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/* ISC license. */
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/skamisc.h>
#include <nsss/grp-def.h>
#include <nsss/grp-unix.h>
#include <nsss/nsss-unix.h>
#include "nsss-unix-internal.h"
int nsss_unix_getgrouplist (char const *user, gid_t gid, gid_t *gids, int *ngids)
{
nsss_unix_t a = NSSS_UNIX_ZERO ;
stralloc sa = STRALLOC_ZERO ;
genalloc ga = GENALLOC_ZERO ; /* char * */
int e = errno ;
size_t r = 0 ;
size_t n ;
if (*ngids < 0) return (errno = EINVAL, -1) ;
n = *ngids ;
if (!nsss_unix_grp_start(&a)) return -1 ;
if (!nsss_unix_grp_getlist(&a, gids, n, &r, &sa, &ga, user)) return -1 ;
nsss_unix_grp_end(&a) ;
if (r > INT_MAX) return (errno = EMSGSIZE, -1) ;
if (r > n) return (*ngids = (int)r, errno = ENOBUFS, -1) ;
for (size_t i = 0 ; i < r ; i++)
if (gid == gids[i]) goto ok ;
r++ ;
if (r > INT_MAX) return (errno = EMSGSIZE, -1) ;
if (r > n) return (*ngids = (int)r, errno = ENOBUFS, -1) ;
memmove(gids + 1, gids, (r-1) * sizeof(gid_t)) ;
gids[0] = gid ;
ok:
*ngids = (int)r ;
errno = e ;
return (int)n ;
}
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