which is a character string literal,
+       into a null-terminated string.  Do this in place.  */
+    end_name = convert_string (pfile, fname, fname, CPP_PWRITTEN (pfile), 1);
+    if (end_name == NULL)
+    {
+	cpp_error (pfile, "invalid format `#line' command");
+	goto bad_line_directive;
+    }
+
+    fname_length = end_name - fname;
+
+    num_start = CPP_WRITTEN (pfile);
+    token = get_directive_token (pfile);
+    if (token != CPP_VSPACE && token != CPP_EOF && token != CPP_POP) {
+      p = pfile->token_buffer + num_start;
+      if (CPP_PEDANTIC (pfile))
+	cpp_pedwarn (pfile, "garbage at end of `#line' command");
+
+      if (token != CPP_NUMBER || *p < '0' || *p > '4' || p[1] != '\0')
+      {
+	cpp_error (pfile, "invalid format `#line' command");
+	goto bad_line_directive;
+      }
+      if (*p == '1')
+	file_change = enter_file;
+      else if (*p == 2)
+	file_change = leave_file;
+      else if (*p == 3)
+	ip->system_header_p = 1;
+      else /* if (*p == 4) */
+	ip->system_header_p = 2;
+
+      CPP_SET_WRITTEN (pfile, num_start);
+      token = get_directive_token (pfile);
+      p = pfile->token_buffer + num_start;
+      if (token == CPP_NUMBER && p[1] == '\0' && (*p == '3' || *p== '4')) {
+	ip->system_header_p = *p == 3 ? 1 : 2;
+	token = get_directive_token (pfile);
+      }
+      if (token != CPP_VSPACE) {
+	cpp_error (pfile, "invalid format `#line' command");
+	goto bad_line_directive;
+      }
+    }
+
+    hash_bucket =
+      &fname_table[hashf (fname, fname_length, FNAME_HASHSIZE)];
+    for (hp = *hash_bucket; hp != NULL; hp = hp->next)
+      if (hp->length == fname_length &&
+	  strncmp (hp->value.cpval, fname, fname_length) == 0) {
+	ip->nominal_fname = hp->value.cpval;
+	break;
+      }
+    if (hp == 0) {
+      /* Didn't find it; cons up a new one.  */
+      hp = (HASHNODE *) xcalloc (1, sizeof (HASHNODE) + fname_length + 1);
+      hp->next = *hash_bucket;
+      *hash_bucket = hp;
+
+      hp->length = fname_length;
+      ip->nominal_fname = hp->value.cpval = ((char *) hp) + sizeof (HASHNODE);
+      bcopy (fname, hp->value.cpval, fname_length);
+    }
+  }
+  else if (token != CPP_VSPACE && token != CPP_EOF) {
+    cpp_error (pfile, "invalid format `#line' command");
+    goto bad_line_directive;
+  }
+
+  ip->lineno = new_lineno;
+ bad_line_directive:
+  skip_rest_of_line (pfile);
+  CPP_SET_WRITTEN (pfile, old_written);
+  output_line_command (pfile, 0, file_change);
+  return 0;
+}
+
+/*
+ * remove the definition of a symbol from the symbol table.
+ * according to un*x /lib/cpp, it is not an error to undef
+ * something that has no definitions, so it isn't one here either.
+ */
+
+static int
+do_undef (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  int sym_length;
+  HASHNODE *hp;
+  U_CHAR *orig_buf = buf;
+
+#if 0
+  /* If this is a precompiler run (with -pcp) pass thru #undef commands.  */
+  if (pcp_outfile && keyword)
+    pass_thru_directive (buf, limit, pfile, keyword);
+#endif
+
+  SKIP_WHITE_SPACE (buf);
+  sym_length = check_macro_name (pfile, buf, "macro");
+
+  while ((hp = cpp_lookup (pfile, buf, sym_length, -1)) != NULL)
+    {
+      /* If we are generating additional info for debugging (with -g) we
+	 need to pass through all effective #undef commands.  */
+      if (CPP_OPTIONS (pfile)->debug_output && keyword)
+	pass_thru_directive (orig_buf, limit, pfile, keyword);
+      if (hp->type != T_MACRO)
+	cpp_warning (pfile, "undefining `%s'", hp->name);
+      delete_macro (hp);
+    }
+
+  if (CPP_PEDANTIC (pfile)) {
+    buf += sym_length;
+    SKIP_WHITE_SPACE (buf);
+    if (buf != limit)
+      cpp_pedwarn (pfile, "garbage after `#undef' directive");
+  }
+  return 0;
+}
+
+/*
+ * Report an error detected by the program we are processing.
+ * Use the text of the line in the error message.
+ * (We use error because it prints the filename & line#.)
+ */
+
+static int
+do_error (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  int length = limit - buf;
+  U_CHAR *copy = (U_CHAR *) xmalloc (length + 1);
+  bcopy (buf, copy, length);
+  copy[length] = 0;
+  SKIP_WHITE_SPACE (copy);
+  cpp_error (pfile, "#error %s", copy);
+  return 0;
+}
+
+/*
+ * Report a warning detected by the program we are processing.
+ * Use the text of the line in the warning message, then continue.
+ * (We use error because it prints the filename & line#.)
+ */
+
+static int
+do_warning (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  int length = limit - buf;
+  U_CHAR *copy = (U_CHAR *) xmalloc (length + 1);
+  bcopy (buf, copy, length);
+  copy[length] = 0;
+  SKIP_WHITE_SPACE (copy);
+  cpp_warning (pfile, "#warning %s", copy);
+  return 0;
+}
+
+/* Remember the name of the current file being read from so that we can
+   avoid ever including it again.  */
+
+static int
+do_once (pfile)
+     cpp_reader *pfile;
+{
+  cpp_buffer *ip = NULL;
+  struct file_name_list *new;
+
+  for (ip = CPP_BUFFER (pfile); ; ip = CPP_PREV_BUFFER (ip))
+    {
+      if (ip == NULL)
+	return 0;
+      if (ip->fname != NULL)
+	break;
+    }
+
+    
+  new = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
+  new->next = pfile->dont_repeat_files;
+  pfile->dont_repeat_files = new;
+  new->fname = savestring (ip->fname);
+  new->control_macro = 0;
+  new->got_name_map = 0;
+  new->c_system_include_path = 0;
+
+  return 0;
+}
+
+/* #ident has already been copied to the output file, so just ignore it.  */
+
+static int
+do_ident (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+/*  long old_written = CPP_WRITTEN (pfile);*/
+  int len;
+
+  /* Allow #ident in system headers, since that's not user's fault.  */
+  if (CPP_PEDANTIC (pfile) && !CPP_BUFFER (pfile)->system_header_p)
+    cpp_pedwarn (pfile, "ANSI C does not allow `#ident'");
+
+  /* Leave rest of line to be read by later calls to cpp_get_token. */
+
+  return 0;
+}
+
+/* #pragma and its argument line have already been copied to the output file.
+   Just check for some recognized pragmas that need validation here.  */
+
+static int
+do_pragma (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  while (*buf == ' ' || *buf == '\t')
+    buf++;
+  if (!strncmp (buf, "once", 4)) {
+    /* Allow #pragma once in system headers, since that's not the user's
+       fault.  */
+    if (!CPP_BUFFER (pfile)->system_header_p)
+      cpp_warning (pfile, "`#pragma once' is obsolete");
+    do_once (pfile);
+  }
+
+  if (!strncmp (buf, "implementation", 14)) {
+    /* Be quiet about `#pragma implementation' for a file only if it hasn't
+       been included yet.  */
+    struct file_name_list *ptr;
+    U_CHAR *p = buf + 14, *fname, *inc_fname;
+    int fname_len;
+    SKIP_WHITE_SPACE (p);
+    if (*p == '\n' || *p != '\"')
+      return 0;
+
+    fname = p + 1;
+    p = (U_CHAR *) index (fname, '\"');
+    fname_len = p != NULL ? p - fname : strlen (fname);
+    
+    for (ptr = pfile->all_include_files; ptr; ptr = ptr->next) {
+      inc_fname = (U_CHAR *) rindex (ptr->fname, '/');
+      inc_fname = inc_fname ? inc_fname + 1 : (U_CHAR *) ptr->fname;
+      if (inc_fname && !strncmp (inc_fname, fname, fname_len))
+	cpp_warning (pfile,
+	   "`#pragma implementation' for `%s' appears after file is included",
+		     fname);
+    }
+  }
+
+  return 0;
+}
+
+#if 0
+/* This was a fun hack, but #pragma seems to start to be useful.
+   By failing to recognize it, we pass it through unchanged to cc1.  */
+
+/*
+ * the behavior of the #pragma directive is implementation defined.
+ * this implementation defines it as follows.
+ */
+
+static int
+do_pragma ()
+{
+  close (0);
+  if (open ("/dev/tty", O_RDONLY, 0666) != 0)
+    goto nope;
+  close (1);
+  if (open ("/dev/tty", O_WRONLY, 0666) != 1)
+    goto nope;
+  execl ("/usr/games/hack", "#pragma", 0);
+  execl ("/usr/games/rogue", "#pragma", 0);
+  execl ("/usr/new/emacs", "-f", "hanoi", "9", "-kill", 0);
+  execl ("/usr/local/emacs", "-f", "hanoi", "9", "-kill", 0);
+nope:
+  fatal ("You are in a maze of twisty compiler features, all different");
+}
+#endif
+
+/* Just ignore #sccs, on systems where we define it at all.  */
+
+static int
+do_sccs (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  if (CPP_PEDANTIC (pfile))
+    cpp_pedwarn (pfile, "ANSI C does not allow `#sccs'");
+  return 0;
+}
+
+/*
+ * handle #if command by
+ *   1) inserting special `defined' keyword into the hash table
+ *	that gets turned into 0 or 1 by special_symbol (thus,
+ *	if the luser has a symbol called `defined' already, it won't
+ *      work inside the #if command)
+ *   2) rescan the input into a temporary output buffer
+ *   3) pass the output buffer to the yacc parser and collect a value
+ *   4) clean up the mess left from steps 1 and 2.
+ *   5) call conditional_skip to skip til the next #endif (etc.),
+ *      or not, depending on the value from step 3.
+ */
+
+static int
+do_if (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  HOST_WIDE_INT value = eval_if_expression (pfile, buf, limit - buf);
+  conditional_skip (pfile, value == 0, T_IF, NULL_PTR);
+  return 0;
+}
+
+/*
+ * handle a #elif directive by not changing  if_stack  either.
+ * see the comment above do_else.
+ */
+
+static int
+do_elif (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack) {
+    cpp_error (pfile, "`#elif' not within a conditional");
+    return 0;
+  } else {
+    if (pfile->if_stack->type != T_IF && pfile->if_stack->type != T_ELIF) {
+      cpp_error (pfile, "`#elif' after `#else'");
+#if 0
+      fprintf (stderr, " (matches line %d", pfile->if_stack->lineno);
+#endif
+      if (pfile->if_stack->fname != NULL && CPP_BUFFER (pfile)->fname != NULL
+	  && strcmp (pfile->if_stack->fname,
+		     CPP_BUFFER (pfile)->nominal_fname) != 0)
+	fprintf (stderr, ", file %s", pfile->if_stack->fname);
+      fprintf (stderr, ")\n");
+    }
+    pfile->if_stack->type = T_ELIF;
+  }
+
+  if (pfile->if_stack->if_succeeded)
+    skip_if_group (pfile, 0);
+  else {
+    HOST_WIDE_INT value = eval_if_expression (pfile, buf, limit - buf);
+    if (value == 0)
+      skip_if_group (pfile, 0);
+    else {
+      ++pfile->if_stack->if_succeeded;	/* continue processing input */
+      output_line_command (pfile, 1, same_file);
+    }
+  }
+  return 0;
+}
+
+/*
+ * evaluate a #if expression in BUF, of length LENGTH,
+ * then parse the result as a C expression and return the value as an int.
+ */
+static HOST_WIDE_INT
+eval_if_expression (pfile, buf, length)
+     cpp_reader *pfile;
+     U_CHAR *buf;
+     int length;
+{
+  HASHNODE *save_defined;
+  HOST_WIDE_INT value;
+  long old_written = CPP_WRITTEN (pfile);
+
+  save_defined = install ("defined", -1, T_SPEC_DEFINED, 0, 0, -1);
+  pfile->pcp_inside_if = 1;
+
+  value = cpp_parse_expr (pfile);
+  pfile->pcp_inside_if = 0;
+  delete_macro (save_defined);	/* clean up special symbol */
+
+  CPP_SET_WRITTEN (pfile, old_written); /* Pop */
+
+  return value;
+}
+
+/*
+ * routine to handle ifdef/ifndef.  Try to look up the symbol,
+ * then do or don't skip to the #endif/#else/#elif depending
+ * on what directive is actually being processed.
+ */
+
+static int
+do_xifdef (pfile, keyword, unused1, unused2)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *unused1, *unused2;
+{
+  int skip;
+  cpp_buffer *ip = CPP_BUFFER (pfile);
+  U_CHAR* ident;
+  int ident_length;
+  enum cpp_token token;
+  int start_of_file = 0;
+  U_CHAR *control_macro = 0;
+  int old_written = CPP_WRITTEN (pfile);
+
+  /* Detect a #ifndef at start of file (not counting comments).  */
+  if (ip->fname != 0 && keyword->type == T_IFNDEF)
+    start_of_file = pfile->only_seen_white == 2;
+
+  pfile->no_macro_expand++;
+  token = get_directive_token (pfile);
+  pfile->no_macro_expand--;
+
+  ident = pfile->token_buffer + old_written;
+  ident_length = CPP_WRITTEN (pfile) - old_written;
+  CPP_SET_WRITTEN (pfile, old_written); /* Pop */
+
+  if (token == CPP_VSPACE || token == CPP_POP || token == CPP_EOF)
+    {
+      skip = (keyword->type == T_IFDEF);
+      if (! CPP_TRADITIONAL (pfile))
+	cpp_pedwarn (pfile, "`#%s' with no argument", keyword->name);
+    }
+  else if (token == CPP_NAME)
+    {
+      HASHNODE *hp = cpp_lookup (pfile, ident, ident_length, -1);
+      skip = (hp == NULL) ^ (keyword->type == T_IFNDEF);
+      if (start_of_file && !skip)
+	{
+	  control_macro = (U_CHAR *) xmalloc (ident_length + 1);
+	  bcopy (ident, control_macro, ident_length + 1);
+	}
+    }
+  else
+    {
+      skip = (keyword->type == T_IFDEF);
+      if (! CPP_TRADITIONAL (pfile))
+	cpp_error (pfile, "`#%s' with invalid argument", keyword->name);
+    }
+
+  if (!CPP_TRADITIONAL (pfile))
+    { int c;
+      cpp_skip_hspace (pfile);
+      c = PEEKC ();
+      if (c != EOF && c != '\n')
+	cpp_pedwarn (pfile, "garbage at end of `#%s' argument", keyword->name);
+    }
+  skip_rest_of_line (pfile);
+
+#if 0
+    if (pcp_outfile) {
+      /* Output a precondition for this macro.  */
+      if (hp && hp->value.defn->predefined)
+	fprintf (pcp_outfile, "#define %s\n", hp->name);
+      else {
+	U_CHAR *cp = buf;
+	fprintf (pcp_outfile, "#undef ");
+	while (is_idchar[*cp]) /* Ick! */
+	  fputc (*cp++, pcp_outfile);
+	putc ('\n', pcp_outfile);
+      }
+#endif
+
+  conditional_skip (pfile, skip, T_IF, control_macro);
+  return 0;
+}
+
+/* Push TYPE on stack; then, if SKIP is nonzero, skip ahead.
+   If this is a #ifndef starting at the beginning of a file,
+   CONTROL_MACRO is the macro name tested by the #ifndef.
+   Otherwise, CONTROL_MACRO is 0.  */
+
+static void
+conditional_skip (pfile, skip, type, control_macro)
+     cpp_reader *pfile;
+     int skip;
+     enum node_type type;
+     U_CHAR *control_macro;
+{
+  IF_STACK_FRAME *temp;
+
+  temp = (IF_STACK_FRAME *) xcalloc (1, sizeof (IF_STACK_FRAME));
+  temp->fname = CPP_BUFFER (pfile)->nominal_fname;
+#if 0
+  temp->lineno = CPP_BUFFER (pfile)->lineno;
+#endif
+  temp->next = pfile->if_stack;
+  temp->control_macro = control_macro;
+  pfile->if_stack = temp;
+
+  pfile->if_stack->type = type;
+
+  if (skip != 0) {
+    skip_if_group (pfile, 0);
+    return;
+  } else {
+    ++pfile->if_stack->if_succeeded;
+    output_line_command (pfile, 1, same_file);
+  }
+}
+
+/*
+ * skip to #endif, #else, or #elif.  adjust line numbers, etc.
+ * leaves input ptr at the sharp sign found.
+ * If ANY is nonzero, return at next directive of any sort.
+ */
+static void
+skip_if_group (pfile, any)
+     cpp_reader *pfile;
+     int any;
+{
+  int c;
+  int at_beg_of_line = 1;
+  struct directive *kt;
+  IF_STACK_FRAME *save_if_stack = pfile->if_stack; /* don't pop past here */
+#if 0
+  U_CHAR *beg_of_line = bp;
+#endif
+  register int ident_length;
+  U_CHAR *ident, *after_ident;
+  struct parse_marker line_start_mark;
+
+  parse_set_mark (&line_start_mark, pfile);
+
+  if (CPP_OPTIONS (pfile)->output_conditionals) {
+    static char failed[] = "#failed\n";
+    CPP_PUTS (pfile, failed, sizeof(failed)-1);
+    pfile->lineno++;
+    output_line_command (pfile, 1, same_file);
+  }
+
+ beg_of_line:
+  if (CPP_OPTIONS (pfile)->output_conditionals)
+    {
+      cpp_buffer *pbuf = CPP_BUFFER (pfile);
+      U_CHAR *start_line = pbuf->buf + line_start_mark.position;
+      CPP_PUTS (pfile, start_line, pbuf->cur - start_line);
+    }
+  parse_move_mark (&line_start_mark, pfile);
+  if (!CPP_TRADITIONAL (pfile))
+      cpp_skip_hspace (pfile);
+  c  = GETC();
+  if (c == '#')
+    {
+      int old_written = CPP_WRITTEN (pfile);
+      cpp_skip_hspace (pfile);
+
+      parse_name (pfile, GETC());
+      ident_length = CPP_WRITTEN (pfile) - old_written;
+      ident = pfile->token_buffer + old_written;
+      pfile->limit = ident;
+#if 0
+      if (ident_length == 0)
+	goto not_a_directive;
+
+      /* Handle # followed by a line number.  */
+
+      /* Avoid error for `###' and similar cases unless -pedantic.  */
+#endif
+
+      for (kt = directive_table; kt->length >= 0; kt++)
+	{
+	  IF_STACK_FRAME *temp;
+	  if (ident_length == kt->length
+	      && strncmp (ident, kt->name, kt->length) == 0)
+	    {
+	      /* If we are asked to return on next directive, do so now.  */
+	      if (any)
+		goto done;
+
+	      switch (kt->type)
+		{
+		case T_IF:
+		case T_IFDEF:
+		case T_IFNDEF:
+		  temp
+		    = (IF_STACK_FRAME *) xcalloc (1, sizeof (IF_STACK_FRAME));
+		  temp->next = pfile->if_stack;
+		  pfile->if_stack = temp;
+#if 0
+		  temp->lineno = CPP_BUFFER(pfile)->lineno;
+#endif
+		  temp->fname = CPP_BUFFER(pfile)->nominal_fname;
+		  temp->type = kt->type;
+		  break;
+		case T_ELSE:
+		case T_ENDIF:
+		  if (CPP_PEDANTIC (pfile) && pfile->if_stack != save_if_stack)
+		    validate_else (pfile,
+				   kt->type == T_ELSE ? "#else" : "#endif");
+		case T_ELIF:
+		  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack)
+		    {
+		      cpp_error (pfile,
+				 "`#%s' not within a conditional", kt->name);
+		      break;
+		    }
+		  else if (pfile->if_stack == save_if_stack)
+		    goto done;		/* found what we came for */
+
+		  if (kt->type != T_ENDIF)
+		    {
+		      if (pfile->if_stack->type == T_ELSE)
+			cpp_error (pfile, "`#else' or `#elif' after `#else'");
+		      pfile->if_stack->type = kt->type;
+		      break;
+		    }
+
+		  temp = pfile->if_stack;
+		  pfile->if_stack = temp->next;
+		  free (temp);
+		  break;
+	      default: ;
+		}
+	      break;
+	    }
+	  /* Don't let erroneous code go by.  */
+	  if (kt->length < 0 && !CPP_OPTIONS (pfile)->lang_asm
+	      && CPP_PEDANTIC (pfile))
+	    cpp_pedwarn (pfile, "invalid preprocessor directive name");
+	}
+      c = GETC ();
+    }
+  /* We're in the middle of a line.  Skip the rest of it. */
+  for (;;) {
+    switch (c)
+      {
+	long old;
+      case EOF:
+	goto done;
+      case '/':			/* possible comment */
+	c = skip_comment (pfile, NULL);
+	if (c == EOF)
+	  goto done;
+	break;
+      case '\"':
+      case '\'':
+	FORWARD(-1);
+	old = CPP_WRITTEN (pfile);
+	cpp_get_token (pfile);
+	CPP_SET_WRITTEN (pfile, old);
+	break;
+      case '\\':
+	/* Char after backslash loses its special meaning.  */
+	if (PEEKC() == '\n')
+	  FORWARD (1);
+	break;
+      case '\n':
+	goto beg_of_line;
+	break;
+      }
+    c = GETC ();
+  }
+ done:
+  if (CPP_OPTIONS (pfile)->output_conditionals) {
+    static char end_failed[] = "#endfailed\n";
+    CPP_PUTS (pfile, end_failed, sizeof(end_failed)-1);
+    pfile->lineno++;
+  }
+  pfile->only_seen_white = 1;
+  parse_goto_mark (&line_start_mark, pfile);
+  parse_clear_mark (&line_start_mark);
+}
+
+/*
+ * handle a #else directive.  Do this by just continuing processing
+ * without changing  if_stack ;  this is so that the error message
+ * for missing #endif's etc. will point to the original #if.  It
+ * is possible that something different would be better.
+ */
+
+static int
+do_else (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  cpp_buffer *ip = CPP_BUFFER (pfile);
+
+  if (CPP_PEDANTIC (pfile))
+    validate_else (pfile, "#else");
+  skip_rest_of_line (pfile);
+
+  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack) {
+    cpp_error (pfile, "`#else' not within a conditional");
+    return 0;
+  } else {
+    /* #ifndef can't have its special treatment for containing the whole file
+       if it has a #else clause.  */
+    pfile->if_stack->control_macro = 0;
+
+    if (pfile->if_stack->type != T_IF && pfile->if_stack->type != T_ELIF) {
+      cpp_error (pfile, "`#else' after `#else'");
+      fprintf (stderr, " (matches line %d", pfile->if_stack->lineno);
+      if (strcmp (pfile->if_stack->fname, ip->nominal_fname) != 0)
+	fprintf (stderr, ", file %s", pfile->if_stack->fname);
+      fprintf (stderr, ")\n");
+    }
+    pfile->if_stack->type = T_ELSE;
+  }
+
+  if (pfile->if_stack->if_succeeded)
+    skip_if_group (pfile, 0);
+  else {
+    ++pfile->if_stack->if_succeeded;	/* continue processing input */
+    output_line_command (pfile, 1, same_file);
+  }
+  return 0;
+}
+
+/*
+ * unstack after #endif command
+ */
+
+static int
+do_endif (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  if (CPP_PEDANTIC (pfile))
+    validate_else (pfile, "#endif");
+  skip_rest_of_line (pfile);
+
+  if (pfile->if_stack == CPP_BUFFER (pfile)->if_stack)
+    cpp_error (pfile, "unbalanced `#endif'");
+  else
+    {
+      IF_STACK_FRAME *temp = pfile->if_stack;
+      pfile->if_stack = temp->next;
+      if (temp->control_macro != 0)
+	{
+	  /* This #endif matched a #ifndef at the start of the file.
+	     See if it is at the end of the file.  */
+	  struct parse_marker start_mark;
+	  int c;
+
+	  parse_set_mark (&start_mark, pfile);
+
+	  for (;;)
+	    {
+	      cpp_skip_hspace (pfile);
+	      c = GETC ();
+	      if (c != '\n')
+		break;
+	    }
+	  parse_goto_mark (&start_mark, pfile);
+	  parse_clear_mark (&start_mark);
+
+	  if (c == EOF)
+	    {
+	      /* If we get here, this #endif ends a #ifndef
+		 that contains all of the file (aside from whitespace).
+		 Arrange not to include the file again
+		 if the macro that was tested is defined.
+
+		 Do not do this for the top-level file in a -include or any
+		 file in a -imacros.  */
+#if 0
+FIXME!
+	      if (indepth != 0
+		  && ! (indepth == 1 && pfile->no_record_file)
+		  && ! (pfile->no_record_file && no_output))
+#endif
+		{
+		  struct file_name_list *ifile = pfile->all_include_files;
+		  
+		  for ( ; ifile != NULL; ifile = ifile->next)
+		    {
+		      if (!strcmp (ifile->fname, CPP_BUFFER (pfile)->fname))
+			{
+			  ifile->control_macro = temp->control_macro;
+			  break;
+			}
+		    }
+		}
+	    }
+        }
+      free (temp);
+      output_line_command (pfile, 1, same_file);
+    }
+  return 0;
+}
+
+/* When an #else or #endif is found while skipping failed conditional,
+   if -pedantic was specified, this is called to warn about text after
+   the command name.  P points to the first char after the command name.  */
+
+static void
+validate_else (pfile, directive)
+     cpp_reader *pfile;
+     char *directive;
+{
+  int c;
+  cpp_skip_hspace (pfile);
+  c = PEEKC ();
+  if (c != EOF && c != '\n')
+    cpp_pedwarn (pfile,
+		 "text following `%s' violates ANSI standard", directive);
+}
+
+/* Get the next token, and add it to the text in pfile->token_buffer.
+   Return the kind of token we got. */
+  
+
+enum cpp_token
+cpp_get_token (pfile)
+     cpp_reader *pfile;
+{
+  register int c, c2, c3;
+  long old_written;
+  long start_line, start_column;
+  enum cpp_token token;
+  struct cpp_options *opts = CPP_OPTIONS (pfile);
+  CPP_BUFFER (pfile)->prev = CPP_BUFFER (pfile)->cur;
+ get_next:
+  c = GETC();
+  if (c == EOF)
+    {
+    handle_eof:
+      if (CPP_BUFFER (pfile)->seen_eof)
+	{
+	  if (cpp_pop_buffer (pfile) != CPP_NULL_BUFFER (pfile))
+	    goto get_next;
+	  else
+	    return CPP_EOF;
+	}
+      else
+	{
+	  cpp_buffer *next_buf
+	    = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
+	  CPP_BUFFER (pfile)->seen_eof = 1;
+	  if (CPP_BUFFER (pfile)->nominal_fname && next_buf != 0)
+	    {
+	      /* We're about to return from an #include file.
+		 Emit #line information now (as part of the CPP_POP) result.
+		 But the #line refers to the file we will pop to. */
+	      cpp_buffer *cur_buffer = CPP_BUFFER (pfile);
+	      CPP_BUFFER (pfile) = next_buf;
+	      pfile->input_stack_listing_current = 0;
+	      output_line_command (pfile, 0, leave_file);
+	      CPP_BUFFER (pfile) = cur_buffer;
+	    }
+	  return CPP_POP;
+	}
+    }
+  else
+    {
+      switch (c)
+	{
+	  long newlines;
+	  struct parse_marker start_mark;
+	case '/':
+	  if (PEEKC () == '=')
+	    goto op2;
+	  if (opts->put_out_comments)
+	    parse_set_mark (&start_mark, pfile);
+	  newlines = 0;
+	  cpp_buf_line_and_col (cpp_file_buffer (pfile),
+				&start_line, &start_column);
+	  c = skip_comment (pfile, &newlines);
+	  if (opts->put_out_comments && (c == '/' || c == EOF))
+	    parse_clear_mark (&start_mark);
+	  if (c == '/')
+	    goto randomchar;
+	  if (c == EOF)
+	    {
+	      cpp_error_with_line (pfile, start_line, start_column,
+				   "unterminated comment");
+	      goto handle_eof;
+	    }
+	  c = '/';  /* Initial letter of comment. */
+	return_comment:
+	  /* Comments are equivalent to spaces.
+	     For -traditional, a comment is equivalent to nothing.  */
+	  if (opts->put_out_comments)
+	    {
+	      cpp_buffer *pbuf = CPP_BUFFER (pfile);
+	      long dummy;
+	      U_CHAR *start = pbuf->buf + start_mark.position;
+	      int len = pbuf->cur - start;
+	      CPP_RESERVE(pfile, 1 + len);
+	      CPP_PUTC_Q (pfile, c);
+	      CPP_PUTS_Q (pfile, start, len);
+	      pfile->lineno += newlines;
+	      parse_clear_mark (&start_mark);
+	      return CPP_COMMENT;
+	    }
+	  else if (CPP_TRADITIONAL (pfile))
+	    {
+	      return CPP_COMMENT;
+	    }
+	  else
+	    {
+#if 0
+	      /* This may not work if cpp_get_token is called recursively,
+		 since many places look for horizontal space. */
+	      if (newlines)
+		{
+		  /* Copy the newlines into the output buffer, in order to
+		     avoid the pain of a #line every time a multiline comment
+		     is seen.  */
+		  CPP_RESERVE(pfile, newlines);
+		  while (--newlines >= 0)
+		    {
+		      CPP_PUTC_Q (pfile, '\n');
+		      pfile->lineno++;
+		    }
+		  return CPP_VSPACE;
+		}
+#endif
+	      CPP_RESERVE(pfile, 1);
+	      CPP_PUTC_Q (pfile, ' ');
+	      return CPP_HSPACE;
+	    }
+#if 0
+	  if (opts->for_lint) {
+	    U_CHAR *argbp;
+	    int cmdlen, arglen;
+	    char *lintcmd = get_lintcmd (ibp, limit, &argbp, &arglen, &cmdlen);
+	    
+	    if (lintcmd != NULL) {
+	      /* I believe it is always safe to emit this newline: */
+	      obp[-1] = '\n';
+	      bcopy ("#pragma lint ", (char *) obp, 13);
+	      obp += 13;
+	      bcopy (lintcmd, (char *) obp, cmdlen);
+	      obp += cmdlen;
+
+	      if (arglen != 0) {
+		*(obp++) = ' ';
+		bcopy (argbp, (char *) obp, arglen);
+		obp += arglen;
+	      }
+
+	      /* OK, now bring us back to the state we were in before we entered
+		 this branch.  We need #line b/c the newline for the pragma
+		 could fuck things up. */
+	      output_line_command (pfile, 0, same_file);
+	      *(obp++) = ' ';	/* just in case, if comments are copied thru */
+	      *(obp++) = '/';
+	    }
+	  }
+#endif
+
+	case '#':
+#if 0
+	  /* If this is expanding a macro definition, don't recognize
+	     preprocessor directives.  */
+	  if (ip->macro != 0)
+	    goto randomchar;
+	  /* If this is expand_into_temp_buffer, recognize them
+	     only after an actual newline at this level,
+	     not at the beginning of the input level.  */
+	  if (ip->fname == 0 && beg_of_line == ip->buf)
+	    goto randomchar;
+	  if (ident_length)
+	    goto specialchar;
+#endif
+
+	  if (!pfile->only_seen_white)
+	    goto randomchar;
+	  if (handle_directive (pfile))
+	    return CPP_DIRECTIVE;
+	  pfile->only_seen_white = 0;
+	  return CPP_OTHER;
+
+	case '\"':
+	case '\'':
+	  /* A single quoted string is treated like a double -- some
+	     programs (e.g., troff) are perverse this way */
+	  cpp_buf_line_and_col (cpp_file_buffer (pfile),
+				&start_line, &start_column);
+	  old_written = CPP_WRITTEN (pfile);
+	string:
+	  CPP_PUTC (pfile, c);
+	  while (1)
+	    {
+	      int cc = GETC();
+	      if (cc == EOF)
+		{
+		  if (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
+		    {
+		      /* try harder: this string crosses a macro expansion
+			 boundary.  This can happen naturally if -traditional.
+			 Otherwise, only -D can make a macro with an unmatched
+			 quote.  */
+			cpp_buffer *next_buf
+			    = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
+			(*CPP_BUFFER (pfile)->cleanup)
+			    (CPP_BUFFER (pfile), pfile);
+			CPP_BUFFER (pfile) = next_buf;
+			continue;
+		    }
+		  if (!CPP_TRADITIONAL (pfile))
+		    {
+		      cpp_error_with_line (pfile, start_line, start_column,
+			      "unterminated string or character constant");
+		      if (pfile->multiline_string_line != start_line
+			  && pfile->multiline_string_line != 0)
+			cpp_error_with_line (pfile,
+					     pfile->multiline_string_line, -1,
+			       "possible real start of unterminated constant");
+		      pfile->multiline_string_line = 0;
+		    }
+		  break;
+		}
+	      CPP_PUTC (pfile, cc);
+	      switch (cc)
+		{
+		case '\n':
+		  /* Traditionally, end of line ends a string constant with
+		 no error.  So exit the loop and record the new line.  */
+		  if (CPP_TRADITIONAL (pfile))
+		    goto while2end;
+		  if (c == '\'')
+		    {
+		      cpp_error_with_line (pfile, start_line, start_column,
+					   "unterminated character constant");
+		      goto while2end;
+		    }
+		  if (CPP_PEDANTIC (pfile)
+		      && pfile->multiline_string_line == 0)
+		    {
+		      cpp_pedwarn_with_line (pfile, start_line, start_column,
+			       "string constant runs past end of line");
+		    }
+		  if (pfile->multiline_string_line == 0)
+		    pfile->multiline_string_line = start_line;
+		  break;
+		
+		case '\\':
+		  cc = GETC();
+		  if (cc == '\n')
+		    {
+		      /* Backslash newline is replaced by nothing at all. */
+		      CPP_ADJUST_WRITTEN (pfile, -1);
+		      pfile->lineno++;
+		    }
+		  else
+		    {
+		      /* ANSI stupidly requires that in \\ the second \
+			 is *not* prevented from combining with a newline.  */
+		      NEWLINE_FIX1(cc);
+		      if (cc != EOF)
+			CPP_PUTC (pfile, cc);
+		    }
+		  break;
+
+		case '\"':
+		case '\'':
+		  if (cc == c)
+		    goto while2end;
+		  break;
+		}
+	    }
+	while2end:
+	  pfile->lineno += count_newlines (pfile->token_buffer + old_written,
+					   CPP_PWRITTEN (pfile));
+	  pfile->only_seen_white = 0;
+	  return c == '\'' ? CPP_CHAR : CPP_STRING;
+
+	case '$':
+	  if (!opts->dollars_in_ident)
+	    goto randomchar;
+	  goto letter;
+
+	case ':':
+	  if (opts->cplusplus && PEEKC () == ':')
+	    goto op2;
+	  goto randomchar;
+
+	case '&':
+	case '+':
+	case '|':
+	  NEWLINE_FIX;
+	  c2 = PEEKC ();
+	  if (c2 == c || c2 == '=')
+	    goto op2;
+	  goto randomchar;
+
+	case '*':
+	case '!':
+	case '%':
+	case '=':
+	case '^':
+	  NEWLINE_FIX;
+	  if (PEEKC () == '=')
+	    goto op2;
+	  goto randomchar;
+
+	case '-':
+	  NEWLINE_FIX;
+	  c2 = PEEKC ();
+	  if (c2 == '-' && opts->chill)
+	    {
+	      /* Chill style comment */
+	      if (opts->put_out_comments)
+		parse_set_mark (&start_mark, pfile);
+	      FORWARD(1);  /* Skip second '-'. */
+	      for (;;)
+		{
+		  c = GETC ();
+		  if (c == EOF)
+		    break;
+		  if (c == '\n')
+		    {
+		      /* Don't consider final '\n' to be part of comment. */
+		      FORWARD(-1);
+		      break;
+		    }
+		}
+	      c = '-';
+	      goto return_comment;
+	    }
+	  if (c2 == '-' || c2 == '=' || c2 == '>')
+	    goto op2;
+	  goto randomchar;
+
+	case '<':
+	  if (pfile->parsing_include_directive)
+	    {
+	      for (;;)
+		{
+		  CPP_PUTC (pfile, c);
+		  if (c == '>')
+		    break;
+		  c = GETC ();
+		  NEWLINE_FIX1 (c);
+		  if (c == '\n' || c == EOF)
+		    {
+		      cpp_error (pfile,
+				 "missing '>' in `#include <FILENAME>'");
+		      break;
+		    }
+		}
+	      return CPP_STRING;
+	    }
+	  /* else fall through */
+	case '>':
+	  NEWLINE_FIX;
+	  c2 = PEEKC ();
+	  if (c2 == '=')
+	    goto op2;
+	  if (c2 != c)
+	    goto randomchar;
+	  FORWARD(1);
+	  CPP_RESERVE (pfile, 4);
+	  CPP_PUTC (pfile, c);
+	  CPP_PUTC (pfile, c2);
+	  NEWLINE_FIX;
+	  c3 = PEEKC ();
+	  if (c3 == '=')
+	    CPP_PUTC_Q (pfile, GETC ());
+	  CPP_NUL_TERMINATE_Q (pfile);
+	  pfile->only_seen_white = 0;
+	  return CPP_OTHER;
+
+	case '@':
+	  if (CPP_BUFFER (pfile)->has_escapes)
+	    {
+	      c = GETC ();
+	      if (c == '-')
+		{
+		  if (pfile->output_escapes)
+		    CPP_PUTS (pfile, "@-", 2);
+		  parse_name (pfile, GETC ());
+		  return CPP_NAME;
+		}
+	      else if (is_space [c])
+		{
+		  CPP_RESERVE (pfile, 2);
+		  if (pfile->output_escapes)
+		    CPP_PUTC_Q (pfile, '@');
+		  CPP_PUTC_Q (pfile, c);
+		  return CPP_HSPACE;
+		}
+	    }
+	  if (pfile->output_escapes)
+	    {
+	      CPP_PUTS (pfile, "@@", 2);
+	      return CPP_OTHER;
+	    }
+	  goto randomchar;
+
+	case '.':
+	  NEWLINE_FIX;
+	  c2 = PEEKC ();
+	  if (isdigit(c2))
+	    {
+	      CPP_RESERVE(pfile, 2);
+	      CPP_PUTC_Q (pfile, '.');
+	      c = GETC ();
+	      goto number;
+	    }
+	  /* FIXME - misses the case "..\\\n." */
+	  if (c2 == '.' && PEEKN(1) == '.')
+	    {
+	      CPP_RESERVE(pfile, 4);
+	      CPP_PUTC_Q (pfile, '.');
+	      CPP_PUTC_Q (pfile, '.');
+	      CPP_PUTC_Q (pfile, '.');
+	      FORWARD (2);
+	      CPP_NUL_TERMINATE_Q (pfile);
+	      pfile->only_seen_white = 0;
+	      return CPP_3DOTS;
+	    }
+	  goto randomchar;
+
+	op2:
+	  token = CPP_OTHER;
+	  pfile->only_seen_white = 0;
+        op2any:
+	  CPP_RESERVE(pfile, 3);
+	  CPP_PUTC_Q (pfile, c);
+	  CPP_PUTC_Q (pfile, GETC ());
+	  CPP_NUL_TERMINATE_Q (pfile);
+	  return token;
+
+	case 'L':
+	  NEWLINE_FIX;
+	  c2 = PEEKC ();
+	  if ((c2 == '\'' || c2 == '\"') && !CPP_TRADITIONAL (pfile))
+	    {
+	      CPP_PUTC (pfile, c);
+	      c = GETC ();
+	      goto string;
+	    }
+	  goto letter;
+
+	case '0': case '1': case '2': case '3': case '4':
+	case '5': case '6': case '7': case '8': case '9':
+	number:
+	  c2  = '.';
+	  for (;;)
+	    {
+	      CPP_RESERVE (pfile, 2);
+	      CPP_PUTC_Q (pfile, c);
+	      NEWLINE_FIX;
+	      c = PEEKC ();
+	      if (c == EOF)
+		break;
+	      if (!is_idchar[c] && c != '.'
+		  && ((c2 != 'e' && c2 != 'E') || (c != '+' && c != '-')))
+		break;
+	      FORWARD(1);
+	      c2= c;
+	    }
+	  CPP_NUL_TERMINATE_Q (pfile);
+	  pfile->only_seen_white = 0;
+	  return CPP_NUMBER;
+	case 'b': case 'c': case 'd': case 'h': case 'o':
+	case 'B': case 'C': case 'D': case 'H': case 'O':
+	  if (opts->chill && PEEKC () == '\'')
+	    {
+	      pfile->only_seen_white = 0;
+	      CPP_RESERVE (pfile, 2);
+	      CPP_PUTC_Q (pfile, c);
+	      CPP_PUTC_Q (pfile, '\'');
+	      FORWARD(1);
+	      for (;;)
+		{
+		  c = GETC();
+		  if (c == EOF)
+		    goto chill_number_eof;
+		  if (!is_idchar[c])
+		    {
+		      if (c == '\\' && PEEKC() == '\n')
+			{
+			  FORWARD(2);
+			  continue;
+			}
+		      break;
+		    }
+		  CPP_PUTC (pfile, c);
+		}
+	      if (c == '\'')
+		{
+		  CPP_RESERVE (pfile, 2);
+		  CPP_PUTC_Q (pfile, c);
+		  CPP_NUL_TERMINATE_Q (pfile);
+		  return CPP_STRING;
+		}
+	      else
+		{
+		  FORWARD(-1);
+		chill_number_eof:
+		  CPP_NUL_TERMINATE (pfile);
+		  return CPP_NUMBER;
+		}
+	    }
+	  else
+	    goto letter;
+	case '_':
+	case 'a': case 'e': case 'f': case 'g': case 'i': case 'j':
+	case 'k': case 'l': case 'm': case 'n': case 'p': case 'q':
+	case 'r': case 's': case 't': case 'u': case 'v': case 'w':
+	case 'x': case 'y': case 'z':
+	case 'A': case 'E': case 'F': case 'G': case 'I': case 'J':
+	case 'K': case 'M': case 'N': case 'P': case 'Q': case 'R':
+	case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+	case 'Y': case 'Z':
+        letter:
+          {
+	    HASHNODE *hp;
+	    unsigned char *ident;
+	    int before_name_written = CPP_WRITTEN (pfile);
+	    int ident_len;
+	    parse_name (pfile, c);
+	    pfile->only_seen_white = 0;
+	    if (pfile->no_macro_expand)
+	      return CPP_NAME;
+	    ident = pfile->token_buffer + before_name_written;
+	    ident_len = CPP_PWRITTEN (pfile) - ident;
+	    hp = cpp_lookup (pfile, ident, ident_len, -1);
+	    if (!hp)
+	      return CPP_NAME;
+	    if (hp->type == T_DISABLED)
+	      {
+		if (pfile->output_escapes)
+		  { /* Return "@-IDENT", followed by '\0'. */
+		    int i;
+		    CPP_RESERVE (pfile, 3);
+		    ident = pfile->token_buffer + before_name_written;
+		    CPP_ADJUST_WRITTEN (pfile, 2);
+		    for (i = ident_len; i >= 0; i--) ident[i+2] = ident[i];
+		    ident[0] = '@';
+		    ident[1] = '-';
+		  }
+		return CPP_NAME;
+	      }
+
+	    /* If macro wants an arglist, verify that a '(' follows.
+	       first skip all whitespace, copying it to the output
+	       after the macro name.  Then, if there is no '(',
+	       decide this is not a macro call and leave things that way.  */
+	    if (hp->type == T_MACRO && hp->value.defn->nargs >= 0)
+	    {
+	      struct parse_marker macro_mark;
+	      int is_macro_call;
+	      while (CPP_IS_MACRO_BUFFER (CPP_BUFFER (pfile)))
+	        {
+		  cpp_buffer *next_buf;
+		  cpp_skip_hspace (pfile);
+		  if (PEEKC () != EOF)
+		    break;
+		  next_buf = CPP_PREV_BUFFER (CPP_BUFFER (pfile));
+		  (*CPP_BUFFER (pfile)->cleanup) (CPP_BUFFER (pfile), pfile);
+		  CPP_BUFFER (pfile) = next_buf;
+	        }
+	      parse_set_mark (&macro_mark, pfile);
+	      for (;;)
+		{
+		  cpp_skip_hspace (pfile);
+		  c = PEEKC ();
+		  is_macro_call = c == '(';
+		  if (c != '\n')
+		    break;
+		  FORWARD (1);
+		}
+	      if (!is_macro_call)
+		parse_goto_mark (&macro_mark, pfile);
+	      parse_clear_mark (&macro_mark);
+	      if (!is_macro_call)
+		return CPP_NAME;
+	    }
+	    /* This is now known to be a macro call. */
+
+	    /* it might not actually be a macro.  */
+	    if (hp->type != T_MACRO) {
+	      int xbuf_len;  U_CHAR *xbuf;
+	      CPP_SET_WRITTEN (pfile, before_name_written);
+	      special_symbol (hp, pfile);
+	      xbuf_len = CPP_WRITTEN (pfile) - before_name_written;
+	      xbuf = (U_CHAR *) xmalloc (xbuf_len + 1);
+	      CPP_SET_WRITTEN (pfile, before_name_written);
+	      bcopy (CPP_PWRITTEN (pfile), xbuf, xbuf_len + 1);
+	      push_macro_expansion (pfile, xbuf, xbuf_len, hp);
+	    }
+	    else
+	      {
+		/* Expand the macro, reading arguments as needed,
+		   and push the expansion on the input stack.  */
+		macroexpand (pfile, hp);
+		CPP_SET_WRITTEN (pfile, before_name_written);
+	      }
+
+	    /* An extra "@ " is added to the end of a macro expansion
+	       to prevent accidental token pasting.  We prefer to avoid
+	       unneeded extra spaces (for the sake of cpp-using tools like
+	       imake).  Here we remove the space if it is safe to do so. */
+	    if (pfile->buffer->rlimit - pfile->buffer->cur >= 3
+		&& pfile->buffer->rlimit[-2] == '@'
+		&& pfile->buffer->rlimit[-1] == ' ')
+	      {
+		int c1 = pfile->buffer->rlimit[-3];
+		int c2 = CPP_BUF_PEEK (CPP_PREV_BUFFER (CPP_BUFFER (pfile)));
+		if (c2 == EOF || ! unsafe_chars (c1, c2))
+		  pfile->buffer->rlimit -= 2;
+	      }
+	  }
+	  goto get_next;
+
+	case ' ':  case '\t':  case '\v':  case '\r':
+	  for (;;)
+	    {
+	      CPP_PUTC (pfile, c);
+	      c = PEEKC ();
+	      if (c == EOF || !is_hor_space[c])
+		break;
+	      FORWARD(1);
+	    }
+	  return CPP_HSPACE;
+
+        case '\\':
+	  c2 = PEEKC ();
+	  if (c2 != '\n')
+	    goto randomchar;
+	  token = CPP_HSPACE;
+	  goto op2any;
+
+	case '\n':
+	  CPP_PUTC (pfile, c);
+	  if (pfile->only_seen_white == 0)
+	    pfile->only_seen_white = 1;
+	  pfile->lineno++;
+	  output_line_command (pfile, 1, same_file);
+	  return CPP_VSPACE;
+
+	case '(': token = CPP_LPAREN;    goto char1;
+	case ')': token = CPP_RPAREN;    goto char1;
+	case '{': token = CPP_LBRACE;    goto char1;
+	case '}': token = CPP_RBRACE;    goto char1;
+	case ',': token = CPP_COMMA;     goto char1;
+	case ';': token = CPP_SEMICOLON; goto char1;
+
+	randomchar:
+	default:
+	  token = CPP_OTHER;
+	char1:
+	  pfile->only_seen_white = 0;
+	  CPP_PUTC (pfile, c);
+	  return token;
+	}
+    }
+}
+
+/* Like cpp_get_token, but skip spaces and comments. */
+enum cpp_token
+cpp_get_non_space_token (pfile)
+     cpp_reader *pfile;
+{
+  int old_written = CPP_WRITTEN (pfile);
+  for (;;)
+    {
+      enum cpp_token token = cpp_get_token (pfile);
+      if (token != CPP_COMMENT && token != CPP_POP
+	  && token != CPP_HSPACE && token != CPP_VSPACE)
+	return token;
+      CPP_SET_WRITTEN (pfile, old_written);
+    }
+}
+
+/* Parse an identifier starting with C. */
+
+int
+parse_name (pfile, c)
+     cpp_reader *pfile; int c;
+{
+  for (;;)
+  {
+      if (! is_idchar[c])
+      {
+	  if (c == '\\' && PEEKC() == '\n')
+	  {
+	      FORWARD(2);
+	      continue;
+	  }
+	  FORWARD (-1);
+	  break;
+      }
+
+      CPP_RESERVE(pfile, 2); /* One more for final NUL. */
+      CPP_PUTC_Q (pfile, c);
+      c = GETC();
+      if (c == EOF)
+	break;
+  }
+  CPP_NUL_TERMINATE_Q (pfile);
+  return 1;
+}
+
+
+/* Maintain and search list of included files, for #import.  */
+
+/* Hash a file name for import_hash_table.  */
+
+static int 
+import_hash (f)
+     char *f;
+{
+  int val = 0;
+
+  while (*f) val += *f++;
+  return (val%IMPORT_HASH_SIZE);
+}
+
+/* Search for file FILENAME in import_hash_table.
+   Return -2 if found, either a matching name or a matching inode.
+   Otherwise, open the file and return a file descriptor if successful
+   or -1 if unsuccessful.  */
+
+static int
+lookup_import (pfile, filename, searchptr)
+     cpp_reader *pfile;
+     char *filename;
+     struct file_name_list *searchptr;
+{
+  struct import_file *i;
+  int h;
+  int hashval;
+  struct stat sb;
+  int fd;
+
+  hashval = import_hash (filename);
+
+  /* Attempt to find file in list of already included files */
+  i = pfile->import_hash_table[hashval];
+
+  while (i) {
+    if (!strcmp (filename, i->name))
+      return -2;		/* return found */
+    i = i->next;
+  }
+  /* Open it and try a match on inode/dev */
+  fd = open_include_file (pfile, filename, searchptr);
+  if (fd < 0)
+    return fd;
+  fstat (fd, &sb);
+  for (h = 0; h < IMPORT_HASH_SIZE; h++) {
+    i = pfile->import_hash_table[h];
+    while (i) {
+      /* Compare the inode and the device.
+	 Supposedly on some systems the inode is not a scalar.  */
+      if (!bcmp ((char *) &i->inode, (char *) &sb.st_ino, sizeof (sb.st_ino))
+	  && i->dev == sb.st_dev) {
+        close (fd);
+        return -2;		/* return found */
+      }
+      i = i->next;
+    }
+  }
+  return fd;			/* Not found, return open file */
+}
+
+/* Add the file FNAME, open on descriptor FD, to import_hash_table.  */
+
+static void
+add_import (pfile, fd, fname)
+     cpp_reader *pfile;
+     int fd;
+     char *fname;
+{
+  struct import_file *i;
+  int hashval;
+  struct stat sb;
+
+  hashval = import_hash (fname);
+  fstat (fd, &sb);
+  i = (struct import_file *)xmalloc (sizeof (struct import_file));
+  i->name = (char *)xmalloc (strlen (fname)+1);
+  strcpy (i->name, fname);
+  bcopy ((char *) &sb.st_ino, (char *) &i->inode, sizeof (sb.st_ino));
+  i->dev = sb.st_dev;
+  i->next = pfile->import_hash_table[hashval];
+  pfile->import_hash_table[hashval] = i;
+}
+
+/* The file_name_map structure holds a mapping of file names for a
+   particular directory.  This mapping is read from the file named
+   FILE_NAME_MAP_FILE in that directory.  Such a file can be used to
+   map filenames on a file system with severe filename restrictions,
+   such as DOS.  The format of the file name map file is just a series
+   of lines with two tokens on each line.  The first token is the name
+   to map, and the second token is the actual name to use.  */
+
+struct file_name_map
+{
+  struct file_name_map *map_next;
+  char *map_from;
+  char *map_to;
+};
+
+#define FILE_NAME_MAP_FILE "header.gcc"
+
+/* Read a space delimited string of unlimited length from a stdio
+   file.  */
+
+static char *
+read_filename_string (ch, f)
+     int ch;
+     FILE *f;
+{
+  char *alloc, *set;
+  int len;
+
+  len = 20;
+  set = alloc = xmalloc (len + 1);
+  if (! is_space[ch])
+    {
+      *set++ = ch;
+      while ((ch = getc (f)) != EOF && ! is_space[ch])
+	{
+	  if (set - alloc == len)
+	    {
+	      len *= 2;
+	      alloc = xrealloc (alloc, len + 1);
+	      set = alloc + len / 2;
+	    }
+	  *set++ = ch;
+	}
+    }
+  *set = '\0';
+  ungetc (ch, f);
+  return alloc;
+}
+
+/* This structure holds a linked list of file name maps, one per directory. */
+struct file_name_map_list
+{
+  struct file_name_map_list *map_list_next;
+  char *map_list_name;
+  struct file_name_map *map_list_map;
+};
+
+/* Read the file name map file for DIRNAME.  */
+
+static struct file_name_map *
+read_name_map (pfile, dirname)
+     cpp_reader *pfile;
+     char *dirname;
+{
+  register struct file_name_map_list *map_list_ptr;
+  char *name;
+  FILE *f;
+
+  for (map_list_ptr = CPP_OPTIONS (pfile)->map_list; map_list_ptr;
+       map_list_ptr = map_list_ptr->map_list_next)
+    if (! strcmp (map_list_ptr->map_list_name, dirname))
+      return map_list_ptr->map_list_map;
+
+  map_list_ptr = ((struct file_name_map_list *)
+		  xmalloc (sizeof (struct file_name_map_list)));
+  map_list_ptr->map_list_name = savestring (dirname);
+  map_list_ptr->map_list_map = NULL;
+
+  name = (char *) alloca (strlen (dirname) + strlen (FILE_NAME_MAP_FILE) + 2);
+  strcpy (name, dirname);
+  if (*dirname)
+    strcat (name, "/");
+  strcat (name, FILE_NAME_MAP_FILE);
+  f = fopen (name, "r");
+  if (!f)
+    map_list_ptr->map_list_map = NULL;
+  else
+    {
+      int ch;
+      int dirlen = strlen (dirname);
+
+      while ((ch = getc (f)) != EOF)
+	{
+	  char *from, *to;
+	  struct file_name_map *ptr;
+
+	  if (is_space[ch])
+	    continue;
+	  from = read_filename_string (ch, f);
+	  while ((ch = getc (f)) != EOF && is_hor_space[ch])
+	    ;
+	  to = read_filename_string (ch, f);
+
+	  ptr = ((struct file_name_map *)
+		 xmalloc (sizeof (struct file_name_map)));
+	  ptr->map_from = from;
+
+	  /* Make the real filename absolute.  */
+	  if (*to == '/')
+	    ptr->map_to = to;
+	  else
+	    {
+	      ptr->map_to = xmalloc (dirlen + strlen (to) + 2);
+	      strcpy (ptr->map_to, dirname);
+	      ptr->map_to[dirlen] = '/';
+	      strcpy (ptr->map_to + dirlen + 1, to);
+	      free (to);
+	    }	      
+
+	  ptr->map_next = map_list_ptr->map_list_map;
+	  map_list_ptr->map_list_map = ptr;
+
+	  while ((ch = getc (f)) != '\n')
+	    if (ch == EOF)
+	      break;
+	}
+      fclose (f);
+    }
+  
+  map_list_ptr->map_list_next = CPP_OPTIONS (pfile)->map_list;
+  CPP_OPTIONS (pfile)->map_list = map_list_ptr;
+
+  return map_list_ptr->map_list_map;
+}  
+
+/* Try to open include file FILENAME.  SEARCHPTR is the directory
+   being tried from the include file search path.  This function maps
+   filenames on file systems based on information read by
+   read_name_map.  */
+
+static int
+open_include_file (pfile, filename, searchptr)
+     cpp_reader *pfile;
+     char *filename;
+     struct file_name_list *searchptr;
+{
+  register struct file_name_map *map;
+  register char *from;
+  char *p, *dir;
+
+  if (searchptr && ! searchptr->got_name_map)
+    {
+      searchptr->name_map = read_name_map (pfile,
+					   searchptr->fname
+					   ? searchptr->fname : ".");
+      searchptr->got_name_map = 1;
+    }
+
+  /* First check the mapping for the directory we are using.  */
+  if (searchptr && searchptr->name_map)
+    {
+      from = filename;
+      if (searchptr->fname)
+	from += strlen (searchptr->fname) + 1;
+      for (map = searchptr->name_map; map; map = map->map_next)
+	{
+	  if (! strcmp (map->map_from, from))
+	    {
+	      /* Found a match.  */
+	      return open (map->map_to, O_RDONLY, 0666);
+	    }
+	}
+    }
+
+  /* Try to find a mapping file for the particular directory we are
+     looking in.  Thus #include <sys/types.h> will look up sys/types.h
+     in /usr/include/header.gcc and look up types.h in
+     /usr/include/sys/header.gcc.  */
+  p = rindex (filename, '/');
+  if (! p)
+    p = filename;
+  if (searchptr
+      && searchptr->fname
+      && strlen (searchptr->fname) == p - filename
+      && ! strncmp (searchptr->fname, filename, p - filename))
+    {
+      /* FILENAME is in SEARCHPTR, which we've already checked.  */
+      return open (filename, O_RDONLY, 0666);
+    }
+
+  if (p == filename)
+    {
+      dir = ".";
+      from = filename;
+    }
+  else
+    {
+      dir = (char *) alloca (p - filename + 1);
+      bcopy (filename, dir, p - filename);
+      dir[p - filename] = '\0';
+      from = p + 1;
+    }
+  for (map = read_name_map (pfile, dir); map; map = map->map_next)
+    if (! strcmp (map->map_from, from))
+      return open (map->map_to, O_RDONLY, 0666);
+
+  return open (filename, O_RDONLY, 0666);
+}
+
+/* Process the contents of include file FNAME, already open on descriptor F,
+   with output to OP.
+   SYSTEM_HEADER_P is 1 if this file resides in any one of the known
+   "system" include directories (as decided by the `is_system_include'
+   function above).
+   DIRPTR is the link in the dir path through which this file was found,
+   or 0 if the file name was absolute or via the current directory.
+   Return 1 on success, 0 on failure.
+
+   The caller is responsible for the cpp_push_buffer.  */
+
+static int
+finclude (pfile, f, fname, system_header_p, dirptr)
+     cpp_reader *pfile;
+     int f;
+     char *fname;
+     int system_header_p;
+     struct file_name_list *dirptr;
+{
+  int st_mode;
+  long st_size;
+  long i;
+  int length;
+  cpp_buffer *fp;			/* For input stack frame */
+  int missing_newline = 0;
+
+  if (file_size_and_mode (f, &st_mode, &st_size) < 0)
+    {
+      cpp_perror_with_name (pfile, fname);
+      close (f);
+      cpp_pop_buffer (pfile);
+      return 0;
+    }
+
+  fp = CPP_BUFFER (pfile);
+  fp->nominal_fname = fp->fname = fname;
+#if 0
+  fp->length = 0;
+#endif
+  fp->dir = dirptr;
+  fp->system_header_p = system_header_p;
+  fp->lineno = 1;
+  fp->colno = 1;
+  fp->cleanup = file_cleanup;
+
+  if (S_ISREG (st_mode)) {
+    fp->buf = (U_CHAR *) xmalloc (st_size + 2);
+    fp->alimit = fp->buf + st_size + 2;
+    fp->cur = fp->buf;
+
+    /* Read the file contents, knowing that st_size is an upper bound
+       on the number of bytes we can read.  */
+    length = safe_read (f, fp->buf, st_size);
+    fp->rlimit = fp->buf + length;
+    if (length < 0) goto nope;
+  }
+  else if (S_ISDIR (st_mode)) {
+    cpp_error (pfile, "directory `%s' specified in #include", fname);
+    close (f);
+    return 0;
+  } else {
+    /* Cannot count its file size before reading.
+       First read the entire file into heap and
+       copy them into buffer on stack. */
+
+    int bsize = 2000;
+
+    st_size = 0;
+    fp->buf = (U_CHAR *) xmalloc (bsize + 2);
+
+    for (;;) {
+      i = safe_read (f, fp->buf + st_size, bsize - st_size);
+      if (i < 0)
+	goto nope;      /* error! */
+      st_size += i;
+      if (st_size != bsize)
+	break;	/* End of file */
+      bsize *= 2;
+      fp->buf = (U_CHAR *) xrealloc (fp->buf, bsize + 2);
+    }
+    fp->cur = fp->buf;
+    length = st_size;
+  }
+
+  if ((length > 0 && fp->buf[length - 1] != '\n')
+      /* Backslash-newline at end is not good enough.  */
+      || (length > 1 && fp->buf[length - 2] == '\\')) {
+    fp->buf[length++] = '\n';
+#if 0
+    missing_newline = 1;
+#endif
+  }
+  fp->buf[length] = '\0';
+  fp->rlimit = fp->buf + length;
+
+  /* Close descriptor now, so nesting does not use lots of descriptors.  */
+  close (f);
+
+  /* Must do this before calling trigraph_pcp, so that the correct file name
+     will be printed in warning messages.  */
+
+  pfile->input_stack_listing_current = 0;
+
+#if 0
+  if (!no_trigraphs)
+    trigraph_pcp (fp);
+#endif
+
+#if 0
+  rescan (op, 0);
+
+  if (missing_newline)
+    fp->lineno--;
+
+  if (CPP_PEDANTIC (pfile) && missing_newline)
+    pedwarn ("file does not end in newline");
+
+  indepth--;
+  input_file_stack_tick++;
+  free (fp->buf);
+#endif
+  return 1;
+
+ nope:
+
+  cpp_perror_with_name (pfile, fname);
+  close (f);
+  free (fp->buf);
+  return 1;
+}
+
+int
+push_parse_file (pfile, fname)
+     cpp_reader *pfile;
+     char *fname;
+{
+  struct cpp_options *opts = CPP_OPTIONS (pfile);
+  struct cpp_pending *pend;
+  char *p;
+  int f;
+  cpp_buffer *fp;
+
+  /* The code looks at the defaults through this pointer, rather than through
+     the constant structure above.  This pointer gets changed if an environment
+     variable specifies other defaults.  */
+  struct default_include *include_defaults = include_defaults_array;
+
+  /* Add dirs from CPATH after dirs from -I.  */
+  /* There seems to be confusion about what CPATH should do,
+     so for the moment it is not documented.  */
+  /* Some people say that CPATH should replace the standard include dirs,
+     but that seems pointless: it comes before them, so it overrides them
+     anyway.  */
+  p = (char *) getenv ("CPATH");
+  if (p != 0 && ! opts->no_standard_includes)
+    path_include (pfile, p);
+
+  /* Now that dollars_in_ident is known, initialize is_idchar.  */
+  initialize_char_syntax (opts);
+
+  /* Do partial setup of input buffer for the sake of generating
+     early #line directives (when -g is in effect).  */
+  fp = cpp_push_buffer (pfile, NULL, 0);
+  if (opts->in_fname == NULL)
+    opts->in_fname = "";
+  fp->nominal_fname = fp->fname = opts->in_fname;
+  fp->lineno = 0;
+
+  /* Install __LINE__, etc.  Must follow initialize_char_syntax
+     and option processing.  */
+  initialize_builtins (pfile);
+
+  /* Do standard #defines and assertions
+     that identify system and machine type.  */
+
+  if (!opts->inhibit_predefs) {
+    char *p = (char *) alloca (strlen (predefs) + 1);
+    strcpy (p, predefs);
+    while (*p) {
+      char *q;
+      while (*p == ' ' || *p == '\t')
+	p++;
+      /* Handle -D options.  */ 
+      if (p[0] == '-' && p[1] == 'D') {
+	q = &p[2];
+	while (*p && *p != ' ' && *p != '\t')
+	  p++;
+	if (*p != 0)
+	  *p++= 0;
+	if (opts->debug_output)
+	  output_line_command (pfile, 0, same_file);
+	cpp_define (pfile, q);
+	while (*p == ' ' || *p == '\t')
+	  p++;
+      } else if (p[0] == '-' && p[1] == 'A') {
+	/* Handle -A options (assertions).  */ 
+	char *assertion;
+	char *past_name;
+	char *value;
+	char *past_value;
+	char *termination;
+	int save_char;
+
+	assertion = &p[2];
+	past_name = assertion;
+	/* Locate end of name.  */
+	while (*past_name && *past_name != ' '
+	       && *past_name != '\t' && *past_name != '(')
+	  past_name++;
+	/* Locate `(' at start of value.  */
+	value = past_name;
+	while (*value && (*value == ' ' || *value == '\t'))
+	  value++;
+	if (*value++ != '(')
+	  abort ();
+	while (*value && (*value == ' ' || *value == '\t'))
+	  value++;
+	past_value = value;
+	/* Locate end of value.  */
+	while (*past_value && *past_value != ' '
+	       && *past_value != '\t' && *past_value != ')')
+	  past_value++;
+	termination = past_value;
+	while (*termination && (*termination == ' ' || *termination == '\t'))
+	  termination++;
+	if (*termination++ != ')')
+	  abort ();
+	if (*termination && *termination != ' ' && *termination != '\t')
+	  abort ();
+	/* Temporarily null-terminate the value.  */
+	save_char = *termination;
+	*termination = '\0';
+	/* Install the assertion.  */
+	make_assertion (pfile, "-A", assertion);
+	*termination = (char) save_char;
+	p = termination;
+	while (*p == ' ' || *p == '\t')
+	  p++;
+      } else {
+	abort ();
+      }
+    }
+  }
+
+  /* Now handle the command line options.  */
+
+  /* Do -U's, -D's and -A's in the order they were seen.  */
+  /* First reverse the list. */
+  opts->pending = nreverse_pending (opts->pending);
+
+  for (pend = opts->pending;  pend;  pend = pend->next)
+    {
+      if (pend->cmd != NULL && pend->cmd[0] == '-')
+	{
+	  switch (pend->cmd[1])
+	    {
+	    case 'U':
+	      if (opts->debug_output)
+		output_line_command (pfile, 0, same_file);
+	      do_undef (pfile, NULL, pend->arg, pend->arg + strlen (pend->arg));
+	      break;
+	    case 'D':
+	      if (opts->debug_output)
+		output_line_command (pfile, 0, same_file);
+	      cpp_define (pfile, pend->arg);
+	      break;
+	    case 'A':
+	      make_assertion (pfile, "-A", pend->arg);
+	      break;
+	    }
+	}
+    }
+
+  opts->done_initializing = 1;
+
+  { /* read the appropriate environment variable and if it exists
+       replace include_defaults with the listed path. */
+    char *epath = 0;
+    switch ((opts->objc << 1) + opts->cplusplus)
+      {
+      case 0:
+	epath = getenv ("C_INCLUDE_PATH");
+	break;
+      case 1:
+	epath = getenv ("CPLUS_INCLUDE_PATH");
+	break;
+      case 2:
+	epath = getenv ("OBJC_INCLUDE_PATH");
+	break;
+      case 3:
+	epath = getenv ("OBJCPLUS_INCLUDE_PATH");
+	break;
+      }
+    /* If the environment var for this language is set,
+       add to the default list of include directories.  */
+    if (epath) {
+      char *nstore = (char *) alloca (strlen (epath) + 2);
+      int num_dirs;
+      char *startp, *endp;
+
+      for (num_dirs = 1, startp = epath; *startp; startp++)
+	if (*startp == PATH_SEPARATOR)
+	  num_dirs++;
+      include_defaults
+	= (struct default_include *) xmalloc ((num_dirs
+					       * sizeof (struct default_include))
+					      + sizeof (include_defaults_array));
+      startp = endp = epath;
+      num_dirs = 0;
+      while (1) {
+        /* Handle cases like c:/usr/lib:d:/gcc/lib */
+        if ((*endp == PATH_SEPARATOR)
+            || *endp == 0) {
+	  strncpy (nstore, startp, endp-startp);
+	  if (endp == startp)
+	    strcpy (nstore, ".");
+	  else
+	    nstore[endp-startp] = '\0';
+
+	  include_defaults[num_dirs].fname = savestring (nstore);
+	  include_defaults[num_dirs].cplusplus = opts->cplusplus;
+	  include_defaults[num_dirs].cxx_aware = 1;
+	  num_dirs++;
+	  if (*endp == '\0')
+	    break;
+	  endp = startp = endp + 1;
+	} else
+	  endp++;
+      }
+      /* Put the usual defaults back in at the end.  */
+      bcopy ((char *) include_defaults_array,
+	     (char *) &include_defaults[num_dirs],
+	     sizeof (include_defaults_array));
+    }
+  }
+
+  append_include_chain (pfile, opts->before_system, opts->last_before_system);
+  opts->first_system_include = opts->before_system;
+
+  /* Unless -fnostdinc,
+     tack on the standard include file dirs to the specified list */
+  if (!opts->no_standard_includes) {
+    struct default_include *p = include_defaults;
+    char *specd_prefix = opts->include_prefix;
+    char *default_prefix = savestring (GCC_INCLUDE_DIR);
+    int default_len = 0;
+    /* Remove the `include' from /usr/local/lib/gcc.../include.  */
+    if (!strcmp (default_prefix + strlen (default_prefix) - 8, "/include")) {
+      default_len = strlen (default_prefix) - 7;
+      default_prefix[default_len] = 0;
+    }
+    /* Search "translated" versions of GNU directories.
+       These have /usr/local/lib/gcc... replaced by specd_prefix.  */
+    if (specd_prefix != 0 && default_len != 0)
+      for (p = include_defaults; p->fname; p++) {
+	/* Some standard dirs are only for C++.  */
+	if (!p->cplusplus
+	    || (opts->cplusplus && !opts->no_standard_cplusplus_includes)) {
+	  /* Does this dir start with the prefix?  */
+	  if (!strncmp (p->fname, default_prefix, default_len)) {
+	    /* Yes; change prefix and add to search list.  */
+	    struct file_name_list *new
+	      = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
+	    int this_len = strlen (specd_prefix) + strlen (p->fname) - default_len;
+	    char *str = (char *) xmalloc (this_len + 1);
+	    strcpy (str, specd_prefix);
+	    strcat (str, p->fname + default_len);
+	    new->fname = str;
+	    new->control_macro = 0;
+	    new->c_system_include_path = !p->cxx_aware;
+	    new->got_name_map = 0;
+	    append_include_chain (pfile, new, new);
+	    if (opts->first_system_include == 0)
+	      opts->first_system_include = new;
+	  }
+	}
+      }
+    /* Search ordinary names for GNU include directories.  */
+    for (p = include_defaults; p->fname; p++) {
+      /* Some standard dirs are only for C++.  */
+      if (!p->cplusplus
+	  || (opts->cplusplus && !opts->no_standard_cplusplus_includes)) {
+	struct file_name_list *new
+	  = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
+	new->control_macro = 0;
+	new->c_system_include_path = !p->cxx_aware;
+	new->fname = p->fname;
+	new->got_name_map = 0;
+	append_include_chain (pfile, new, new);
+	if (opts->first_system_include == 0)
+	  opts->first_system_include = new;
+      }
+    }
+  }
+
+  /* Tack the after_include chain at the end of the include chain.  */
+  append_include_chain (pfile, opts->after_include, opts->last_after_include);
+  if (opts->first_system_include == 0)
+    opts->first_system_include = opts->after_include;
+
+  /* With -v, print the list of dirs to search.  */
+  if (opts->verbose) {
+    struct file_name_list *p;
+    fprintf (stderr, "#include \"...\" search starts here:\n");
+    for (p = opts->include; p; p = p->next) {
+      if (p == opts->first_bracket_include)
+	fprintf (stderr, "#include <...> search starts here:\n");
+      fprintf (stderr, " %s\n", p->fname);
+    }
+    fprintf (stderr, "End of search list.\n");
+  }
+
+  /* Scan the -imacros files before the main input.
+     Much like #including them, but with no_output set
+     so that only their macro definitions matter.  */
+
+  opts->no_output++; pfile->no_record_file++;
+  for (pend = opts->pending;  pend;  pend = pend->next)
+    {
+      if (pend->cmd != NULL && strcmp (pend->cmd, "-imacros") == 0)
+	{
+	  int fd = open (pend->arg, O_RDONLY, 0666);
+	  if (fd < 0)
+	    {
+	      cpp_perror_with_name (pfile, pend->arg);
+	      return FATAL_EXIT_CODE;
+	    }
+	  cpp_push_buffer (pfile, NULL, 0);
+	  finclude (pfile, fd, pend->arg, 0, NULL_PTR);
+	  cpp_scan_buffer (pfile);
+	}
+    }
+  opts->no_output--; pfile->no_record_file--;
+
+  /* Copy the entire contents of the main input file into
+     the stacked input buffer previously allocated for it.  */
+  if (fname == NULL || *fname == 0) {
+    fname = "";
+    f = 0;
+  } else if ((f = open (fname, O_RDONLY, 0666)) < 0)
+    cpp_pfatal_with_name (pfile, fname);
+
+  /* -MG doesn't select the form of output and must be specified with one of
+     -M or -MM.  -MG doesn't make sense with -MD or -MMD since they don't
+     inhibit compilation.  */
+  if (opts->print_deps_missing_files
+      && (opts->print_deps == 0 || !opts->no_output))
+    fatal (pfile, "-MG must be specified with one of -M or -MM");
+
+  /* Either of two environment variables can specify output of deps.
+     Its value is either "OUTPUT_FILE" or "OUTPUT_FILE DEPS_TARGET",
+     where OUTPUT_FILE is the file to write deps info to
+     and DEPS_TARGET is the target to mention in the deps.  */
+
+  if (opts->print_deps == 0
+      && (getenv ("SUNPRO_DEPENDENCIES") != 0
+	  || getenv ("DEPENDENCIES_OUTPUT") != 0)) {
+    char *spec = getenv ("DEPENDENCIES_OUTPUT");
+    char *s;
+    char *output_file;
+
+    if (spec == 0)
+      {
+	spec = getenv ("SUNPRO_DEPENDENCIES");
+	opts->print_deps = 2;
+      }
+    else
+      opts->print_deps = 1;
+
+    s = spec;
+    /* Find the space before the DEPS_TARGET, if there is one.  */
+    /* This should use index.  (mrs) */
+    while (*s != 0 && *s != ' ') s++;
+    if (*s != 0)
+      {
+	opts->deps_target = s + 1;
+	output_file = (char *) xmalloc (s - spec + 1);
+	bcopy (spec, output_file, s - spec);
+	output_file[s - spec] = 0;
+      }
+    else
+      {
+	opts->deps_target = 0;
+	output_file = spec;
+      }
+
+    opts->deps_file = output_file;
+    opts->print_deps_append = 1;
+  }
+
+  /* For -M, print the expected object file name
+     as the target of this Make-rule.  */
+  if (opts->print_deps)
+    {
+      pfile->deps_allocated_size = 200;
+      pfile->deps_buffer = (char *) xmalloc (pfile->deps_allocated_size);
+      pfile->deps_buffer[0] = 0;
+      pfile->deps_size = 0;
+      pfile->deps_column = 0;
+
+      if (opts->deps_target)
+	deps_output (pfile, opts->deps_target, ':');
+      else if (*opts->in_fname == 0)
+	deps_output (pfile, "-", ':');
+      else
+	{
+	  char *p, *q;
+	  int len;
+
+	  /* Discard all directory prefixes from filename.  */
+	  if ((q = rindex (opts->in_fname, '/')) != NULL
+#ifdef DIR_SEPARATOR
+	      && (q = rindex (opts->in_fname, DIR_SEPARATOR)) != NULL
+#endif
+	      )
+	    ++q;
+	  else
+	    q = opts->in_fname;
+
+	  /* Copy remainder to mungable area.  */
+	  p = (char *) alloca (strlen(q) + 8);
+	  strcpy (p, q);
+
+	  /* Output P, but remove known suffixes.  */
+	  len = strlen (p);
+	  q = p + len;
+	  if (len >= 2
+	      && p[len - 2] == '.'
+	      && index("cCsSm", p[len - 1]))
+	    q = p + (len - 2);
+	  else if (len >= 3
+		   && p[len - 3] == '.'
+		   && p[len - 2] == 'c'
+		   && p[len - 1] == 'c')
+	    q = p + (len - 3);
+	  else if (len >= 4
+		   && p[len - 4] == '.'
+		   && p[len - 3] == 'c'
+		   && p[len - 2] == 'x'
+		   && p[len - 1] == 'x')
+	    q = p + (len - 4);
+	  else if (len >= 4
+		   && p[len - 4] == '.'
+		   && p[len - 3] == 'c'
+		   && p[len - 2] == 'p'
+		   && p[len - 1] == 'p')
+	    q = p + (len - 4);
+
+	  /* Supply our own suffix.  */
+#ifndef VMS
+	  strcpy (q, ".o");
+#else
+	  strcpy (q, ".obj");
+#endif
+
+	  deps_output (pfile, p, ':');
+	  deps_output (pfile, opts->in_fname, ' ');
+	}
+    }
+
+#if 0
+  /* Make sure data ends with a newline.  And put a null after it.  */
+
+  if ((fp->length > 0 && fp->buf[fp->length - 1] != '\n')
+      /* Backslash-newline at end is not good enough.  */
+      || (fp->length > 1 && fp->buf[fp->length - 2] == '\\')) {
+    fp->buf[fp->length++] = '\n';
+    missing_newline = 1;
+  }
+  fp->buf[fp->length] = '\0';
+
+  /* Unless inhibited, convert trigraphs in the input.  */
+
+  if (!no_trigraphs)
+    trigraph_pcp (fp);
+#endif
+
+  /* Scan the -include files before the main input.
+   We push these in reverse order, so that the first one is handled first.  */
+
+  pfile->no_record_file++;
+  opts->pending = nreverse_pending (opts->pending);
+  for (pend = opts->pending;  pend;  pend = pend->next)
+    {
+      if (pend->cmd != NULL && strcmp (pend->cmd, "-include") == 0)
+	{
+	  int fd = open (pend->arg, O_RDONLY, 0666);
+	  if (fd < 0)
+	    {
+	      cpp_perror_with_name (pfile, pend->arg);
+	      return FATAL_EXIT_CODE;
+	    }
+	  cpp_push_buffer (pfile, NULL, 0);
+	  finclude (pfile, fd, pend->arg, 0, NULL_PTR);
+	}
+    }
+  pfile->no_record_file--;
+
+  /* Free the pending list. */
+  for (pend = opts->pending;  pend; )
+    {
+      struct cpp_pending *next = pend->next;
+      free (pend);
+      pend = next;
+    }
+  opts->pending = NULL;
+
+#if 0
+  /* Scan the input, processing macros and directives.  */
+
+  rescan (&outbuf, 0);
+
+  if (missing_newline)
+    fp->lineno--;
+
+  if (CPP_PEDANTIC (pfile) && missing_newline)
+    pedwarn ("file does not end in newline");
+
+#endif
+  if (finclude (pfile, f, fname, 0, NULL_PTR))
+    output_line_command (pfile, 0, same_file);
+  return SUCCESS_EXIT_CODE;
+}
+
+void
+init_parse_file (pfile)
+     cpp_reader *pfile;
+{
+  bzero ((char *) pfile, sizeof (cpp_reader));
+  pfile->get_token = cpp_get_token;
+
+  pfile->token_buffer_size = 200;
+  pfile->token_buffer = (U_CHAR*)xmalloc (pfile->token_buffer_size);
+  CPP_SET_WRITTEN (pfile, 0);
+
+  pfile->system_include_depth = 0;
+  pfile->dont_repeat_files = 0;
+  pfile->all_include_files = 0;
+  pfile->max_include_len = 0;
+  pfile->timebuf = NULL;
+  pfile->only_seen_white = 1;
+  pfile->buffer = CPP_NULL_BUFFER(pfile);
+}
+
+static struct cpp_pending *
+nreverse_pending (list)
+     struct cpp_pending *list;
+     
+{
+  register struct cpp_pending *prev = 0, *next, *pend;
+  for (pend = list;  pend;  pend = next)
+    {
+      next = pend->next;
+      pend->next = prev;
+      prev = pend;
+    }
+  return prev;
+}
+
+static void
+push_pending (pfile, cmd, arg)
+     cpp_reader *pfile;
+     char *cmd;
+     char *arg;
+{
+  struct cpp_pending *pend
+    = (struct cpp_pending*)xmalloc (sizeof (struct cpp_pending));
+  pend->cmd = cmd;
+  pend->arg = arg;
+  pend->next = CPP_OPTIONS (pfile)->pending;
+  CPP_OPTIONS (pfile)->pending = pend;
+}
+
+/* Handle command-line options in (argc, argv).
+   Can be called multiple times, to handle multiple sets of options.
+   Returns if an unrecognized option is seen.
+   Returns number of handled arguments.  */
+
+int
+cpp_handle_options (pfile, argc, argv)
+     cpp_reader *pfile;
+     int argc;
+     char **argv;
+{
+  int i;
+  struct cpp_options *opts = CPP_OPTIONS (pfile);
+  for (i = 0; i < argc; i++) {
+    if (argv[i][0] != '-') {
+      if (opts->out_fname != NULL)
+	fatal ("Usage: %s [switches] input output", argv[0]);
+      else if (opts->in_fname != NULL)
+	opts->out_fname = argv[i];
+      else
+	opts->in_fname = argv[i];
+    } else {
+      switch (argv[i][1]) {
+
+      case 'i':
+	if (!strcmp (argv[i], "-include")
+	    || !strcmp (argv[i], "-imacros")) {
+	  if (i + 1 == argc)
+	    fatal ("Filename missing after `%s' option", argv[i]);
+	  else
+	    push_pending (pfile, argv[i], argv[i+1]), i++;
+	}
+	if (!strcmp (argv[i], "-iprefix")) {
+	  if (i + 1 == argc)
+	    fatal ("Filename missing after `-iprefix' option");
+	  else
+	    opts->include_prefix = argv[++i];
+	}
+	if (!strcmp (argv[i], "-ifoutput")) {
+	  opts->output_conditionals = 1;
+	}
+	if (!strcmp (argv[i], "-isystem")) {
+	  struct file_name_list *dirtmp;
+
+	  if (i + 1 == argc)
+	    fatal ("Filename missing after `-isystem' option");
+
+	  dirtmp = (struct file_name_list *)
+	    xmalloc (sizeof (struct file_name_list));
+	  dirtmp->next = 0;
+	  dirtmp->control_macro = 0;
+	  dirtmp->c_system_include_path = 1;
+	  dirtmp->fname = (char *) xmalloc (strlen (argv[i+1]) + 1);
+	  strcpy (dirtmp->fname, argv[++i]);
+	  dirtmp->got_name_map = 0;
+
+	  if (opts->before_system == 0)
+	    opts->before_system = dirtmp;
+	  else
+	    opts->last_before_system->next = dirtmp;
+	  opts->last_before_system = dirtmp; /* Tail follows the last one */
+	}
+	/* Add directory to end of path for includes,
+	   with the default prefix at the front of its name.  */
+	if (!strcmp (argv[i], "-iwithprefix")) {
+	  struct file_name_list *dirtmp;
+	  char *prefix;
+
+	  if (opts->include_prefix != 0)
+	    prefix = opts->include_prefix;
+	  else {
+	    prefix = savestring (GCC_INCLUDE_DIR);
+	    /* Remove the `include' from /usr/local/lib/gcc.../include.  */
+	    if (!strcmp (prefix + strlen (prefix) - 8, "/include"))
+	      prefix[strlen (prefix) - 7] = 0;
+	  }
+
+	  dirtmp = (struct file_name_list *)
+	    xmalloc (sizeof (struct file_name_list));
+	  dirtmp->next = 0;	/* New one goes on the end */
+	  dirtmp->control_macro = 0;
+	  dirtmp->c_system_include_path = 0;
+	  if (i + 1 == argc)
+	    fatal ("Directory name missing after `-iwithprefix' option");
+
+	  dirtmp->fname = (char *) xmalloc (strlen (argv[i+1])
+					    + strlen (prefix) + 1);
+	  strcpy (dirtmp->fname, prefix);
+	  strcat (dirtmp->fname, argv[++i]);
+	  dirtmp->got_name_map = 0;
+
+	  if (opts->after_include == 0)
+	    opts->after_include = dirtmp;
+	  else
+	    opts->last_after_include->next = dirtmp;
+	  opts->last_after_include = dirtmp; /* Tail follows the last one */
+	}
+	/* Add directory to main path for includes,
+	   with the default prefix at the front of its name.  */
+	if (!strcmp (argv[i], "-iwithprefixbefore")) {
+	  struct file_name_list *dirtmp;
+	  char *prefix;
+
+	  if (opts->include_prefix != 0)
+	    prefix = opts->include_prefix;
+	  else {
+	    prefix = savestring (GCC_INCLUDE_DIR);
+	    /* Remove the `include' from /usr/local/lib/gcc.../include.  */
+	    if (!strcmp (prefix + strlen (prefix) - 8, "/include"))
+	      prefix[strlen (prefix) - 7] = 0;
+	  }
+
+	  dirtmp = (struct file_name_list *)
+	    xmalloc (sizeof (struct file_name_list));
+	  dirtmp->next = 0;	/* New one goes on the end */
+	  dirtmp->control_macro = 0;
+	  dirtmp->c_system_include_path = 0;
+	  if (i + 1 == argc)
+	    fatal ("Directory name missing after `-iwithprefixbefore' option");
+
+	  dirtmp->fname = (char *) xmalloc (strlen (argv[i+1])
+					    + strlen (prefix) + 1);
+	  strcpy (dirtmp->fname, prefix);
+	  strcat (dirtmp->fname, argv[++i]);
+	  dirtmp->got_name_map = 0;
+
+	  append_include_chain (pfile, dirtmp, dirtmp);
+	}
+	/* Add directory to end of path for includes.  */
+	if (!strcmp (argv[i], "-idirafter")) {
+	  struct file_name_list *dirtmp;
+
+	  dirtmp = (struct file_name_list *)
+	    xmalloc (sizeof (struct file_name_list));
+	  dirtmp->next = 0;	/* New one goes on the end */
+	  dirtmp->control_macro = 0;
+	  dirtmp->c_system_include_path = 0;
+	  if (i + 1 == argc)
+	    fatal ("Directory name missing after `-idirafter' option");
+	  else
+	    dirtmp->fname = argv[++i];
+	  dirtmp->got_name_map = 0;
+
+	  if (opts->after_include == 0)
+	    opts->after_include = dirtmp;
+	  else
+	    opts->last_after_include->next = dirtmp;
+	  opts->last_after_include = dirtmp; /* Tail follows the last one */
+	}
+	break;
+
+      case 'o':
+	if (opts->out_fname != NULL)
+	  fatal ("Output filename specified twice");
+	if (i + 1 == argc)
+	  fatal ("Filename missing after -o option");
+	opts->out_fname = argv[++i];
+	if (!strcmp (opts->out_fname, "-"))
+	  opts->out_fname = "";
+	break;
+
+      case 'p':
+	if (!strcmp (argv[i], "-pedantic"))
+	  CPP_PEDANTIC (pfile) = 1;
+	else if (!strcmp (argv[i], "-pedantic-errors")) {
+	  CPP_PEDANTIC (pfile) = 1;
+	  opts->pedantic_errors = 1;
+	}
+#if 0
+	else if (!strcmp (argv[i], "-pcp")) {
+	  char *pcp_fname = argv[++i];
+	  pcp_outfile = 
+	    ((pcp_fname[0] != '-' || pcp_fname[1] != '\0')
+	     ? fopen (pcp_fname, "w")
+	     : fdopen (dup (fileno (stdout)), "w"));
+	  if (pcp_outfile == 0)
+	    cpp_pfatal_with_name (pfile, pcp_fname);
+	  no_precomp = 1;
+	}
+#endif
+	break;
+
+      case 't':
+	if (!strcmp (argv[i], "-traditional")) {
+	  opts->traditional = 1;
+	  if (opts->dollars_in_ident > 0)
+	    opts->dollars_in_ident = 1;
+	} else if (!strcmp (argv[i], "-trigraphs")) {
+	  if (!opts->chill)
+	    opts->no_trigraphs = 0;
+	}
+	break;
+
+      case 'l':
+	if (! strcmp (argv[i], "-lang-c"))
+	  opts->cplusplus = 0, opts->cplusplus_comments = 0, opts->objc = 0;
+	if (! strcmp (argv[i], "-lang-c++"))
+	  opts->cplusplus = 1, opts->cplusplus_comments = 1, opts->objc = 0;
+	if (! strcmp (argv[i], "-lang-c-c++-comments"))
+	  opts->cplusplus = 0, opts->cplusplus_comments = 1, opts->objc = 0;
+	if (! strcmp (argv[i], "-lang-objc"))
+	  opts->objc = 1, opts->cplusplus = 0, opts->cplusplus_comments = 1;
+	if (! strcmp (argv[i], "-lang-objc++"))
+	  opts->objc = 1, opts->cplusplus = 1, opts->cplusplus_comments = 1;
+ 	if (! strcmp (argv[i], "-lang-asm"))
+ 	  opts->lang_asm = 1;
+ 	if (! strcmp (argv[i], "-lint"))
+ 	  opts->for_lint = 1;
+	if (! strcmp (argv[i], "-lang-chill"))
+	  opts->objc = 0, opts->cplusplus = 0, opts->chill = 1,
+	  opts->traditional = 1, opts->no_trigraphs = 1;
+	break;
+
+      case '+':
+	opts->cplusplus = 1, opts->cplusplus_comments = 1;
+	break;
+
+      case 'w':
+	opts->inhibit_warnings = 1;
+	break;
+
+      case 'W':
+	if (!strcmp (argv[i], "-Wtrigraphs"))
+	  opts->warn_trigraphs = 1;
+	else if (!strcmp (argv[i], "-Wno-trigraphs"))
+	  opts->warn_trigraphs = 0;
+	else if (!strcmp (argv[i], "-Wcomment"))
+	  opts->warn_comments = 1;
+	else if (!strcmp (argv[i], "-Wno-comment"))
+	  opts->warn_comments = 0;
+	else if (!strcmp (argv[i], "-Wcomments"))
+	  opts->warn_comments = 1;
+	else if (!strcmp (argv[i], "-Wno-comments"))
+	  opts->warn_comments = 0;
+	else if (!strcmp (argv[i], "-Wtraditional"))
+	  opts->warn_stringify = 1;
+	else if (!strcmp (argv[i], "-Wno-traditional"))
+	  opts->warn_stringify = 0;
+	else if (!strcmp (argv[i], "-Wimport"))
+	  opts->warn_import = 1;
+	else if (!strcmp (argv[i], "-Wno-import"))
+	  opts->warn_import = 0;
+	else if (!strcmp (argv[i], "-Werror"))
+	  opts->warnings_are_errors = 1;
+	else if (!strcmp (argv[i], "-Wno-error"))
+	  opts->warnings_are_errors = 0;
+	else if (!strcmp (argv[i], "-Wall"))
+	  {
+	    opts->warn_trigraphs = 1;
+	    opts->warn_comments = 1;
+	  }
+	break;
+
+      case 'M':
+	/* The style of the choices here is a bit mixed.
+	   The chosen scheme is a hybrid of keeping all options in one string
+	   and specifying each option in a separate argument:
+	   -M|-MM|-MD file|-MMD file [-MG].  An alternative is:
+	   -M|-MM|-MD file|-MMD file|-MG|-MMG; or more concisely:
+	   -M[M][G][D file].  This is awkward to handle in specs, and is not
+	   as extensible.  */
+	/* ??? -MG must be specified in addition to one of -M or -MM.
+	   This can be relaxed in the future without breaking anything.
+	   The converse isn't true.  */
+
+	/* -MG isn't valid with -MD or -MMD.  This is checked for later.  */
+	if (!strcmp (argv[i], "-MG"))
+	  {
+	    opts->print_deps_missing_files = 1;
+	    break;
+	  }
+	if (!strcmp (argv[i], "-M"))
+	  opts->print_deps = 2;
+	else if (!strcmp (argv[i], "-MM"))
+	  opts->print_deps = 1;
+	else if (!strcmp (argv[i], "-MD"))
+	  opts->print_deps = 2;
+	else if (!strcmp (argv[i], "-MMD"))
+	  opts->print_deps = 1;
+	/* For -MD and -MMD options, write deps on file named by next arg.  */
+	if (!strcmp (argv[i], "-MD") || !strcmp (argv[i], "-MMD"))
+	  {
+	    if (i+1 == argc)
+	      fatal ("Filename missing after %s option", argv[i]);
+	    opts->deps_file = argv[++i];
+	  }
+	else
+	  {
+	    /* For -M and -MM, write deps on standard output
+	       and suppress the usual output.  */
+	    opts->no_output = 1;
+	  }	  
+	break;
+
+      case 'd':
+	{
+	  char *p = argv[i] + 2;
+	  char c;
+	  while ((c = *p++) != 0) {
+	    /* Arg to -d specifies what parts of macros to dump */
+	    switch (c) {
+	    case 'M':
+	      opts->dump_macros = dump_only;
+	      opts->no_output = 1;
+	      break;
+	    case 'N':
+	      opts->dump_macros = dump_names;
+	      break;
+	    case 'D':
+	      opts->dump_macros = dump_definitions;
+	      break;
+	    }
+	  }
+	}
+	break;
+
+      case 'g':
+	if (argv[i][2] == '3')
+	  opts->debug_output = 1;
+	break;
+
+      case 'v':
+	fprintf (stderr, "GNU CPP version %s", version_string);
+#ifdef TARGET_VERSION
+	TARGET_VERSION;
+#endif
+	fprintf (stderr, "\n");
+	opts->verbose = 1;
+	break;
+
+      case 'H':
+	opts->print_include_names = 1;
+	break;
+
+      case 'D':
+	if (argv[i][2] != 0)
+	  push_pending (pfile, "-D", argv[i] + 2);
+	else if (i + 1 == argc)
+	  fatal ("Macro name missing after -D option");
+	else
+	  i++, push_pending (pfile, "-D", argv[i]);
+	break;
+
+      case 'A':
+	{
+	  char *p;
+
+	  if (argv[i][2] != 0)
+	    p = argv[i] + 2;
+	  else if (i + 1 == argc)
+	    fatal ("Assertion missing after -A option");
+	  else
+	    p = argv[++i];
+
+	  if (!strcmp (p, "-")) {
+	    struct cpp_pending **ptr;
+	    /* -A- eliminates all predefined macros and assertions.
+	       Let's include also any that were specified earlier
+	       on the command line.  That way we can get rid of any
+	       that were passed automatically in from GCC.  */
+	    int j;
+	    opts->inhibit_predefs = 1;
+	    for (ptr = &opts->pending; *ptr != NULL; )
+	      {
+		struct cpp_pending *pend = *ptr;
+		if (pend->cmd && pend->cmd[0] == '-'
+		    && (pend->cmd[1] == 'D' || pend->cmd[1] == 'A'))
+		  {
+		    *ptr = pend->next;
+		    free (pend);
+		  }
+		else
+		  ptr = &pend->next;
+	      }
+	  } else {
+	    push_pending (pfile, "-A", p);
+	  }
+	}
+	break;
+
+      case 'U':		/* JF #undef something */
+	if (argv[i][2] != 0)
+	  push_pending (pfile, "-U", argv[i] + 2);
+	else if (i + 1 == argc)
+	  fatal ("Macro name missing after -U option");
+	else
+	  push_pending (pfile, "-U", argv[i+1]), i++;
+	break;
+
+      case 'C':
+	opts->put_out_comments = 1;
+	break;
+
+      case 'E':			/* -E comes from cc -E; ignore it.  */
+	break;
+
+      case 'P':
+	opts->no_line_commands = 1;
+	break;
+
+      case '$':			/* Don't include $ in identifiers.  */
+	opts->dollars_in_ident = 0;
+	break;
+
+      case 'I':			/* Add directory to path for includes.  */
+	{
+	  struct file_name_list *dirtmp;
+
+	  if (! CPP_OPTIONS(pfile)->ignore_srcdir
+	      && !strcmp (argv[i] + 2, "-")) {
+	    CPP_OPTIONS (pfile)->ignore_srcdir = 1;
+	    /* Don't use any preceding -I directories for #include <...>.  */
+	    CPP_OPTIONS (pfile)->first_bracket_include = 0;
+	  }
+	  else {
+	    dirtmp = (struct file_name_list *)
+	      xmalloc (sizeof (struct file_name_list));
+	    dirtmp->next = 0;		/* New one goes on the end */
+	    dirtmp->control_macro = 0;
+	    dirtmp->c_system_include_path = 0;
+	    if (argv[i][2] != 0)
+	      dirtmp->fname = argv[i] + 2;
+	    else if (i + 1 == argc)
+	      fatal ("Directory name missing after -I option");
+	    else
+	      dirtmp->fname = argv[++i];
+	    dirtmp->got_name_map = 0;
+	    append_include_chain (pfile, dirtmp, dirtmp);
+	  }
+	}
+	break;
+
+      case 'n':
+	if (!strcmp (argv[i], "-nostdinc"))
+	  /* -nostdinc causes no default include directories.
+	     You must specify all include-file directories with -I.  */
+	  opts->no_standard_includes = 1;
+	else if (!strcmp (argv[i], "-nostdinc++"))
+	  /* -nostdinc++ causes no default C++-specific include directories. */
+	  opts->no_standard_cplusplus_includes = 1;
+#if 0
+	else if (!strcmp (argv[i], "-noprecomp"))
+	  no_precomp = 1;
+#endif
+	break;
+
+      case 'u':
+	/* Sun compiler passes undocumented switch "-undef".
+	   Let's assume it means to inhibit the predefined symbols.  */
+	opts->inhibit_predefs = 1;
+	break;
+
+      case '\0': /* JF handle '-' as file name meaning stdin or stdout */
+	if (opts->in_fname == NULL) {
+	  opts->in_fname = "";
+	  break;
+	} else if (opts->out_fname == NULL) {
+	  opts->out_fname = "";
+	  break;
+	}	/* else fall through into error */
+
+      default:
+	return i;
+      }
+    }
+  }
+  return i;
+}
+
+void
+cpp_finish (pfile)
+     cpp_reader *pfile;
+{
+  struct cpp_options *opts = CPP_OPTIONS (pfile);
+  
+  if (opts->print_deps)
+    {
+      /* Stream on which to print the dependency information.  */
+      FILE *deps_stream;
+
+      /* Don't actually write the deps file if compilation has failed.  */
+      if (pfile->errors == 0)
+	{
+	  char *deps_mode = opts->print_deps_append ? "a" : "w";
+	  if (opts->deps_file == 0)
+	    deps_stream = stdout;
+	  else if ((deps_stream = fopen (opts->deps_file, deps_mode)) == 0)
+	    cpp_pfatal_with_name (pfile, opts->deps_file);
+	  fputs (pfile->deps_buffer, deps_stream);
+	  putc ('\n', deps_stream);
+	  if (opts->deps_file)
+	    {
+	      if (ferror (deps_stream) || fclose (deps_stream) != 0)
+		fatal ("I/O error on output");
+	    }
+	}
+    }
+}
+
+/* Free resources used by PFILE. */
+
+void
+cpp_cleanup (pfile)
+     cpp_reader *pfile;
+{
+  int i;
+  while ( CPP_BUFFER (pfile) != CPP_NULL_BUFFER (pfile))
+    cpp_pop_buffer (pfile);
+
+  if (pfile->token_buffer)
+    {
+      free (pfile->token_buffer);
+      pfile->token_buffer = NULL;
+    }
+
+  if (pfile->deps_buffer)
+    {
+      free (pfile->deps_buffer);
+      pfile->deps_buffer = NULL;
+      pfile->deps_allocated_size = 0;
+    }
+
+  while (pfile->if_stack)
+    {
+      IF_STACK_FRAME *temp = pfile->if_stack;
+      pfile->if_stack = temp->next;
+      free (temp);
+    }
+
+  while (pfile->dont_repeat_files)
+    {
+      struct file_name_list *temp = pfile->dont_repeat_files;
+      pfile->dont_repeat_files = temp->next;
+      free (temp->fname);
+      free (temp);
+    }
+
+  while (pfile->all_include_files)
+    {
+      struct file_name_list *temp = pfile->all_include_files;
+      pfile->all_include_files = temp->next;
+      free (temp->fname);
+      free (temp);
+    }
+
+  for (i = IMPORT_HASH_SIZE; --i >= 0; )
+    {
+      register struct import_file *imp = pfile->import_hash_table[i];
+      while (imp)
+	{
+	  struct import_file *next = imp->next;
+	  free (imp->name);
+	  free (imp);
+	  imp = next;
+	}
+      pfile->import_hash_table[i] = 0;
+    }
+
+  for (i = ASSERTION_HASHSIZE; --i >= 0; )
+    {
+      while (pfile->assertion_hashtab[i])
+	delete_assertion (pfile->assertion_hashtab[i]);
+    }
+
+  cpp_hash_cleanup (pfile);
+}
+
+static int
+do_assert (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  long symstart;		/* remember where symbol name starts */
+  int c;
+  int sym_length;		/* and how long it is */
+  struct arglist *tokens = NULL;
+
+  if (CPP_PEDANTIC (pfile) && CPP_OPTIONS (pfile)->done_initializing
+      && !CPP_BUFFER (pfile)->system_header_p)
+    cpp_pedwarn (pfile, "ANSI C does not allow `#assert'");
+
+  cpp_skip_hspace (pfile);
+  symstart = CPP_WRITTEN (pfile);	/* remember where it starts */
+  parse_name (pfile, GETC());
+  sym_length = check_macro_name (pfile, pfile->token_buffer + symstart,
+				 "assertion");
+
+  cpp_skip_hspace (pfile);
+  if (PEEKC() != '(') {
+    cpp_error (pfile, "missing token-sequence in `#assert'");
+    goto error;
+  }
+
+  {
+    int error_flag = 0;
+    tokens = read_token_list (pfile, &error_flag);
+    if (error_flag)
+      goto error;
+    if (tokens == 0) {
+      cpp_error (pfile, "empty token-sequence in `#assert'");
+      goto error;
+    }
+  cpp_skip_hspace (pfile);
+  c = PEEKC ();
+  if (c != EOF && c != '\n')
+      cpp_pedwarn (pfile, "junk at end of `#assert'");
+  skip_rest_of_line (pfile);
+  }
+
+  /* If this name isn't already an assertion name, make it one.
+     Error if it was already in use in some other way.  */
+
+  {
+    ASSERTION_HASHNODE *hp;
+    U_CHAR *symname = pfile->token_buffer + symstart;
+    int hashcode = hashf (symname, sym_length, ASSERTION_HASHSIZE);
+    struct tokenlist_list *value
+      = (struct tokenlist_list *) xmalloc (sizeof (struct tokenlist_list));
+
+    hp = assertion_lookup (pfile, symname, sym_length, hashcode);
+    if (hp == NULL) {
+      if (sym_length == 7 && ! strncmp (symname, "defined", sym_length))
+	cpp_error (pfile, "`defined' redefined as assertion");
+      hp = assertion_install (pfile, symname, sym_length, hashcode);
+    }
+
+    /* Add the spec'd token-sequence to the list of such.  */
+    value->tokens = tokens;
+    value->next = hp->value;
+    hp->value = value;
+  }
+  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
+  return 0;
+ error:
+  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
+  skip_rest_of_line (pfile);
+  return 1;
+}
+
+static int
+do_unassert (pfile, keyword, buf, limit)
+     cpp_reader *pfile;
+     struct directive *keyword;
+     U_CHAR *buf, *limit;
+{
+  long symstart;		/* remember where symbol name starts */
+  int sym_length;	/* and how long it is */
+  int c;
+
+  struct arglist *tokens = NULL;
+  int tokens_specified = 0;
+
+  if (CPP_PEDANTIC (pfile) && CPP_OPTIONS (pfile)->done_initializing
+      && !CPP_BUFFER (pfile)->system_header_p)
+    cpp_pedwarn (pfile, "ANSI C does not allow `#unassert'");
+
+  cpp_skip_hspace (pfile);
+
+  symstart = CPP_WRITTEN (pfile);	/* remember where it starts */
+  parse_name (pfile, GETC());
+  sym_length = check_macro_name (pfile, pfile->token_buffer + symstart,
+				 "assertion");
+
+  cpp_skip_hspace (pfile);
+  if (PEEKC() == '(') {
+    int error_flag = 0;
+
+    tokens = read_token_list (pfile, &error_flag);
+    if (error_flag)
+      goto error;
+    if (tokens == 0) {
+      cpp_error (pfile, "empty token list in `#unassert'");
+      goto error;
+    }
+
+    tokens_specified = 1;
+  }
+
+  cpp_skip_hspace (pfile);
+  c = PEEKC ();
+  if (c != EOF && c != '\n')
+      cpp_error (pfile, "junk at end of `#unassert'");
+  skip_rest_of_line (pfile);
+
+  {
+    ASSERTION_HASHNODE *hp;
+    U_CHAR *symname = pfile->token_buffer + symstart;
+    int hashcode = hashf (symname, sym_length, ASSERTION_HASHSIZE);
+    struct tokenlist_list *tail, *prev;
+
+    hp = assertion_lookup (pfile, symname, sym_length, hashcode);
+    if (hp == NULL)
+      return 1;
+
+    /* If no token list was specified, then eliminate this assertion
+       entirely.  */
+    if (! tokens_specified)
+      delete_assertion (hp);
+    else {
+      /* If a list of tokens was given, then delete any matching list.  */
+
+      tail = hp->value;
+      prev = 0;
+      while (tail) {
+	struct tokenlist_list *next = tail->next;
+	if (compare_token_lists (tail->tokens, tokens)) {
+	  if (prev)
+	    prev->next = next;
+	  else
+	    hp->value = tail->next;
+	  free_token_list (tail->tokens);
+	  free (tail);
+	} else {
+	  prev = tail;
+	}
+	tail = next;
+      }
+    }
+  }
+
+  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
+  return 0;
+ error:
+  CPP_SET_WRITTEN (pfile, symstart); /* Pop */
+  skip_rest_of_line (pfile);
+  return 1;
+}
+
+/* Test whether there is an assertion named NAME
+   and optionally whether it has an asserted token list TOKENS.
+   NAME is not null terminated; its length is SYM_LENGTH.
+   If TOKENS_SPECIFIED is 0, then don't check for any token list.  */
+
+int
+check_assertion (pfile, name, sym_length, tokens_specified, tokens)
+     cpp_reader *pfile;
+     U_CHAR *name;
+     int sym_length;
+     int tokens_specified;
+     struct arglist *tokens;
+{
+  ASSERTION_HASHNODE *hp;
+  int hashcode = hashf (name, sym_length, ASSERTION_HASHSIZE);
+
+  if (CPP_PEDANTIC (pfile) && !CPP_BUFFER (pfile)->system_header_p)
+    cpp_pedwarn (pfile, "ANSI C does not allow testing assertions");
+
+  hp = assertion_lookup (pfile, name, sym_length, hashcode);
+  if (hp == NULL)
+    /* It is not an assertion; just return false.  */
+    return 0;
+
+  /* If no token list was specified, then value is 1.  */
+  if (! tokens_specified)
+    return 1;
+
+  {
+    struct tokenlist_list *tail;
+
+    tail = hp->value;
+
+    /* If a list of tokens was given,
+       then succeed if the assertion records a matching list.  */
+
+    while (tail) {
+      if (compare_token_lists (tail->tokens, tokens))
+	return 1;
+      tail = tail->next;
+    }
+
+    /* Fail if the assertion has no matching list.  */
+    return 0;
+  }
+}
+
+/* Compare two lists of tokens for equality including order of tokens.  */
+
+static int
+compare_token_lists (l1, l2)
+     struct arglist *l1, *l2;
+{
+  while (l1 && l2) {
+    if (l1->length != l2->length)
+      return 0;
+    if (strncmp (l1->name, l2->name, l1->length))
+      return 0;
+    l1 = l1->next;
+    l2 = l2->next;
+  }
+
+  /* Succeed if both lists end at the same time.  */
+  return l1 == l2;
+}
+
+struct arglist *
+reverse_token_list (tokens)
+     struct arglist *tokens;
+{
+  register struct arglist *prev = 0, *this, *next;
+  for (this = tokens; this; this = next)
+    {
+      next = this->next;
+      this->next = prev;
+      prev = this;
+    }
+  return prev;
+}
+
+/* Read a space-separated list of tokens ending in a close parenthesis.
+   Return a list of strings, in the order they were written.
+   (In case of error, return 0 and store -1 in *ERROR_FLAG.) */
+
+static struct arglist *
+read_token_list (pfile, error_flag)
+     cpp_reader *pfile;
+     int *error_flag;
+{
+  struct arglist *token_ptrs = 0;
+  int depth = 1;
+  int length;
+
+  *error_flag = 0;
+  FORWARD (1);  /* Skip '(' */
+
+  /* Loop over the assertion value tokens.  */
+  while (depth > 0)
+    {
+      struct arglist *temp;
+      long name_written = CPP_WRITTEN (pfile);
+      int eofp = 0;  int c;
+
+      cpp_skip_hspace (pfile);
+
+      c = GETC ();
+	  
+      /* Find the end of the token.  */
+      if (c == '(')
+        {
+	  CPP_PUTC (pfile, c);
+	  depth++;
+        }
+      else if (c == ')')
+        {
+	  depth--;
+	  if (depth == 0)
+	    break;
+	  CPP_PUTC (pfile, c);
+        }
+      else if (c == '"' || c == '\'')
+        {
+	  FORWARD(-1);
+	  cpp_get_token (pfile);
+        }
+      else if (c == '\n')
+	break;
+      else
+        {
+	  while (c != EOF && ! is_space[c] && c != '(' && c != ')'
+		 && c != '"' && c != '\'')
+	    {
+	      CPP_PUTC (pfile, c);
+	      c = GETC();
+	    }
+	  if (c != EOF)  FORWARD(-1);
+        }
+
+      length = CPP_WRITTEN (pfile) - name_written;
+      temp = (struct arglist *)
+	  xmalloc (sizeof (struct arglist) + length + 1);
+      temp->name = (U_CHAR *) (temp + 1);
+      bcopy ((char *) (pfile->token_buffer + name_written),
+	     (char *) temp->name, length);
+      temp->name[length] = 0;
+      temp->next = token_ptrs;
+      token_ptrs = temp;
+      temp->length = length;
+
+      CPP_ADJUST_WRITTEN (pfile, -length); /* pop */
+
+      if (c == EOF || c == '\n')
+        { /* FIXME */
+	  cpp_error (pfile,
+		     "unterminated token sequence following  `#' operator");
+	  return 0;
+	}
+    }
+
+  /* We accumulated the names in reverse order.
+     Now reverse them to get the proper order.  */
+  return reverse_token_list (token_ptrs);
+}
+
+static void
+free_token_list (tokens)
+     struct arglist *tokens;
+{
+  while (tokens) {
+    struct arglist *next = tokens->next;
+    free (tokens->name);
+    free (tokens);
+    tokens = next;
+  }
+}
+
+/* Get the file-mode and data size of the file open on FD
+   and store them in *MODE_POINTER and *SIZE_POINTER.  */
+
+static int
+file_size_and_mode (fd, mode_pointer, size_pointer)
+     int fd;
+     int *mode_pointer;
+     long int *size_pointer;
+{
+  struct stat sbuf;
+
+  if (fstat (fd, &sbuf) < 0) return (-1);
+  if (mode_pointer) *mode_pointer = sbuf.st_mode;
+  if (size_pointer) *size_pointer = sbuf.st_size;
+  return 0;
+}
+
+/* Read LEN bytes at PTR from descriptor DESC, for file FILENAME,
+   retrying if necessary.  Return a negative value if an error occurs,
+   otherwise return the actual number of bytes read,
+   which must be LEN unless end-of-file was reached.  */
+
+static int
+safe_read (desc, ptr, len)
+     int desc;
+     char *ptr;
+     int len;
+{
+  int left = len;
+  while (left > 0) {
+    int nchars = read (desc, ptr, left);
+    if (nchars < 0)
+      {
+#ifdef EINTR
+	if (errno == EINTR)
+	  continue;
+#endif
+	return nchars;
+      }
+    if (nchars == 0)
+      break;
+    ptr += nchars;
+    left -= nchars;
+  }
+  return len - left;
+}
+
+static char *
+savestring (input)
+     char *input;
+{
+  unsigned size = strlen (input);
+  char *output = xmalloc (size + 1);
+  strcpy (output, input);
+  return output;
+}
+
+/* Initialize PMARK to remember the current position of PFILE. */
+void
+parse_set_mark (pmark, pfile)
+     struct parse_marker *pmark;
+     cpp_reader *pfile;
+{
+  cpp_buffer *pbuf = CPP_BUFFER (pfile);
+  pmark->next = pbuf->marks;
+  pbuf->marks = pmark;
+  pmark->buf = pbuf;
+  pmark->position = pbuf->cur - pbuf->buf;
+}
+
+/* Cleanup PMARK - we no longer need it. */
+void
+parse_clear_mark (pmark)
+     struct parse_marker *pmark;
+{
+  struct parse_marker **pp = &pmark->buf->marks;
+  for (; ; pp = &(*pp)->next) {
+    if (*pp == NULL) fatal ("internal error", "in parse_set_mark");
+    if (*pp == pmark) break;
+  }
+  *pp = pmark->next;
+}
+
+/* Backup the current position of PFILE to that saved in PMARK. */
+
+void
+parse_goto_mark (pmark, pfile)
+     struct parse_marker *pmark;
+     cpp_reader *pfile;
+{
+  cpp_buffer *pbuf = CPP_BUFFER (pfile);
+  if (pbuf != pmark->buf)
+    fatal ("internal error %s", "parse_goto_mark");
+  pbuf->cur = pbuf->buf + pmark->position;
+}
+
+/* Reset PMARK to point to the current position of PFILE.  (Same
+   as parse_clear_mark (PMARK), parse_set_mark (PMARK, PFILE) but faster. */
+
+void
+parse_move_mark (pmark, pfile)
+     struct parse_marker *pmark;
+     cpp_reader *pfile;
+{
+  cpp_buffer *pbuf = CPP_BUFFER (pfile);
+  if (pbuf != pmark->buf)
+    fatal ("internal error %s", "parse_move_mark");
+  pmark->position = pbuf->cur - pbuf->buf;
+}
+
+int
+cpp_read_check_assertion (pfile)
+     cpp_reader *pfile;
+{
+  int name_start = CPP_WRITTEN (pfile);
+  int name_length, name_written;
+  int result;
+  FORWARD (1);  /* Skip '#' */
+  cpp_skip_hspace (pfile);
+  parse_name (pfile, GETC ());
+  name_written = CPP_WRITTEN (pfile);
+  name_length = name_written - name_start;
+  cpp_skip_hspace (pfile);
+  if (CPP_BUF_PEEK (CPP_BUFFER (pfile)) == '(')
+    {
+      int error_flag;
+      struct arglist *token_ptrs = read_token_list (pfile, &error_flag);
+      result = check_assertion (pfile,
+				pfile->token_buffer + name_start, name_length,
+				1, token_ptrs);
+    }
+  else
+    result = check_assertion (pfile,
+			      pfile->token_buffer + name_start, name_length,
+			      0, NULL_PTR);
+  CPP_ADJUST_WRITTEN (pfile, - name_length);  /* pop */
+  return result;
+}
+
+void
+cpp_print_file_and_line (pfile)
+     cpp_reader *pfile;
+{
+  cpp_buffer *ip = cpp_file_buffer (pfile);
+
+  if (ip != NULL)
+    {
+      long line, col;
+      cpp_buf_line_and_col (ip, &line, &col);
+      cpp_file_line_for_message (pfile, ip->nominal_fname,
+				 line, pfile->show_column ? col : -1);
+    }
+}
+
+void
+cpp_error (pfile, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  cpp_print_containing_files (pfile);
+  cpp_print_file_and_line (pfile);
+  cpp_message (pfile, 1, msg, arg1, arg2, arg3);
+}
+
+/* Print error message but don't count it.  */
+
+void
+cpp_warning (pfile, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  if (CPP_OPTIONS (pfile)->inhibit_warnings)
+    return;
+
+  if (CPP_OPTIONS (pfile)->warnings_are_errors)
+    pfile->errors++;
+
+  cpp_print_containing_files (pfile);
+  cpp_print_file_and_line (pfile);
+  cpp_message (pfile, 0, msg, arg1, arg2, arg3);
+}
+
+/* Print an error message and maybe count it.  */
+
+void
+cpp_pedwarn (pfile, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  if (CPP_OPTIONS (pfile)->pedantic_errors)
+    cpp_error (pfile, msg, arg1, arg2, arg3);
+  else
+    cpp_warning (pfile, msg, arg1, arg2, arg3);
+}
+
+void
+cpp_error_with_line (pfile, line, column, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     int line, column;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  int i;
+  cpp_buffer *ip = cpp_file_buffer (pfile);
+
+  cpp_print_containing_files (pfile);
+
+  if (ip != NULL)
+    cpp_file_line_for_message (pfile, ip->nominal_fname, line, column);
+
+  cpp_message (pfile, 1, msg, arg1, arg2, arg3);
+}
+
+static void
+cpp_warning_with_line (pfile, line, column, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     int line, column;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  int i;
+  cpp_buffer *ip;
+
+  if (CPP_OPTIONS (pfile)->inhibit_warnings)
+    return;
+
+  if (CPP_OPTIONS (pfile)->warnings_are_errors)
+    pfile->errors++;
+
+  cpp_print_containing_files (pfile);
+
+  ip = cpp_file_buffer (pfile);
+
+  if (ip != NULL)
+    cpp_file_line_for_message (pfile, ip->nominal_fname, line, column);
+
+  cpp_message (pfile, 0, msg, arg1, arg2, arg3);
+}
+
+void
+cpp_pedwarn_with_line (pfile, line, column, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     int line;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  if (CPP_OPTIONS (pfile)->pedantic_errors)
+    cpp_error_with_line (pfile, column, line, msg, arg1, arg2, arg3);
+  else
+    cpp_warning_with_line (pfile, line, column, msg, arg1, arg2, arg3);
+}
+
+/* Report a warning (or an error if pedantic_errors)
+   giving specified file name and line number, not current.  */
+
+void
+cpp_pedwarn_with_file_and_line (pfile, file, line, msg, arg1, arg2, arg3)
+     cpp_reader *pfile;
+     char *file;
+     int line;
+     char *msg;
+     char *arg1, *arg2, *arg3;
+{
+  if (!CPP_OPTIONS (pfile)->pedantic_errors
+      && CPP_OPTIONS (pfile)->inhibit_warnings)
+    return;
+  if (file != NULL)
+    cpp_file_line_for_message (pfile, file, line, -1);
+  cpp_message (pfile, CPP_OPTIONS (pfile)->pedantic_errors,
+	       msg, arg1, arg2, arg3);
+}
+
+/* This defines "errno" properly for VMS, and gives us EACCES. */
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#ifndef VMS
+#ifndef HAVE_STRERROR
+extern int sys_nerr;
+#if defined(bsd4_4)
+extern const char *const sys_errlist[];
+#else
+extern char *sys_errlist[];
+#endif
+#else	/* HAVE_STRERROR */
+char *strerror ();
+#endif
+#else	/* VMS */
+char *strerror (int,...);
+#endif
+
+/*
+ * my_strerror - return the descriptive text associated with an `errno' code.
+ */
+
+char *
+my_strerror (errnum)
+     int errnum;
+{
+  char *result;
+
+#ifndef VMS
+#ifndef HAVE_STRERROR
+  result = (char *) ((errnum < sys_nerr) ? sys_errlist[errnum] : 0);
+#else
+  result = strerror (errnum);
+#endif
+#else	/* VMS */
+  /* VAXCRTL's strerror() takes an optional second argument, which only
+     matters when the first argument is EVMSERR.  However, it's simplest
+     just to pass it unconditionally.  `vaxc$errno' is declared in
+     <errno.h>, and maintained by the library in parallel with `errno'.
+     We assume that caller's `errnum' either matches the last setting of
+     `errno' by the library or else does not have the value `EVMSERR'.  */
+
+  result = strerror (errnum, vaxc$errno);
+#endif
+
+  if (!result)
+    result = "undocumented I/O error";
+
+  return result;
+}
+
+/* Error including a message from `errno'.  */
+
+void
+cpp_error_from_errno (pfile, name)
+     cpp_reader *pfile;
+     char *name;
+{
+  int i;
+  cpp_buffer *ip = cpp_file_buffer (pfile);
+
+  cpp_print_containing_files (pfile);
+
+  if (ip != NULL)
+    cpp_file_line_for_message (pfile, ip->nominal_fname, ip->lineno, -1);
+
+  cpp_message (pfile, 1, "%s: %s", name, my_strerror (errno));
+}
+
+void
+cpp_perror_with_name (pfile, name)
+     cpp_reader *pfile;
+     char *name;
+{
+  cpp_message (pfile, 1, "%s: %s: %s", progname, name, my_strerror (errno));
+}
+
+/* TODO:
+ * No pre-compiled header file support.
+ *
+ * Possibly different enum token codes for each C/C++ token.
+ *
+ * Should clean up remaining directives to that do_XXX functions
+ *   only take two arguments and all have command_reads_line.
+ *
+ * Find and cleanup remaining uses of static variables,
+ *
+ * Support for trigraphs.
+ *
+ * Support -dM flag (dump_all_macros).
+ *
+ * Support for_lint flag.
+ */