ndk/android-ndk-r4/darwin/platforms/android-4/arch-arm/usr/include/sys/endian.h

   1 /*      $OpenBSD: endian.h,v 1.17 2006/01/06 18:53:05 millert Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * Generic definitions for little- and big-endian systems.  Other endianesses
  29  * has to be dealt with in the specific machine/endian.h file for that port.
  30  *
  31  * This file is meant to be included from a little- or big-endian port's
  32  * machine/endian.h after setting _BYTE_ORDER to either 1234 for little endian
  33  * or 4321 for big..
  34  */
  35
  36 #ifndef _SYS_ENDIAN_H_
  37 #define _SYS_ENDIAN_H_
  38
  39 #include <sys/cdefs.h>
  40 #include <machine/_types.h>
  41
  42 #define _LITTLE_ENDIAN  1234
  43 #define _BIG_ENDIAN     4321
  44 #define _PDP_ENDIAN     3412
  45
  46 #if __BSD_VISIBLE
  47 #define LITTLE_ENDIAN   _LITTLE_ENDIAN
  48 #define BIG_ENDIAN      _BIG_ENDIAN
  49 #define PDP_ENDIAN      _PDP_ENDIAN
  50 #define BYTE_ORDER      _BYTE_ORDER
  51 #endif
  52
  53 #ifdef __GNUC__
  54
  55 #define __swap16gen(x) __statement({                                    \
  56         __uint16_t __swap16gen_x = (x);                                 \
  57                                                                         \
  58         (__uint16_t)((__swap16gen_x & 0xff) << 8 |                      \
  59             (__swap16gen_x & 0xff00) >> 8);                             \
  60 })
  61
  62 #define __swap32gen(x) __statement({                                    \
  63         __uint32_t __swap32gen_x = (x);                                 \
  64                                                                         \
  65         (__uint32_t)((__swap32gen_x & 0xff) << 24 |                     \
  66             (__swap32gen_x & 0xff00) << 8 |                             \
  67             (__swap32gen_x & 0xff0000) >> 8 |                           \
  68             (__swap32gen_x & 0xff000000) >> 24);                        \
  69 })
  70
  71 #define __swap64gen(x) __statement({                                    \
  72         __uint64_t __swap64gen_x = (x);                                 \
  73                                                                         \
  74         (__uint64_t)((__swap64gen_x & 0xff) << 56 |                     \
  75             (__swap64gen_x & 0xff00ULL) << 40 |                         \
  76             (__swap64gen_x & 0xff0000ULL) << 24 |                       \
  77             (__swap64gen_x & 0xff000000ULL) << 8 |                      \
  78             (__swap64gen_x & 0xff00000000ULL) >> 8 |                    \
  79             (__swap64gen_x & 0xff0000000000ULL) >> 24 |                 \
  80             (__swap64gen_x & 0xff000000000000ULL) >> 40 |               \
  81             (__swap64gen_x & 0xff00000000000000ULL) >> 56);             \
  82 })
  83
  84 #else /* __GNUC__ */
  85
  86 /* Note that these macros evaluate their arguments several times.  */
  87 #define __swap16gen(x)                                                  \
  88     (__uint16_t)(((__uint16_t)(x) & 0xff) << 8 | ((__uint16_t)(x) & 0xff00) >> 8)
  89
  90 #define __swap32gen(x)                                                  \
  91     (__uint32_t)(((__uint32_t)(x) & 0xff) << 24 |                       \
  92     ((__uint32_t)(x) & 0xff00) << 8 | ((__uint32_t)(x) & 0xff0000) >> 8 |\
  93     ((__uint32_t)(x) & 0xff000000) >> 24)
  94
  95 #define __swap64gen(x)                                                  \
  96         (__uint64_t)((((__uint64_t)(x) & 0xff) << 56) |                 \
  97             ((__uint64_t)(x) & 0xff00ULL) << 40 |                       \
  98             ((__uint64_t)(x) & 0xff0000ULL) << 24 |                     \
  99             ((__uint64_t)(x) & 0xff000000ULL) << 8 |                    \
 100             ((__uint64_t)(x) & 0xff00000000ULL) >> 8 |                  \
 101             ((__uint64_t)(x) & 0xff0000000000ULL) >> 24 |               \
 102             ((__uint64_t)(x) & 0xff000000000000ULL) >> 40 |             \
 103             ((__uint64_t)(x) & 0xff00000000000000ULL) >> 56)
 104
 105 #endif /* __GNUC__ */
 106
 107 /*
 108  * Define MD_SWAP if you provide swap{16,32}md functions/macros that are
 109  * optimized for your architecture,  These will be used for swap{16,32}
 110  * unless the argument is a constant and we are using GCC, where we can
 111  * take advantage of the CSE phase much better by using the generic version.
 112  */
 113 #ifdef MD_SWAP
 114 #if __GNUC__
 115
 116 #define __swap16(x) __statement({                                       \
 117         __uint16_t __swap16_x = (x);                                    \
 118                                                                         \
 119         __builtin_constant_p(x) ? __swap16gen(__swap16_x) :             \
 120             __swap16md(__swap16_x);                                     \
 121 })
 122
 123 #define __swap32(x) __statement({                                       \
 124         __uint32_t __swap32_x = (x);                                    \
 125                                                                         \
 126         __builtin_constant_p(x) ? __swap32gen(__swap32_x) :             \
 127             __swap32md(__swap32_x);                                     \
 128 })
 129
 130 #define __swap64(x) __statement({                                       \
 131         __uint64_t __swap64_x = (x);                                    \
 132                                                                         \
 133         __builtin_constant_p(x) ? __swap64gen(__swap64_x) :             \
 134             __swap64md(__swap64_x);                                     \
 135 })
 136
 137 #endif /* __GNUC__  */
 138
 139 #else /* MD_SWAP */
 140 #define __swap16 __swap16gen
 141 #define __swap32 __swap32gen
 142 #define __swap64 __swap64gen
 143 #endif /* MD_SWAP */
 144
 145 #define __swap16_multi(v, n) do {                                               \
 146         __size_t __swap16_multi_n = (n);                                \
 147         __uint16_t *__swap16_multi_v = (v);                             \
 148                                                                         \
 149         while (__swap16_multi_n) {                                      \
 150                 *__swap16_multi_v = swap16(*__swap16_multi_v);          \
 151                 __swap16_multi_v++;                                     \
 152                 __swap16_multi_n--;                                     \
 153         }                                                               \
 154 } while (0)
 155
 156 #if __BSD_VISIBLE
 157 #define swap16 __swap16
 158 #define swap32 __swap32
 159 #define swap64 __swap64
 160 #define swap16_multi __swap16_multi
 161
 162 __BEGIN_DECLS
 163 __uint64_t      htobe64(__uint64_t);
 164 __uint32_t      htobe32(__uint32_t);
 165 __uint16_t      htobe16(__uint16_t);
 166 __uint64_t      betoh64(__uint64_t);
 167 __uint32_t      betoh32(__uint32_t);
 168 __uint16_t      betoh16(__uint16_t);
 169
 170 __uint64_t      htole64(__uint64_t);
 171 __uint32_t      htole32(__uint32_t);
 172 __uint16_t      htole16(__uint16_t);
 173 __uint64_t      letoh64(__uint64_t);
 174 __uint32_t      letoh32(__uint32_t);
 175 __uint16_t      letoh16(__uint16_t);
 176 __END_DECLS
 177 #endif /* __BSD_VISIBLE */
 178
 179 #if _BYTE_ORDER == _LITTLE_ENDIAN
 180
 181 /* Can be overridden by machine/endian.h before inclusion of this file.  */
 182 #ifndef _QUAD_HIGHWORD
 183 #define _QUAD_HIGHWORD 1
 184 #endif
 185 #ifndef _QUAD_LOWWORD
 186 #define _QUAD_LOWWORD 0
 187 #endif
 188
 189 #if __BSD_VISIBLE
 190 #define htobe16 __swap16
 191 #define htobe32 __swap32
 192 #define htobe64 __swap64
 193 #define betoh16 __swap16
 194 #define betoh32 __swap32
 195 #define betoh64 __swap64
 196
 197 #define htole16(x) (x)
 198 #define htole32(x) (x)
 199 #define htole64(x) (x)
 200 #define letoh16(x) (x)
 201 #define letoh32(x) (x)
 202 #define letoh64(x) (x)
 203 #endif /* __BSD_VISIBLE */
 204
 205 #define htons(x) __swap16(x)
 206 #define htonl(x) __swap32(x)
 207 #define ntohs(x) __swap16(x)
 208 #define ntohl(x) __swap32(x)
 209
 210 /* Bionic additions */
 211 #define ntohq(x) __swap64(x)
 212 #define htonq(x) __swap64(x)
 213
 214 #define __LITTLE_ENDIAN_BITFIELD
 215
 216 #endif /* _BYTE_ORDER */
 217
 218 #if _BYTE_ORDER == _BIG_ENDIAN
 219
 220 /* Can be overridden by machine/endian.h before inclusion of this file.  */
 221 #ifndef _QUAD_HIGHWORD
 222 #define _QUAD_HIGHWORD 0
 223 #endif
 224 #ifndef _QUAD_LOWWORD
 225 #define _QUAD_LOWWORD 1
 226 #endif
 227
 228 #if __BSD_VISIBLE
 229 #define htole16 __swap16
 230 #define htole32 __swap32
 231 #define htole64 __swap64
 232 #define letoh16 __swap16
 233 #define letoh32 __swap32
 234 #define letoh64 __swap64
 235
 236 #define htobe16(x) (x)
 237 #define htobe32(x) (x)
 238 #define htobe64(x) (x)
 239 #define betoh16(x) (x)
 240 #define betoh32(x) (x)
 241 #define betoh64(x) (x)
 242 #endif /* __BSD_VISIBLE */
 243
 244 #define htons(x) (x)
 245 #define htonl(x) (x)
 246 #define ntohs(x) (x)
 247 #define ntohl(x) (x)
 248
 249 /* Bionic additions */
 250 #define ntohq(x) (x)
 251 #define htonq(x) (x)
 252
 253 #define __BIG_ENDIAN_BITFIELD
 254
 255 #endif /* _BYTE_ORDER */
 256
 257 #if __BSD_VISIBLE
 258 #define NTOHL(x) (x) = ntohl((u_int32_t)(x))
 259 #define NTOHS(x) (x) = ntohs((u_int16_t)(x))
 260 #define HTONL(x) (x) = htonl((u_int32_t)(x))
 261 #define HTONS(x) (x) = htons((u_int16_t)(x))
 262 #endif
 263
 264
 265 #define  __BYTE_ORDER       _BYTE_ORDER
 266 #ifndef  __LITTLE_ENDIAN
 267 #define  __LITTLE_ENDIAN    _LITTLE_ENDIAN
 268 #endif
 269 #ifndef  __BIG_ENDIAN
 270 #define  __BIG_ENDIAN       _BIG_ENDIAN
 271 #endif
 272
 273 #endif /* _SYS_ENDIAN_H_ */