Austin Group Defect Tracker

Aardvark Mark IV

Main | My View | View Issues | Change Log | Docs
  

Viewing Issue Simple Details [ Jump to Notes ] [ Issue History ] [ Print ]
ID Category Severity Type Date Submitted Last Update
0000417 [1003.1(2008)/Issue 7] Shell and Utilities Editorial Clarification Requested 2011-04-22 23:11 2013-04-16 13:06
Reporter jilles View Status public  
Assigned To ajosey
Priority normal Resolution Accepted As Marked  
Status Closed  
Name Jilles Tjoelker
Organization
User Reference
Section 2.6.2 Parameter Expansion
Page Number 2306-2307
Line Number 72725-72729, 72747-72749
Interp Status Approved
Final Accepted Text See Note: 0000800
Summary 0000417: ${#?} is ambiguous
Description The expansion ${#?} can be interpreted both as the length of $? and as $# giving an error in the (impossible) case that it is not set.

That is ${#parameter} with parameter "?" or ${parameter?[word]} with parameter "#" and no word.

Because the former interpretation is most common and the only one which
may have some use, I would suggest requiring that one.

If word is to be made optional in other forms of parameter expansion as well, similar problems will arise with ${#-} and ${##}.
Desired Action After the paragraph about ${parameter:?[word]}, add something like:

If parameter is '#', word must be specified.
This is necessary to avoid ambiguity with the string length expansion.

Alternatively, it could be left unspecified by also adding restrictions
which special parameters ${#parameter} may be applied to.
Tags tc1-2008
Attached Files

- Relationships
related to 0000457Closedajosey omitted word in parameter expansions 

-  Notes
(0000800)
nick (manager)
2011-06-02 16:01
edited on: 2011-06-02 16:06

 Interpretation response
------------------------
The standard is unclear on this issue, and no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor.

Rationale:
-------------
The expansion ${#?} can be interpreted both as the length of $? and as $# giving an error in the (impossible) case that it is not set.


Notes to the Editor (not part of this interpretation):
-------------------------------------------------------
At line 72734 insert a sentence before "The following table summarizes ...":

If parameter is '#' and the colon is omitted, the application shall ensure that word is specified (this is necessary to avoid ambiguity with the string length expansion).
(0000849)
ajosey (manager)
2011-06-16 10:17

 Interpretation proposed 16 June 2011 for final 30 day review
(0000903)
ajosey (manager)
2011-07-29 06:13

 The interpretation is now approved.

- Issue History
Date Modified Username Field Change
2011-04-22 23:11 jilles New Issue
2011-04-22 23:11 jilles Status New => Under Review
2011-04-22 23:11 jilles Assigned To => ajosey
2011-04-22 23:11 jilles Name => Jilles Tjoelker
2011-04-22 23:11 jilles Section => 2.6.2 Parameter Expansion
2011-04-22 23:11 jilles Page Number => 2306-2307
2011-04-22 23:11 jilles Line Number => 72725-72729, 72747-72749
2011-06-02 16:01 nick Note Added: 0000800
2011-06-02 16:03 nick Note Edited: 0000800
2011-06-02 16:05 nick Interp Status => ---
2011-06-02 16:05 nick Final Accepted Text => See Note: 0000800
2011-06-02 16:05 nick Status Under Review => Interpretation Required
2011-06-02 16:05 nick Resolution Open => Accepted As Marked
2011-06-02 16:06 nick Note Edited: 0000800
2011-06-02 16:06 nick Note Edited: 0000800
2011-06-02 16:07 nick Tag Attached: tc1-2008
2011-06-02 16:07 nick Interp Status --- => Pending
2011-06-03 18:24 eblake Relationship added related to 0000457
2011-06-16 10:17 ajosey Interp Status Pending => Proposed
2011-06-16 10:17 ajosey Note Added: 0000849
2011-07-29 06:13 ajosey Interp Status Proposed => Approved
2011-07-29 06:13 ajosey Note Added: 0000903
2013-04-16 13:06 ajosey Status Interpretation Required => Closed

Mantis 1.1.6[^]
Copyright © 2000 - 2008 Mantis Group
Powered by Mantis Bugtracker