char pr_hex(char *hex) {
  char digit;
  digit = (hex[0] >= 'A' ? ((hex[0] & 0xdf) - 'A')+10 : (hex[0] - '0'));
  digit *= 16;
  digit += (hex[1] >= 'A' ? ((hex[1] & 0xdf) - 'A')+10 : (hex[1] - '0'));
  return (digit);
}

char *pr_unescape(char *string) {
  int x, y, len;
  
  if(!string) return string;
  len = pr_strlen(string);
  if(len < 2) return string;
  for(x = 0, y = 0; string[y]; x++, y++) {
    if ((string[x] = string[y]) == '%' && y < len - 2) {
      string[x] = pr_hex(&string[y + 1]);
      y += 2;
    } else if(string[x] == '+') {
       string[x] = ' ';
    }
  }
  string[x] = '\0';
  return string;
}