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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: for S'Image use Func??
Date: Tue, 11 May 2010 17:54:27 +0200
Organization: Ada At Home
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Date: 2010-05-11T17:54:27+02:00
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Le Tue, 11 May 2010 09:58:16 +0200, Maciej Sobczak  =

<see.my.homepage@gmail.com> a =C3=A9crit:

> On 11 Maj, 00:24, Yannick Duch=C3=AAne (Hibou57) <yannick_duch...@yaho=
o.fr>
> wrote:
>
>> Only as long as you only rely on fopen ;
>
> This function is defined in the C standard.
>
>> there is also an "int open(char * filename, int flags)" which is wide=
ly  =

>> used.
>
> This one is not defined in the C standard and as such is not part of
> the C language.
So C writers do not enforce standards. This "open" is even more widely  =

used than "fopen", I use to see it every-where.

Note : I knew open is not part of ISO/ANSI C, I was teasing you about a =
 =

trouble with C sources.

>> Weither or not this "int" actually stands for a pointer is another  =

>> story (as in C one will always be able to cast from int to void*, thi=
s  =

>> may be true indeed).
>
> No this is not true either - assuming that you mean the "open"
> function defined in the POSIX standard, the return value is the lowest=

> *numbered* unused file descriptor. This is aligned with the semantics
> of other functions like select.
>
> Another reason for why this cannot be a pointer is that NULL is
> defined to be a pointer value that does *not* point to any object; at
> the same time STDIN_FILENO, denoting a file descriptor for standard
> input, has a value 0, which is equivalent to NULL.
True, clever notice

> Interestingly, Unix file descriptors are *much safer* than standard
> C's FILE pointers in that they are free from undefined behavior. Of
> course, it would be even better to have a distinct type for them.
>
> (OK, that's enough for off-topic confusions, I duck away to reinvent
> My_Better.Text_IO on top of Ada.Streams ;-) )
Please, what does mean =E2=80=9Cto duck away=E2=80=9D ?


-- =

pragma Asset ? Is that true ? Waaww... great