sbase/tty.c
Laslo Hunhold e92a1aef54 Handle { NULL } argv[] properly in manual arg-reduction
Thanks izabera for reporting this!
2017-08-05 23:50:39 +02:00

28 lines
412 B
C

/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s\n", argv0);
}
int
main(int argc, char *argv[])
{
char *tty;
argv0 = *argv, argv0 ? (argc--, argv++) : (void *)0;
if (argc)
usage();
tty = ttyname(STDIN_FILENO);
puts(tty ? tty : "not a tty");
return fshut(stdout, "<stdout>") || !tty;
}