[Bug 785] New: Having identical sort input and output files does not work

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=785

           Summary: Having identical sort input and output files does not
                    work
           Product: Busybox
           Version: 1.15.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: john.ata at baesystems.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Created an attachment (id=811)
 --> (https://bugs.busybox.net/attachment.cgi?id=811)
Delay opening output file until input files are processed

In the busybox sort command, the output file is opened, truncated and
presumably verified before the input files are read and sorted.  This causes
problems when applications intend to sort a file on top of itself (e.g. ctags).
 The provided patch delays the opening/truncation of the output file until
after the input files are read and sorted.  This allows something like:
sort -o F F to sort file F putting the output into F.  This is consistent with
the Linux sort command which for the most part does this as well.  This patch
has been tested on an earlier version of busybox and appears to work well.


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