Program 16.6

[bitshifter]

Code: (Objective-C)

// Implement a basic copy utility

#import <Foundation/NSString.h>
#import <Foundation/NSArray.h>
#import <Foundation/NSFileManager.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSPathUtilities.h>
#import <Foundation/NSProcessInfo.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
	NSFileManager *fm;
	NSString *source, *dest;
	BOOL isDir;
	NSProcessInfo *proc = [NSProcessInfo processInfo];
	NSArray *args = [proc arguments];
	
	fm = [NSFileManager defaultManager];
	
	// Check for two arguments on the command line
	
	if ([args count] != 3)
	{
		NSLog(@"Usage: %@ src dest", [proc processName]);
		return 1;
	}
	
	source = [args objectAtIndex: 1];
	dest = [args objectAtIndex: 2];
	
	// Make sure the source file can be read
	
	if ([fm isReadableFileAtPath:source] == NO)
	{
		NSLog(@"Can't read %@", source);
		return 2;
	}
	
	// See if the destination file is a directory
	// if it is, add the source to the end of the destination
	
	[fm fileExistsAtPath:dest isDirectory:&isDir];
	
	if (isDir == YES)
		dest = [dest stringByAppendingPathComponent:[source lastPathComponent]];
	
	// Remove the destination file if it already exists
	
	[fm removeItemAtPath: dest error: NULL];
	
	// Okay, time to perform the copy
	
	if ([fm copyItemAtPath:source toPath: dest error: NULL] == NO)
	{
		NSLog(@"Copy failed!");
		return 3;
	}
	
	NSLog(@"Copy of %@ to %@ succeeded!", source, dest);
	
    [pool drain];
    return 0;
}