how can i be certain that a file has copied exactly?
kline at thought.org
Sat Dec 27 02:10:28 UTC 2008
On Fri, Dec 26, 2008 at 08:32:45PM -0500, Lowell Gilbert wrote:
> Gary Kline <kline at thought.org> writes:
> > is there a way i can be sure that my little C program has copied a
> > dos/win file named, say, foo.htm\;7 to simply foo.htm?
> > my program uses fopen/fgets/fputs to copy the markup files. of
> > the several i have copied, no problem. unless i hack cmp or diff,
> > i have to avoid the shell.
> > any ideas? in other words, does anybody have a prefab cmp(oldfile, newfile)
> > fn?
> mtree(1) handles whole ranges of files.
> For a single file, you could use some kind of checksum in your program
> or externally, but in general it will be comparing against the cache of
> the file's buffers, not against what is really on disk, so if you
> suspect an operating system or hardware-write bug, you won't spot it
> What, precisely, would you like to protect against?
again bad copies! mtree might work, but given the number of
files, i'd be better off hacking usr.bin/cmp !!
enjoy, spring is only 90 da off:-)
> Lowell Gilbert, embedded/networking software engineer, Boston area
Gary Kline kline at thought.org http://www.thought.org Public Service Unix
The 2.17a release of Jottings: http://jottings.thought.org/index.php
More information about the freebsd-questions