From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: Victor Porton Newsgroups: comp.lang.ada Subject: Re: Troubles with C strings Date: Sat, 26 Jul 2014 18:52:45 +0300 Organization: Aioe.org NNTP Server Message-ID: References: NNTP-Posting-Host: rFX7cZOSaeuGGZI2vwQTaQ.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Complaints-To: abuse@aioe.org User-Agent: KNode/4.12.4 X-Notice: Filtered by postfilter v. 0.8.2 Xref: news.eternal-september.org comp.lang.ada:21249 Date: 2014-07-26T18:52:45+03:00 List-Id: Shark8 wrote: > On 26-Jul-14 08:13, Victor Porton wrote: >> Also: It seems that in Interfaces.C.Strings there is no function which >> creates an Ada string of specified length from a chars_ptr (without >> checking for NUL). Addition of such a function would be good, because it >> can be very fast (on some platforms it can be implemented as memcpy). > > Such a function cannot exist: to determine the length of a C-style > string you *must* scan through it for the terminating NULL. What you > describe would be a "substring" method that can read beyond the > string-bounds without raising an error... and I see no way that would > end well. It can. The length of the string may be "scanned" earlier and be stored, so that we could later use it efficiently. -- Victor Porton - http://portonvictor.org