1 /* hard-locale.c -- Determine whether a locale is hard. 2 3 Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2018 Free Software 4 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 <https://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 #elif defined __UCLIBC__ 30 # define GLIBC_VERSION 2 31 #else 32 # define GLIBC_VERSION 0 33 #endif 34 35 /* Return true if the current CATEGORY locale is hard, i.e. if you 36 can't get away with assuming traditional C or POSIX behavior. */ 37 bool 38 hard_locale (int category) 39 { 40 bool hard = true; 41 char const *p = setlocale (category, NULL); 42 43 if (p) 44 { 45 if (2 <= GLIBC_VERSION) 46 { 47 if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0) 48 hard = false; 49 } 50 else 51 { 52 char *locale = strdup (p); 53 if (locale) 54 { 55 /* Temporarily set the locale to the "C" and "POSIX" locales 56 to find their names, so that we can determine whether one 57 or the other is the caller's locale. */ 58 if (((p = setlocale (category, "C")) 59 && strcmp (p, locale) == 0) 60 || ((p = setlocale (category, "POSIX")) 61 && strcmp (p, locale) == 0)) 62 hard = false; 63 64 /* Restore the caller's locale. */ 65 setlocale (category, locale); 66 free (locale); 67 } 68 } 69 } 70 71 return hard; 72 } 73