grscan
static int grscan(int, gid_t, const char *, const char *);
if ((!_gr_fp && !grstart()) || !grscan(0, 0, NULL, NULL))
rval = grscan(1, 0, name, NULL);
rval = grscan(1, gid, NULL, NULL);
rval = grscan(1, 0, name);
rval = grscan(1, gid, NULL);
static int grscan(int, gid_t, const char *);