fixed: FileLog didn't save an utf8 sequence

git-svn-id: svn://ttmath.org/publicrep/pikotools/trunk@1155 e52654a7-88a9-db11-a3e9-0013d4bc506e

log/filelog.cpp

@@ -103,20 +103,21 @@ void FileLog::open_file()
 void FileLog::PutBuffer(PT::WTextStream * buffer, std::ostream & out_stream)
 {
 	char utf8_buffer[256];
+	std::size_t buffer_len = sizeof(utf8_buffer) / sizeof(char);
+	std::size_t utf8_sequence_max_length = 10;
 	std::size_t index = 0;
 
 	PT::WTextStream::const_iterator i = buffer->begin();
 
 	while( i != buffer->end() )
 	{
-		utf8_buffer[index++] = *i;
-
-		if( index + 10 > sizeof(utf8_buffer) / sizeof(char) )
+		if( index + utf8_sequence_max_length > buffer_len )
 		{
 			out_stream.write(utf8_buffer, index);
 			index = 0;
 		}
 
+		index += PT::IntToUTF8(*i, utf8_buffer + index, buffer_len - index);
 		++i;
 	}