int ucs4_to_ucs2_lf()

in win_unicode.c [674:729]

• 50 lines of code
• 14 McCabe index (conditional complexity)

int ucs4_to_ucs2_lf(const unsigned int *ucs4str, SQLLEN ilen, SQLWCHAR *ucs2str, int bufcount, BOOL lfconv)
{
	int outlen = 0, i;
	UCHAR		*ucdt;
	SQLWCHAR	*sqlwdt, dmy_wchar;
	UCHAR * const udt = (UCHAR *) &dmy_wchar;
	unsigned int	uintdt;

MYLOG(MIN_LOG_LEVEL, " ilen=" FORMAT_LEN " bufcount=%d\n", ilen, bufcount);
	if (ilen < 0)
		ilen = ucs4strlen(ucs4str);
	for (i = 0; i < ilen && (uintdt = ucs4str[i]); i++)
	{
		sqlwdt = (SQLWCHAR *)&uintdt;
		ucdt = (UCHAR *)&uintdt;
		if (0 == sqlwdt[1])
		{
			if (lfconv && PG_LINEFEED == ucdt[0] &&
				(i == 0 ||
					PG_CARRIAGE_RETURN != *((UCHAR *)&ucs4str[i - 1]))
				)
			{
				if (outlen < bufcount)
				{
					udt[0] = PG_CARRIAGE_RETURN;
					udt[1] = 0;
					ucs2str[outlen] = *((SQLWCHAR *) udt);
				}
				outlen++;
			}
			if (outlen < bufcount)
				ucs2str[outlen] = sqlwdt[0];
			outlen++;
			continue;
		}
		sqlwdt[1]--;
		udt[0] = ((0xfc & ucdt[1]) >> 2) | ((0x3 & ucdt[2]) << 6);
		//	printf("%02x", udt[0]);
		udt[1] = SURROG1_BYTE | ((0xc & ucdt[2]) >> 2);
		//	printf("%02x", udt[1]);
		if (outlen < bufcount)
			ucs2str[outlen] = *((SQLWCHAR *)udt);
		outlen++;
		udt[0] = ucdt[0];
		//	printf("%02x", udt[0]);
		udt[1] = SURROG2_BYTE | (0x3 & ucdt[1]);
		//	printf("%02x\n", udt[1]);
		if (outlen < bufcount)
			ucs2str[outlen] = *((SQLWCHAR *)udt);
		outlen++;
	}
	if (outlen < bufcount)
		ucs2str[outlen] = 0;

	return outlen;
}