1 /* hard-locale.c -- Determine whether a locale is hard. 2 3 Copyright (C) 1997, 1998, 1999, 2002, 2003, 2004, 2006, 2007, 2009, 2010 4 Free Software Foundation, Inc. 5 6 This program is free software: you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 #include <config.h> 20 21 #include "hard-locale.h" 22 23 #include <locale.h> 24 #include <stdlib.h> 25 #include <string.h> 26 27 #ifdef __GLIBC__ 28 # define GLIBC_VERSION __GLIBC__ 29 #else 30 # define GLIBC_VERSION 0 31 #endif 32 33 /* Return true if the current CATEGORY locale is hard, i.e. if you 34 can't get away with assuming traditional C or POSIX behavior. */ 35 bool 36 hard_locale (int category) 37 { 38 bool hard = true; 39 char const *p = setlocale (category, NULL); 40 41 if (p) 42 { 43 if (2 <= GLIBC_VERSION) 44 { 45 if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0) 46 hard = false; 47 } 48 else 49 { 50 char *locale = strdup (p); 51 if (locale) 52 { 53 /* Temporarily set the locale to the "C" and "POSIX" locales 54 to find their names, so that we can determine whether one 55 or the other is the caller's locale. */ 56 if (((p = setlocale (category, "C")) 57 && strcmp (p, locale) == 0) 58 || ((p = setlocale (category, "POSIX")) 59 && strcmp (p, locale) == 0)) 60 hard = false; 61 62 /* Restore the caller's locale. */ 63 setlocale (category, locale); 64 free (locale); 65 } 66 } 67 } 68 69 return hard; 70 } 71