1 /*
2 * support.h - Various useful things. Part of the Linux-NTFS project.
3 *
4 * Copyright (c) 2000-2004 Anton Altaparmakov
5 * Copyright (c) 2006 Szabolcs Szakacsits
6 * Copyright (c) 2006 Yura Pakhuchiy
7 *
8 * This program/include file is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published
10 * by the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program/include file is distributed in the hope that it will be
14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program (in the main directory of the Linux-NTFS
20 * distribution in the file COPYING); if not, write to the Free Software
21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #ifndef _NTFS_SUPPORT_H
25 #define _NTFS_SUPPORT_H
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #ifdef HAVE_STDDEF_H
32 #include <stddef.h>
33 #endif
34
35 #ifdef HAVE_STDLIB_H
36 #include <stdlib.h>
37 #endif
38
39 #include "logging.h"
40
41 /*
42 * Our mailing list. Use this define to prevent typos in email address.
43 */
44 #define NTFS_DEV_LIST "linux-ntfs-dev@lists.sf.net"
45
46 /*
47 * Generic macro to convert pointers to values for comparison purposes.
48 */
49 #ifndef p2n
50 #define p2n(p) ((ptrdiff_t)((ptrdiff_t*)(p)))
51 #endif
52
53 /*
54 * The classic min and max macros.
55 */
56 #ifndef min
57 #define min(a,b) ((a) <= (b) ? (a) : (b))
58 #endif
59
60 #ifndef max
61 #define max(a,b) ((a) >= (b) ? (a) : (b))
62 #endif
63
64 /*
65 * Useful macro for determining the offset of a struct member.
66 */
67 #ifndef offsetof
68 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
69 #endif
70
71 /*
72 * Round up and down @num to 2 in power of @order.
73 */
74 #define ROUND_UP(num,order) (((num) + ((1 << (order)) - 1)) & \
75 ~((1 << (order)) - 1))
76 #define ROUND_DOWN(num,order) ((num) & ~((1 << (order)) - 1))
77
78 /*
79 * Simple bit operation macros. NOTE: These are NOT atomic.
80 */
81 #define test_bit(bit, var) ((var) & (1 << (bit)))
82 #define set_bit(bit, var) (var) |= 1 << (bit)
83 #define clear_bit(bit, var) (var) &= ~(1 << (bit))
84
85 #ifdef __sun
86 #define test_and_set_bit(bit, var) _test_and_set_bit(bit, &var)
_test_and_set_bit(unsigned long bit,unsigned long * var)87 static __inline__ BOOL _test_and_set_bit(unsigned long bit, unsigned long *var)
88 {
89 const BOOL old_state = test_bit(bit, *var);
90 set_bit(bit, *var);
91 return old_state;
92 }
93
94 #define test_and_clear_bit(bit, var) _test_and_clear_bit(bit, &var)
_test_and_clear_bit(unsigned long bit,unsigned long * var)95 static __inline__ BOOL _test_and_clear_bit(unsigned long bit, unsigned long *var)
96 {
97 const BOOL old_state = test_bit(bit, *var);
98 clear_bit(bit, *var);
99 return old_state;
100 }
101 #else /* !__sun */
102 #define test_and_set_bit(bit, var) \
103 ({ \
104 const BOOL old_state = test_bit(bit, var); \
105 set_bit(bit, var); \
106 old_state; \
107 })
108
109 #define test_and_clear_bit(bit, var) \
110 ({ \
111 const BOOL old_state = test_bit(bit, var); \
112 clear_bit(bit, var); \
113 old_state; \
114 })
115 #endif /* __sun */
116
117 /* Memory allocation with logging. */
118 extern void *ntfs_calloc(size_t size);
119 extern void *ntfs_malloc(size_t size);
120
121 #endif /* defined _NTFS_SUPPORT_H */
122