174 lines
3.4 KiB
C
174 lines
3.4 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <grp.h>
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#include <pwd.h>
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#include <limits.h>
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#include <sys/types.h>
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static void
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DEFUN(print_grpname, (id, parens),
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gid_t id AND int parens)
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{
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CONST struct group *CONST g = getgrgid(id);
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if (g == NULL)
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{
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if (parens)
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return;
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else
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{
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fprintf(stderr, "Couldn't find name for group %d\n", id);
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exit(EXIT_FAILURE);
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}
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}
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if (parens)
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printf("(%s)", g->gr_name);
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else
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puts(g->gr_name);
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}
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static void
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DEFUN(print_pwdname, (id, parens),
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uid_t id AND int parens)
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{
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CONST struct passwd *CONST p = getpwuid(id);
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if (p == NULL)
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{
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if (parens)
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return;
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else
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{
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fprintf(stderr, "Couldn't find name for user %d\n", (int) id);
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exit(EXIT_FAILURE);
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}
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}
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if (parens)
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printf("(%s)", p->pw_name);
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else
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puts(p->pw_name);
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}
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int
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DEFUN(main, (argc, argv), int argc AND char **argv)
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{
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int print_gid = 1, print_uid = 1;
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int real = 0, name = 0;
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int error = 0;
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register int c;
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uid_t ruid = getuid(), euid = geteuid();
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gid_t rgid = getgid(), egid = getegid();
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while ((c = getopt(argc, argv, "gurn")) != -1)
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switch (c)
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{
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default:
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error = 1;
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break;
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case 'g':
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print_gid = 1;
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print_uid = 0;
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break;
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case 'u':
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print_uid = 1;
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print_gid = 0;
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break;
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case 'r':
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real = 1;
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break;
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case 'n':
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name = 1;
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break;
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}
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if (error || argc != optind)
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{
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fputs("Usage: id [-gurn]\n", stderr);
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exit(EXIT_FAILURE);
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}
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if (print_uid && !print_gid)
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{
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CONST uid_t uid = real ? ruid : euid;
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if (name)
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print_pwdname(uid, 0);
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else
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printf("%d\n", (int) uid);
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}
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else if (print_gid && !print_uid)
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{
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CONST gid_t gid = real ? rgid : egid;
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if (name)
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print_grpname(gid, 0);
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else
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printf("%d\n", (int) gid);
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}
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else
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{
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#if NGROUPS_MAX > 0
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gid_t groups[NGROUPS_MAX];
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int ngroups;
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ngroups = getgroups(NGROUPS_MAX, groups);
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#endif
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printf("uid=%d", (int) ruid);
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print_pwdname(ruid, 1);
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printf(" gid=%d", (int) rgid);
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print_grpname(rgid, 1);
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if (euid != ruid)
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{
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printf(" euid=%d", (int) euid);
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print_pwdname(euid, 1);
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}
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if (egid != rgid)
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{
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printf(" egid=%d", (int) egid);
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print_grpname(egid, 1);
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}
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#if NGROUPS > 0
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if (ngroups > 0)
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{
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register size_t i;
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printf(" groups=%d", (int) groups[0]);
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print_grpname(groups[0], 1);
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for (i = 1; i < ngroups; ++i)
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{
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printf(", %d", (int) groups[i]);
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print_grpname(groups[i], 1);
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}
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}
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#endif
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putchar('\n');
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}
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exit(EXIT_SUCCESS);
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}
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