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ID Category Severity Type Date Submitted Last Update
0000571 [1003.1(2008)/Issue 7] System Interfaces Objection Clarification Requested 2012-05-30 14:50 2019-06-10 08:55
Reporter geoffclare View Status public  
Assigned To ajosey
Priority normal Resolution Accepted As Marked  
Status Closed  
Name Geoff Clare
Organization The Open Group
User Reference
Section getdelim
Page Number 1005
Line Number 33753
Interp Status Approved
Final Accepted Text See Note: 0001246
Summary 0000571: getdelim() end-of-file behaviour needs clarifying
Description The RETURN VALUE section for getdelim() states:

    If no characters were read, and the end-of-file indicator for
    the stream is set, or if the stream is at end-of-file, the
    end-of-file indicator for the stream shall be set and the
    function shall return -1.

It is not clear from this what happens if the end-of-file indicator
is already set, and the stream is not at end-of-file, before the
call. The inclusion of the "no characters were read" condition
could be taken as implying that when the end-of-file indicator is
set getdelim() can attempt to read some characters and only needs
to return -1 if it does not read any. However, XSH Section 2.5
states "All input takes place as if bytes were read by successive
calls to fgetc()", and fgetc() is required to return EOF when the
eof-of-file indicator is set regardless of whether the stream is
at end-of-file. Therefore, in fact getdelim() is required not to
try to read any characters and the "no characters were read"
condition will always be true if the end-of-file indicator is
already set.

This is consistent with the "sticky end-of-file" behaviour of all
the C99 stdio input functions.
Desired Action Change:

    If no characters were read, and the end-of-file indicator for the
    stream is set, or if the stream is at end-of-file, the end-of-file
    indicator for the stream shall be set and the function shall
    return -1.

to:

    If the end-of-file indicator for the stream is set, or if no
    characters were read and the stream is at end-of-file, the
    end-of-file indicator for the stream shall be set and the
    function shall return -1.
Tags tc2-2008
Attached Files

- Relationships

-  Notes
(0001246)
Don Cragun (manager)
2012-05-31 15:44

 Interpretation response
------------------------

The standard does not speak to this issue, and as such no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor.

Rationale:
-------------
We believe that this has always been the expected behavior and that existing implementations already behave as suggested.

Notes to the Editor (not part of this interpretation):
-------------------------------------------------------
Make the changes suggested in the Desired Action.
(0001285)
ajosey (manager)
2012-06-29 16:14

 Interpretation proposed 29 June 2012 for final 45 day review
(0001348)
ajosey (manager)
2012-08-30 09:12

 Interpretation approved 30 Aug 2012

- Issue History
Date Modified Username Field Change
2012-05-30 14:50 geoffclare New Issue
2012-05-30 14:50 geoffclare Status New => Under Review
2012-05-30 14:50 geoffclare Assigned To => ajosey
2012-05-30 14:50 geoffclare Name => Geoff Clare
2012-05-30 14:50 geoffclare Organization => The Open Group
2012-05-30 14:50 geoffclare Section => getdelim
2012-05-30 14:50 geoffclare Page Number => 1005
2012-05-30 14:50 geoffclare Line Number => 33753
2012-05-30 14:50 geoffclare Interp Status => ---
2012-05-31 15:44 Don Cragun Final Accepted Text => See Note: 0001246
2012-05-31 15:44 Don Cragun Note Added: 0001246
2012-05-31 15:44 Don Cragun Status Under Review => Interpretation Required
2012-05-31 15:44 Don Cragun Resolution Open => Accepted
2012-05-31 15:44 Don Cragun Tag Attached: tc2-2008
2012-05-31 15:44 Don Cragun Resolution Accepted => Accepted As Marked
2012-05-31 15:51 Don Cragun Interp Status --- => Pending
2012-06-29 16:14 ajosey Interp Status Pending => Proposed
2012-06-29 16:14 ajosey Note Added: 0001285
2012-08-30 09:12 ajosey Interp Status Proposed => Approved
2012-08-30 09:12 ajosey Note Added: 0001348
2019-06-10 08:55 agadmin Status Interpretation Required => Closed

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