initial import

1 files changed, 173 insertions, 0 deletions

diff --git a/posix/id.c b/posix/id.c
new file mode 100644
index 0000000..d886e68
--- /dev/null
+++ b/posix/id.c
@@ -0,0 +1,173 @@
+/* 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);
+}