tnet_ccmp

#include <net_config.h>

BOOL tnet_ccmp (
    U8* buf,      /* Pointer to the message from the telnet client. */
    U8* cmd );    /* String containing the command to compare with.  */

The tnet_ccmp function compares the command part of the message in the buffer buf with the string cmd.

The tnet_ccmp function is in the RL-TCPnet library. The prototype is defined in net_config.h.

note

• The tnet_ccmp function is similar to the standard C string function strcmp. The difference is that tnet_ccmp only compares the first string, in buf, that is either terminated by the NULL character or followed by a space character. Hence, you must pass the message from the telnet client using buf and not using cmd.
• All the characters in the string cmd must be in capital letters because the string in buf also has only capital letters. This is due to an internal conversion before calling the tnet_ccmp function.

The tnet_ccmp function returns __TRUE if there is a match. It returns __FALSE, if there is no match.

tnet_process_cmd, tnet_set_delay

U16 tnet_process_cmd (U8 *cmd, U8 *buf, U16 buflen, U32 *pvar) {
  U16 len,val,ch;

  /* Simple Command line parser */
  len = strlen (cmd);

  if (tnet_ccmp (cmd, "BYE") == __TRUE) {
    /* 'BYE' command, send message and disconnect */
    len = str_copy (buf, "\r\nDisconnect...\r\n");
    /* Hi bit of return value is a disconnect flag */
    return (len | 0x8000);
  }

  if (tnet_ccmp (cmd, "ADIN") == __TRUE) {
    /* 'ADIN' command received */
    if (len >= 6) {
      sscanf (cmd+5,"%d",&ch);
      val = AD_in (ch);
      len = sprintf (buf,"\r\n ADIN %d = %d",ch,val);
      return (len);
    }
  }

  if (tnet_ccmp (cmd, "HELP") == __TRUE || tnet_ccmp (cmd, "?") == __TRUE) {
    /* 'HELP' command, display help text */
    len = str_copy (buf,tnet_help);
    return (len);
  }
  /* Unknown command, display message */
  len = str_copy  (buf, "\r\n==> Unknown Command: ");
  len += str_copy (buf+len, cmd);
  return (len);
}