ONIGENC_MBCLEN_NEEDMORE_P  120 include/ruby/encoding.h #define MBCLEN_NEEDMORE_P(ret)      ONIGENC_MBCLEN_NEEDMORE_P(ret)
ONIGENC_MBCLEN_NEEDMORE_P   59 regenc.c         else if (ONIGENC_MBCLEN_NEEDMORE_P(ret))