SQLLEN c16tombs()

in win_unicode.c [932:984]

• 46 lines of code
• 15 McCabe index (conditional complexity)

SQLLEN	c16tombs(char *c8dt, const char16_t *c16dt, size_t n)
{
	int		i;
	SQLLEN	result = 0;
	size_t	brtn;
	char	*cdt, c4byte[4];
	mbstate_t	mbst = initial_state;

MYLOG(MIN_LOG_LEVEL, " c8dt=%p size=" FORMAT_SIZE_T "u\n", c8dt, n);
	if (!c8dt)
		n = 0;
	for (i = 0, cdt = c8dt; c16dt[i] && (result < n || (!cdt)); i++)
	{
		if (NULL != cdt && result + 4 < n)
			brtn = c16rtomb(cdt, c16dt[i], &mbst);
		else
		{
			brtn = c16rtomb(c4byte, c16dt[i], &mbst);
			if (brtn < 5)
			{
				SQLLEN result_n = result + brtn;

				if (result_n < n)
					memcpy(cdt, c4byte, brtn);
				else
				{
					if (cdt && n > 0)
					{
						c8dt[result] = '\0'; /* truncate */
						return result_n;
					}
				}
			}
		}
		/*
		printf("c16dt=%04X brtn=%lu result=%ld cdt=%02X%02X%02X%02X\n",
			c16dt[i], brtn, result, (UCHAR) cdt[0], (UCHAR) cdt[1], (UCHAR) cdt[2], (UCHAR) cdt[3]);
		*/
		if (brtn == (size_t) -1)
		{
			if (n > 0)
				c8dt[n - 1] = '\0';
			return -1;
		}
		if (cdt)
			cdt += brtn;
		result += brtn;
	}
	if (cdt)
		*cdt = '\0';

	return result;
}