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NetBSD changes: use POSIX regex routines and fix more buff oflow
Can't use mkstemp() so go back to mktemp and open(2) with sane flags.
Now uses rcmdsh and fixes memory leak in NetBSD POSIX regex support
(leak fixed by Charles Amos <amos@umiacs.umd.edu>).

/*	$OpenBSD: lookup.c,v 1.5 1996/08/22 20:33:21 millert Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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
/* from: static char sccsid[] = "@(#)lookup.c	8.1 (Berkeley) 6/9/93"; */
static char *rcsid = "$OpenBSD: lookup.c,v 1.5 1996/08/22 20:33:21 millert Exp $";
#endif /* not lint */

#include "defs.h"

	/* symbol types */
#define VAR	1
#define CONST	2

struct syment {
	int	s_type;
	char	*s_name;
	struct	namelist *s_value;
	struct	syment *s_next;
};

static struct syment *hashtab[HASHSIZE];

/*
 * Define a variable from a command line argument.
 */
void
define(name)
	char *name;
{
	register char *cp, *s;
	register struct namelist *nl;
	struct namelist *value;

	if (debug)
		printf("define(%s)\n", name);

	cp = strchr(name, '=');
	if (cp == NULL)
		value = NULL;
	else if (cp[1] == '\0') {
		*cp = '\0';
		value = NULL;
	} else if (cp[1] != '(') {
		*cp++ = '\0';
		value = makenl(cp);
	} else {
		nl = NULL;
		*cp++ = '\0';
		do
			cp++;
		while (*cp == ' ' || *cp == '\t');
		for (s = cp; ; s++) {
			switch (*s) {
			case ')':
				*s = '\0';
			case '\0':
				break;
			case ' ':
			case '\t':
				*s++ = '\0';
				while (*s == ' ' || *s == '\t')
					s++;
				if (*s == ')')
					*s = '\0';
				break;
			default:
				continue;
			}
			if (nl == NULL)
				value = nl = makenl(cp);
			else {
				nl->n_next = makenl(cp);
				nl = nl->n_next;
			}
			if (*s == '\0')
				break;
			cp = s;
		}
	}
	(void) lookup(name, REPLACE, value);
}

/*
 * Lookup name in the table and return a pointer to it.
 * LOOKUP - just do lookup, return NULL if not found.
 * INSERT - insert name with value, error if already defined.
 * REPLACE - insert or replace name with value.
 */

struct namelist *
lookup(name, action, value)
	char *name;
	int action;
	struct namelist *value;
{
	register unsigned n;
	register char *cp;
	register struct syment *s;
	char buf[BUFSIZ];

	if (debug)
		printf("lookup(%s, %d, %x)\n", name, action, value);

	n = 0;
	for (cp = name; *cp; )
		n += *cp++;
	n %= HASHSIZE;

	for (s = hashtab[n]; s != NULL; s = s->s_next) {
		if (strcmp(name, s->s_name))
			continue;
		if (action != LOOKUP) {
			if (action != INSERT || s->s_type != CONST) {
				(void)snprintf(buf, sizeof(buf),
					"%s redefined", name);
				yyerror(buf);
			}
		}
		return(s->s_value);
	}

	if (action == LOOKUP) {
		(void)snprintf(buf, sizeof(buf), "%s undefined", name);
		yyerror(buf);
		return(NULL);
	}

	s = ALLOC(syment);
	if (s == NULL)
		fatal("ran out of memory\n");
	s->s_next = hashtab[n];
	hashtab[n] = s;
	s->s_type = action == INSERT ? VAR : CONST;
	s->s_name = name;
	s->s_value = value;
	return(value);
}