| /* Determine a canonical name for the current locale's character encoding. |
| |
| Copyright (C) 2000-2006, 2008-2012 Free Software Foundation, Inc. |
| |
| This program is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Library General Public License as published |
| by the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public License |
| along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* Written by Bruno Haible <bruno@clisp.org>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "localcharset.h" |
| |
| #include <fcntl.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET |
| # define DARWIN7 /* Darwin 7 or newer, i.e. Mac OS X 10.3 or newer */ |
| #endif |
| |
| #if defined _WIN32 || defined __WIN32__ |
| # define WINDOWS_NATIVE |
| # include <locale.h> |
| #endif |
| |
| #if defined __EMX__ |
| /* Assume EMX program runs on OS/2, even if compiled under DOS. */ |
| # ifndef OS2 |
| # define OS2 |
| # endif |
| #endif |
| |
| #if !defined WINDOWS_NATIVE |
| # include <unistd.h> |
| # if HAVE_LANGINFO_CODESET |
| # include <langinfo.h> |
| # else |
| # if 0 /* see comment below */ |
| # include <locale.h> |
| # endif |
| # endif |
| # ifdef __CYGWIN__ |
| # define WIN32_LEAN_AND_MEAN |
| # include <windows.h> |
| # endif |
| #elif defined WINDOWS_NATIVE |
| # define WIN32_LEAN_AND_MEAN |
| # include <windows.h> |
| #endif |
| #if defined OS2 |
| # define INCL_DOS |
| # include <os2.h> |
| #endif |
| |
| /* For MB_CUR_MAX_L */ |
| #if defined DARWIN7 |
| # include <xlocale.h> |
| #endif |
| |
| #if ENABLE_RELOCATABLE |
| # include "relocatable.h" |
| #else |
| # define relocate(pathname) (pathname) |
| #endif |
| |
| /* Get LIBDIR. */ |
| #ifndef LIBDIR |
| # include "configmake.h" |
| #endif |
| |
| /* Define O_NOFOLLOW to 0 on platforms where it does not exist. */ |
| #ifndef O_NOFOLLOW |
| # define O_NOFOLLOW 0 |
| #endif |
| |
| #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
| /* Native Windows, Cygwin, OS/2, DOS */ |
| # define ISSLASH(C) ((C) == '/' || (C) == '\\') |
| #endif |
| |
| #ifndef DIRECTORY_SEPARATOR |
| # define DIRECTORY_SEPARATOR '/' |
| #endif |
| |
| #ifndef ISSLASH |
| # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR) |
| #endif |
| |
| #if HAVE_DECL_GETC_UNLOCKED |
| # undef getc |
| # define getc getc_unlocked |
| #endif |
| |
| /* The following static variable is declared 'volatile' to avoid a |
| possible multithread problem in the function get_charset_aliases. If we |
| are running in a threaded environment, and if two threads initialize |
| 'charset_aliases' simultaneously, both will produce the same value, |
| and everything will be ok if the two assignments to 'charset_aliases' |
| are atomic. But I don't know what will happen if the two assignments mix. */ |
| #if __STDC__ != 1 |
| # define volatile /* empty */ |
| #endif |
| /* Pointer to the contents of the charset.alias file, if it has already been |
| read, else NULL. Its format is: |
| ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */ |
| static const char * volatile charset_aliases; |
| |
| /* Return a pointer to the contents of the charset.alias file. */ |
| static const char * |
| get_charset_aliases (void) |
| { |
| const char *cp; |
| |
| cp = charset_aliases; |
| if (cp == NULL) |
| { |
| #if !(defined DARWIN7 || defined VMS || defined WINDOWS_NATIVE || defined __CYGWIN__ || defined OS2) |
| const char *dir; |
| const char *base = "charset.alias"; |
| char *file_name; |
| |
| /* Make it possible to override the charset.alias location. This is |
| necessary for running the testsuite before "make install". */ |
| dir = getenv ("CHARSETALIASDIR"); |
| if (dir == NULL || dir[0] == '\0') |
| dir = relocate (LIBDIR); |
| |
| /* Concatenate dir and base into freshly allocated file_name. */ |
| { |
| size_t dir_len = strlen (dir); |
| size_t base_len = strlen (base); |
| int add_slash = (dir_len > 0 && !ISSLASH (dir[dir_len - 1])); |
| file_name = (char *) malloc (dir_len + add_slash + base_len + 1); |
| if (file_name != NULL) |
| { |
| memcpy (file_name, dir, dir_len); |
| if (add_slash) |
| file_name[dir_len] = DIRECTORY_SEPARATOR; |
| memcpy (file_name + dir_len + add_slash, base, base_len + 1); |
| } |
| } |
| |
| if (file_name == NULL) |
| /* Out of memory. Treat the file as empty. */ |
| cp = ""; |
| else |
| { |
| int fd; |
| |
| /* Open the file. Reject symbolic links on platforms that support |
| O_NOFOLLOW. This is a security feature. Without it, an attacker |
| could retrieve parts of the contents (namely, the tail of the |
| first line that starts with "* ") of an arbitrary file by placing |
| a symbolic link to that file under the name "charset.alias" in |
| some writable directory and defining the environment variable |
| CHARSETALIASDIR to point to that directory. */ |
| fd = open (file_name, |
| O_RDONLY | (HAVE_WORKING_O_NOFOLLOW ? O_NOFOLLOW : 0)); |
| if (fd < 0) |
| /* File not found. Treat it as empty. */ |
| cp = ""; |
| else |
| { |
| FILE *fp; |
| |
| fp = fdopen (fd, "r"); |
| if (fp == NULL) |
| { |
| /* Out of memory. Treat the file as empty. */ |
| close (fd); |
| cp = ""; |
| } |
| else |
| { |
| /* Parse the file's contents. */ |
| char *res_ptr = NULL; |
| size_t res_size = 0; |
| |
| for (;;) |
| { |
| int c; |
| char buf1[50+1]; |
| char buf2[50+1]; |
| size_t l1, l2; |
| char *old_res_ptr; |
| |
| c = getc (fp); |
| if (c == EOF) |
| break; |
| if (c == '\n' || c == ' ' || c == '\t') |
| continue; |
| if (c == '#') |
| { |
| /* Skip comment, to end of line. */ |
| do |
| c = getc (fp); |
| while (!(c == EOF || c == '\n')); |
| if (c == EOF) |
| break; |
| continue; |
| } |
| ungetc (c, fp); |
| if (fscanf (fp, "%50s %50s", buf1, buf2) < 2) |
| break; |
| l1 = strlen (buf1); |
| l2 = strlen (buf2); |
| old_res_ptr = res_ptr; |
| if (res_size == 0) |
| { |
| res_size = l1 + 1 + l2 + 1; |
| res_ptr = (char *) malloc (res_size + 1); |
| } |
| else |
| { |
| res_size += l1 + 1 + l2 + 1; |
| res_ptr = (char *) realloc (res_ptr, res_size + 1); |
| } |
| if (res_ptr == NULL) |
| { |
| /* Out of memory. */ |
| res_size = 0; |
| free (old_res_ptr); |
| break; |
| } |
| strcpy (res_ptr + res_size - (l2 + 1) - (l1 + 1), buf1); |
| strcpy (res_ptr + res_size - (l2 + 1), buf2); |
| } |
| fclose (fp); |
| if (res_size == 0) |
| cp = ""; |
| else |
| { |
| *(res_ptr + res_size) = '\0'; |
| cp = res_ptr; |
| } |
| } |
| } |
| |
| free (file_name); |
| } |
| |
| #else |
| |
| # if defined DARWIN7 |
| /* To avoid the trouble of installing a file that is shared by many |
| GNU packages -- many packaging systems have problems with this --, |
| simply inline the aliases here. */ |
| cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" |
| "ISO8859-2" "\0" "ISO-8859-2" "\0" |
| "ISO8859-4" "\0" "ISO-8859-4" "\0" |
| "ISO8859-5" "\0" "ISO-8859-5" "\0" |
| "ISO8859-7" "\0" "ISO-8859-7" "\0" |
| "ISO8859-9" "\0" "ISO-8859-9" "\0" |
| "ISO8859-13" "\0" "ISO-8859-13" "\0" |
| "ISO8859-15" "\0" "ISO-8859-15" "\0" |
| "KOI8-R" "\0" "KOI8-R" "\0" |
| "KOI8-U" "\0" "KOI8-U" "\0" |
| "CP866" "\0" "CP866" "\0" |
| "CP949" "\0" "CP949" "\0" |
| "CP1131" "\0" "CP1131" "\0" |
| "CP1251" "\0" "CP1251" "\0" |
| "eucCN" "\0" "GB2312" "\0" |
| "GB2312" "\0" "GB2312" "\0" |
| "eucJP" "\0" "EUC-JP" "\0" |
| "eucKR" "\0" "EUC-KR" "\0" |
| "Big5" "\0" "BIG5" "\0" |
| "Big5HKSCS" "\0" "BIG5-HKSCS" "\0" |
| "GBK" "\0" "GBK" "\0" |
| "GB18030" "\0" "GB18030" "\0" |
| "SJIS" "\0" "SHIFT_JIS" "\0" |
| "ARMSCII-8" "\0" "ARMSCII-8" "\0" |
| "PT154" "\0" "PT154" "\0" |
| /*"ISCII-DEV" "\0" "?" "\0"*/ |
| "*" "\0" "UTF-8" "\0"; |
| # endif |
| |
| # if defined VMS |
| /* To avoid the troubles of an extra file charset.alias_vms in the |
| sources of many GNU packages, simply inline the aliases here. */ |
| /* The list of encodings is taken from the OpenVMS 7.3-1 documentation |
| "Compaq C Run-Time Library Reference Manual for OpenVMS systems" |
| section 10.7 "Handling Different Character Sets". */ |
| cp = "ISO8859-1" "\0" "ISO-8859-1" "\0" |
| "ISO8859-2" "\0" "ISO-8859-2" "\0" |
| "ISO8859-5" "\0" "ISO-8859-5" "\0" |
| "ISO8859-7" "\0" "ISO-8859-7" "\0" |
| "ISO8859-8" "\0" "ISO-8859-8" "\0" |
| "ISO8859-9" "\0" "ISO-8859-9" "\0" |
| /* Japanese */ |
| "eucJP" "\0" "EUC-JP" "\0" |
| "SJIS" "\0" "SHIFT_JIS" "\0" |
| "DECKANJI" "\0" "DEC-KANJI" "\0" |
| "SDECKANJI" "\0" "EUC-JP" "\0" |
| /* Chinese */ |
| "eucTW" "\0" "EUC-TW" "\0" |
| "DECHANYU" "\0" "DEC-HANYU" "\0" |
| "DECHANZI" "\0" "GB2312" "\0" |
| /* Korean */ |
| "DECKOREAN" "\0" "EUC-KR" "\0"; |
| # endif |
| |
| # if defined WINDOWS_NATIVE || defined __CYGWIN__ |
| /* To avoid the troubles of installing a separate file in the same |
| directory as the DLL and of retrieving the DLL's directory at |
| runtime, simply inline the aliases here. */ |
| |
| cp = "CP936" "\0" "GBK" "\0" |
| "CP1361" "\0" "JOHAB" "\0" |
| "CP20127" "\0" "ASCII" "\0" |
| "CP20866" "\0" "KOI8-R" "\0" |
| "CP20936" "\0" "GB2312" "\0" |
| "CP21866" "\0" "KOI8-RU" "\0" |
| "CP28591" "\0" "ISO-8859-1" "\0" |
| "CP28592" "\0" "ISO-8859-2" "\0" |
| "CP28593" "\0" "ISO-8859-3" "\0" |
| "CP28594" "\0" "ISO-8859-4" "\0" |
| "CP28595" "\0" "ISO-8859-5" "\0" |
| "CP28596" "\0" "ISO-8859-6" "\0" |
| "CP28597" "\0" "ISO-8859-7" "\0" |
| "CP28598" "\0" "ISO-8859-8" "\0" |
| "CP28599" "\0" "ISO-8859-9" "\0" |
| "CP28605" "\0" "ISO-8859-15" "\0" |
| "CP38598" "\0" "ISO-8859-8" "\0" |
| "CP51932" "\0" "EUC-JP" "\0" |
| "CP51936" "\0" "GB2312" "\0" |
| "CP51949" "\0" "EUC-KR" "\0" |
| "CP51950" "\0" "EUC-TW" "\0" |
| "CP54936" "\0" "GB18030" "\0" |
| "CP65001" "\0" "UTF-8" "\0"; |
| # endif |
| # if defined OS2 |
| /* To avoid the troubles of installing a separate file in the same |
| directory as the DLL and of retrieving the DLL's directory at |
| runtime, simply inline the aliases here. */ |
| |
| /* The list of encodings is taken from "List of OS/2 Codepages" |
| by Alex Taylor: |
| <http://altsan.org/os2/toolkits/uls/index.html#codepages>. |
| See also "IBM Globalization - Code page identifiers": |
| <http://www-01.ibm.com/software/globalization/cp/cp_cpgid.html>. */ |
| cp = "CP813" "\0" "ISO-8859-7" "\0" |
| "CP878" "\0" "KOI8-R" "\0" |
| "CP819" "\0" "ISO-8859-1" "\0" |
| "CP912" "\0" "ISO-8859-2" "\0" |
| "CP913" "\0" "ISO-8859-3" "\0" |
| "CP914" "\0" "ISO-8859-4" "\0" |
| "CP915" "\0" "ISO-8859-5" "\0" |
| "CP916" "\0" "ISO-8859-8" "\0" |
| "CP920" "\0" "ISO-8859-9" "\0" |
| "CP921" "\0" "ISO-8859-13" "\0" |
| "CP923" "\0" "ISO-8859-15" "\0" |
| "CP954" "\0" "EUC-JP" "\0" |
| "CP964" "\0" "EUC-TW" "\0" |
| "CP970" "\0" "EUC-KR" "\0" |
| "CP1089" "\0" "ISO-8859-6" "\0" |
| "CP1208" "\0" "UTF-8" "\0" |
| "CP1381" "\0" "GB2312" "\0" |
| "CP1386" "\0" "GBK" "\0" |
| "CP3372" "\0" "EUC-JP" "\0"; |
| # endif |
| #endif |
| |
| charset_aliases = cp; |
| } |
| |
| return cp; |
| } |
| |
| /* Determine the current locale's character encoding, and canonicalize it |
| into one of the canonical names listed in config.charset. |
| The result must not be freed; it is statically allocated. |
| If the canonical name cannot be determined, the result is a non-canonical |
| name. */ |
| |
| #ifdef STATIC |
| STATIC |
| #endif |
| const char * |
| locale_charset (void) |
| { |
| const char *codeset; |
| const char *aliases; |
| |
| #if !(defined WINDOWS_NATIVE || defined OS2) |
| |
| # if HAVE_LANGINFO_CODESET |
| |
| /* Most systems support nl_langinfo (CODESET) nowadays. */ |
| codeset = nl_langinfo (CODESET); |
| |
| # ifdef __CYGWIN__ |
| /* Cygwin < 1.7 does not have locales. nl_langinfo (CODESET) always |
| returns "US-ASCII". Return the suffix of the locale name from the |
| environment variables (if present) or the codepage as a number. */ |
| if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0) |
| { |
| const char *locale; |
| static char buf[2 + 10 + 1]; |
| |
| locale = getenv ("LC_ALL"); |
| if (locale == NULL || locale[0] == '\0') |
| { |
| locale = getenv ("LC_CTYPE"); |
| if (locale == NULL || locale[0] == '\0') |
| locale = getenv ("LANG"); |
| } |
| if (locale != NULL && locale[0] != '\0') |
| { |
| /* If the locale name contains an encoding after the dot, return |
| it. */ |
| const char *dot = strchr (locale, '.'); |
| |
| if (dot != NULL) |
| { |
| const char *modifier; |
| |
| dot++; |
| /* Look for the possible @... trailer and remove it, if any. */ |
| modifier = strchr (dot, '@'); |
| if (modifier == NULL) |
| return dot; |
| if (modifier - dot < sizeof (buf)) |
| { |
| memcpy (buf, dot, modifier - dot); |
| buf [modifier - dot] = '\0'; |
| return buf; |
| } |
| } |
| } |
| |
| /* The Windows API has a function returning the locale's codepage as a |
| number: GetACP(). This encoding is used by Cygwin, unless the user |
| has set the environment variable CYGWIN=codepage:oem (which very few |
| people do). |
| Output directed to console windows needs to be converted (to |
| GetOEMCP() if the console is using a raster font, or to |
| GetConsoleOutputCP() if it is using a TrueType font). Cygwin does |
| this conversion transparently (see winsup/cygwin/fhandler_console.cc), |
| converting to GetConsoleOutputCP(). This leads to correct results, |
| except when SetConsoleOutputCP has been called and a raster font is |
| in use. */ |
| sprintf (buf, "CP%u", GetACP ()); |
| codeset = buf; |
| } |
| # endif |
| |
| # else |
| |
| /* On old systems which lack it, use setlocale or getenv. */ |
| const char *locale = NULL; |
| |
| /* But most old systems don't have a complete set of locales. Some |
| (like SunOS 4 or DJGPP) have only the C locale. Therefore we don't |
| use setlocale here; it would return "C" when it doesn't support the |
| locale name the user has set. */ |
| # if 0 |
| locale = setlocale (LC_CTYPE, NULL); |
| # endif |
| if (locale == NULL || locale[0] == '\0') |
| { |
| locale = getenv ("LC_ALL"); |
| if (locale == NULL || locale[0] == '\0') |
| { |
| locale = getenv ("LC_CTYPE"); |
| if (locale == NULL || locale[0] == '\0') |
| locale = getenv ("LANG"); |
| } |
| } |
| |
| /* On some old systems, one used to set locale = "iso8859_1". On others, |
| you set it to "language_COUNTRY.charset". In any case, we resolve it |
| through the charset.alias file. */ |
| codeset = locale; |
| |
| # endif |
| |
| #elif defined WINDOWS_NATIVE |
| |
| static char buf[2 + 10 + 1]; |
| |
| /* The Windows API has a function returning the locale's codepage as |
| a number, but the value doesn't change according to what the |
| 'setlocale' call specified. So we use it as a last resort, in |
| case the string returned by 'setlocale' doesn't specify the |
| codepage. */ |
| char *current_locale = setlocale (LC_ALL, NULL); |
| char *pdot; |
| |
| /* If they set different locales for different categories, |
| 'setlocale' will return a semi-colon separated list of locale |
| values. To make sure we use the correct one, we choose LC_CTYPE. */ |
| if (strchr (current_locale, ';')) |
| current_locale = setlocale (LC_CTYPE, NULL); |
| |
| pdot = strrchr (current_locale, '.'); |
| if (pdot && 2 + strlen (pdot + 1) + 1 <= sizeof (buf)) |
| sprintf (buf, "CP%s", pdot + 1); |
| else |
| { |
| /* The Windows API has a function returning the locale's codepage as a |
| number: GetACP(). |
| When the output goes to a console window, it needs to be provided in |
| GetOEMCP() encoding if the console is using a raster font, or in |
| GetConsoleOutputCP() encoding if it is using a TrueType font. |
| But in GUI programs and for output sent to files and pipes, GetACP() |
| encoding is the best bet. */ |
| sprintf (buf, "CP%u", GetACP ()); |
| } |
| codeset = buf; |
| |
| #elif defined OS2 |
| |
| const char *locale; |
| static char buf[2 + 10 + 1]; |
| ULONG cp[3]; |
| ULONG cplen; |
| |
| codeset = NULL; |
| |
| /* Allow user to override the codeset, as set in the operating system, |
| with standard language environment variables. */ |
| locale = getenv ("LC_ALL"); |
| if (locale == NULL || locale[0] == '\0') |
| { |
| locale = getenv ("LC_CTYPE"); |
| if (locale == NULL || locale[0] == '\0') |
| locale = getenv ("LANG"); |
| } |
| if (locale != NULL && locale[0] != '\0') |
| { |
| /* If the locale name contains an encoding after the dot, return it. */ |
| const char *dot = strchr (locale, '.'); |
| |
| if (dot != NULL) |
| { |
| const char *modifier; |
| |
| dot++; |
| /* Look for the possible @... trailer and remove it, if any. */ |
| modifier = strchr (dot, '@'); |
| if (modifier == NULL) |
| return dot; |
| if (modifier - dot < sizeof (buf)) |
| { |
| memcpy (buf, dot, modifier - dot); |
| buf [modifier - dot] = '\0'; |
| return buf; |
| } |
| } |
| |
| /* For the POSIX locale, don't use the system's codepage. */ |
| if (strcmp (locale, "C") == 0 || strcmp (locale, "POSIX") == 0) |
| codeset = ""; |
| } |
| |
| if (codeset == NULL) |
| { |
| /* OS/2 has a function returning the locale's codepage as a number. */ |
| if (DosQueryCp (sizeof (cp), cp, &cplen)) |
| codeset = ""; |
| else |
| { |
| sprintf (buf, "CP%u", cp[0]); |
| codeset = buf; |
| } |
| } |
| |
| #endif |
| |
| if (codeset == NULL) |
| /* The canonical name cannot be determined. */ |
| codeset = ""; |
| |
| /* Resolve alias. */ |
| for (aliases = get_charset_aliases (); |
| *aliases != '\0'; |
| aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1) |
| if (strcmp (codeset, aliases) == 0 |
| || (aliases[0] == '*' && aliases[1] == '\0')) |
| { |
| codeset = aliases + strlen (aliases) + 1; |
| break; |
| } |
| |
| /* Don't return an empty string. GNU libc and GNU libiconv interpret |
| the empty string as denoting "the locale's character encoding", |
| thus GNU libiconv would call this function a second time. */ |
| if (codeset[0] == '\0') |
| codeset = "ASCII"; |
| |
| #ifdef DARWIN7 |
| /* Mac OS X sets MB_CUR_MAX to 1 when LC_ALL=C, and "UTF-8" |
| (the default codeset) does not work when MB_CUR_MAX is 1. */ |
| if (strcmp (codeset, "UTF-8") == 0 && MB_CUR_MAX_L (uselocale (NULL)) <= 1) |
| codeset = "ASCII"; |
| #endif |
| |
| return codeset; |
| } |
