1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * James da Silva at the University of Maryland at College Park. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 /* 39 * Compatibility routines that implement the old re_comp/re_exec interface in 40 * terms of the regcomp/regexec interface. It's possible that some programs 41 * rely on dark corners of re_comp/re_exec and won't work with this version, 42 * but most programs should be fine. 43 */ 44 45 #if defined(LIBC_SCCS) && !defined(lint) 46 static char sccsid[] = "@(#)regex.c 5.1 (Berkeley) 3/29/92"; 47 #endif /* LIBC_SCCS and not lint */ 48 49 #include <regex.h> 50 #include <stddef.h> 51 #include <unistd.h> 52 53 static regex_t re_regexp; 54 static int re_gotexp; 55 static char re_errstr[100]; 56 57 char * 58 re_comp(const char *s) 59 { 60 int rc; 61 62 if (s == NULL || *s == '\0') { 63 if (!re_gotexp) 64 return __DECONST(char *, 65 "no previous regular expression"); 66 return (NULL); 67 } 68 69 if (re_gotexp) { 70 regfree(&re_regexp); 71 re_gotexp = 0; 72 } 73 74 rc = regcomp(&re_regexp, s, REG_EXTENDED); 75 if (rc == 0) { 76 re_gotexp = 1; 77 return (NULL); 78 } 79 80 regerror(rc, &re_regexp, re_errstr, sizeof(re_errstr)); 81 re_errstr[sizeof(re_errstr) - 1] = '\0'; 82 return (re_errstr); 83 } 84 85 int 86 re_exec(const char *s) 87 { 88 int rc; 89 90 if (!re_gotexp) 91 return (-1); 92 rc = regexec(&re_regexp, s, 0, NULL, 0); 93 return (rc == 0 ? 1 : 0); 94 } 95