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adjust to ohash being in libutil now, and to the interface changes.
fix potential integer overflows in memory allocation (mostly for pedagogical
purposes, these are unlikely to overflow in practice)
move the rest of lst.lib stuff into its own directory.

/*	$OpenBSD: extern.h,v 1.54 2014/05/12 19:11:19 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. 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(const char *[], int, int, int);
extern void	dodefine(const char *, const char *);
extern unsigned long expansion_id;

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

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

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

extern void doesyscmd(const char *);
extern void getdivfile(const char *);
extern void doformat(const char *[], int);

/* look.c */

#define FLAG_UNTRACED 0
#define FLAG_TRACED 1
#define FLAG_NO_TRACE 2

extern void	init_macros(void);
extern ndptr	lookup(const char *);
extern void mark_traced(const char *, int);
extern struct ohash macros;

extern struct macro_definition *lookup_macro_definition(const char *);
extern void	macro_define(const char *, const char *);
extern void	macro_pushdef(const char *, const char *);
extern void	macro_popdef(const char *);
extern void	macro_undefine(const char *);
extern void	setup_builtin(const char *, unsigned int);
extern void	macro_for_all(void (*)(const char *, struct macro_definition *));
#define macro_getdef(p)		((p)->d)
#define macro_name(p)		((p)->name)
#define macro_builtin_type(p)	((p)->builtin_type)
#define is_traced(p) ((p)->trace_flags == FLAG_NO_TRACE ? (trace_flags & TRACE_ALL) : (p)->trace_flags)

extern ndptr macro_getbuiltin(const char *);

/* main.c */
extern void outputstr(const char *);
extern void do_emit_synchline(void);
extern int exit_code;
#define emit_synchline() do { if (synch_lines) do_emit_synchline(); } while(0)

/* misc.c */
extern void	chrsave(int);
extern char	*compute_prevep(void);
extern void	getdiv(int);
extern ptrdiff_t indx(const char *, const char *);
extern void	initspaces(void);
extern void	killdiv(void);
extern void	onintr(int);
extern void	pbnum(int);
extern void	pbnumbase(int, int, int);
extern void	pbunsigned(unsigned long);
extern void	pbstr(const char *);
extern void	pushback(int);
extern void	*xalloc(size_t, const char *, ...);
extern void	*xcalloc(size_t, size_t, const char *, ...);
extern void	*xrealloc(void *, size_t, const char *, ...);
extern void	*xreallocarray(void *, size_t, size_t, const char *, ...);
extern char	*xstrdup(const char *);
extern void	usage(void);
extern void	resizedivs(int);
extern size_t	buffer_mark(void);
extern void	dump_buffer(FILE *, size_t);
extern void	__dead m4errx(int, const char *, ...);

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

/* speeded-up versions of chrsave/pushback */
#define PUSHBACK(c)				\
	do {					\
		if (bp >= endpbb)		\
			enlarge_bufspace();	\
		*bp++ = (c);			\
	} while(0)

#define CHRSAVE(c)				\
	do {					\
		if (ep >= endest)		\
			enlarge_strspace();	\
		*ep++ = (c);			\
	} while(0)

/* and corresponding exposure for local symbols */
extern void enlarge_bufspace(void);
extern void enlarge_strspace(void);
extern unsigned char *endpbb;
extern char *endest;

/* trace.c */
extern unsigned int trace_flags;
#define TRACE_ALL	512
extern void trace_file(const char *);
extern size_t trace(const char **, int, struct input_file *);
extern void finish_trace(size_t);
extern void set_trace_flags(const char *);
extern FILE *traceout;

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 maxout;		/* maximum number of diversions */
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 unsigned char *bp;	/* first available character */
extern unsigned char *buf;	/* push-back buffer */
extern unsigned char *bufbase;	/* buffer base for this ilevel */
extern unsigned 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 int maxwraps;		/* size of m4wraps array */
extern int wrapindex;		/* current index in m4wraps */

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  synch_lines;	/* line synchronisation directives */

extern int mimic_gnu;		/* behaves like gnu-m4 */
extern int prefix_builtins;	/* prefix builtin macros with m4_ */