root / lab4 / .minix-src / include / struct.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: struct.h,v 1.5 2003/08/07 09:44:11 agc Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 1983, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | *
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| 31 | * @(#)struct.h 8.1 (Berkeley) 6/2/93
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| 32 | */
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| 33 | |||
| 34 | #ifndef _STRUCT_H_
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| 35 | #define _STRUCT_H_
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| 36 | |||
| 37 | /* Offset of the field in the structure. */
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| 38 | #define fldoff(name, field) \
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| 39 | ((int)&(((struct name *)0)->field)) |
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| 40 | |||
| 41 | /* Size of the field in the structure. */
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| 42 | #define fldsiz(name, field) \
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| 43 | (sizeof(((struct name *)0)->field)) |
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| 44 | |||
| 45 | /* Address of the structure from a field. */
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| 46 | #define strbase(name, addr, field) \
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| 47 | ((struct name *)((char *)(addr) - fldoff(name, field))) |
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| 48 | |||
| 49 | #endif /* !_STRUCT_H_ */ |