/* getugroups.c -- return a list of the groups a user is in
- Copyright (C) 1990, 1991 Free Software Foundation.
+
+ Copyright (C) 1990, 1991, 1998, 1999, 2000, 2003, 2004 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
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. */
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by David MacKenzie. */
#ifdef HAVE_CONFIG_H
-#include <config.h>
+# include <config.h>
#endif
#include <sys/types.h>
#include <grp.h>
#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+#ifndef EOVERFLOW
+# define EOVERFLOW EINVAL
#endif
/* setgrent, getgrent, and endgrent are not specified by POSIX.1,
You lose! */
struct group *getgrent ();
-#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
-#else
-#include <strings.h>
-#endif
-/* 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.
+ Always return the number of groups of which USERNAME is a member. */
int
-getugroups (maxcount, grouplist, username)
- 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)
{
- if (maxcount != 0)
+ 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 && grouplist[n] == grp->gr_gid)
+ break;
+
+ /* If it's a new group number, then try to add it to the list. */
+ if (n == count)
{
- if (count >= maxcount)
+ if (maxcount != 0)
{
- endgrent ();
- return count;
+ if (count >= maxcount)
+ {
+ endgrent ();
+ return count;
+ }
+ grouplist[count] = grp->gr_gid;
+ }
+ count++;
+ if (count < 0)
+ {
+ errno = EOVERFLOW;
+ return -1;
}
- grouplist[count] = grp->gr_gid;
}
- count++;
}
+ }
endgrent ();
+
return count;
}