FreeBSD/Linux Kernel Cross Reference
sys/kern/macro_help.h
1 /*
2 * Mach Operating System
3 * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26 /*
27 * HISTORY
28 * $Log: macro_help.h,v $
29 * Revision 2.4 93/01/14 17:35:26 danner
30 * Too many replicas of this file.
31 * [92/12/10 18:07:36 af]
32 *
33 * Revision 2.3 91/05/14 16:44:49 mrt
34 * Correcting copyright
35 *
36 * Revision 2.2 91/02/05 17:28:09 mrt
37 * Changed to new Mach copyright
38 * [91/02/01 16:15:31 mrt]
39 *
40 * Revision 2.1 89/08/03 15:53:45 rwd
41 * Created.
42 *
43 * Revision 2.2 88/10/18 03:36:20 mwyoung
44 * Added a form of return that can be used within macros that
45 * does not result in "statement not reached" noise.
46 * [88/10/17 mwyoung]
47 *
48 * Add MACRO_BEGIN, MACRO_END.
49 * [88/10/11 mwyoung]
50 *
51 * Created.
52 * [88/10/08 mwyoung]
53 *
54 */
55 /*
56 * File: kern/macro_help.h
57 *
58 * Provide help in making lint-free macro routines
59 *
60 */
61
62 #ifndef _KERN_MACRO_HELP_H_
63 #define _KERN_MACRO_HELP_H_
64
65 #if !defined(MACRO_BEGIN)
66
67 #include <mach/boolean.h>
68
69 #ifdef lint
70 boolean_t NEVER;
71 boolean_t ALWAYS;
72 #else /* lint */
73 #define NEVER FALSE
74 #define ALWAYS TRUE
75 #endif /* lint */
76
77 #define MACRO_BEGIN do {
78 #define MACRO_END } while (NEVER)
79
80 #define MACRO_RETURN if (ALWAYS) return
81
82 #endif /* !MACRO_BEGIN */
83
84 #endif /* _KERN_MACRO_HELP_H_ */
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