libbb: move is_in_supplementary_groups() from test to libbb

function                                             old     new   delta
is_in_supplementary_groups                             -      54     +54
nexpr                                                766     721     -45
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 54/-45)              Total: 9 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 19 deletions

diff --git a/coreutils/test.c b/coreutils/test.c
index c02c92745..874285704 100644
--- a/coreutils/test.c
+++ b/coreutils/test.c
@@ -637,32 +637,14 @@ static int binop(void)
         /*return 1; - NOTREACHED */
 }
 
-static void initialize_group_array(void)
-{
-        group_array = bb_getgroups(&ngroups, NULL);
-}
-
 /* Return non-zero if GID is one that we have in our groups list. */
-//XXX: FIXME: duplicate of existing libbb function?
-// see toplevel TODO file:
-// possible code duplication ingroup() and is_a_group_member()
 static int is_a_group_member(gid_t gid)
 {
-        int i;
-
         /* Short-circuit if possible, maybe saving a call to getgroups(). */
         if (gid == getgid() || gid == getegid())
                 return 1;
 
-        if (ngroups == 0)
-                initialize_group_array();
-
-        /* Search through the list looking for GID. */
-        for (i = 0; i < ngroups; i++)
-                if (gid == group_array[i])
-                        return 1;
-
-        return 0;
+        return is_in_supplementary_groups(&ngroups, &group_array, gid);
 }
 
 /*