Function CVT_conversion_error

src/common/cvt.cpp:2198–2284

void CVT_conversion_error(const dsc* desc, ErrorFunction err, const Exception* original)
{
/**************************************
 *
 *      c o n v e r s i o n _ e r r o r
 *
 **************************************
 *
 * Functional description
 *      A data conversion error occurred.  Complain.
 *
 **************************************/
	string message;

	if (desc->dsc_dtype >= DTYPE_TYPE_MAX)
	{
		fb_assert(false);
		err(Arg::Gds(isc_badblk));
	}

	if (desc->dsc_dtype == dtype_blob)
		message = "BLOB";
	else if (desc->dsc_dtype == dtype_array)
		message = "ARRAY";
	else if (desc->dsc_dtype == dtype_boolean)
		message = "BOOLEAN";
	else if (desc->dsc_dtype == dtype_dbkey)
		message = "DBKEY";
	else
	{
		// CVC: I don't have access here to JRD_get_thread_data())->tdbb_status_vector
		// to be able to clear it (I don't want errors appended, but replacing
		// the existing, misleading one). Since localError doesn't fill the thread's
		// status vector as ERR_post would do, our new error is the first and only one.
		// We discard errors from CVT_make_string because we are interested in reporting
		// isc_convert_error, not isc_arith_exception if CVT_make_string fails.
		// If someone finds a better way, these hacks can be deleted.
		// Initially I was trapping here status_exception and testing
		// e.value()[1] == isc_arith_except.

		try
	    {
			const char* p;
			VaryStr<TEMP_STR_LENGTH> s;
			const USHORT length =
				CVT_make_string(desc, ttype_ascii, &p, &s, sizeof(s), 0, localError);
			message.assign(p, length);

			// Convert to \xDD surely non-printable characters
			for (FB_SIZE_T n = 0; n < message.getCount(); ++n)
			{
				if (message[n] < ' ')
				{
					string hex;
					hex.printf("#x%02x", UCHAR(message[n]));
					message.replace(n, 1, hex);
					n += (hex.length() - 1);
				}