blob: 6af4761e22b2e03d36f0b376c9b47746240678c3
| 1 | /* |
| 2 | * support.h - Useful definitions and macros. Originated from the Linux-NTFS project. |
| 3 | * |
| 4 | * Copyright (c) 2000-2004 Anton Altaparmakov |
| 5 | * |
| 6 | * This program/include file is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as published |
| 8 | * by the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program/include file is distributed in the hope that it will be |
| 12 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| 13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program (in the main directory of the NTFS-3G |
| 18 | * distribution in the file COPYING); if not, write to the Free Software |
| 19 | * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #ifndef _NTFS_SUPPORT_H |
| 23 | #define _NTFS_SUPPORT_H |
| 24 | |
| 25 | #ifdef HAVE_CONFIG_H |
| 26 | #include "config.h" |
| 27 | #endif |
| 28 | |
| 29 | #ifdef HAVE_STDDEF_H |
| 30 | #include <stddef.h> |
| 31 | #endif |
| 32 | |
| 33 | /* |
| 34 | * Our mailing list. Use this define to prevent typos in email address. |
| 35 | */ |
| 36 | #define NTFS_DEV_LIST "ntfs-3g-devel@lists.sf.net" |
| 37 | |
| 38 | /* |
| 39 | * Generic macro to convert pointers to values for comparison purposes. |
| 40 | */ |
| 41 | #ifndef p2n |
| 42 | #define p2n(p) ((ptrdiff_t)((ptrdiff_t*)(p))) |
| 43 | #endif |
| 44 | |
| 45 | /* |
| 46 | * The classic min and max macros. |
| 47 | */ |
| 48 | #ifndef min |
| 49 | #define min(a,b) ((a) <= (b) ? (a) : (b)) |
| 50 | #endif |
| 51 | |
| 52 | #ifndef max |
| 53 | #define max(a,b) ((a) >= (b) ? (a) : (b)) |
| 54 | #endif |
| 55 | |
| 56 | /* |
| 57 | * Useful macro for determining the offset of a struct member. |
| 58 | */ |
| 59 | #ifndef offsetof |
| 60 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
| 61 | #endif |
| 62 | |
| 63 | /* |
| 64 | * Simple bit operation macros. NOTE: These are NOT atomic. |
| 65 | */ |
| 66 | #define test_bit(bit, var) ((var) & (1 << (bit))) |
| 67 | #define set_bit(bit, var) (var) |= 1 << (bit) |
| 68 | #define clear_bit(bit, var) (var) &= ~(1 << (bit)) |
| 69 | |
| 70 | #define test_and_set_bit(bit, var) \ |
| 71 | ({ \ |
| 72 | const BOOL old_state = test_bit(bit, var); \ |
| 73 | set_bit(bit, var); \ |
| 74 | old_state; \ |
| 75 | }) |
| 76 | |
| 77 | #define test_and_clear_bit(bit, var) \ |
| 78 | ({ \ |
| 79 | const BOOL old_state = test_bit(bit, var); \ |
| 80 | clear_bit(bit, var); \ |
| 81 | old_state; \ |
| 82 | }) |
| 83 | |
| 84 | #endif /* defined _NTFS_SUPPORT_H */ |
| 85 | |
| 86 |