1287 #define DLL_insert(head,tail,element) do { \  argument
1288   EXTRA_CHECK (NULL == (element)->next); \
1289   EXTRA_CHECK (NULL == (element)->prev); \
1290   (element)->next = (head); \
1291   (element)->prev = NULL; \
1293     (tail) = element; \
1295     (head)->prev = element; \
1296   (head) = (element); } while (0)
1308 #define DLL_remove(head,tail,element) do { \  argument
1309   EXTRA_CHECK ( (NULL != (element)->next) || ((element) == (tail)));  \
1310   EXTRA_CHECK ( (NULL != (element)->prev) || ((element) == (head)));  \
1311   if ((element)->prev == NULL) \
1312     (head) = (element)->next;  \
1314     (element)->prev->next = (element)->next; \
1315   if ((element)->next == NULL) \
1316     (tail) = (element)->prev;  \
1318     (element)->next->prev = (element)->prev; \
1319   (element)->next = NULL; \
1320   (element)->prev = NULL; } while (0)
1332 #define XDLL_insert(head,tail,element) do { \  argument
1333   EXTRA_CHECK (NULL == (element)->nextX); \
1334   EXTRA_CHECK (NULL == (element)->prevX); \
1335   (element)->nextX = (head); \
1336   (element)->prevX = NULL; \
1338     (tail) = element; \
1340     (head)->prevX = element; \
1341   (head) = (element); } while (0)
1353 #define XDLL_remove(head,tail,element) do { \  argument
1354   EXTRA_CHECK ( (NULL != (element)->nextX) || ((element) == (tail)));  \
1355   EXTRA_CHECK ( (NULL != (element)->prevX) || ((element) == (head)));  \
1356   if (NULL == (element)->prevX) \
1357     (head) = (element)->nextX;  \
1359     (element)->prevX->nextX = (element)->nextX; \
1360   if (NULL == (element)->nextX) \
1361     (tail) = (element)->prevX;  \
1363     (element)->nextX->prevX = (element)->prevX; \
1364   (element)->nextX = NULL; \
1365   (element)->prevX = NULL; } while (0)
1376 #define EDLL_insert(head,tail,element) do { \  argument
1377   (element)->nextE = (head); \
1378   (element)->prevE = NULL; \
1380     (tail) = element; \
1382     (head)->prevE = element; \
1383   (head) = (element); } while (0)
1395 #define EDLL_remove(head,tail,element) do { \  argument
1396   if ((element)->prevE == NULL) \
1397     (head) = (element)->nextE;  \
1399     (element)->prevE->nextE = (element)->nextE; \
1400   if ((element)->nextE == NULL) \
1401     (tail) = (element)->prevE;  \
1403     (element)->nextE->prevE = (element)->prevE; \
1404   (element)->nextE = NULL; \
1405   (element)->prevE = NULL; } while (0)