usr/src/usr.bin/logname/logname.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)logname.c   5.1 (Berkeley) %G%";
#endif /* not lint */

#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

main(argc, argv)
        int argc;
        char *argv[];
{
        int ch;
        char *p;

        while ((ch = getopt(argc, argv, "")) != EOF)
                switch(ch) {
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if ((p = getlogin()) == NULL) {
                (void)fprintf(stderr, "logname: %s\n", strerror(errno));
                exit(1);
        }
        (void)printf("%s\n", p);
        exit(0);
}

usage()
{
        (void)fprintf(stderr, "usage: logname\n");
        exit(1);
}