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 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 39 expr(const char *toeval) 40 { 41 copy_toeval = toeval; 42 yy_scan_string(toeval); 43 yyparse(); 44 return end_result; 45 } 46