Mercurial > hg > octave-kai > gnulib-hg

annotate lib/fwritable.c @ 11527:4fe203c3f828

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Replace wcrtomb, wcsrtombs, wcsnrtombs if mbstate_t has to be replaced.
author Bruno Haible <bruno@clisp.org>
date Fri, 01 May 2009 18:01:52 +0200
parents d4475bf2a2bf
children c2cbabec01dd
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007-2009 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 <config.h>
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18
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19 /* Specification. */
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20 #include "fwritable.h"
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21
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22 #include "stdio-impl.h"
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23
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24 bool
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25 fwritable (FILE *fp)
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26 {
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27 /* Most systems provide FILE as a struct and the necessary bitmask in
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28 <stdio.h>, because they need it for implementing getc() and putc() as
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29 fast macros. */
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30 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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31 return (fp->_flags & _IO_NO_WRITES) == 0;
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32 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
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33 return (fp_->_flags & (__SRW | __SWR)) != 0;
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34 #elif defined __EMX__ /* emx+gcc */
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35 return (fp->_flags & (_IORW | _IOWRT)) != 0;
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36 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
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37 return (fp->_flag & (_IORW | _IOWRT)) != 0;
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38 #elif defined __QNX__ /* QNX */
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39 return (fp->_Mode & 0x2 /* _MOPENW */) != 0;
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40 #elif defined __MINT__ /* Atari FreeMiNT */
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41 return fp->__mode.__write;
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42 #else
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43 #error "Please port gnulib fwritable.c to your platform! Look at the definition of fopen, fdopen on your system, then report this to bug-gnulib."
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44 #endif
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45 }