serviceinterface/ServiceInterfaceBuffer.cpp

@@ -1,11 +1,58 @@
 #include <framework/timemanager/Clock.h>
 #include <framework/serviceinterface/ServiceInterfaceBuffer.h>
 #include <cstring>
+#include <inttypes.h>
 
 // to be implemented by bsp
-extern "C" void printChar(const char*);
+extern "C" void printChar(const char*, bool errStream);
+
+#ifndef UT699
+
+ServiceInterfaceBuffer::ServiceInterfaceBuffer(std::string setMessage,
+		bool addCrToPreamble, bool buffered , bool errStream, uint16_t port):
+		isActive(true), logMessage(setMessage),
+		addCrToPreamble(addCrToPreamble), buffered(buffered),
+		errStream(errStream) {
+	if(buffered) {
+		// Set pointers if the stream is buffered.
+		setp( buf, buf + BUF_SIZE );
+	}
+	preamble.reserve(MAX_PREAMBLE_SIZE);
+	preamble.resize(MAX_PREAMBLE_SIZE);
+}
+
+void ServiceInterfaceBuffer::putChars(char const* begin, char const* end) {
+	char array[BUF_SIZE];
+	uint32_t length = end - begin;
+	if (length > sizeof(array)) {
+		length = sizeof(array);
+	}
+	memcpy(array, begin, length);
+
+	for(; begin != end; begin++){
+		if(errStream) {
+			printChar(begin, true);
+		}
+		else {
+			printChar(begin, false);
+		}
+	}
+}
+
+#endif
 
 int ServiceInterfaceBuffer::overflow(int c) {
+	if(not buffered and this->isActive) {
+		if (c != Traits::eof()) {
+			if(errStream) {
+				printChar(reinterpret_cast<const char*>(&c), true);
+			}
+			else {
+				printChar(reinterpret_cast<const char*>(&c), false);
+			}
+		}
+		return 0;
+	}
 	// Handle output
 	putChars(pbase(), pptr());
 	if (c != Traits::eof()) {
@@ -20,52 +67,70 @@ int ServiceInterfaceBuffer::overflow(int c) {
 }
 
 int ServiceInterfaceBuffer::sync(void) {
-	if (this->isActive) {
-		Clock::TimeOfDay_t loggerTime;
-		Clock::getDateAndTime(&loggerTime);
-		char preamble[96] = { 0 };
-		sprintf(preamble, "%s: | %lu:%02lu:%02lu.%03lu | ",
-				this->log_message.c_str(), (unsigned long) loggerTime.hour,
-				(unsigned long) loggerTime.minute,
-				(unsigned long) loggerTime.second,
-				(unsigned long) loggerTime.usecond /1000);
-		// Write log_message and time
-		this->putChars(preamble, preamble + sizeof(preamble));
-		// Handle output
-		this->putChars(pbase(), pptr());
+	if(not this->isActive and not buffered) {
+		if(not buffered) {
+			setp(buf, buf + BUF_SIZE - 1);
+		}
+		return 0;
 	}
+	if(not buffered) {
+		return 0;
+	}
+
+	size_t preambleSize  = 0;
+	auto preamble = getPreamble(&preambleSize);
+	// Write logMessage and time
+	this->putChars(preamble.data(), preamble.data() + preambleSize);
+	// Handle output
+	this->putChars(pbase(), pptr());
 	// This tells that buffer is empty again
 	setp(buf, buf + BUF_SIZE - 1);
 	return 0;
 }
 
-#ifndef UT699
-
-ServiceInterfaceBuffer::ServiceInterfaceBuffer(std::string set_message, uint16_t port) {
-	this->log_message = set_message;
-	this->isActive = true;
-	setp( buf, buf + BUF_SIZE );
+bool ServiceInterfaceBuffer::isBuffered() const {
+	return buffered;
 }
 
-void ServiceInterfaceBuffer::putChars(char const* begin, char const* end) {
-	char array[BUF_SIZE];
-	uint32_t length = end - begin;
-	if (length > sizeof(array)) {
-		length = sizeof(array);
+std::string ServiceInterfaceBuffer::getPreamble(size_t * preambleSize) {
+	Clock::TimeOfDay_t loggerTime;
+	Clock::getDateAndTime(&loggerTime);
+	size_t currentSize = 0;
+	char* parsePosition = &preamble[0];
+	if(addCrToPreamble) {
+		preamble[0] = '\r';
+		currentSize += 1;
+		parsePosition += 1;
 	}
-	memcpy(array, begin, length);
-
-	for( ; begin != end; begin++){
-		printChar(begin);
+	int32_t charCount = sprintf(parsePosition,
+			"%s: | %02" SCNu32 ":%02" SCNu32 ":%02" SCNu32 ".%03" SCNu32 " | ",
+					this->logMessage.c_str(), loggerTime.hour,
+					loggerTime.minute,
+					loggerTime.second,
+					loggerTime.usecond /1000);
+	if(charCount < 0) {
+		printf("ServiceInterfaceBuffer: Failure parsing preamble\r\n");
+		return "";
 	}
-
+	if(charCount > MAX_PREAMBLE_SIZE) {
+		printf("ServiceInterfaceBuffer: Char count too large for maximum "
+				"preamble size");
+		return "";
+	}
+	currentSize += charCount;
+	if(preambleSize != nullptr) {
+		*preambleSize = currentSize;
+	}
+	return preamble;
 }
-#endif
+
+
 
 #ifdef UT699
 #include <framework/osal/rtems/Interrupt.h>
 
-ServiceInterfaceBuffer::ServiceInterfaceBuffer(std::string set_message, uint16_t port) {
+ServiceInterfaceBuffer::ServiceInterfaceBuffer(std::string set_message,
+		uint16_t port) {
 	this->log_message = set_message;
 	this->isActive = true;
 	setp( buf, buf + BUF_SIZE );

serviceinterface/ServiceInterfaceBuffer.h

@@ -1,51 +1,71 @@
 #ifndef FRAMEWORK_SERVICEINTERFACE_SERVICEINTERFACEBUFFER_H_
 #define FRAMEWORK_SERVICEINTERFACE_SERVICEINTERFACEBUFFER_H_
 
+#include <framework/returnvalues/HasReturnvaluesIF.h>
 #include <iostream>
-#include <iosfwd>
 #include <sstream>
-#include <cstdio>
+#include <iomanip>
 
 #ifndef UT699
-class ServiceInterfaceBuffer: public std::basic_streambuf<char,
-		std::char_traits<char> > {
+
+/**
+ * @brief 	This is the underlying stream buffer which implements the
+ * 			streambuf class and overloads the overflow() and sync() methods
+ * @details
+ * This class is used to modify the output of the stream, for example by adding.
+ * It also calls the char printing function which is implemented in the
+ * board supply package (BSP).
+ */
+class ServiceInterfaceBuffer:
+        public std::streambuf {
 	friend class ServiceInterfaceStream;
 public:
-	ServiceInterfaceBuffer(std::string set_message, uint16_t port);
+	static constexpr uint8_t MAX_PREAMBLE_SIZE = 40;
+
+	ServiceInterfaceBuffer(std::string setMessage, bool addCrToPreamble,
+			bool buffered, bool errStream, uint16_t port);
+
 protected:
 	bool isActive;
-	// This is called when buffer becomes full. If
-	// buffer is not used, then this is called every
-	// time when characters are put to stream.
-	virtual int overflow(int c = Traits::eof());
+	//! This is called when buffer becomes full. If
+	//! buffer is not used, then this is called every
+	//! time when characters are put to stream.
+	int overflow(int c = Traits::eof()) override;
 
-	// This function is called when stream is flushed,
-	// for example when std::endl is put to stream.
-	virtual int sync(void);
+	//! This function is called when stream is flushed,
+	//! for example when std::endl is put to stream.
+	int sync(void) override;
 
+	bool isBuffered() const;
 private:
-	// For additional message information
-	std::string log_message;
+	//! For additional message information
+	std::string logMessage;
+	std::string preamble;
 	// For EOF detection
 	typedef std::char_traits<char> Traits;
 
-	// Work in buffer mode. It is also possible to work without buffer.
+	//! This is useful for some terminal programs which do not have
+	//! implicit carriage return with newline characters.
+	bool addCrToPreamble;
+
+	//! Specifies whether the stream operates in buffered or unbuffered mode.
+	bool buffered;
+	//! This specifies to print to stderr and work in unbuffered mode.
+	bool errStream;
+
+	//! Needed for buffered mode.
 	static size_t const BUF_SIZE = 128;
 	char buf[BUF_SIZE];
 
-	// In this function, the characters are parsed.
+	//! In this function, the characters are parsed.
 	void putChars(char const* begin, char const* end);
+
+	std::string getPreamble(size_t * preambleSize = nullptr);
 };
+
 #endif
 
 
-
-
-
-
-
-
-
 #ifdef UT699
 class ServiceInterfaceBuffer: public std::basic_streambuf<char,
 		std::char_traits<char> > {

serviceinterface/ServiceInterfaceStream.cpp

@@ -1,11 +1,32 @@
 #include <framework/serviceinterface/ServiceInterfaceStream.h>
 
+ServiceInterfaceStream::ServiceInterfaceStream(std::string setMessage,
+		bool addCrToPreamble, bool buffered, bool errStream, uint16_t port) :
+		std::ostream(&streambuf),
+		streambuf(setMessage, addCrToPreamble, buffered, errStream, port) {}
+
 void ServiceInterfaceStream::setActive( bool myActive) {
-	this->buf.isActive = myActive;
+	this->streambuf.isActive = myActive;
 }
 
-ServiceInterfaceStream::ServiceInterfaceStream(std::string set_message,
-		uint16_t port) :
-		std::basic_ostream<char, std::char_traits<char> >(&buf), buf(
-				set_message, port) {
+std::string ServiceInterfaceStream::getPreamble() {
+	return streambuf.getPreamble();
+}
+
+void ServiceInterfaceStream::print(std::string error,
+		bool withPreamble, bool withNewline, bool flush) {
+	if(not streambuf.isBuffered() and withPreamble) {
+		*this << getPreamble() << error;
+	}
+	else {
+		*this << error;
+	}
+
+	if(withNewline) {
+		*this << "\n";
+	}
+	// if mode is non-buffered, no need to flush.
+	if(flush and streambuf.isBuffered()) {
+		this->flush();
+	}
 }

serviceinterface/ServiceInterfaceStream.h

@@ -3,28 +3,56 @@
 
 #include <framework/serviceinterface/ServiceInterfaceBuffer.h>
 #include <iostream>
-#include <iosfwd>
-#include <sstream>
 #include <cstdio>
 
-// Unfortunately, there must be a forward declaration of log_fe
-// (MUST be defined in main), to let the system know where to write to.
-namespace sif {
-extern std::ostream debug;
-extern std::ostream info;
-extern std::ostream warning;
-extern std::ostream error;
-}
-
-
-class ServiceInterfaceStream : public std::basic_ostream< char, std::char_traits< char > > {
-protected:
-    ServiceInterfaceBuffer buf;
+/**
+ * Generic service interface stream which can be used like std::cout or
+ * std::cerr but has additional capability. Add preamble and timestamp
+ * to output. Can be run in buffered or unbuffered mode.
+ */
+class ServiceInterfaceStream : public std::ostream {
 public:
-    ServiceInterfaceStream( std::string set_message, uint16_t port = 1234 );
+	/**
+	 * This constructor is used by specifying the preamble message.
+	 * Optionally, the output can be directed to stderr and a CR character
+	 * can be prepended to the preamble.
+	 * @param setMessage message of preamble.
+	 * @param addCrToPreamble Useful for applications like Puttty.
+	 * @param buffered specify whether to use buffered mode.
+	 * @param errStream specify which output stream to use (stderr or stdout).
+	 */
+	ServiceInterfaceStream(std::string setMessage,
+			bool addCrToPreamble = false, bool buffered = true,
+			bool errStream = false, uint16_t port = 1234);
+
+	//! An inactive stream will not print anything.
 	void setActive( bool );
+
+	/**
+	 * This can be used to retrieve the preamble in case it should be printed in
+	 * the unbuffered mode.
+	 * @return Preamle consisting of log message and timestamp.
+	 */
+	std::string getPreamble();
+
+	/**
+	 * This prints an error with a preamble. Useful if using the unbuffered
+	 * mode. Flushes in default mode (prints immediately).
+	 */
+	void print(std::string error, bool withPreamble = true,
+			bool withNewline = true, bool flush = true);
+
+protected:
+	ServiceInterfaceBuffer streambuf;
 };
 
-
+// Forward declaration of interface streams. These should be instantiated in
+// main. They can then be used like std::cout or std::cerr.
+namespace sif {
+extern ServiceInterfaceStream debug;
+extern ServiceInterfaceStream info;
+extern ServiceInterfaceStream warning;
+extern ServiceInterfaceStream error;
+}
 
 #endif /* FRAMEWORK_SERVICEINTERFACE_SERVICEINTERFACESTREAM_H_ */