mirror of
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113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/* whoami -- print effective userid
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Copyright (C) 89, 90, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Equivalent to `id -un'. */
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/* Written by Richard Mlynarik. */
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#include <config.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <getopt.h>
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#include "system.h"
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/* The name this program was run with. */
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char *program_name;
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/* If nonzero, display usage information and exit. */
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static int show_help;
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/* If nonzero, print the version on standard output and exit. */
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static int show_version;
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static struct option const long_options[] =
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{
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{"help", no_argument, &show_help, 1},
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{"version", no_argument, &show_version, 1},
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{0, 0, 0, 0}
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};
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static void
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usage (int status)
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{
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if (status != 0)
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fprintf (stderr, _("Try `%s --help' for more information.\n"),
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program_name);
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else
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{
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printf (_("Usage: %s [OPTION]...\n"), program_name);
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printf (_("\
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Print the user name associated with the current effective user id.\n\
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Same as id -un.\n\
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\n\
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--help display this help and exit\n\
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--version output version information and exit\n"));
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puts (_("\nReport bugs to sh-utils-bugs@gnu.ai.mit.edu"));
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}
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exit (status);
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}
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int
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main (int argc, char **argv)
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{
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register struct passwd *pw;
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register uid_t uid;
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int c;
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program_name = argv[0];
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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while ((c = getopt_long (argc, argv, "", long_options, (int *) 0)) != EOF)
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{
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switch (c)
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{
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case 0:
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break;
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default:
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usage (1);
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}
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}
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if (show_version)
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{
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printf ("whoami (%s) %s\n", GNU_PACKAGE, VERSION);
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exit (0);
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}
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if (show_help)
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usage (0);
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if (optind != argc)
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usage (1);
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uid = geteuid ();
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pw = getpwuid (uid);
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if (pw)
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{
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puts (pw->pw_name);
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exit (0);
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}
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fprintf (stderr, _("%s: cannot find username for UID %u\n"),
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program_name, (unsigned) uid);
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exit (1);
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}
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