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Groups > comp.lang.c > #106967

Re: My C program does not compile or gives segmentation fault

From David Brown <david.brown@hesbynett.no>
Newsgroups comp.lang.c
Subject Re: My C program does not compile or gives segmentation fault
Date 2017-03-24 19:16 +0100
Organization A noiseless patient Spider
Message-ID <ob3nkf$pnc$1@dont-email.me> (permalink)
References (15 earlier) <fd4449d0-cadc-4d8a-892b-b685d7dc04d7@googlegroups.com> <ob3imv$7eq$2@jstuckle.eternal-september.org> <c0e06554-eafe-4937-87d5-2b02829a0227@googlegroups.com> <ob3m0b$jtr$1@dont-email.me> <ob3mt6$n5v$1@dont-email.me>

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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.

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.

> 
>> In my opinion, the problem does not lie in casting or not casting the
>> result of malloc - it lies in the separation of the definition of "p"
>> from its assignment.  And the solution is to write your mallocs in the
>> form "widget *p = malloc(sizeof *p);"  - then there is no doubt about
>> your types, your sizes, or what you are actually dealing with at that
>> point in the code.
> 
> The minute you're talking about variables which are members of structs
> (a VERY common case), it's generally not reasonable to put the
> definition and the assignment in the same place.
> 

Agreed, that makes things a little different.

However, it may well make sense to write:

	widget *p = malloc(sizeof *p);
	if (p) {
		s.widget_ptr = p;
		// ...
	} else {
		panic();
	}

The "best" choice can depend on the code in question.

And as has also been mentioned, factory functions or creator functions
of some kind could easily be a better solution.

> ...
>> You can also write "sizeof(widget)" without worrying about surprises if
>> types change, because you have no choice but to change it on that line
>> anyway.  ...
> 
> "no choice"?? I've seen people make precisely that choice, and
> obviously, the compiler didn't object. It did cause problems during
> testing, of course (but only if the incorrect size was too small).
> 

Fair enough - people can always find ways to choose to write incorrect code!

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Thread

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
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-23 15:59 -0400
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-23 20:40 +0000
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-23 22:06 +0100
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-23 20:43 -0400
                Re: My C program does not compile or gives segmentation fault Ian Collins <ian-news@hotmail.com> - 2017-03-24 14:09 +1300
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-23 21:28 -0400
                Re: My C program does not compile or gives segmentation fault Ian Collins <ian-news@hotmail.com> - 2017-03-24 14:33 +1300
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 09:23 -0400
                Re: My C program does not compile or gives segmentation fault Ian Collins <ian-news@hotmail.com> - 2017-03-25 08:39 +1300
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 20:40 -0400
                Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 19:48 -0600
                Re: My C program does not compile or gives segmentation fault John Bode <jfbode1029@gmail.com> - 2017-03-24 13:32 -0700
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 20:42 -0400
                Re: My C program does not compile or gives segmentation fault Tim Rentsch <txr@alumni.caltech.edu> - 2017-04-17 06:30 -0700
                Re: My C program does not compile or gives segmentation fault Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-03-23 19:29 -0600
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 10:10 +0000
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 09:26 -0400
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 13:52 +0000
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 10:30 -0400
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 14:37 +0000
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 12:51 -0400
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 18:05 +0000
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 15:09 -0400
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 12:55 -0400
                Re: My C program does not compile or gives segmentation fault jameskuyper@verizon.net - 2017-03-24 09:45 -0700
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 12:52 -0400
                Re: My C program does not compile or gives segmentation fault jameskuyper@verizon.net - 2017-03-24 10:10 -0700
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-24 18:48 +0100
                Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-03-24 14:04 -0400
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-24 19:16 +0100
                Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-03-24 15:10 -0400
                Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-03-24 15:17 -0400
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-25 00:49 +0100
                Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-03-24 21:10 -0400
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-25 02:37 +0100
                Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-03-24 21:45 -0400
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                Re: My C program does not compile or gives segmentation fault raltbos@xs4all.nl (Richard Bos) - 2017-03-25 10:16 +0000
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-25 12:32 +0000
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-25 15:17 +0100
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-25 16:32 +0000
                Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-25 10:15 -0700
                Re: My C program does not compile or gives segmentation fault "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-25 14:07 -0400
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-25 18:23 +0000
                Re: My C program does not compile or gives segmentation fault Ike Naar <ike@iceland.freeshell.org> - 2017-03-25 18:48 +0000
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                Re: My C program does not compile or gives segmentation fault raltbos@xs4all.nl (Richard Bos) - 2017-03-25 21:28 +0000
                Re: My C program does not compile or gives segmentation fault "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-25 19:16 -0400
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-26 08:53 +0100
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                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-27 08:18 +0100
                Re: My C program does not compile or gives segmentation fault Ike Naar <ike@iceland.freeshell.org> - 2017-03-26 11:37 +0000
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-27 08:19 +0100
                Re: My C program does not compile or gives segmentation fault Ike Naar <ike@iceland.freeshell.org> - 2017-03-27 21:53 +0000
                Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-27 16:22 -0700
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-27 08:18 +0100
                Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-27 08:49 -0700
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                Re: My C program does not compile or gives segmentation fault GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-27 18:19 +0200
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                Re: My C program does not compile or gives segmentation fault BartC <bc@freeuk.com> - 2017-03-27 17:56 +0100
                Re: My C program does not compile or gives segmentation fault asetofsymbols@gmail.com - 2017-04-01 12:42 -0700
                Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-27 09:36 -0700
                Re: My C program does not compile or gives segmentation fault scott@slp53.sl.home (Scott Lurndal) - 2017-03-27 17:51 +0000
                Re: My C program does not compile or gives segmentation fault "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-27 13:59 -0400
                Re: My C program does not compile or gives segmentation fault scott@slp53.sl.home (Scott Lurndal) - 2017-03-27 19:00 +0000
                Re: My C program does not compile or gives segmentation fault "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-27 15:13 -0400
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                Re: My C program does not compile or gives segmentation fault "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-03 14:02 -0400
                Re: My C program does not compile or gives segmentation fault raltbos@xs4all.nl (Richard Bos) - 2017-04-14 11:24 +0000
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-04-14 18:39 +0100
                Re: My C program does not compile or gives segmentation fault James Kuyper <jameskuyper@verizon.net> - 2017-04-14 14:38 -0400
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                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-04-23 17:38 +0100
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                Re: My C program does not compile or gives segmentation fault "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-27 15:40 -0400
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                Re: My C program does not compile or gives segmentation fault Keith Thompson <kst-u@mib.org> - 2017-03-26 02:35 -0700
                Re: My C program does not compile or gives segmentation fault David Brown <david.brown@hesbynett.no> - 2017-03-26 17:19 +0200
                Re: My C program does not compile or gives segmentation fault Richard Heathfield <rjh@cpax.org.uk> - 2017-03-27 08:15 +0100
                Re: My C program does not compile or gives segmentation fault Jerry Stuckle <jstucklex@attglobal.net> - 2017-03-24 15:12 -0400
                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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