[your code here]

[Roumen Roupski]

// Checks if two files have equal content using memory mapped 
files
import std.file;
import std.mmfile;
import std.stdio;

// Compares the content of two files
private bool equals(in string f1, in string f2)
{
	if (getSize(f1) != getSize(f2))
		return false;	// different file sizes

	if (getSize(f1) == 0)
		return true;	// zero-length files are equal
	
	MmFile m1, m2;
	try
	{
		m1 = new MmFile(f1);
		m2 = new MmFile(f2);
		return m1[] == m2[];
	}
	catch (Throwable ex)
	{
		writefln("File read error: %s", ex.msg);
		return false;  // cannot compare the files
	}
	finally
	{
		delete m1;
		delete m2;
	}
}

void main (string[] args)
{
	enum NotFound = "Cannot open file: %s";

	if (args.length == 3)
	{
		auto f1 = args[1], f2 = args[2];

		if (!(exists(f1) && isFile(f1)))
			writefln(NotFound, f1);
		else if (!(exists(f2) && isFile(f2)))
			writefln(NotFound, f2);
		else if (equals(f1, f2))
			writeln("Same files");
		else
			writeln("Different files");
	}
	else
	{
		writeln("Usage: filequals <file1> <file2>");
	}
}