1 /* Determine whether string value is affirmation or negative response 2 according to current locale's data. 3 Copyright (C) 1996, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 18 #include <sys/cdefs.h> 19 __RCSID("$NetBSD: rpmatch.c,v 1.2 2016/05/17 14:00:09 christos Exp $"); 20 21 22 #ifdef HAVE_CONFIG_H 23 # include <config.h> 24 #endif 25 26 #include <stddef.h> 27 #include <stdlib.h> 28 29 #if ENABLE_NLS 30 # include <sys/types.h> 31 # include <limits.h> 32 # include <regex.h> 33 # include "gettext.h" 34 # define _(msgid) gettext (msgid) 35 36 static int 37 try (const char *response, const char *pattern, const int match, 38 const int nomatch, const char **lastp, regex_t *re) 39 { 40 if (pattern != *lastp) 41 { 42 /* The pattern has changed. */ 43 if (*lastp) 44 { 45 /* Free the old compiled pattern. */ 46 regfree (re); 47 *lastp = NULL; 48 } 49 /* Compile the pattern and cache it for future runs. */ 50 if (regcomp (re, pattern, REG_EXTENDED) != 0) 51 return -1; 52 *lastp = pattern; 53 } 54 55 /* See if the regular expression matches RESPONSE. */ 56 return regexec (re, response, 0, NULL, 0) == 0 ? match : nomatch; 57 } 58 #endif 59 60 61 int 62 rpmatch (const char *response) 63 { 64 #if ENABLE_NLS 65 /* Match against one of the response patterns, compiling the pattern 66 first if necessary. */ 67 68 /* We cache the response patterns and compiled regexps here. */ 69 static const char *yesexpr, *noexpr; 70 static regex_t yesre, nore; 71 int result; 72 73 return ((result = try (response, _("^[yY]"), 1, 0, 74 &yesexpr, &yesre)) 75 ? result 76 : try (response, _("^[nN]"), 0, -1, &noexpr, &nore)); 77 #else 78 /* Test against "^[yY]" and "^[nN]", hardcoded to avoid requiring regex */ 79 return (*response == 'y' || *response == 'Y' ? 1 80 : *response == 'n' || *response == 'N' ? 0 : -1); 81 #endif 82 } 83