nkf_iconv_utf_16 5885 ext/nkf/nkf-utf8/nkf.c 	    size_t ret = nkf_iconv_utf_16(c1, c2, 0, 0);
nkf_iconv_utf_16 5889 ext/nkf/nkf-utf8/nkf.c 		nkf_iconv_utf_16(c1, c2, c3, c4);