int mutt_display_char(int ch, CHARSET *in_charset, CHARSET *out_charset)
int mutt_display_char(int ch, UNICODE_MAP *map)
int mutt_display_char(int ch, CHARSET *in_charset, CHARSET *out_charset){  int i;  if (!in_charset || !out_charset || (in_charset == out_charset) || (ch < 128) || (ch > 255))     return ch;    ch = (*in_charset->map)[ch - 128];  if (ch == -1) return '?';  if (ch < 128) return ch;  for (i = 0; i < 128; i++)  {    if ((*out_charset->map)[i] == ch)       return (128 + i);  }  return '?';}