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- /**************************************************************************
- *
- * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND. USA.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- */
- /*
- * List macros heavily inspired by the Linux kernel
- * list handling. No list looping yet.
- */
- #include <stddef.h>
- typedef struct _drmMMListHead
- {
- struct _drmMMListHead *prev;
- struct _drmMMListHead *next;
- } drmMMListHead;
- #define DRMINITLISTHEAD(__item) \
- do{ \
- (__item)->prev = (__item); \
- (__item)->next = (__item); \
- } while (0)
- #define DRMLISTADD(__item, __list) \
- do { \
- (__item)->prev = (__list); \
- (__item)->next = (__list)->next; \
- (__list)->next->prev = (__item); \
- (__list)->next = (__item); \
- } while (0)
- #define DRMLISTADDTAIL(__item, __list) \
- do { \
- (__item)->next = (__list); \
- (__item)->prev = (__list)->prev; \
- (__list)->prev->next = (__item); \
- (__list)->prev = (__item); \
- } while(0)
- #define DRMLISTDEL(__item) \
- do { \
- (__item)->prev->next = (__item)->next; \
- (__item)->next->prev = (__item)->prev; \
- } while(0)
- #define DRMLISTDELINIT(__item) \
- do { \
- (__item)->prev->next = (__item)->next; \
- (__item)->next->prev = (__item)->prev; \
- (__item)->next = (__item); \
- (__item)->prev = (__item); \
- } while(0)
- #define DRMLISTENTRY(__type, __item, __field) \
- ((__type *)(((char *) (__item)) - offsetof(__type, __field)))
- #define DRMLISTEMPTY(__item) ((__item)->next == (__item))
- #define DRMLISTSINGLE(__list) \
- (!DRMLISTEMPTY(__list) && ((__list)->next == (__list)->prev))
- #define DRMLISTFOREACH(__item, __list) \
- for ((__item) = (__list)->next; \
- (__item) != (__list); (__item) = (__item)->next)
- #define DRMLISTFOREACHSAFE(__item, __temp, __list) \
- for ((__item) = (__list)->next, (__temp) = (__item)->next; \
- (__item) != (__list); \
- (__item) = (__temp), (__temp) = (__item)->next)
- #define DRMLISTFOREACHSAFEREVERSE(__item, __temp, __list) \
- for ((__item) = (__list)->prev, (__temp) = (__item)->prev; \
- (__item) != (__list); \
- (__item) = (__temp), (__temp) = (__item)->prev)
- #define DRMLISTFOREACHENTRY(__item, __list, __head) \
- for ((__item) = DRMLISTENTRY(typeof(*__item), (__list)->next, __head); \
- &(__item)->__head != (__list); \
- (__item) = DRMLISTENTRY(typeof(*__item), \
- (__item)->__head.next, __head))
- #define DRMLISTFOREACHENTRYSAFE(__item, __temp, __list, __head) \
- for ((__item) = DRMLISTENTRY(typeof(*__item), (__list)->next, __head), \
- (__temp) = DRMLISTENTRY(typeof(*__item), \
- (__item)->__head.next, __head); \
- &(__item)->__head != (__list); \
- (__item) = (__temp), \
- (__temp) = DRMLISTENTRY(typeof(*__item), \
- (__temp)->__head.next, __head))
- #define DRMLISTJOIN(__list, __join) if (!DRMLISTEMPTY(__list)) { \
- (__list)->next->prev = (__join); \
- (__list)->prev->next = (__join)->next; \
- (__join)->next->prev = (__list)->prev; \
- (__join)->next = (__list)->next; \
- }
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