/* $OpenBSD: endian.h,v 1.17 2006/01/06 18:53:05 millert Exp $ */ /*- * Copyright (c) 1997 Niklas Hallqvist. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Generic definitions for little- and big-endian systems. Other endianesses * has to be dealt with in the specific machine/endian.h file for that port. * * This file is meant to be included from a little- or big-endian port's * machine/endian.h after setting _BYTE_ORDER to either 1234 for little endian * or 4321 for big.. */ #ifndef _SYS_ENDIAN_H_ #define _SYS_ENDIAN_H_ #include #include #define _LITTLE_ENDIAN 1234 #define _BIG_ENDIAN 4321 #define _PDP_ENDIAN 3412 #if __BSD_VISIBLE #define LITTLE_ENDIAN _LITTLE_ENDIAN #define BIG_ENDIAN _BIG_ENDIAN #define PDP_ENDIAN _PDP_ENDIAN #define BYTE_ORDER _BYTE_ORDER #endif #ifdef __GNUC__ #define __swap16gen(x) __statement({ \ __uint16_t __swap16gen_x = (x); \ \ (__uint16_t)((__swap16gen_x & 0xff) << 8 | \ (__swap16gen_x & 0xff00) >> 8); \ }) #define __swap32gen(x) __statement({ \ __uint32_t __swap32gen_x = (x); \ \ (__uint32_t)((__swap32gen_x & 0xff) << 24 | \ (__swap32gen_x & 0xff00) << 8 | \ (__swap32gen_x & 0xff0000) >> 8 | \ (__swap32gen_x & 0xff000000) >> 24); \ }) #define __swap64gen(x) __statement({ \ __uint64_t __swap64gen_x = (x); \ \ (__uint64_t)((__swap64gen_x & 0xff) << 56 | \ (__swap64gen_x & 0xff00ULL) << 40 | \ (__swap64gen_x & 0xff0000ULL) << 24 | \ (__swap64gen_x & 0xff000000ULL) << 8 | \ (__swap64gen_x & 0xff00000000ULL) >> 8 | \ (__swap64gen_x & 0xff0000000000ULL) >> 24 | \ (__swap64gen_x & 0xff000000000000ULL) >> 40 | \ (__swap64gen_x & 0xff00000000000000ULL) >> 56); \ }) #else /* __GNUC__ */ /* Note that these macros evaluate their arguments several times. */ #define __swap16gen(x) \ (__uint16_t)(((__uint16_t)(x) & 0xff) << 8 | ((__uint16_t)(x) & 0xff00) >> 8) #define __swap32gen(x) \ (__uint32_t)(((__uint32_t)(x) & 0xff) << 24 | \ ((__uint32_t)(x) & 0xff00) << 8 | ((__uint32_t)(x) & 0xff0000) >> 8 |\ ((__uint32_t)(x) & 0xff000000) >> 24) #define __swap64gen(x) \ (__uint64_t)((((__uint64_t)(x) & 0xff) << 56) | \ ((__uint64_t)(x) & 0xff00ULL) << 40 | \ ((__uint64_t)(x) & 0xff0000ULL) << 24 | \ ((__uint64_t)(x) & 0xff000000ULL) << 8 | \ ((__uint64_t)(x) & 0xff00000000ULL) >> 8 | \ ((__uint64_t)(x) & 0xff0000000000ULL) >> 24 | \ ((__uint64_t)(x) & 0xff000000000000ULL) >> 40 | \ ((__uint64_t)(x) & 0xff00000000000000ULL) >> 56) #endif /* __GNUC__ */ /* * Define MD_SWAP if you provide swap{16,32}md functions/macros that are * optimized for your architecture, These will be used for swap{16,32} * unless the argument is a constant and we are using GCC, where we can * take advantage of the CSE phase much better by using the generic version. */ #ifdef MD_SWAP #if __GNUC__ #define __swap16(x) __statement({ \ __uint16_t __swap16_x = (x); \ \ __builtin_constant_p(x) ? __swap16gen(__swap16_x) : \ __swap16md(__swap16_x); \ }) #define __swap32(x) __statement({ \ __uint32_t __swap32_x = (x); \ \ __builtin_constant_p(x) ? __swap32gen(__swap32_x) : \ __swap32md(__swap32_x); \ }) #define __swap64(x) __statement({ \ __uint64_t __swap64_x = (x); \ \ __builtin_constant_p(x) ? __swap64gen(__swap64_x) : \ __swap64md(__swap64_x); \ }) #endif /* __GNUC__ */ #else /* MD_SWAP */ #define __swap16 __swap16gen #define __swap32 __swap32gen #define __swap64 __swap64gen #endif /* MD_SWAP */ #define __swap16_multi(v, n) do { \ __size_t __swap16_multi_n = (n); \ __uint16_t *__swap16_multi_v = (v); \ \ while (__swap16_multi_n) { \ *__swap16_multi_v = swap16(*__swap16_multi_v); \ __swap16_multi_v++; \ __swap16_multi_n--; \ } \ } while (0) #if __BSD_VISIBLE #define swap16 __swap16 #define swap32 __swap32 #define swap64 __swap64 #define swap16_multi __swap16_multi #endif /* __BSD_VISIBLE */ #if _BYTE_ORDER == _LITTLE_ENDIAN /* Can be overridden by machine/endian.h before inclusion of this file. */ #ifndef _QUAD_HIGHWORD #define _QUAD_HIGHWORD 1 #endif #ifndef _QUAD_LOWWORD #define _QUAD_LOWWORD 0 #endif #if __BSD_VISIBLE #define htobe16 __swap16 #define htobe32 __swap32 #define htobe64 __swap64 #define betoh16 __swap16 #define betoh32 __swap32 #define betoh64 __swap64 #define htole16(x) (x) #define htole32(x) (x) #define htole64(x) (x) #define letoh16(x) (x) #define letoh32(x) (x) #define letoh64(x) (x) #endif /* __BSD_VISIBLE */ /* glibc compatibility. */ __BEGIN_DECLS uint32_t htonl(uint32_t) __pure2; uint16_t htons(uint16_t) __pure2; uint32_t ntohl(uint32_t) __pure2; uint16_t ntohs(uint16_t) __pure2; __END_DECLS #define htonl(x) __swap32(x) #define htons(x) __swap16(x) #define ntohl(x) __swap32(x) #define ntohs(x) __swap16(x) /* Bionic additions */ #define htonq(x) __swap64(x) #define ntohq(x) __swap64(x) #define __LITTLE_ENDIAN_BITFIELD #endif /* _BYTE_ORDER */ #if _BYTE_ORDER == _BIG_ENDIAN /* Can be overridden by machine/endian.h before inclusion of this file. */ #ifndef _QUAD_HIGHWORD #define _QUAD_HIGHWORD 0 #endif #ifndef _QUAD_LOWWORD #define _QUAD_LOWWORD 1 #endif #if __BSD_VISIBLE #define htole16 __swap16 #define htole32 __swap32 #define htole64 __swap64 #define letoh16 __swap16 #define letoh32 __swap32 #define letoh64 __swap64 #define htobe16(x) (x) #define htobe32(x) (x) #define htobe64(x) (x) #define betoh16(x) (x) #define betoh32(x) (x) #define betoh64(x) (x) #endif /* __BSD_VISIBLE */ #define htons(x) (x) #define htonl(x) (x) #define ntohs(x) (x) #define ntohl(x) (x) /* Bionic additions */ #define ntohq(x) (x) #define htonq(x) (x) #define __BIG_ENDIAN_BITFIELD #endif /* _BYTE_ORDER */ #if __BSD_VISIBLE #define NTOHL(x) (x) = ntohl((u_int32_t)(x)) #define NTOHS(x) (x) = ntohs((u_int16_t)(x)) #define HTONL(x) (x) = htonl((u_int32_t)(x)) #define HTONS(x) (x) = htons((u_int16_t)(x)) #endif #define __BYTE_ORDER _BYTE_ORDER #ifndef __LITTLE_ENDIAN #define __LITTLE_ENDIAN _LITTLE_ENDIAN #endif #ifndef __BIG_ENDIAN #define __BIG_ENDIAN _BIG_ENDIAN #endif #ifdef __BSD_VISIBLE /* * glibc-compatible beXXtoh/leXXtoh synonyms for htobeXX/htoleXX. * The BSDs export both sets of names, bionic historically only * exported the ones above (or on the rhs here), and glibc only * exports these names (on the lhs). */ #define be16toh(x) htobe16(x) #define be32toh(x) htobe32(x) #define be64toh(x) htobe64(x) #define le16toh(x) htole16(x) #define le32toh(x) htole32(x) #define le64toh(x) htole64(x) #endif #endif /* _SYS_ENDIAN_H_ */