1 /* libc/sys/linux/sys/cdefs.h - Helper macros for K&R vs. ANSI C compat. */ 2 3 /* Written 2000 by Werner Almesberger */ 4 5 /*- 6 * Copyright (c) 1991, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Berkeley Software Design, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 37 * $FreeBSD$ 38 */ 39 40 #ifndef _SYS_DEFS_H_ 41 #define _SYS_DEFS_H_ 42 43 #include "types.h" 44 #include "compiler.h" 45 46 #ifndef __DEQUALIFY 47 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var)) 48 #endif 49 50 #ifndef offsetof 51 #define offsetof(type, field) \ 52 ((size_t)(uintptr_t)((const volatile void *)&((type *)0)->field)) 53 #endif 54 55 #ifndef __offsetof 56 #define __offsetof(type, field) offsetof(type, field) 57 #endif 58 59 #ifndef __containerof 60 #define __containerof(ptr, type, field) \ 61 __DEQUALIFY(type *, (const volatile char *)(ptr) - offsetof(type, field)) 62 #endif 63 64 #ifndef container_of 65 #define container_of(ptr, type, field) __containerof(ptr, type, field) 66 #endif 67 68 69 /* 70 * Definitions for byte order, according to byte significance from low 71 * address to high. 72 */ 73 #ifndef _LITTLE_ENDIAN 74 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 75 #endif 76 #ifndef _BIG_ENDIAN 77 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 78 #endif 79 80 #ifndef LITTLE_ENDIAN 81 #define LITTLE_ENDIAN _LITTLE_ENDIAN 82 #endif 83 #ifndef BIG_ENDIAN 84 #define BIG_ENDIAN _BIG_ENDIAN 85 #endif 86 87 #ifndef _BYTE_ORDER 88 #define _BYTE_ORDER _LITTLE_ENDIAN 89 #endif 90 #ifndef BYTE_ORDER 91 #define BYTE_ORDER _BYTE_ORDER 92 #endif 93 94 #endif /* _SYS_DEFS_H_ */ 95