X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffreadahead.c;h=f2dae46bf3bc8312bde2391fcf1c1a6955ea157b;hb=164ebfe612d8460c15d7acf1927faef6943571b6;hp=da1ac780b644610460e8bbb1db78ab2ffe31ba3d;hpb=d4d84c1d916f5bff3bb72be92e9d1383a25077c1;p=gnulib.git

diff --git a/lib/freadahead.c b/lib/freadahead.c
index da1ac780b..f2dae46bf 100644
--- a/lib/freadahead.c
+++ b/lib/freadahead.c
@@ -1,5 +1,5 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007-2011 Free Software Foundation, Inc.
+   Copyright (C) 2007-2013 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -31,7 +31,7 @@ freadahead (FILE *fp)
   return (fp->_IO_read_end - fp->_IO_read_ptr)
          + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
             0);
-#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
   if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)
     return 0;
 # if defined __DragonFly__
@@ -80,6 +80,10 @@ freadahead (FILE *fp)
   return (fp->__pushed_back
           ? fp->__get_limit - fp->__pushback_bufp + 1
           : fp->__get_limit - fp->__bufp);
+#elif defined EPLAN9                /* Plan9 */
+  if (fp->state == 4 /* WR */ || fp->rp >= fp->wp)
+    return 0;
+  return fp->wp - fp->rp;
 #elif defined SLOW_BUT_NO_HACKS     /* users can define this */
   abort ();
   return 0;