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/* Retrieve information about a FILE stream.
Copyright (C) 2007, 2009-2021 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/>. */
#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, 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
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