| 1 | /* Determine a canonical name for the current locale's character encoding.
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| 2 |
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| 3 | Copyright (C) 2000-2003 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 it
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| 6 | under the terms of the GNU Library General Public License as published
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| 7 | by the Free Software Foundation; either version 2, 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 GNU
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| 13 | Library 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 Library General Public
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| 16 | License along with this program; if not, write to the Free Software
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| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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| 18 | USA. */
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| 19 |
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| 20 | /* Written by Bruno Haible <bruno@clisp.org>. */
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| 21 |
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| 22 | #ifdef HAVE_CONFIG_H
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| 23 | # include <config.h>
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| 24 | #endif
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| 25 |
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| 26 | /* Specification. */
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| 27 | #include "localcharset.h"
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| 28 |
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| 29 | #if HAVE_STDDEF_H
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| 30 | # include <stddef.h>
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| 31 | #endif
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| 32 |
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| 33 | #include <stdio.h>
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| 34 | #if HAVE_STRING_H
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| 35 | # include <string.h>
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| 36 | #else
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| 37 | # include <strings.h>
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| 38 | #endif
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| 39 | #if HAVE_STDLIB_H
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| 40 | # include <stdlib.h>
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| 41 | #endif
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| 42 |
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| 43 | #if defined _WIN32 || defined __WIN32__
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| 44 | # undef WIN32 /* avoid warning on mingw32 */
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| 45 | # define WIN32
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| 46 | #endif
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| 47 |
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| 48 | #if defined __EMX__
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| 49 | /* Assume EMX program runs on OS/2, even if compiled under DOS. */
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| 50 | # define OS2
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| 51 | #endif
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| 52 |
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| 53 | #if !defined WIN32
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| 54 | # if HAVE_LANGINFO_CODESET
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| 55 | # include <langinfo.h>
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| 56 | # else
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| 57 | # if HAVE_SETLOCALE
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| 58 | # include <locale.h>
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| 59 | # endif
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| 60 | # endif
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| 61 | #elif defined WIN32
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| 62 | # define WIN32_LEAN_AND_MEAN
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| 63 | # include <windows.h>
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| 64 | #endif
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| 65 | #if defined OS2
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| 66 | # define INCL_DOS
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| 67 | # include <os2.h>
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| 68 | #endif
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| 69 |
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| 70 | #if ENABLE_RELOCATABLE
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| 71 | # include "relocatable.h"
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| 72 | #else
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| 73 | # define relocate(pathname) (pathname)
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| 74 | #endif
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| 75 |
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| 76 | #if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
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| 77 | /* Win32, OS/2, DOS */
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| 78 | # define ISSLASH(C) ((C) == '/' || (C) == '\\')
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| 79 | #endif
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| 80 |
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| 81 | #ifndef DIRECTORY_SEPARATOR
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| 82 | # define DIRECTORY_SEPARATOR '/'
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| 83 | #endif
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| 84 |
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| 85 | #ifndef ISSLASH
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| 86 | # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
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| 87 | #endif
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| 88 |
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| 89 | #if HAVE_DECL_GETC_UNLOCKED
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| 90 | # undef getc
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| 91 | # define getc getc_unlocked
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| 92 | #endif
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| 93 |
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| 94 | /* The following static variable is declared 'volatile' to avoid a
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| 95 | possible multithread problem in the function get_charset_aliases. If we
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| 96 | are running in a threaded environment, and if two threads initialize
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| 97 | 'charset_aliases' simultaneously, both will produce the same value,
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| 98 | and everything will be ok if the two assignments to 'charset_aliases'
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| 99 | are atomic. But I don't know what will happen if the two assignments mix. */
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| 100 | #if __STDC__ != 1
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| 101 | # define volatile /* empty */
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| 102 | #endif
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| 103 | /* Pointer to the contents of the charset.alias file, if it has already been
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| 104 | read, else NULL. Its format is:
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| 105 | ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */
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| 106 | static const char * volatile charset_aliases;
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| 107 |
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| 108 | /* Return a pointer to the contents of the charset.alias file. */
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| 109 | static const char *
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| 110 | get_charset_aliases ()
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| 111 | {
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| 112 | const char *cp;
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| 113 |
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| 114 | cp = charset_aliases;
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| 115 | if (cp == NULL)
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| 116 | {
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| 117 | #if !(defined VMS || defined WIN32)
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| 118 | FILE *fp;
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| 119 | const char *dir = relocate (LIBDIR);
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| 120 | const char *base = "charset.alias";
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| 121 | char *file_name;
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| 122 |
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| 123 | /* Concatenate dir and base into freshly allocated file_name. */
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| 124 | {
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| 125 | size_t dir_len = strlen (dir);
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| 126 | size_t base_len = strlen (base);
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| 127 | int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1]));
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| 128 | file_name = (char *) malloc (dir_len + add_slash + base_len + 1);
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| 129 | if (file_name != NULL)
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| 130 | {
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| 131 | memcpy (file_name, dir, dir_len);
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| 132 | if (add_slash)
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| 133 | file_name[dir_len] = DIRECTORY_SEPARATOR;
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| 134 | memcpy (file_name + dir_len + add_slash, base, base_len + 1);
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| 135 | }
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| 136 | }
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| 137 |
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| 138 | if (file_name == NULL || (fp = fopen (file_name, "r")) == NULL)
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| 139 | /* Out of memory or file not found, treat it as empty. */
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| 140 | cp = "";
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| 141 | else
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| 142 | {
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| 143 | /* Parse the file's contents. */
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| 144 | int c;
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| 145 | char buf1[50+1];
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| 146 | char buf2[50+1];
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| 147 | char *res_ptr = NULL;
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| 148 | size_t res_size = 0;
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| 149 | size_t l1, l2;
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| 150 |
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| 151 | for (;;)
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| 152 | {
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| 153 | c = getc (fp);
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| 154 | if (c == EOF)
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| 155 | break;
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| 156 | if (c == '\n' || c == ' ' || c == '\t')
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| 157 | continue;
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| 158 | if (c == '#')
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| 159 | {
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| 160 | /* Skip comment, to end of line. */
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| 161 | do
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| 162 | c = getc (fp);
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| 163 | while (!(c == EOF || c == '\n'));
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| 164 | if (c == EOF)
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| 165 | break;
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| 166 | continue;
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| 167 | }
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| 168 | ungetc (c, fp);
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| 169 | if (fscanf (fp, "%50s %50s", buf1, buf2) < 2)
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| 170 | break;
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| 171 | l1 = strlen (buf1);
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| 172 | l2 = strlen (buf2);
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| 173 | if (res_size == 0)
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| 174 | {
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| 175 | res_size = l1 + 1 + l2 + 1;
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| 176 | res_ptr = (char *) malloc (res_size + 1);
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| 177 | }
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| 178 | else
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| 179 | {
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| 180 | res_size += l1 + 1 + l2 + 1;
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| 181 | res_ptr = (char *) realloc (res_ptr, res_size + 1);
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| 182 | }
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| 183 | if (res_ptr == NULL)
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| 184 | {
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| 185 | /* Out of memory. */
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| 186 | res_size = 0;
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| 187 | break;
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| 188 | }
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| 189 | strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1);
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| 190 | strcpy (res_ptr + res_size - (l2 + 1), buf2);
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| 191 | }
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| 192 | fclose (fp);
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| 193 | if (res_size == 0)
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| 194 | cp = "";
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| 195 | else
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| 196 | {
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| 197 | *(res_ptr + res_size) = '\0';
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| 198 | cp = res_ptr;
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | if (file_name != NULL)
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| 203 | free (file_name);
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| 204 |
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| 205 | #else
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| 206 |
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| 207 | # if defined VMS
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| 208 | /* To avoid the troubles of an extra file charset.alias_vms in the
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| 209 | sources of many GNU packages, simply inline the aliases here. */
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| 210 | /* The list of encodings is taken from the OpenVMS 7.3-1 documentation
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| 211 | "Compaq C Run-Time Library Reference Manual for OpenVMS systems"
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| 212 | section 10.7 "Handling Different Character Sets". */
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| 213 | cp = "ISO8859-1" "\0" "ISO-8859-1" "\0"
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| 214 | "ISO8859-2" "\0" "ISO-8859-2" "\0"
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| 215 | "ISO8859-5" "\0" "ISO-8859-5" "\0"
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| 216 | "ISO8859-7" "\0" "ISO-8859-7" "\0"
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| 217 | "ISO8859-8" "\0" "ISO-8859-8" "\0"
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| 218 | "ISO8859-9" "\0" "ISO-8859-9" "\0"
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| 219 | /* Japanese */
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| 220 | "eucJP" "\0" "EUC-JP" "\0"
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| 221 | "SJIS" "\0" "SHIFT_JIS" "\0"
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| 222 | "DECKANJI" "\0" "DEC-KANJI" "\0"
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| 223 | "SDECKANJI" "\0" "EUC-JP" "\0"
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| 224 | /* Chinese */
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| 225 | "eucTW" "\0" "EUC-TW" "\0"
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| 226 | "DECHANYU" "\0" "DEC-HANYU" "\0"
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| 227 | "DECHANZI" "\0" "GB2312" "\0"
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| 228 | /* Korean */
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| 229 | "DECKOREAN" "\0" "EUC-KR" "\0";
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| 230 | # endif
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| 231 |
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| 232 | # if defined WIN32
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| 233 | /* To avoid the troubles of installing a separate file in the same
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| 234 | directory as the DLL and of retrieving the DLL's directory at
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| 235 | runtime, simply inline the aliases here. */
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| 236 |
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| 237 | cp = "CP936" "\0" "GBK" "\0"
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| 238 | "CP1361" "\0" "JOHAB" "\0"
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| 239 | "CP20127" "\0" "ASCII" "\0"
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| 240 | "CP20866" "\0" "KOI8-R" "\0"
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| 241 | "CP21866" "\0" "KOI8-RU" "\0"
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| 242 | "CP28591" "\0" "ISO-8859-1" "\0"
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| 243 | "CP28592" "\0" "ISO-8859-2" "\0"
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| 244 | "CP28593" "\0" "ISO-8859-3" "\0"
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| 245 | "CP28594" "\0" "ISO-8859-4" "\0"
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| 246 | "CP28595" "\0" "ISO-8859-5" "\0"
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| 247 | "CP28596" "\0" "ISO-8859-6" "\0"
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| 248 | "CP28597" "\0" "ISO-8859-7" "\0"
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| 249 | "CP28598" "\0" "ISO-8859-8" "\0"
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| 250 | "CP28599" "\0" "ISO-8859-9" "\0"
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| 251 | "CP28605" "\0" "ISO-8859-15" "\0";
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| 252 | # endif
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| 253 | #endif
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| 254 |
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| 255 | charset_aliases = cp;
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| 256 | }
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| 257 |
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| 258 | return cp;
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| 259 | }
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| 260 |
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| 261 | /* Determine the current locale's character encoding, and canonicalize it
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| 262 | into one of the canonical names listed in config.charset.
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| 263 | The result must not be freed; it is statically allocated.
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| 264 | If the canonical name cannot be determined, the result is a non-canonical
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| 265 | name. */
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| 266 |
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| 267 | #ifdef STATIC
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| 268 | STATIC
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| 269 | #endif
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| 270 | const char *
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| 271 | locale_charset ()
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| 272 | {
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| 273 | const char *codeset;
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| 274 | const char *aliases;
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| 275 |
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| 276 | #if !(defined WIN32 || defined OS2)
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| 277 |
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| 278 | # if HAVE_LANGINFO_CODESET
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| 279 |
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| 280 | /* Most systems support nl_langinfo (CODESET) nowadays. */
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| 281 | codeset = nl_langinfo (CODESET);
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| 282 |
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| 283 | # else
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| 284 |
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| 285 | /* On old systems which lack it, use setlocale or getenv. */
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| 286 | const char *locale = NULL;
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| 287 |
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| 288 | /* But most old systems don't have a complete set of locales. Some
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| 289 | (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't
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| 290 | use setlocale here; it would return "C" when it doesn't support the
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| 291 | locale name the user has set. */
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| 292 | # if HAVE_SETLOCALE && 0
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| 293 | locale = setlocale (LC_CTYPE, NULL);
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| 294 | # endif
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| 295 | if (locale == NULL || locale[0] == '\0')
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| 296 | {
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| 297 | locale = getenv ("LC_ALL");
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| 298 | if (locale == NULL || locale[0] == '\0')
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| 299 | {
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| 300 | locale = getenv ("LC_CTYPE");
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| 301 | if (locale == NULL || locale[0] == '\0')
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| 302 | locale = getenv ("LANG");
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| 303 | }
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| 304 | }
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| 305 |
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| 306 | /* On some old systems, one used to set locale = "iso8859_1". On others,
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| 307 | you set it to "language_COUNTRY.charset". In any case, we resolve it
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| 308 | through the charset.alias file. */
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| 309 | codeset = locale;
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| 310 |
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| 311 | # endif
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| 312 |
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| 313 | #elif defined WIN32
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| 314 |
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| 315 | static char buf[2 + 10 + 1];
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| 316 |
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| 317 | /* Woe32 has a function returning the locale's codepage as a number. */
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| 318 | sprintf (buf, "CP%u", GetACP ());
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| 319 | codeset = buf;
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| 320 |
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| 321 | #elif defined OS2
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| 322 |
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| 323 | const char *locale;
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| 324 | static char buf[2 + 10 + 1];
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| 325 | ULONG cp[3];
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| 326 | ULONG cplen;
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| 327 |
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| 328 | /* Allow user to override the codeset, as set in the operating system,
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| 329 | with standard language environment variables. */
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| 330 | locale = getenv ("LC_ALL");
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| 331 | if (locale == NULL || locale[0] == '\0')
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| 332 | {
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| 333 | locale = getenv ("LC_CTYPE");
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| 334 | if (locale == NULL || locale[0] == '\0')
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| 335 | locale = getenv ("LANG");
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| 336 | }
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| 337 | if (locale != NULL && locale[0] != '\0')
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| 338 | {
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| 339 | /* If the locale name contains an encoding after the dot, return it. */
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| 340 | const char *dot = strchr (locale, '.');
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| 341 |
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| 342 | if (dot != NULL)
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| 343 | {
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| 344 | const char *modifier;
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| 345 |
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| 346 | dot++;
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| 347 | /* Look for the possible @... trailer and remove it, if any. */
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| 348 | modifier = strchr (dot, '@');
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| 349 | if (modifier == NULL)
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| 350 | return dot;
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| 351 | if (modifier - dot < sizeof (buf))
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| 352 | {
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| 353 | memcpy (buf, dot, modifier - dot);
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| 354 | buf [modifier - dot] = '\0';
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| 355 | return buf;
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| 356 | }
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| 357 | }
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| 358 |
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| 359 | /* Resolve through the charset.alias file. */
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| 360 | codeset = locale;
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| 361 | }
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| 362 | else
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| 363 | {
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| 364 | /* OS/2 has a function returning the locale's codepage as a number. */
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| 365 | if (DosQueryCp (sizeof (cp), cp, &cplen))
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| 366 | codeset = "";
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| 367 | else
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| 368 | {
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| 369 | sprintf (buf, "CP%u", cp[0]);
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| 370 | codeset = buf;
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| 371 | }
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| 372 | }
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| 373 |
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| 374 | #endif
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| 375 |
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| 376 | if (codeset == NULL)
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| 377 | /* The canonical name cannot be determined. */
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| 378 | codeset = "";
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| 379 |
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| 380 | /* Resolve alias. */
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| 381 | for (aliases = get_charset_aliases ();
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| 382 | *aliases != '\0';
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| 383 | aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
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| 384 | if (strcmp (codeset, aliases) == 0
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| 385 | || (aliases[0] == '*' && aliases[1] == '\0'))
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| 386 | {
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| 387 | codeset = aliases + strlen (aliases) + 1;
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| 388 | break;
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| 389 | }
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| 390 |
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| 391 | /* Don't return an empty string. GNU libc and GNU libiconv interpret
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| 392 | the empty string as denoting "the locale's character encoding",
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| 393 | thus GNU libiconv would call this function a second time. */
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| 394 | if (codeset[0] == '\0')
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| 395 | codeset = "ASCII";
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| 396 |
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| 397 | return codeset;
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| 398 | }
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