/* getugroups.c -- return a list of the groups a user is in
- Copyright (C) 1990, 1991, 1998-2000, 2003-2007 Free Software Foundation.
+ Copyright (C) 1990, 1991, 1998-2000, 2003-2008 Free Software Foundation.
- This program is free software; you can redistribute it and/or modify
+ 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
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by David MacKenzie. */
#include "getugroups.h"
+#include <limits.h>
#include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
#include <grp.h>
#include <unistd.h>
#include <errno.h>
-#ifndef EOVERFLOW
-# define EOVERFLOW EINVAL
-#endif
/* 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.
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. */
+ 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 const *username,
gid_t gid)
{
- struct group *grp;
int count = 0;
if (gid != (gid_t) -1)
}
setgrent ();
- while ((grp = getgrent ()) != 0)
+ while (1)
{
char **cp;
+ struct group *grp;
+
+ errno = 0;
+ grp = getgrent ();
+ if (grp == NULL)
+ break;
+
for (cp = grp->gr_mem; *cp; ++cp)
{
int n;
goto done;
grouplist[count] = grp->gr_gid;
}
- count++;
- if (count < 0)
+ if (count == INT_MAX)
{
errno = EOVERFLOW;
- count = -1;
goto done;
}
+ count++;
}
}
}
+ if (errno != 0)
+ count = -1;
+
done:
{
int saved_errno = errno;