Перекодировка из UTF-8

здесь ты глубоко заблудился

g_convert

g_convert_with_iconv

g_iconv

Вот мой маленький примерчик.
Правда для UTF-8 <-> KOI8-R


//! Converting string from UTF-8 to KOI8-R or from KOI8-R to UTF-8
//! @return true if success
//! @utf2koi true if conversion from KOI8-R to UTF-8, false if otherwise
bool utf2koi(char *src, unsigned int src_len, char *dst, unsigned int dst_len, bool utf2koi)
{
  iconv_t ic;
  if ( utf2koi )
	ic = iconv_open("KOI8-R","UTF-8");
  else
	ic = iconv_open("UTF-8","KOI8-R"); 
  if ( ic == (iconv_t)(-1)) {
    cerr << "[ DEBUG ] Error in iconv_open: " << strerror(errno) << endl;
    return false;
  }
  size_t ret = iconv(ic,&src,&src_len ,&dst,&dst_len);
  if ( ret == (size_t)(-1)) {
	cerr << "[ DEBUG ] Error in iconv: " << strerror(errno) << endl;
	iconv_close(ic);
	return false;
  }
  iconv_close(ic);
  return true;
}