| 1 | /* Query the name of the current global locale.
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| 2 | Copyright (C) 2019-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <bruno@clisp.org>, 2019. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | /* Specification. */
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| 22 | #include "setlocale_null.h"
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| 23 |
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| 24 | #include <errno.h>
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| 25 | #include <locale.h>
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| 26 | #include <stdlib.h>
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| 27 | #include <string.h>
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| 28 | #if defined _WIN32 && !defined __CYGWIN__
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| 29 | # include <wchar.h>
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| 30 | #endif
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| 31 |
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| 32 | #if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE)
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| 33 | # if defined _WIN32 && !defined __CYGWIN__
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| 34 |
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| 35 | # define WIN32_LEAN_AND_MEAN /* avoid including junk */
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| 36 | # include <windows.h>
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| 37 |
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| 38 | # elif HAVE_PTHREAD_API
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| 39 |
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| 40 | # include <pthread.h>
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| 41 | # if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
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| 42 | # include <threads.h>
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| 43 | # pragma weak thrd_exit
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| 44 | # define c11_threads_in_use() (thrd_exit != NULL)
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| 45 | # else
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| 46 | # define c11_threads_in_use() 0
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| 47 | # endif
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| 48 |
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| 49 | # elif HAVE_THREADS_H
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| 50 |
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| 51 | # include <threads.h>
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| 52 |
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| 53 | # endif
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| 54 | #endif
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| 55 |
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| 56 | /* Use the system's setlocale() function, not the gnulib override, here. */
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| 57 | #undef setlocale
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| 58 |
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| 59 | static const char *
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| 60 | setlocale_null_androidfix (int category)
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| 61 | {
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| 62 | const char *result = setlocale (category, NULL);
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| 63 |
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| 64 | #ifdef __ANDROID__
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| 65 | if (result == NULL)
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| 66 | switch (category)
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| 67 | {
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| 68 | case LC_CTYPE:
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| 69 | case LC_NUMERIC:
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| 70 | case LC_TIME:
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| 71 | case LC_COLLATE:
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| 72 | case LC_MONETARY:
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| 73 | case LC_MESSAGES:
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| 74 | case LC_ALL:
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| 75 | case LC_PAPER:
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| 76 | case LC_NAME:
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| 77 | case LC_ADDRESS:
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| 78 | case LC_TELEPHONE:
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| 79 | case LC_MEASUREMENT:
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| 80 | result = "C";
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| 81 | break;
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| 82 | default:
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| 83 | break;
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| 84 | }
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| 85 | #endif
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| 86 |
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| 87 | return result;
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| 88 | }
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| 89 |
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| 90 | static int
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| 91 | setlocale_null_unlocked (int category, char *buf, size_t bufsize)
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| 92 | {
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| 93 | #if defined _WIN32 && !defined __CYGWIN__ && defined _MSC_VER
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| 94 | /* On native Windows, nowadays, the setlocale() implementation is based
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| 95 | on _wsetlocale() and uses malloc() for the result. We are better off
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| 96 | using _wsetlocale() directly. */
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| 97 | const wchar_t *result = _wsetlocale (category, NULL);
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| 98 |
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| 99 | if (result == NULL)
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| 100 | {
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| 101 | /* CATEGORY is invalid. */
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| 102 | if (bufsize > 0)
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| 103 | /* Return an empty string in BUF.
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| 104 | This is a convenience for callers that don't want to write explicit
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| 105 | code for handling EINVAL. */
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| 106 | buf[0] = '\0';
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| 107 | return EINVAL;
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| 108 | }
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| 109 | else
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| 110 | {
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| 111 | size_t length = wcslen (result);
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| 112 | if (length < bufsize)
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| 113 | {
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| 114 | size_t i;
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| 115 |
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| 116 | /* Convert wchar_t[] -> char[], assuming plain ASCII. */
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| 117 | for (i = 0; i <= length; i++)
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| 118 | buf[i] = result[i];
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| 119 |
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| 120 | return 0;
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| 121 | }
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| 122 | else
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| 123 | {
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| 124 | if (bufsize > 0)
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| 125 | {
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| 126 | /* Return a truncated result in BUF.
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| 127 | This is a convenience for callers that don't want to write
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| 128 | explicit code for handling ERANGE. */
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| 129 | size_t i;
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| 130 |
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| 131 | /* Convert wchar_t[] -> char[], assuming plain ASCII. */
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| 132 | for (i = 0; i < bufsize; i++)
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| 133 | buf[i] = result[i];
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| 134 | buf[bufsize - 1] = '\0';
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| 135 | }
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| 136 | return ERANGE;
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| 137 | }
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| 138 | }
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| 139 | #else
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| 140 | const char *result = setlocale_null_androidfix (category);
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| 141 |
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| 142 | if (result == NULL)
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| 143 | {
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| 144 | /* CATEGORY is invalid. */
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| 145 | if (bufsize > 0)
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| 146 | /* Return an empty string in BUF.
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| 147 | This is a convenience for callers that don't want to write explicit
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| 148 | code for handling EINVAL. */
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| 149 | buf[0] = '\0';
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| 150 | return EINVAL;
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| 151 | }
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| 152 | else
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| 153 | {
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| 154 | size_t length = strlen (result);
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| 155 | if (length < bufsize)
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| 156 | {
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| 157 | memcpy (buf, result, length + 1);
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| 158 | return 0;
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| 159 | }
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| 160 | else
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| 161 | {
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| 162 | if (bufsize > 0)
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| 163 | {
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| 164 | /* Return a truncated result in BUF.
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| 165 | This is a convenience for callers that don't want to write
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| 166 | explicit code for handling ERANGE. */
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| 167 | memcpy (buf, result, bufsize - 1);
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| 168 | buf[bufsize - 1] = '\0';
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| 169 | }
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| 170 | return ERANGE;
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| 171 | }
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| 172 | }
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| 173 | #endif
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| 174 | }
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| 175 |
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| 176 | #if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE) /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin */
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| 177 |
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| 178 | /* Use a lock, so that no two threads can invoke setlocale_null_unlocked
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| 179 | at the same time. */
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| 180 |
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| 181 | /* Prohibit renaming this symbol. */
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| 182 | # undef gl_get_setlocale_null_lock
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| 183 |
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| 184 | # if defined _WIN32 && !defined __CYGWIN__
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| 185 |
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| 186 | extern __declspec(dllimport) CRITICAL_SECTION *gl_get_setlocale_null_lock (void);
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| 187 |
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| 188 | static int
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| 189 | setlocale_null_with_lock (int category, char *buf, size_t bufsize)
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| 190 | {
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| 191 | CRITICAL_SECTION *lock = gl_get_setlocale_null_lock ();
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| 192 | int ret;
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| 193 |
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| 194 | EnterCriticalSection (lock);
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| 195 | ret = setlocale_null_unlocked (category, buf, bufsize);
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| 196 | LeaveCriticalSection (lock);
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| 197 |
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| 198 | return ret;
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| 199 | }
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| 200 |
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| 201 | # elif HAVE_PTHREAD_API /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin */
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| 202 |
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| 203 | extern
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| 204 | # if defined _WIN32 || defined __CYGWIN__
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| 205 | __declspec(dllimport)
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| 206 | # endif
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| 207 | pthread_mutex_t *gl_get_setlocale_null_lock (void);
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| 208 |
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| 209 | # if HAVE_WEAK_SYMBOLS /* musl libc, FreeBSD, NetBSD, OpenBSD, Haiku */
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| 210 |
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| 211 | /* Avoid the need to link with '-lpthread'. */
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| 212 | # pragma weak pthread_mutex_lock
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| 213 | # pragma weak pthread_mutex_unlock
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| 214 |
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| 215 | /* Determine whether libpthread is in use. */
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| 216 | # pragma weak pthread_mutexattr_gettype
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| 217 | /* See the comments in lock.h. */
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| 218 | # define pthread_in_use() \
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| 219 | (pthread_mutexattr_gettype != NULL || c11_threads_in_use ())
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| 220 |
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| 221 | # else
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| 222 | # define pthread_in_use() 1
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| 223 | # endif
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| 224 |
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| 225 | static int
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| 226 | setlocale_null_with_lock (int category, char *buf, size_t bufsize)
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| 227 | {
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| 228 | if (pthread_in_use())
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| 229 | {
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| 230 | pthread_mutex_t *lock = gl_get_setlocale_null_lock ();
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| 231 | int ret;
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| 232 |
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| 233 | if (pthread_mutex_lock (lock))
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| 234 | abort ();
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| 235 | ret = setlocale_null_unlocked (category, buf, bufsize);
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| 236 | if (pthread_mutex_unlock (lock))
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| 237 | abort ();
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| 238 |
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| 239 | return ret;
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| 240 | }
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| 241 | else
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| 242 | return setlocale_null_unlocked (category, buf, bufsize);
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| 243 | }
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| 244 |
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| 245 | # elif HAVE_THREADS_H
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| 246 |
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| 247 | extern mtx_t *gl_get_setlocale_null_lock (void);
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| 248 |
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| 249 | static int
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| 250 | setlocale_null_with_lock (int category, char *buf, size_t bufsize)
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| 251 | {
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| 252 | mtx_t *lock = gl_get_setlocale_null_lock ();
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| 253 | int ret;
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| 254 |
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| 255 | if (mtx_lock (lock) != thrd_success)
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| 256 | abort ();
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| 257 | ret = setlocale_null_unlocked (category, buf, bufsize);
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| 258 | if (mtx_unlock (lock) != thrd_success)
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| 259 | abort ();
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| 260 |
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| 261 | return ret;
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| 262 | }
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| 263 |
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| 264 | # endif
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| 265 |
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| 266 | #endif
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| 267 |
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| 268 | int
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| 269 | setlocale_null_r (int category, char *buf, size_t bufsize)
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| 270 | {
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| 271 | #if SETLOCALE_NULL_ALL_MTSAFE
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| 272 | # if SETLOCALE_NULL_ONE_MTSAFE
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| 273 |
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| 274 | return setlocale_null_unlocked (category, buf, bufsize);
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| 275 |
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| 276 | # else
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| 277 |
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| 278 | if (category == LC_ALL)
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| 279 | return setlocale_null_unlocked (category, buf, bufsize);
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| 280 | else
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| 281 | return setlocale_null_with_lock (category, buf, bufsize);
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| 282 |
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| 283 | # endif
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| 284 | #else
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| 285 | # if SETLOCALE_NULL_ONE_MTSAFE
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| 286 |
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| 287 | if (category == LC_ALL)
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| 288 | return setlocale_null_with_lock (category, buf, bufsize);
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| 289 | else
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| 290 | return setlocale_null_unlocked (category, buf, bufsize);
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| 291 |
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| 292 | # else
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| 293 |
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| 294 | return setlocale_null_with_lock (category, buf, bufsize);
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| 295 |
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| 296 | # endif
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| 297 | #endif
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| 298 | }
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| 299 |
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| 300 | const char *
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| 301 | setlocale_null (int category)
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| 302 | {
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| 303 | #if SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE
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| 304 | return setlocale_null_androidfix (category);
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| 305 | #else
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| 306 |
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| 307 | /* This call must be multithread-safe. To achieve this without using
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| 308 | thread-local storage:
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| 309 | 1. We use a specific static buffer for each possible CATEGORY
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| 310 | argument. So that different threads can call setlocale_mtsafe
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| 311 | with different CATEGORY arguments, without interfering.
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| 312 | 2. We use a simple strcpy or memcpy to fill this static buffer.
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| 313 | Filling it through, for example, strcpy + strcat would not be
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| 314 | guaranteed to leave the buffer's contents intact if another thread
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| 315 | is currently accessing it. If necessary, the contents is first
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| 316 | assembled in a stack-allocated buffer. */
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| 317 | if (category == LC_ALL)
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| 318 | {
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| 319 | # if SETLOCALE_NULL_ALL_MTSAFE
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| 320 | return setlocale_null_androidfix (LC_ALL);
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| 321 | # else
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| 322 | char buf[SETLOCALE_NULL_ALL_MAX];
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| 323 | static char resultbuf[SETLOCALE_NULL_ALL_MAX];
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| 324 |
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| 325 | if (setlocale_null_r (LC_ALL, buf, sizeof (buf)))
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| 326 | return "C";
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| 327 | strcpy (resultbuf, buf);
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| 328 | return resultbuf;
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| 329 | # endif
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| 330 | }
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| 331 | else
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| 332 | {
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| 333 | # if SETLOCALE_NULL_ONE_MTSAFE
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| 334 | return setlocale_null_androidfix (category);
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| 335 | # else
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| 336 | enum
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| 337 | {
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| 338 | LC_CTYPE_INDEX,
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| 339 | LC_NUMERIC_INDEX,
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| 340 | LC_TIME_INDEX,
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| 341 | LC_COLLATE_INDEX,
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| 342 | LC_MONETARY_INDEX,
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| 343 | LC_MESSAGES_INDEX,
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| 344 | # ifdef LC_PAPER
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| 345 | LC_PAPER_INDEX,
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| 346 | # endif
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| 347 | # ifdef LC_NAME
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| 348 | LC_NAME_INDEX,
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| 349 | # endif
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| 350 | # ifdef LC_ADDRESS
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| 351 | LC_ADDRESS_INDEX,
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| 352 | # endif
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| 353 | # ifdef LC_TELEPHONE
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| 354 | LC_TELEPHONE_INDEX,
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| 355 | # endif
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| 356 | # ifdef LC_MEASUREMENT
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| 357 | LC_MEASUREMENT_INDEX,
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| 358 | # endif
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| 359 | # ifdef LC_IDENTIFICATION
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| 360 | LC_IDENTIFICATION_INDEX,
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| 361 | # endif
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| 362 | LC_INDICES_COUNT
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| 363 | }
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| 364 | i;
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| 365 | char buf[SETLOCALE_NULL_MAX];
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| 366 | static char resultbuf[LC_INDICES_COUNT][SETLOCALE_NULL_MAX];
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| 367 | int err;
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| 368 |
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| 369 | err = setlocale_null_r (category, buf, sizeof (buf));
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| 370 | if (err == EINVAL)
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| 371 | return NULL;
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| 372 | if (err)
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| 373 | return "C";
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| 374 |
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| 375 | switch (category)
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| 376 | {
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| 377 | case LC_CTYPE: i = LC_CTYPE_INDEX; break;
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| 378 | case LC_NUMERIC: i = LC_NUMERIC_INDEX; break;
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| 379 | case LC_TIME: i = LC_TIME_INDEX; break;
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| 380 | case LC_COLLATE: i = LC_COLLATE_INDEX; break;
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| 381 | case LC_MONETARY: i = LC_MONETARY_INDEX; break;
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| 382 | case LC_MESSAGES: i = LC_MESSAGES_INDEX; break;
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| 383 | # ifdef LC_PAPER
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| 384 | case LC_PAPER: i = LC_PAPER_INDEX; break;
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| 385 | # endif
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| 386 | # ifdef LC_NAME
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| 387 | case LC_NAME: i = LC_NAME_INDEX; break;
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| 388 | # endif
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| 389 | # ifdef LC_ADDRESS
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| 390 | case LC_ADDRESS: i = LC_ADDRESS_INDEX; break;
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| 391 | # endif
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| 392 | # ifdef LC_TELEPHONE
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| 393 | case LC_TELEPHONE: i = LC_TELEPHONE_INDEX; break;
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| 394 | # endif
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| 395 | # ifdef LC_MEASUREMENT
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| 396 | case LC_MEASUREMENT: i = LC_MEASUREMENT_INDEX; break;
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| 397 | # endif
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| 398 | # ifdef LC_IDENTIFICATION
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| 399 | case LC_IDENTIFICATION: i = LC_IDENTIFICATION_INDEX; break;
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| 400 | # endif
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| 401 | default:
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| 402 | /* If you get here, a #ifdef LC_xxx is missing. */
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| 403 | abort ();
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| 404 | }
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| 405 |
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| 406 | strcpy (resultbuf[i], buf);
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| 407 | return resultbuf[i];
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| 408 | # endif
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| 409 | }
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| 410 | #endif
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| 411 | }
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