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/* whoami -- print effective userid
Copyright (C) 89, 90, 91, 92, 93, 94, 1995 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. */
/* Equivalent to `id -un'. */
/* Written by Richard Mlynarik. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <getopt.h>
#include "version.h"
#include "system.h"
/* The name this program was run with. */
char *program_name;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, 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;
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]...\n"), program_name);
printf (_("\
Print the user name associated with the current effective user id.\n\
Same as id -un.\n\
\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 struct passwd *pw;
register uid_t uid;
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 ("whoami - %s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
if (optind != argc)
usage (1);
uid = geteuid ();
pw = getpwuid (uid);
if (pw)
{
puts (pw->pw_name);
exit (0);
}
fprintf (stderr, _("%s: cannot find username for UID %u\n"),
program_name, (unsigned) uid);
exit (1);
}
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