NetBSD/lib/libcompat/regex.c

94 lines
3.0 KiB
C

/*-
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* James da Silva at the University of Maryland at College Park.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Compatibility routines that implement the old re_comp/re_exec interface in
* terms of the regcomp/regexec interface. It's possible that some programs
* rely on dark corners of re_comp/re_exec and won't work with this version,
* but most programs should be fine.
*/
#if defined(LIBC_SCCS) && !defined(lint)
/*static char sccsid[] = "from: @(#)regex.c 5.1 (Berkeley) 3/29/92";*/
static char rcsid[] = "$Id: regex.c,v 1.3 1993/11/11 01:24:50 jtc Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
static int compiled_regexp = 0;
static char errbuf[256];
static regex_t rp;
char *
re_comp(s)
char *s;
{
int eval;
if (s == NULL)
return (NULL);
if (compiled_regexp) {
regfree(&rp);
compiled_regexp = 0;
}
if ((eval = regcomp(&rp, s, REG_NOSUB)) != 0) {
regerror (eval, &rp, errbuf, sizeof(errbuf));
return errbuf;
}
compiled_regexp = 1;
return NULL;
}
int
re_exec(s)
char *s;
{
regmatch_t rm[1];
int eval;
if ((eval = regexec(&rp, s, 0, rm, 0)) == 0)
return 1;
return eval == REG_NOMATCH ? 0 : -1;
}