Linux: Use config file for gateway settings (#1061)

- The following settings can be use on the config file:
  - verbose=[debug,info,notice,warn,err] - Logging verbosity.
  - log_file[0|1] - Enable logging to a file.
  - log_filepath=(FILE) - Log file path.
  - log_pipe=[0|1] - Enable logging to a named pipe(aka fifo).
    Use this option to view your gateway's log messages from the
    log_pipe_file (defined below).
    To do so, run the following command on another terminal:
    - $ cat "log_pipe_file"
  - log_pipe_file=(FILE)
  - syslog=[0|1] - Enable logging to syslog.
  - eeprom_file=[/etc/mysensors.eeprom]
  - eeprom_size=[1024]
- Change some mysgw parameters:
  - Added:
    - -q, --quiet:  for quiet mode, disable log messages written to the
    terminal.
  - Removed:
    - -d, --debug: removed, log messages are now enabled by default.
  - Replaced:
    - -b, --background: replaced by --daemon
- isatty() is no longer used, log messages by default are printed to
  stderr unless the gateway is started with --quiet (#1022)
- MY_LINUX_CONFIG_FILE: no longer holds the path to the eeprom file,
  but to the configuration file

drivers/Linux/SoftEeprom.cpp

@@ -6,7 +6,7 @@
  * network topology allowing messages to be routed to nodes.
  *
  * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
- * Copyright (C) 2013-2017 Sensnology AB
+ * Copyright (C) 2013-2018 Sensnology AB
  * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
  *
  * Documentation: http://www.mysensors.org
@@ -26,46 +26,8 @@
 #include "log.h"
 #include "SoftEeprom.h"
 
-SoftEeprom::SoftEeprom(const char *fileName, size_t length)
+SoftEeprom::SoftEeprom() : _length(0), _fileName(NULL), _values(NULL)
 {
-	struct stat fileInfo;
-
-	_fileName = strdup(fileName);
-	if (_fileName == NULL) {
-		logError("Error: %s\n", strerror(errno));
-		exit(1);
-	}
-
-	_length = length;
-	_values = new uint8_t[_length];
-	for (size_t i = 0; i < _length; ++i) {
-		_values[i] = 0xFF;
-	}
-
-	if (stat(_fileName, &fileInfo) != 0) {
-		//File does not exist.  Create it.
-		logInfo("Config file %s does not exist, creating new config file.\n", _fileName);
-		std::ofstream myFile(_fileName, std::ios::out | std::ios::binary);
-		if (!myFile) {
-			logError("Unable to create config file %s.\n", _fileName);
-			exit(1);
-		}
-		myFile.write((const char*)_values, _length);
-		myFile.close();
-	} else if (fileInfo.st_size < 0 || (size_t)fileInfo.st_size != _length) {
-		logError("Config file %s is not the correct size of %zu.  Please remove the file and a new one will be created.\n",
-		         _fileName, _length);
-		exit(1);
-	} else {
-		//Read config into local memory.
-		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
-		if (!myFile) {
-			logError("Unable to open config to file %s for reading.\n", _fileName);
-			exit(1);
-		}
-		myFile.read((char*)_values, _length);
-		myFile.close();
-	}
 }
 
 SoftEeprom::SoftEeprom(const SoftEeprom& other)
@@ -81,8 +43,63 @@ SoftEeprom::SoftEeprom(const SoftEeprom& other)
 
 SoftEeprom::~SoftEeprom()
 {
-	delete[] _values;
-	free(_fileName);
+	destroy();
+}
+
+int SoftEeprom::init(const char *fileName, size_t length)
+{
+	struct stat fileInfo;
+
+	destroy();
+
+	_fileName = strdup(fileName);
+	if (_fileName == NULL) {
+		logError("Error: %s\n", strerror(errno));
+		return -1;
+	}
+
+	_length = length;
+	_values = new uint8_t[_length];
+	for (size_t i = 0; i < _length; ++i) {
+		_values[i] = 0xFF;
+	}
+
+	if (stat(_fileName, &fileInfo) != 0) {
+		//File does not exist.  Create it.
+		logInfo("EEPROM file %s does not exist, creating new file.\n", _fileName);
+		std::ofstream myFile(_fileName, std::ios::out | std::ios::binary);
+		if (!myFile) {
+			logError("Unable to create config file %s.\n", _fileName);
+			return -1;
+		}
+		myFile.write((const char*)_values, _length);
+		myFile.close();
+	} else if (fileInfo.st_size < 0 || (size_t)fileInfo.st_size != _length) {
+		logError("EEPROM file %s is not the correct size of %zu.  Please remove the file and a new one will be created.\n",
+		         _fileName, _length);
+		return -1;
+	} else {
+		//Read config into local memory.
+		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
+		if (!myFile) {
+			logError("Unable to open EEPROM file %s for reading.\n", _fileName);
+			return -1;
+		}
+		myFile.read((char*)_values, _length);
+		myFile.close();
+	}
+
+	return 0;
+}
+
+void SoftEeprom::destroy()
+{
+	if (_values) {
+		delete[] _values;
+	}
+	if (_fileName) {
+		free(_fileName);
+	}
 }
 
 void SoftEeprom::readBlock(void* buf, void* addr, size_t length)
@@ -90,7 +107,7 @@ void SoftEeprom::readBlock(void* buf, void* addr, size_t length)
 	static bool config_to_mem = false;
 	unsigned long int offs = reinterpret_cast<unsigned long int>(addr);
 
-	if (!config_to_mem) {
+	if (!config_to_mem && length) {
 		//Read config into local memory.
 		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
 		if (!myFile) {
@@ -144,6 +161,9 @@ void SoftEeprom::writeByte(int addr, uint8_t value)
 SoftEeprom& SoftEeprom::operator=(const SoftEeprom& other)
 {
 	if (this != &other) {
+		delete[] _values;
+		free(_fileName);
+
 		_fileName = strdup(other._fileName);
 
 		_length = other._length;