ioncore/region-iter.h

   1 /*
   2  * ion/ioncore/region-iter.h
   3  *
   4  * Copyright (c) Tuomo Valkonen 1999-2009.
   5  *
   6  * See the included file LICENSE for details.
   7  */
   8
   9 #ifndef ION_IONCORE_REGION_ITER_H
  10 #define ION_IONCORE_REGION_ITER_H
  11
  12 #define REGION_FIRST_CHILD(PAR) (((WRegion*)(PAR))->children)
  13 #define REGION_LAST_CHILD(PAR)                                               \
  14  (REGION_FIRST_CHILD(PAR)==NULL ? NULL                                       \
  15  : REGION_PREV_CHILD_WRAP(REGION_FIRST_CHILD(PAR), REGION_FIRST_CHILD(PAR)))
  16 #define REGION_NEXT_CHILD(PAR, REG) (((WRegion*)(REG))->p_next)
  17 #define REGION_PREV_CHILD(PAR, REG) ((((WRegion*)(REG))->p_prev->p_next) ? \
  18                                  (((WRegion*)(REG))->p_prev) : NULL)
  19 #define REGION_NEXT_CHILD_WRAP(PAR, REG)                 \
  20   (((REG) && ((WRegion*)(REG))->p_next)                  \
  21   ? ((WRegion*)(REG))->p_next : REGION_FIRST_CHILD(PAR))
  22 #define REGION_PREV_CHILD_WRAP(PAR, REG) \
  23   ((REG) ? ((WRegion*)(REG))->p_prev     \
  24   : REGION_FIRST_CHILD(PAR))
  25
  26 #define FOR_ALL_CHILDREN(PAR, REG) \
  27     for((REG)=((WRegion*)(PAR))->children; (REG)!=NULL; (REG)=(REG)->p_next)
  28
  29 #define FOR_ALL_CHILDREN_W_NEXT(PAR, REG, NEXT)                              \
  30   for((REG)=((WRegion*)(PAR))->children, (NEXT)=((REG)==NULL ? NULL : (REG)->p_next);\
  31       (REG)!=NULL;                                                            \
  32       (REG)=(NEXT), (NEXT)=((REG)==NULL ? NULL : (REG)->p_next))
  33
  34 #endif /* ION_IONCORE_REGION_ITER_H */