// ###########################  urlencode #####################################
static unsigned char hexchars[] = "0123456789ABCDEF";

char *URLencode(const char *s)
{
    int x, y;
    int len;
    unsigned char *str;
    char *ptr;
    len = strlen(s);
    str = (unsigned char *) malloc(3 * len + 1);
    for (x = 0, y = 0; len--; x++, y++) {
	str[y] = (unsigned char) s[x];
	if ((str[y] < '0' && str[y] != '-' && str[y] != '.' && str[y] != '/') ||
		(str[y] < 'A' && str[y] > '9') ||
		(str[y] > 'Z' && str[y] < 'a' && str[y] != '_') ||
		(str[y] > 'z')) {
	    str[y++] = '%';
	    str[y++] = hexchars[(unsigned char) s[x] >> 4];
	    str[y] = hexchars[(unsigned char) s[x] & 15];
	}
    }
    str[y] = '\0';
    return ((char *) str);
}