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/* provide consistent interface to getgroups for systems that don't allow N==0
Copyright (C) 1996 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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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. */
/* written by Jim Meyering */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
char *xmalloc ();
/* On Ultrix 4.3, getgroups (0, 0) always fails.
This function handles that special case and lets the system-
provided function handle all others. */
int
getgroups (n, group)
size_t n;
GETGROUPS_T *group;
{
int ng;
GETGROUPS_T *gbuf;
#undef getgroups
if (n != 0)
return getgroups (n, group);
n = 20;
gbuf = NULL;
while (1)
{
gbuf = (GETGROUPS_T *) xrealloc (gbuf, n * sizeof (GETGROUPS_T));
ng = getgroups (n, gbuf);
if (ng < n)
break;
n += 10;
}
free (gbuf);
return ng;
}
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