X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=lib%2Ffwritable.c;h=e1e5b49e7452a7fff6288ead337829e0cc57c56b;hb=1276a2c5f24c0c932426aca9c899fa524d2443f2;hp=2885deabecef953fadbc87e909e570fec207f6ad;hpb=d1b26967b8d0882441359644bd9122345bd2b03a;p=gnulib.git

diff --git a/lib/fwritable.c b/lib/fwritable.c
index 2885deabe..e1e5b49e7 100644
--- a/lib/fwritable.c
+++ b/lib/fwritable.c
@@ -1,38 +1,63 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2014 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
-   You should have received a copy of the GNU General Public License along
-   with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
 /* Specification.  */
 #include "fwritable.h"
 
+#include "stdio-impl.h"
+
+#if defined EPLAN9                  /* Plan9 */
+# include <fcntl.h>
+#endif
+
 bool
 fwritable (FILE *fp)
 {
   /* Most systems provide FILE as a struct and the necessary bitmask in
      <stdio.h>, because they need it for implementing getc() and putc() as
      fast macros.  */
-#if defined _IO_ferror_unlocked     /* GNU libc, BeOS */
+#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
   return (fp->_flags & _IO_NO_WRITES) == 0;
-#elif defined __sferror             /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
-  return (fp->_flags & (__SRW | __SWR)) != 0;
-#elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
+#elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
+  return (fp_->_flags & (__SRW | __SWR)) != 0;
+#elif defined __EMX__               /* emx+gcc */
+  return (fp->_flags & (_IORW | _IOWRT)) != 0;
+#elif defined __minix               /* Minix */
+  return (fp->_flags & _IOWRITE) != 0;
+#elif defined _IOERR                /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
   return (fp->_flag & (_IORW | _IOWRT)) != 0;
+#elif defined __QNX__               /* QNX */
+  return (fp->_Mode & 0x2 /* _MOPENW */) != 0;
+#elif defined __MINT__              /* Atari FreeMiNT */
+  return fp->__mode.__write;
+#elif defined EPLAN9                /* Plan9 */
+  int fd = fp->fd;
+  if (fd >= 0)
+    {
+      int flags = fcntl (fd, F_GETFL, NULL);
+      if (flags >= 0)
+        {
+          flags &= O_ACCMODE;
+          return (flags == O_WRONLY || flags == O_RDWR);
+        }
+    }
+  return 0;
 #else
- #error "Please port gnulib fwritable.c to your platform!"
+# error "Please port gnulib fwritable.c to your platform! Look at the definition of fopen, fdopen on your system, then report this to bug-gnulib."
 #endif
 }