int ucs2_to_ucs4()

in win_unicode.c [731:774]

• 38 lines of code
• 8 McCabe index (conditional complexity)

int ucs2_to_ucs4(const SQLWCHAR *ucs2str, SQLLEN ilen, unsigned int *ucs4str, int bufcount)
{
	int			outlen = 0, i;
	UCHAR		*ucdt;
	SQLWCHAR	sqlwdt;
	unsigned int	dmy_uint;
	UCHAR * const udt = (UCHAR *) &dmy_uint;

MYLOG(MIN_LOG_LEVEL, " ilen=" FORMAT_LEN " bufcount=%d\n", ilen, bufcount);
	if (ilen < 0)
		ilen = ucs2strlen(ucs2str);
	udt[3] = 0;	/* always */
	for (i = 0; i < ilen && (sqlwdt = ucs2str[i]); i++)
	{
		ucdt = (UCHAR *)(ucs2str + i);
		//	printf("IN=%x\n", sqlwdt);
		if ((ucdt[1] & SURROGATE_CHECK) != SURROG1_BYTE)
		{
			//	printf("SURROG1=%2x\n", ucdt[1] & SURROG1_BYTE);
			if (outlen < bufcount)
			{
				udt[0] = ucdt[0];
				udt[1] = ucdt[1];
				udt[2] = 0;
				ucs4str[outlen] = *((unsigned int *)udt);
			}
			outlen++;
			continue;
		}
		/* surrogate pair */
		udt[0] = ucdt[2];
		udt[1] = (ucdt[3] & 0x3) | ((ucdt[0] & 0x3f) << 2);
		udt[2] = (((ucdt[0] & 0xc0) >> 6) | ((ucdt[1] & 0x3) << 2)) + 1;
		// udt[3] = 0; needless
		if (outlen < bufcount)
			ucs4str[outlen] = *((unsigned int *)udt);
		outlen++;
		i++;
	}
	if (outlen < bufcount)
		ucs4str[outlen] = 0;

	return outlen;
}