Date: Fri, 26 Dec 2008 20:32:45 -0500 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: Gary Kline <kline@thought.org> Cc: FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG> Subject: Re: how can i be certain that a file has copied exactly? Message-ID: <44bpuyh076.fsf@lowell-desk.lan> In-Reply-To: <20081227011335.GA29354@thought.org> (Gary Kline's message of "Fri\, 26 Dec 2008 17\:13\:39 -0800") References: <20081227011335.GA29354@thought.org>
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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? -- Lowell Gilbert, embedded/networking software engineer, Boston area http://be-well.ilk.org/~lowell/
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