C++ string::isEmpty方法代码示例

static void stuff_stack_trace(const jrd_req* request)
{
	Firebird::string sTrace;
	bool isEmpty = true;

	for (const jrd_req* req = request; req; req = req->req_caller)
	{
		const JrdStatement* statement = req->getStatement();
		Firebird::string name;

		if (statement->triggerName.length())
		{
			name = "At trigger '";
			name += statement->triggerName.c_str();
		}
		else if (statement->procedure)
		{
			name = statement->parentStatement ? "At sub procedure '" : "At procedure '";
			name += statement->procedure->getName().toString().c_str();
		}
		else if (statement->function)
		{
			name = statement->parentStatement ? "At sub function '" : "At function '";
			name += statement->function->getName().toString().c_str();
		}

		if (! name.isEmpty())
		{
			name.trim();

			if (sTrace.length() + name.length() + 2 > MAX_STACK_TRACE)
				break;

			if (isEmpty)
			{
				isEmpty = false;
				sTrace += name + "'";
			}
			else {
				sTrace += "\n" + name + "'";
			}

			if (req->req_src_line)
			{
				Firebird::string src_info;
				src_info.printf(" line: %"ULONGFORMAT", col: %"ULONGFORMAT,
								req->req_src_line, req->req_src_column);

				if (sTrace.length() + src_info.length() > MAX_STACK_TRACE)
					break;

				sTrace += src_info;
			}
		}
	}

	if (!isEmpty)
		ERR_post_nothrow(Arg::Gds(isc_stack_trace) << Arg::Str(sTrace));
}

//.........这里部分代码省略.........
	}

	if (userData.database.entered()) {
		stuffSpb2(spb, isc_spb_dbname, userData.database.get());
	}

	fb_assert((size_t)(spb - spb_buffer) <= sizeof(spb_buffer));
	if (isc_service_start(status, &handle, 0, static_cast<USHORT>(spb - spb_buffer), spb_buffer) != 0)
	{
		return;
	}

	spb = spb_buffer;
	stuffSpbByte(spb, isc_info_svc_timeout);
	stuffSpbShort(spb, 4);
	stuffSpbLong(spb, 10);

	char resultBuffer[RESULT_BUF_SIZE + 4];
	Firebird::string text;

	ISC_STATUS_ARRAY temp_status;
	ISC_STATUS* local_status = status[1] ? temp_status : status;
	fb_utils::init_status(local_status);

	if (op == Auth::DIS_OPER || op == Auth::OLD_DIS_OPER)
	{
		const char request[] = {isc_info_svc_get_users};
		int startQuery = 0;
		Auth::StackUserData uData;

		for (;;)
		{
			isc_resv_handle reserved = 0;
			isc_service_query(local_status, &handle, &reserved, static_cast<USHORT>(spb - spb_buffer), spb_buffer,
				sizeof(request), request, RESULT_BUF_SIZE - startQuery, &resultBuffer[startQuery]);
			if (local_status[1])
			{
				return;
			}
			startQuery = typeBuffer(local_status, resultBuffer, startQuery, uData, callback, text);
			if (startQuery < 0)
			{
				break;
			}
		}

		if (uData.user.get()[0] && callback)
		{
			LocalStatus status;
			CheckStatusWrapper statusWrapper(&status);

			setAttr(&statusWrapper, &uData);
			check(&statusWrapper);
			callback->list(&statusWrapper, &uData);
			check(&statusWrapper);
		}
	}
	else
	{
		const char request = isc_info_svc_line;
		for (;;)
		{
			isc_resv_handle reserved = 0;
			isc_service_query(local_status, &handle, &reserved, 0, NULL,
				1, &request, RESULT_BUF_SIZE, resultBuffer);
			if (local_status[1])
			{
				return;
			}
			char *p = resultBuffer;
			if (*p++ == isc_info_svc_line)
			{
				FB_SIZE_T len = static_cast<FB_SIZE_T>(isc_vax_integer(p, sizeof(USHORT)));
				p += sizeof(USHORT);
				if (len > RESULT_BUF_SIZE)
				{
					len = RESULT_BUF_SIZE;
				}
				if (!len)
				{
					if (*p == isc_info_data_not_ready)
						continue;
					if (*p == isc_info_end)
						break;
				}
				p[len] = 0;
				text += p;
			}
		}

	}

	if (! text.isEmpty())
	{
		local_status[0] = isc_arg_interpreted;
		// strdup - memory leak in case of errors
		local_status[1] = reinterpret_cast<ISC_STATUS>(strdup(text.c_str()));
		local_status[2] = isc_arg_end;
	}
}

SINT64 ConfigFile::Parameter::asInteger() const
{
	if (value.isEmpty())
		return 0;

	SINT64 ret = 0;
	int sign = 1;
	int state = 1; // 1 - sign, 2 - numbers, 3 - multiplier

	Firebird::string trimmed = value;
	trimmed.trim(" \t");

	if (trimmed.isEmpty())
		return 0;

	const char* ch = trimmed.c_str();
	for (; *ch; ch++)
		switch (*ch)
		{
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			if (state > 2)
				return 0;
			state = 2;

			ret = ret * 10 + (*ch - '0');
			break;

		case '-':
			if (state > 1)
				return 0;

			sign = -sign;
			break;

		case ' ': case '\t':
			if (state == 1)
				break;
			return 0;

		case 'k': case 'K':
			if (state != 2)
				return 0;
			state = 3;

			ret = ret * 1024;
			break;

		case 'm': case 'M':
			if (state != 2)
				return 0;
			state = 3;

			ret = ret * 1024 * 1024;
			break;

		case 'g': case 'G':
			if (state != 2)
				return 0;
			state = 3;

			ret = ret * 1024 * 1024 * 1024;
			break;

		default:
			return 0;
		};

	return sign * ret;
}

void EVL_validate(thread_db* tdbb, const Item& item, const ItemInfo* itemInfo, dsc* desc, bool null)
{
/**************************************
 *
 *	E V L _ v a l i d a t e
 *
 **************************************
 *
 * Functional description
 *	Validate argument/variable for not null and check constraint
 *
 **************************************/
	if (itemInfo == NULL)
		return;

	jrd_req* request = tdbb->getRequest();
	bool err = false;

	if (null && !itemInfo->nullable)
		err = true;

	const char* value = NULL_STRING_MARK;
	VaryStr<128> temp;

	MapFieldInfo::ValueType fieldInfo;
	if (!err && itemInfo->fullDomain &&
		request->getStatement()->mapFieldInfo.get(itemInfo->field, fieldInfo) &&
		fieldInfo.validationExpr)
	{
		if (desc && null)
			desc->dsc_flags |= DSC_null;

		const bool desc_is_null = !desc || (desc->dsc_flags & DSC_null);

		request->req_domain_validation = desc;
		const USHORT flags = request->req_flags;

		if (!fieldInfo.validationExpr->execute(tdbb, request) && !(request->req_flags & req_null))
		{
			const USHORT length = desc_is_null ? 0 :
				MOV_make_string(desc, ttype_dynamic, &value, &temp, sizeof(temp) - 1);

			if (desc_is_null)
				value = NULL_STRING_MARK;
			else if (!length)
				value = "";
			else
				const_cast<char*>(value)[length] = 0;	// safe cast - data is on our local stack

			err = true;
		}

		request->req_flags = flags;
	}

	Firebird::string s;

	if (err)
	{
		ISC_STATUS status = isc_not_valid_for_var;
		const char* arg;

		if (item.type == Item::TYPE_CAST)
		{
			status = isc_not_valid_for;
			arg = "CAST";
		}
		else
		{
			if (itemInfo->name.isEmpty())
			{
				int index = item.index + 1;

				status = isc_not_valid_for;

				if (item.type == Item::TYPE_VARIABLE)
				{
					const jrd_prc* procedure = request->getStatement()->procedure;

					if (procedure)
					{
						if (index <= int(procedure->getOutputFields().getCount()))
							s.printf("output parameter number %d", index);
						else
						{
							s.printf("variable number %d",
								index - int(procedure->getOutputFields().getCount()));
						}
					}
					else
						s.printf("variable number %d", index);
				}
				else if (item.type == Item::TYPE_PARAMETER && item.subType == 0)
					s.printf("input parameter number %d", (index - 1) / 2 + 1);
				else if (item.type == Item::TYPE_PARAMETER && item.subType == 1)
					s.printf("output parameter number %d", index);

				if (s.isEmpty())
					arg = UNKNOWN_STRING_MARK;
				else
//.........这里部分代码省略.........