initial import of NetBSD tree

3 files changed, 827 insertions, 0 deletions

diff --git a/usr.bin/unifdef/Makefile b/usr.bin/unifdef/Makefile
new file mode 100644
index 00000000000..88450d25a3d
--- /dev/null
+++ b/usr.bin/unifdef/Makefile
@@ -0,0 +1,6 @@
+#	$NetBSD: Makefile,v 1.3 1994/12/07 00:33:47 jtc Exp $
+#	@(#)Makefile	8.1 (Berkeley) 6/6/93
+
+PROG=	unifdef
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/unifdef/unifdef.1 b/usr.bin/unifdef/unifdef.1
new file mode 100644
index 00000000000..3e862297258
--- /dev/null
+++ b/usr.bin/unifdef/unifdef.1
@@ -0,0 +1,167 @@
+.\"	$NetBSD: unifdef.1,v 1.4 1994/12/07 00:33:48 jtc Exp $
+.\"
+.\" Copyright (c) 1985, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Dave Yost.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)unifdef.1	8.2 (Berkeley) 4/1/94
+.\"
+.Dd April 1, 1994
+.Dt UNIFDEF 1
+.Os BSD 4.3
+.Sh NAME
+.Nm unifdef
+.Nd remove ifdef'ed lines
+.Sh SYNOPSIS
+.Nm unifdef
+.Op Fl clt
+.Oo
+.Fl D Ns Ar sym
+.Fl U Ns Ar sym
+.Fl iD Ns Ar sym
+.Fl iD Ns Ar sym
+.Oc
+.Ar ...
+.Op Ar file
+.Sh DESCRIPTION
+.Nm Unifdef
+is useful for removing ifdef'ed lines
+from a file while otherwise leaving the file alone.
+.Nm Unifdef
+acts on
+#ifdef, #ifndef, #else, and #endif lines,
+and it knows only enough about C
+to know when one of these is inactive
+because it is inside
+a comment,
+or a single or double quote.
+Parsing for quotes is very simplistic:
+when it finds an open quote,
+it ignores everything (except escaped quotes)
+until it finds a close quote, and
+it will not complain if it gets
+to the end of a line and finds no backslash for continuation.
+.Pp
+Available options:
+.Bl -tag -width Ds -compact
+.It Fl D Ns Ar sym
+.It Fl U Ns Ar sym
+Specify which symbols to define or undefine.
+and the lines inside those ifdefs will be copied to the output or removed as
+appropriate.
+The ifdef, ifndef, else, and endif lines associated with
+.Ar sym
+will also be removed.
+Ifdefs involving symbols you don't specify
+and ``#if'' control lines
+are untouched and copied out
+along with their associated
+ifdef, else, and endif lines.
+If an ifdef X occurs nested inside another ifdef X, then the
+inside ifdef is treated as if it were an unrecognized symbol.
+If the same symbol appears in more than one argument,
+the last occurrence dominates.
+.Pp
+.It Fl c
+If the
+.Fl c
+flag is specified,
+then the operation of
+.Nm unifdef
+is complemented,
+i.e. the lines that would have been removed or blanked
+are retained and vice versa.
+.Pp
+.It Fl l
+Replace removed lines with blank lines
+instead of deleting them.
+.It Fl t
+Disables parsing for C comments and quotes, which is useful
+for plain text.
+.Pp
+.It Fl iD Ns Ar sym
+.It Fl iU Ns Ar sym
+Ignore ifdefs.
+If your C code uses ifdefs to delimit non-C lines,
+such as comments
+or code which is under construction,
+then you must tell
+.Nm unifdef
+which symbols are used for that purpose so that it won't try to parse
+for quotes and comments
+inside those ifdefs.
+One specifies ignored ifdefs with
+.Fl iD Ns Ar sym
+and
+.Fl iU Ns Ar sym
+similar to
+.Fl D Ns Ar sym
+and
+.Fl U Ns Ar sym
+above.
+.El
+.Pp
+.Nm Unifdef
+copies its output to
+.Em stdout
+and will take its input from
+.Em stdin
+if no
+.Ar file
+argument is given.
+.Pp
+.Nm Unifdef
+works nicely with the
+.Fl D Ns Ar sym
+option added to
+.Xr diff 1
+as of the 4.1 Berkeley Software Distribution.
+.Sh SEE ALSO
+.Xr diff 1
+.Sh DIAGNOSTICS
+Inappropriate else or endif.
+.br
+Premature
+.Tn EOF
+with line numbers of the unterminated #ifdefs.
+.Pp
+Exit status is 0 if output is exact copy of input, 1 if not, 2 if trouble.
+.Sh BUGS
+Should try to deal with ``#if'' lines.
+.Pp
+Doesn't work correctly if input contains null characters.
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.3 .
diff --git a/usr.bin/unifdef/unifdef.c b/usr.bin/unifdef/unifdef.c
new file mode 100644
index 00000000000..8b331b72890
--- /dev/null
+++ b/usr.bin/unifdef/unifdef.c
@@ -0,0 +1,654 @@
+/*	$NetBSD: unifdef.c,v 1.4 1994/12/20 01:44:07 jtc Exp $	*/
+
+/*
+ * Copyright (c) 1985, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Dave Yost.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1985, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)unifdef.c	8.1 (Berkeley) 6/6/93";
+#endif
+static char rcsid[] = "$NetBSD: unifdef.c,v 1.4 1994/12/20 01:44:07 jtc Exp $";
+#endif /* not lint */
+
+/*
+ * unifdef - remove ifdef'ed lines
+ *
+ *  Warning: will not work correctly if input contains null characters.
+ *
+ *  Wishlist:
+ *      provide an option which will append the name of the
+ *        appropriate symbol after #else's and #endif's
+ *      provide an option which will check symbols after
+ *        #else's and #endif's to see that they match their
+ *        corresponding #ifdef or #ifndef
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+
+#define BSS
+FILE *input;
+#ifndef YES
+#define YES 1
+#define NO  0
+#endif/*YES */
+typedef int Bool;
+
+char *progname BSS;
+char *filename BSS;
+char text BSS;          /* -t option in effect: this is a text file */
+char lnblank BSS;       /* -l option in effect: blank deleted lines */
+char complement BSS;    /* -c option in effect: complement the operation */
+
+#define MAXSYMS 100
+char *symname[MAXSYMS] BSS; /* symbol name */
+char true[MAXSYMS] BSS;     /* -Dsym */
+char ignore[MAXSYMS] BSS;   /* -iDsym or -iUsym */
+char insym[MAXSYMS] BSS;    /* state: false, inactive, true */
+#define SYM_INACTIVE 0      /* symbol is currently inactive */
+#define SYM_FALSE    1      /* symbol is currently false */
+#define SYM_TRUE     2      /* symbol is currently true  */
+
+char nsyms BSS;
+char incomment BSS;         /* inside C comment */
+
+#define QUOTE_NONE   0
+#define QUOTE_SINGLE 1
+#define QUOTE_DOUBLE 2
+char inquote BSS;           /* inside single or double quotes */
+int exitstat BSS;
+
+int 	error __P((int, int, int));
+int 	findsym __P((char *));
+void 	flushline __P((Bool));
+int 	getlin __P((char *, int, FILE *, int));
+void	pfile __P((void));
+void	prname __P((void));
+char   *skipcomment __P((char *));
+char   *skipquote __P((char *, int));
+
+int
+main (argc, argv)
+int argc;
+char **argv;
+{
+    char **curarg;
+    register char *cp;
+    register char *cp1;
+    char ignorethis;
+
+    progname = argv[0][0] ? argv[0] : "unifdef";
+
+    for (curarg = &argv[1]; --argc > 0; curarg++) {
+	if (*(cp1 = cp = *curarg) != '-')
+	    break;
+	if (*++cp1 == 'i') {
+	    ignorethis = YES;
+	    cp1++;
+	} else
+	    ignorethis = NO;
+	if (   (   *cp1 == 'D'
+		|| *cp1 == 'U'
+	       )
+	    && cp1[1] != '\0'
+	   ) {
+	    register int symind;
+
+	    if ((symind = findsym (&cp1[1])) < 0) {
+		if (nsyms >= MAXSYMS) {
+		    prname ();
+		    fprintf (stderr, "too many symbols.\n");
+		    exit (2);
+		}
+		symind = nsyms++;
+		symname[symind] = &cp1[1];
+		insym[symind] = SYM_INACTIVE;
+	    }
+	    ignore[symind] = ignorethis;
+	    true[symind] = *cp1 == 'D' ? YES : NO;
+	} else if (ignorethis)
+	    goto unrec;
+	else if (strcmp (&cp[1], "t") == 0)
+	    text = YES;
+	else if (strcmp (&cp[1], "l") == 0)
+	    lnblank = YES;
+	else if (strcmp (&cp[1], "c") == 0)
+	    complement = YES;
+	else {
+ unrec:
+	    prname ();
+	    fprintf (stderr, "unrecognized option: %s\n", cp);
+	    goto usage;
+	}
+    }
+    if (nsyms == 0) {
+ usage:
+	fprintf (stderr, "\
+Usage: %s [-l] [-t] [-c] [[-Dsym] [-Usym] [-iDsym] [-iUsym]]... [file]\n\
+    At least one arg from [-D -U -iD -iU] is required\n", progname);
+	exit (2);
+    }
+
+    if (argc > 1) {
+	prname ();
+	fprintf (stderr, "can only do one file.\n");
+    } else if (argc == 1) {
+	filename = *curarg;
+	if ((input = fopen (filename, "r")) != NULL) {
+	    pfile();
+	    (void) fclose (input);
+	} else {
+	    prname ();
+	    fprintf (stderr, "can't open ");
+	    perror(*curarg);
+	}
+    } else {
+	filename = "[stdin]";
+	input = stdin;
+	pfile();
+    }
+
+    (void) fflush (stdout);
+    exit (exitstat);
+}
+
+/* types of input lines: */
+typedef int Linetype;
+#define LT_PLAIN       0   /* ordinary line */
+#define LT_TRUE        1   /* a true  #ifdef of a symbol known to us */
+#define LT_FALSE       2   /* a false #ifdef of a symbol known to us */
+#define LT_OTHER       3   /* an #ifdef of a symbol not known to us */
+#define LT_IF          4   /* an #ifdef of a symbol not known to us */
+#define LT_ELSE        5   /* #else */
+#define LT_ENDIF       6   /* #endif */
+#define LT_LEOF        7   /* end of file */
+Linetype checkline __P((int *));
+
+typedef int Reject_level;
+Reject_level reject BSS;    /* 0 or 1: pass thru; 1 or 2: ignore comments */
+#define REJ_NO          0
+#define REJ_IGNORE      1
+#define REJ_YES         2
+int doif __P((int, int, Reject_level, int));
+
+int linenum BSS;    /* current line number */
+int stqcline BSS;   /* start of current coment or quote */
+char *errs[] = {
+#define NO_ERR      0
+			"",
+#define END_ERR     1
+			"",
+#define ELSE_ERR    2
+			"Inappropriate else",
+#define ENDIF_ERR   3
+			"Inappropriate endif",
+#define IEOF_ERR    4
+			"Premature EOF in ifdef",
+#define CEOF_ERR    5
+			"Premature EOF in comment",
+#define Q1EOF_ERR   6
+			"Premature EOF in quoted character",
+#define Q2EOF_ERR   7
+			"Premature EOF in quoted string"
+};
+
+/* States for inif arg to doif */
+#define IN_NONE 0
+#define IN_IF   1
+#define IN_ELSE 2
+
+void
+pfile ()
+{
+    reject = REJ_NO;
+    (void) doif (-1, IN_NONE, reject, 0);
+    return;
+}
+
+int
+doif (thissym, inif, prevreject, depth)
+register int thissym;   /* index of the symbol who was last ifdef'ed */
+int inif;               /* YES or NO we are inside an ifdef */
+Reject_level prevreject;/* previous value of reject */
+int depth;              /* depth of ifdef's */
+{
+    register Linetype lineval;
+    register Reject_level thisreject;
+    int doret;          /* tmp return value of doif */
+    int cursym;         /* index of the symbol returned by checkline */
+    int stline;         /* line number when called this time */
+
+    stline = linenum;
+    for (;;) {
+	switch (lineval = checkline (&cursym)) {
+	case LT_PLAIN:
+	    flushline (YES);
+	    break;
+
+	case LT_TRUE:
+	case LT_FALSE:
+	    thisreject = reject;
+	    if (lineval == LT_TRUE)
+		insym[cursym] = SYM_TRUE;
+	    else {
+		if (reject != REJ_YES)
+		    reject = ignore[cursym] ? REJ_IGNORE : REJ_YES;
+		insym[cursym] = SYM_FALSE;
+	    }
+	    if (ignore[cursym])
+		flushline (YES);
+	    else {
+		exitstat = 1;
+		flushline (NO);
+	    }
+	    if ((doret = doif (cursym, IN_IF, thisreject, depth + 1)) != NO_ERR)
+		return error (doret, stline, depth);
+	    break;
+
+	case LT_IF:
+	case LT_OTHER:
+	    flushline (YES);
+	    if ((doret = doif (-1, IN_IF, reject, depth + 1)) != NO_ERR)
+		return error (doret, stline, depth);
+	    break;
+
+	case LT_ELSE:
+	    if (inif != IN_IF)
+		return error (ELSE_ERR, linenum, depth);
+	    inif = IN_ELSE;
+	    if (thissym >= 0) {
+		if (insym[thissym] == SYM_TRUE) {
+		    reject = ignore[thissym] ? REJ_IGNORE : REJ_YES;
+		    insym[thissym] = SYM_FALSE;
+		} else { /* (insym[thissym] == SYM_FALSE) */
+		    reject = prevreject;
+		    insym[thissym] = SYM_TRUE;
+		}
+		if (!ignore[thissym]) {
+		    flushline (NO);
+		    break;
+		}
+	    }
+	    flushline (YES);
+	    break;
+
+	case LT_ENDIF:
+	    if (inif == IN_NONE)
+		return error (ENDIF_ERR, linenum, depth);
+	    if (thissym >= 0) {
+		insym[thissym] = SYM_INACTIVE;
+		reject = prevreject;
+		if (!ignore[thissym]) {
+		    flushline (NO);
+		    return NO_ERR;
+		}
+	    }
+	    flushline (YES);
+	    return NO_ERR;
+
+	case LT_LEOF: {
+	    int err;
+	    err =   incomment
+		  ? CEOF_ERR
+		  : inquote == QUOTE_SINGLE
+		  ? Q1EOF_ERR
+		  : inquote == QUOTE_DOUBLE
+		  ? Q2EOF_ERR
+		  : NO_ERR;
+	    if (inif != IN_NONE) {
+		if (err != NO_ERR)
+		    (void) error (err, stqcline, depth);
+		return error (IEOF_ERR, stline, depth);
+	    } else if (err != NO_ERR)
+		return error (err, stqcline, depth);
+	    else
+		return NO_ERR;
+	    }
+	}
+    }
+}
+
+#define endsym(c) (!isalpha (c) && !isdigit (c) && c != '_')
+
+#define MAXLINE 256
+char tline[MAXLINE] BSS;
+
+Linetype
+checkline (cursym)
+int *cursym;    /* if LT_TRUE or LT_FALSE returned, set this to sym index */
+{
+    register char *cp;
+    register char *symp;
+    char *scp;
+    Linetype retval;
+#   define KWSIZE 8
+    char keyword[KWSIZE];
+
+    linenum++;
+    if (getlin (tline, sizeof tline, input, NO) == EOF)
+	return LT_LEOF;
+
+    retval = LT_PLAIN;
+    if (   *(cp = tline) != '#'
+	|| incomment
+	|| inquote == QUOTE_SINGLE
+	|| inquote == QUOTE_DOUBLE
+       )
+	goto eol;
+
+    cp = skipcomment (++cp);
+    symp = keyword;
+    while (!endsym (*cp)) {
+	*symp = *cp++;
+	if (++symp >= &keyword[KWSIZE])
+	    goto eol;
+    }
+    *symp = '\0';
+
+    if (strcmp (keyword, "ifdef") == 0) {
+	retval = YES;
+	goto ifdef;
+    } else if (strcmp (keyword, "ifndef") == 0) {
+	retval = NO;
+ ifdef:
+	scp = cp = skipcomment (++cp);
+	if (incomment) {
+	    retval = LT_PLAIN;
+	    goto eol;
+	}
+	{
+	    int symind;
+
+	    if ((symind = findsym (scp)) >= 0)
+		retval = (retval ^ true[*cursym = symind])
+			 ? LT_FALSE : LT_TRUE;
+	    else
+		retval = LT_OTHER;
+	}
+    } else if (strcmp (keyword, "if") == 0)
+	retval = LT_IF;
+    else if (strcmp (keyword, "else") == 0)
+	retval = LT_ELSE;
+    else if (strcmp (keyword, "endif") == 0)
+	retval = LT_ENDIF;
+
+ eol:
+    if (!text && reject != REJ_IGNORE)
+	for (; *cp; ) {
+	    if (incomment)
+		cp = skipcomment (cp);
+	    else if (inquote == QUOTE_SINGLE)
+		cp = skipquote (cp, QUOTE_SINGLE);
+	    else if (inquote == QUOTE_DOUBLE)
+		cp = skipquote (cp, QUOTE_DOUBLE);
+	    else if (*cp == '/' && cp[1] == '*')
+		cp = skipcomment (cp);
+	    else if (*cp == '\'')
+		cp = skipquote (cp, QUOTE_SINGLE);
+	    else if (*cp == '"')
+		cp = skipquote (cp, QUOTE_DOUBLE);
+	    else
+		cp++;
+	}
+    return retval;
+}
+
+/*
+ *  Skip over comments and stop at the next charaacter
+ *  position that is not whitespace.
+ */
+char *
+skipcomment (cp)
+register char *cp;
+{
+    if (incomment)
+	goto inside;
+    for (;; cp++) {
+	while (*cp == ' ' || *cp == '\t')
+	    cp++;
+	if (text)
+	    return cp;
+	if (   cp[0] != '/'
+	    || cp[1] != '*'
+	   )
+	    return cp;
+	cp += 2;
+	if (!incomment) {
+	    incomment = YES;
+	    stqcline = linenum;
+	}
+ inside:
+	for (;;) {
+	    for (; *cp != '*'; cp++)
+		if (*cp == '\0')
+		    return cp;
+	    if (*++cp == '/') {
+		incomment = NO;
+		break;
+	    }
+	}
+    }
+}
+
+/*
+ *  Skip over a quoted string or character and stop at the next charaacter
+ *  position that is not whitespace.
+ */
+char *
+skipquote (cp, type)
+register char *cp;
+register int type;
+{
+    register char qchar;
+
+    qchar = type == QUOTE_SINGLE ? '\'' : '"';
+
+    if (inquote == type)
+	goto inside;
+    for (;; cp++) {
+	if (*cp != qchar)
+	    return cp;
+	cp++;
+	inquote = type;
+	stqcline = linenum;
+ inside:
+	for (; ; cp++) {
+	    if (*cp == qchar)
+		break;
+	    if (   *cp == '\0'
+		|| *cp == '\\' && *++cp == '\0'
+	       )
+		return cp;
+	}
+	inquote = QUOTE_NONE;
+    }
+}
+
+/*
+ *  findsym - look for the symbol in the symbol table.
+ *            if found, return symbol table index,
+ *            else return -1.
+ */
+int
+findsym (str)
+char *str;
+{
+    register char *cp;
+    register char *symp;
+    register int symind;
+    register char chr;
+
+    for (symind = 0; symind < nsyms; ++symind) {
+	if (insym[symind] == SYM_INACTIVE) {
+	    for ( symp = symname[symind], cp = str
+		; *symp && *cp == *symp
+		; cp++, symp++
+		)
+		continue;
+	    chr = *cp;
+	    if (*symp == '\0' && endsym (chr))
+		return symind;
+	}
+    }
+    return -1;
+}
+
+/*
+ *   getlin - expands tabs if asked for
+ *            and (if compiled in) treats form-feed as an end-of-line
+ */
+int
+getlin (line, maxline, inp, expandtabs)
+register char *line;
+int maxline;
+FILE *inp;
+int expandtabs;
+{
+    int tmp;
+    register int num;
+    register int chr;
+#ifdef  FFSPECIAL
+    static char havechar = NO;  /* have leftover char from last time */
+    static char svchar BSS;
+#endif/*FFSPECIAL */
+
+    num = 0;
+#ifdef  FFSPECIAL
+    if (havechar) {
+	havechar = NO;
+	chr = svchar;
+	goto ent;
+    }
+#endif/*FFSPECIAL */
+    while (num + 8 < maxline) {   /* leave room for tab */
+	chr = getc (inp);
+	if (isprint (chr)) {
+#ifdef  FFSPECIAL
+ ent:
+#endif/*FFSPECIAL */
+	    *line++ = chr;
+	    num++;
+	} else
+	    switch (chr) {
+	    case EOF:
+		return EOF;
+
+	    case '\t':
+		if (expandtabs) {
+		    num += tmp = 8 - (num & 7);
+		    do
+			*line++ = ' ';
+		    while (--tmp);
+		    break;
+		}
+	    default:
+		*line++ = chr;
+		num++;
+		break;
+
+	    case '\n':
+		*line = '\n';
+		num++;
+		goto end;
+
+#ifdef  FFSPECIAL
+	    case '\f':
+		if (++num == 1)
+		    *line = '\f';
+		else {
+		    *line = '\n';
+		    havechar = YES;
+		    svchar = chr;
+		}
+		goto end;
+#endif/*FFSPECIAL */
+	    }
+    }
+ end:
+    *++line = '\0';
+    return num;
+}
+
+void
+flushline (keep)
+Bool keep;
+{
+    if ((keep && reject != REJ_YES) ^ complement) {
+	register char *line = tline;
+	register FILE *out = stdout;
+	register char chr;
+
+	while (chr = *line++)
+	    putc (chr, out);
+    } else if (lnblank)
+	putc ('\n', stdout);
+    return;
+}
+
+void
+prname ()
+{
+    fprintf (stderr, "%s: ", progname);
+    return;
+}
+
+int
+error (err, line, depth)
+int err;        /* type of error & index into error string array */
+int line;       /* line number */
+int depth;      /* how many ifdefs we are inside */
+{
+    if (err == END_ERR)
+	return err;
+
+    prname ();
+
+#ifndef TESTING
+    fprintf (stderr, "Error in %s line %d: %s.\n", filename, line, errs[err]);
+#else/* TESTING */
+    fprintf (stderr, "Error in %s line %d: %s. ", filename, line, errs[err]);
+    fprintf (stderr, "ifdef depth: %d\n", depth);
+#endif/*TESTING */
+
+    exitstat = 2;
+    return depth > 1 ? IEOF_ERR : END_ERR;
+}