egcs projects compiler system

Exact copy of the snapshot, except for the removal of
	texinfo/
	gcc/ch/
	libchill/

1 files changed, 1735 insertions, 0 deletions

diff --git a/gnu/egcs/gcc/cpphash.c b/gnu/egcs/gcc/cpphash.c
new file mode 100644
index 00000000000..1d8a104460e
--- /dev/null
+++ b/gnu/egcs/gcc/cpphash.c
@@ -0,0 +1,1735 @@
+/* Part of CPP library.  (Macro handling.)
+   Copyright (C) 1986, 87, 89, 92-95, 1996, 1998 Free Software Foundation, Inc.
+   Written by Per Bothner, 1994.
+   Based on CCCP program 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!  */
+
+#include "config.h"
+#include "system.h"
+#include "cpplib.h"
+#include "cpphash.h"
+#undef abort
+
+static int comp_def_part	 PARAMS ((int, U_CHAR *, int, U_CHAR *,
+					  int, int));
+static int change_newlines	 PARAMS ((U_CHAR *, int));
+static void push_macro_expansion PARAMS ((cpp_reader *,
+					  U_CHAR *, int, HASHNODE *));
+static int unsafe_chars		 PARAMS ((int, int));
+
+#define SKIP_WHITE_SPACE(p) do { while (is_hor_space[*p]) p++; } while (0)
+#define CPP_IS_MACRO_BUFFER(PBUF) ((PBUF)->data != NULL)
+#define FORWARD(N) CPP_FORWARD (CPP_BUFFER (pfile), (N))
+
+extern char *version_string;
+
+/* The arglist structure is built by create_definition to tell
+   collect_expansion 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_expansion 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;
+};
+
+/* 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;
+};
+
+
+/* Return hash function on name.  must be compatible with the one
+   computed a step at a time, elsewhere  */
+
+int
+hashf (name, len, hashsize)
+     register const U_CHAR *name;
+     register int len;
+     int hashsize;
+{
+  register int r = 0;
+
+  while (len--)
+    r = HASHSTEP (r, *name++);
+
+  return MAKE_POS (r) % hashsize;
+}
+
+/* Find the most recent hash node for name "name" (ending with first
+   non-identifier char) installed by cpp_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.  */
+
+HASHNODE *
+cpp_lookup (pfile, name, len, hash)
+     cpp_reader *pfile ATTRIBUTE_UNUSED;
+     const U_CHAR *name;
+     int len;
+     int hash;
+{
+  register const U_CHAR *bp;
+  register HASHNODE *bucket;
+
+  if (len < 0)
+    {
+      for (bp = name; is_idchar[*bp]; bp++);
+      len = bp - name;
+    }
+
+  if (hash < 0)
+    hash = hashf (name, len, HASHSIZE);
+
+  bucket = pfile->hashtab[hash];
+  while (bucket)
+    {
+      if (bucket->length == len && strncmp (bucket->name, name, len) == 0)
+	return bucket;
+      bucket = bucket->next;
+    }
+  return (HASHNODE *) 0;
+}
+
+/*
+ * Delete a hash node.  Some weirdness to free junk from macros.
+ * More such weirdness will have to be added if you define more hash
+ * types that need it.
+ */
+
+/* Note that the DEFINITION of a macro is removed from the hash table
+   but its storage is not freed.  This would be a storage leak
+   except that it is not reasonable to keep undefining and redefining
+   large numbers of macros many times.
+   In any case, this is necessary, because a macro can be #undef'd
+   in the middle of reading the arguments to a call to it.
+   If #undef freed the DEFINITION, that would crash.  */
+
+void
+delete_macro (hp)
+     HASHNODE *hp;
+{
+
+  if (hp->prev != NULL)
+    hp->prev->next = hp->next;
+  if (hp->next != NULL)
+    hp->next->prev = hp->prev;
+
+  /* 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;
+
+  if (hp->type == T_MACRO)
+    {
+      DEFINITION *d = hp->value.defn;
+      struct reflist *ap, *nextap;
+
+      for (ap = d->pattern; ap != NULL; ap = nextap)
+	{
+	  nextap = ap->next;
+	  free (ap);
+	}
+      if (d->nargs >= 0)
+	free (d->args.argnames);
+      free (d);
+    }
+
+  free (hp);
+}
+
+/* Install a name in the main hash table, even if it is already there.
+   Name stops with first non alphanumeric, except leading '#'.
+   Caller must check against redefinition if that is desired.
+   delete_macro () removes things installed by cpp_install () in fifo order.
+   this is important because of the `defined' special symbol used
+   in #if, and also if pushdef/popdef directives are ever implemented.
+
+   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.  */
+
+HASHNODE *
+cpp_install (pfile, name, len, type, value, hash)
+     cpp_reader *pfile;
+     U_CHAR *name;
+     int len;
+     enum node_type type;
+     const char *value;
+     int hash;
+{
+  register HASHNODE *hp;
+  register int i, bucket;
+  register U_CHAR *p;
+
+  if (len < 0)
+    {
+      p = name;
+      while (is_idchar[*p])
+	p++;
+      len = p - name;
+    }
+
+  if (hash < 0)
+    hash = hashf (name, len, HASHSIZE);
+
+  i = sizeof (HASHNODE) + len + 1;
+  hp = (HASHNODE *) xmalloc (i);
+  bucket = hash;
+  hp->bucket_hdr = &pfile->hashtab[bucket];
+  hp->next = pfile->hashtab[bucket];
+  pfile->hashtab[bucket] = hp;
+  hp->prev = NULL;
+  if (hp->next != NULL)
+    hp->next->prev = hp;
+  hp->type = type;
+  hp->length = len;
+  hp->value.cpval = value;
+  hp->name = ((U_CHAR *) hp) + sizeof (HASHNODE);
+  bcopy (name, hp->name, len);
+  hp->name[len] = 0;
+  return hp;
+}
+
+static int
+macro_cleanup (pbuf, pfile)
+     cpp_buffer *pbuf;
+     cpp_reader *pfile ATTRIBUTE_UNUSED;
+{
+  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;
+}
+
+
+/* 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)
+    {
+      cpp_fatal (pfile, "internal error: limit < buf in collect_expansion");
+      limit = buf; /* treat it like a null defn */
+    }
+
+  /* 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);
+  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++ = '\r';
+  *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 '#':
+	      /* # 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]
+		      || (*p == 'L' && p + 1 < limit && (p[1] == '\'' ||
+							 p[1] == '"')))
+		    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
+	     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]
+	      && !(id_len == 1 && c == 'L' && (*p == '\'' || *p == '"')))
+	    {
+	      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;
+		      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 "\r " marker to prevent token pasting.
+         But not if "inside a string" (which in ANSI mode
+         happens only for -D option).  */
+      *exp_p++ = '\r';
+      *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.  */
+
+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, 0);
+  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 ((size_t) (limit - bp) > REST_EXTENSION_LENGTH
+		  && !strncmp (rest_extension, bp, REST_EXTENSION_LENGTH))
+		{
+		  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
+	    /* Per C9x, missing white space after the name in a #define
+	       of an object-like macro is always a constraint violation. */
+	    cpp_pedwarn (pfile,
+			 "missing white space after `#define %.*s'",
+			 sym_length, symname);
+	}
+      /* 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;
+}
+
+/*
+ * 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;
+  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++;
+  CPP_OPTIONS (pfile)->no_line_commands++;
+  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;
+  CPP_OPTIONS (pfile)->no_line_commands--;
+  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;
+{
+  const char *buf;
+  int len;
+  cpp_buffer *ip;
+
+  switch (hp->type)
+    {
+    case T_FILE:
+    case T_BASE_FILE:
+      {
+	ip = CPP_BUFFER (pfile);
+	if (hp->type == T_BASE_FILE)
+	  {
+	    while (CPP_PREV_BUFFER (ip) != CPP_NULL_BUFFER (pfile))
+	      ip = CPP_PREV_BUFFER (ip);
+	  }
+	else
+	  {
+	    ip = CPP_BUFFER (pfile);
+	    while (!ip->nominal_fname && ip != CPP_NULL_BUFFER (pfile))
+	      ip = CPP_PREV_BUFFER (ip);
+	  }
+
+	buf = ip->nominal_fname;
+
+	if (!buf)
+	  buf = "";
+	CPP_RESERVE (pfile, 3 + 4 * strlen (buf));
+	quote_string (pfile, buf);
+	return;
+      }
+
+    case T_INCLUDE_LEVEL:
+      {
+	int true_indepth = 0;
+	ip = CPP_BUFFER (pfile);
+	for (; ip != CPP_NULL_BUFFER (pfile); ip = CPP_PREV_BUFFER (ip))
+	  if (ip->fname != NULL)
+	    true_indepth++;
+
+	CPP_RESERVE (pfile, 10);
+	sprintf (CPP_PWRITTEN (pfile), "%d", true_indepth);
+	CPP_ADJUST_WRITTEN (pfile, strlen (CPP_PWRITTEN (pfile)));
+	return;
+      }
+
+    case T_VERSION:
+      len = strlen (version_string);
+      CPP_RESERVE (pfile, 3 + len);
+      CPP_PUTC_Q (pfile, '"');
+      CPP_PUTS_Q (pfile, version_string, len);
+      CPP_PUTC_Q (pfile, '"');
+      CPP_NUL_TERMINATE_Q (pfile);
+      return;
+
+    case T_CONST:
+      buf = hp->value.cpval;
+      if (!buf)
+	return;
+      if (*buf == '\0')
+	buf = "\r ";
+
+      len = strlen (buf);
+      CPP_RESERVE (pfile, len + 1);
+      CPP_PUTS_Q (pfile, buf, len);
+      CPP_NUL_TERMINATE_Q (pfile);
+      return;
+
+    case T_STDC:
+      CPP_RESERVE (pfile, 2);
+#ifdef STDC_0_IN_SYSTEM_HEADERS
+      ip = CPP_BUFFER (pfile);
+      while (!ip->nominal_fname && ip != CPP_NULL_BUFFER (pfile))
+	ip = CPP_PREV_BUFFER (ip);
+      if (ip->system_header_p
+	  && !cpp_lookup (pfile, (U_CHAR *) "__STRICT_ANSI__", 15, -1))
+	CPP_PUTC_Q (pfile, '0');
+      else
+#endif
+	CPP_PUTC_Q (pfile, '1');
+      CPP_NUL_TERMINATE_Q (pfile);
+      return;
+
+    case T_SPECLINE:
+      {
+	long line;
+	cpp_buf_line_and_col (cpp_file_buffer (pfile), &line, NULL);
+
+	CPP_RESERVE (pfile, 10);
+	sprintf (CPP_PWRITTEN (pfile), "%ld", line);
+	CPP_ADJUST_WRITTEN (pfile, strlen (CPP_PWRITTEN (pfile)));
+	return;
+      }
+
+    case T_DATE:
+    case T_TIME:
+      {
+	struct tm *timebuf;
+
+	CPP_RESERVE (pfile, 20);
+	timebuf = timestamp (pfile);
+	if (hp->type == T_DATE)
+	  sprintf (CPP_PWRITTEN (pfile), "\"%s %2d %4d\"",
+		   monthnames[timebuf->tm_mon],
+		   timebuf->tm_mday, timebuf->tm_year + 1900);
+	else
+	  sprintf (CPP_PWRITTEN (pfile), "\"%02d:%02d:%02d\"",
+		   timebuf->tm_hour, timebuf->tm_min, timebuf->tm_sec);
+
+	CPP_ADJUST_WRITTEN (pfile, strlen (CPP_PWRITTEN (pfile)));
+	return;
+      }
+
+    default:
+      cpp_fatal (pfile, "cpplib internal error: invalid special hash type");
+      return;
+    }
+}
+
+/* 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.  */
+
+void
+macroexpand (pfile, hp)
+     cpp_reader *pfile;
+     HASHNODE *hp;
+{
+  int nargs;
+  DEFINITION *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
+  /* 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
+
+  cpp_buf_line_and_col (cpp_file_buffer (pfile), &start_line, &start_column);
+
+  /* Check for and handle special symbols. */
+  if (hp->type != T_MACRO)
+    {
+      special_symbol (hp, pfile);
+      xbuf_len = CPP_WRITTEN (pfile) - old_written;
+      xbuf = (U_CHAR *) xmalloc (xbuf_len + 1);
+      CPP_SET_WRITTEN (pfile, old_written);
+      bcopy (CPP_PWRITTEN (pfile), xbuf, xbuf_len + 1);
+      push_macro_expansion (pfile, xbuf, xbuf_len, hp);
+      CPP_BUFFER (pfile)->has_escapes = 1;
+      return;
+    }
+
+  defn = hp->value.defn;
+  nargs = defn->nargs;
+  pfile->output_escapes++;
+
+  if (nargs >= 0)
+    {
+      enum cpp_token token = CPP_EOF;
+
+      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 open-parenthesis before 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 if 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
+			     a string or char token. */
+			  if (is_space[c])
+			    {
+			      if (CPP_WRITTEN (pfile) > (unsigned) arg->stringified
+				  && (CPP_PWRITTEN (pfile))[-1] == '\r')
+				{
+				  /* "\r " 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 ((char *) 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] == '\r')
+			l1--;
+		      else if (l1[-1] == '-')
+			{
+			  if (l1 != p1 + 1 && l1[-2] == '\r')
+			    l1 -= 2;
+			  else
+			    break;
+			}
+		      else
+			break;
+		    }
+		}
+
+	      /* Delete any no-reexpansion marker that precedes
+	         an identifier at the beginning of the argument. */
+	      if (p1[0] == '\r' && p1[1] == '-')
+		p1 += 2;
+
+	      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++] = '\r';
+		  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++] = '\r';
+		  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)
+	    {
+	      cpp_fatal (pfile, "internal_error: buffer overrun in macroexpand");
+	      return;
+	    }
+	}
+
+      /* 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;
+}
+
+/* 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':    case 'p':    case 'P':
+      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;
+
+    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 '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 'Q':  case 'R':  case 'S':  case 'T':
+    case 'U':  case 'V':  case 'W':  case 'X':  case 'Y':  case 'Z':
+    letter:
+    /* 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;
+}
+
+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);
+  if (mbuf == NULL)
+    return;
+  mbuf->cleanup = macro_cleanup;
+  mbuf->data = hp;
+
+  /* The first chars of the expansion should be a "\r " 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] == '\r' && xbuf[1] == ' '
+      && (is_idchar[xbuf[2]] || xbuf[2] == '(' || xbuf[2] == '\''
+	  || xbuf[2] == '\"'))
+    mbuf->cur += 2;
+
+  /* Likewise, avoid the extra space at the end of the macro expansion
+     if this is safe.  We can do a better job here since we can know
+     what the next char will be.  */
+  if (xbuf_len >= 3
+      && mbuf->rlimit[-2] == '\r'
+      && mbuf->rlimit[-1] == ' ')
+    {
+      int c1 = mbuf->rlimit[-3];
+      int c2 = CPP_BUF_PEEK (CPP_PREV_BUFFER (CPP_BUFFER (pfile)));
+      if (c2 == EOF || !unsafe_chars (c1, c2))
+	mbuf->rlimit -= 2;
+    }
+}
+
+/* Return zero if two DEFINITIONs are isomorphic.  */
+
+int
+compare_defs (pfile, d1, d2)
+     cpp_reader *pfile;
+     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 (CPP_PEDANTIC (pfile)
+      && 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;
+
+  return comp_def_part (first, p1, d1->length - (p1 - d1->expansion),
+			p2, d2->length - (p2 - d2->expansion), 1);
+}
+
+/* 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);
+}
+
+/* Dump the definition of macro MACRO on stdout.  The format is suitable
+   to be read back in again. */
+
+void
+dump_definition (pfile, macro)
+     cpp_reader *pfile;
+     MACRODEF macro;
+{
+  DEFINITION *defn = macro.defn;
+
+  CPP_RESERVE (pfile, macro.symlen + sizeof "#define ");
+  CPP_PUTS_Q (pfile, "#define ", sizeof "#define " -1);
+  CPP_PUTS_Q (pfile, macro.symnam, macro.symlen);
+
+  if (defn->nargs == -1)
+    {
+      CPP_PUTC_Q (pfile, ' ');
+
+      /* The first and last two characters of a macro expansion are
+	 always "\r "; this needs to be trimmed out.
+	 So we need length-4 chars of space, plus one for the NUL.  */
+      CPP_RESERVE (pfile, defn->length - 4 + 1);
+      CPP_PUTS_Q (pfile, defn->expansion + 2, defn->length - 4);
+      CPP_NUL_TERMINATE_Q (pfile);
+    }
+  else
+    {
+      struct reflist *r;
+      unsigned char *argnames = xstrdup (defn->args.argnames);
+      unsigned char **argv = alloca (defn->nargs * sizeof(char *));
+      int *argl = alloca (defn->nargs * sizeof(int));
+      unsigned char *x;
+      int i;
+
+      /* First extract the argument list. */
+      x = argnames;
+      i = defn->nargs;
+      while (i--)
+	{
+	  argv[i] = x;
+	  while (*x != ',' && *x != '\0') x++;
+	  argl[i] = x - argv[i];
+	  if (*x == ',')
+	    {
+	      *x = '\0';
+	      x += 2;  /* skip the space after the comma */
+	    }
+	}
+      
+      /* Now print out the argument list. */
+      CPP_PUTC_Q (pfile, '(');
+      for (i = 0; i < defn->nargs; i++)
+	{
+	  CPP_RESERVE (pfile, argl[i] + 2);
+	  CPP_PUTS_Q (pfile, argv[i], argl[i]);
+	  if (i < defn->nargs-1)
+	    CPP_PUTS_Q (pfile, ", ", 2);
+	}
+
+      if (defn->rest_args)
+	CPP_PUTS (pfile, "...) ", 5);
+      else
+	CPP_PUTS (pfile, ") ", 2);
+
+      /* Now the definition. */
+      x = defn->expansion;
+      for (r = defn->pattern; r; r = r->next)
+      {
+	i = r->nchars;
+	if (*x == '\r') x += 2, i -= 2;
+	/* i chars for macro text, plus the length of the macro
+	   argument name, plus one for a stringify marker, plus two for
+	   each concatenation marker. */
+	CPP_RESERVE (pfile,
+		     i + argl[r->argno] + r->stringify
+		     + (r->raw_before + r->raw_after) * 2);
+
+	if (i > 0) CPP_PUTS_Q (pfile, x, i);
+	if (r->raw_before)
+	  CPP_PUTS_Q (pfile, "##", 2);
+	if (r->stringify)
+	  CPP_PUTC_Q (pfile, '#');
+	CPP_PUTS_Q (pfile, argv[r->argno], argl[r->argno]);
+	if (r->raw_after && !(r->next && r->next->nchars == 0
+			      && r->next->raw_before))
+	  CPP_PUTS_Q (pfile, "##", 2);
+
+	x += i;
+      }
+
+      i = defn->length - (x - defn->expansion) - 2;
+      if (*x == '\r') x += 2, i -= 2;
+      if (i > 0) CPP_PUTS (pfile, x, i);
+      CPP_NUL_TERMINATE (pfile);
+    }
+}