X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetugroups.c;h=e102f21ca1e90e70065713a15d8d84a20015fe25;hb=3aa0d4da24ba7b52282b1d124b4118e4e8a46a2b;hp=01d36ff109eac5ac2c9065446c7a4a1b578ef802;hpb=1ef07171f7e8abdb703651a0f6c81e17559b3720;p=gnulib.git

diff --git a/lib/getugroups.c b/lib/getugroups.c
index 01d36ff10..e102f21ca 100644
--- a/lib/getugroups.c
+++ b/lib/getugroups.c
@@ -1,10 +1,11 @@
 /* getugroups.c -- return a list of the groups a user is in
-   Copyright (C) 1990, 1991, 1998, 1999 Free Software Foundation.
 
-   This program is free software; you can redistribute it and/or modify
+   Copyright (C) 1990, 1991, 1998-2000, 2003-2008 Free Software Foundation.
+
+   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
@@ -12,59 +13,72 @@
    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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by David MacKenzie. */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+#include "getugroups.h"
 
-#include <sys/types.h>
+#include <limits.h>
 #include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
 #include <grp.h>
 
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
+
+#include <errno.h>
 
-/* setgrent, getgrent, and endgrent are not specified by POSIX.1,
-   so header files might not declare them.
+/* Some old header files might not declare setgrent, getgrent, and endgrent.
    If you don't have them at all, we can't implement this function.
    You lose!  */
 struct group *getgrent ();
 
-#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
-# include <string.h>
-#else
-# include <strings.h>
-#endif
+#include <string.h>
 
-/* Like `getgroups', but for user USERNAME instead of for
-   the current process. */
+#define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
+
+/* Like `getgroups', but for user USERNAME instead of for the current
+   process.  Store at most MAXCOUNT group IDs in the GROUPLIST array.
+   If GID is not -1, store it first (if possible).  GID should be the
+   group ID (pw_gid) obtained from getpwuid, in case USERNAME is not
+   listed in /etc/groups.  Upon failure, set errno and return -1.
+   Otherwise, return the number of IDs we've written into GROUPLIST.  */
 
 int
-getugroups (int maxcount, GETGROUPS_T *grouplist, char *username, gid_t gid)
+getugroups (int maxcount, GETGROUPS_T *grouplist, char const *username,
+	    gid_t gid)
 {
-  struct group *grp;
-  register char **cp;
-  register int count = 0;
+  int count = 0;
 
-  if (maxcount != 0)
-    grouplist[count] = gid;
-  ++count;
+  if (gid != (gid_t) -1)
+    {
+      if (maxcount != 0)
+	grouplist[count] = gid;
+      ++count;
+    }
 
   setgrent ();
-  while ((grp = getgrent ()) != 0)
-    for (cp = grp->gr_mem; *cp; ++cp)
-      if (!strcmp (username, *cp))
+  while (1)
+    {
+      char **cp;
+      struct group *grp;
+
+      errno = 0;
+      grp = getgrent ();
+      if (grp == NULL)
+	break;
+
+      for (cp = grp->gr_mem; *cp; ++cp)
 	{
 	  int n;
 
+	  if ( ! STREQ (username, *cp))
+	    continue;
+
 	  /* See if this group number is already on the list.  */
 	  for (n = 0; n < count; ++n)
-	    if (grouplist[n] == grp->gr_gid)
+	    if (grouplist && grouplist[n] == grp->gr_gid)
 	      break;
 
 	  /* If it's a new group number, then try to add it to the list.  */
@@ -73,15 +87,28 @@ getugroups (int maxcount, GETGROUPS_T *grouplist, char *username, gid_t gid)
 	      if (maxcount != 0)
 		{
 		  if (count >= maxcount)
-		    {
-		      endgrent ();
-		      return count;
-		    }
+		    goto done;
 		  grouplist[count] = grp->gr_gid;
 		}
+	      if (count == INT_MAX)
+		{
+		  errno = EOVERFLOW;
+		  goto done;
+		}
 	      count++;
 	    }
 	}
-  endgrent ();
+    }
+
+  if (errno != 0)
+    count = -1;
+
+ done:
+  {
+    int saved_errno = errno;
+    endgrent ();
+    errno = saved_errno;
+  }
+
   return count;
 }