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annotate lib/fwriting.h @ 17249:e542fd46ad6f

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maint: update all copyright year number ranges Run "make update-copyright". Compare to commit 1602f0a from last year. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 01 Jan 2013 00:50:58 +0000
parents 3d02d25fa13d
children
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007, 2009-2013 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <stdbool.h>
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18 #include <stdio.h>
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19
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20 /* Return true if the stream STREAM is opened write-only or
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21 append-only, or if the last operation on the stream was a write
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22 operation. Return false if the stream is opened read-only, or if
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23 it supports reading and there is no current write operation (such
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24 as fputc).
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25
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26 freading and fwriting will never both be true. If STREAM supports
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27 both reads and writes, then:
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28 - both freading and fwriting might be false when the stream is first
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29 opened, after read encounters EOF, or after fflush,
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30 - freading might be false or true and fwriting might be false
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31 after repositioning (such as fseek, fsetpos, or rewind),
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32 depending on the underlying implementation.
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33
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34 STREAM must not be wide-character oriented. */
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35
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36 #if HAVE___FWRITING /* glibc >= 2.2, Solaris >= 7, musl libc */
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37
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38 # include <stdio_ext.h>
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39 # define fwriting(stream) (__fwriting (stream) != 0)
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40
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41 #else
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42
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43 # ifdef __cplusplus
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44 extern "C" {
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45 # endif
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46
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47 extern bool fwriting (FILE *stream);
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48
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49 # ifdef __cplusplus
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50 }
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51 # endif
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52
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53 #endif