From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: David Kastrup Newsgroups: gmane.emacs.devel Subject: Re: Compiling Elisp to a native code with a GCC plugin Date: Fri, 17 Sep 2010 15:55:17 +0200 Organization: Organization?!? Message-ID: <87fwx8bhkq.fsf@lola.goethe.zz> References: <87bp805ecr.fsf@gmail.com> <87iq26z97e.fsf@uwakimon.sk.tsukuba.ac.jp> <87y6b0yi8o.fsf@uwakimon.sk.tsukuba.ac.jp> <87sk18bioh.fsf@lola.goethe.zz> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1284732372 17090 80.91.229.12 (17 Sep 2010 14:06:12 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 17 Sep 2010 14:06:12 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Sep 17 16:06:10 2010 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1OwbZp-0001KO-Kd for ged-emacs-devel@m.gmane.org; Fri, 17 Sep 2010 16:06:09 +0200 Original-Received: from localhost ([127.0.0.1]:35050 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OwbZo-00044Z-M8 for ged-emacs-devel@m.gmane.org; Fri, 17 Sep 2010 10:06:08 -0400 Original-Received: from [140.186.70.92] (port=45386 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OwbZY-000407-Bi for emacs-devel@gnu.org; Fri, 17 Sep 2010 10:05:58 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OwbPa-0003mi-5B for emacs-devel@gnu.org; Fri, 17 Sep 2010 09:55:35 -0400 Original-Received: from lo.gmane.org ([80.91.229.12]:45161) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OwbPZ-0003mb-Oi for emacs-devel@gnu.org; Fri, 17 Sep 2010 09:55:34 -0400 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1OwbPV-0003W1-Tf for emacs-devel@gnu.org; Fri, 17 Sep 2010 15:55:29 +0200 Original-Received: from p508ea523.dip.t-dialin.net ([80.142.165.35]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 17 Sep 2010 15:55:29 +0200 Original-Received: from dak by p508ea523.dip.t-dialin.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 17 Sep 2010 15:55:29 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 28 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: p508ea523.dip.t-dialin.net X-Face: 2FEFf>]>q>2iw=B6, xrUubRI>pR&Ml9=ao@P@i)L:\urd*t9M~y1^:+Y]'C0~{mAl`oQuAl \!3KEIp?*w`|bL5qr,H)LFO6Q=qx~iH4DN; i"; /yuIsqbLLCh/!U#X[S~(5eZ41to5f%E@'ELIi$t^ Vc\LWP@J5p^rst0+('>Er0=^1{]M9!p?&:\z]|;&=NP3AhB!B_bi^]Pfkw User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) Cancel-Lock: sha1:5Je2zpR8FdfEaX5++4jwGsjIj4k= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:130305 Archived-At: Lars Magne Ingebrigtsen writes: > David Kastrup writes: > >> + end_byte = CHAR_TO_BYTE (end); >> + >> + if (! memcmp (SDATA (string), BYTE_POS_ADDR (start_byte), >> + end_byte - start_byte)) >> >> That is assuming that both string and buffer are identically encoded >> (nowadays that likely means both have the same multibyteness). > > Which brings me back to the other question I had, about buffer > internals. :-) > > It was a guess based on Fbuffer_substring doing this: > > memcpy (SDATA (result), BYTE_POS_ADDR (start_byte), end_byte - start_byte); > > So I thought that if you could create a string by just memcpy()-ing data > from the buffer, then it seemed likely that you could compare them with > memcmp(). But that's probably wrong? Fbuffer_substring also likely copies the multibyteness, not just the bytes. -- David Kastrup