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List:       busybox-cvs
Subject:    [Bug 9861] New: Posix 12.2 Guideline 9 violation: options parsed after operands (found on awk)
From:       bugzilla () busybox ! net
Date:       2017-05-11 19:19:59
Message-ID: bug-9861-161 () https ! bugs ! busybox ! net/
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https://bugs.busybox.net/show_bug.cgi?id=9861

            Bug ID: 9861
           Summary: Posix 12.2 Guideline 9 violation: options parsed after
                    operands (found on awk)
           Product: Busybox
           Version: 1.23.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned@busybox.net
          Reporter: camerisdump@gmail.com
                CC: busybox-cvs@busybox.net
  Target Milestone: ---

busybox, at least its awk utility, does not conform to Posix 12.2 Guideline 9
(http://pubs.opengroup.org/onlinepubs/9699919799/), options come before
operands, hence arguments after the first operand should not tried to be parsed
as options:  
  $ awk 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -some --args
  awk: invalid option -- s

  $ gawk 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -some --args
  1: -some
  2: --args

the awk-program clearly is the first operand. another example:

  $ awk 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -- -some
--args
  1: -some
  2: --args

  $ gawk 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -- -some
--args
  1: --
  2: -some
  3: --args

workaround, explicitly declare end of options before the program:

  $ awk -- 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -some
--args
  1: -some
  2: --args

  $ gawk -- 'BEGIN { for(i=1; i<ARGC; ++i) { print i ": " ARGV[i] }}' -some
--args
  1: -some
  2: --args

In other words, the first argument that is not an option or option-argument
should have the same effect as encountering the -- argument.

Unfortunatley I can't think of any other utility that could also be affected by
this.

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