54 lines
2 KiB
C
54 lines
2 KiB
C
/* Retrieve information about a FILE stream.
|
|
Copyright (C) 2007-2023 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 2.1 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 <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 is opened write-only or append-only, or if it supports
|
|
writing and there is no current read operation (such as fgetc).
|
|
|
|
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___FREADING && (!defined __GLIBC__ || defined __UCLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
|
|
/* 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 */
|
|
|
|
# if HAVE_STDIO_EXT_H
|
|
# include <stdio_ext.h>
|
|
# endif
|
|
# define freading(stream) (__freading (stream) != 0)
|
|
|
|
#else
|
|
|
|
# ifdef __cplusplus
|
|
extern "C" {
|
|
# endif
|
|
|
|
extern bool freading (FILE *stream) _GL_ATTRIBUTE_PURE;
|
|
|
|
# ifdef __cplusplus
|
|
}
|
|
# endif
|
|
|
|
#endif
|