bugwdiff - Bugs: bug #25883, Better handling of non-seekable...


bug #25883: Better handling of non-seekable input

Submitter:  Martin von Gagern <gagern>
Submitted:  Mon 16 Mar 2009 11:12:37 AM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  Fixed
Privacy:  Public Assigned to:  gagern
Originator Name:  Open/Closed:  Closed
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Tue 15 Dec 2009 05:12:12 PM UTC, comment #1: 

Fix comitted, will be included in next release.

Martin von Gagern <gagern>
Project Administrator
Mon 16 Mar 2009 11:12:37 AM UTC, original submission:  

I tend to use shell process substitutions a lot with diff. However, when I try to do the same with wdiff, I loose output without any indication that anything might have gone wrong. To test this, try the following:
wdiff <(echo here foo there) <(echo here bar there)

The primary cause of this is that this kind of input is not seekable. wdiff already contains some code to copy input to a temporary file, but it uses that method only for stdin.

The attached patch checks whether or not a stream is seekable, and copies it to a temporary buffer if not. With this patch in place, the above command produces the expected output. As an added benefit, in cases where stdin is seekable, unnecessary buffering is avoided, though this case is probably rare.

Martin von Gagern <gagern>
Project Administrator


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Attach Files:

Attached Files
file #17705:  NonSeekableInput.patch added by gagern (3KiB - application/octet-stream)


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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2009-12-15 gagern StatusNone Fixed
        Assigned toNone gagern
        Open/ClosedOpen Closed
    2009-03-16 gagern Attached File- Added NonSeekableInput.patch, #17705

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