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Groups > comp.lang.c > #23996

Re: casting unsigned int to void*

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On 07/30/2012 04:04 PM, China Blue [Tor], Meersburg wrote:
...
> intptr_t is an integer which is large enough to hold a void* pointer encoded in 
> an integer. This is an ancient bug dating back to the days when an integer was 
> 60 bits, would always be 60 bits, and an address was 18 bits, and would always 

Your descriptions seem highly platform-specific; I'm not familiar with a
platform that had those particular characteristics. Could you identify it?

> be 18 bits. The 80x86s had addresses (20 bits) larger than ints (16 bits), 
> exposing this bad assumption.  The intptr_t was eventually introduced to provide 
> an integer that would always be safe to hold addresses.

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casting unsigned int to void* Fred K <fred.l.kleinschmidt@gmail.com> - 2012-07-30 10:33 -0700
  Re: casting unsigned int to void* Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-30 13:59 -0400
    Re: casting unsigned int to void* falk@rahul.net (Edward A. Falk) - 2012-07-30 19:03 +0000
  Re: casting unsigned int to void* James Kuyper <jameskuyper@verizon.net> - 2012-07-30 14:14 -0400
    Re: casting unsigned int to void* Fred K <fred.l.kleinschmidt@gmail.com> - 2012-07-30 11:23 -0700
      Re: casting unsigned int to void* pacman@kosh.dhis.org (Alan Curry) - 2012-07-30 18:46 +0000
        Re: casting unsigned int to void* Fred K <fred.l.kleinschmidt@gmail.com> - 2012-07-30 12:09 -0700
          Re: casting unsigned int to void* Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-30 21:02 +0100
  Re: casting unsigned int to void* bartek szurgot <basz@no.spam> - 2012-07-30 20:47 +0200
  Re: casting unsigned int to void* "China Blue [Tor], Meersburg" <chine.bleu@yahoo.com> - 2012-07-30 13:04 -0700
    Re: casting unsigned int to void* James Kuyper <jameskuyper@verizon.net> - 2012-07-30 16:22 -0400
      Re: casting unsigned int to void* "China Blue [Tor], Meersburg" <chine.bleu@yahoo.com> - 2012-07-30 14:55 -0700
        Re: casting unsigned int to void* James Kuyper <jameskuyper@verizon.net> - 2012-07-30 18:15 -0400
          Re: casting unsigned int to void* "China Blue [Tor], Meersburg" <chine.bleu@yahoo.com> - 2012-07-30 15:18 -0700
            Re: casting unsigned int to void* Mark Bluemel <mark_bluemel@pobox.com> - 2012-07-31 08:30 +0100
              Re: casting unsigned int to void* "China Blue [Tor], Meersburg" <chine.bleu@yahoo.com> - 2012-07-31 01:17 -0700
    Re: casting unsigned int to void* Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-30 23:36 +0100
    Re: casting unsigned int to void* Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-30 20:45 -0400
      Re: casting unsigned int to void* James Kuyper <jameskuyper@verizon.net> - 2012-07-31 07:23 -0400
  Re: casting unsigned int to void* Keith Thompson <kst-u@mib.org> - 2012-07-30 16:28 -0700
  Re: casting unsigned int to void* James Kuyper <jameskuyper@verizon.net> - 2012-07-31 07:26 -0400
    Re: casting unsigned int to void* 88888 Dihedral <dihedral88888@googlemail.com> - 2012-08-05 09:16 -0700
      Re: casting unsigned int to void* Ike Naar <ike@sdf.lonestar.org> - 2012-08-05 20:50 +0000
        Re: casting unsigned int to void* Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-08-10 11:05 +0300

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