http_get_var

#include <net_config.h>

U8* http_get_var (
    U8*   env,         /* Pointer to a string of environment variables */
    void* ansi,        /* Buffer to store the environment variable value */
    U16   maxlen );    /* Maximum length of environment variable value */

The http_get_var function processes the string env, which contains the environment variables, and identifies where the first variable ends. The function obtains and stores the first variable and its value into the buffer pointed by ansi, in ansi format.

The maxlen specifies the maximum length that can be stored in the ansi buffer. If the decoded environment variable value is longer than this limit, the function truncates it to maxlen to fit it into the buffer.

The http_get_var function is a system function that is in the RL-TCPnet library. The prototype is defined in net_config.h.

Note

• The http_get_var function can process environment variables from the GET and POST methods.
• You can call this function from the HTTP_CGI.c module.
• The web browser uses environment variables to return user-entered information that is requested in the HTTP input form.

The http_get_var function returns a pointer to the remaining environment variables to process. It returns NULL if there are no more environment variables to process.

cgi_process_data, cgi_process_var

void cgi_process_var (U8 *qs) {
  U8 var[40];

  do {
    /* Loop through all the parameters. */
    qs = http_get_var (qs, var, 40);
    /* Check the returned string, 'qs' now points to the next. */
    if (var[0] != 0) {
      /* Returned string is non 0-length. */
      if (str_scomp (var, "ip=") == __TRUE) {
        /* My IP address parameter. */
        sscanf (&var[3], "%bd.%bd.%bd.%bd",&LocM.IpAdr[0],&LocM.IpAdr[1],
                                           &LocM.IpAdr[2],&LocM.IpAdr[3]);
      }
      else if (str_Scomp (var, "msk=") == __TRUE) {
        /* Net mask parameter. */
        sscanf (&var[4], "%bd.%bd.%bd.%bd",&LocM.NetMask[0],&LocM.NetMask[1],
                                           &LocM.NetMask[2],&LocM.NetMask[3]);
      }
      else if (str_scomp (var, "gw=") == __TRUE) {
       ..
      }
    }
  } while (qs);
}