rb_econv_append   350 include/ruby/encoding.h VALUE rb_econv_append(rb_econv_t *ec, const char *bytesrc, long bytesize, VALUE dst, int flags);
rb_econv_append  1855 transcode.c        dst = rb_econv_append(ec, RSTRING_PTR(src) + off, len, dst, flags);
rb_econv_append   306 win32/file.c   	dst = rb_econv_append(ec, utf8str, nlen, dst, replaceflags);