Method DescPrinter

src/jrd/mov.cpp:491–552

{

DescPrinter::DescPrinter(thread_db* tdbb, const dsc* desc, FB_SIZE_T mLen, USHORT charSetId)
	: maxLen(mLen)
{
	const char* const NULL_KEY_STRING = "NULL";

	if (!desc)
	{
		value = NULL_KEY_STRING;
		return;
	}

	fb_assert(!desc->isBlob());

	const bool isBinary = (desc->isText() && desc->getCharSet() == CS_BINARY);
	value = MOV_make_string2(tdbb, desc, isBinary ? CS_BINARY : charSetId);

	const char* const str = value.c_str();

	if (desc->isText() || desc->isDateTime())
	{
		if (desc->dsc_dtype == dtype_text)
		{
			const char* const pad = (desc->getCharSet() == CS_BINARY) ? "\0" : " ";
			value.rtrim(pad);
		}

		if (isBinary)
		{
			string hex;

			FB_SIZE_T len = value.length();
			const bool cut = (len > (maxLen - 3) / 2);	// 3 is a length of enclosing symbols: x' and '
			if (cut)
				len = (maxLen - 5) / 2;					// 5 is a length of enclosing symbols: x' and ...

			char* s = hex.getBuffer(2 * len);			// each raw byte represented by 2 chars in string

			for (FB_SIZE_T i = 0; i < len; i++)
			{
				sprintf(s, "%02X", (int)(unsigned char) str[i]);
				s += 2;
			}
			value = "x'" + hex + (cut ? "..." : "'");
		}
		else
			value = "'" + value + "'";
	}

	if (value.length() > maxLen)
	{
		fb_assert(desc->isText());

		value.resize(maxLen);

		const CharSet* const cs = INTL_charset_lookup(tdbb, charSetId);

		while (value.hasData() && !cs->wellFormed(value.length(), (const UCHAR*) value.c_str()))
			value.resize(value.length() - 1);