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Style: kill register and indent properly.
Let indx match netbsd flavor, to simplify diffs.
Show how many quotes were not closed.
Increase stack slightly, now that we're no longer bound by argspace.

/*	$OpenBSD: misc.c,v 1.12 1999/09/14 08:35:17 espie 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 1.12 1999/09/14 08:35:17 espie Exp $";
#endif
#endif /* not lint */

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


char *ep;		/* first free char in strspace */
static char *strspace;	/* string space for evaluation */
static char *endest;	/* end of string space	       */
static size_t strsize = STRSPMAX;
static size_t bufsize = BUFSIZE;
static int low_sp = 0;

pbent *buf;			/* push-back buffer	       */
pbent *bufbase;			/* the base for current ilevel */
pbent *bbase[MAXINP];		/* the base for each ilevel    */
pbent *bp; 			/* first available character   */
static pbent *endpbb;			/* end of push-back buffer     */


static void enlarge_bufspace();
static void enlarge_strspace();
/*
 * find the index of second str in the first str.
 */
ptrdiff_t
indx(s1, s2)
	const char *s1;
	const char *s2;
{
	char *t;

	t = strstr(s1, s2);
	if (t == NULL)
		return (-1);
	else
		return (t - s1);
}
/*
 *  putback - push character back onto input
 */
void
putback(c)
	pbent c;
{
	if (bp >= endpbb)
		enlarge_bufspace();
	*bp++ = c;
}

/*
 *  pbstr - push string back onto input
 *          putback is replicated to improve
 *          performance.
 */
void
pbstr(s)
	char *s;
{
	size_t n;

	n = strlen(s);
	while (endpbb - bp <= n)
		enlarge_bufspace();
	while (n > 0)
		*bp++ = s[--n];
}

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

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

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


void 
initspaces()
{
	int i;

	strspace = xalloc(strsize+1);
	ep = strspace;
	endest = strspace+strsize;
	buf = (pbent *)xalloc(bufsize * sizeof(pbent));
	bufbase = buf;
	bp = buf;
	endpbb = buf + bufsize;
	for (i = 0; i < MAXINP; i++)
		bbase[i] = buf;
}

/* XXX when chrsave is called, the current argument is
 * always topmost on the stack.  We make use of this to
 * duplicate it transparently, and to reclaim the correct
 * space when the stack is unwound.
 */
static
void enlarge_strspace()
{
	char *newstrspace;

	low_sp = sp;
	strsize *= 2;
	newstrspace = malloc(strsize + 1);
	if (!newstrspace)
		errx(1, "string space overflow");
	memcpy(newstrspace, strspace, strsize/2);
		/* reclaim memory in the easy, common case. */
	if (ep == strspace)
		free(strspace);
	mstack[sp].sstr = (mstack[sp].sstr-strspace) + newstrspace;
	ep = (ep-strspace) + newstrspace;
	strspace = newstrspace;
	endest = strspace + strsize;
}

static
void enlarge_bufspace()
{
	pbent *newbuf;
	int i;

	bufsize *= 2;
	newbuf = realloc(buf, bufsize*sizeof(pbent));
	if (!newbuf)
		errx(1, "too many characters pushed back");
	for (i = 0; i < MAXINP; i++)
		bbase[i] = (bbase[i]-buf)+newbuf;
	bp = (bp-buf)+newbuf;
	bufbase = (bufbase-buf)+newbuf;
	buf = newbuf;
	endpbb = buf+bufsize;
}

/*
 *  chrsave - put single char on string space
 */
void
chrsave(c)
	char c;
{
	if (ep >= endest) 
		enlarge_strspace();
	*ep++ = c;
}

/* 
 * so we reclaim what string space we can
 */
char * 
compute_prevep()
{
	if (fp+3 <= low_sp)
		{
		return strspace;
		}
	else
		{
		return mstack[fp+3].sstr;
		}
}

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

	if (active == outfile[n])
		errx(1, "undivert: diversion still active");
	rewind(outfile[n]);
	while ((c = getc(outfile[n])) != EOF)
		putc(c, active);
	(void) fclose(outfile[n]);
}

void
onintr(signo)
	int signo;
{
	errx(1, "interrupted.");
}

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

	for (n = 0; n < MAXOUT; n++)
		if (outfile[n] != NULL) {
			(void) fclose(outfile[n]);
		}
}

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

	if (p == NULL)
		err(1, "malloc");
	return p;
}

char *
xstrdup(s)
	const char *s;
{
	char *p = strdup(s);
	if (p == NULL)
		err(1, "strdup");
	return p;
}

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