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annotate lib/freading.c @ 9981:e3d6988a9347

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Add tentative support for DragonFly BSD.
author Bruno Haible <bruno@clisp.org>
date Sat, 26 Apr 2008 18:58:00 +0200
parents 2c1ba629f5d5
children 5c7a68d31801
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007-2008 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 "freading.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 /* Don't use glibc's __freading function in glibc < 2.7, see
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25 <http://sourceware.org/bugzilla/show_bug.cgi?id=4359> */
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26 #if !(HAVE___FREADING && (!defined __GLIBC__ || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7)))
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27
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28 bool
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29 freading (FILE *fp)
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30 {
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31 /* Most systems provide FILE as a struct and the necessary bitmask in
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32 <stdio.h>, because they need it for implementing getc() and putc() as
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33 fast macros. */
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34 #if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
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35 return ((fp->_flags & _IO_NO_WRITES) != 0
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36 || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
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37 && fp->_IO_read_base != NULL));
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38 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
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39 return (fp_->_flags & __SRD) != 0;
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40 #elif defined __EMX__ /* emx+gcc */
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41 return (fp->_flags & _IOREAD) != 0;
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42 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
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43 return (fp->_flag & _IOREAD) != 0;
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44 #elif defined __UCLIBC__ /* uClibc */
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45 return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0;
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46 #elif defined __QNX__ /* QNX */
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47 return ((fp->_Mode & 0x2 /* _MOPENW */) == 0
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48 || (fp->_Mode & 0x1000 /* _MREAD */) != 0);
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49 #else
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50 #error "Please port gnulib freading.c to your platform!"
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51 #endif
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52 }
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53
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54 #endif