break out special local mail processing (e.g., mapping to the

[unix-history] / usr / src / usr.bin / logname / logname.c

/*-
* Copyright (c) 1991, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)logname.c   8.2 (Berkeley) %G%";
#endif /* not lint */

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

void usage __P((void));

int
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)
               err(1, NULL);
       (void)printf("%s\n", p);
       exit(0);
}

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