Function hex_to_value

src/common/cvt.cpp:3579–3626

static void hex_to_value(const char*& string, const char* end, RetPtr* retValue)
/*************************************
 *
 *      hex_to_value
 *
 *************************************
 *
 * Functional description
 *      Convert a hex string to a numeric value. This code only
 *      converts a hex string into a numeric value, and the
 *      size of biggest hex string depends upon RetPtr.
 *
 *************************************/
{
	// we already know this is a hex string, and there is no prefix.
	// So, string is something like DEADBEEF.

	UCHAR byte = 0;
	int nibble = ((end - string) & 1);
	char ch;

	while ((string < end) && ((DIGIT((ch = UPPER(*string)))) || ((ch >= 'A') && (ch <= 'F'))))
	{
		// Now convert the character to a nibble
		SSHORT c;

		if (ch >= 'A')
			c = (ch - 'A') + 10;
		else
			c = (ch - '0');

		if (nibble)
		{
			byte = (byte << 4) + (UCHAR) c;
			nibble = 0;
			retValue->nextDigit(byte, 256);
		}
		else
		{
			byte = c;
			nibble = 1;
		}

		++string;
	}

	fb_assert(string <= end);
}


static void localError(const Firebird::Arg::StatusVector&)