[Bug libc/13152] New: fmemopen does not honor append mode

["bugdal at aerifal dot cx" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13152

             Bug #: 13152
           Summary: fmemopen does not honor append mode
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: bugdal@aerifal.cx
    Classification: Unclassified


fmemopen sets the initial offset correctly for append mode, but otherwise seems
to treat append mode just like "r+" (read/update) mode. Writes are not forced
to start at the "current size" of the stream, as specified by POSIX:

http://pubs.opengroup.org/onlinepubs/9699919799/functions/fmemopen.html

In other words, opening a stream for append, then seeking to the beginning and
attempting a write overwrites the beginning of the buffer rather than
appending.

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