Refactored logging functionality into Log class.

xpcPlugin/Log.cpp

@@ -0,0 +1,71 @@
+//Copyright (c) 2013-2015 United States Government as represented by the Administrator of the
+//National Aeronautics and Space Administration. All Rights Reserved.
+#include "Log.h"
+#include <cstdarg>
+#include <stdio.h>
+#include <time.h>
+
+// Implementation note: I initial wrote this class using C++ iostreams, but I couldn't find any
+// way to implement FormatLine without adding in a call to sprintf. It therefore seems more
+// efficient to me to just use C-style IO and call fprintf directly.
+namespace XPC
+{
+	static void WriteTime(FILE* fd)
+	{
+		time_t rawtime;
+		struct tm* timeinfo;
+		time(&rawtime);
+		timeinfo = localtime(&rawtime);
+
+		char buffer[23] = { 0 };
+		// Format is equivalent to [%F %T], but neither of those specifiers is
+		// supported on Windows as of Visual Studio 13
+		strftime(buffer, 23, "[%Y-%m-%d %H:%M:%S] ", timeinfo);
+		
+		fprintf(fd, buffer);
+	}
+
+	void Log::Initialize()
+	{
+
+	}
+
+	void Log::WriteLine(const std::string& value)
+	{
+		Log::WriteLine(value.c_str());
+	}
+
+	void Log::WriteLine(const char* value)
+	{
+		FILE* fd = fopen("xpcLog.txt", "a");
+		if (!fd)
+		{
+			return;
+		}
+
+		WriteTime(fd);
+		fprintf(fd, "%s\n", value);
+
+		fclose(fd);
+	}
+
+	void Log::FormatLine(const char* format, ...)
+	{
+		va_list args;
+		va_start(args, format);
+
+		FILE* fd = fopen("xpcLog.txt", "a");
+		if (!fd)
+		{
+			return;
+		}
+
+		WriteTime(fd);
+		vfprintf(fd, format, args);
+		fprintf(fd, "\n");
+
+		fclose(fd);
+
+		va_end(args);
+	}
+}