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annotate lib/freading.c @ 8752:3d1951b8600f

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Trivial simplification.
author Bruno Haible <bruno@clisp.org>
date Sun, 29 Apr 2007 08:24:53 +0000
parents 367787d55c9c
children 1d4c80b053f0
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007 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 2, or (at your option)
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7 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 along
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15 with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 #include <config.h>
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19
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20 /* Specification. */
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21 #include "freading.h"
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22
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23 /* Don't use glibc's __freading function, see
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24 <http://sourceware.org/bugzilla/show_bug.cgi?id=4359> */
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25 #if !(HAVE___FREADING && !defined __GLIBC__)
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26
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27 bool
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28 freading (FILE *fp)
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29 {
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30 /* Most systems provide FILE as a struct and the necessary bitmask in
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31 <stdio.h>, because they need it for implementing getc() and putc() as
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32 fast macros. */
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33 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
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34 return ((fp->_flags & _IO_NO_WRITES) != 0
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35 || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
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36 && fp->_IO_read_base != NULL));
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37 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
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38 return (fp->_flags & __SRD) != 0;
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39 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
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40 return (fp->_flag & _IOREAD) != 0;
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41 #else
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42 #error "Please port gnulib freading.c to your platform!"
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43 #endif
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44 }
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45
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46 #endif