Buggy fmemopen

[lumumba]

This function causes SIGSEGV when it's called with buf == NULL. Also it
returns EINVAL with mode != "a".
It appears it wasn't tested with buf == NULL at all:
fmemopen.c:309
  if (!buf)
    {
      /* r+/w+/a+, and no buf: file starts empty.  */
      c->buf = (char *) (c + 1);
      *(char *) buf = '\0'; // Should be c->buf?
      c->pos = c->eof = 0;
      c->append = (flags & __SAPP) != 0;
    }
This condition looks strange:
fmemopen.c:284
  if (!size || !(buf || flags & __SAPP)) // Why?
    {
      ptr->_errno = EINVAL;
      return NULL;
    }

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