rb_enc_codepoint 1068 encoding.c     #undef rb_enc_codepoint
rb_enc_codepoint 1070 encoding.c     rb_enc_codepoint(const char *p, const char *e, rb_encoding *enc)
rb_enc_codepoint  200 include/ruby/encoding.h #define rb_enc_codepoint(p,e,enc) rb_enc_codepoint_len((p),(e),0,(enc))