Eric Anholt | f7a9940 | 2008-08-08 15:55:34 -0700 | [diff] [blame] | 1 | /************************************************************************** |
| 2 | * |
| 3 | * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND. USA. |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the |
| 8 | * "Software"), to deal in the Software without restriction, including |
| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
| 11 | * permit persons to whom the Software is furnished to do so, subject to |
| 12 | * the following conditions: |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| 17 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
| 18 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| 19 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| 20 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | * |
| 22 | * The above copyright notice and this permission notice (including the |
| 23 | * next paragraph) shall be included in all copies or substantial portions |
| 24 | * of the Software. |
| 25 | */ |
| 26 | |
| 27 | /* |
| 28 | * List macros heavily inspired by the Linux kernel |
| 29 | * list handling. No list looping yet. |
| 30 | */ |
| 31 | |
Eric Anholt | 72abe98 | 2009-02-18 13:06:35 -0800 | [diff] [blame] | 32 | #include <stddef.h> |
| 33 | |
Eric Anholt | f7a9940 | 2008-08-08 15:55:34 -0700 | [diff] [blame] | 34 | typedef struct _drmMMListHead |
| 35 | { |
| 36 | struct _drmMMListHead *prev; |
| 37 | struct _drmMMListHead *next; |
| 38 | } drmMMListHead; |
| 39 | |
| 40 | #define DRMINITLISTHEAD(__item) \ |
| 41 | do{ \ |
| 42 | (__item)->prev = (__item); \ |
| 43 | (__item)->next = (__item); \ |
| 44 | } while (0) |
| 45 | |
| 46 | #define DRMLISTADD(__item, __list) \ |
| 47 | do { \ |
| 48 | (__item)->prev = (__list); \ |
| 49 | (__item)->next = (__list)->next; \ |
| 50 | (__list)->next->prev = (__item); \ |
| 51 | (__list)->next = (__item); \ |
| 52 | } while (0) |
| 53 | |
| 54 | #define DRMLISTADDTAIL(__item, __list) \ |
| 55 | do { \ |
| 56 | (__item)->next = (__list); \ |
| 57 | (__item)->prev = (__list)->prev; \ |
| 58 | (__list)->prev->next = (__item); \ |
| 59 | (__list)->prev = (__item); \ |
| 60 | } while(0) |
| 61 | |
| 62 | #define DRMLISTDEL(__item) \ |
| 63 | do { \ |
| 64 | (__item)->prev->next = (__item)->next; \ |
| 65 | (__item)->next->prev = (__item)->prev; \ |
| 66 | } while(0) |
| 67 | |
| 68 | #define DRMLISTDELINIT(__item) \ |
| 69 | do { \ |
| 70 | (__item)->prev->next = (__item)->next; \ |
| 71 | (__item)->next->prev = (__item)->prev; \ |
| 72 | (__item)->next = (__item); \ |
| 73 | (__item)->prev = (__item); \ |
| 74 | } while(0) |
| 75 | |
| 76 | #define DRMLISTENTRY(__type, __item, __field) \ |
| 77 | ((__type *)(((char *) (__item)) - offsetof(__type, __field))) |
| 78 | |
| 79 | #define DRMLISTEMPTY(__item) ((__item)->next == (__item)) |
| 80 | |
| 81 | #define DRMLISTFOREACHSAFE(__item, __temp, __list) \ |
| 82 | for ((__item) = (__list)->next, (__temp) = (__item)->next; \ |
| 83 | (__item) != (__list); \ |
| 84 | (__item) = (__temp), (__temp) = (__item)->next) |
| 85 | |
| 86 | #define DRMLISTFOREACHSAFEREVERSE(__item, __temp, __list) \ |
| 87 | for ((__item) = (__list)->prev, (__temp) = (__item)->prev; \ |
| 88 | (__item) != (__list); \ |
| 89 | (__item) = (__temp), (__temp) = (__item)->prev) |