From dccce9eae10e099d791cc055dd02d3dda731778e Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 31 May 2001 20:27:37 +0000
Subject: [PATCH] added wxLocale::GetSystemEncoding

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10394 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/latex/wx/font.tex      |  62 +++++++++
 docs/latex/wx/fontmap.tex   |   5 +-
 docs/latex/wx/locale.tex    |  20 +++
 include/wx/intl.h           |  26 ++--
 include/wx/strconv.h        |   3 +
 samples/console/console.cpp |  12 +-
 src/common/intl.cpp         | 114 ++++++++++++++---
 src/common/strconv.cpp      | 242 +++++++++++++++++-------------------
 8 files changed, 326 insertions(+), 158 deletions(-)

diff --git a/docs/latex/wx/font.tex b/docs/latex/wx/font.tex
index 1c02b9bc44..1c3682a2f5 100644
--- a/docs/latex/wx/font.tex
+++ b/docs/latex/wx/font.tex
@@ -13,6 +13,68 @@ a window's text.
 
 <wx/font.h>
 
+\wxheading{Constants}
+
+\begin{verbatim}
+enum wxFontEncoding
+{
+    wxFONTENCODING_SYSTEM = -1,     // system default
+    wxFONTENCODING_DEFAULT,         // current default encoding
+
+    // ISO8859 standard defines a number of single-byte charsets
+    wxFONTENCODING_ISO8859_1,       // West European (Latin1)
+    wxFONTENCODING_ISO8859_2,       // Central and East European (Latin2)
+    wxFONTENCODING_ISO8859_3,       // Esperanto (Latin3)
+    wxFONTENCODING_ISO8859_4,       // Baltic (old) (Latin4)
+    wxFONTENCODING_ISO8859_5,       // Cyrillic
+    wxFONTENCODING_ISO8859_6,       // Arabic
+    wxFONTENCODING_ISO8859_7,       // Greek
+    wxFONTENCODING_ISO8859_8,       // Hebrew
+    wxFONTENCODING_ISO8859_9,       // Turkish (Latin5)
+    wxFONTENCODING_ISO8859_10,      // Variation of Latin4 (Latin6)
+    wxFONTENCODING_ISO8859_11,      // Thai
+    wxFONTENCODING_ISO8859_12,      // doesn't exist currently, but put it
+                                    // here anyhow to make all ISO8859
+                                    // consecutive numbers
+    wxFONTENCODING_ISO8859_13,      // Baltic (Latin7)
+    wxFONTENCODING_ISO8859_14,      // Latin8
+    wxFONTENCODING_ISO8859_15,      // Latin9 (a.k.a. Latin0, includes euro)
+    wxFONTENCODING_ISO8859_MAX,
+
+    // Cyrillic charset soup (see http://czyborra.com/charsets/cyrillic.html)
+    wxFONTENCODING_KOI8,            // we don't support any of KOI8 variants
+    wxFONTENCODING_ALTERNATIVE,     // same as MS-DOS CP866
+    wxFONTENCODING_BULGARIAN,       // used under Linux in Bulgaria
+
+    // what would we do without Microsoft? They have their own encodings
+        // for DOS
+    wxFONTENCODING_CP437,           // original MS-DOS codepage
+    wxFONTENCODING_CP850,           // CP437 merged with Latin1
+    wxFONTENCODING_CP852,           // CP437 merged with Latin2
+    wxFONTENCODING_CP855,           // another cyrillic encoding
+    wxFONTENCODING_CP866,           // and another one
+        // and for Windows
+    wxFONTENCODING_CP874,           // WinThai
+    wxFONTENCODING_CP1250,          // WinLatin2
+    wxFONTENCODING_CP1251,          // WinCyrillic
+    wxFONTENCODING_CP1252,          // WinLatin1
+    wxFONTENCODING_CP1253,          // WinGreek (8859-7)
+    wxFONTENCODING_CP1254,          // WinTurkish
+    wxFONTENCODING_CP1255,          // WinHebrew
+    wxFONTENCODING_CP1256,          // WinArabic
+    wxFONTENCODING_CP1257,          // WinBaltic (same as Latin 7)
+    wxFONTENCODING_CP12_MAX,
+
+    wxFONTENCODING_UTF7,            // UTF-7 Unicode encoding
+    wxFONTENCODING_UTF8,            // UTF-8 Unicode encoding
+
+    wxFONTENCODING_UNICODE,         // Unicode - currently used only by
+                                    // wxEncodingConverter class
+
+    wxFONTENCODING_MAX
+};
+\end{verbatim}
+
 \wxheading{Predefined objects}
 
 Objects:
diff --git a/docs/latex/wx/fontmap.tex b/docs/latex/wx/fontmap.tex
index c9460d4a53..fbf85fdf19 100644
--- a/docs/latex/wx/fontmap.tex
+++ b/docs/latex/wx/fontmap.tex
@@ -31,10 +31,9 @@ for "equivalent" encodings (e.g. iso8859-2 and cp1250) and tries them.
 
 If you need to display text in encoding which is not available at
 host system (see \helpref{IsEncodingAvailable}{wxfontmapperisencodingavailable}),
-you may use these two classes to a) find font in some similar encoding
+you may use these two classes to find font in some similar encoding
 (see \helpref{GetAltForEncoding}{wxfontmappergetaltforencoding})
-and
-b) convert the text to this encoding 
+and convert the text to this encoding 
 (\helpref{wxEncodingConverter::Convert}{wxencodingconverterconvert}).
 
 Following code snippet demonstrates it:
diff --git a/docs/latex/wx/locale.tex b/docs/latex/wx/locale.tex
index d4ef2d3254..4f529eb69a 100644
--- a/docs/latex/wx/locale.tex
+++ b/docs/latex/wx/locale.tex
@@ -438,6 +438,26 @@ Returns current platform-specific locale name as passed to setlocale().
 Compare \helpref{GetCanonicalName}{wxlocalegetcanonicalname}.
 
 
+\membersection{wxLocale::GetSystemEncoding}\label{wxlocalegetsystemencoding}
+
+\constfunc{static wxFontEncoding}{GetSystemEncoding}{\void}
+
+Tries to detect the user's default font encoding.
+Returns \helpref{wxFontEncoding}{wxfont} value or 
+{\bf wxFONTENCODING\_SYSTEM} if it couldn't be determined.
+
+\membersection{wxLocale::GetSystemEncodingName}\label{wxlocalegetsystemencodingname}
+
+\constfunc{static wxString}{GetSystemEncodingName}{\void}
+
+Tries to detect the name of the user's default font encoding. This string isn't
+particularly useful for the application as its form is platform-dependent and
+so you should probably use 
+\helpref{GetSystemEncoding}{wxlocalegetsystemencoding} instead.
+
+Returns a user-readable string value or an empty string if it couldn't be
+determined.
+
 \membersection{wxLocale::GetSystemLanguage}\label{wxlocalegetsystemlanguage}
 
 \constfunc{static int}{GetSystemLanguage}{\void}
diff --git a/include/wx/intl.h b/include/wx/intl.h
index aaf724eacd..a8e8233277 100644
--- a/include/wx/intl.h
+++ b/include/wx/intl.h
@@ -9,8 +9,8 @@
 // Licence:     wxWindows license
 /////////////////////////////////////////////////////////////////////////////
 
-#ifndef   __INTLH__
-#define   __INTLH__
+#ifndef _WX_INTL_H_
+#define _WX_INTL_H_
 
 #ifdef __GNUG__
     #pragma interface "intl.h"
@@ -21,6 +21,8 @@
 
 #if wxUSE_INTL
 
+#include "wx/fontenc.h"
+
 // ============================================================================
 // global decls
 // ============================================================================
@@ -301,8 +303,6 @@ enum wxLanguage
 
 // --- --- --- generated code ends here --- --- ---
 
-
-
 // ----------------------------------------------------------------------------
 // wxLanguageInfo: encapsulates wxLanguage to OS native lang.desc.
 //                 translation information
@@ -313,8 +313,9 @@ struct WXDLLEXPORT wxLanguageInfo
     int Language;                   // wxLanguage id
     wxString CanonicalName;         // Canonical name, e.g. fr_FR
 #ifdef __WIN32__
-    wxUint32 WinLang, WinSublang;   // Win32 language identifiers
-#endif
+    wxUint32 WinLang,               // Win32 language identifiers
+             WinSublang;
+#endif // __WIN32__
     wxString Description;           // human-readable name of the language
 };
 
@@ -329,7 +330,6 @@ enum wxLocaleInitFlags
     wxLOCALE_CONV_ENCODING = 0x0002      // convert encoding on the fly?
 };
 
-
 class WXDLLEXPORT wxLocale
 {
 public:
@@ -370,6 +370,14 @@ public:
     // Return wxLANGUAGE_UNKNOWN if language-guessing algorithm failed
     static int GetSystemLanguage();
 
+    // get the encoding used by default for text on this system, returns
+    // wxFONTENCODING_SYSTEM if it couldn't be determined
+    static wxFontEncoding GetSystemEncoding();
+
+    // get the string describing the system encoding, return empty string if
+    // couldn't be determined
+    static wxString GetSystemEncodingName();
+
     // return TRUE if the locale was set successfully
     bool IsOk() const { return m_pszOldLocale != NULL; }
 
@@ -492,5 +500,5 @@ inline const wxChar *wxGetTranslation(const wxChar *sz) { return sz; }
     #define gettext_noop(str) _T(str)
 #endif
 
-#endif
-    // _WX_INTLH__
+#endif // _WX_INTL_H_
+
diff --git a/include/wx/strconv.h b/include/wx/strconv.h
index 92d5729370..9ed3790af0 100644
--- a/include/wx/strconv.h
+++ b/include/wx/strconv.h
@@ -23,6 +23,7 @@
 #if defined(__VISAGECPP__) && __IBMCPP__ >= 400
 #  undef __BSEXCPT__
 #endif
+
 #include <stdlib.h>
 
 #if wxUSE_WCHAR_T
@@ -133,6 +134,8 @@ public:
 private:
     void SetName(const wxChar *charset);
 
+    // note that we can't use wxString here because of compilation
+    // dependencies: we're included from wx/string.h
     wxChar *m_name;
     wxCharacterSet *m_cset;
     bool m_deferred;
diff --git a/samples/console/console.cpp b/samples/console/console.cpp
index c89655a181..6af976b9fe 100644
--- a/samples/console/console.cpp
+++ b/samples/console/console.cpp
@@ -39,7 +39,7 @@
 //#define TEST_CHARSET
 //#define TEST_CMDLINE
 //#define TEST_DATETIME
-#define TEST_DIR
+//#define TEST_DIR
 //#define TEST_DLLLOADER
 //#define TEST_ENVIRON
 //#define TEST_EXECUTE
@@ -50,7 +50,7 @@
 //#define TEST_HASH
 //#define TEST_INFO_FUNCTIONS
 //#define TEST_LIST
-//#define TEST_LOCALE
+#define TEST_LOCALE
 //#define TEST_LOG
 //#define TEST_LONGLONG
 //#define TEST_MIME
@@ -1173,11 +1173,19 @@ static void TestDefaultLang()
         _T("klingonese"),   // I bet on some systems it does exist...
     };
 
+    wxPrintf(_T("The default system encoding is %s (%d)\n"),
+             wxLocale::GetSystemEncodingName().c_str(),
+             wxLocale::GetSystemEncoding());
+
     for ( size_t n = 0; n < WXSIZEOF(langStrings); n++ )
     {
         const char *langStr = langStrings[n];
         if ( langStr )
+        {
+            // FIXME: this doesn't do anything at all under Windows, we need
+            //        to create a new wxLocale!
             wxSetEnv(_T("LC_ALL"), langStr);
+        }
 
         int lang = gs_localeDefault.GetSystemLanguage();
         printf("Locale for '%s' is %s.\n",
diff --git a/src/common/intl.cpp b/src/common/intl.cpp
index c3e563c245..42e01b6274 100644
--- a/src/common/intl.cpp
+++ b/src/common/intl.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        intl.cpp
+// Name:        src/common/intl.cpp
 // Purpose:     Internationalization and localisation for wxWindows
 // Author:      Vadim Zeitlin
 // Modified by:
@@ -31,27 +31,30 @@
 #if wxUSE_INTL
 
 // standard headers
-#include  <locale.h>
-#include  <ctype.h>
+#include <locale.h>
+#include <ctype.h>
+#include <stdlib.h>
 
 // wxWindows
-#include "wx/defs.h"
-#include "wx/string.h"
-#include "wx/tokenzr.h"
-#include "wx/intl.h"
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+    #include "wx/intl.h"
+    #include "wx/log.h"
+    #include "wx/debug.h"
+    #include "wx/utils.h"
+    #include "wx/dynarray.h"
+#endif // WX_PRECOMP
+
 #include "wx/file.h"
-#include "wx/log.h"
-#include "wx/debug.h"
-#include "wx/utils.h"
-#include "wx/dynarray.h"
+#include "wx/tokenzr.h"
 #include "wx/module.h"
+
 #ifdef __WIN32__
-#include "wx/msw/private.h"
+    #include "wx/msw/private.h"
+#elif defined(__UNIX_LIKE__)
+    #include "wx/fontmap.h"         // for CharsetToEncoding()
 #endif
 
-
-#include <stdlib.h>
-
 // ----------------------------------------------------------------------------
 // simple types
 // ----------------------------------------------------------------------------
@@ -930,6 +933,87 @@ void wxLocale::AddCatalogLookupPathPrefix(const wxString& prefix)
     return wxLANGUAGE_UNKNOWN;
 }
 
+// ----------------------------------------------------------------------------
+// encoding stuff
+// ----------------------------------------------------------------------------
+
+// this is a bit strange as under Windows we get the encoding name using its
+// numeric value and under Unix we do it the other way round, but this just
+// reflects the way different systems provide he encoding info
+
+/* static */
+wxString wxLocale::GetSystemEncodingName()
+{
+    wxString encname;
+
+#ifdef __WIN32__
+    // FIXME: what is the error return value for GetACP()?
+    UINT codepage = ::GetACP();
+    encname.Printf(_T("cp%u"), codepage);
+#elif defined(__UNIX_LIKE__)
+
+#if defined(HAVE_LANGINFO_H) && defined(CODESET)
+    // GNU libc provides current character set this way (this conforms
+    // to Unix98)
+    char *alang = nl_langinfo(CODESET);
+    if (alang)
+    {
+        encname = wxConvLibc.cMB2WX(alang);
+    }
+    else
+#endif // HAVE_LANGINFO_H
+    {
+        // if we can't get at the character set directly, try to see if it's in
+        // the environment variables (in most cases this won't work, but I was
+        // out of ideas)
+        wxChar *lang = wxGetenv(wxT("LC_ALL"));
+        wxChar *dot = lang ? wxStrchr(lang, wxT('.')) : (wxChar *)NULL;
+        if (!dot)
+        {
+            lang = wxGetenv(wxT("LC_CTYPE"));
+            if ( lang )
+                dot = wxStrchr(lang, wxT('.'));
+        }
+        if (!dot)
+        {
+            lang = wxGetenv(wxT("LANG"));
+            if ( lang )
+                dot = wxStrchr(lang, wxT('.'));
+        }
+
+        if ( dot )
+        {
+            encname = dot+1;
+        }
+    }
+#endif // Win32/Unix
+
+    return encname;
+}
+
+/* static */
+wxFontEncoding wxLocale::GetSystemEncoding()
+{
+#ifdef __WIN32__
+    UINT codepage = ::GetACP();
+
+    // wxWindows only knows about CP1250-1257
+    if ( codepage >= 1250 && codepage <= 1257 )
+    {
+        return (wxFontEncoding)(wxFONTENCODING_CP1250 + codepage - 1250);
+    }
+#elif defined(__UNIX_LIKE__)
+    wxString encname = GetSystemEncodingName();
+    if ( !encname.empty() )
+    {
+        return wxFontMapper::CharsetToEncoding(encname,
+                                               FALSE /* not interactive */);
+    }
+#endif // Win32/Unix
+
+    return wxFONTENCODING_SYSTEM;
+}
+
 /*static*/ void wxLocale::AddLanguage(const wxLanguageInfo& info)
 {
     CreateLanguagesDB();
diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index 1b69297e1d..33b934ef9f 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -93,18 +93,18 @@ WXDLLEXPORT_DATA(wxMBConv *) wxConvCurrent = &wxConvLibc;
 
 static size_t encode_utf16(wxUint32 input,wxUint16*output)
 {
-    if (input<=0xffff) 
+    if (input<=0xffff)
     {
         if (output) *output++ = input;
         return 1;
-    } 
-    else if (input>=0x110000) 
+    }
+    else if (input>=0x110000)
     {
         return (size_t)-1;
-    } 
-    else 
+    }
+    else
     {
-        if (output) 
+        if (output)
         {
             *output++ = (input >> 10)+0xd7c0;
             *output++ = (input&0x3ff)+0xdc00;
@@ -115,17 +115,17 @@ static size_t encode_utf16(wxUint32 input,wxUint16*output)
 
 static size_t decode_utf16(wxUint16*input,wxUint32&output)
 {
-    if ((*input<0xd800) || (*input>0xdfff)) 
+    if ((*input<0xd800) || (*input>0xdfff))
     {
         output = *input;
         return 1;
-    } 
-    else if ((input[1]<0xdc00) || (input[1]>=0xdfff)) 
+    }
+    else if ((input[1]<0xdc00) || (input[1]>=0xdfff))
     {
         output = *input;
         return (size_t)-1;
-    } 
-    else 
+    }
+    else
     {
         output = ((input[0] - 0xd7c0) << 10) + (input[1] - 0xdc00);
         return 2;
@@ -209,11 +209,11 @@ WXDLLEXPORT_DATA(wxMBConvGdk) wxConvGdk;
 
 size_t wxMBConvGdk::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
-    if (buf) 
+    if (buf)
     {
         return gdk_mbstowcs((GdkWChar *)buf, psz, n);
-    } 
-    else 
+    }
+    else
     {
         GdkWChar *nbuf = new GdkWChar[n=strlen(psz)];
         size_t len = gdk_mbstowcs(nbuf, psz, n);
@@ -226,12 +226,12 @@ size_t wxMBConvGdk::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 {
     char *mbstr = gdk_wcstombs((GdkWChar *)psz);
     size_t len = mbstr ? strlen(mbstr) : 0;
-    if (buf) 
+    if (buf)
     {
-        if (len > n) 
+        if (len > n)
             len = n;
         memcpy(buf, psz, len);
-        if (len < n) 
+        if (len < n)
             buf[len] = 0;
     }
     return len;
@@ -276,49 +276,49 @@ size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
 
 WXDLLEXPORT_DATA(wxMBConvUTF8) wxConvUTF8;
 
-static wxUint32 utf8_max[]= 
+static wxUint32 utf8_max[]=
     { 0x7f, 0x7ff, 0xffff, 0x1fffff, 0x3ffffff, 0x7fffffff, 0xffffffff };
 
 size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
     size_t len = 0;
 
-    while (*psz && ((!buf) || (len < n))) 
+    while (*psz && ((!buf) || (len < n)))
     {
         unsigned char cc = *psz++, fc = cc;
         unsigned cnt;
-        for (cnt = 0; fc & 0x80; cnt++) 
+        for (cnt = 0; fc & 0x80; cnt++)
             fc <<= 1;
-        if (!cnt) 
+        if (!cnt)
         {
             // plain ASCII char
-            if (buf) 
+            if (buf)
                 *buf++ = cc;
             len++;
-        } 
-        else 
+        }
+        else
         {
             cnt--;
-            if (!cnt) 
+            if (!cnt)
             {
                 // invalid UTF-8 sequence
                 return (size_t)-1;
-            } 
-            else 
+            }
+            else
             {
                 unsigned ocnt = cnt - 1;
                 wxUint32 res = cc & (0x3f >> cnt);
-                while (cnt--) 
+                while (cnt--)
                 {
                     cc = *psz++;
-                    if ((cc & 0xC0) != 0x80) 
+                    if ((cc & 0xC0) != 0x80)
                     {
                         // invalid UTF-8 sequence
                         return (size_t)-1;
                     }
                     res = (res << 6) | (cc & 0x3f);
                 }
-                if (res <= utf8_max[ocnt]) 
+                if (res <= utf8_max[ocnt])
                 {
                     // illegal UTF-8 encoding
                     return (size_t)-1;
@@ -327,18 +327,18 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
                 size_t pa = encode_utf16(res, buf);
                 if (pa == (size_t)-1)
                   return (size_t)-1;
-                if (buf) 
+                if (buf)
                     buf += pa;
                 len += pa;
 #else
-                if (buf) 
+                if (buf)
                     *buf++ = res;
                 len++;
 #endif
             }
         }
     }
-    if (buf && (len < n)) 
+    if (buf && (len < n))
         *buf = 0;
     return len;
 }
@@ -347,7 +347,7 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 {
     size_t len = 0;
 
-    while (*psz && ((!buf) || (len < n))) 
+    while (*psz && ((!buf) || (len < n)))
     {
         wxUint32 cc;
 #ifdef WC_UTF16
@@ -358,18 +358,18 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 #endif
         unsigned cnt;
         for (cnt = 0; cc > utf8_max[cnt]; cnt++) {}
-        if (!cnt) 
+        if (!cnt)
         {
             // plain ASCII char
-            if (buf) 
+            if (buf)
                 *buf++ = cc;
             len++;
-        } 
-    
-        else 
+        }
+
+        else
         {
             len += cnt + 1;
-            if (buf) 
+            if (buf)
             {
                 *buf++ = (-128 >> cnt) | ((cc >> (cnt * 6)) & (0x3f >> cnt));
                 while (cnt--)
@@ -401,11 +401,11 @@ WXDLLEXPORT_DATA(wxCSConv) wxConvLocal((const wxChar *)NULL);
 // this should work if M$ Internet Exploiter is installed
 static long CharsetToCodepage(const wxChar *name)
 {
-    if (!name) 
+    if (!name)
         return GetACP();
-        
+
     long CP=-1;
-    
+
     wxString cn(name);
     do {
         wxString path(wxT("MIME\\Database\\Charset\\"));
@@ -413,7 +413,7 @@ static long CharsetToCodepage(const wxChar *name)
         wxRegKey key(wxRegKey::HKCR, path);
 
         if (!key.Exists()) continue;
-        
+
         // two cases: either there's an AliasForCharset string,
         // or there are Codepage and InternetEncoding dwords.
         // The InternetEncoding gives us the actual encoding,
@@ -421,12 +421,12 @@ static long CharsetToCodepage(const wxChar *name)
         // use when displaying the data.
         if (key.HasValue(wxT("InternetEncoding")) &&
             key.QueryValue(wxT("InternetEncoding"), &CP)) break;
-        
+
         // no encoding, see if it's an alias
         if (!key.HasValue(wxT("AliasForCharset")) ||
             !key.QueryValue(wxT("AliasForCharset"), cn)) break;
     } while (1);
-    
+
     return CP;
 }
 #endif
@@ -438,7 +438,7 @@ public:
         : cname(name) {}
     virtual ~wxCharacterSet()
         {}
-    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) 
+    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
         { return (size_t)-1; }
     virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
         { return (size_t)-1; }
@@ -453,13 +453,13 @@ class ID_CharSet : public wxCharacterSet
 public:
     ID_CharSet(const wxChar *name,wxMBConv *cnv)
         : wxCharacterSet(name), work(cnv) {}
-        
+
     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
         { return work ? work->MB2WC(buf,psz,n) : (size_t)-1; }
-        
+
     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
         { return work ? work->WC2MB(buf,psz,n) : (size_t)-1; }
-        
+
     bool usable()
         { return work!=NULL; }
 public:
@@ -486,21 +486,21 @@ public:
 class IC_CharSet : public wxCharacterSet
 {
 public:
-    IC_CharSet(const wxChar *name) 
+    IC_CharSet(const wxChar *name)
         : wxCharacterSet(name)
     {
         m2w = iconv_open(WC_NAME, wxConvLibc.cWX2MB(cname));
         w2m = iconv_open(wxConvLibc.cWX2MB(cname), WC_NAME);
     }
-    
+
     ~IC_CharSet()
     {
-        if ( m2w != (iconv_t)-1 ) 
+        if ( m2w != (iconv_t)-1 )
             iconv_close(m2w);
-        if ( w2m != (iconv_t)-1 ) 
+        if ( w2m != (iconv_t)-1 )
             iconv_close(w2m);
     }
-    
+
     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
     {
         size_t inbuf = strlen(psz);
@@ -540,13 +540,13 @@ public:
                 res += 8-(outbuf/SIZEOF_WCHAR_T);
             } while ((cres==(size_t)-1) && (errno==E2BIG));
         }
-        
+
         if (ICONV_FAILED(cres, inbuf))
             return (size_t)-1;
 
         return res;
     }
-    
+
     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
     {
 #if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
@@ -598,13 +598,13 @@ public:
 #endif
         if (ICONV_FAILED(cres, inbuf))
             return (size_t)-1;
-            
+
         return res;
     }
-    
+
     bool usable()
         { return (m2w != (iconv_t)-1) && (w2m != (iconv_t)-1); }
-  
+
 public:
     iconv_t m2w, w2m;
 };
@@ -614,23 +614,23 @@ public:
 class CP_CharSet : public wxCharacterSet
 {
 public:
-    CP_CharSet(const wxChar*name) 
+    CP_CharSet(const wxChar*name)
         : wxCharacterSet(name), CodePage(CharsetToCodepage(name)) {}
-        
+
     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
     {
-        size_t len = 
+        size_t len =
             MultiByteToWideChar(CodePage, 0, psz, -1, buf, buf ? n : 0);
         return len ? len : (size_t)-1;
     }
-    
+
     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
     {
         size_t len = WideCharToMultiByte(CodePage, 0, psz, -1, buf,
                                          buf ? n : 0, NULL, NULL);
         return len ? len : (size_t)-1;
     }
-    
+
     bool usable()
         { return CodePage != -1; }
 
@@ -644,7 +644,7 @@ class EC_CharSet : public wxCharacterSet
 public:
     // temporarily just use wxEncodingConverter stuff,
     // so that it works while a better implementation is built
-    EC_CharSet(const wxChar*name) : wxCharacterSet(name), 
+    EC_CharSet(const wxChar*name) : wxCharacterSet(name),
                                     enc(wxFONTENCODING_SYSTEM)
     {
         if (name)
@@ -652,15 +652,15 @@ public:
         m2w.Init(enc, wxFONTENCODING_UNICODE);
         w2m.Init(wxFONTENCODING_UNICODE, enc);
     }
-    
+
     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
     {
         size_t inbuf = strlen(psz);
-        if (buf) 
+        if (buf)
             m2w.Convert(psz,buf);
         return inbuf;
     }
-    
+
     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
     {
 #if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
@@ -670,10 +670,10 @@ public:
 #endif
         if (buf)
             w2m.Convert(psz,buf);
-            
+
         return inbuf;
     }
-    
+
     bool usable()
         { return (enc!=wxFONTENCODING_SYSTEM) && (enc!=wxFONTENCODING_DEFAULT); }
 
@@ -698,17 +698,26 @@ static wxCharacterSet *wxGetCharacterSet(const wxChar *name)
 #endif
         }
     }
-    
+
     if (cset && cset->usable()) return cset;
-    if (cset) delete cset;
-    cset = NULL;
+    if (cset)
+    {
+        delete cset;
+        cset = NULL;
+    }
+
 #ifdef __WIN32__
     cset = new CP_CharSet(name); // may take NULL
-    if (cset->usable()) return cset;
-#endif
-    if (cset) delete cset;
+    if (cset->usable())
+        return cset;
+
+    delete cset;
+#endif // __WIN32__
+
     cset = new EC_CharSet(name);
-    if (cset->usable()) return cset;
+    if (cset->usable())
+        return cset;
+
     delete cset;
     wxLogError(_("Unknown encoding '%s'!"), name);
     return NULL;
@@ -716,16 +725,15 @@ static wxCharacterSet *wxGetCharacterSet(const wxChar *name)
 
 wxCSConv::wxCSConv(const wxChar *charset)
 {
-    m_name = (wxChar *) NULL;
+    m_name = (wxChar *)NULL;
     m_cset = (wxCharacterSet *) NULL;
-    m_deferred = TRUE;
     SetName(charset);
 }
 
 wxCSConv::~wxCSConv()
 {
-    if (m_name) free(m_name);
-    if (m_cset) delete m_cset;
+    free(m_name);
+    delete m_cset;
 }
 
 void wxCSConv::SetName(const wxChar *charset)
@@ -741,39 +749,13 @@ void wxCSConv::LoadNow()
 {
     if (m_deferred)
     {
-        if (!m_name)
+        if ( !m_name )
         {
-#ifdef __UNIX__
-#if defined(HAVE_LANGINFO_H) && defined(CODESET)
-            // GNU libc provides current character set this way
-            char *alang = nl_langinfo(CODESET);
-            if (alang)
-            {
-                SetName(wxConvLibc.cMB2WX(alang));
-            }
-            else
-#endif
-            {
-                // if we can't get at the character set directly,
-                // try to see if it's in the environment variables
-                // (in most cases this won't work, but I was out of ideas)
-                wxChar *lang = wxGetenv(wxT("LC_ALL"));
-                wxChar *dot = lang ? wxStrchr(lang, wxT('.')) : (wxChar *)NULL;
-                if (!dot)
-                {
-                    lang = wxGetenv(wxT("LC_CTYPE"));
-                    dot = lang ? wxStrchr(lang, wxT('.')) : (wxChar *)NULL;
-                }
-                if (!dot)
-                {
-                    lang = wxGetenv(wxT("LANG"));
-                    dot = lang ? wxStrchr(lang, wxT('.')) : (wxChar *)NULL;
-                }
-                if (dot)
-                    SetName(dot+1);
-            }
-#endif
+            wxString name = wxLocale::GetSystemEncodingName();
+            if ( !name.empty() )
+                SetName(name);
         }
+
         m_cset = wxGetCharacterSet(m_name);
         m_deferred = FALSE;
     }
@@ -782,26 +764,26 @@ void wxCSConv::LoadNow()
 size_t wxCSConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
     ((wxCSConv *)this)->LoadNow(); // discard constness
-    
+
     if (m_cset)
         return m_cset->MB2WC(buf, psz, n);
 
     // latin-1 (direct)
     size_t len = strlen(psz);
-    
+
     if (buf)
     {
         for (size_t c = 0; c <= len; c++)
             buf[c] = (unsigned char)(psz[c]);
     }
-    
+
     return len;
 }
 
 size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 {
     ((wxCSConv *)this)->LoadNow(); // discard constness
-    
+
     if (m_cset)
         return m_cset->WC2MB(buf, psz, n);
 
@@ -816,26 +798,27 @@ size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         for (size_t c = 0; c <= len; c++)
             buf[c] = (psz[c] > 0xff) ? '?' : psz[c];
     }
-    
+
     return len;
 }
 
 #ifdef HAVE_ICONV_H
+
 class IC_CharSetConverter
 {
 public:
     IC_CharSetConverter(IC_CharSet *from, IC_CharSet *to)
     {
-        cnv = iconv_open(wxConvLibc.cWX2MB(to->cname), 
-                         wxConvLibc.cWX2MB(from->cname)); 
+        cnv = iconv_open(wxConvLibc.cWX2MB(to->cname),
+                         wxConvLibc.cWX2MB(from->cname));
     }
-        
+
     ~IC_CharSetConverter()
-    { 
-        if (cnv != (iconv_t)-1) 
-            iconv_close(cnv); 
+    {
+        if (cnv != (iconv_t)-1)
+            iconv_close(cnv);
     }
-        
+
     size_t Convert(char *buf, const char *psz, size_t n)
     {
         size_t inbuf = strlen(psz);
@@ -845,7 +828,7 @@ public:
 #else
         size_t res = iconv( cnv, &psz, &inbuf, &buf, &outbuf );
 #endif
-        if (res == (size_t)-1) 
+        if (res == (size_t)-1)
             return (size_t)-1;
         return (n - outbuf);
     }
@@ -853,21 +836,22 @@ public:
 public:
     iconv_t cnv;
 };
-#endif
+
+#endif // HAVE_ICONV_H
 
 class EC_CharSetConverter
 {
 public:
     EC_CharSetConverter(EC_CharSet*from,EC_CharSet*to)
         { cnv.Init(from->enc,to->enc); }
-        
+
     size_t Convert(char*buf, const char*psz, size_t n)
     {
         size_t inbuf = strlen(psz);
         if (buf) cnv.Convert(psz,buf);
         return inbuf;
     }
-  
+
 public:
     wxEncodingConverter cnv;
 };
-- 
2.50.0

