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 26 int32_t end_result; 27 static const char *copy_toeval; 28 int yyerror(const char *msg); 29 30 extern void yy_scan_string(const char *); 31 extern int yyparse(void); 32 33 int 34 yyerror(const char *msg) 35 { 36 fprintf(stderr, "m4: %s in expr %s\n", msg, copy_toeval); 37 return(0); 38 } 39 40 int 41 expr(const char *toeval) 42 { 43 copy_toeval = toeval; 44 yy_scan_string(toeval); 45 yyparse(); 46 return end_result; 47 } 48