lib/libcompat/4.3/regex.c

   1 /*-
   2  * Copyright (c) 1992 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * James da Silva at the University of Maryland at College Park.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)regex.c  5.1 (Berkeley) 3/29/92
  37  */
  38
  39 /*
  40  * Compatibility routines that implement the old re_comp/re_exec interface in
  41  * terms of the regcomp/regexec interface.  It's possible that some programs
  42  * rely on dark corners of re_comp/re_exec and won't work with this version,
  43  * but most programs should be fine.
  44  */
  45
  46 #include <sys/types.h>
  47 #include <stddef.h>
  48 #include <regexp.h>
  49 #include <string.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 static regexp *re_regexp;
  54 static int re_goterr;
  55 static char *re_errstr;
  56
  57 char *
  58 re_comp(s)
  59         char *s;
  60 {
  61         if (s == NULL || *s == '\0') {
  62                 if (re_regexp == NULL)
  63                         return "no previous regular expression";
  64                 return (NULL);
  65         }
  66         if (re_regexp)
  67                 free(re_regexp);
  68         if (re_errstr)
  69                 free(re_errstr);
  70         re_goterr = 0;
  71         re_regexp = regcomp(s);
  72         return (re_goterr ? re_errstr : NULL);
  73 }
  74
  75 int
  76 re_exec(s)
  77         char *s;
  78 {
  79         int rc;
  80
  81         re_goterr = 0;
  82         rc = regexec(re_regexp, s);
  83         return (re_goterr ? -1 : rc);
  84 }
  85
  86 void
  87 regerror(s)
  88         const char *s;
  89 {
  90         re_goterr = 1;
  91         if (re_errstr)
  92                 free(re_errstr);
  93         re_errstr = strdup(s);
  94 }