| 1 | /* Determine a canonical name for the current locale's character encoding.
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| 2 |
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| 3 | Copyright (C) 2000-2006, 2008-2012 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License along
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| 16 | with this program; if not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Written by Bruno Haible <bruno@clisp.org>. */
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| 19 |
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| 20 | #include <config.h>
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| 21 |
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| 22 | /* Specification. */
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| 23 | #include "localcharset.h"
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| 24 |
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| 25 | #include <fcntl.h>
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| 26 | #include <stddef.h>
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| 27 | #include <stdio.h>
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| 28 | #include <string.h>
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| 29 | #include <stdlib.h>
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| 30 |
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| 31 | #if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET
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| 32 | # define DARWIN7 /* Darwin 7 or newer, i.e. MacOS X 10.3 or newer */
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| 33 | #endif
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| 34 |
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| 35 | #if defined _WIN32 || defined __WIN32__
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| 36 | # define WINDOWS_NATIVE
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| 37 | #endif
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| 38 |
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| 39 | #if defined __EMX__
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| 40 | /* Assume EMX program runs on OS/2, even if compiled under DOS. */
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| 41 | # ifndef OS2
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| 42 | # define OS2
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| 43 | # endif
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| 44 | #endif
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| 45 |
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| 46 | #if !defined WINDOWS_NATIVE
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| 47 | # include <unistd.h>
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| 48 | # if HAVE_LANGINFO_CODESET
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| 49 | # include <langinfo.h>
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| 50 | # else
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| 51 | # if 0 /* see comment below */
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| 52 | # include <locale.h>
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| 53 | # endif
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| 54 | # endif
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| 55 | # ifdef __CYGWIN__
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| 56 | # define WIN32_LEAN_AND_MEAN
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| 57 | # include <windows.h>
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| 58 | # endif
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| 59 | #elif defined WINDOWS_NATIVE
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| 60 | # define WIN32_LEAN_AND_MEAN
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| 61 | # include <windows.h>
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| 62 | #endif
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| 63 | #if defined OS2
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| 64 | # define INCL_DOS
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| 65 | # include <os2.h>
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| 66 | #endif
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| 67 |
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| 68 | #if ENABLE_RELOCATABLE
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| 69 | # include "relocatable.h"
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| 70 | #else
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| 71 | # define relocate(pathname) (pathname)
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| 72 | #endif
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| 73 |
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| 74 | /* Get LIBDIR. */
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| 75 | #ifndef LIBDIR
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| 76 | # include "configmake.h"
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| 77 | #endif
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| 78 |
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| 79 | /* Define O_NOFOLLOW to 0 on platforms where it does not exist. */
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| 80 | #ifndef O_NOFOLLOW
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| 81 | # define O_NOFOLLOW 0
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| 82 | #endif
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| 83 |
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| 84 | #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
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| 85 | /* Native Windows, Cygwin, OS/2, DOS */
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| 86 | # define ISSLASH(C) ((C) == '/' || (C) == '\\')
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| 87 | #endif
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| 88 |
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| 89 | #ifndef DIRECTORY_SEPARATOR
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| 90 | # define DIRECTORY_SEPARATOR '/'
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| 91 | #endif
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| 92 |
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| 93 | #ifndef ISSLASH
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| 94 | # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
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| 95 | #endif
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| 96 |
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| 97 | #if HAVE_DECL_GETC_UNLOCKED
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| 98 | # undef getc
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| 99 | # define getc getc_unlocked
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| 100 | #endif
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| 101 |
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| 102 | /* The following static variable is declared 'volatile' to avoid a
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| 103 | possible multithread problem in the function get_charset_aliases. If we
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| 104 | are running in a threaded environment, and if two threads initialize
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| 105 | 'charset_aliases' simultaneously, both will produce the same value,
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| 106 | and everything will be ok if the two assignments to 'charset_aliases'
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| 107 | are atomic. But I don't know what will happen if the two assignments mix. */
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| 108 | #if __STDC__ != 1
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| 109 | # define volatile /* empty */
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| 110 | #endif
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| 111 | /* Pointer to the contents of the charset.alias file, if it has already been
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| 112 | read, else NULL. Its format is:
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| 113 | ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */
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| 114 | static const char * volatile charset_aliases;
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| 115 |
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| 116 | /* Return a pointer to the contents of the charset.alias file. */
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| 117 | static const char *
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| 118 | get_charset_aliases (void)
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| 119 | {
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| 120 | const char *cp;
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| 121 |
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| 122 | cp = charset_aliases;
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| 123 | if (cp == NULL)
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| 124 | {
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| 125 | #if !(defined DARWIN7 || defined VMS || defined WINDOWS_NATIVE || defined __CYGWIN__)
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| 126 | const char *dir;
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| 127 | const char *base = "charset.alias";
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| 128 | char *file_name;
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| 129 |
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| 130 | /* Make it possible to override the charset.alias location. This is
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| 131 | necessary for running the testsuite before "make install". */
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| 132 | dir = getenv ("CHARSETALIASDIR");
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| 133 | if (dir == NULL || dir[0] == '\0')
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| 134 | dir = relocate (LIBDIR);
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| 135 |
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| 136 | /* Concatenate dir and base into freshly allocated file_name. */
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| 137 | {
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| 138 | size_t dir_len = strlen (dir);
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| 139 | size_t base_len = strlen (base);
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| 140 | int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1]));
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| 141 | file_name = (char *) malloc (dir_len + add_slash + base_len + 1);
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| 142 | if (file_name != NULL)
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| 143 | {
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| 144 | memcpy (file_name, dir, dir_len);
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| 145 | if (add_slash)
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| 146 | file_name[dir_len] = DIRECTORY_SEPARATOR;
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| 147 | memcpy (file_name + dir_len + add_slash, base, base_len + 1);
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | if (file_name == NULL)
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| 152 | /* Out of memory. Treat the file as empty. */
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| 153 | cp = "";
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| 154 | else
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| 155 | {
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| 156 | int fd;
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| 157 |
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| 158 | /* Open the file. Reject symbolic links on platforms that support
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| 159 | O_NOFOLLOW. This is a security feature. Without it, an attacker
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| 160 | could retrieve parts of the contents (namely, the tail of the
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| 161 | first line that starts with "* ") of an arbitrary file by placing
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| 162 | a symbolic link to that file under the name "charset.alias" in
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| 163 | some writable directory and defining the environment variable
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| 164 | CHARSETALIASDIR to point to that directory. */
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| 165 | fd = open (file_name,
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| 166 | O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0));
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| 167 | if (fd < 0)
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| 168 | /* File not found. Treat it as empty. */
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| 169 | cp = "";
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| 170 | else
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| 171 | {
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| 172 | FILE *fp;
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| 173 |
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| 174 | fp = fdopen (fd, "r");
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| 175 | if (fp == NULL)
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| 176 | {
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| 177 | /* Out of memory. Treat the file as empty. */
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| 178 | close (fd);
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| 179 | cp = "";
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| 180 | }
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| 181 | else
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| 182 | {
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| 183 | /* Parse the file's contents. */
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| 184 | char *res_ptr = NULL;
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| 185 | size_t res_size = 0;
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| 186 |
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| 187 | for (;;)
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| 188 | {
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| 189 | int c;
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| 190 | char buf1[50+1];
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| 191 | char buf2[50+1];
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| 192 | size_t l1, l2;
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| 193 | char *old_res_ptr;
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| 194 |
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| 195 | c = getc (fp);
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| 196 | if (c == EOF)
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| 197 | break;
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| 198 | if (c == '\n' || c == ' ' || c == '\t')
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| 199 | continue;
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| 200 | if (c == '#')
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| 201 | {
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| 202 | /* Skip comment, to end of line. */
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| 203 | do
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| 204 | c = getc (fp);
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| 205 | while (!(c == EOF || c == '\n'));
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| 206 | if (c == EOF)
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| 207 | break;
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| 208 | continue;
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| 209 | }
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| 210 | ungetc (c, fp);
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| 211 | if (fscanf (fp, "%50s %50s", buf1, buf2) < 2)
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| 212 | break;
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| 213 | l1 = strlen (buf1);
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| 214 | l2 = strlen (buf2);
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| 215 | old_res_ptr = res_ptr;
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| 216 | if (res_size == 0)
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| 217 | {
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| 218 | res_size = l1 + 1 + l2 + 1;
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| 219 | res_ptr = (char *) malloc (res_size + 1);
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| 220 | }
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| 221 | else
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| 222 | {
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| 223 | res_size += l1 + 1 + l2 + 1;
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| 224 | res_ptr = (char *) realloc (res_ptr, res_size + 1);
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| 225 | }
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| 226 | if (res_ptr == NULL)
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| 227 | {
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| 228 | /* Out of memory. */
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| 229 | res_size = 0;
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| 230 | free (old_res_ptr);
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| 231 | break;
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| 232 | }
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| 233 | strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
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| 234 | strcpy (res_ptr + res_size - (l2 + 1), buf2);
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| 235 | }
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| 236 | fclose (fp);
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| 237 | if (res_size == 0)
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| 238 | cp = "";
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| 239 | else
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| 240 | {
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| 241 | *(res_ptr + res_size) = '\0';
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| 242 | cp = res_ptr;
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| 243 | }
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| 244 | }
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| 245 | }
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| 246 |
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| 247 | free (file_name);
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| 248 | }
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| 249 |
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| 250 | #else
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| 251 |
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| 252 | # if defined DARWIN7
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| 253 | /* To avoid the trouble of installing a file that is shared by many
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| 254 | GNU packages -- many packaging systems have problems with this --,
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| 255 | simply inline the aliases here. */
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| 256 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
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| 257 | "ISO8859-2" "\0" "ISO-8859-2" "\0"
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| 258 | "ISO8859-4" "\0" "ISO-8859-4" "\0"
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| 259 | "ISO8859-5" "\0" "ISO-8859-5" "\0"
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| 260 | "ISO8859-7" "\0" "ISO-8859-7" "\0"
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| 261 | "ISO8859-9" "\0" "ISO-8859-9" "\0"
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| 262 | "ISO8859-13" "\0" "ISO-8859-13" "\0"
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| 263 | "ISO8859-15" "\0" "ISO-8859-15" "\0"
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| 264 | "KOI8-R" "\0" "KOI8-R" "\0"
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| 265 | "KOI8-U" "\0" "KOI8-U" "\0"
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| 266 | "CP866" "\0" "CP866" "\0"
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| 267 | "CP949" "\0" "CP949" "\0"
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| 268 | "CP1131" "\0" "CP1131" "\0"
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| 269 | "CP1251" "\0" "CP1251" "\0"
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| 270 | "eucCN" "\0" "GB2312" "\0"
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| 271 | "GB2312" "\0" "GB2312" "\0"
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| 272 | "eucJP" "\0" "EUC-JP" "\0"
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| 273 | "eucKR" "\0" "EUC-KR" "\0"
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| 274 | "Big5" "\0" "BIG5" "\0"
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| 275 | "Big5HKSCS" "\0" "BIG5-HKSCS" "\0"
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| 276 | "GBK" "\0" "GBK" "\0"
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| 277 | "GB18030" "\0" "GB18030" "\0"
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| 278 | "SJIS" "\0" "SHIFT_JIS" "\0"
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| 279 | "ARMSCII-8" "\0" "ARMSCII-8" "\0"
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| 280 | "PT154" "\0" "PT154" "\0"
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| 281 | /*"ISCII-DEV" "\0" "?" "\0"*/
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| 282 | "*" "\0" "UTF-8" "\0";
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| 283 | # endif
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| 284 |
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| 285 | # if defined VMS
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| 286 | /* To avoid the troubles of an extra file charset.alias_vms in the
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| 287 | sources of many GNU packages, simply inline the aliases here. */
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| 288 | /* The list of encodings is taken from the OpenVMS 7.3-1 documentation
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| 289 | "Compaq C Run-Time Library Reference Manual for OpenVMS systems"
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| 290 | section 10.7 "Handling Different Character Sets". */
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| 291 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
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| 292 | "ISO8859-2" "\0" "ISO-8859-2" "\0"
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| 293 | "ISO8859-5" "\0" "ISO-8859-5" "\0"
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| 294 | "ISO8859-7" "\0" "ISO-8859-7" "\0"
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| 295 | "ISO8859-8" "\0" "ISO-8859-8" "\0"
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| 296 | "ISO8859-9" "\0" "ISO-8859-9" "\0"
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| 297 | /* Japanese */
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| 298 | "eucJP" "\0" "EUC-JP" "\0"
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| 299 | "SJIS" "\0" "SHIFT_JIS" "\0"
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| 300 | "DECKANJI" "\0" "DEC-KANJI" "\0"
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| 301 | "SDECKANJI" "\0" "EUC-JP" "\0"
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| 302 | /* Chinese */
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| 303 | "eucTW" "\0" "EUC-TW" "\0"
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| 304 | "DECHANYU" "\0" "DEC-HANYU" "\0"
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| 305 | "DECHANZI" "\0" "GB2312" "\0"
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| 306 | /* Korean */
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| 307 | "DECKOREAN" "\0" "EUC-KR" "\0";
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| 308 | # endif
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| 309 |
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| 310 | # if defined WINDOWS_NATIVE || defined __CYGWIN__
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| 311 | /* To avoid the troubles of installing a separate file in the same
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| 312 | directory as the DLL and of retrieving the DLL's directory at
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| 313 | runtime, simply inline the aliases here. */
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| 314 |
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| 315 | cp = "CP936" "\0" "GBK" "\0"
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| 316 | "CP1361" "\0" "JOHAB" "\0"
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| 317 | "CP20127" "\0" "ASCII" "\0"
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| 318 | "CP20866" "\0" "KOI8-R" "\0"
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| 319 | "CP20936" "\0" "GB2312" "\0"
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| 320 | "CP21866" "\0" "KOI8-RU" "\0"
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| 321 | "CP28591" "\0" "ISO-8859-1" "\0"
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| 322 | "CP28592" "\0" "ISO-8859-2" "\0"
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| 323 | "CP28593" "\0" "ISO-8859-3" "\0"
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| 324 | "CP28594" "\0" "ISO-8859-4" "\0"
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| 325 | "CP28595" "\0" "ISO-8859-5" "\0"
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| 326 | "CP28596" "\0" "ISO-8859-6" "\0"
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| 327 | "CP28597" "\0" "ISO-8859-7" "\0"
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| 328 | "CP28598" "\0" "ISO-8859-8" "\0"
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| 329 | "CP28599" "\0" "ISO-8859-9" "\0"
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| 330 | "CP28605" "\0" "ISO-8859-15" "\0"
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| 331 | "CP38598" "\0" "ISO-8859-8" "\0"
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| 332 | "CP51932" "\0" "EUC-JP" "\0"
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| 333 | "CP51936" "\0" "GB2312" "\0"
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| 334 | "CP51949" "\0" "EUC-KR" "\0"
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| 335 | "CP51950" "\0" "EUC-TW" "\0"
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| 336 | "CP54936" "\0" "GB18030" "\0"
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| 337 | "CP65001" "\0" "UTF-8" "\0";
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| 338 | # endif
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| 339 | #endif
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| 340 |
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| 341 | charset_aliases = cp;
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| 342 | }
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| 343 |
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| 344 | return cp;
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| 345 | }
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| 346 |
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| 347 | /* Determine the current locale's character encoding, and canonicalize it
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| 348 | into one of the canonical names listed in config.charset.
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| 349 | The result must not be freed; it is statically allocated.
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| 350 | If the canonical name cannot be determined, the result is a non-canonical
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| 351 | name. */
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| 352 |
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| 353 | #ifdef STATIC
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| 354 | STATIC
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| 355 | #endif
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| 356 | const char *
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| 357 | locale_charset (void)
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| 358 | {
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| 359 | const char *codeset;
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| 360 | const char *aliases;
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| 361 |
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| 362 | #if !(defined WINDOWS_NATIVE || defined OS2)
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| 363 |
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| 364 | # if HAVE_LANGINFO_CODESET
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| 365 |
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| 366 | /* Most systems support nl_langinfo (CODESET) nowadays. */
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| 367 | codeset = nl_langinfo (CODESET);
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| 368 |
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| 369 | # ifdef __CYGWIN__
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| 370 | /* Cygwin < 1.7 does not have locales. nl_langinfo (CODESET) always
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| 371 | returns "US-ASCII". Return the suffix of the locale name from the
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| 372 | environment variables (if present) or the codepage as a number. */
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| 373 | if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0)
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| 374 | {
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| 375 | const char *locale;
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| 376 | static char buf[2 + 10 + 1];
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| 377 |
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| 378 | locale = getenv ("LC_ALL");
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| 379 | if (locale == NULL || locale[0] == '\0')
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| 380 | {
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| 381 | locale = getenv ("LC_CTYPE");
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| 382 | if (locale == NULL || locale[0] == '\0')
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| 383 | locale = getenv ("LANG");
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| 384 | }
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| 385 | if (locale != NULL && locale[0] != '\0')
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| 386 | {
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| 387 | /* If the locale name contains an encoding after the dot, return
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| 388 | it. */
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| 389 | const char *dot = strchr (locale, '.');
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| 390 |
|
|---|
| 391 | if (dot != NULL)
|
|---|
| 392 | {
|
|---|
| 393 | const char *modifier;
|
|---|
| 394 |
|
|---|
| 395 | dot++;
|
|---|
| 396 | /* Look for the possible @... trailer and remove it, if any. */
|
|---|
| 397 | modifier = strchr (dot, '@');
|
|---|
| 398 | if (modifier == NULL)
|
|---|
| 399 | return dot;
|
|---|
| 400 | if (modifier - dot < sizeof (buf))
|
|---|
| 401 | {
|
|---|
| 402 | memcpy (buf, dot, modifier - dot);
|
|---|
| 403 | buf [modifier - dot] = '\0';
|
|---|
| 404 | return buf;
|
|---|
| 405 | }
|
|---|
| 406 | }
|
|---|
| 407 | }
|
|---|
| 408 |
|
|---|
| 409 | /* The Windows API has a function returning the locale's codepage as a
|
|---|
| 410 | number: GetACP(). This encoding is used by Cygwin, unless the user
|
|---|
| 411 | has set the environment variable CYGWIN=codepage:oem (which very few
|
|---|
| 412 | people do).
|
|---|
| 413 | Output directed to console windows needs to be converted (to
|
|---|
| 414 | GetOEMCP() if the console is using a raster font, or to
|
|---|
| 415 | GetConsoleOutputCP() if it is using a TrueType font). Cygwin does
|
|---|
| 416 | this conversion transparently (see winsup/cygwin/fhandler_console.cc),
|
|---|
| 417 | converting to GetConsoleOutputCP(). This leads to correct results,
|
|---|
| 418 | except when SetConsoleOutputCP has been called and a raster font is
|
|---|
| 419 | in use. */
|
|---|
| 420 | sprintf (buf, "CP%u", GetACP ());
|
|---|
| 421 | codeset = buf;
|
|---|
| 422 | }
|
|---|
| 423 | # endif
|
|---|
| 424 |
|
|---|
| 425 | # else
|
|---|
| 426 |
|
|---|
| 427 | /* On old systems which lack it, use setlocale or getenv. */
|
|---|
| 428 | const char *locale = NULL;
|
|---|
| 429 |
|
|---|
| 430 | /* But most old systems don't have a complete set of locales. Some
|
|---|
| 431 | (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't
|
|---|
| 432 | use setlocale here; it would return "C" when it doesn't support the
|
|---|
| 433 | locale name the user has set. */
|
|---|
| 434 | # if 0
|
|---|
| 435 | locale = setlocale (LC_CTYPE, NULL);
|
|---|
| 436 | # endif
|
|---|
| 437 | if (locale == NULL || locale[0] == '\0')
|
|---|
| 438 | {
|
|---|
| 439 | locale = getenv ("LC_ALL");
|
|---|
| 440 | if (locale == NULL || locale[0] == '\0')
|
|---|
| 441 | {
|
|---|
| 442 | locale = getenv ("LC_CTYPE");
|
|---|
| 443 | if (locale == NULL || locale[0] == '\0')
|
|---|
| 444 | locale = getenv ("LANG");
|
|---|
| 445 | }
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | /* On some old systems, one used to set locale = "iso8859_1". On others,
|
|---|
| 449 | you set it to "language_COUNTRY.charset". In any case, we resolve it
|
|---|
| 450 | through the charset.alias file. */
|
|---|
| 451 | codeset = locale;
|
|---|
| 452 |
|
|---|
| 453 | # endif
|
|---|
| 454 |
|
|---|
| 455 | #elif defined WINDOWS_NATIVE
|
|---|
| 456 |
|
|---|
| 457 | static char buf[2 + 10 + 1];
|
|---|
| 458 |
|
|---|
| 459 | /* The Windows API has a function returning the locale's codepage as a
|
|---|
| 460 | number: GetACP().
|
|---|
| 461 | When the output goes to a console window, it needs to be provided in
|
|---|
| 462 | GetOEMCP() encoding if the console is using a raster font, or in
|
|---|
| 463 | GetConsoleOutputCP() encoding if it is using a TrueType font.
|
|---|
| 464 | But in GUI programs and for output sent to files and pipes, GetACP()
|
|---|
| 465 | encoding is the best bet. */
|
|---|
| 466 | sprintf (buf, "CP%u", GetACP ());
|
|---|
| 467 | codeset = buf;
|
|---|
| 468 |
|
|---|
| 469 | #elif defined OS2
|
|---|
| 470 |
|
|---|
| 471 | const char *locale;
|
|---|
| 472 | static char buf[2 + 10 + 1];
|
|---|
| 473 | ULONG cp[3];
|
|---|
| 474 | ULONG cplen;
|
|---|
| 475 |
|
|---|
| 476 | /* Allow user to override the codeset, as set in the operating system,
|
|---|
| 477 | with standard language environment variables. */
|
|---|
| 478 | locale = getenv ("LC_ALL");
|
|---|
| 479 | if (locale == NULL || locale[0] == '\0')
|
|---|
| 480 | {
|
|---|
| 481 | locale = getenv ("LC_CTYPE");
|
|---|
| 482 | if (locale == NULL || locale[0] == '\0')
|
|---|
| 483 | locale = getenv ("LANG");
|
|---|
| 484 | }
|
|---|
| 485 | if (locale != NULL && locale[0] != '\0')
|
|---|
| 486 | {
|
|---|
| 487 | /* If the locale name contains an encoding after the dot, return it. */
|
|---|
| 488 | const char *dot = strchr (locale, '.');
|
|---|
| 489 |
|
|---|
| 490 | if (dot != NULL)
|
|---|
| 491 | {
|
|---|
| 492 | const char *modifier;
|
|---|
| 493 |
|
|---|
| 494 | dot++;
|
|---|
| 495 | /* Look for the possible @... trailer and remove it, if any. */
|
|---|
| 496 | modifier = strchr (dot, '@');
|
|---|
| 497 | if (modifier == NULL)
|
|---|
| 498 | return dot;
|
|---|
| 499 | if (modifier - dot < sizeof (buf))
|
|---|
| 500 | {
|
|---|
| 501 | memcpy (buf, dot, modifier - dot);
|
|---|
| 502 | buf [modifier - dot] = '\0';
|
|---|
| 503 | return buf;
|
|---|
| 504 | }
|
|---|
| 505 | }
|
|---|
| 506 |
|
|---|
| 507 | /* Resolve through the charset.alias file. */
|
|---|
| 508 | codeset = locale;
|
|---|
| 509 | }
|
|---|
| 510 | else
|
|---|
| 511 | {
|
|---|
| 512 | /* OS/2 has a function returning the locale's codepage as a number. */
|
|---|
| 513 | if (DosQueryCp (sizeof (cp), cp, &cplen))
|
|---|
| 514 | codeset = "";
|
|---|
| 515 | else
|
|---|
| 516 | {
|
|---|
| 517 | sprintf (buf, "CP%u", cp[0]);
|
|---|
| 518 | codeset = buf;
|
|---|
| 519 | }
|
|---|
| 520 | }
|
|---|
| 521 |
|
|---|
| 522 | #endif
|
|---|
| 523 |
|
|---|
| 524 | if (codeset == NULL)
|
|---|
| 525 | /* The canonical name cannot be determined. */
|
|---|
| 526 | codeset = "";
|
|---|
| 527 |
|
|---|
| 528 | /* Resolve alias. */
|
|---|
| 529 | for (aliases = get_charset_aliases ();
|
|---|
| 530 | *aliases != '\0';
|
|---|
| 531 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
|
|---|
| 532 | if (strcmp (codeset, aliases) == 0
|
|---|
| 533 | || (aliases[0] == '*' && aliases[1] == '\0'))
|
|---|
| 534 | {
|
|---|
| 535 | codeset = aliases + strlen (aliases) + 1;
|
|---|
| 536 | break;
|
|---|
| 537 | }
|
|---|
| 538 |
|
|---|
| 539 | /* Don't return an empty string. GNU libc and GNU libiconv interpret
|
|---|
| 540 | the empty string as denoting "the locale's character encoding",
|
|---|
| 541 | thus GNU libiconv would call this function a second time. */
|
|---|
| 542 | if (codeset[0] == '\0')
|
|---|
| 543 | codeset = "ASCII";
|
|---|
| 544 |
|
|---|
| 545 | return codeset;
|
|---|
| 546 | }
|
|---|