/*
 * Web server, written in SmallC.
 *
 * A simple web server that shows the value of the analog input pins.
 * using an Arduino Wiznet Ethernet shield.
 *
 * 18 Dec 2009 created by David A. Mellis
 *  4 Sep 2010 modified by Tom Igoe
 * 16 Apr 2012 ported to RetroBSD by Serge Vakulenko
 */
#include <stdio.h>
#include <fcntl.h>
#include <sys/gpio.h>
#include <wiznet.h>

int client [CLIENT_SIZE];

char buf [80];

main()
{
    /* Initialize the Ethernet server library
     * with the IP address and port you want to use
     * (port 80 is default for HTTP). */
    ethernet_init ();
    server_init (80);

    for (;;) {
        /* Listen for incoming clients. */
        if (server_available (client)) {
            process_request();
        }
    }
}

process_request()
{
    int current_line_is_blank;
    int c, fd, pnum, value;

    /* An http request ends with a blank line. */
    current_line_is_blank = 1;

    /* Parse the http request. */
    while (client_connected (client)) {
        if (client_available (client)) {
            c = client_getc (client);

            /* If you've gotten to the end of the line (received
             * a newline character) and the line is blank, the http
             * request has ended, so you can send a reply. */
            if (c == '\n' && current_line_is_blank)
                break;

            if (c == '\n') {
                /* You're starting a new line. */
                current_line_is_blank = 1;
            }
            else if (c != '\r') {
                /* You've gotten a character on the current line. */
                current_line_is_blank = 0;
            }
        }
    }

    /* Send a standard http response header. */
    client_puts (client, "HTTP/1.1 200 OK\n");
    client_puts (client, "Content-Type: text/html\n\n");

    /* Output the value of each digital pin. */
    fd = open ("/dev/porta", O_RDONLY);
    if (fd < 0) {
        client_puts (client, "Failed to open /dev/porta\n");
    } else {
        for (pnum = 0; pnum < 6; pnum++) {
            value = ioctl (fd, GPIO_POLL | GPIO_PORT (pnum), 0);
            sprintf (buf, "PORT%c = 0x%04x <br />\n", pnum+'A', value);
            client_puts (client, buf);
        }
        close (fd);
    }

    /* Give the web browser time to receive the data. */
    usleep (1000);

    /* Close the connection. */
    client_stop (client);
}