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Modify xalloc so that it also takes err(3)-like arguments.
Write an xrealloc wrapper that works the same way, and use it as well.

People who feel like it may want to add more explicit error messages to
all the places m4 can fail allocating memory...

okay tedu@

/*	$OpenBSD: main.c,v 1.64 2003/11/17 17:12:10 espie Exp $	*/
/*	$NetBSD: main.c,v 1.12 1997/02/08 23:54:49 cgd 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. 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) 1989, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: main.c,v 1.64 2003/11/17 17:12:10 espie Exp $";
#endif
#endif /* not lint */

/*
 * main.c
 * Facility: m4 macro processor
 * by: oz
 */

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

ndptr hashtab[HASHSIZE];	/* hash table for macros etc.  */
stae *mstack;		 	/* stack of m4 machine         */
char *sstack;		 	/* shadow stack, for string space extension */
static size_t STACKMAX;		/* current maximum size of stack */
int sp; 			/* current m4  stack pointer   */
int fp; 			/* m4 call frame pointer       */
struct input_file infile[MAXINP];/* input file stack (0=stdin)  */
FILE **outfile;			/* diversion array(0=bitbucket)*/
int maxout;
FILE *active;			/* active output file pointer  */
int ilevel = 0; 		/* input file stack pointer    */
int oindex = 0; 		/* diversion index..	       */
char *null = "";                /* as it says.. just a null..  */
char *m4wraps = "";             /* m4wrap string default..     */
char lquote[MAXCCHARS+1] = {LQUOTE};	/* left quote character  (`)   */
char rquote[MAXCCHARS+1] = {RQUOTE};	/* right quote character (')   */
char scommt[MAXCCHARS+1] = {SCOMMT};	/* start character for comment */
char ecommt[MAXCCHARS+1] = {ECOMMT};	/* end character for comment   */
int  synch_lines = 0;		/* line synchronisation for C preprocessor */

struct keyblk {
        char    *knam;          /* keyword name */
        int     ktyp;           /* keyword type */
};

struct keyblk keywrds[] = {	/* m4 keywords to be installed */
	{ "include",      INCLTYPE },
	{ "sinclude",     SINCTYPE },
	{ "define",       DEFITYPE },
	{ "defn",         DEFNTYPE },
	{ "divert",       DIVRTYPE | NOARGS },
	{ "expr",         EXPRTYPE },
	{ "eval",         EXPRTYPE },
	{ "substr",       SUBSTYPE },
	{ "ifelse",       IFELTYPE },
	{ "ifdef",        IFDFTYPE },
	{ "len",          LENGTYPE },
	{ "incr",         INCRTYPE },
	{ "decr",         DECRTYPE },
	{ "dnl",          DNLNTYPE | NOARGS },
	{ "changequote",  CHNQTYPE | NOARGS },
	{ "changecom",    CHNCTYPE | NOARGS },
	{ "index",        INDXTYPE },
#ifdef EXTENDED
	{ "paste",        PASTTYPE },
	{ "spaste",       SPASTYPE },
    	/* Newer extensions, needed to handle gnu-m4 scripts */
	{ "indir",        INDIRTYPE},
	{ "builtin",      BUILTINTYPE},
	{ "patsubst",	  PATSTYPE},
	{ "regexp",	  REGEXPTYPE},
	{ "esyscmd",	  ESYSCMDTYPE},
	{ "__file__",	  FILENAMETYPE | NOARGS},
	{ "__line__",	  LINETYPE | NOARGS},
#endif
	{ "popdef",       POPDTYPE },
	{ "pushdef",      PUSDTYPE },
	{ "dumpdef",      DUMPTYPE | NOARGS },
	{ "shift",        SHIFTYPE | NOARGS },
	{ "translit",     TRNLTYPE },
	{ "undefine",     UNDFTYPE },
	{ "undivert",     UNDVTYPE | NOARGS },
	{ "divnum",       DIVNTYPE | NOARGS },
	{ "maketemp",     MKTMTYPE },
	{ "errprint",     ERRPTYPE | NOARGS },
	{ "m4wrap",       M4WRTYPE | NOARGS },
	{ "m4exit",       EXITTYPE | NOARGS },
	{ "syscmd",       SYSCTYPE },
	{ "sysval",       SYSVTYPE | NOARGS },
	{ "traceon",	  TRACEONTYPE | NOARGS },
	{ "traceoff",	  TRACEOFFTYPE | NOARGS },

#if defined(unix) || defined(__unix__) 
	{ "unix",         SELFTYPE | NOARGS },
#else
#ifdef vms
	{ "vms",          SELFTYPE | NOARGS },
#endif
#endif
};

#define MAXKEYS	(sizeof(keywrds)/sizeof(struct keyblk))

extern int optind;
extern char *optarg;

#define MAXRECORD 50
static struct position {
	char *name;
	unsigned long line;
} quotes[MAXRECORD], paren[MAXRECORD];

static void record(struct position *, int);
static void dump_stack(struct position *, int);

static void macro(void);
static void initkwds(void);
static ndptr inspect(int, char *);
static int do_look_ahead(int, const char *);
static void reallyoutputstr(const char *);
static void reallyputchar(int);

static void enlarge_stack(void);

int main(int, char *[]);

int
main(int argc, char *argv[])
{
	int c;
	int n;
	char *p;

	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
		signal(SIGINT, onintr);

	init_macros();
	initkwds();
	initspaces();
	STACKMAX = INITSTACKMAX;

	mstack = (stae *)xalloc(sizeof(stae) * STACKMAX, NULL);
	sstack = (char *)xalloc(STACKMAX, NULL);

	maxout = 0;
	outfile = NULL;
	resizedivs(MAXOUT);

	while ((c = getopt(argc, argv, "gst:d:D:U:o:I:")) != -1)
		switch(c) {

		case 'D':               /* define something..*/
			for (p = optarg; *p; p++)
				if (*p == '=')
					break;
			if (*p)
				*p++ = EOS;
			dodefine(optarg, p);
			break;
		case 'I':
			addtoincludepath(optarg);
			break;
		case 'U':               /* undefine...       */
			macro_popdef(optarg);
			break;
		case 'g':
			mimic_gnu = 1;
			break;
		case 'd':
			set_trace_flags(optarg);
			break;
		case 's':
			synch_lines = 1;
			break;
		case 't':
			mark_traced(optarg, 1);
			break;
		case 'o':
			trace_file(optarg);
                        break;
		case '?':
			usage();
		}

        argc -= optind;
        argv += optind;

	active = stdout;		/* default active output     */
	bbase[0] = bufbase;
        if (!argc) {
 		sp = -1;		/* stack pointer initialized */
		fp = 0; 		/* frame pointer initialized */
		set_input(infile+0, stdin, "stdin");
					/* default input (naturally) */
		macro();
	} else
		for (; argc--; ++argv) {
			p = *argv;
			if (p[0] == '-' && p[1] == EOS)
				set_input(infile, stdin, "stdin");
			else if (fopen_trypath(infile, p) == NULL)
				err(1, "%s", p);
			sp = -1;
			fp = 0; 
			macro();
		    	release_input(infile);
		}

	if (*m4wraps) { 		/* anything for rundown ??   */
		ilevel = 0;		/* in case m4wrap includes.. */
		bufbase = bp = buf;	/* use the entire buffer   */
		pbstr(m4wraps); 	/* user-defined wrapup act   */
		macro();		/* last will and testament   */
	}

	if (active != stdout)
		active = stdout;	/* reset output just in case */
	for (n = 1; n < maxout; n++)	/* default wrap-up: undivert */
		if (outfile[n] != NULL)
			getdiv(n);
					/* remove bitbucket if used  */
	if (outfile[0] != NULL) {
		(void) fclose(outfile[0]);
	}

	return 0;
}

/*
 * Look ahead for `token'.
 * (on input `t == token[0]')
 * Used for comment and quoting delimiters.
 * Returns 1 if `token' present; copied to output.
 *         0 if `token' not found; all characters pushed back
 */
static int
do_look_ahead(int t, const char *token)
{
	int i;

	assert((unsigned char)t == (unsigned char)token[0]);

	for (i = 1; *++token; i++) {
		t = gpbc();
		if (t == EOF || (unsigned char)t != (unsigned char)*token) {
			putback(t);
			while (--i)
				putback(*--token);
			return 0;
		}
	}
	return 1;
}

#define LOOK_AHEAD(t, token) (t != EOF && 		\
    (unsigned char)(t)==(unsigned char)(token)[0] && 	\
    do_look_ahead(t,token))

/*
 * macro - the work horse..
 */
static void
macro(void)
{
	char token[MAXTOK+1];
	int t, l;
	ndptr p;
	int  nlpar;

	cycle {
		t = gpbc();
		if (t == '_' || isalpha(t)) {
			p = inspect(t, token);
			if (p != NULL)
				putback(l = gpbc());
			if (p == NULL || (l != LPAREN && 
			    (macro_getdef(p)->type & NEEDARGS) != 0))
				outputstr(token);
			else {
		/*
		 * real thing.. First build a call frame:
		 */
				pushf(fp);	/* previous call frm */
				pushf(macro_getdef(p)->type); /* type of the call  */
				pushf(is_traced(p));
				pushf(0);	/* parenthesis level */
				fp = sp;	/* new frame pointer */
		/*
		 * now push the string arguments:
		 */
				pushs1(macro_getdef(p)->defn);	/* defn string */
				pushs1((char *)macro_name(p));	/* macro name  */
				pushs(ep);	      	/* start next..*/

				if (l != LPAREN && PARLEV == 0)  {   
				    /* no bracks  */
					chrsave(EOS);

					if (sp == STACKMAX)
						errx(1, "internal stack overflow");
					eval((const char **) mstack+fp+1, 2, 
					    CALTYP, TRACESTATUS);

					ep = PREVEP;	/* flush strspace */
					sp = PREVSP;	/* previous sp..  */
					fp = PREVFP;	/* rewind stack...*/
				}
			}
		} else if (t == EOF) {
			if (sp > -1) {
				warnx( "unexpected end of input, unclosed parenthesis:");
				dump_stack(paren, PARLEV);
				exit(1);
			}
			if (ilevel <= 0)
				break;			/* all done thanks.. */
			release_input(infile+ilevel--);
			emit_synchline();
			bufbase = bbase[ilevel];
			continue;
		}
	/*
	 * non-alpha token possibly seen..
	 * [the order of else if .. stmts is important.]
	 */
		else if (LOOK_AHEAD(t,lquote)) {	/* strip quotes */
			nlpar = 0;
			record(quotes, nlpar++);
			/*
			 * Opening quote: scan forward until matching
			 * closing quote has been found.
			 */
			do {

				l = gpbc();
				if (LOOK_AHEAD(l,rquote)) {
					if (--nlpar > 0)
						outputstr(rquote);
				} else if (LOOK_AHEAD(l,lquote)) {
					record(quotes, nlpar++);
					outputstr(lquote);
				} else if (l == EOF) {
					if (nlpar == 1)
						warnx("unclosed quote:");
					else
						warnx("%d unclosed quotes:", nlpar);
					dump_stack(quotes, nlpar);
					exit(1);
				} else {
					if (nlpar > 0) {
						if (sp < 0)
							reallyputchar(l);
						else
							CHRSAVE(l);
					}
				}
			}
			while (nlpar != 0);
		}

		else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
			reallyoutputstr(scommt);

			for(;;) {
				t = gpbc();
				if (LOOK_AHEAD(t, ecommt)) {
					reallyoutputstr(ecommt);
					break;
				}
				if (t == EOF)
					break;
				reallyputchar(t);
			}
		}

		else if (sp < 0) {		/* not in a macro at all */
			reallyputchar(t);	/* output directly..	 */
		}

		else switch(t) {

		case LPAREN:
			if (PARLEV > 0)
				chrsave(t);
			while (isspace(l = gpbc()))
				;		/* skip blank, tab, nl.. */
			putback(l);
			record(paren, PARLEV++);
			break;

		case RPAREN:
			if (--PARLEV > 0)
				chrsave(t);
			else {			/* end of argument list */
				chrsave(EOS);

				if (sp == STACKMAX)
					errx(1, "internal stack overflow");

				eval((const char **) mstack+fp+1, sp-fp, 
				    CALTYP, TRACESTATUS);

				ep = PREVEP;	/* flush strspace */
				sp = PREVSP;	/* previous sp..  */
				fp = PREVFP;	/* rewind stack...*/
			}
			break;

		case COMMA:
			if (PARLEV == 1) {
				chrsave(EOS);		/* new argument   */
				while (isspace(l = gpbc()))
					;
				putback(l);
				pushs(ep);
			} else
				chrsave(t);
			break;

		default:
			if (LOOK_AHEAD(t, scommt)) {
				char *p;
				for (p = scommt; *p; p++)
					chrsave(*p);
				for(;;) {
					t = gpbc();
					if (LOOK_AHEAD(t, ecommt)) {
						for (p = ecommt; *p; p++)
							chrsave(*p);
						break;
					}
					if (t == EOF)
					    break;
					CHRSAVE(t);
				}
			} else
				CHRSAVE(t);		/* stack the char */
			break;
		}
	}
}

/* 
 * output string directly, without pushing it for reparses. 
 */
void
outputstr(const char *s)
{
	if (sp < 0)
		reallyoutputstr(s);
	else
		while (*s)
			CHRSAVE(*s++);
}

void
reallyoutputstr(const char *s)
{
	if (synch_lines) {
		while (*s) {
			fputc(*s, active);
			if (*s++ == '\n') {
				infile[ilevel].synch_lineno++;
				if (infile[ilevel].synch_lineno != 
				    infile[ilevel].lineno)
					do_emit_synchline();
			}
		}
	} else
		fputs(s, active);
}

void
reallyputchar(int c)
{
	putc(c, active);
	if (synch_lines && c == '\n') {
		infile[ilevel].synch_lineno++;
		if (infile[ilevel].synch_lineno != infile[ilevel].lineno)
			do_emit_synchline();
	}
}

/*
 * build an input token..
 * consider only those starting with _ or A-Za-z. 
 */
static ndptr
inspect(int c, char *tp) 
{
	char *name = tp;
	char *etp = tp+MAXTOK;
	ndptr p;
	unsigned int h;
	
	*tp++ = c;

	while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
		*tp++ = c;
	if (c != EOF)
		PUTBACK(c);
	*tp = EOS;
	/* token is too long, it won't match anything, but it can still
	 * be output. */
	if (tp == ep) {
		outputstr(name);
		while (isalnum(c = gpbc()) || c == '_') {
			if (sp < 0)
				reallyputchar(c);
			else
				CHRSAVE(c);
		}
		*name = EOS;
		return NULL;
	}

	p = ohash_find(&macros, ohash_qlookupi(&macros, name, (const char **)&tp));
	if (p == NULL)
		return NULL;
	if (macro_getdef(p) == NULL)
		return NULL;
	return p;
}

/*
 * initkwds - initialise m4 keywords as fast as possible. 
 * This very similar to install, but without certain overheads,
 * such as calling lookup. Malloc is not used for storing the 
 * keyword strings, since we simply use the static pointers
 * within keywrds block.
 */
static void
initkwds(void)
{
	unsigned int type;
	int i;

	for (i = 0; i < MAXKEYS; i++) {
		type = keywrds[i].ktyp & TYPEMASK;
		if ((keywrds[i].ktyp & NOARGS) == 0)
			type |= NEEDARGS;
		setup_builtin(keywrds[i].knam, type);
	}
}

static void
record(struct position *t, int lev)
{
	if (lev < MAXRECORD) {
		t[lev].name = CURRENT_NAME;
		t[lev].line = CURRENT_LINE;
	}
}

static void
dump_stack(struct position *t, int lev)
{
	int i;

	for (i = 0; i < lev; i++) {
		if (i == MAXRECORD) {
			fprintf(stderr, "   ...\n");
			break;
		}
		fprintf(stderr, "   %s at line %lu\n", 
			t[i].name, t[i].line);
	}
}


static void 
enlarge_stack(void)
{
	STACKMAX += STACKMAX/2;
	mstack = xrealloc(mstack, sizeof(stae) * STACKMAX, 
	    "Evaluation stack overflow (%lu)", 
	    (unsigned long)STACKMAX);
	sstack = xrealloc(sstack, STACKMAX,
	    "Evaluation stack overflow (%lu)", 
	    (unsigned long)STACKMAX);
}