1/* Retrieve information about a FILE stream.
2   Copyright (C) 2007 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#include <stdbool.h>
18#include <stdio.h>
19
20/* Return true if the stream STREAM is opened read-only, or if the
21   last operation on the stream was a read operation.  Return false if
22   the stream is opened write-only or append-only, or if it supports
23   writing and there is no current read operation (such as fputc).
24
25   freading and fwriting will never both be true.  If STREAM supports
26   both reads and writes, then:
27     - both freading and fwriting might be false when the stream is first
28       opened, after read encounters EOF, or after fflush,
29     - freading might be false or true and fwriting might be false
30       after repositioning (such as fseek, fsetpos, or rewind),
31   depending on the underlying implementation.
32
33   STREAM must not be wide-character oriented.  */
34
35#if HAVE___FREADING && (!defined __GLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
36/* Solaris >= 7, not glibc >= 2.2, but glibc >= 2.7  */
37
38# include <stdio_ext.h>
39# define freading(stream) (__freading (stream) != 0)
40
41#else
42
43# ifdef __cplusplus
44extern "C" {
45# endif
46
47extern bool freading (FILE *stream);
48
49# ifdef __cplusplus
50}
51# endif
52
53#endif
54