Re: operator precedence

From	Ben <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: operator precedence
Date	2022-04-15 19:25 +0100
Organization	A noiseless patient Spider
Message-ID	<87mtgmp5kr.fsf@bsb.me.uk> (permalink)
References	(1 earlier) <t2v61c$ej9$1@gioia.aioe.org> <87bkx868cm.fsf@bsb.me.uk> <t31tda$1ohm$1@gioia.aioe.org> <878rsb4b8g.fsf@bsb.me.uk> <t3c9vm$d1r$1@gioia.aioe.org>

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Guillaume <message@bottle.org> writes:

> Le 11/04/2022 à 22:27, Ben a écrit :
>> I shall have to remain in the dark then about what you consider a good
>> start because the quote "Limited dependence should be placed on operator
>> precedence rules in expressions" I think MISRA costs money.
>
> If you use MISRA in a professional context, you should of course buy a
> copy, but if you're just curious or it's for your own personal use,
> then it's easy to get ahold of a copy.
>
> But I explicitely mentioned the rule number that applied here, and
> with this number, you'll find the details online very easily without
> needing to get the whole document.

I didn't succeed.  Only spent a few minutes but all I could find is
people quoting some (or many all of) that rule in compliance statements.

One says:

  "MISRA C:2012 Rule 12.1: The precedence of operators within
  expressions should be made explicit"

but that can't be the whole rule and, as quoted, it sounds very odd.

> The same kind of issue can be found here:
> https://cwe.mitre.org/data/definitions/783.html , and this rule is
> also part of CERT-C.

I could not find a rule on that page, but then it has a lot of detailed
content.  I found "Potential mitigations":

  "Regularly wrap sub-expressions in parentheses, especially in
  security-critical code."

but that hardly helps to know where anyone draws the line.

-- 
Ben.

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Thread

Re: operator precedence Guillaume <message@bottle.org> - 2022-04-10 20:01 +0200
  Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-10 20:34 +0100
    Re: operator precedence Guillaume <message@bottle.org> - 2022-04-11 20:52 +0200
      Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-11 21:27 +0100
        Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-14 13:38 +0200
          Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-14 14:07 +0100
            Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-18 14:00 +0200
        Re: operator precedence Guillaume <message@bottle.org> - 2022-04-15 19:28 +0200
          Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-15 19:25 +0100
            Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-18 14:12 +0200
              Re: operator precedence Kaz Kylheku <480-992-1380@kylheku.com> - 2022-04-18 16:38 +0000
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-18 19:20 +0200
                Re: operator precedence Kaz Kylheku <480-992-1380@kylheku.com> - 2022-04-19 17:40 +0000
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-19 22:41 +0200
              Re: operator precedence James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-18 23:08 -0400
                Re: operator precedence Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-04-25 08:40 -0700
                Re: operator precedence "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2022-04-25 10:35 -0700
  Re: operator precedence Vir Campestris <vir.campestris@invalid.invalid> - 2022-04-10 21:51 +0100
  Re: operator precedence Bonita Montero <Bonita.Montero@gmail.com> - 2022-04-11 11:35 +0200
  Re: operator precedence gazelle@shell.xmission.com (Kenny McCormack) - 2022-04-11 13:53 +0000
  Re: operator precedence Guillaume <message@bottle.org> - 2022-04-11 20:36 +0200
  Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-14 13:14 +0200
  Re: operator precedence Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-04-25 11:10 -0700
    Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-25 20:52 +0200
      Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-25 21:18 +0100
        Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-26 15:30 +0200
          Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-26 15:58 +0100
            Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-26 21:19 +0200
              Re: operator precedence Sams Lara <samlara622@gmail.com> - 2022-04-27 02:15 +0100
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-27 09:13 +0200
                Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-27 19:43 +0100
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-28 10:09 +0200
                Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-28 10:44 +0100
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-28 11:59 +0200
                Re: operator precedence Giovanni <lsodgf0@home.net.it> - 2022-04-28 12:29 +0200
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-28 12:56 +0200
                Re: operator precedence Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-04-28 04:17 -0700
                Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-28 12:24 +0100
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-28 14:28 +0200
                Re: operator precedence Dan Purgert <dan@djph.net> - 2022-04-28 14:00 +0000
                Re: operator precedence Dan Purgert <dan@djph.net> - 2022-04-28 14:38 +0000
                Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-28 20:36 +0100
                Re: operator precedence Richard Harnden <richard.nospam@gmail.com> - 2022-04-28 21:22 +0100
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-29 09:43 +0200
                Re: operator precedence Kaz Kylheku <480-992-1380@kylheku.com> - 2022-04-28 20:51 +0000
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-29 10:04 +0200
                Re: operator precedence Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-04-29 03:01 -0700
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-29 15:02 +0200
                Re: operator precedence James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-04-29 10:48 -0400
                Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-29 17:29 +0200
            Re: operator precedence bart c <bart4858@gmail.com> - 2022-04-26 14:30 -0700
              Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-27 00:00 +0100
              Re: operator precedence David Brown <david.brown@hesbynett.no> - 2022-04-27 09:46 +0200
          Re: operator precedence Öö Tiib <ootiib@hot.ee> - 2022-04-27 00:10 -0700
    Re: operator precedence scott@slp53.sl.home (Scott Lurndal) - 2022-04-25 19:02 +0000
      Re: operator precedence Ben <ben.usenet@bsb.me.uk> - 2022-04-25 21:38 +0100
        Re: operator precedence Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-04-25 22:22 -0700

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