document On{Open,Save}Document()

[wxWidgets.git] / src / common / string.cpp

diff --git a/src/common/string.cpp b/src/common/string.cpp
index 003980e556e245cdb48d753158daac1bdcf55d7c..6b6582462259fcedddf1c7f99c4f158dc9339b26 100644 (file)
--- a/src/common/string.cpp
+++ b/src/common/string.cpp
@@ -10,13 +10,6 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-/*
- * About ref counting:
- *  1) all empty strings use g_strEmpty, nRefs = -1 (set in Init())
- *  2) AllocBuffer() sets nRefs to 1, Lock() increments it by one
- *  3) Unlock() decrements nRefs and frees memory if it goes to 0
- */
-

 // ===========================================================================
 // headers, declarations, constants
 // ===========================================================================
 // ===========================================================================
 // headers, declarations, constants
 // ===========================================================================


@@ -30,6 +23,7 @@
 
 #ifndef WX_PRECOMP
     #include "wx/string.h"
 
 #ifndef WX_PRECOMP
     #include "wx/string.h"

+    #include "wx/wxcrtvararg.h"

 #endif
 
 #include <ctype.h>
 #endif
 
 #include <ctype.h>


@@ -41,10 +35,6 @@
 #include <string.h>
 #include <stdlib.h>
 
 #include <string.h>
 #include <stdlib.h>
 

-#ifdef __SALFORDC__
-    #include <clib.h>
-#endif
-

 #include "wx/hashmap.h"
 
 // string handling functions used by wxString:
 #include "wx/hashmap.h"
 
 // string handling functions used by wxString:


@@ -78,11 +68,10 @@ const size_t wxString::npos = (size_t) -1;
 
 wxSTD ostream& operator<<(wxSTD ostream& os, const wxCStrData& str)
 {
 
 wxSTD ostream& operator<<(wxSTD ostream& os, const wxCStrData& str)
 {

-// FIXME-UTF8: always, not only if wxUSE_UNICODE
-#if wxUSE_UNICODE && !defined(__BORLANDC__)
-    return os << str.AsWChar();
+#if wxUSE_UNICODE && !wxUSE_UNICODE_UTF8
+    return os << (const char *)str.AsCharBuf();

 #else
 #else

-    return os << str.AsChar();
+    return os << str.AsInternal();

 #endif
 }
 
 #endif
 }
 


@@ -103,401 +92,32 @@ wxSTD ostream& operator<<(wxSTD ostream& os, const wxWCharBuffer& str)
 }
 #endif
 
 }
 #endif
 

-#endif // wxUSE_STD_IOSTREAM
-
-// ===========================================================================
-// wxString class core
-// ===========================================================================
-
-#if wxUSE_UNICODE_UTF8
-
-// ---------------------------------------------------------------------------
-// UTF-8 operations
-// ---------------------------------------------------------------------------
-
-//
-// Table 3.1B from Unicode spec: Legal UTF-8 Byte Sequences
-//
-//     Code Points    | 1st Byte | 2nd Byte | 3rd Byte | 4th Byte |
-// -------------------+----------+----------+----------+----------+
-//   U+0000..U+007F   |  00..7F  |          |          |          |
-//   U+0080..U+07FF   |  C2..DF  |  80..BF  |          |          |
-//   U+0800..U+0FFF   |  E0      |  A0..BF  |  80..BF  |          |
-//   U+1000..U+FFFF   |  E1..EF  |  80..BF  |  80..BF  |          |
-//  U+10000..U+3FFFF  |  F0      |  90..BF  |  80..BF  |  80..BF  |
-//  U+40000..U+FFFFF  |  F1..F3  |  80..BF  |  80..BF  |  80..BF  |
-// U+100000..U+10FFFF |  F4      |  80..8F  |  80..BF  |  80..BF  |
-// -------------------+----------+----------+----------+----------+
-
-bool wxString::IsValidUtf8String(const char *str)
-{
-    if ( !str )
-        return true; // empty string is UTF8 string
-
-    const unsigned char *c = (const unsigned char*)str;
-
-    for ( ; *c; ++c )
-    {
-        unsigned char b = *c;
-
-        if ( b <= 0x7F ) // 00..7F
-            continue;
-
-        else if ( b < 0xC2 ) // invalid lead bytes: 80..C1
-            return false;
-
-        // two-byte sequences:
-        else if ( b <= 0xDF ) // C2..DF
-        {
-            b = *(++c);
-            if ( !(b >= 0x80 && b <= 0xBF ) )
-                return false;
-        }
-
-        // three-byte sequences:
-        else if ( b == 0xE0 )
-        {
-            b = *(++c);
-            if ( !(b >= 0xA0 && b <= 0xBF ) )
-                return false;
-            b = *(++c);
-            if ( !(b >= 0x80 && b <= 0xBF ) )
-                return false;
-        }
-        else if ( b <= 0xEF ) // E1..EF
-        {
-            for ( int i = 0; i < 2; ++i )
-            {
-                b = *(++c);
-                if ( !(b >= 0x80 && b <= 0xBF ) )
-                    return false;
-            }
-        }
-
-        // four-byte sequences:
-        else if ( b == 0xF0 )
-        {
-            b = *(++c);
-            if ( !(b >= 0x90 && b <= 0xBF ) )
-                return false;
-            for ( int i = 0; i < 2; ++i )
-            {
-                b = *(++c);
-                if ( !(b >= 0x80 && b <= 0xBF ) )
-                    return false;
-            }
-        }
-        else if ( b <= 0xF3 ) // F1..F3
-        {
-            for ( int i = 0; i < 3; ++i )
-            {
-                b = *(++c);
-                if ( !(b >= 0x80 && b <= 0xBF ) )
-                    return false;
-            }
-        }
-        else if ( b == 0xF4 )
-        {
-            b = *(++c);
-            if ( !(b >= 0x80 && b <= 0x8F ) )
-                return false;
-            for ( int i = 0; i < 2; ++i )
-            {
-                b = *(++c);
-                if ( !(b >= 0x80 && b <= 0xBF ) )
-                    return false;
-            }
-        }
-        else // otherwise, it's invalid lead byte
-            return false;
-    }
-
-    return true;
-}
-
-#ifdef __WXDEBUG__
-/* static */
-bool wxString::IsValidUtf8LeadByte(unsigned char c)
-{
-    return (c <= 0x7F) || (c >= 0xC2 && c <= 0xF4);
-}
-#endif
-
-unsigned char wxString::ms_utf8IterTable[256] = {
-    // single-byte sequences (ASCII):
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 00..0F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 10..1F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 20..2F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 30..3F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 40..4F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 50..5F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 60..6F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 70..7F
-
-    // these are invalid, we use step 1 to skip
-    // over them (should never happen):
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 80..8F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 90..9F
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // A0..AF
-    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // B0..BF
-    1, 1,                                            // C0,C1
-
-    // two-byte sequences:
-          2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,  // C2..CF
-    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,  // D0..DF
-
-    // three-byte sequences:
-    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,  // E0..EF
-
-    // four-byte sequences:
-    4, 4, 4, 4, 4,                                   // F0..F4
-
-    // these are invalid again (5- or 6-byte
-    // sequences and sequences for code points
-    // above U+10FFFF, as restricted by RFC 3629):
-                   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1   // F5..FF
-};
+#if wxUSE_UNICODE && defined(HAVE_WOSTREAM)

 
 

-/* static */
-void wxString::DecIter(wxStringImpl::const_iterator& i)
+wxSTD wostream& operator<<(wxSTD wostream& wos, const wxString& str)

 {
 {

-    wxASSERT( IsValidUtf8LeadByte(*i) );
-
-    // Non-lead bytes are all in the 0x80..0xBF range (i.e. 10xxxxxx in
-    // binary), so we just have to go back until we hit a byte that is either
-    // < 0x80 (i.e. 0xxxxxxx in binary) or 0xC0..0xFF (11xxxxxx in binary; this
-    // includes some invalid values, but we can ignore it here, because we
-    // assume valid UTF-8 input for the purpose of efficient implementation).
-    --i;
-    while ( ((*i) & 0xC0) == 0x80 /* 2 highest bits are '10' */ )
-        --i;
+    return wos << str.wc_str();

 }
 
 }
 

-/* static */
-void wxString::DecIter(wxStringImpl::iterator& i)
+wxSTD wostream& operator<<(wxSTD wostream& wos, const wxCStrData& str)

 {
 {

-    // FIXME-UTF8: use template instead
-    wxASSERT( IsValidUtf8LeadByte(*i) );
-    --i;
-    while ( ((*i) & 0xC0) == 0x80 /* 2 highest bits are '10' */ )
-        --i;
+    return wos << str.AsWChar();

 }
 
 }
 

-/* static */
-wxStringImpl::const_iterator
-wxString::AddToIter(wxStringImpl::const_iterator i, int n)
+wxSTD wostream& operator<<(wxSTD wostream& wos, const wxWCharBuffer& str)

 {
 {

-    wxStringImpl::const_iterator out(i);
-
-    if ( n > 0 )
-    {
-        for ( int j = 0; j < n; ++j )
-            IncIter(out);
-    }
-    else if ( n < 0 )
-    {
-        for ( int j = 0; j > n; --j )
-            DecIter(out);
-    }
-
-    return out;
-}
-
-wxStringImpl::iterator
-wxString::AddToIter(wxStringImpl::iterator i, int n)
-{
-    // FIXME-UTF8: use template instead
-    wxStringImpl::iterator out(i);
-
-    if ( n > 0 )
-    {
-        for ( int j = 0; j < n; ++j )
-            IncIter(out);
-    }
-    else if ( n < 0 )
-    {
-        for ( int j = 0; j > n; --j )
-            DecIter(out);
-    }
-
-    return out;
+    return wos << str.data();

 }
 
 }
 

+#endif  // wxUSE_UNICODE && defined(HAVE_WOSTREAM)

 
 

-/* static */
-int wxString::DiffIters(wxStringImpl::const_iterator i1,
-                        wxStringImpl::const_iterator i2)
-{
-    int dist = 0;
-
-    if ( i1 < i2 )
-    {
-        while ( i1 != i2 )
-        {
-            IncIter(i1);
-            dist--;
-        }
-    }
-    else if ( i2 < i1 )
-    {
-        while ( i2 != i1 )
-        {
-            IncIter(i2);
-            dist++;
-        }
-    }
-
-    return dist;
-}
-
-int wxString::DiffIters(wxStringImpl::iterator i1, wxStringImpl::iterator i2)
-{
-    // FIXME-UTF8: use template instead
-    int dist = 0;
-
-    if ( i1 < i2 )
-    {
-        while ( i1 != i2 )
-        {
-            IncIter(i1);
-            dist--;
-        }
-    }
-    else if ( i2 < i1 )
-    {
-        while ( i2 != i1 )
-        {
-            IncIter(i2);
-            dist++;
-        }
-    }
-
-    return dist;
-}
-
-/* static */
-wxString::Utf8CharBuffer wxString::EncodeChar(wxUniChar ch)
-{
-    Utf8CharBuffer buf;
-    char *out = buf.data;
-
-    wxUniChar::value_type code = ch.GetValue();
-
-    //    Char. number range   |        UTF-8 octet sequence
-    //       (hexadecimal)     |              (binary)
-    //   ----------------------+---------------------------------------------
-    //   0000 0000 - 0000 007F | 0xxxxxxx
-    //   0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx
-    //   0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
-    //   0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
-    //
-    //   Code point value is stored in bits marked with 'x', lowest-order bit
-    //   of the value on the right side in the diagram above.
-    //                                                        (from RFC 3629)
-
-    if ( code <= 0x7F )
-    {
-        out[1] = 0;
-        out[0] = (char)code;
-    }
-    else if ( code <= 0x07FF )
-    {
-        out[2] = 0;
-        // NB: this line takes 6 least significant bits, encodes them as
-        // 10xxxxxx and discards them so that the next byte can be encoded:
-        out[1] = 0x80 | (code & 0x3F);  code >>= 6;
-        out[0] = 0xC0 | code;
-    }
-    else if ( code < 0xFFFF )
-    {
-        out[3] = 0;
-        out[2] = 0x80 | (code & 0x3F);  code >>= 6;
-        out[1] = 0x80 | (code & 0x3F);  code >>= 6;
-        out[0] = 0xE0 | code;
-    }
-    else if ( code <= 0x10FFFF )
-    {
-        out[4] = 0;
-        out[3] = 0x80 | (code & 0x3F);  code >>= 6;
-        out[2] = 0x80 | (code & 0x3F);  code >>= 6;
-        out[1] = 0x80 | (code & 0x3F);  code >>= 6;
-        out[0] = 0xF0 | code;
-    }
-    else
-    {
-        wxFAIL_MSG( _T("trying to encode undefined Unicode character") );
-        out[0] = 0;
-    }
-
-    return buf;
-}
-
-/* static */
-wxUniChar wxUniCharRef::DecodeChar(wxStringImpl::const_iterator i)
-{
-    wxASSERT( wxString::IsValidUtf8LeadByte(*i) ); // FIXME-UTF8: no "wxString::"
-
-    wxUniChar::value_type code = 0;
-    size_t len = wxString::GetUtf8CharLength(*i);
-    wxASSERT_MSG( len <= 4, _T("invalid UTF-8 sequence length") );
-
-    //    Char. number range   |        UTF-8 octet sequence
-    //       (hexadecimal)     |              (binary)
-    //   ----------------------+---------------------------------------------
-    //   0000 0000 - 0000 007F | 0xxxxxxx
-    //   0000 0080 - 0000 07FF | 110xxxxx 10xxxxxx
-    //   0000 0800 - 0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
-    //   0001 0000 - 0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
-    //
-    //   Code point value is stored in bits marked with 'x', lowest-order bit
-    //   of the value on the right side in the diagram above.
-    //                                                        (from RFC 3629)
-
-    // mask to extract lead byte's value ('x' bits above), by sequence's length:
-    static const unsigned char s_leadValueMask[4] =  { 0x7F, 0x1F, 0x0F, 0x07 };
-#ifdef __WXDEBUG__
-    // mask and value of lead byte's most significant bits, by length:
-    static const unsigned char s_leadMarkerMask[4] = { 0x80, 0xE0, 0xF0, 0xF8 };
-    static const unsigned char s_leadMarkerVal[4] =  { 0x00, 0xC0, 0xE0, 0xF0 };
-#endif
-
-    // extract the lead byte's value bits:
-    wxASSERT_MSG( ((unsigned char)*i & s_leadMarkerMask[len-1]) ==
-                  s_leadMarkerVal[len-1],
-                  _T("invalid UTF-8 lead byte") );
-    code = (unsigned char)*i & s_leadValueMask[len-1];
-
-    // all remaining bytes, if any, are handled in the same way regardless of
-    // sequence's length:
-    for ( ++i ; len > 1; --len, ++i )
-    {
-        wxASSERT_MSG( ((unsigned char)*i & 0xC0) == 0x80,
-                      _T("invalid UTF-8 byte") );
-
-        code <<= 6;
-        code |= (unsigned char)*i & 0x3F;
-    }
-
-    return wxUniChar(code);
-}
-
-/* static */
-wxCharBuffer wxString::EncodeNChars(size_t n, wxUniChar ch)
-{
-    Utf8CharBuffer once(EncodeChar(ch));
-    // the IncIter() table can be used to determine the length of ch's encoding:
-    size_t len = ms_utf8IterTable[(unsigned char)once.data[0]];
-
-    wxCharBuffer buf(n * len);
-    char *ptr = buf.data();
-    for ( size_t i = 0; i < n; i++, ptr += len )
-    {
-        memcpy(ptr, once.data, len);
-    }
+#endif // wxUSE_STD_IOSTREAM

 
 

-    return buf;
-}
+// ===========================================================================
+// wxString class core
+// ===========================================================================

 
 

+#if wxUSE_UNICODE_UTF8

 
 void wxString::PosLenToImpl(size_t pos, size_t len,
                             size_t *implPos, size_t *implLen) const
 
 void wxString::PosLenToImpl(size_t pos, size_t len,
                             size_t *implPos, size_t *implLen) const


@@ -507,7 +127,7 @@ void wxString::PosLenToImpl(size_t pos, size_t len,
     else
     {
         const_iterator i = begin() + pos;
     else
     {
         const_iterator i = begin() + pos;

-        *implPos = wxStringImpl::const_iterator(i) - m_impl.begin();
+        *implPos = wxStringImpl::const_iterator(i.impl()) - m_impl.begin();

         if ( len == npos )
             *implLen = npos;
         else
         if ( len == npos )
             *implLen = npos;
         else


@@ -518,8 +138,7 @@ void wxString::PosLenToImpl(size_t pos, size_t len,
             if ( pos + len > length() )
                 len = length() - pos;
 
             if ( pos + len > length() )
                 len = length() - pos;
 

-            *implLen = wxStringImpl::const_iterator(i + len) -
-                       wxStringImpl::const_iterator(i);
+            *implLen = (i + len).impl() - i.impl();

         }
     }
 }
         }
     }
 }


@@ -615,15 +234,48 @@ wxString::~wxString()
 }
 #endif
 
 }
 #endif
 

-#if wxUSE_UNICODE
+#if wxUSE_UNICODE && !wxUSE_UTF8_LOCALE_ONLY

 const char* wxCStrData::AsChar() const
 {
 const char* wxCStrData::AsChar() const
 {

+#if wxUSE_UNICODE_UTF8
+    if ( wxLocaleIsUtf8 )
+        return AsInternal();
+#endif
+    // under non-UTF8 locales, we have to convert the internal UTF-8
+    // representation using wxConvLibc and cache the result
+

     wxString *str = wxConstCast(m_str, wxString);
 
     // convert the string:
     wxString *str = wxConstCast(m_str, wxString);
 
     // convert the string:

+    //
+    // FIXME-UTF8: we'd like to do the conversion in the existing buffer (if we
+    //             have it) but it's unfortunately not obvious to implement
+    //             because we don't know how big buffer do we need for the
+    //             given string length (in case of multibyte encodings, e.g.
+    //             ISO-2022-JP or UTF-8 when internal representation is wchar_t)
+    //
+    //             One idea would be to store more than just m_convertedToChar
+    //             in wxString: then we could record the length of the string
+    //             which was converted the last time and try to reuse the same
+    //             buffer if the current length is not greater than it (this
+    //             could still fail because string could have been modified in
+    //             place but it would work most of the time, so we'd do it and
+    //             only allocate the new buffer if in-place conversion returned
+    //             an error). We could also store a bit saying if the string
+    //             was modified since the last conversion (and update it in all
+    //             operation modifying the string, of course) to avoid unneeded
+    //             consequential conversions. But both of these ideas require
+    //             adding more fields to wxString and require profiling results
+    //             to be sure that we really gain enough from them to justify
+    //             doing it.

     wxCharBuffer buf(str->mb_str());
 
     wxCharBuffer buf(str->mb_str());
 

-    // FIXME-UTF8: do the conversion in-place in the existing buffer
+    // if it failed, return empty string and not NULL to avoid crashes in code
+    // written with either wxWidgets 2 wxString or std::string behaviour in
+    // mind: neither of them ever returns NULL and so we shouldn't neither
+    if ( !buf )
+        return "";
+

     if ( str->m_convertedToChar &&
          strlen(buf) == strlen(str->m_convertedToChar) )
     {
     if ( str->m_convertedToChar &&
          strlen(buf) == strlen(str->m_convertedToChar) )
     {


@@ -639,7 +291,7 @@ const char* wxCStrData::AsChar() const
     // and keep it:
     return str->m_convertedToChar + m_offset;
 }
     // and keep it:
     return str->m_convertedToChar + m_offset;
 }

-#endif // wxUSE_UNICODE
+#endif // wxUSE_UNICODE && !wxUSE_UTF8_LOCALE_ONLY

 
 #if !wxUSE_UNICODE_WCHAR
 const wchar_t* wxCStrData::AsWChar() const
 
 #if !wxUSE_UNICODE_WCHAR
 const wchar_t* wxCStrData::AsWChar() const


@@ -649,6 +301,10 @@ const wchar_t* wxCStrData::AsWChar() const
     // convert the string:
     wxWCharBuffer buf(str->wc_str());
 
     // convert the string:
     wxWCharBuffer buf(str->wc_str());
 

+    // notice that here, unlike above in AsChar(), conversion can't fail as our
+    // internal UTF-8 is always well-formed -- or the string was corrupted and
+    // all bets are off anyhow
+

     // FIXME-UTF8: do the conversion in-place in the existing buffer
     if ( str->m_convertedToWChar &&
          wxWcslen(buf) == wxWcslen(str->m_convertedToWChar) )
     // FIXME-UTF8: do the conversion in-place in the existing buffer
     if ( str->m_convertedToWChar &&
          wxWcslen(buf) == wxWcslen(str->m_convertedToWChar) )


@@ -701,14 +357,23 @@ wxString::SubstrBufFromMB wxString::ConvertStr(const char *psz, size_t nLength,
 wxString::SubstrBufFromMB wxString::ConvertStr(const char *psz, size_t nLength,
                                                const wxMBConv& conv)
 {
 wxString::SubstrBufFromMB wxString::ConvertStr(const char *psz, size_t nLength,
                                                const wxMBConv& conv)
 {

-    // FIXME-UTF8: return as-is without copying under UTF8 locale, return
-    //             converted string under other locales - needs wxCharBuffer
-    //             changes
-

     // anything to do?
     if ( !psz || nLength == 0 )
         return SubstrBufFromMB("", 0);
 
     // anything to do?
     if ( !psz || nLength == 0 )
         return SubstrBufFromMB("", 0);
 

+    // if psz is already in UTF-8, we don't have to do the roundtrip to
+    // wchar_t* and back:
+    if ( conv.IsUTF8() )
+    {
+        // we need to validate the input because UTF8 iterators assume valid
+        // UTF-8 sequence and psz may be invalid:
+        if ( wxStringOperations::IsValidUtf8String(psz, nLength) )
+        {
+            return SubstrBufFromMB(wxCharBuffer::CreateNonOwned(psz), nLength);
+        }
+        // else: do the roundtrip through wchar_t*
+    }
+

     if ( nLength == npos )
         nLength = wxNO_LEN;
 
     if ( nLength == npos )
         nLength = wxNO_LEN;
 


@@ -719,7 +384,7 @@ wxString::SubstrBufFromMB wxString::ConvertStr(const char *psz, size_t nLength,
         return SubstrBufFromMB("", 0);
 
     // and then to UTF-8:
         return SubstrBufFromMB("", 0);
 
     // and then to UTF-8:

-    SubstrBufFromMB buf(ConvertStr(wcBuf, wcLen, wxConvUTF8));
+    SubstrBufFromMB buf(ConvertStr(wcBuf, wcLen, wxMBConvStrictUTF8()));

     // widechar -> UTF-8 conversion isn't supposed to ever fail:
     wxASSERT_MSG( buf.data, _T("conversion to UTF-8 failed") );
 
     // widechar -> UTF-8 conversion isn't supposed to ever fail:
     wxASSERT_MSG( buf.data, _T("conversion to UTF-8 failed") );
 


@@ -761,26 +426,32 @@ const wxCharBuffer wxString::mb_str(const wxMBConv& conv) const
 
 const wxWCharBuffer wxString::wc_str() const
 {
 
 const wxWCharBuffer wxString::wc_str() const
 {

-    return wxConvUTF8.cMB2WC(m_impl.c_str(),
-                             m_impl.length() + 1 /* size, not length */,
-                             NULL);
+    return wxMBConvStrictUTF8().cMB2WC
+                                (
+                                    m_impl.c_str(),
+                                    m_impl.length() + 1, // size, not length
+                                    NULL
+                                );

 }
 
 const wxCharBuffer wxString::mb_str(const wxMBConv& conv) const
 {
 }
 
 const wxCharBuffer wxString::mb_str(const wxMBConv& conv) const
 {

-    // FIXME-UTF8: optimize the case when conv==wxConvUTF8 or wxConvLibc
-    //             under UTF8 locale
+    if ( conv.IsUTF8() )
+        return wxCharBuffer::CreateNonOwned(m_impl.c_str());
+

     // FIXME-UTF8: use wc_str() here once we have buffers with length
 
     size_t wcLen;
     // FIXME-UTF8: use wc_str() here once we have buffers with length
 
     size_t wcLen;

-    wxWCharBuffer wcBuf(
-            wxConvUTF8.cMB2WC(m_impl.c_str(),
-                              m_impl.length() + 1 /* size, not length */,
-                              &wcLen));
+    wxWCharBuffer wcBuf(wxMBConvStrictUTF8().cMB2WC
+                                             (
+                                                m_impl.c_str(),
+                                                m_impl.length() + 1, // size
+                                                &wcLen
+                                             ));

     if ( !wcLen )
         return wxCharBuffer("");
 
     if ( !wcLen )
         return wxCharBuffer("");
 

-    return conv.cWC2MB(wcBuf, wcLen, NULL);
+    return conv.cWC2MB(wcBuf, wcLen+1, NULL);

 }
 
 #else // ANSI
 }
 
 #else // ANSI


@@ -804,7 +475,7 @@ bool wxString::Shrink()
 
 // deprecated compatibility code:
 #if WXWIN_COMPATIBILITY_2_8 && !wxUSE_STL_BASED_WXSTRING && !wxUSE_UNICODE_UTF8
 
 // deprecated compatibility code:
 #if WXWIN_COMPATIBILITY_2_8 && !wxUSE_STL_BASED_WXSTRING && !wxUSE_UNICODE_UTF8

-wxChar *wxString::GetWriteBuf(size_t nLen)
+wxStringCharType *wxString::GetWriteBuf(size_t nLen)

 {
     return DoGetWriteBuf(nLen);
 }
 {
     return DoGetWriteBuf(nLen);
 }


@@ -943,6 +614,12 @@ wxString operator+(const wchar_t *pwz, const wxString& str)
 // string comparison
 // ---------------------------------------------------------------------------
 
 // string comparison
 // ---------------------------------------------------------------------------
 

+bool wxString::IsSameAs(wxUniChar c, bool compareWithCase) const
+{
+    return (length() == 1) && (compareWithCase ? GetChar(0u) == c
+                               : wxToupper(GetChar(0u)) == wxToupper(c));
+}
+

 #ifdef HAVE_STD_STRING_COMPARE
 
 // NB: Comparison code (both if HAVE_STD_STRING_COMPARE and if not) works with
 #ifdef HAVE_STD_STRING_COMPARE
 
 // NB: Comparison code (both if HAVE_STD_STRING_COMPARE and if not) works with


@@ -1312,13 +989,12 @@ int wxString::CmpNoCase(const wxString& s) const
 {
     // FIXME-UTF8: use wxUniChar::ToLower/ToUpper once added
 
 {
     // FIXME-UTF8: use wxUniChar::ToLower/ToUpper once added
 

-    size_t idx = 0;

     const_iterator i1 = begin();
     const_iterator end1 = end();
     const_iterator i2 = s.begin();
     const_iterator end2 = s.end();
 
     const_iterator i1 = begin();
     const_iterator end1 = end();
     const_iterator i2 = s.begin();
     const_iterator end2 = s.end();
 

-    for ( ; i1 != end1 && i2 != end2; ++idx, ++i1, ++i2 )
+    for ( ; i1 != end1 && i2 != end2; ++i1, ++i2 )

     {
         wxUniChar lower1 = (wxChar)wxTolower(*i1);
         wxUniChar lower2 = (wxChar)wxTolower(*i2);
     {
         wxUniChar lower1 = (wxChar)wxTolower(*i1);
         wxUniChar lower2 = (wxChar)wxTolower(*i2);


@@ -1345,63 +1021,69 @@ int wxString::CmpNoCase(const wxString& s) const
 #endif
 #endif
 
 #endif
 #endif
 

-wxString wxString::FromAscii(const char *ascii)
+wxString wxString::FromAscii(const char *ascii, size_t len)

 {
 {

-    if (!ascii)
+    if (!ascii || len == 0)

        return wxEmptyString;
 
        return wxEmptyString;
 

-    size_t len = strlen( ascii );

     wxString res;
 
     wxString res;
 

-    if ( len )

     {
     {

-        wxStringBuffer buf(res, len);
+        wxStringInternalBuffer buf(res, len);
+        wxStringCharType *dest = buf;

 
 

-        wchar_t *dest = buf;
-
-        for ( ;; )
+        for ( ; len > 0; --len )

         {
         {

-           if ( (*dest++ = (wchar_t)(unsigned char)*ascii++) == L'\0' )
-               break;
+            unsigned char c = (unsigned char)*ascii++;
+            wxASSERT_MSG( c < 0x80,
+                          _T("Non-ASCII value passed to FromAscii().") );
+
+            *dest++ = (wchar_t)c;

         }
     }
 
     return res;
 }
 
         }
     }
 
     return res;
 }
 

-wxString wxString::FromAscii(const char ascii)
+wxString wxString::FromAscii(const char *ascii)
+{
+    return FromAscii(ascii, wxStrlen(ascii));
+}
+
+wxString wxString::FromAscii(char ascii)

 {
     // What do we do with '\0' ?
 
 {
     // What do we do with '\0' ?
 

-    wxString res;
-    res += (wchar_t)(unsigned char) ascii;
+    unsigned char c = (unsigned char)ascii;

 
 

-    return res;
+    wxASSERT_MSG( c < 0x80, _T("Non-ASCII value passed to FromAscii().") );
+
+    // NB: the cast to wchar_t causes interpretation of 'ascii' as Latin1 value
+    return wxString(wxUniChar((wchar_t)c));

 }
 
 const wxCharBuffer wxString::ToAscii() const
 {
     // this will allocate enough space for the terminating NUL too
     wxCharBuffer buffer(length());
 }
 
 const wxCharBuffer wxString::ToAscii() const
 {
     // this will allocate enough space for the terminating NUL too
     wxCharBuffer buffer(length());

-
-

     char *dest = buffer.data();
 
     char *dest = buffer.data();
 

-    const wchar_t *pwc = c_str();
-    for ( ;; )
+    for ( const_iterator i = begin(); i != end(); ++i )

     {
     {

-        *dest++ = (char)(*pwc > SCHAR_MAX ? wxT('_') : *pwc);
+        wxUniChar c(*i);
+        // FIXME-UTF8: unify substituted char ('_') with wxUniChar ('?')
+        *dest++ = c.IsAscii() ? (char)c : '_';

 
         // the output string can't have embedded NULs anyhow, so we can safely
         // stop at first of them even if we do have any
 
         // the output string can't have embedded NULs anyhow, so we can safely
         // stop at first of them even if we do have any

-        if ( !*pwc++ )
+        if ( !c )

             break;
     }
 
     return buffer;
 }
 
             break;
     }
 
     return buffer;
 }
 

-#endif // Unicode
+#endif // wxUSE_UNICODE

 
 // extract string of length nCount starting at nFirst
 wxString wxString::Mid(size_t nFirst, size_t nCount) const
 
 // extract string of length nCount starting at nFirst
 wxString wxString::Mid(size_t nFirst, size_t nCount) const


@@ -1437,28 +1119,15 @@ wxString wxString::Mid(size_t nFirst, size_t nCount) const
 
 // check that the string starts with prefix and return the rest of the string
 // in the provided pointer if it is not NULL, otherwise return false
 
 // check that the string starts with prefix and return the rest of the string
 // in the provided pointer if it is not NULL, otherwise return false

-bool wxString::StartsWith(const wxChar *prefix, wxString *rest) const
+bool wxString::StartsWith(const wxString& prefix, wxString *rest) const

 {
 {

-    wxASSERT_MSG( prefix, _T("invalid parameter in wxString::StartsWith") );
-
-    // first check if the beginning of the string matches the prefix: note
-    // that we don't have to check that we don't run out of this string as
-    // when we reach the terminating NUL, either prefix string ends too (and
-    // then it's ok) or we break out of the loop because there is no match
-    const wxChar *p = c_str();
-    while ( *prefix )
-    {
-        if ( *prefix++ != *p++ )
-        {
-            // no match
-            return false;
-        }
-    }
+    if ( compare(0, prefix.length(), prefix) != 0 )
+        return false;

 
     if ( rest )
     {
         // put the rest of the string into provided pointer
 
     if ( rest )
     {
         // put the rest of the string into provided pointer

-        *rest = p;
+        rest->assign(*this, prefix.length(), npos);

     }
 
     return true;
     }
 
     return true;


@@ -1467,11 +1136,9 @@ bool wxString::StartsWith(const wxChar *prefix, wxString *rest) const
 
 // check that the string ends with suffix and return the rest of it in the
 // provided pointer if it is not NULL, otherwise return false
 
 // check that the string ends with suffix and return the rest of it in the
 // provided pointer if it is not NULL, otherwise return false

-bool wxString::EndsWith(const wxChar *suffix, wxString *rest) const
+bool wxString::EndsWith(const wxString& suffix, wxString *rest) const

 {
 {

-    wxASSERT_MSG( suffix, _T("invalid parameter in wxString::EndssWith") );
-
-    int start = length() - wxStrlen(suffix);
+    int start = length() - suffix.length();

 
     if ( start < 0 || compare(start, npos, suffix) != 0 )
         return false;
 
     if ( start < 0 || compare(start, npos, suffix) != 0 )
         return false;


@@ -1604,34 +1271,43 @@ size_t wxString::Replace(const wxString& strOld,
 
 bool wxString::IsAscii() const
 {
 
 bool wxString::IsAscii() const
 {

-  const wxChar *s = (const wxChar*) *this;
-  while(*s){
-    if(!isascii(*s)) return(false);
-    s++;
-  }
-  return(true);
+    for ( const_iterator i = begin(); i != end(); ++i )
+    {
+        if ( !(*i).IsAscii() )
+            return false;
+    }
+
+    return true;

 }
 
 bool wxString::IsWord() const
 {
 }
 
 bool wxString::IsWord() const
 {

-  const wxChar *s = (const wxChar*) *this;
-  while(*s){
-    if(!wxIsalpha(*s)) return(false);
-    s++;
-  }
-  return(true);
+    for ( const_iterator i = begin(); i != end(); ++i )
+    {
+        if ( !wxIsalpha(*i) )
+            return false;
+    }
+
+    return true;

 }
 
 bool wxString::IsNumber() const
 {
 }
 
 bool wxString::IsNumber() const
 {

-  const wxChar *s = (const wxChar*) *this;
-  if (wxStrlen(s))
-     if ((s[0] == wxT('-')) || (s[0] == wxT('+'))) s++;
-  while(*s){
-    if(!wxIsdigit(*s)) return(false);
-    s++;
-  }
-  return(true);
+    if ( empty() )
+        return true;
+
+    const_iterator i = begin();
+
+    if ( *i == _T('-') || *i == _T('+') )
+        ++i;
+
+    for ( ; i != end(); ++i )
+    {
+        if ( !wxIsdigit(*i) )
+            return false;
+    }
+
+    return true;

 }
 
 wxString wxString::Strip(stripType w) const
 }
 
 wxString wxString::Strip(stripType w) const


@@ -1667,9 +1343,9 @@ wxString& wxString::MakeLower()
 // ---------------------------------------------------------------------------
 
 // some compilers (VC++ 6.0 not to name them) return true for a call to
 // ---------------------------------------------------------------------------
 
 // some compilers (VC++ 6.0 not to name them) return true for a call to

-// isspace('ê') in the C locale which seems to be broken to me, but we have to
-// live with this by checking that the character is a 7 bit one - even if this
-// may fail to detect some spaces (I don't know if Unicode doesn't have
+// isspace('\xEA') in the C locale which seems to be broken to me, but we have
+// to live with this by checking that the character is a 7 bit one - even if
+// this may fail to detect some spaces (I don't know if Unicode doesn't have

 // space-like symbols somewhere except in the first 128 chars), it is arguably
 // still better than trimming away accented letters
 inline int wxSafeIsspace(wxChar ch) { return (ch < 127) && wxIsspace(ch); }
 // space-like symbols somewhere except in the first 128 chars), it is arguably
 // still better than trimming away accented letters
 inline int wxSafeIsspace(wxChar ch) { return (ch < 127) && wxIsspace(ch); }


@@ -1690,7 +1366,7 @@ wxString& wxString::Trim(bool bFromRight)
             // find last non-space character
             reverse_iterator psz = rbegin();
             while ( (psz != rend()) && wxSafeIsspace(*psz) )
             // find last non-space character
             reverse_iterator psz = rbegin();
             while ( (psz != rend()) && wxSafeIsspace(*psz) )

-                psz++;
+                ++psz;

 
             // truncate at trailing space start
             erase(psz.base(), end());
 
             // truncate at trailing space start
             erase(psz.base(), end());


@@ -1700,7 +1376,7 @@ wxString& wxString::Trim(bool bFromRight)
             // find first non-space character
             iterator psz = begin();
             while ( (psz != end()) && wxSafeIsspace(*psz) )
             // find first non-space character
             iterator psz = begin();
             while ( (psz != end()) && wxSafeIsspace(*psz) )

-                psz++;
+                ++psz;

 
             // fix up data and length
             erase(begin(), psz);
 
             // fix up data and length
             erase(begin(), psz);


@@ -1754,84 +1430,84 @@ int wxString::Find(wxUniChar ch, bool bFromEnd) const
 // conversion to numbers
 // ----------------------------------------------------------------------------
 
 // conversion to numbers
 // ----------------------------------------------------------------------------
 

-// the implementation of all the functions below is exactly the same so factor
-// it out
-
-template <typename T, typename F>
-bool wxStringToIntType(const wxChar *start,
-                       T *val,
-                       int base,
-                       F func)
-{
-    wxCHECK_MSG( val, false, _T("NULL output pointer") );
-    wxASSERT_MSG( !base || (base > 1 && base <= 36), _T("invalid base") );
+// The implementation of all the functions below is exactly the same so factor
+// it out. Note that number extraction works correctly on UTF-8 strings, so
+// we can use wxStringCharType and wx_str() for maximum efficiency.

 
 #ifndef __WXWINCE__
 
 #ifndef __WXWINCE__

-    errno = 0;
+    #define DO_IF_NOT_WINCE(x) x
+#else
+    #define DO_IF_NOT_WINCE(x)

 #endif
 
 #endif
 

-    wxChar *end;
-    *val = (*func)(start, &end, base);
-
-    // return true only if scan was stopped by the terminating NUL and if the
-    // string was not empty to start with and no under/overflow occurred
-    return !*end && (end != start)
-#ifndef __WXWINCE__
-        && (errno != ERANGE)
-#endif
-    ;
-}
+#define WX_STRING_TO_INT_TYPE(out, base, func, T)                           \
+    wxCHECK_MSG( out, false, _T("NULL output pointer") );                   \
+    wxASSERT_MSG( !base || (base > 1 && base <= 36), _T("invalid base") );  \
+                                                                            \
+    DO_IF_NOT_WINCE( errno = 0; )                                           \
+                                                                            \
+    const wxStringCharType *start = wx_str();                               \
+    wxStringCharType *end;                                                  \
+    T val = func(start, &end, base);                                        \
+                                                                            \
+    /* return true only if scan was stopped by the terminating NUL and */   \
+    /* if the string was not empty to start with and no under/overflow */   \
+    /* occurred: */                                                         \
+    if ( *end || end == start DO_IF_NOT_WINCE(|| errno == ERANGE) )         \
+        return false;                                                       \
+    *out = val;                                                             \
+    return true

 
 

-bool wxString::ToLong(long *val, int base) const
+bool wxString::ToLong(long *pVal, int base) const

 {
 {

-    return wxStringToIntType((const wxChar*)c_str(), val, base, wxStrtol);
+    WX_STRING_TO_INT_TYPE(pVal, base, wxStrtol, long);

 }
 
 }
 

-bool wxString::ToULong(unsigned long *val, int base) const
+bool wxString::ToULong(unsigned long *pVal, int base) const

 {
 {

-    return wxStringToIntType((const wxChar*)c_str(), val, base, wxStrtoul);
+    WX_STRING_TO_INT_TYPE(pVal, base, wxStrtoul, unsigned long);

 }
 
 }
 

-bool wxString::ToLongLong(wxLongLong_t *val, int base) const
+bool wxString::ToLongLong(wxLongLong_t *pVal, int base) const

 {
 {

-    return wxStringToIntType((const wxChar*)c_str(), val, base, wxStrtoll);
+    WX_STRING_TO_INT_TYPE(pVal, base, wxStrtoll, wxLongLong_t);

 }
 
 }
 

-bool wxString::ToULongLong(wxULongLong_t *val, int base) const
+bool wxString::ToULongLong(wxULongLong_t *pVal, int base) const

 {
 {

-    return wxStringToIntType((const wxChar*)c_str(), val, base, wxStrtoull);
+    WX_STRING_TO_INT_TYPE(pVal, base, wxStrtoull, wxULongLong_t);

 }
 
 }
 

-bool wxString::ToDouble(double *val) const
+bool wxString::ToDouble(double *pVal) const

 {
 {

-    wxCHECK_MSG( val, false, _T("NULL pointer in wxString::ToDouble") );
+    wxCHECK_MSG( pVal, false, _T("NULL output pointer") );

 
 

-#ifndef __WXWINCE__
-    errno = 0;
-#endif
+    DO_IF_NOT_WINCE( errno = 0; )

 
     const wxChar *start = c_str();
     wxChar *end;
 
     const wxChar *start = c_str();
     wxChar *end;

-    *val = wxStrtod(start, &end);
+    double val = wxStrtod(start, &end);

 
     // return true only if scan was stopped by the terminating NUL and if the
     // string was not empty to start with and no under/overflow occurred
 
     // return true only if scan was stopped by the terminating NUL and if the
     // string was not empty to start with and no under/overflow occurred

-    return !*end && (end != start)
-#ifndef __WXWINCE__
-        && (errno != ERANGE)
-#endif
-    ;
+    if ( *end || end == start DO_IF_NOT_WINCE(|| errno == ERANGE) )
+        return false;
+
+    *pVal = val;
+
+    return true;

 }
 
 // ---------------------------------------------------------------------------
 // formatted output
 // ---------------------------------------------------------------------------
 
 }
 
 // ---------------------------------------------------------------------------
 // formatted output
 // ---------------------------------------------------------------------------
 

+#if !wxUSE_UTF8_LOCALE_ONLY

 /* static */
 #ifdef wxNEEDS_WXSTRING_PRINTF_MIXIN
 /* static */
 #ifdef wxNEEDS_WXSTRING_PRINTF_MIXIN

-wxString wxStringPrintfMixinBase::DoFormat(const wxChar *format, ...)
+wxString wxStringPrintfMixinBase::DoFormatWchar(const wxChar *format, ...)

 #else
 #else

-wxString wxString::DoFormat(const wxChar *format, ...)
+wxString wxString::DoFormatWchar(const wxChar *format, ...)

 #endif
 {
     va_list argptr;
 #endif
 {
     va_list argptr;


@@ -1844,6 +1520,23 @@ wxString wxString::DoFormat(const wxChar *format, ...)
 
     return s;
 }
 
     return s;
 }

+#endif // !wxUSE_UTF8_LOCALE_ONLY
+
+#if wxUSE_UNICODE_UTF8
+/* static */
+wxString wxString::DoFormatUtf8(const char *format, ...)
+{
+    va_list argptr;
+    va_start(argptr, format);
+
+    wxString s;
+    s.PrintfV(format, argptr);
+
+    va_end(argptr);
+
+    return s;
+}
+#endif // wxUSE_UNICODE_UTF8

 
 /* static */
 wxString wxString::FormatV(const wxString& format, va_list argptr)
 
 /* static */
 wxString wxString::FormatV(const wxString& format, va_list argptr)


@@ -1853,10 +1546,11 @@ wxString wxString::FormatV(const wxString& format, va_list argptr)
     return s;
 }
 
     return s;
 }
 

+#if !wxUSE_UTF8_LOCALE_ONLY

 #ifdef wxNEEDS_WXSTRING_PRINTF_MIXIN
 #ifdef wxNEEDS_WXSTRING_PRINTF_MIXIN

-int wxStringPrintfMixinBase::DoPrintf(const wxChar *format, ...)
+int wxStringPrintfMixinBase::DoPrintfWchar(const wxChar *format, ...)

 #else
 #else

-int wxString::DoPrintf(const wxChar *format, ...)
+int wxString::DoPrintfWchar(const wxChar *format, ...)

 #endif
 {
     va_list argptr;
 #endif
 {
     va_list argptr;


@@ -1877,19 +1571,106 @@ int wxString::DoPrintf(const wxChar *format, ...)
 
     return iLen;
 }
 
     return iLen;
 }

+#endif // !wxUSE_UTF8_LOCALE_ONLY

 
 

-int wxString::PrintfV(const wxString& format, va_list argptr)
+#if wxUSE_UNICODE_UTF8
+int wxString::DoPrintfUtf8(const char *format, ...)
+{
+    va_list argptr;
+    va_start(argptr, format);
+
+    int iLen = PrintfV(format, argptr);
+
+    va_end(argptr);
+
+    return iLen;
+}
+#endif // wxUSE_UNICODE_UTF8
+
+/*
+    Uses wxVsnprintf and places the result into the this string.
+
+    In ANSI build, wxVsnprintf is effectively vsnprintf but in Unicode build
+    it is vswprintf.  Due to a discrepancy between vsnprintf and vswprintf in
+    the ISO C99 (and thus SUSv3) standard the return value for the case of
+    an undersized buffer is inconsistent.  For conforming vsnprintf
+    implementations the function must return the number of characters that
+    would have been printed had the buffer been large enough.  For conforming
+    vswprintf implementations the function must return a negative number
+    and set errno.
+
+    What vswprintf sets errno to is undefined but Darwin seems to set it to
+    EOVERFLOW.  The only expected errno are EILSEQ and EINVAL.  Both of
+    those are defined in the standard and backed up by several conformance
+    statements.  Note that ENOMEM mentioned in the manual page does not
+    apply to swprintf, only wprintf and fwprintf.
+
+    Official manual page:
+    http://www.opengroup.org/onlinepubs/009695399/functions/swprintf.html
+
+    Some conformance statements (AIX, Solaris):
+    http://www.opengroup.org/csq/view.mhtml?RID=ibm%2FSD1%2F3
+    http://www.theopengroup.org/csq/view.mhtml?norationale=1&noreferences=1&RID=Fujitsu%2FSE2%2F10
+
+    Since EILSEQ and EINVAL are rather common but EOVERFLOW is not and since
+    EILSEQ and EINVAL are specifically defined to mean the error is other than
+    an undersized buffer and no other errno are defined we treat those two
+    as meaning hard errors and everything else gets the old behavior which
+    is to keep looping and increasing buffer size until the function succeeds.
+
+    In practice it's impossible to determine before compilation which behavior
+    may be used.  The vswprintf function may have vsnprintf-like behavior or
+    vice-versa.  Behavior detected on one release can theoretically change
+    with an updated release.  Not to mention that configure testing for it
+    would require the test to be run on the host system, not the build system
+    which makes cross compilation difficult. Therefore, we make no assumptions
+    about behavior and try our best to handle every known case, including the
+    case where wxVsnprintf returns a negative number and fails to set errno.
+
+    There is yet one more non-standard implementation and that is our own.
+    Fortunately, that can be detected at compile-time.
+
+    On top of all that, ISO C99 explicitly defines snprintf to write a null
+    character to the last position of the specified buffer.  That would be at
+    at the given buffer size minus 1.  It is supposed to do this even if it
+    turns out that the buffer is sized too small.
+
+    Darwin (tested on 10.5) follows the C99 behavior exactly.
+
+    Glibc 2.6 almost follows the C99 behavior except vswprintf never sets
+    errno even when it fails.  However, it only seems to ever fail due
+    to an undersized buffer.
+*/
+#if wxUSE_UNICODE_UTF8
+template<typename BufferType>
+#else
+// we only need one version in non-UTF8 builds and at least two Windows
+// compilers have problems with this function template, so use just one
+// normal function here
+#endif
+static int DoStringPrintfV(wxString& str,
+                           const wxString& format, va_list argptr)

 {
     int size = 1024;
 
     for ( ;; )
     {
 {
     int size = 1024;
 
     for ( ;; )
     {

-        wxStringBuffer tmp(*this, size + 1);
+#if wxUSE_UNICODE_UTF8
+        BufferType tmp(str, size + 1);
+        typename BufferType::CharType *buf = tmp;
+#else
+        wxStringBuffer tmp(str, size + 1);

         wxChar *buf = tmp;
         wxChar *buf = tmp;

+#endif

 
         if ( !buf )
         {
             // out of memory
 
         if ( !buf )
         {
             // out of memory

+
+            // in UTF-8 build, leaving uninitialized junk in the buffer
+            // could result in invalid non-empty UTF-8 string, so just
+            // reset the string to empty on failure:
+            buf[0] = '\0';

             return -1;
         }
 
             return -1;
         }
 


@@ -1897,12 +1678,19 @@ int wxString::PrintfV(const wxString& format, va_list argptr)
         // only a copy
         va_list argptrcopy;
         wxVaCopy(argptrcopy, argptr);
         // only a copy
         va_list argptrcopy;
         wxVaCopy(argptrcopy, argptr);

-        int len = wxVsnprintf(buf, size, (const wxChar*)/*FIXME-UTF8*/format, argptrcopy);
+
+#ifndef __WXWINCE__
+        // Set errno to 0 to make it determinate if wxVsnprintf fails to set it.
+        errno = 0;
+#endif
+        int len = wxVsnprintf(buf, size, format, argptrcopy);

         va_end(argptrcopy);
 
         // some implementations of vsnprintf() don't NUL terminate
         // the string if there is not enough space for it so
         // always do it manually
         va_end(argptrcopy);
 
         // some implementations of vsnprintf() don't NUL terminate
         // the string if there is not enough space for it so
         // always do it manually

+        // FIXME: This really seems to be the wrong and would be an off-by-one
+        // bug except the code above allocates an extra character.

         buf[size] = _T('\0');
 
         // vsnprintf() may return either -1 (traditional Unix behaviour) or the
         buf[size] = _T('\0');
 
         // vsnprintf() may return either -1 (traditional Unix behaviour) or the


@@ -1910,27 +1698,47 @@ int wxString::PrintfV(const wxString& format, va_list argptr)
         // buffer were large enough (newer standards such as Unix98)
         if ( len < 0 )
         {
         // buffer were large enough (newer standards such as Unix98)
         if ( len < 0 )
         {

+            // NB: wxVsnprintf() may call either wxCRT_VsnprintfW or
+            //     wxCRT_VsnprintfA in UTF-8 build; wxUSE_WXVSNPRINTF
+            //     is true if *both* of them use our own implementation,
+            //     otherwise we can't be sure

 #if wxUSE_WXVSNPRINTF
             // we know that our own implementation of wxVsnprintf() returns -1
             // only for a format error - thus there's something wrong with
             // the user's format string
 #if wxUSE_WXVSNPRINTF
             // we know that our own implementation of wxVsnprintf() returns -1
             // only for a format error - thus there's something wrong with
             // the user's format string

+            buf[0] = '\0';

             return -1;
             return -1;

-#else // assume that system version only returns error if not enough space
+#else // possibly using system version
+            // assume it only returns error if there is not enough space, but
+            // as we don't know how much we need, double the current size of
+            // the buffer
+#ifndef __WXWINCE__
+            if( (errno == EILSEQ) || (errno == EINVAL) )
+            // If errno was set to one of the two well-known hard errors
+            // then fail immediately to avoid an infinite loop.
+                return -1;
+            else
+#endif // __WXWINCE__

             // still not enough, as we don't know how much we need, double the
             // current size of the buffer
             // still not enough, as we don't know how much we need, double the
             // current size of the buffer

-            size *= 2;
+                size *= 2;

 #endif // wxUSE_WXVSNPRINTF/!wxUSE_WXVSNPRINTF
         }
         else if ( len >= size )
         {
 #if wxUSE_WXVSNPRINTF
 #endif // wxUSE_WXVSNPRINTF/!wxUSE_WXVSNPRINTF
         }
         else if ( len >= size )
         {
 #if wxUSE_WXVSNPRINTF

-            // we know that our own implementation of wxVsnprintf() returns 
+            // we know that our own implementation of wxVsnprintf() returns

             // size+1 when there's not enough space but that's not the size
             // of the required buffer!
             size *= 2;      // so we just double the current size of the buffer
 #else
             // some vsnprintf() implementations NUL-terminate the buffer and
             // some don't in len == size case, to be safe always add 1
             // size+1 when there's not enough space but that's not the size
             // of the required buffer!
             size *= 2;      // so we just double the current size of the buffer
 #else
             // some vsnprintf() implementations NUL-terminate the buffer and
             // some don't in len == size case, to be safe always add 1

+            // FIXME: I don't quite understand this comment.  The vsnprintf
+            // function is specifically defined to return the number of
+            // characters printed not including the null terminator.
+            // So OF COURSE you need to add 1 to get the right buffer size.
+            // The following line is definitely correct, no question.

             size = len + 1;
 #endif
         }
             size = len + 1;
 #endif
         }


@@ -1941,9 +1749,34 @@ int wxString::PrintfV(const wxString& format, va_list argptr)
     }
 
     // we could have overshot
     }
 
     // we could have overshot

-    Shrink();
+    str.Shrink();
+
+    return str.length();
+}
+
+int wxString::PrintfV(const wxString& format, va_list argptr)
+{
+#if wxUSE_UNICODE_UTF8
+    #if wxUSE_STL_BASED_WXSTRING
+        typedef wxStringTypeBuffer<char> Utf8Buffer;
+    #else
+        typedef wxStringInternalBuffer Utf8Buffer;
+    #endif
+#endif

 
 

-    return length();
+#if wxUSE_UTF8_LOCALE_ONLY
+    return DoStringPrintfV<Utf8Buffer>(*this, format, argptr);
+#else
+    #if wxUSE_UNICODE_UTF8
+    if ( wxLocaleIsUtf8 )
+        return DoStringPrintfV<Utf8Buffer>(*this, format, argptr);
+    else
+        // wxChar* version
+        return DoStringPrintfV<wxStringBuffer>(*this, format, argptr);
+    #else
+        return DoStringPrintfV(*this, format, argptr);
+    #endif // UTF8/WCHAR
+#endif

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -2115,3 +1948,32 @@ wxString wxString::Upper() const
 
 // convert to lower case, return the copy of the string
 wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }
 
 // convert to lower case, return the copy of the string
 wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }

+
+// ----------------------------------------------------------------------------
+// wxUTF8StringBuffer
+// ----------------------------------------------------------------------------
+
+#if wxUSE_UNICODE_WCHAR
+wxUTF8StringBuffer::~wxUTF8StringBuffer()
+{
+    wxMBConvStrictUTF8 conv;
+    size_t wlen = conv.ToWChar(NULL, 0, m_buf);
+    wxCHECK_RET( wlen != wxCONV_FAILED, "invalid UTF-8 data in string buffer?" );
+
+    wxStringInternalBuffer wbuf(m_str, wlen);
+    conv.ToWChar(wbuf, wlen, m_buf);
+}
+
+wxUTF8StringBufferLength::~wxUTF8StringBufferLength()
+{
+    wxCHECK_RET(m_lenSet, "length not set");
+
+    wxMBConvStrictUTF8 conv;
+    size_t wlen = conv.ToWChar(NULL, 0, m_buf, m_len);
+    wxCHECK_RET( wlen != wxCONV_FAILED, "invalid UTF-8 data in string buffer?" );
+
+    wxStringInternalBufferLength wbuf(m_str, wlen);
+    conv.ToWChar(wbuf, wlen, m_buf, m_len);
+    wbuf.SetLength(wlen);
+}
+#endif // wxUSE_UNICODE_WCHAR