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David Brown <david.brown@hesbynett.no> writes:
> On 24/03/17 19:04, James Kuyper wrote:
>> On 03/24/2017 01:48 PM, David Brown wrote:
>> ...
>>> While malloc only cares about the size of the allocation, I think the
>>> type /is/ important here. If you have "widget *p; p = malloc(sizeof
>>> gadget);", then the code almost certainly has a big bug even if "gadget"
>>> and "widget" are the same size. The allocation will be fine, but you've
>>> got a logical bug somewhere.
>>
>> Yes, but "sizeof *p" avoids that problem perfectly, without making any
>> mention of the type.
>
> No, it makes this bug even harder to find.
>
> If the user writes "p = malloc(sizeof gadget)" when p is declared as
> "widget *", then you can see that they are mixing up gadgets and
> widgets. If the user, with the same logical mixup, writes "p =
> malloc(*p)", then it is harder to spot the logical flaw.
I don't understand. Did you mean to omit the "sizeof" keyword in your
example?
If you write
p = malloc(*p);
then that's almost certainly a bug, and one that the compiler probably
won't catch if *p has a numeric type. But if you write
p = malloc(sizeof *p);
then you *can't* mix up gadgets and widgets. If p is a pointer to
gadget, it allocates space for one gadget; if p is a pointer to widget,
it allocates space for one widget.
> The point is, there is a bug somewhere. If you are lucky, the compiler
> can help find it. Less lucky, you can see it from the code.
>
> I am not saying that writing "malloc(sizeof gadget)" is necessarily a
> good idea overall - but it may have some merits.
If gadget is a type, this has to be `malloc(sizeof (gadget))`.
I presume that you're making a valid point, but I'm unable to determine
what it is. Can you clarify?
[...]
There is one valid point I can think of here. It's reasonable to argue
that this:
p = (gadget*)malloc(sizeof (gadget));
is safer than:
p = malloc(sizeof (gadget));
If p is of type gadget*, both are correct. If p is of type widget*,
then both are incorrect, but only the first will be caught by the
compiler. So *if* you use `sizeof (type_name)` rather than `sizeof
*pointer_object`, and *if* you manage to keep the two references to the
type name consistent, then a cast can help the compiler detect errors
that it would not detect without the cast.
But I still maintain that
p = malloc(sizeof *p);
is better than either. It doesn't includes a reminder that p points to
a widget, but no such reminder is needed at that point. If you need to
remember what p points to, look at its declaration, or at the code that
uses it.
Similarly, I can write
n ++;
without having to specify which numeric type n has. I could remind
myself that it's, say, an unsigned int by writing:
n = (unsigned int)(n + 1);
but that's hardly an improvement. There's a simple way to write it that
doesn't require specifying the type. (This case is admittedly different
because, unlike pointers, numeric types can be implicitly converted, so
the above probably won't be diagnosed even if n is a signed char.)
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 09:56 -0700
Re: My C program does not compile or gives segmentation fault GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-23 18:04 +0100
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-23 17:07 +0000
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 10:36 -0700
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 10:42 -0700
Re: My C program does not compile or gives segmentation fault GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-23 18:52 +0100
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 12:54 -0600
Re: My C program does not compile or gives segmentation fault GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-24 00:02 +0100
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 17:16 -0600
Re: My C program does not compile or gives segmentation fault GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-24 00:32 +0100
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 11:57 -0600
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 11:23 -0700
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 12:53 -0600
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-23 19:00 +0000
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Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-23 20:43 -0400
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Re: My C program does not compile or gives segmentation fault Ian Collins <ian-news@hotmail.com> - 2017-03-24 14:33 +1300
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Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-27 08:15 +0100
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Re: My C program does not compile or gives segmentation fault Ian Collins <ian-news@hotmail.com> - 2017-03-25 08:41 +1300
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-24 16:27 -0600
Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-03-24 21:36 -0400
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 20:44 -0400
Re: My C program does not compile or gives segmentation fault Ian Collins <ian-news@hotmail.com> - 2017-03-25 14:46 +1300
Re: My C program does not compile or gives segmentation fault supercat@casperkitty.com - 2017-03-24 11:24 -0700
Re: My C program does not compile or gives segmentation fault scott@slp53.sl.home (Scott Lurndal) - 2017-03-24 13:52 +0000
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 13:55 +0000
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 10:31 -0400
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 14:39 +0000
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 12:54 -0400
Re: My C program does not compile or gives segmentation fault Jorgen Grahn <grahn+nntp@snipabacken.se> - 2017-03-23 21:56 +0000
Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-23 15:18 -0700
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 16:39 -0600
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-23 20:42 -0400
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 16:33 -0600
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-23 20:45 -0400
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 10:01 +0000
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 09:27 -0400
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 13:53 +0000
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 10:32 -0400
Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 14:42 +0000
Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 12:56 -0400
Re: My C program does not compile or gives segmentation fault supercat@casperkitty.com - 2017-03-24 08:45 -0700
Re: My C program does not compile or gives segmentation fault Jorgen Grahn <grahn+nntp@snipabacken.se> - 2017-03-23 21:14 +0000
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 11:52 -0600
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 11:03 -0700
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 11:14 -0700
Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 12:41 -0600
Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-23 11:48 -0700
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 11:59 -0700
Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-23 12:35 -0700
Re: My C program does not compile or gives segmentation fault acidlategamer@gmail.com - 2017-03-23 12:48 -0700
Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-23 13:24 -0700
Re: My C program does not compile or gives segmentation fault scott@slp53.sl.home (Scott Lurndal) - 2017-03-23 20:46 +0000
Re: My C program does not compile or gives segmentation fault Barry Schwarz <schwarzb@dqel.com> - 2017-03-23 19:02 -0700
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