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 * 4. 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 * @(#)regex.c 5.1 (Berkeley) 3/29/92 33 * $FreeBSD: head/lib/libcompat/4.3/re_comp.c 205146 2010-03-14 10:18:58Z ed $ 34 */ 35 36 /* 37 * Compatibility routines that implement the old re_comp/re_exec interface in 38 * terms of the regcomp/regexec interface. It's possible that some programs 39 * rely on dark corners of re_comp/re_exec and won't work with this version, 40 * but most programs should be fine. 41 */ 42 43 #include <regex.h> 44 #include <stddef.h> 45 #include <unistd.h> 46 47 static regex_t re_regexp; 48 static int re_gotexp; 49 static char re_errstr[100]; 50 51 char * 52 re_comp(const char *s) 53 { 54 int rc; 55 56 if (s == NULL || *s == '\0') { 57 if (!re_gotexp) 58 return __DECONST(char *, 59 "no previous regular expression"); 60 return (NULL); 61 } 62 63 if (re_gotexp) { 64 regfree(&re_regexp); 65 re_gotexp = 0; 66 } 67 68 rc = regcomp(&re_regexp, s, REG_EXTENDED); 69 if (rc == 0) { 70 re_gotexp = 1; 71 return (NULL); 72 } 73 74 regerror(rc, &re_regexp, re_errstr, sizeof(re_errstr)); 75 re_errstr[sizeof(re_errstr) - 1] = '\0'; 76 return (re_errstr); 77 } 78 79 int 80 re_exec(const char *s) 81 { 82 int rc; 83 84 if (!re_gotexp) 85 return (-1); 86 rc = regexec(&re_regexp, s, 0, NULL, 0); 87 return (rc == 0 ? 1 : 0); 88 } 89