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Re: htons, htonl, ntohs, ntohl

From James Kuyper <jameskuyper@verizon.net>
Newsgroups comp.lang.c
Subject Re: htons, htonl, ntohs, ntohl
Date 2013-08-23 12:27 -0400
Organization Self
Message-ID <52178D80.5030302@verizon.net> (permalink)
References <kv7jr7$eig$1@dont-email.me> <kv7lfd$m38$1@dont-email.me> <lnr4dke7w7.fsf@nuthaus.mib.org>

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On 08/23/2013 11:36 AM, Keith Thompson wrote:
> James Kuyper <jameskuyper@verizon.net> writes:
>> On 08/23/2013 08:17 AM, James Harris wrote:
>> ...
>>> 1. htons doesn't address the issue of communicating with a machine
>>> which has a different idea of the size of a short. AIUI a short on
>>> one machine might be 16-bit but on another 64-bit. (Hence it's poorly
>>> specified.)
>>
>> POSIX requires that htons be declared as
>>      uint16_t htons(uint16_t hostshort);
>>
>> uint16_t is required to have exactly 16 bits, and the size of a short is
>> irrelevant. If your system has a declaration that is in terms of short
>> int, then it's a different htons(), one that doesn't conform to POSIX,
>> at least not to the current version.
> 
> It could conform to POSIX on a system where uint16_t is a typedef for
> unsigned short (since typedefs, as you know, don't create new types).

You're right, of course. I was thinking mainly in terms of cases like
James Harris' hypothetical 64-bit short, for which that would not be
possible.

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htons, htonl, ntohs, ntohl "James Harris" <james.harris.1@gmail.com> - 2013-08-23 13:17 +0100
  Re: htons, htonl, ntohs, ntohl Siri Cruise <chine.bleu@yahoo.com> - 2013-08-23 05:34 -0700
  Re: htons, htonl, ntohs, ntohl James Kuyper <jameskuyper@verizon.net> - 2013-08-23 08:44 -0400
    Re: htons, htonl, ntohs, ntohl Keith Thompson <kst-u@mib.org> - 2013-08-23 08:36 -0700
      Re: htons, htonl, ntohs, ntohl James Kuyper <jameskuyper@verizon.net> - 2013-08-23 12:27 -0400
  Re: htons, htonl, ntohs, ntohl Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2013-08-23 09:52 -0600
    Re: htons, htonl, ntohs, ntohl glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-08-23 18:04 +0000
      Re: htons, htonl, ntohs, ntohl Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2013-08-23 15:24 -0600
        Re: htons, htonl, ntohs, ntohl Ian Collins <ian-news@hotmail.com> - 2013-08-24 11:22 +1200
        Re: htons, htonl, ntohs, ntohl glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-08-26 01:55 +0000
          Re: htons, htonl, ntohs, ntohl James Kuyper <jameskuyper@verizon.net> - 2013-08-25 22:03 -0400
          Re: htons, htonl, ntohs, ntohl Richard Damon <Richard@Damon-Family.org> - 2013-08-25 22:03 -0400
          Re: htons, htonl, ntohs, ntohl Ian Collins <ian-news@hotmail.com> - 2013-08-26 14:10 +1200
    Re: htons, htonl, ntohs, ntohl "James Harris" <james.harris.1@gmail.com> - 2013-08-23 21:16 +0100
      Re: htons, htonl, ntohs, ntohl Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2013-08-25 13:54 -0600
    Re: htons, htonl, ntohs, ntohl christian.bau@cbau.wanadoo.co.uk - 2013-08-30 10:58 -0700
      Re: htons, htonl, ntohs, ntohl Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2013-08-30 12:37 -0600
        Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-31 17:03 +0000
          Re: htons, htonl, ntohs, ntohl glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-08-31 18:13 +0000
            Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-31 20:52 +0000
          Re: htons, htonl, ntohs, ntohl Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2013-08-31 14:08 -0600
  Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-27 13:54 +0000
    Re: htons, htonl, ntohs, ntohl Stephen Sprunk <stephen@sprunk.org> - 2013-08-27 10:53 -0500
      Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-27 22:00 +0000
        Re: htons, htonl, ntohs, ntohl "James Harris" <james.harris.1@gmail.com> - 2013-08-27 23:15 +0100
          Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-28 11:10 +0000
            Re: htons, htonl, ntohs, ntohl James Kuyper <jameskuyper@verizon.net> - 2013-08-28 07:20 -0400
              Re: htons, htonl, ntohs, ntohl "James Harris" <james.harris.1@gmail.com> - 2013-08-28 12:47 +0100
                Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-31 16:40 +0000
      Re: htons, htonl, ntohs, ntohl "James Harris" <james.harris.1@gmail.com> - 2013-08-27 23:36 +0100
        Re: htons, htonl, ntohs, ntohl James Kuyper <jameskuyper@verizon.net> - 2013-08-27 18:54 -0400
        Re: htons, htonl, ntohs, ntohl Stephen Sprunk <stephen@sprunk.org> - 2013-08-27 21:02 -0500
          Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-28 14:10 +0000
            Re: htons, htonl, ntohs, ntohl Stephen Sprunk <stephen@sprunk.org> - 2013-08-28 15:06 -0500
            Re: htons, htonl, ntohs, ntohl christian.bau@cbau.wanadoo.co.uk - 2013-08-30 10:42 -0700
              Re: htons, htonl, ntohs, ntohl Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-08-31 11:49 +0000

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