Home | History | Annotate | Line # | Download | only in m4
expr.c revision 1.1.1.3 
      1 /* $OpenBSD: expr.c,v 1.17 2006/01/20 23:10:19 espie Exp $ */
      2 /*
      3  * Copyright (c) 2004 Marc Espie <espie (at) 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 <stdint.h>
     18 #include <stdio.h>
     19 #include <stddef.h>
     20 #include "mdef.h"
     21 #include "extern.h"
     22 
     23 int32_t end_result;
     24 const char *copy_toeval;
     25 
     26 extern void yy_scan_string(const char *);
     27 extern int yyparse(void);
     28 
     29 int
     30 yyerror(const char *msg)
     31 {
     32 	fprintf(stderr, "m4: %s in expr %s\n", msg, copy_toeval);
     33 	return(0);
     34 }
     35 
     36 int
     37 expr(const char *toeval)
     38 {
     39 	copy_toeval = toeval;
     40 	yy_scan_string(toeval);
     41 	yyparse();
     42 	return end_result;
     43 }
     44