From owner-freebsd-questions@FreeBSD.ORG Sat Dec 27 02:10:27 2008 Return-Path: Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E57CB1065670 for ; Sat, 27 Dec 2008 02:10:27 +0000 (UTC) (envelope-from kline@thought.org) Received: from aristotle.thought.org (aristotle.thought.org [209.180.213.210]) by mx1.freebsd.org (Postfix) with ESMTP id A53588FC1A for ; Sat, 27 Dec 2008 02:10:27 +0000 (UTC) (envelope-from kline@thought.org) Received: from thought.org (tao.thought.org [10.47.0.250]) (authenticated bits=0) by aristotle.thought.org (8.14.2/8.14.2) with ESMTP id mBR2AvZ0064263 for ; Fri, 26 Dec 2008 18:10:57 -0800 (PST) (envelope-from kline@thought.org) Received: by thought.org (nbSMTP-1.00) for uid 1002 kline@thought.org; Fri, 26 Dec 2008 18:10:23 -0800 (PST) Date: Fri, 26 Dec 2008 18:10:23 -0800 From: Gary Kline To: FreeBSD Mailing List Message-ID: <20081227021022.GD29639@thought.org> References: <20081227011335.GA29354@thought.org> <44bpuyh076.fsf@lowell-desk.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <44bpuyh076.fsf@lowell-desk.lan> User-Agent: Mutt/1.4.2.3i X-Organization: Thought Unlimited. Public service Unix since 1986. X-Of_Interest: With 22 years of service to the Unix community. X-Spam-Status: No, score=-4.4 required=3.6 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.2.3 X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on aristotle.thought.org Cc: Subject: Re: how can i be certain that a file has copied exactly? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Dec 2008 02:10:28 -0000 On Fri, Dec 26, 2008 at 08:32:45PM -0500, Lowell Gilbert wrote: > Gary Kline 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