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Groups > comp.lang.c > #75797

Re: memset extensions

From James Kuyper <jameskuyper@verizon.net>
Newsgroups comp.lang.c
Subject Re: memset extensions
Date 2015-11-11 17:29 -0500
Organization Self
Message-ID <5643C14B.6050808@verizon.net> (permalink)
References (6 earlier) <n20aav$3rt$1@dont-email.me> <lnsi4cqlmo.fsf@kst-u.example.com> <n20cpr$efc$1@dont-email.me> <5643B856.70101@verizon.net> <n20dob$ilb$1@dont-email.me>

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On 11/11/2015 05:01 PM, jacobnavia wrote:
> Le 11/11/2015 22:51, James Kuyper a écrit :
>> On 11/11/2015 04:45 PM, jacobnavia wrote:
>>> Le 11/11/2015 22:19, Keith Thompson a écrit :
>>>> That's only a problem if the argument is a character constant -- and if
>>>> it is, then you're probably going to use memset() anyway.
>>>
>>> What about shorts?
>>>
>>> 25987
>>>
>>> Is that a short or an int?
>>>
>>> How can I (without explicit cast) make it a short?
>>
>>     short limit = 25987;
>>
> 
> I was speaking of course in the context of a _Generic expression

_Generic(limit, ...) works fine.

> The problem is that there is no suffix to add to an integer constant in 
> C to force it to a short int.

The possibility that you'll want to use integer constants as the second
argument is what makes it more reasonable to apply _Generic() to the
first argument than the second. It's dangerous to pass anything other
than a uint32_t* value as the first argument of _memset32(), so
requiring a cast to uint32_t* in those cases serves the useful purpose
of marking the code as dangerous.

Note: I'm not saying that you have to use _Generic(); merely defending
Philipp Klause Krause's suggest that you use it. I recommend replacing
the void* arguments with type-safe arguments, whether or not you choose
to use _Generic().

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memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 11:05 +0100
  Re: memset extensions Lőrinczy Zsigmond <zsiga@nospam.for.me> - 2015-11-11 11:08 +0100
    Re: memset extensions "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-11 04:56 -0800
  Re: memset extensions Philipp Klaus Krause <pkk@spth.de> - 2015-11-11 13:39 +0100
    Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 17:34 +0100
      Re: memset extensions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-11 17:22 +0000
        Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 21:19 +0100
          Re: memset extensions Keith Thompson <kst-u@mib.org> - 2015-11-11 12:51 -0800
          Re: memset extensions James Kuyper <jameskuyper@verizon.net> - 2015-11-11 16:01 -0500
            Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 22:03 +0100
              Re: memset extensions Keith Thompson <kst-u@mib.org> - 2015-11-11 13:19 -0800
                Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 22:45 +0100
                Re: memset extensions James Kuyper <jameskuyper@verizon.net> - 2015-11-11 16:51 -0500
                Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 23:01 +0100
                Re: memset extensions James Kuyper <jameskuyper@verizon.net> - 2015-11-11 17:29 -0500
                Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 23:36 +0100
                Re: memset extensions Keith Thompson <kst-u@mib.org> - 2015-11-11 15:00 -0800
              Re: memset extensions James Kuyper <jameskuyper@verizon.net> - 2015-11-11 16:48 -0500
          Re: memset extensions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-11 22:15 +0000
  Re: memset extensions James Kuyper <jameskuyper@verizon.net> - 2015-11-11 08:05 -0500
  Re: memset extensions Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-11 08:31 -0500
    Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 17:34 +0100
  Re: memset extensions Les Cargill <lcargill99@comcast.com> - 2015-11-11 08:30 -0600
    Re: memset extensions Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-11 09:48 -0500
    Re: memset extensions gwowen <gwowen@gmail.com> - 2015-11-11 07:55 -0800
    Re: memset extensions James Kuyper <jameskuyper@verizon.net> - 2015-11-11 11:24 -0500
    Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 17:32 +0100
      Re: memset extensions Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-11 11:44 -0500
      Re: memset extensions raltbos@xs4all.nl (Richard Bos) - 2015-11-17 22:53 +0000
        Re: memset extensions supercat@casperkitty.com - 2015-11-17 15:37 -0800
          Re: memset extensions raltbos@xs4all.nl (Richard Bos) - 2015-11-20 11:27 +0000
            Re: memset extensions supercat@casperkitty.com - 2015-11-20 08:45 -0800
  Re: memset extensions supercat@casperkitty.com - 2015-11-11 08:25 -0800
  Re: memset extensions Keith Thompson <kst-u@mib.org> - 2015-11-11 09:09 -0800
    Re: memset extensions supercat@casperkitty.com - 2015-11-11 09:18 -0800
      Re: memset extensions Keith Thompson <kst-u@mib.org> - 2015-11-11 10:57 -0800
    Re: memset extensions jacobnavia <jacob@jacob.remcomp.fr> - 2015-11-11 21:17 +0100

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