C++ string::copyTo方法代码示例

// Lookup and format message.  Return as much of formatted string as fits in caller's buffer.
int fb_msg_format(void* handle, USHORT facility, USHORT number, unsigned int bsize, TEXT* buffer,
	const MsgFormat::SafeArg& arg)
{
	// The field MESSAGES.TEXT is 118 bytes long.
	int total_msg = 0;
	char msg[120] = "";
	const int n = gds__msg_lookup(handle, facility, number, sizeof(msg), msg, NULL);

	if (n > 0 && unsigned(n) < sizeof(msg))
	{
		// Shameful bridge, gds__msg_format emulation for old format messages.
		if (strchr(msg, '%'))
		{
			const TEXT* rep[5];
			arg.dump(rep, 5);
			total_msg = fb_utils::snprintf(buffer, bsize, msg, rep[0], rep[1], rep[2], rep[3], rep[4]);
		}
		else
			total_msg = MsgPrint(buffer, bsize, msg, arg);
	}
	else
	{
		Firebird::string s;
		s.printf("can't format message %d:%d -- ", facility, number);
		if (n == -1)
			s += "message text not found";
		else if (n == -2)
		{
			s += "message file ";
			s += fb_utils::getPrefix(Firebird::DirType::FB_DIR_MSG, MSG_FILE).ToString();
			s += " not found";
		}
		else
		{
			fb_utils::snprintf(buffer, bsize, "message system code %d", n);
			s += buffer;
		}
		total_msg = s.copyTo(buffer, bsize);
	}

	return (n > 0 ? total_msg : -total_msg);
}

// fetch password from file
FetchPassResult fetchPassword(const Firebird::PathName& name, const char*& password)
{
	InputFile file(name);
	if (!file)
	{
		return FETCH_PASS_FILE_OPEN_ERROR;
	}

	Firebird::string pwd;
	if (! pwd.LoadFromFile(file.getStdioFile()))
	{
		return ferror(file.getStdioFile()) ? FETCH_PASS_FILE_READ_ERROR : FETCH_PASS_FILE_EMPTY;
	}

	// this is planned leak of a few bytes of memory in utilities
	char* pass = FB_NEW_POOL(*getDefaultMemoryPool()) char[pwd.length() + 1];
	pwd.copyTo(pass, pwd.length() + 1);
	password = pass;
	return FETCH_PASS_OK;
}

	void CryptoManager::changeCryptState(thread_db* tdbb, const Firebird::string& plugName)
	{
		if (plugName.length() > 31)
		{
			(Arg::Gds(isc_cp_name_too_long) << Arg::Num(31)).raise();
		}

		bool newCryptState = plugName.hasData();

		{	// window scope
			Header hdr(tdbb, LCK_write);

			// Check header page for flags
			if (hdr->hdr_flags & Ods::hdr_crypt_process)
			{
				(Arg::Gds(isc_cp_process_active)).raise();
			}

			bool headerCryptState = hdr->hdr_flags & Ods::hdr_encrypted;
			if (headerCryptState == newCryptState)
			{
				(Arg::Gds(isc_cp_already_crypted)).raise();
			}

			fb_assert(stateLock);
			// Take exclusive stateLock
			bool ret = needLock ? LCK_lock(tdbb, stateLock, LCK_PW, LCK_WAIT) :
								  LCK_convert(tdbb, stateLock, LCK_PW, LCK_WAIT);
			if (!ret)
			{
				fb_assert(tdbb->tdbb_status_vector[1]);
				ERR_punt();
			}
			fb_utils::init_status(tdbb->tdbb_status_vector);
			needLock = false;

			// Load plugin
			if (newCryptState)
			{
				loadPlugin(plugName.c_str());
			}
			crypt = newCryptState;

			// Write modified header page
			Ods::header_page* header = hdr.write();
			if (crypt)
			{
				header->hdr_flags |= Ods::hdr_encrypted;
				plugName.copyTo(header->hdr_crypt_plugin, sizeof header->hdr_crypt_plugin);
			}
			else
			{
				header->hdr_flags &= ~Ods::hdr_encrypted;
			}
			header->hdr_flags |= Ods::hdr_crypt_process;
			process = true;
		}

		// Trigger lock on ChangeCryptState
		if (!LCK_convert(tdbb, stateLock, LCK_EX, LCK_WAIT))
		{
			ERR_punt();
		}

		if (!LCK_convert(tdbb, stateLock, LCK_SR, LCK_WAIT))
		{
			ERR_punt();
		}
		fb_utils::init_status(tdbb->tdbb_status_vector);

		// Now we may set hdr_crypt_page for crypt thread
		{	// window scope
			Header hdr(tdbb, LCK_write);
			Ods::header_page* header = hdr.write();
			header->hdr_crypt_page = 1;
		}

		startCryptThread(tdbb);
	}