[Bug libc/13151] New: fmemopen streams fail to read eof

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

http://sourceware.org/bugzilla/show_bug.cgi?id=13151

             Bug #: 13151
           Summary: fmemopen streams fail to read eof
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: bugdal@aerifal.cx
    Classification: Unclassified


Streams obtained by fmemopen fail to yield EOF when attempting to read past the
"current size" of the buffer. Minimal failure case:

FILE *f = fmemopen((char[10]){"hello"}, 10, "a+");
assert(getc(f)==EOF);

(The "current size" established by opening in append mode is the offset of the
null byte, 5.)

Reference:

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

I understand that the GNU fmemopen predated the standardized function, and I'm
not sure what politics were involved in writing the standard such that the
existing GNU version did not conform. Nonetheless, this should be fixed. If you
want to keep the original GNU behavior, there should be a separate
__posix_fmemopen that gets used when _POSIX_C_SOURCE >= 200809L.

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