Review Request 125515: Preserve relative link targets when copying symlinks.

[David Faure]

> On Oct. 4, 2015, 5:45 p.m., Frank Reininghaus wrote:
> > Looks good! The only thing that I'm not sure about is whether 1000 bytes are guaranteed to be enough. Some quick Googling tells me that path lengths of 4096 are possible. Maybe we could allocate a temporary large array on the heap if the readlink call fails with the 1000 byte buffer on the stack?
> 
> Xuetian Weng wrote:
>     Just FYI, even PATH_MAX may not exists on some system (AFAIK, hurd, allowed by posix).
>     And though st.st_size is mentioned in readlink man page, it may not return useful value.
>     
>     
>     More information http://stackoverflow.com/questions/9385386/howto-use-readlink-with-dynamic-memory-allocation

Just for info, I basically restored this code from kdelibs4 :)
But of course I could have a missed a bug report about someone with a huge symlink target.

Checking what Qt does... ah, PATH_MAX if defined, otherwise a loop which reallocs twice more every time (starting from 256 bytes).
Personally I'm tempted to just make it 4096, "it ought to be enough for everybody" as the saying goes :-)


- David


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On Oct. 4, 2015, 9:24 a.m., David Faure wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/125515/
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> 
> (Updated Oct. 4, 2015, 9:24 a.m.)
> 
> 
> Review request for KDE Frameworks.
> 
> 
> Bugs: 352927
>     https://bugs.kde.org/show_bug.cgi?id=352927
> 
> 
> Repository: kio
> 
> 
> Description
> -------
> 
> BUG: 352927
> Change-Id: I7d3c988da32cae9d14750c8adb9ca5af6d140572
> 
> 
> Diffs
> -----
> 
>   autotests/jobtest.h ef8c3e111ec647cc59c5a9715ab3220ce1651c9e 
>   src/ioslaves/file/file.cpp a0a533c957628b00eff175a949685d4497c5f095 
>   autotests/jobtest.cpp c24bcead70f78f2bec3b938819fb2fa842e937d5 
> 
> Diff: https://git.reviewboard.kde.org/r/125515/diff/
> 
> 
> Testing
> -------
> 
> 2 unit tests added
> 
> 
> Thanks,
> 
> David Faure
> 
>

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