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1/* Retrieve information about a FILE stream.
2 Copyright (C) 2007-2023 Free Software Foundation, Inc.
3
4 This file is free software: you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
8
9 This file 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 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17#include <stdio.h>
18
19/* Return true if the stream STREAM is opened read-only, or if the
20 last operation on the stream was a read operation. Return false if
21 the stream is opened write-only or append-only, or if it supports
22 writing and there is no current read operation (such as fgetc).
23
24 freading and fwriting will never both be true. If STREAM supports
25 both reads and writes, then:
26 - both freading and fwriting might be false when the stream is first
27 opened, after read encounters EOF, or after fflush,
28 - freading might be false or true and fwriting might be false
29 after repositioning (such as fseek, fsetpos, or rewind),
30 depending on the underlying implementation.
31
32 STREAM must not be wide-character oriented. */
33
34#if HAVE___FREADING && (!defined __GLIBC__ || defined __UCLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
35/* Solaris >= 7, UnixWare >= 7.1.4.MP4, Cygwin >= 1.7.34, Android API >= 29, not glibc >= 2.2, but glibc >= 2.7, or musl libc */
36
37# if HAVE_STDIO_EXT_H
38# include <stdio_ext.h>
39# endif
40# define freading(stream) (__freading (stream) != 0)
41
42#else
43
44# ifdef __cplusplus
45extern "C" {
46# endif
47
48extern bool freading (FILE *stream) _GL_ATTRIBUTE_PURE;
49
50# ifdef __cplusplus
51}
52# endif
53
54#endif