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-rw-r--r--posix/id.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/posix/id.c b/posix/id.c
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+++ b/posix/id.c
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+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <grp.h>
+#include <pwd.h>
+#include <limits.h>
+#include <sys/types.h>
+
+
+static void
+DEFUN(print_grpname, (id, parens),
+ gid_t id AND int parens)
+{
+ CONST struct group *CONST g = getgrgid(id);
+ if (g == NULL)
+ {
+ if (parens)
+ return;
+ else
+ {
+ fprintf(stderr, "Couldn't find name for group %d\n", id);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if (parens)
+ printf("(%s)", g->gr_name);
+ else
+ puts(g->gr_name);
+}
+
+static void
+DEFUN(print_pwdname, (id, parens),
+ uid_t id AND int parens)
+{
+ CONST struct passwd *CONST p = getpwuid(id);
+ if (p == NULL)
+ {
+ if (parens)
+ return;
+ else
+ {
+ fprintf(stderr, "Couldn't find name for user %d\n", (int) id);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if (parens)
+ printf("(%s)", p->pw_name);
+ else
+ puts(p->pw_name);
+}
+
+int
+DEFUN(main, (argc, argv), int argc AND char **argv)
+{
+ int print_gid = 1, print_uid = 1;
+ int real = 0, name = 0;
+ int error = 0;
+ register int c;
+
+ uid_t ruid = getuid(), euid = geteuid();
+ gid_t rgid = getgid(), egid = getegid();
+
+ while ((c = getopt(argc, argv, "gurn")) != -1)
+ switch (c)
+ {
+ default:
+ error = 1;
+ break;
+
+ case 'g':
+ print_gid = 1;
+ print_uid = 0;
+ break;
+
+ case 'u':
+ print_uid = 1;
+ print_gid = 0;
+ break;
+
+ case 'r':
+ real = 1;
+ break;
+
+ case 'n':
+ name = 1;
+ break;
+ }
+
+ if (error || argc != optind)
+ {
+ fputs("Usage: id [-gurn]\n", stderr);
+ exit(EXIT_FAILURE);
+ }
+
+ if (print_uid && !print_gid)
+ {
+ CONST uid_t uid = real ? ruid : euid;
+ if (name)
+ print_pwdname(uid, 0);
+ else
+ printf("%d\n", (int) uid);
+ }
+ else if (print_gid && !print_uid)
+ {
+ CONST gid_t gid = real ? rgid : egid;
+ if (name)
+ print_grpname(gid, 0);
+ else
+ printf("%d\n", (int) gid);
+ }
+ else
+ {
+#if NGROUPS_MAX > 0
+ gid_t groups[NGROUPS_MAX];
+ int ngroups;
+ ngroups = getgroups(NGROUPS_MAX, groups);
+#endif
+
+ printf("uid=%d", (int) ruid);
+ print_pwdname(ruid, 1);
+ printf(" gid=%d", (int) rgid);
+ print_grpname(rgid, 1);
+ if (euid != ruid)
+ {
+ printf(" euid=%d", (int) euid);
+ print_pwdname(euid, 1);
+ }
+ if (egid != rgid)
+ {
+ printf(" egid=%d", (int) egid);
+ print_grpname(egid, 1);
+ }
+
+#if NGROUPS > 0
+ if (ngroups > 0)
+ {
+ register size_t i;
+ printf(" groups=%d", (int) groups[0]);
+ print_grpname(groups[0], 1);
+ for (i = 1; i < ngroups; ++i)
+ {
+ printf(", %d", (int) groups[i]);
+ print_grpname(groups[i], 1);
+ }
+ }
+#endif
+
+ putchar('\n');
+ }
+
+ exit(EXIT_SUCCESS);
+}