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 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 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 #if defined(LIBC_SCCS) && !defined(lint) 44 static char sccsid[] = "@(#)regex.c 5.1 (Berkeley) 3/29/92"; 45 #endif /* LIBC_SCCS and not lint */ 46 47 #include <regex.h> 48 #include <stddef.h> 49 #include <unistd.h> 50 51 static regex_t re_regexp; 52 static int re_gotexp; 53 static char re_errstr[100]; 54 55 char * 56 re_comp(const char *s) 57 { 58 int rc; 59 60 if (s == NULL || *s == '\0') { 61 if (!re_gotexp) 62 return __DECONST(char *, 63 "no previous regular expression"); 64 return (NULL); 65 } 66 67 if (re_gotexp) { 68 regfree(&re_regexp); 69 re_gotexp = 0; 70 } 71 72 rc = regcomp(&re_regexp, s, REG_EXTENDED); 73 if (rc == 0) { 74 re_gotexp = 1; 75 return (NULL); 76 } 77 78 regerror(rc, &re_regexp, re_errstr, sizeof(re_errstr)); 79 re_errstr[sizeof(re_errstr) - 1] = '\0'; 80 return (re_errstr); 81 } 82 83 int 84 re_exec(const char *s) 85 { 86 int rc; 87 88 if (!re_gotexp) 89 return (-1); 90 rc = regexec(&re_regexp, s, 0, NULL, 0); 91 return (rc == 0 ? 1 : 0); 92 } 93