libbb: simplify parameter passing in is_in_supplementary_groups()

function                                             old     new   delta
is_in_supplementary_groups                            54      52      -2
nexpr                                                721     718      -3
test_exec                                            125     119      -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-11)             Total: -11 bytes

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

1 files changed, 8 insertions, 2 deletions

diff --git a/include/libbb.h b/include/libbb.h
index e06aef08e..99bbf623b 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1203,9 +1203,15 @@ void die_if_bad_username(const char* name) FAST_FUNC;
 gid_t *bb_getgroups(int *ngroups, gid_t *group_array) FAST_FUNC;
 /*
  * True if GID is in our getgroups() result.
- * getgroups() is cached in group_array[], to makse successive calls faster.
+ * getgroups() is cached in supplementary_array[], to make successive calls faster.
  */
-int FAST_FUNC is_in_supplementary_groups(int *pngroups, gid_t **pgroup_array, gid_t gid);
+struct cached_groupinfo {
+        //TODO? gid_t egid;
+        int ngroups;
+        gid_t *supplementary_array;
+};
+//TODO? int FAST_FUNC get_cached_egid(gid_t *egid);
+int FAST_FUNC is_in_supplementary_groups(struct cached_groupinfo *groupinfo, gid_t gid);
 
 #if ENABLE_FEATURE_UTMP
 void FAST_FUNC write_new_utmp(pid_t pid, int new_type, const char *tty_name, const char *username, const char *hostname);