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   1 /* A queue definition based on sys/queue.h TAILQ definitions
   2  *
   3  * Copyright 2000 Peter Hunnisett
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  18  *
  19  * NOTES
  20  *  o Linked list implementation for dplay/dplobby. Based off of the BSD
  21  *    version found in <sys/queue.h>
  22  *  o Port it to <wine/list.h> ?
  23  *
  24  */
  25
  26 #ifndef __WINE_DPLAYX_QUEUE_H
  27 #define __WINE_DPLAYX_QUEUE_H
  28
  29 #include <stdarg.h>
  30
  31 #include "windef.h"
  32 #include "winbase.h"
  33
  34 #define DPQ_INSERT(a,b,c) DPQ_INSERT_IN_TAIL(a,b,c)
  35
  36 /*
  37  * Tail queue definitions.
  38  */
  39 #define DPQ_HEAD(type)                                           \
  40 struct {                                                         \
  41         struct type *lpQHFirst; /* first element */              \
  42         struct type **lpQHLast; /* addr of last next element */  \
  43 }
  44
  45 #define DPQ_ENTRY(type)                                               \
  46 struct {                                                              \
  47         struct type *lpQNext;  /* next element */                     \
  48         struct type **lpQPrev; /* address of previous next element */ \
  49 }
  50
  51 /*
  52  * Tail queue functions.
  53  */
  54 #define DPQ_INIT(head)                       \
  55 do{                                          \
  56         (head).lpQHFirst = NULL;             \
  57         (head).lpQHLast = &(head).lpQHFirst; \
  58 } while(0)
  59
  60 /* Front of the queue */
  61 #define DPQ_FIRST( head ) ( (head).lpQHFirst )
  62
  63 /* Check if the queue has any elements */
  64 #define DPQ_IS_EMPTY( head ) ( DPQ_FIRST(head) == NULL )
  65
  66 /* Next entry -- FIXME: Convert everything over to this macro ... */
  67 #define DPQ_NEXT( elem ) (elem).lpQNext
  68
  69 #define DPQ_IS_ENDOFLIST( elem ) \
  70     ( DPQ_NEXT(elem) == NULL )
  71
  72 /* Insert element at end of queue */
  73 #define DPQ_INSERT_IN_TAIL(head, elm, field)     \
  74 do {                                             \
  75         (elm)->field.lpQNext = NULL;             \
  76         (elm)->field.lpQPrev = (head).lpQHLast;  \
  77         *(head).lpQHLast = (elm);                \
  78         (head).lpQHLast = &(elm)->field.lpQNext; \
  79 } while(0)
  80
  81 /* Remove element from the queue */
  82 #define DPQ_REMOVE(head, elm, field)                    \
  83 do {                                                    \
  84         if (((elm)->field.lpQNext) != NULL)             \
  85                 (elm)->field.lpQNext->field.lpQPrev =   \
  86                     (elm)->field.lpQPrev;               \
  87         else                                            \
  88                 (head).lpQHLast = (elm)->field.lpQPrev; \
  89         *(elm)->field.lpQPrev = (elm)->field.lpQNext;   \
  90 } while(0)
  91
  92 /* head - pointer to DPQ_HEAD struct
  93  * elm  - how to find the next element
  94  * field - to be concatenated to rc to compare with fieldToCompare
  95  * fieldToCompare - The value that we're comparing against
  96  * fieldCompareOperator - The logical operator to compare field and
  97  *                        fieldToCompare.
  98  * rc - Variable to put the return code. Same type as (head).lpQHFirst
  99  */
 100 #define DPQ_FIND_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc )\
 101 do {                                                           \
 102   (rc) = DPQ_FIRST(head); /* NULL head? */                     \
 103                                                                \
 104   while( rc )                                                  \
 105   {                                                            \
 106       /* What we're searching for? */                          \
 107       if( (rc)->field fieldCompareOperator (fieldToCompare) )  \
 108       {                                                        \
 109         break; /* rc == correct element */                     \
 110       }                                                        \
 111                                                                \
 112       /* End of list check */                                  \
 113       if( ( (rc) = (rc)->elm.lpQNext ) == (head).lpQHFirst )   \
 114       {                                                        \
 115         rc = NULL;                                             \
 116         break;                                                 \
 117       }                                                        \
 118   }                                                            \
 119 } while(0)
 120
 121 /* head - pointer to DPQ_HEAD struct
 122  * elm  - how to find the next element
 123  * field - to be concatenated to rc to compare with fieldToCompare
 124  * fieldToCompare - The value that we're comparing against
 125  * compare_cb - Callback to invoke to determine if comparision should continue.
 126  *              Callback must be defined with DPQ_DECL_COMPARECB.
 127  * rc - Variable to put the return code. Same type as (head).lpQHFirst
 128  */
 129 #define DPQ_FIND_ENTRY_CB( head, elm, field, compare_cb, fieldToCompare, rc )\
 130 do {                                                           \
 131   (rc) = DPQ_FIRST(head); /* NULL head? */                     \
 132                                                                \
 133   while( rc )                                                  \
 134   {                                                            \
 135       /* What we're searching for? */                          \
 136       if( compare_cb( &((rc)->field), &(fieldToCompare) ) )    \
 137       {                                                        \
 138         break; /* no more */                                   \
 139       }                                                        \
 140                                                                \
 141       /* End of list check */                                  \
 142       if( ( (rc) = (rc)->elm.lpQNext ) == (head).lpQHFirst )   \
 143       {                                                        \
 144         rc = NULL;                                             \
 145         break;                                                 \
 146       }                                                        \
 147   }                                                            \
 148 } while(0)
 149
 150 /* How to define the method to be passed to DPQ_DELETEQ */
 151 #define DPQ_DECL_COMPARECB( name, type ) BOOL name( const type* elem1, const type* elem2 )
 152
 153
 154 /* head - pointer to DPQ_HEAD struct
 155  * elm  - how to find the next element
 156  * field - to be concatenated to rc to compare with fieldToEqual
 157  * fieldToCompare - The value that we're comparing against
 158  * fieldCompareOperator - The logical operator to compare field and
 159  *                        fieldToCompare.
 160  * rc - Variable to put the return code. Same type as (head).lpQHFirst
 161  */
 162 #define DPQ_REMOVE_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc )\
 163 do {                                                           \
 164   DPQ_FIND_ENTRY( head, elm, field, fieldCompareOperator, fieldToCompare, rc );\
 165                                                                \
 166   /* Was the element found? */                                 \
 167   if( rc )                                                     \
 168   {                                                            \
 169     DPQ_REMOVE( head, rc, elm );                               \
 170   }                                                            \
 171 } while(0)
 172
 173 /* head - pointer to DPQ_HEAD struct
 174  * elm  - how to find the next element
 175  * field - to be concatenated to rc to compare with fieldToCompare
 176  * fieldToCompare - The value that we're comparing against
 177  * compare_cb - Callback to invoke to determine if comparision should continue.
 178  *              Callback must be defined with DPQ_DECL_COMPARECB.
 179  * rc - Variable to put the return code. Same type as (head).lpQHFirst
 180  */
 181 #define DPQ_REMOVE_ENTRY_CB( head, elm, field, compare_cb, fieldToCompare, rc )\
 182 do {                                                           \
 183   DPQ_FIND_ENTRY_CB( head, elm, field, compare_cb, fieldToCompare, rc );\
 184                                                                \
 185   /* Was the element found? */                                 \
 186   if( rc )                                                     \
 187   {                                                            \
 188     DPQ_REMOVE( head, rc, elm );                               \
 189   }                                                            \
 190 } while(0)
 191
 192
 193 /* Delete the entire queue
 194  * head - pointer to the head of the queue
 195  * field - field to access the next elements of the queue
 196  * type - type of the pointer to the element element
 197  * df - a delete function to be called. Declared with DPQ_DECL_DELETECB.
 198  */
 199 #define DPQ_DELETEQ( head, field, type, df )     \
 200 do                                               \
 201 {                                                \
 202   while( !DPQ_IS_EMPTY(head) )                   \
 203   {                                              \
 204     type holder = DPQ_FIRST(head);               \
 205     DPQ_REMOVE( head, holder, field );           \
 206     df( holder );                                \
 207   }                                              \
 208 } while(0)
 209
 210 /* How to define the method to be passed to DPQ_DELETEQ */
 211 #define DPQ_DECL_DELETECB( name, type ) void name( type elem )
 212
 213 /* Prototype of a method which just performs a HeapFree on the elem */
 214 DPQ_DECL_DELETECB( cbDeleteElemFromHeap, LPVOID );
 215
 216 #endif /* __WINE_DPLAYX_QUEUE_H */