SimGrid cpp platform to expanded xml

sgflatdump.cpp

#include <simgrid/instr.h>
#include <simgrid/s4u.hpp>
#include <simgrid/s4u/Host.hpp>

// #include "simgrid/s4u.hpp"

#include <xbt/log.h>
#include <rapidjson/document.h>
#include <rapidjson/writer.h>
#include <string>
#include <sstream>

int main(int argc, char **argv)
{
	simgrid::s4u::Engine e(&argc, argv);
	xbt_assert(argc == 3, "Usage: %s <platform_file> <flatify.xml>", argv[0]);

	e.load_platform(argv[1]);
	e.seal_platform();

	const std::string outputfile(argv[2]);
	const std::string extension = outputfile.substr(outputfile.find_last_of(".") + 1);
	if (extension == "xml")
	{
		printf("Dumping to %s\n", outputfile.c_str());
		std::string xmls = e.flatify_platform();
		FILE *file = fopen(outputfile.c_str(), "w");
		if (file == nullptr)
		{
			xbt_die("Cannot open file %s", outputfile.c_str());
		}
		fprintf(file, "%s", xmls.c_str());
		fclose(file);
	}

	else

		xbt_die("Unknown output file format, please use '.csv' or .json' extension");

return 0;
}