#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

static void restore(int sig)
{
    char buf[] = "\e]R";
    write(0, buf, sizeof(buf));
    exit(EXIT_SUCCESS);
}

#define to_hex(v) ((v) > 9 ? (v) + 'a' - 10 : (v) + '0')

int main(int argc, char** argv)
{
    char buf[] = "\e]P0000000";
    int i;

    signal(SIGINT, restore);

    while (1) {
        for (i = 0; i < 512; i += 16) {
            if (i < 256) {
                buf[6] = buf[8] = to_hex(i / 16);
                buf[7] = buf[9] = to_hex(i % 16);
            } else {
                buf[6] = buf[8] = to_hex((511 - i) / 16);
                buf[7] = buf[9] = to_hex((511 - i) % 16);
            }
            write(0, buf, sizeof(buf));
        }
    }

    return EXIT_SUCCESS;
}

/* vim: set ts=4 sts=4 sw=4 et: */