utf8_to_big5
n = utf8_to_big5(unidx, big5code,
static int utf8_to_big5(int, unsigned long, char *, size_t, int *);
outbytesleft, errno, utf8_to_big5);
(uchar_t *)outarray, outlen, flag, errno, utf8_to_big5);
static int8_t utf8_to_big5(uint32_t utf8, uchar_t **inbuf, uchar_t *ibtail,