static int my_utf8_uni()

in jdbc/driver/mysql_util.cpp [2275:2377]

• 89 lines of code
• 37 McCabe index (conditional complexity)

static int my_utf8_uni(unsigned long * pwc, const unsigned char *s, const unsigned char *e)
{
  unsigned char c;

  if (s >= e)
    return MY_CS_TOOSMALL;

  c= s[0];
  if (c < 0x80)
  {
    *pwc = c;
    return 1;
  }
  else if (c < 0xc2)
    return MY_CS_ILSEQ;
  else if (c < 0xe0)
  {
    if (s+2 > e) /* We need 2 characters */
      return MY_CS_TOOSMALL2;

    if (!((s[1] ^ 0x80) < 0x40))
      return MY_CS_ILSEQ;

    *pwc = ((unsigned long) (c & 0x1f) << 6) | (unsigned long) (s[1] ^ 0x80);
    return 2;
  }
  else if (c < 0xf0)
  {
    if (s+3 > e) /* We need 3 characters */
      return MY_CS_TOOSMALL3;

    if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 &&
          (c >= 0xe1 || s[1] >= 0xa0)))
      return MY_CS_ILSEQ;

    *pwc = ((unsigned long) (c & 0x0f) << 12)	 |
           ((unsigned long) (s[1] ^ 0x80) << 6) |
        (unsigned long) (s[2] ^ 0x80);

    return 3;
  }
#ifdef UNICODE_32BIT
  else if (c < 0xf8 && sizeof(my_wc_t)*8 >= 32)
  {
    if (s+4 > e) /* We need 4 characters */
      return MY_CS_TOOSMALL4;

    if (!((s[1] ^ 0x80) < 0x40 &&
          (s[2] ^ 0x80) < 0x40 &&
          (s[3] ^ 0x80) < 0x40 &&
          (c >= 0xf1 || s[1] >= 0x90)))
      return MY_CS_ILSEQ;

    *pwc = ((unsigned long) (c & 0x07) << 18)		|
           ((unsigned long) (s[1] ^ 0x80) << 12) |
        ((unsigned long) (s[2] ^ 0x80) << 6)	|
        (unsigned long) (s[3] ^ 0x80);

    return 4;
  }
  else if (c < 0xfc && sizeof(my_wc_t)*8 >= 32)
  {
    if (s+5 >e) /* We need 5 characters */
      return MY_CS_TOOSMALL5;

    if (!((s[1] ^ 0x80) < 0x40 &&
          (s[2] ^ 0x80) < 0x40 &&
          (s[3] ^ 0x80) < 0x40 &&
          (s[4] ^ 0x80) < 0x40 &&
          (c >= 0xf9 || s[1] >= 0x88)))
      return MY_CS_ILSEQ;

    *pwc = ((unsigned long) (c & 0x03) << 24) |
           ((unsigned long) (s[1] ^ 0x80) << 18) |
        ((unsigned long) (s[2] ^ 0x80) << 12) |
        ((unsigned long) (s[3] ^ 0x80) << 6) |
        (unsigned long) (s[4] ^ 0x80);
    return 5;
  }
  else if (c < 0xfe && sizeof(my_wc_t)*8 >= 32)
  {
    if ( s+6 >e ) /* We need 6 characters */
      return MY_CS_TOOSMALL6;

    if (!((s[1] ^ 0x80) < 0x40	 &&
          (s[2] ^ 0x80) < 0x40	 &&
          (s[3] ^ 0x80) < 0x40	 &&
          (s[4] ^ 0x80) < 0x40	 &&
          (s[5] ^ 0x80) < 0x40	 &&
          (c >= 0xfd || s[1] >= 0x84)))
      return MY_CS_ILSEQ;

    *pwc = ((unsigned long) (c & 0x01) << 30)
           | ((unsigned long) (s[1] ^ 0x80) << 24)
        | ((unsigned long) (s[2] ^ 0x80) << 18)
        | ((unsigned long) (s[3] ^ 0x80) << 12)
        | ((unsigned long) (s[4] ^ 0x80) << 6)
        | (unsigned long) (s[5] ^ 0x80);
    return 6;
  }
#endif
  return MY_CS_ILSEQ;
}