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/*----------------------------------------------------------------------------

** FUNCTION           : to_hex

**

** DESCRIPTION        : Converts an integer value to its hex character

**

**

** INPUTS             : code        - Code to convert

**

** RETURNS            : Character representation

**

----------------------------------------------------------------------------*/

char to_hex(char code)

{

  static char hex[] = "0123456789abcdef";

  return hex[code & 0x0f];

}

/*----------------------------------------------------------------------------

** FUNCTION           : url_encode

**

** DESCRIPTION        : URL encoded version of a string

**

**

** INPUTS             : string to encode

**

** RETURNS            : Encoded string

**

** WARNING            : Uses a small circular pool of strings so that the

**                      user doesn't need to worry about string release

**

----------------------------------------------------------------------------*/

char *url_encode(char *str)

{

    static char tbuf[TBUF_COUNT][TBUF_LENGTH * 3];

    static int  index = 0;

    char       *pp;

    /*

    **  Get the next entry from the small store

    */

    index++;

    if( index >= TBUF_COUNT )

        index = 0;

    pp = tbuf[index];

    char *pstr = str;

    char *pbuf = pp;

    while (*pstr)

    {

        if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~')

            *pbuf++ = *pstr;

        else if (*pstr == ' ')

            *pbuf++ = '+';

        else

        {

            *pbuf++ = '%';

            *pbuf++ = to_hex(*pstr >> 4);

            *pbuf++ = to_hex(*pstr & 15);

        }

        pstr++;

    }

    *pbuf = '\0';

  return pp;

}