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   1
   2 /* Helper functions for TAILQ functions defined in <sys/queue.h>
   3  *
   4  * Blame any implementation mistakes on Peter Hunnisett
   5  * <hunnise@nortelnetworks.com>
   6  */
   7
   8 #ifndef __WINE_DPLAYX_QUEUE_H
   9 #define __WINE_DPLAYX_QUEUE_H
  10
  11 #include <sys/queue.h>
  12
  13 /* head - pointer to TAILQ_HEAD struct
  14  * elm  - how to find the next element
  15  * field - to be concatenated to rc to compare with fieldToEqual
  16  * fieldToEqual - The value that we're looking for
  17  * rc - Variable to put the return code. Same type as (head)->tqh_first
  18  */
  19 #define TAILQ_FIND_ENTRY( head, elm, field, fieldToEqual, rc ) { \
  20   (rc) = (head)->tqh_first; /* NULL head? */                    \
  21                                                                  \
  22   while( rc )                                                    \
  23   {                                                              \
  24       /* What we're searching for? */                            \
  25       if( (rc)->field == (fieldToEqual) )                        \
  26       {                                                          \
  27         break; /* rc == correct element */                       \
  28       }                                                          \
  29                                                                  \
  30       /* End of list check */                                    \
  31       if( ( (rc) = (rc)->elm.tqe_next ) == (head)->tqh_first )   \
  32       {                                                          \
  33         rc = NULL;                                               \
  34         break;                                                   \
  35       }                                                          \
  36   }                                                              \
  37 }
  38
  39 #endif /* __WINE_DPLAYX_QUEUE_H */