Function make_null_string

src/common/cvt.cpp:2432–2477

void make_null_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 _ n u l l _ s t r i n g
 *
 **************************************
 *
 * Functional description
 *     Convert the data from the desc to a zero-terminated string.
 *     The pointer to this string is returned in address.
 *	   Data always placed to temp buffer.
 *
 **************************************/
	fb_assert(temp);

	USHORT len = CVT_make_string(desc, to_interp, address, temp, --length, decSt, err);

	if (*address != temp->vary_string)
	{
		length -= sizeof(USHORT);	// Take into an account VaryStr specifics
		if (len > length)
		{
			err(Arg::Gds(isc_arith_except) << Arg::Gds(isc_string_truncation) <<
				Arg::Gds(isc_imp_exc) <<
				Arg::Gds(isc_trunc_limits) << Arg::Num(length) << Arg::Num(len));
		}
		memcpy(temp->vary_string, *address, len);
		temp->vary_length = len;
	}

	fb_assert(temp->vary_length == len);
	temp->vary_string[len] = 0;

	for (USHORT n = 0; n < len; ++n)
	{
		if (!temp->vary_string[n])		// \0 in the middle of a string
			CVT_conversion_error(desc, err);
	}
}


USHORT CVT_make_string(const dsc*    desc,