expr.c revision 296373 
1284345Ssjg/* $OpenBSD: expr.c,v 1.18 2010/09/07 19:58:09 marco Exp $ */
2284345Ssjg/*
3284345Ssjg * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
4284345Ssjg *
5284345Ssjg * Permission to use, copy, modify, and distribute this software for any
6284345Ssjg * purpose with or without fee is hereby granted, provided that the above
7284345Ssjg * copyright notice and this permission notice appear in all copies.
8284345Ssjg *
9284345Ssjg * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10284345Ssjg * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11284345Ssjg * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12284345Ssjg * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13284345Ssjg * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14284345Ssjg * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15284345Ssjg * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16284345Ssjg */
17284345Ssjg#include <sys/cdefs.h>
18284345Ssjg__FBSDID("$FreeBSD: releng/10.3/usr.bin/m4/expr.c 241777 2012-10-20 10:33:15Z ed $");
19284345Ssjg
20284345Ssjg#include <stdint.h>
21284345Ssjg#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