pmt: initial 3.0.2 update

include/libgnulib/fwriting.h

@@ -0,0 +1,60 @@
+/* Retrieve information about a FILE stream.
+   Copyright (C) 2007, 2009-2024 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation, either version 3 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* This file uses _GL_ATTRIBUTE_PURE, HAVE___FWRITING, HAVE_STDIO_EXT_H.  */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
+#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, UnixWare >= 7.1.4.MP4, Cygwin >= 1.7.34, Android API >= 29, musl libc */
+
+# if HAVE_STDIO_EXT_H
+#  include <stdio_ext.h>
+# endif
+# define fwriting(stream) (__fwriting (stream) != 0)
+
+#else
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+extern bool fwriting (FILE *stream) _GL_ATTRIBUTE_PURE;
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif