ONIGENC_MBCLEN_NEEDMORE_LEN  188 include/ruby/encoding.h #define MBCLEN_NEEDMORE_LEN(ret)      ONIGENC_MBCLEN_NEEDMORE_LEN(ret)
ONIGENC_MBCLEN_NEEDMORE_LEN   61 regenc.c           return (int)(e-p)+ONIGENC_MBCLEN_NEEDMORE_LEN(ret);