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cgd: add a typedef which describes elements in the push-back buffer.  Make
that typedef 'short'.  'char' (which was previously used) because char
may be unsigned and ((char)EOF) != EOF if that is the case.  That was
causing the (char)EOF (0xff) pushed back in main to be interepreted as
a character, and, in some cases, to be written to the output.  'short'
was used rather than 'signed char' because if the latter is used,
0xff characters in the input would confuse m4.  (No point in introducing
(more?) 8-bit lossage.)

/*	$OpenBSD: misc.c,v 1.6 1997/12/10 20:24:17 deraadt Exp $	*/
/*	$NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ozan Yigit at York University.
 *
 * 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
#if 0
static char sccsid[] = "@(#)misc.c	8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: misc.c,v 1.6 1997/12/10 20:24:17 deraadt Exp $";
#endif
#endif /* not lint */

#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"
#include "pathnames.h"

/*
 * find the index of second str in the first str.
 */
int
indx(s1, s2)
char *s1;
char *s2;
{
	register char *t;
	register char *p;
	register char *m;

	for (p = s1; *p; p++) {
		for (t = p, m = s2; *m && *m == *t; m++, t++);
		if (!*m)
			return (p - s1);
	}
	return (-1);
}
/*
 *  putback - push character back onto input
 */
void
putback(c)
pbent c;
{
	if (bp < endpbb)
		*bp++ = c;
	else
		oops("too many characters pushed back");
}

/*
 *  pbstr - push string back onto input
 *          putback is replicated to improve
 *          performance.
 */
void
pbstr(s)
register char *s;
{
	register char *es;
	pbent *zp;

	es = s;
	zp = bp;

	while (*es)
		es++;
	es--;
	while (es >= s)
		if (zp < endpbb)
			*zp++ = *es--;
	if ((bp = zp) == endpbb)
		oops("too many characters pushed back");
}

/*
 *  pbnum - convert number to string, push back on input.
 */
void
pbnum(n)
int n;
{
	register int num;

	num = (n < 0) ? -n : n;
	do {
		putback(num % 10 + '0');
	}
	while ((num /= 10) > 0);

	if (n < 0)
		putback('-');
}

/*
 *  chrsave - put single char on string space
 */
void
chrsave(c)
char c;
{
	if (ep < endest)
		*ep++ = c;
	else
		oops("string space overflow");
}

/*
 * read in a diversion file, and dispose it.
 */
void
getdiv(n)
int n;
{
	register int c;
	register FILE *dfil;

	if (active == outfile[n])
		oops("%s: diversion still active.", "undivert");
	(void) fclose(outfile[n]);
	outfile[n] = NULL;
	m4temp[UNIQUE] = n + '0';
	if ((dfil = fopen(m4temp, "r")) == NULL)
		oops("%s: cannot undivert.", m4temp);
	else
		while ((c = getc(dfil)) != EOF)
			putc(c, active);
	(void) fclose(dfil);

#ifdef vms
	if (remove(m4temp))
#else
	if (unlink(m4temp) == -1)
#endif
		oops("%s: cannot unlink.", m4temp);
}

void
onintr(signo)
	int signo;
{
	oops("interrupted.");
}

/*
 * killdiv - get rid of the diversion files
 */
void
killdiv()
{
	register int n;

	for (n = 0; n < MAXOUT; n++)
		if (outfile[n] != NULL) {
			(void) fclose(outfile[n]);
			m4temp[UNIQUE] = n + '0';
#ifdef vms
			(void) remove(m4temp);
#else
			(void) unlink(m4temp);
#endif
		}
}

char *
xalloc(n)
unsigned long n;
{
	register char *p = malloc(n);

	if (p == NULL)
		oops("malloc: %s", strerror(errno));
	return p;
}

char *
xstrdup(s)
const char *s;
{
	register char *p = strdup(s);
	if (p == NULL)
		oops("strdup: %s", strerror(errno));
	return p;
}

char *
basename(s)
register char *s;
{
	register char *p;
	extern char *strrchr();

	if ((p = strrchr(s, '/')) == NULL)
		return s;

	return ++p;
}

void
usage()
{
	fprintf(stderr, "usage: m4 [-Dname[=val]] [-Uname]\n");
	exit(1);
}

#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#ifdef __STDC__
oops(const char *fmt, ...)
#else
oops(fmt, va_alist)
	char *fmt;
	va_dcl
#endif
{
	va_list ap;
#ifdef __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "%s: ", progname);
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	exit(1);
	/* NOTREACHED */
}