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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: look.c,v 1.16 2003/11/17 17:12:10 espie 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 sccsid[] = "@(#)look.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

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

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <ohash.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"

static void *hash_alloc(size_t, void *);
static void hash_free(void *, size_t, void *);
static void *element_alloc(size_t, void *);
static void setup_definition(struct macro_definition *, const char *, 
    const char *);

static struct ohash_info macro_info = {
	offsetof(struct ndblock, name),
	NULL, hash_alloc, hash_free, element_alloc };

struct ohash macros;

/* Support routines for hash tables.  */
void *
hash_alloc(s, u)
	size_t s;
	void *u 	UNUSED;
{
	void *storage = xalloc(s, "hash alloc");
	if (storage)
		memset(storage, 0, s);
	return storage;
}

void
hash_free(p, s, u)
	void *p;
	size_t s	UNUSED;
	void *u 	UNUSED;
{
	free(p);
}

void *
element_alloc(s, u)
	size_t s;
	void *u 	UNUSED;
{
	return xalloc(s, "element alloc");
}

void
init_macros()
{
	ohash_init(&macros, 10, &macro_info);
}

/*
 * find name in the hash table
 */
ndptr 
lookup(const char *name)
{
	return ohash_find(&macros, ohash_qlookup(&macros, name));
}

struct macro_definition *
lookup_macro_definition(const char *name)
{
	ndptr p;

	p = ohash_find(&macros, ohash_qlookup(&macros, name));
	if (p)
		return p->d;
	else
		return NULL;
}

static void 
setup_definition(struct macro_definition *d, const char *defn, const char *name)
{
	ndptr p;

	if (strncmp(defn, BUILTIN_MARKER, sizeof(BUILTIN_MARKER)-1) == 0 &&
	    (p = macro_getbuiltin(defn+sizeof(BUILTIN_MARKER)-1)) != NULL) {
		d->type = macro_builtin_type(p);
		d->defn = xstrdup(defn+sizeof(BUILTIN_MARKER)-1);
	} else {
		if (!*defn)
			d->defn = null;
		else
			d->defn = xstrdup(defn);
		d->type = MACRTYPE;
	}
	if (STREQ(name, defn))
		d->type |= RECDEF;
}

static ndptr
create_entry(const char *name)
{
	const char *end = NULL;
	unsigned int i;
	ndptr n;

	i = ohash_qlookupi(&macros, name, &end);
	n = ohash_find(&macros, i);
	if (n == NULL) {
		n = ohash_create_entry(&macro_info, name, &end);
		ohash_insert(&macros, i, n);
		n->trace_flags = FLAG_NO_TRACE;
		n->builtin_type = MACRTYPE;
		n->d = NULL;
	}
	return n;
}

void
macro_define(const char *name, const char *defn)
{
	ndptr n = create_entry(name);
	if (n->d != NULL) {
		if (n->d->defn != null)
			free(n->d->defn);
	} else {
		n->d = xalloc(sizeof(struct macro_definition), NULL);
		n->d->next = NULL;
	}
	setup_definition(n->d, defn, name);
}

void
macro_pushdef(const char *name, const char *defn)
{
	ndptr n;
	struct macro_definition *d;
	
	n = create_entry(name);
	d = xalloc(sizeof(struct macro_definition), NULL);
	d->next = n->d;
	n->d = d;
	setup_definition(n->d, defn, name);
}

void
macro_undefine(const char *name)
{
	ndptr n = lookup(name);
	if (n != NULL) {
		struct macro_definition *r, *r2;

		for (r = n->d; r != NULL; r = r2) {
			r2 = r->next;
			if (r->defn != null)
				free(r->defn);
			free(r);
		}
		n->d = NULL;
	}
}

void
macro_popdef(const char *name)
{
	ndptr n = lookup(name);

	if (n != NULL) {
		struct macro_definition *r = n->d;
		if (r != NULL) {
			n->d = r->next;
			if (r->defn != null)
				free(r->defn);
			free(r);
		}
	}
}

void
macro_for_all(void (*f)(const char *, struct macro_definition *))
{
	ndptr n;
	unsigned int i;

	for (n = ohash_first(&macros, &i); n != NULL; 
	    n = ohash_next(&macros, &i))
		f(n->name, n->d);
}

void 
setup_builtin(const char *name, unsigned int type)
{
	ndptr n;

	n = create_entry(name);
	n->builtin_type = type;
	n->d = xalloc(sizeof(struct macro_definition), NULL);
	n->d->defn = xstrdup(name);
	n->d->type = type;
	n->d->next = NULL;
}

void
mark_traced(const char *name, int on)
{
	ndptr p;
	unsigned int i;

	if (name == NULL) {
		if (on)
			trace_flags |= TRACE_ALL;
		else
			trace_flags &= ~TRACE_ALL;
		for (p = ohash_first(&macros, &i); p != NULL; 
		    p = ohash_next(&macros, &i))
		    	p->trace_flags = FLAG_NO_TRACE;
	} else {
		p = create_entry(name);
		p->trace_flags = on;
	}
}

ndptr 
macro_getbuiltin(const char *name)
{
	ndptr p;

	p = lookup(name);
	if (p == NULL || p->builtin_type == MACRTYPE)
		return NULL;
	else
		return p;
}