1 files changed, 43 insertions, 0 deletions
diff --git a/src/libnsss/nsss_unix_getgrouplist.c b/src/libnsss/nsss_unix_getgrouplist.c
new file mode 100644
index 0000000..e9a11ab
--- /dev/null
+++ b/src/libnsss/nsss_unix_getgrouplist.c
@@ -0,0 +1,43 @@
+/* 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 ;
+}