Mercurial > gnulib
view lib/fwriting.h @ 37277:1bd4d1c6cbb4
freadable, fwritable, fwriting: declare with the "pure" attribute
* lib/freadable.h (freadable): Declare with the "pure" attribute.
* lib/fwritable.h (fwritable): Likewise.
* lib/fwriting.h (fwriting): Likewise.
Suggested by Bruno Haible.
author | Jim Meyering <meyering@fb.com> |
---|---|
date | Fri, 03 Jan 2014 17:17:27 -0800 |
parents | 5ab07c0bc4df |
children | ab58d4870664 |
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/* Retrieve information about a FILE stream. Copyright (C) 2007, 2009-2014 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://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, musl libc */ # include <stdio_ext.h> # define fwriting(stream) (__fwriting (stream) != 0) #else # ifdef __cplusplus extern "C" { # endif extern bool fwriting (FILE *stream) _GL_ATTRIBUTE_PURE; # ifdef __cplusplus } # endif #endif