2. Using cgihtml

/* template using cgihtml.a library */

#include <stdio.h>    /* standard io functions */
#include <signal.h>   /* this and unistd.h for signal trapping */
#include <unistd.h>
#include "cgi-lib.h"  /* CGI-related routines */
#include "html-lib.h" /* HTML-related routines */

int main()
{
  llist entries;  /* define a linked list; this is where the entries */
                  /* are stored. */

  /* prevent runaway processes; assume that the program will finish */
  /* executing in a few seconds.  If the program is still running after */
  /* 30 seconds, assume it is running out of control and die. */
  signal(SIGALRM, die);
  alarm(30);

  read_cgi_input(&entries);  /* parse the form data and add it to the list */

/* The data is now in a very usable form.  To search the list entries 
   by name, call the function:
        cgi_val(entries, "nameofentry")
   which returns a pointer to the value associated with "nameofentry". */

  html_header();  /* print HTML MIME header */
  html_begin("Output");    /* send appropriate HTML headers with title */
                           /*  */

/* display whatever data you wish, probably with printf() */

  html_end();   /* send appropriate HTML end footers ( ) */
  list_clear(&entries);   /* free up the pointers in the linked list */
  exit(0);   /* exit successfully */
}

cc -o program.cgi program.cgi.o cgihtml.a