X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgroup-member.c;h=a34efc04afa2bdf4e6f8cca1338955e6e5f191d9;hb=0401ff0087c516234b3bfd07b113f32b95d9d599;hp=f9bb8fcd4a9903689b893def59ede3769edc11c6;hpb=07910a77f2c542554338c7ca333d5ec03a09cbe3;p=gnulib.git

diff --git a/lib/group-member.c b/lib/group-member.c
index f9bb8fcd4..a34efc04a 100644
--- a/lib/group-member.c
+++ b/lib/group-member.c
@@ -1,10 +1,12 @@
 /* group-member.c -- determine whether group id is in calling user's group list
-   Copyright (C) 1994 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   Copyright (C) 1994, 1997, 1998, 2003, 2005, 2006 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.
+   the Free Software Foundation; either version 3 of the License, 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
@@ -12,35 +14,20 @@
    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.  */
-
-#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
-   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
-   (which it would do because it found this file in $srcdir).  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
 #include <config.h>
-#else
-#include "config.h"
-#endif
-#endif
 
+#include "group-member.h"
+
+#include <stdbool.h>
 #include <stdio.h>
 #include <sys/types.h>
-
-#ifdef STDC_HEADERS
 #include <stdlib.h>
-#endif
 
-#ifdef HAVE_UNISTD_H
 #include <unistd.h>
-#endif
 
-#include "group-member.h"
-
-char *xmalloc ();
-char *xrealloc ();
+#include "xalloc.h"
 
 struct group_info
   {
@@ -48,52 +35,41 @@ struct group_info
     GETGROUPS_T *group;
   };
 
-#ifdef HAVE_GETGROUPS
+#if HAVE_GETGROUPS
 
 static void
-free_group_info (g)
-     struct group_info *g;
+free_group_info (struct group_info const *g)
 {
   free (g->group);
-  free (g);
 }
 
-static struct group_info *
-get_group_info ()
+static bool
+get_group_info (struct group_info *gi)
 {
   int n_groups;
-  int n_group_slots;
-  struct group_info *gi;
+  int n_group_slots = getgroups (0, NULL);
   GETGROUPS_T *group;
 
-  /* getgroups () returns the number of elements that it was able to
-     place into the array.  We simply continue to call getgroups ()
-     until the number of elements placed into the array is smaller than
-     the physical size of the array. */
+  if (n_group_slots < 0)
+    return false;
 
-  group = NULL;
-  n_groups = 0;
-  n_group_slots = 0;
-  while (n_groups == n_group_slots)
-    {
-      n_group_slots += 64;
-      group = (GETGROUPS_T *) xrealloc (group,
-					n_group_slots * sizeof (GETGROUPS_T));
-      n_groups = getgroups (n_group_slots, group);
-    }
+  /* Avoid xnmalloc, as it goes awry when SIZE_MAX < n_group_slots.  */
+  if (xalloc_oversized (n_group_slots, sizeof *group))
+    xalloc_die ();
+  group = xmalloc (n_group_slots * sizeof *group);
+  n_groups = getgroups (n_group_slots, group);
 
   /* In case of error, the user loses. */
   if (n_groups < 0)
     {
       free (group);
-      return NULL;
+      return false;
     }
 
-  gi = (struct group_info *) xmalloc (sizeof (*gi));
   gi->n_groups = n_groups;
   gi->group = group;
 
-  return gi;
+  return true;
 }
 
 #endif /* not HAVE_GETGROUPS */
@@ -103,32 +79,30 @@ get_group_info ()
    either of the current or effective group IDs.  */
 
 int
-group_member (gid)
-     gid_t gid;
+group_member (gid_t gid)
 {
 #ifndef HAVE_GETGROUPS
   return ((gid == getgid ()) || (gid == getegid ()));
 #else
   int i;
   int found;
-  struct group_info *gi;
+  struct group_info gi;
 
-  gi = get_group_info ();
-  if (gi == NULL)
+  if (! get_group_info (&gi))
     return 0;
 
   /* Search through the list looking for GID. */
   found = 0;
-  for (i = 0; i < gi->n_groups; i++)
+  for (i = 0; i < gi.n_groups; i++)
     {
-      if (gid == gi->group[i])
+      if (gid == gi.group[i])
 	{
 	  found = 1;
 	  break;
 	}
     }
-  
-  free_group_info (gi);
+
+  free_group_info (&gi);
 
   return found;
 #endif /* HAVE_GETGROUPS */
@@ -139,7 +113,7 @@ group_member (gid)
 char *program_name;
 
 int
-main (int argc, char** argv)
+main (int argc, char **argv)
 {
   int i;