Attempted answer to exercise 16-3-dirname

[mdeh]

Code: (Objective-C)

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

/* dirname - return the directory portion of a pathname */
/* fails if pathname are all "////" and probably some other circumstances too!!  */

int main (int argc, const char * argv[]) {
    NSAutoreleasePool				* pool = [[NSAutoreleasePool alloc] init];
	NSFileManager					*fm = [ NSFileManager defaultManager];
	NSProcessInfo					*proc = [NSProcessInfo processInfo];
	NSArray							*args = [proc arguments];
/*	NSMutableArray					* pComponents;   */
	NSString						*command_line_path, *dirPath ;
	BOOL							isDirect, exists;
	int								pathCount;
	
	/* check usage */
	
	if ( args.count != 2)
	{
		NSLog(@"Usage:%@ pathname NAME", [proc processName]);
		return 1;
	}
	
	
	
	command_line_path = [args objectAtIndex: 1];
	
	pathCount = [[ command_line_path pathComponents]count];
	
	/* is path a directory */
	
	exists = [fm fileExistsAtPath: command_line_path isDirectory: &isDirect];
		if (!isDirect && pathCount > 1)
			dirPath = [command_line_path stringByDeletingLastPathComponent];
		else if (!isDirect && pathCount == 1)
			dirPath = @".";
		else
			dirPath = command_line_path;
	NSLog(@"%@", dirPath);
    [pool drain];
    return 0;
}