libconv源代码与生成的库

/* Determine a canonical name for the current locale's character encoding. Copyright (C) 2000-2006, 2008-2018 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 <https://www.gnu.org/licenses/>. */ /* Written by Bruno Haible <bruno@clisp.org>. */ #include <config.h> /* Specification. */ #include "localcharset.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 __CYGWIN__ # 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 # if HAVE_LANGINFO_CODESET # include <langinfo.h> # else # if 0 /* see comment regarding use of setlocale(), 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 HAVE_LANGINFO_CODESET || defined WINDOWS_NATIVE || defined OS2 /* On these platforms, we use a mapping from non-canonical encoding name to GNU canonical encoding name. */ /* With glibc-2.1 or newer, we don't need any canonicalization, because glibc has iconv and both glibc and libiconv support all GNU canonical names directly. */ # if !((defined __GNU_LIBRARY__ && __GLIBC__ >= 2) || defined __UCLIBC__) struct table_entry { const char alias[11+1]; const char canonical[11+1]; }; /* Table of platform-dependent mappings, sorted in ascending order. */ static const struct table_entry alias_table[] = { # if defined __FreeBSD__ /* FreeBSD */ /*{ "ARMSCII-8", "ARMSCII-8" },*/ { "Big5", "BIG5" }, { "C", "ASCII" }, /*{ "CP1131", "CP1131" },*/ /*{ "CP1251", "CP1251" },*/ /*{ "CP866", "CP866" },*/ /*{ "GB18030", "GB18030" },*/ /*{ "GB2312", "GB2312" },*/ /*{ "GBK", "GBK" },*/ /*{ "ISCII-DEV", "?" },*/ { "ISO8859-1", "ISO-8859-1" }, { "ISO8859-13", "ISO-8859-13" }, { "ISO8859-15", "ISO-8859-15" }, { "ISO8859-2", "ISO-8859-2" }, { "ISO8859-5", "ISO-8859-5" }, { "ISO8859-7", "ISO-8859-7" }, { "ISO8859-9", "ISO-8859-9" }, /*{ "KOI8-R", "KOI8-R" },*/ /*{ "KOI8-U", "KOI8-U" },*/ { "SJIS", "SHIFT_JIS" }, { "US-ASCII", "ASCII" }, { "eucCN", "GB2312" }, { "eucJP", "EUC-JP" }, { "eucKR", "EUC-KR" } # define alias_table_defined # endif # if defined __NetBSD__ /* NetBSD */ { "646", "ASCII" }, /*{ "ARMSCII-8", "ARMSCII-8" },*/ /*{ "BIG5", "BIG5" },*/ { "Big5-HKSCS", "BIG5-HKSCS" }, /*{ "CP1251", "CP1251" },*/ /*{ "CP866", "CP866" },*/ /*{ "GB18030", "GB18030" },*/ /*{ "GB2312", "GB2312" },*/ { "ISO8859-1", "ISO-8859-1" }, { "ISO8859-13", "ISO-8859-13" }, { "ISO8859-15", "ISO-8859-15" }, { "ISO8859-2", "ISO-8859-2" }, { "ISO8859-4", "ISO-8859-4" }, { "ISO8859-5", "ISO-8859-5" }, { "ISO8859-7", "ISO-8859-7" }, /*{ "KOI8-R", "KOI8-R" },*/ /*{ "KOI8-U", "KOI8-U" },*/ /*{ "PT154", "PT154" },*/ { "SJIS", "SHIFT_JIS" }, { "eucCN", "GB2312" }, { "eucJP", "EUC-JP" }, { "eucKR", "EUC-KR" }, { "eucTW", "EUC-TW" } # define alias_table_defined # endif # if defined __OpenBSD__ /* OpenBSD */ { "646", "ASCII" }, { "ISO8859-1", "ISO-8859-1" }, { "ISO8859-13", "ISO-8859-13" }, { "ISO8859-15", "ISO-8859-15" }, { "ISO8859-2", "ISO-8859-2" }, { "ISO8859-4", "ISO-8859-4" }, { "ISO8859-5", "ISO-8859-5" }, { "ISO8859-7", "ISO-8859-7" } # define alias_table_defined # endif # if defined __APPLE__ && defined __MACH__ /* Mac OS X */ /* Darwin 7.5 has nl_langinfo(CODESET), but sometimes its value is useless: - It returns the empty string when LANG is set to a locale of the form ll_CC, although ll_CC/LC_CTYPE is a symlink to an UTF-8 LC_CTYPE file. - The environment variables LANG, LC_CTYPE, LC_ALL are not set by the system; nl_langinfo(CODESET) returns "US-ASCII" in this case. - The documentation says: "... all code that calls BSD system routines should ensure that the const *char parameters of these routines are in UTF-8 encoding. All BSD system functions expect their string parameters to be in UTF-8 encoding and nothing else." It also says "An additional caveat is that string parameters for files, paths, and other file-system entities must be in canonical UTF-8. In a canonical UTF-8 Unicode string, all decomposable characters are decomposed ..." but this is not true: You can pass non-decomposed UTF-8 strings to file system functions, and it is the OS which will convert them to decomposed UTF-8 before accessing the file system. - The Apple Terminal application displays UTF-8 by default. - However, other applications are free to use different encodings: - xterm uses ISO-8859-1 by default. - TextEdit uses MacRoman by default. We prefer UTF-8 over decomposed UTF-8-MAC because one should minimize the use of decomposed Unicode. Unfortunately, through the Darwin file system, decomposed UTF-8 strings are leaked into user space nevertheless. Then there are also the locales with encodings other than US-ASCII and UTF-8. These locales can be occasionally useful to users (e.g. when grepping through ISO-8859-1 encoded text files), when all their file names are in US-ASCII. */ { "ARMSCII-8", "ARMSCII-8" }, { "Big5", "BIG5" }, { "Big5HKSCS", "BIG5-HKSCS" }, { "CP1131", "CP1131" }, { "CP1251", "CP1251" }, { "CP866", "CP866" }, { "CP949", "CP949" }, { "GB18030", "GB18030" }, { "GB2312", "GB2312" }, { "GBK", "GBK" }, /*{ "ISCII-DEV", "?" },*/ { "ISO8859-1", "ISO-8859-1" }, { "ISO8859-13", "ISO-8859-13" }, { "ISO8859-15", "ISO-8859-15" }, { "ISO8859-2", "ISO-8859-2" }, { "ISO8859-4", "ISO-8859-4" }, { "ISO8859-5", "ISO-8859-5" }, { "ISO8859-7", "ISO-8859-7" }, { "ISO8859-9", "ISO-8859-9" }, { "KOI8-R", "KOI8-R" }, { "KOI8-U", "KOI8-U" }, { "PT154", "PT154" }, { "SJIS", "SHIFT_JIS" }, { "eucCN", "GB2312" }, { "eucJP", "EUC-JP" }, { "eucKR", "EUC-KR" } # define alias_table_defined # endif # if defined _AIX /* AIX */ /*{ "GBK", "GBK" },*/ { "IBM-1046", "CP1046" }, { "IBM-1124", "CP1124" }, { "IBM-1129", "CP1129" }, { "IBM-1252", "CP1252" }, { "IBM-850", "CP850" }, { "IBM-856", "CP856" }, { "IBM-921", "ISO-8859-13" }, { "IBM-922", "CP922" },