/*

 * vcstime.c

 *

 * Show time in upper right hand corner of the console screen

 * aeb, 951202, following a suggestion by Miguel de Icaza.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <time.h>

void fatal(char *s)

{

	perror(s);

	exit(1);

}

int number_of_columns()

{

	int fda;

	unsigned char rc[2]; /* unsigned: Ranty@soon.com */

	if ((fda = open("/dev/vcsa", O_RDONLY)) < 0 && (fda = open("/dev/vcsa0", O_RDONLY)) < 0)

		fatal("/dev/vcsa");

	if (read(fda, rc, 2) != 2)

		fatal("/dev/vcsa");

	close(fda);

	return rc[1];

}

int main()

{

	int fd;

	int cols = number_of_columns();

	time_t tid;

	struct tm *t;

	char tijd[10];

	if ((fd = open("/dev/vcs", O_WRONLY)) < 0 && (fd = open("/dev/vcs0", O_WRONLY)) < 0)

		fatal("/dev/vcs");

	while (1) {

		lseek(fd, cols - 10, 0);

		tid = time(0);

		t   = localtime(&tid;;

		sprintf(tijd, " %02d:%02d:%02d", t->tm_hour, t->tm_min, t->tm_sec);

		write(fd, tijd, 9);

		usleep(500000L); /* or sleep(1); */

	}

}