From: Victor Porton <porton@narod.ru>
Subject: Re: Troubles with C strings
Date: Sat, 26 Jul 2014 18:52:45 +0300
Date: 2014-07-26T18:52:45+03:00 [thread overview]
Message-ID: <lr0isa$i0j$1@speranza.aioe.org> (raw)
In-Reply-To: DCPAv.94175$46.4928@fx19.iad
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
next prev parent reply other threads:[~2014-07-26 15:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-26 14:13 Troubles with C strings Victor Porton
2014-07-26 15:15 ` Shark8
2014-07-26 15:52 ` Victor Porton [this message]
2014-07-26 17:09 ` Shark8
2014-07-26 19:06 ` Peter Chapin
2014-07-26 19:09 ` Victor Porton
2014-08-01 22:16 ` Victor Porton
2014-07-26 18:41 ` Niklas Holsti
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