IABSD.fr/xenocara/lib/libdrm/libdrm_lists.h

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• Author : jsg
  Date : 2022-04-29 10:16:20
  Hash : b5f18b0c
  Message : Merge libdrm 2.4.110

• lib/libdrm/libdrm_lists.h

• /**************************************************************************
   *
   * 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;				\
  }