Function CVT_make_string

src/common/cvt.cpp:2480–2541

USHORT CVT_make_string(const dsc*    desc,
					   USHORT        to_interp,
					   const char**  address,
					   vary*         temp,
					   USHORT        length,
					   DecimalStatus decSt,
					   ErrorFunction err)
{
/**************************************
 *
 *      C V T _ m a k e _ s t r i n g
 *
 **************************************
 *
 * Functional description
 *     Convert the data from the desc to a string in the specified interp.
 *     The pointer to this string is returned in address.
 *
 **************************************/
	fb_assert(desc != NULL);
	fb_assert(address != NULL);
	fb_assert(err != NULL);

	const USHORT from_interp = INTL_TTYPE(desc);

	const bool simple_return = desc->isText() &&
		(from_interp == to_interp || to_interp == ttype_none || to_interp == ttype_binary);

	fb_assert((temp != NULL && length > 0) || simple_return);

	if (simple_return)
	{
		*address = reinterpret_cast<char*>(desc->dsc_address);
		const USHORT from_len = desc->dsc_length;

		if (desc->dsc_dtype == dtype_text)
			return from_len;

		if (desc->dsc_dtype == dtype_cstring)
			return MIN((USHORT) strlen((char *) desc->dsc_address), from_len - 1);

		if (desc->dsc_dtype == dtype_varying)
		{
			vary* varying = (vary*) desc->dsc_address;
			*address = varying->vary_string;
			return MIN(varying->vary_length, (USHORT) (from_len - sizeof(USHORT)));
		}
	}

	// Not string data, then  -- convert value to varying string.

	dsc temp_desc;
	MOVE_CLEAR(&temp_desc, sizeof(temp_desc));
	temp_desc.dsc_length = length;
	temp_desc.dsc_address = (UCHAR *) temp;
	temp_desc.dsc_dtype = dtype_varying;
	temp_desc.setTextType(to_interp);
	CVT_move(desc, &temp_desc, decSt, err);