/* URL encoding C version
*       Lin Jensen
*       Feb 21, 1999	25 Feb 2005 stripped down version
*       A new string is produced, URL encoded. Rules are
*               Alphanumeric chars unchanged
*               Space --> '+'
*               Special chars (the rest) --> "%hh" where hh is hexadecimal
************************************************************************/
void URLencode (const char * plain, char * encode){
    register char ch;            /* each char, use $s2 */

    while (ch = *plain ++) {     /* get char, test end of string, asciiz */
        if (ch == ' ')
            * encode ++ = '+';
        else if (AlphaNumeric (ch))
            * encode ++ = ch;
        else {
            * encode ++ = '%';
            * encode ++ = bin2hex (ch >> 4); /*shift right for left nibble*/
            * encode ++ = bin2hex (ch);      /* right nibble */
        }
    }
    * encode = 0;               /* store zero byte to terminate string */
}   /* URLencode*/