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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Compatibility routines that implement the old re_comp/re_exec interface in
  35  * terms of the regcomp/regexec interface.  It's possible that some programs
  36  * rely on dark corners of re_comp/re_exec and won't work with this version,
  37  * but most programs should be fine.
  38  */
  39
  40 #include <sys/cdefs.h>
  41 #if defined(LIBC_SCCS) && !defined(lint)
  42 #if 0
  43 static char sccsid[] = "from: @(#)regex.c       5.1 (Berkeley) 3/29/92";*/
  44 #else
  45 __RCSID("$NetBSD: regex.c,v 1.11 1999/09/20 04:48:03 lukem Exp $");
  46 #endif
  47 #endif /* LIBC_SCCS and not lint */
  48
  49 #include <sys/types.h>
  50 #include <stddef.h>
  51 #ifdef __lint__
  52 #define __compat_regerror __compat43_regerror
  53 #endif
  54 #include <assert.h>
  55 #include <regexp.h>
  56 #include <re_comp.h>
  57 #include <string.h>
  58 #include <stdlib.h>
  59 #include <unistd.h>
  60
  61 static regexp *re_regexp;
  62 static int re_goterr;
  63 static char *re_errstr;
  64
  65 char *
  66 re_comp(s)
  67         const char *s;
  68 {
  69         if (s == NULL || *s == '\0')
  70                 return (NULL);
  71         if (re_regexp)
  72                 free(re_regexp);
  73         if (re_errstr)
  74                 free(re_errstr);
  75         re_goterr = 0;
  76         re_regexp = regcomp(s);
  77         return (re_goterr ? re_errstr : NULL);
  78 }
  79
  80 int
  81 re_exec(s)
  82         const char *s;
  83 {
  84         int rc;
  85
  86
  87         re_goterr = 0;
  88         rc = regexec(re_regexp, s);
  89         return (re_goterr ? -1 : rc);
  90 }
  91
  92 void
  93 regerror(s)
  94         const char *s;
  95 {
  96
  97         _DIAGASSERT(s != NULL);
  98
  99         re_goterr = 1;
 100         if (re_errstr)
 101                 free(re_errstr);
 102         re_errstr = strdup(s);
 103 }