ONIGENC_MBCLEN_NEEDMORE_LEN  121 include/ruby/encoding.h #define MBCLEN_NEEDMORE_LEN(ret)      ONIGENC_MBCLEN_NEEDMORE_LEN(ret)
ONIGENC_MBCLEN_NEEDMORE_LEN   60 regenc.c           return e-p+ONIGENC_MBCLEN_NEEDMORE_LEN(ret);