1/* $OpenBSD: expr.c,v 1.18 2010/09/07 19:58:09 marco Exp $ */
2/*
3 * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17#include <sys/cdefs.h>
18__FBSDID("$FreeBSD$");
19
20#include <stdint.h>
21#include <stdio.h>
22#include <stddef.h>
23#include "mdef.h"
24#include "extern.h"
25
26int32_t end_result;
27static const char *copy_toeval;
28int yyerror(const char *msg);
29
30extern void yy_scan_string(const char *);
31extern int yyparse(void);
32
33int
34yyerror(const char *msg)
35{
36	fprintf(stderr, "m4: %s in expr %s\n", msg, copy_toeval);
37	return(0);
38}
39
40int
41expr(const char *toeval)
42{
43	copy_toeval = toeval;
44	yy_scan_string(toeval);
45	yyparse();
46	return end_result;
47}
48