Attribute copyright of vlc_current_charset() to Bruno Haible, per his request

(cherry picked from commit 7b76e347)

Conflicts:

	src/text/charset.c

src/text/charset.c

+/*****************************************************************************
+ * charset.c: Locale's character encoding stuff.
+ *****************************************************************************
+ * See also unicode.c for Unicode to locale conversion helpers.
+ *
+ * Copyright (C) 2003-2006 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Derk-Jan Hartman <thedj at users.sf.net>
+ *          Christophe Massiot
+ *          Rémi Denis-Courmont
+ *
+ * vlc_current_charset() an adaption of mp_locale_charset():
+ *
+ *  Copyright (C) 2001-2003 The Mape Project
+ *  Written by Karel Zak  <zakkr@zf.jcu.cz>.
+ *
+ * which itself is an adaptation of locale_charset():
+ *
+ *  Copyright (C) 2000-2002 Free Software Foundation, Inc.
+ *  Written by Bruno Haible <bruno@clisp.org>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc/vlc.h>
+
+#if !defined WIN32
+# ifdef HAVE_LANGINFO_CODESET
+#  include <langinfo.h>
+# endif
+# include <locale.h>
+#else
+# include <windows.h>
+#endif
+
+#ifdef __APPLE__
+#   include <errno.h>
+#   include <string.h>
+#endif
+
+#include <vlc_charset.h>
+
+typedef struct VLCCharsetAlias
+{
+    char *psz_alias, *psz_name;
+} VLCCharsetAlias;
+
+/*
+ * The libcharset load all from external text file, but it's strange and
+ * slow solution, we rather use array(s) compiled into source. In the
+ * "good" libc this is not needful -- for example in linux.
+ *
+ * Please, put to this funtion exotic aliases only. The libc 'iconv' knows
+ * a lot of basic aliases (check it first by iconv -l).
+ *
+ */
+#if (defined OS2 || !defined(HAVE_LANGINFO_CODESET)) && !defined WIN32
+static const char* vlc_encoding_from_language( const char *l )
+{
+    /* check for language (and perhaps country) codes */
+    if (strstr(l, "zh_TW")) return "Big5";
+    if (strstr(l, "zh_HK")) return "Big5HKSCS";   /* no MIME charset */
+    if (strstr(l, "zh")) return "GB2312";
+    if (strstr(l, "th")) return "TIS-620";
+    if (strstr(l, "ja")) return "EUC-JP";
+    if (strstr(l, "ko")) return "EUC-KR";
+    if (strstr(l, "ru")) return "KOI8-R";
+    if (strstr(l, "uk")) return "KOI8-U";
+    if (strstr(l, "pl") || strstr(l, "hr") ||
+        strstr(l, "hu") || strstr(l, "cs") ||
+        strstr(l, "sk") || strstr(l, "sl")) return "ISO-8859-2";
+    if (strstr(l, "eo") || strstr(l, "mt")) return "ISO-8859-3";
+    if (strstr(l, "lt") || strstr(l, "la")) return "ISO-8859-4";
+    if (strstr(l, "bg") || strstr(l, "be") ||
+        strstr(l, "mk") || strstr(l, "uk")) return "ISO-8859-5";
+    if (strstr(l, "ar")) return "ISO-8859-6";
+    if (strstr(l, "el")) return "ISO-8859-7";
+    if (strstr(l, "he") || strstr(l, "iw")) return "ISO-8859-8";
+    if (strstr(l, "tr")) return "ISO-8859-9";
+    if (strstr(l, "th")) return "ISO-8859-11";
+    if (strstr(l, "lv")) return "ISO-8859-13";
+    if (strstr(l, "cy")) return "ISO-8859-14";
+    if (strstr(l, "et")) return "ISO-8859-15"; /* all latin1 could be iso15 as well */
+    if (strstr(l, "ro")) return "ISO-8859-2";   /* or ISO-8859-16 */
+    if (strstr(l, "am") || strstr(l, "vi")) return "UTF-8";
+    /* We don't know. This ain't working go to default. */
+    return "ISO-8859-1";
+}
+#endif
+
+static const char* vlc_charset_aliases( const char *psz_name )
+{
+    VLCCharsetAlias     *a;
+
+#if defined WIN32
+    VLCCharsetAlias aliases[] =
+    {
+        { "CP936",      "GBK" },
+        { "CP1361",     "JOHAB" },
+        { "CP20127",    "ASCII" },
+        { "CP20866",    "KOI8-R" },
+        { "CP21866",    "KOI8-RU" },
+        { "CP28591",    "ISO-8859-1" },
+        { "CP28592",    "ISO-8859-2" },
+        { "CP28593",    "ISO-8859-3" },
+        { "CP28594",    "ISO-8859-4" },
+        { "CP28595",    "ISO-8859-5" },
+        { "CP28596",    "ISO-8859-6" },
+        { "CP28597",    "ISO-8859-7" },
+        { "CP28598",    "ISO-8859-8" },
+        { "CP28599",    "ISO-8859-9" },
+        { "CP28605",    "ISO-8859-15" },
+        { NULL,         NULL }
+    };
+#elif defined (SYS_AIX)
+    VLCCharsetAlias aliases[] =
+    {
+        { "IBM-850",    "CP850" },
+        { "IBM-856",    "CP856" },
+        { "IBM-921",    "ISO-8859-13" },
+        { "IBM-922",    "CP922" },
+        { "IBM-932",    "CP932" },
+        { "IBM-943",    "CP943" },
+        { "IBM-1046",   "CP1046" },
+        { "IBM-1124",   "CP1124" },
+        { "IBM-1129",   "CP1129" },
+        { "IBM-1252",   "CP1252" },
+        { "IBM-EUCCN",  "GB2312" },
+        { "IBM-EUCJP",  "EUC-JP" },
+        { "IBM-EUCKR",  "EUC-KR" },
+        { "IBM-EUCTW",  "EUC-TW" },
+        { NULL, NULL }
+    };
+#elif defined (SYS_HPUX)
+    VLCCharsetAlias aliases[] =
+    {
+        { "ROMAN8",     "HP-ROMAN8" },
+        { "ARABIC8",    "HP-ARABIC8" },
+        { "GREEK8",     "HP-GREEK8" },
+        { "HEBREW8",    "HP-HEBREW8" },
+        { "TURKISH8",   "HP-TURKISH8" },
+        { "KANA8",      "HP-KANA8" },
+        { "HP15CN",     "GB2312" },
+        { NULL, NULL }
+    };
+#elif defined (SYS_IRIX)
+    VLCCharsetAlias aliases[] =
+    {
+        { "EUCCN",      "GB2312" },
+        { NULL, NULL }
+    };
+#elif defined (SYS_OSF)
+    VLCCharsetAlias aliases[] =
+    {
+        { "KSC5601",    "CP949" },
+        { "SDECKANJI",  "EUC-JP" },
+        { "TACTIS",     "TIS-620" },
+        { NULL, NULL }
+    };
+#elif defined (SYS_SOLARIS)
+    VLCCharsetAlias aliases[] =
+    {
+        { "646", "ASCII" },
+        { "CNS11643",   "EUC-TW" },
+        { "5601",       "EUC-KR" },
+        { "JOHAP92",    "JOHAB" },
+        { "PCK", "SHIFT_JIS" },
+        { "2533",       "TIS-620" },
+        { NULL, NULL }
+    };
+#elif defined (SYS_BSD)
+    VLCCharsetAlias aliases[] =
+    {
+        { "646", " ASCII" },
+        { "EUCCN", "GB2312" },
+        { NULL, NULL }
+    };
+#else
+    VLCCharsetAlias aliases[] = {{NULL, NULL}};
+#endif
+
+    for (a = aliases; a->psz_alias; a++)
+        if (strcasecmp (a->psz_alias, psz_name) == 0)
+            return a->psz_name;
+
+    /* we return original name beacuse iconv() probably will know
+     * something better about name if we don't know it :-) */
+    return psz_name;
+}
+
+/* Returns charset from "language_COUNTRY.charset@modifier" string */
+#if (defined OS2 || !defined(HAVE_LANGINFO_CODESET)) && !defined WIN32
+static void vlc_encoding_from_locale( char *psz_locale, char *psz_charset )
+{
+    char *psz_dot = strchr( psz_locale, '.' );
+
+    if( psz_dot != NULL )
+    {
+        const char *psz_modifier;
+
+        psz_dot++;
+
+        /* Look for the possible @... trailer and remove it, if any.  */
+        psz_modifier = strchr( psz_dot, '@' );
+
+        if( psz_modifier == NULL )
+        {
+            strcpy( psz_charset, psz_dot );
+            return;
+        }
+        if( 0 < ( psz_modifier - psz_dot )
+             && ( psz_modifier - psz_dot ) < 2 + 10 + 1 )
+        {
+            memcpy( psz_charset, psz_dot, psz_modifier - psz_dot );
+            psz_charset[ psz_modifier - psz_dot ] = '\0';
+            return;
+        }
+    }
+    /* try language mapping */
+    strcpy( psz_charset, vlc_encoding_from_language( psz_locale ) );
+}
+#endif
+
+vlc_bool_t vlc_current_charset( char **psz_charset )
+{
+    const char *psz_codeset;
+
+#if !(defined WIN32 || defined OS2 || defined __APPLE__)
+
+# ifdef HAVE_LANGINFO_CODESET
+    /* Most systems support nl_langinfo( CODESET ) nowadays.  */
+    psz_codeset = nl_langinfo( CODESET );
+    if( !strcmp( psz_codeset, "ANSI_X3.4-1968" ) )
+        psz_codeset = "ASCII";
+# else
+    /* On old systems which lack it, use setlocale or getenv.  */
+    const char *psz_locale = NULL;
+    char buf[2 + 10 + 1];
+
+    /* 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. Darwin's setlocale is broken. */
+#  if defined (HAVE_SETLOCALE) && !defined (__APPLE__)
+    psz_locale = setlocale( LC_ALL, NULL );
+#  endif
+    if( psz_locale == NULL || psz_locale[0] == '\0' )
+    {
+        psz_locale = getenv( "LC_ALL" );
+        if( psz_locale == NULL || psz_locale[0] == '\0' )
+        {
+            psz_locale = getenv( "LC_CTYPE" );
+            if( psz_locale == NULL || psz_locale[0] == '\0')
+                psz_locale = getenv( "LANG" );
+        }
+    }
+
+    /* On some old systems, one used to set locale = "iso8859_1". On others,
+     * you set it to "language_COUNTRY.charset". Darwin only has LANG :( */
+    vlc_encoding_from_locale( (char *)psz_locale, buf );
+    psz_codeset =  buf;
+# endif /* HAVE_LANGINFO_CODESET */
+
+#elif defined __APPLE__
+
+    /* Darwin is always using UTF-8 internally. */
+    psz_codeset = "UTF-8";
+
+#elif defined WIN32
+
+    char buf[2 + 10 + 1];
+
+    /* Woe32 has a function returning the locale's codepage as a number.  */
+    snprintf( buf, sizeof( buf ), "CP%u", GetACP() );
+    psz_codeset = buf;
+
+#elif defined OS2
+
+    const char *psz_locale;
+    char buf[2 + 10 + 1];
+    ULONG cp[3];
+    ULONG cplen;
+
+    /* Allow user to override the codeset, as set in the operating system,
+     * with standard language environment variables. */
+    psz_locale = getenv( "LC_ALL" );
+    if( psz_locale == NULL || psz_locale[0] == '\0' )
+    {
+        psz+locale = getenv( "LC_CTYPE" );
+        if( psz_locale == NULL || locale[0] == '\0' )
+            locale = getenv( "LANG" );
+    }
+    if( psz_locale != NULL && psz_locale[0] != '\0' )
+        vlc_encoding_from_locale( psz_locale, buf );
+        psz_codeset = buf;
+    else
+    {
+        /* OS/2 has a function returning the locale's codepage as a number. */
+        if( DosQueryCp( sizeof( cp ), cp, &cplen ) )
+            psz_codeset = "";
+        else
+        {
+            snprintf( buf, sizeof( buf ), "CP%u", cp[0] );
+            psz_codeset = buf;
+        }
+    }
+#endif
+    if( psz_codeset == NULL )
+        /* The canonical name cannot be determined. */
+        psz_codeset = "";
+    else
+        psz_codeset = vlc_charset_aliases( psz_codeset );
+
+    /* 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( psz_codeset[0] == '\0' )
+    {
+        /* Last possibility is 'CHARSET' enviroment variable */
+        if( !( psz_codeset = getenv( "CHARSET" ) ) )
+            psz_codeset = "ISO-8859-1";
+    }
+
+    if( psz_charset )
+        *psz_charset = strdup(psz_codeset);
+
+    if( !strcasecmp(psz_codeset, "UTF8") || !strcasecmp(psz_codeset, "UTF-8") )
+        return VLC_TRUE;
+
+    return VLC_FALSE;
+}
+
+
+char *vlc_fix_readdir( const char *psz_string )
+{
+#ifdef __APPLE__
+    vlc_iconv_t hd = vlc_iconv_open( "UTF-8", "UTF-8-MAC" );
+
+    if (hd != (vlc_iconv_t)(-1))
+    {
+        const char *psz_in = psz_string;
+        size_t i_in = strlen(psz_in);
+        size_t i_out = i_in * 2;
+        char *psz_utf8 = malloc(i_out + 1);
+        char *psz_out = psz_utf8;
+
+        size_t i_ret = vlc_iconv (hd, &psz_in, &i_in, &psz_out, &i_out);
+        vlc_iconv_close (hd);
+        if( i_ret == (size_t)(-1) || i_in )
+        {
+            free( psz_utf8 );
+            return strdup( psz_string );
+        }
+
+        *psz_out = '\0';
+        return psz_utf8;
+    }
+#endif
+    return strdup( psz_string );
+}
+
+
+/**
+ * There are two decimal separators in the computer world-wide locales:
+ * dot (which is the american default), and comma (which is used in France,
+ * the country with the most VLC developers, among others).
+ *
+ * i18n_strtod() has the same prototype as ANSI C strtod() but it accepts
+ * either decimal separator when deserializing the string to a float number,
+ * independant of the local computer setting.
+ */
+double i18n_strtod( const char *str, char **end )
+{
+    char *end_buf, e;
+    double d;
+
+    if( end == NULL )
+        end = &end_buf;
+    d = strtod( str, end );
+
+    e = **end;
+    if(( e == ',' ) || ( e == '.' ))
+    {
+        char dup[strlen( str ) + 1];
+        strcpy( dup, str );
+
+        if( dup == NULL )
+            return d;
+
+        dup[*end - str] = ( e == ',' ) ? '.' : ',';
+        d = strtod( dup, end );
+    }
+    return d;
+}
+
+/**
+ * i18n_atof() has the same prototype as ANSI C atof() but it accepts
+ * either decimal separator when deserializing the string to a float number,
+ * independant of the local computer setting.
+ */
+double i18n_atof( const char *str )
+{
+    return i18n_strtod( str, NULL );
+}
+
+
+/**
+ * us_strtod() has the same prototype as ANSI C strtod() but it expects
+ * a dot as decimal separator regardless of the system locale.
+ */
+double us_strtod( const char *str, char **end )
+{
+    char dup[strlen( str ) + 1], *ptr;
+    double d;
+    strcpy( dup, str );
+
+    ptr = strchr( dup, ',' );
+    if( ptr != NULL )
+        *ptr = '\0';
+
+    d = strtod( dup, &ptr );
+    if( end != NULL )
+        *end = (char *)&str[ptr - dup];
+
+    return d;
+}
+
+/**
+ * us_atof() has the same prototype as ANSI C atof() but it expects a dot
+ * as decimal separator, regardless of the system locale.
+ */
+double us_atof( const char *str )
+{
+    return us_strtod( str, NULL );
+}
+