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Xref: sserve comp.unix.bsd:15499 comp.lang.c:87577 comp.unix.sys5.r3:2311 Newsgroups: comp.unix.bsd,comp.lang.c,comp.unix.sys5.r3 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msunews!caen!newsxfer.itd.umich.edu!gatech!swrinde!pipex!uunet!maple.enet.net!asuvax!chnews!ornews.intel.com!news.jf.intel.com!psinntp!psinntp!garfield!dev17!egriebel From: egriebel@dev17 (Ed Griebel) Subject: Re: how to completely get rid of bcopy, bzero, bcmp? Message-ID: <1994Dec7.211430.3596@bfm.com> Followup-To: comp.unix.bsd,comp.lang.c,comp.unix.sys5.r3 Sender: news@bfm.com Organization: BFM X-Newsreader: TIN [version 1.2 PL2] References: <3bksus$fg4@spruce.cic.net> <MICHAELV.94Dec2213754@MindBender.HeadCandy.com> Date: Wed, 7 Dec 1994 21:14:30 GMT Lines: 38 Michael L. VanLoon (michaelv@MindBender.HeadCandy.com) wrote on 03 Dec 1994 03:37:54 GMT: : In article <3bksus$fg4@spruce.cic.net> pauls@locust.cic.net (Paul Southworth) writes: : See memcpy, memset, memcmp. The problem with memcpy is that it doesn't check for overlapping regions. where, as I understand it (coming from a SunOS/BSD 4.3 world), bcopy will handle overlaps correctly. From the memcpy(2) manpage: memcpy(void *s1, const void *s2, size_t n); [...] If the source and destination areas overlap such that s2 < s1<s2 + n, the behavior is undefined. [...] ..if the source and destination areas overlap...use _rmemcpy [I think a machine-specific call?] Also, the source and destination args to b*() are the reverse of mem*(). -ed [sorry for multiple followup groups...] : -- : - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - : Michael L. VanLoon michaelv@HeadCandy.com michaelv@iastate.edu : Free your mind and your machine -- NetBSD free un*x for PC/Mac/Amiga/etc. : Working NetBSD ports: 386+PC, Mac, Amiga, HP300, Sun3, Sun4c, PC532 : In progress: DEC pmax (MIPS R2k/3k), VAX, Sun4m : - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- --- "You can't let go and you can't hold on, You can't go back and you can't stand still" +---------------------------------+--------------------------------------+ ! Edward Griebel ! Trading Systems Group ! ! e-mail: ed_griebel@bfm.com ! BlackRock Financial Management ! +---------------------------------+--------------------------------------+