Function safe_interpret

src/yvalve/gds.cpp:829–1033

safe_interpret @brief Translate a status code with arguments to a string. Return the length of the string while updating the vector address. If the message is null (end of messages) or invalid, return 0; @param s the output buffer where a human readable version of the error is put @param bufsize the size of the output buffer @param vector the input, the address of const pointer to the st

**/
static SLONG safe_interpret(char* const s, const FB_SIZE_T bufsize,
	const ISC_STATUS** const vector, bool legacy)
{
	// CVC: It doesn't make sense to provide a buffer smaller than 50 bytes.
	// Return error otherwise.
	if (bufsize < 50)
		return 0;

	// Skip the SQLSTATE
	if ((*vector)[0] == isc_arg_sql_state)
		*vector += 2;

	// If the first element of the vector doesn't signal an error, return.
	if (!**vector)
		return 0;

	const ISC_STATUS* v;
	ISC_STATUS code;
	// Handle a case: "no errors, some warning(s)"
	if ((*vector)[1] == 0 && (*vector)[2] == isc_arg_warning)
	{
		v = *vector + 4;
		code = (*vector)[3];
	}
	else
	{
		v = *vector + 2;
		code = (*vector)[1];
	}

	const TEXT* args[10];
	const TEXT** arg = args;
	const char* const* const argend = arg + FB_NELEM(args);

	MsgFormat::SafeArg safe;

	// Parse and collect any arguments that may be present

	TEXT* p = 0;
	const TEXT* q;
	int temp_len = BUFFER_SMALL;
	TEXT* temp = NULL;

	for (;;)
	{
		// CVC: Close overflow in "args".
		if (arg >= argend)
			break;

		int len;
		const UCHAR x = (UCHAR) *v++;
		switch (x)
		{
		case isc_arg_string:
			*arg++ = (TEXT*) *v;
			safe << (TEXT*) *v;
			++v;
			continue;