Date: Fri, 26 Dec 2008 18:10:23 -0800 From: Gary Kline <kline@thought.org> To: FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG> Subject: Re: how can i be certain that a file has copied exactly? Message-ID: <20081227021022.GD29639@thought.org> In-Reply-To: <44bpuyh076.fsf@lowell-desk.lan> References: <20081227011335.GA29354@thought.org> <44bpuyh076.fsf@lowell-desk.lan>
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On Fri, Dec 26, 2008 at 08:32:45PM -0500, Lowell Gilbert wrote: > Gary Kline <kline@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 > immediately. > > 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 !! oh-well, enjoy, spring is only 90 da off:-) > -- > Lowell Gilbert, embedded/networking software engineer, Boston area > http://be-well.ilk.org/~lowell/ -- Gary Kline kline@thought.org http://www.thought.org Public Service Unix http://jottings.thought.org http://transfinite.thought.org The 2.17a release of Jottings: http://jottings.thought.org/index.php
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