X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffwriting.h;h=156f46f5e70dd3f23644c36664f148a65829c54d;hb=43593319b31e6b0175b8eec4433bac744959822d;hp=07037ef1288eb393e74c767aa43ca0afd4f5695f;hpb=a8f956440539cf954fb92e2396cc58e2a111455f;p=gnulib.git

diff --git a/lib/fwriting.h b/lib/fwriting.h
index 07037ef12..156f46f5e 100644
--- a/lib/fwriting.h
+++ b/lib/fwriting.h
@@ -1,30 +1,39 @@
 /* Retrieve information about a FILE stream.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009-2013 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 <stdbool.h>
 #include <stdio.h>
 
-/* Return true if the stream STREAM is opened write-only or append-only, or
-   if the last operation on the stream was a write operation.  Return false
-   if the stream supports reading and the last operation on it was a read
-   operation or there was no such operation.
+/* Return true if the stream STREAM is opened write-only or
+   append-only, or if the last operation on the stream was a write
+   operation.  Return false if the stream is opened read-only, or if
+   it supports reading and there is no current write 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.
+
    STREAM must not be wide-character oriented.  */
 
-#if HAVE___FWRITING /* glibc >= 2.2, Solaris >= 7 */
+#if HAVE___FWRITING /* glibc >= 2.2, Solaris >= 7, musl libc */
 
 # include <stdio_ext.h>
 # define fwriting(stream) (__fwriting (stream) != 0)