Method smtpParse

Sming/Components/Network/src/Network/SmtpClient.cpp:369–526

}

int SmtpClient::smtpParse(char* buffer, size_t len)
{
	char* start = buffer;
	while(len) {
		char currentByte = *buffer;
		// parse the code...
		if(codeLength < 3) {
			code[codeLength++] = currentByte;
			ADVANCE;
			continue;
		}

		if(codeLength == 3) {
			code[codeLength] = '\0';
			if(currentByte != ' ' && currentByte != '-') {
				// the code must be followed by space or minus
				return 0;
			}

			codeValue = strtol(code, nullptr, 10);
			isLastLine = (currentByte == ' ');
			codeLength++;
			ADVANCE;
		}

		char* line = buffer;
		ADVANCE_UNTIL_EOL_OR_BREAK;
		codeLength = 0;
		int lineLength = (buffer - line) - 2;

		switch(state) {
		case eSMTP_Banner: {
			RETURN_ON_ERROR(SMTP_CODE_SERVICE_READY);

			if(!useSsl && (options & SMTP_OPT_STARTTLS)) {
				if(!enableSsl(url.Host)) {
					/*
					 * Excerpt from RFC 3207: If,
					 * after having issued the STARTTLS command, the client finds out that
					 * some failure prevents it from actually starting a TLS handshake, then
					 * it SHOULD abort the connection.
					 */
					return 0;
				}
			}

			sendString(F("EHLO ") + url.Host + "\r\n");
			state = eSMTP_Hello;

			break;
		}

		case eSMTP_Hello: {
			RETURN_ON_ERROR(SMTP_CODE_REQUEST_OK);

			if(strncmp(line, _F("PIPELINING"), lineLength) == 0) {
				// PIPELINING (see: https://tools.ietf.org/html/rfc2920)
				options |= SMTP_OPT_PIPELINE;