Bug 4359

Created attachment 1679 [details]
source code of test program

Oops, I meant __freading, not __freadable.

While I don't quite see why it's needed (libio simply puts new streams in
read-mode) I added appropriate changes.

Thank you. This change allows to describe what __freading returns in a quite
precise way, as follows. Also, it makes __freading symmetric to __fwriting.


/* Return true if the stream STREAM is opened read-only, or if the
   last operation on the stream was a read operation.  Return false if
   the stream is opened write-only or append-only, or if it supports
   writing and there is no current read operation (such as fputc).

   freading and fwriting will never both be true.  If STREAM supports
   both reads and writes, then:
     - both freading and fwriting might be false when the stream is first
       opened, after read encounters EOF, or after fflush,
     - freading might be false or true and fwriting might be false
       after repositioning (such as fseek, fsetpos, or rewind),
   depending on the underlying implementation.  */
extern int __freading (FILE *stream);