| t2ex/bsd_source/lib/libc/src_bsd/include/sys/endian.h | bare source | permlink (0.02 seconds) |
1: /* $OpenBSD: endian.h,v 1.19 2011/06/24 22:44:59 deraadt 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: 41: #define _LITTLE_ENDIAN 1234 42: #define _BIG_ENDIAN 4321 43: #define _PDP_ENDIAN 3412 44: 45: #if __BSD_VISIBLE 46: #define LITTLE_ENDIAN _LITTLE_ENDIAN 47: #define BIG_ENDIAN _BIG_ENDIAN 48: #define PDP_ENDIAN _PDP_ENDIAN 49: #define BYTE_ORDER _BYTE_ORDER 50: #endif 51: 52: #ifdef __GNUC__ 53: 54: #define __swap16gen(x) __statement({ \ 55: __uint16_t __swap16gen_x = (x); \ 56: \ 57: (__uint16_t)((__swap16gen_x & 0xff) << 8 | \ 58: (__swap16gen_x & 0xff00) >> 8); \ 59: }) 60: 61: #define __swap32gen(x) __statement({ \ 62: __uint32_t __swap32gen_x = (x); \ 63: \ 64: (__uint32_t)((__swap32gen_x & 0xff) << 24 | \ 65: (__swap32gen_x & 0xff00) << 8 | \ 66: (__swap32gen_x & 0xff0000) >> 8 | \ 67: (__swap32gen_x & 0xff000000) >> 24); \ 68: }) 69: 70: #define __swap64gen(x) __statement({ \ 71: __uint64_t __swap64gen_x = (x); \ 72: \ 73: (__uint64_t)((__swap64gen_x & 0xff) << 56 | \ 74: (__swap64gen_x & 0xff00ULL) << 40 | \ 75: (__swap64gen_x & 0xff0000ULL) << 24 | \ 76: (__swap64gen_x & 0xff000000ULL) << 8 | \ 77: (__swap64gen_x & 0xff00000000ULL) >> 8 | \ 78: (__swap64gen_x & 0xff0000000000ULL) >> 24 | \ 79: (__swap64gen_x & 0xff000000000000ULL) >> 40 | \ 80: (__swap64gen_x & 0xff00000000000000ULL) >> 56); \ 81: }) 82: 83: #else /* __GNUC__ */ 84: 85: /* Note that these macros evaluate their arguments several times. */ 86: #define __swap16gen(x) \ 87: (__uint16_t)(((__uint16_t)(x) & 0xffU) << 8 | ((__uint16_t)(x) & 0xff00U) >> 8) 88: 89: #define __swap32gen(x) \ 90: (__uint32_t)(((__uint32_t)(x) & 0xff) << 24 | \ 91: ((__uint32_t)(x) & 0xff00) << 8 | ((__uint32_t)(x) & 0xff0000) >> 8 |\ 92: ((__uint32_t)(x) & 0xff000000) >> 24) 93: 94: #define __swap64gen(x) \ 95: (__uint64_t)((((__uint64_t)(x) & 0xff) << 56) | \ 96: ((__uint64_t)(x) & 0xff00ULL) << 40 | \ 97: ((__uint64_t)(x) & 0xff0000ULL) << 24 | \ 98: ((__uint64_t)(x) & 0xff000000ULL) << 8 | \ 99: ((__uint64_t)(x) & 0xff00000000ULL) >> 8 | \ 100: ((__uint64_t)(x) & 0xff0000000000ULL) >> 24 | \ 101: ((__uint64_t)(x) & 0xff000000000000ULL) >> 40 | \ 102: ((__uint64_t)(x) & 0xff00000000000000ULL) >> 56) 103: 104: #endif /* __GNUC__ */ 105: 106: /* 107: * Define MD_SWAP if you provide swap{16,32}md functions/macros that are 108: * optimized for your architecture, These will be used for swap{16,32} 109: * unless the argument is a constant and we are using GCC, where we can 110: * take advantage of the CSE phase much better by using the generic version. 111: */ 112: #ifdef MD_SWAP 113: #if __GNUC__ 114: 115: #define __swap16(x) __statement({ \ 116: __uint16_t __swap16_x = (x); \ 117: \ 118: __builtin_constant_p(x) ? __swap16gen(__swap16_x) : \ 119: __swap16md(__swap16_x); \ 120: }) 121: 122: #define __swap32(x) __statement({ \ 123: __uint32_t __swap32_x = (x); \ 124: \ 125: __builtin_constant_p(x) ? __swap32gen(__swap32_x) : \ 126: __swap32md(__swap32_x); \ 127: }) 128: 129: #define __swap64(x) __statement({ \ 130: __uint64_t __swap64_x = (x); \ 131: \ 132: __builtin_constant_p(x) ? __swap64gen(__swap64_x) : \ 133: __swap64md(__swap64_x); \ 134: }) 135: 136: #endif /* __GNUC__ */ 137: 138: #else /* MD_SWAP */ 139: #define __swap16 __swap16gen 140: #define __swap32 __swap32gen 141: #define __swap64 __swap64gen 142: #endif /* MD_SWAP */ 143: 144: #define __swap16_multi(v, n) do { \ 145: __size_t __swap16_multi_n = (n); \ 146: __uint16_t *__swap16_multi_v = (v); \ 147: \ 148: while (__swap16_multi_n) { \ 149: *__swap16_multi_v = swap16(*__swap16_multi_v); \ 150: __swap16_multi_v++; \ 151: __swap16_multi_n--; \ 152: } \ 153: } while (0) 154: 155: #if __BSD_VISIBLE 156: #define swap16 __swap16 157: #define swap32 __swap32 158: #define swap64 __swap64 159: #define swap16_multi __swap16_multi 160: 161: __BEGIN_DECLS 162: __uint64_t htobe64(__uint64_t); 163: __uint32_t htobe32(__uint32_t); 164: __uint16_t htobe16(__uint16_t); 165: __uint64_t betoh64(__uint64_t); 166: __uint32_t betoh32(__uint32_t); 167: __uint16_t betoh16(__uint16_t); 168: 169: __uint64_t htole64(__uint64_t); 170: __uint32_t htole32(__uint32_t); 171: __uint16_t htole16(__uint16_t); 172: __uint64_t letoh64(__uint64_t); 173: __uint32_t letoh32(__uint32_t); 174: __uint16_t letoh16(__uint16_t); 175: __END_DECLS 176: #endif /* __BSD_VISIBLE */ 177: 178: #if _BYTE_ORDER == _LITTLE_ENDIAN 179: 180: /* Can be overridden by machine/endian.h before inclusion of this file. */ 181: #ifndef _QUAD_HIGHWORD 182: #define _QUAD_HIGHWORD 1 183: #endif 184: #ifndef _QUAD_LOWWORD 185: #define _QUAD_LOWWORD 0 186: #endif 187: 188: #if __BSD_VISIBLE 189: #define htobe16 __swap16 190: #define htobe32 __swap32 191: #define htobe64 __swap64 192: #define betoh16 __swap16 193: #define betoh32 __swap32 194: #define betoh64 __swap64 195: 196: #define htole16(x) ((__uint16_t)(x)) 197: #define htole32(x) ((__uint32_t)(x)) 198: #define htole64(x) ((__uint64_t)(x)) 199: #define letoh16(x) ((__uint16_t)(x)) 200: #define letoh32(x) ((__uint32_t)(x)) 201: #define letoh64(x) ((__uint64_t)(x)) 202: #endif /* __BSD_VISIBLE */ 203: 204: #define htons(x) __swap16(x) 205: #define htonl(x) __swap32(x) 206: #define ntohs(x) __swap16(x) 207: #define ntohl(x) __swap32(x) 208: 209: #endif /* _BYTE_ORDER */ 210: 211: #if _BYTE_ORDER == _BIG_ENDIAN 212: 213: /* Can be overridden by machine/endian.h before inclusion of this file. */ 214: #ifndef _QUAD_HIGHWORD 215: #define _QUAD_HIGHWORD 0 216: #endif 217: #ifndef _QUAD_LOWWORD 218: #define _QUAD_LOWWORD 1 219: #endif 220: 221: #if __BSD_VISIBLE 222: #define htole16 __swap16 223: #define htole32 __swap32 224: #define htole64 __swap64 225: #define letoh16 __swap16 226: #define letoh32 __swap32 227: #define letoh64 __swap64 228: 229: #define htobe16(x) ((__uint16_t)(x)) 230: #define htobe32(x) ((__uint32_t)(x)) 231: #define htobe64(x) ((__uint64_t)(x)) 232: #define betoh16(x) ((__uint16_t)(x)) 233: #define betoh32(x) ((__uint32_t)(x)) 234: #define betoh64(x) ((__uint64_t)(x)) 235: #endif /* __BSD_VISIBLE */ 236: 237: #define htons(x) ((__uint16_t)(x)) 238: #define htonl(x) ((__uint32_t)(x)) 239: #define ntohs(x) ((__uint16_t)(x)) 240: #define ntohl(x) ((__uint32_t)(x)) 241: 242: #endif /* _BYTE_ORDER */ 243: 244: #if __BSD_VISIBLE 245: #define NTOHL(x) (x) = ntohl((u_int32_t)(x)) 246: #define NTOHS(x) (x) = ntohs((u_int16_t)(x)) 247: #define HTONL(x) (x) = htonl((u_int32_t)(x)) 248: #define HTONS(x) (x) = htons((u_int16_t)(x)) 249: #endif 250: 251: #endif /* _SYS_ENDIAN_H_ */