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annotate lib/byteswap.in.h @ 17409:26a04e61f560

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stdio: use __REDIRECT for fwrite, fwrite_unlocked * lib/stdio.in.h (fwrite): When working around bug 11959, use __REDIRECT rather than '#define fwrite(...) ... fwrite (...) ...'. This is a more-targeted way to fix the -Wunused-value issue with clang, and it works with GCC too. Problem with targeting reported by Eric Blake in <http://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00067.html>. (fwrite_unlocked): Treat like fwrite. I ran into this issue while debugging the fwrite issue.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 15 May 2013 15:52:42 -0700
parents e542fd46ad6f
children
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1 /* byteswap.h - Byte swapping
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2 Copyright (C) 2005, 2007, 2009-2013 Free Software Foundation, Inc.
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3 Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 #ifndef _GL_BYTESWAP_H
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19 #define _GL_BYTESWAP_H
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21 /* Given an unsigned 16-bit argument X, return the value corresponding to
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22 X with reversed byte order. */
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23 #define bswap_16(x) ((((x) & 0x00FF) << 8) | \
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24 (((x) & 0xFF00) >> 8))
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26 /* Given an unsigned 32-bit argument X, return the value corresponding to
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27 X with reversed byte order. */
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28 #define bswap_32(x) ((((x) & 0x000000FF) << 24) | \
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29 (((x) & 0x0000FF00) << 8) | \
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30 (((x) & 0x00FF0000) >> 8) | \
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31 (((x) & 0xFF000000) >> 24))
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33 /* Given an unsigned 64-bit argument X, return the value corresponding to
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34 X with reversed byte order. */
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35 #define bswap_64(x) ((((x) & 0x00000000000000FFULL) << 56) | \
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36 (((x) & 0x000000000000FF00ULL) << 40) | \
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37 (((x) & 0x0000000000FF0000ULL) << 24) | \
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38 (((x) & 0x00000000FF000000ULL) << 8) | \
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39 (((x) & 0x000000FF00000000ULL) >> 8) | \
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40 (((x) & 0x0000FF0000000000ULL) >> 24) | \
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41 (((x) & 0x00FF000000000000ULL) >> 40) | \
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42 (((x) & 0xFF00000000000000ULL) >> 56))
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43
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44 #endif /* _GL_BYTESWAP_H */