1 files changed, 53 insertions, 0 deletions
diff --git a/lib/fwriting.h b/lib/fwriting.h
new file mode 100644
index 0000000..13415b9
--- /dev/null
+++ b/lib/fwriting.h
@@ -0,0 +1,53 @@
+/* Retrieve information about a FILE stream.
+   Copyright (C) 2007, 2009-2012 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
+   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, 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 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, musl libc */
+
+# include <stdio_ext.h>
+# define fwriting(stream) (__fwriting (stream) != 0)
+
+#else
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+extern bool fwriting (FILE *stream);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif