Implement freading and fwriting.

* lib/freading.c: New file.
* lib/freading.h: Likewise.
* m4/freading.m4: Likewise.
* modules/freading: Likewise.
* modules/freading-tests: Likewise.
* tests/test-freading.c: Likewise.
* lib/fwriting.c: New file.
* lib/fwriting.h: Likewise.
* m4/fwriting.m4: Likewise.
* modules/fwriting: Likewise.
* modules/fwriting-tests: Likewise.
* tests/test-fwriting.c: Likewise.
* MODULES.html.sh (File stream based Input/Output): Mention them.

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/freading.h b/lib/freading.h
new file mode 100644
index 0000000000..e0db1f7d05
--- /dev/null
+++ b/lib/freading.h
@@ -0,0 +1,44 @@
+/* Retrieve information about a FILE stream.
+   Copyright (C) 2007 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 2, 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.  */
+
+#include <stdbool.h>
+#include <stdio.h>
+
+/* 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
+   supports writing and the last operation on it was a write operation or
+   there was no such operation.
+   STREAM must not be wide-character oriented.  */
+
+#if HAVE___FREADING && !defined __GLIBC__ /* Solaris >= 7, not glibc >= 2.2  */
+
+# include <stdio_ext.h>
+# define freading(stream) (__freading (stream) != 0)
+
+#else
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+extern bool freading (FILE *stream);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif