src/ces_big5.h

/*
 * BIG-5
 */

static int
ces_big5_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
{
  unsigned char c = *s;
  /* Code set 0 (ASCII) */
  if (c < 0x80)
    return ascii_mbtowc(conv,pwc,s,n);
  /* Code set 1 (BIG5) */
  if (c >= 0xa1 && c < 0xff) {
    if (n < 2)
      return RET_TOOFEW(0);
    {
      unsigned char c2 = s[1];
      if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff))
        return big5_mbtowc(conv,pwc,s,2);
      else
        return RET_ILSEQ;
    }
  }
  return RET_ILSEQ;
}

static int
ces_big5_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
{
  unsigned char buf[2];
  int ret;

  /* Code set 0 (ASCII) */
  ret = ascii_wctomb(conv,r,wc,n);
  if (ret != RET_ILSEQ)
    return ret;

  /* Code set 1 (BIG5) */
  ret = big5_wctomb(conv,buf,wc,2);
  if (ret != RET_ILSEQ) {
    if (ret != 2) abort();
    if (n < 2)
      return RET_TOOSMALL;
    r[0] = buf[0];
    r[1] = buf[1];
    return 2;
  }

  return RET_ILSEQ;
}