[C++] Zmiana nazw plików (tworzenie pliku) polskie znaki.

#include <stdio.h>
#include <string.h>

// -------------------------------------

int get_char_bytes( unsigned char val )
{
    if( val < 128 ) return 1;
    else if( val < 224 ) return 2;
    else if( val < 240 ) return 3;
   
    return 4;
}

// -------------------------------------

void _add_utf8_to_ansi_string( char * val, char * string, size_t * counter, size_t limit )
{
    size_t length = strlen( val ), x = 0;
   
    if( * counter + length > limit )
         return;
   
    while( x < length )
         string[( * counter ) ++ ] = val[ x++ ];
   
}

// -------------------------------------

void add_utf8_to_ansi_string( int val, char * string, size_t * counter, size_t limit )
{
    if( * counter + 1 > limit )
         return;
   
    if( val <= 0x7F )
         string[( * counter ) ++ ] =( char ) val;
    else switch( val )
    {
    case 0xC484: _add_utf8_to_ansi_string( "Ą", string, counter, limit ); break;
    case 0xC485: _add_utf8_to_ansi_string( "ą", string, counter, limit ); break;
    case 0xC486: _add_utf8_to_ansi_string( "Ć", string, counter, limit ); break;
    case 0xC487: _add_utf8_to_ansi_string( "ć", string, counter, limit ); break;
    case 0xC498: _add_utf8_to_ansi_string( "Ę", string, counter, limit ); break;
    case 0xC499: _add_utf8_to_ansi_string( "ę", string, counter, limit ); break;
    case 0xC581: _add_utf8_to_ansi_string( "Ł", string, counter, limit ); break;
    case 0xC582: _add_utf8_to_ansi_string( "ł", string, counter, limit ); break;
    case 0xC393: _add_utf8_to_ansi_string( "Ó", string, counter, limit ); break;
    case 0xC3B3: _add_utf8_to_ansi_string( "ó", string, counter, limit ); break;
    case 0xC59A: _add_utf8_to_ansi_string( "Ś", string, counter, limit ); break;
    case 0xC59B: _add_utf8_to_ansi_string( "ś", string, counter, limit ); break;
    case 0xC5BB: _add_utf8_to_ansi_string( "Ż", string, counter, limit ); break;
    case 0xC5BC: _add_utf8_to_ansi_string( "ż", string, counter, limit ); break;
    case 0xC5B9: _add_utf8_to_ansi_string( "Ź", string, counter, limit ); break;
    case 0xC5BA: _add_utf8_to_ansi_string( "ź", string, counter, limit ); break;
    case 0xC583: _add_utf8_to_ansi_string( "Ń", string, counter, limit ); break;
    case 0xC584: _add_utf8_to_ansi_string( "ń", string, counter, limit ); break;
    }
}

// -------------------------------------

int main( int argc, char ** argv )
{
    FILE * data = NULL;
    int sign = 0;
    size_t x = 0, y = 0;
    char nfname[ 256 ] = { 0 };
    int resnum = 0;
   
    data = fopen( "data.txt", "r" );
    if( !data ) return 1;
   
    while(( sign = fgetc( data ) ) != EOF && x < 255 )
    {
        resnum = 0;
        y = get_char_bytes(( unsigned char ) sign );
       
        while( --y > 0 )
        {
            resnum |= sign << 8 * y;
            printf( "%d ", sign );
            sign = fgetc( data );
        }
       
        printf( "%d ", sign );
        resnum |= sign;
       
        printf( "%d (0x%X)\n", resnum, resnum );
        add_utf8_to_ansi_string( resnum, nfname, & x, 256 );
    }
   
    printf( "%s\n", nfname );
   
    data = fopen( "test.txt", "w" );
    if( !data ) return 1;
   
    fclose( data );
    rename( "test.txt", nfname );
   
    getchar();
    return 0;
}