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Make the m4 machine stack dynamically sized.

Fix strspace automatic extension.
The assumption that simply updating the current pointer works is false,
there are cases where previous entries on the stack would absorp vast
amounts of string space, and overload the non-updated entries.

To fix it, we use a shadow copy of the stack, which only records which
entries are pointers within strspace, so that a resize can adjust all
those pointers at once.

Reviewed by millert@

/*	$OpenBSD: extern.h,v 1.19 2000/07/02 01:17:00 espie Exp $	*/
/*	$NetBSD: extern.h,v 1.3 1996/01/13 23:25:24 pk Exp $	*/

/*-
 * Copyright (c) 1991, 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.
 *
 *	@(#)extern.h	8.1 (Berkeley) 6/6/93
 */

/* eval.c */
extern void	eval __P((const char *[], int, int));
extern void	expand __P((const char *[], int));
extern void	dodefine __P((const char *, const char *));

/* expr.c */
extern int	expr __P((const char *));

/* gnum4.c */
extern void 	addtoincludepath __P((const char *dirname));
extern struct input_file *fopen_trypath __P((struct input_file *, const char *filename));
extern void doindir __P((const char *[], int));
extern void dobuiltin __P((const char *[], int));
extern void dopatsubst __P((const char *[], int));
extern void doregexp __P((const char *[], int));

extern void doprintlineno __P((struct input_file *));
extern void doprintfilename __P((struct input_file *));
 

/* look.c */
extern ndptr	addent __P((const char *));
extern unsigned	hash __P((const char *));
extern ndptr	lookup __P((const char *));
extern void	remhash __P((const char *, int));

/* main.c */
extern void outputstr __P((const char *));
extern int builtin_type __P((const char *));

/* misc.c */
extern void	chrsave __P((int));
extern char 	*compute_prevep __P((void));
extern void	getdiv __P((int));
extern ptrdiff_t indx __P((const char *, const char *));
extern void 	initspaces __P((void));
extern void	killdiv __P((void));
extern void	onintr __P((int));
extern void	pbnum __P((int));
extern void	pbunsigned __P((unsigned long));
extern void	pbstr __P((const char *));
extern void	putback __P((int));
extern void	*xalloc __P((size_t));
extern char	*xstrdup __P((const char *));
extern void	usage __P((void));

extern int 	obtain_char __P((struct input_file *));
extern void	set_input __P((struct input_file *, FILE *, const char *));
extern void	release_input __P((struct input_file *));


extern ndptr hashtab[];		/* hash table for macros etc. */
extern stae *mstack;		/* stack of m4 machine */
extern char *sstack;		/* shadow stack, for string space extension */
extern FILE *active;		/* active output file pointer */
extern struct input_file infile[];/* input file stack (0=stdin) */
extern FILE *outfile[];		/* diversion array(0=bitbucket) */
extern int fp; 			/* m4 call frame pointer */
extern int ilevel;		/* input file stack pointer */
extern int oindex;		/* diversion index. */
extern int sp;			/* current m4 stack pointer */
extern char *bp;		/* first available character */
extern char *buf;		/* push-back buffer */
extern char *bufbase;		/* buffer base for this ilevel */
extern char *bbase[];		/* buffer base per ilevel */
extern char ecommt[MAXCCHARS+1];/* end character for comment */
extern char *ep;		/* first free char in strspace */
extern char lquote[MAXCCHARS+1];/* left quote character (`) */
extern char *m4wraps;		/* m4wrap string default. */
extern char *null;		/* as it says.. just a null. */
extern char rquote[MAXCCHARS+1];/* right quote character (') */
extern char scommt[MAXCCHARS+1];/* start character for comment */

extern int mimic_gnu;		/* behaves like gnu-m4 */