X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetugroups.c;h=970192e6750b66b17b3aafbbf051e3b1042d81bf;hb=74fcb0575a5b053a1b1078a5595c1795790c63cb;hp=afa425b6e53c43c5ad3946dc9f5ff9801648152d;hpb=fc161832d9fb17b5250deb46963b4890acf0054c;p=gnulib.git

diff --git a/lib/getugroups.c b/lib/getugroups.c
index afa425b6e..970192e67 100644
--- a/lib/getugroups.c
+++ b/lib/getugroups.c
@@ -1,5 +1,7 @@
 /* getugroups.c -- return a list of the groups a user is in
-   Copyright (C) 1990, 1991, 1998 Free Software Foundation.
+
+   Copyright (C) 1990, 1991, 1998, 1999, 2000, 2003, 2004, 2005, 2006
+   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
@@ -13,54 +15,66 @@
 
    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.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 /* Written by David MacKenzie. */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
 #include <sys/types.h>
 #include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
 #include <grp.h>
 
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
+#include <unistd.h>
+
+#include <errno.h>
+#ifndef EOVERFLOW
+# define EOVERFLOW EINVAL
 #endif
 
-/* 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>
+
+#define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
 
-/* Like `getgroups', but for user USERNAME instead of for
-   the current process. */
+/* 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.
+   Always return the number of groups of which USERNAME is a member.  */
 
 int
-getugroups (int maxcount, GETGROUPS_T *grouplist, char *username)
+getugroups (int maxcount, GETGROUPS_T *grouplist, char *username, gid_t gid)
 {
   struct group *grp;
   register char **cp;
   register int count = 0;
 
+  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))
+    {
+      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.  */
@@ -76,8 +90,15 @@ getugroups (int maxcount, GETGROUPS_T *grouplist, char *username)
 		  grouplist[count] = grp->gr_gid;
 		}
 	      count++;
+	      if (count < 0)
+		{
+		  errno = EOVERFLOW;
+		  return -1;
+		}
 	    }
 	}
+    }
   endgrent ();
+
   return count;
 }