Cusom file copy prog

[Fatinez]

Hi,

I have an assignment where i have to write a custom file copy program for UNIX. We are not allowed to use system() and cannon use the UNIX cp command in any way.

command line looks like this:
mycp orig dest

orig is copied to dest.
If dest does not exist, it is created. If it does exist, it is overwritten. If dest is a directory, orig is copied into that directory with the same file name, ie. c:\orig -> c:\dest\orig

Now the problem:
this code is simplified a lot

FILE *src, *dst;
char data[BUFFSIZE];

src = fopen(argv[1],"rb");
dst = fopen(argv[2], "wb");

while(fgets(data,sizeof(data),src) != NULL)
    	fputs(data,dst);

If dest exists, the file copies fine. But if dest doesn't exist, the file pointer is 0 and I get a segmentation fault when it tries to write to it.

Also, how do I check if dest is a directory?

Any help would be appreciated. Thanks

[poccil]

Here's a helpful link:
http://cboard.cprogramming.com/showt...ight=directory

[Fatinez]

Thanks a lot, poccil. I figured out the other problem and got the directory thing working. It now works to perfection.