usr.bin/m4/expr.c

   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  * $FreeBSD: src/usr.bin/m4/expr.c,v 1.19 2012/11/17 01:54:24 svnexp Exp $
  18  */
  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 }