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regex.c revision 1.11 
      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 
     37 /*
     38  * Compatibility routines that implement the old re_comp/re_exec interface in
     39  * terms of the regcomp/regexec interface.  It's possible that some programs
     40  * rely on dark corners of re_comp/re_exec and won't work with this version,
     41  * but most programs should be fine.
     42  */
     43 
     44 #include <sys/cdefs.h>
     45 #if defined(LIBC_SCCS) && !defined(lint)
     46 #if 0
     47 static char sccsid[] = "from: @(#)regex.c	5.1 (Berkeley) 3/29/92";*/
     48 #else
     49 __RCSID("$NetBSD: regex.c,v 1.11 1999/09/20 04:48:03 lukem Exp $");
     50 #endif
     51 #endif /* LIBC_SCCS and not lint */
     52 
     53 #include <sys/types.h>
     54 #include <stddef.h>
     55 #ifdef __lint__
     56 #define __compat_regerror __compat43_regerror
     57 #endif
     58 #include <assert.h>
     59 #include <regexp.h>
     60 #include <re_comp.h>
     61 #include <string.h>
     62 #include <stdlib.h>
     63 #include <unistd.h>
     64 
     65 static regexp *re_regexp;
     66 static int re_goterr;
     67 static char *re_errstr;
     68 
     69 char *
     70 re_comp(s)
     71 	const char *s;
     72 {
     73 	if (s == NULL || *s == '\0')
     74 		return (NULL);
     75 	if (re_regexp)
     76 		free(re_regexp);
     77 	if (re_errstr)
     78 		free(re_errstr);
     79 	re_goterr = 0;
     80 	re_regexp = regcomp(s);
     81 	return (re_goterr ? re_errstr : NULL);
     82 }
     83 
     84 int
     85 re_exec(s)
     86 	const char *s;
     87 {
     88 	int rc;
     89 
     90 
     91 	re_goterr = 0;
     92 	rc = regexec(re_regexp, s);
     93 	return (re_goterr ? -1 : rc);
     94 }
     95 
     96 void
     97 regerror(s)
     98 	const char *s;
     99 {
    100 
    101 	_DIAGASSERT(s != NULL);
    102 
    103 	re_goterr = 1;
    104 	if (re_errstr)
    105 		free(re_errstr);
    106 	re_errstr = strdup(s);
    107 }
    108