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 #include <stdint.h>
19 #include <stdio.h>
20 #include <stddef.h>
21 #include "mdef.h"
22 #include "extern.h"
23
24 int32_t end_result;
25 static const char *copy_toeval;
26 int yyerror(const char *msg);
27
28 extern void yy_scan_string(const char *);
29 extern int yyparse(void);
30
31 int
yyerror(const char * msg)32 yyerror(const char *msg)
33 {
34 fprintf(stderr, "m4: %s in expr %s\n", msg, copy_toeval);
35 return(0);
36 }
37
38 int
expr(const char * toeval)39 expr(const char *toeval)
40 {
41 copy_toeval = toeval;
42 yy_scan_string(toeval);
43 yyparse();
44 return end_result;
45 }
46