nkf_buf_empty_p   887 ext/nkf/nkf-utf8/nkf.c     assert(!nkf_buf_empty_p(buf));
nkf_buf_empty_p  3332 ext/nkf/nkf-utf8/nkf.c     if (!nkf_buf_empty_p(nkf_state->std_gc_buf)){
nkf_buf_empty_p  3694 ext/nkf/nkf-utf8/nkf.c     if (!nkf_buf_empty_p(nkf_state->broken_buf)) {