mirror of
git://git.sv.gnu.org/coreutils.git
synced 2026-04-18 17:56:54 +02:00
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/* logname -- print user's login name
|
|
Copyright (C) 1990, 1991 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#if defined (CONFIG_BROKETS)
|
|
/* We use <config.h> instead of "config.h" so that a compilation
|
|
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
|
|
(which it would do because it found this file in $srcdir). */
|
|
#include <config.h>
|
|
#else
|
|
#include "config.h"
|
|
#endif
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <getopt.h>
|
|
|
|
#include "version.h"
|
|
#include "system.h"
|
|
|
|
/* The name this program was run with. */
|
|
char *program_name;
|
|
|
|
/* If non-zero, display usage information and exit. */
|
|
static int show_help;
|
|
|
|
/* If non-zero, print the version on standard output and exit. */
|
|
static int show_version;
|
|
|
|
static struct option const long_options[] =
|
|
{
|
|
{"help", no_argument, &show_help, 1},
|
|
{"version", no_argument, &show_version, 1},
|
|
{0, 0, 0, 0}
|
|
};
|
|
|
|
static void
|
|
usage (status)
|
|
int status;
|
|
{
|
|
fprintf (status == 0 ? stdout : stderr, "\
|
|
Usage: %s [OPTION]...\n\
|
|
",
|
|
program_name);
|
|
|
|
if (status != 0)
|
|
fprintf (stderr, "\nTry `%s --help' for more information.\n",
|
|
program_name);
|
|
else
|
|
|
|
printf ("\
|
|
\n\
|
|
--help display this help and exit\n\
|
|
--version output version information and exit\n\
|
|
");
|
|
|
|
exit (status);
|
|
}
|
|
|
|
void
|
|
main (argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
register char *cp;
|
|
int c;
|
|
|
|
program_name = argv[0];
|
|
|
|
while ((c = getopt_long (argc, argv, "", long_options, (int *) 0)) != EOF)
|
|
{
|
|
switch (c)
|
|
{
|
|
case 0:
|
|
break;
|
|
|
|
default:
|
|
usage (1);
|
|
}
|
|
}
|
|
|
|
if (show_version)
|
|
{
|
|
printf ("%s\n", version_string);
|
|
exit (0);
|
|
}
|
|
|
|
if (show_help)
|
|
usage (0);
|
|
|
|
if (argc - optind != 0)
|
|
usage (1);
|
|
|
|
/* POSIX.2 requires using getlogin (or equivalent code). */
|
|
cp = getlogin ();
|
|
if (cp)
|
|
{
|
|
puts (cp);
|
|
exit (0);
|
|
}
|
|
/* POSIX.2 prohibits using a fallback technique. */
|
|
fprintf (stderr,"%s: no login name\n", argv[0]);
|
|
exit (1);
|
|
}
|