FreeTDS API

dlist.tmpl.h
1 /* Dlist - dynamic list
2 * Copyright (C) 2016 Frediano Ziglio
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20 #include <freetds/bool.h>
21 #include <freetds/utils.h>
22 #include <freetds/macros.h>
23
24 #if !defined(DLIST_PREFIX) || !defined(DLIST_ITEM_TYPE) || !defined(DLIST_LIST_TYPE)
25 #error Required defines for dlist missing!
26 #endif
27
28 #if defined(DLIST_NAME) || defined(DLIST_PASTER) || \
29 defined(DLIST_EVALUATOR) || defined(DLIST_ITEM)
30 #error Some internal dlist macros already defined
31 #endif
32
33 typedef struct
34 {
35 dlist_ring ring;
36 } DLIST_LIST_TYPE;
37
38 #define DLIST_PASTER(x,y) x ## _ ## y
39 #define DLIST_EVALUATOR(x,y) DLIST_PASTER(x,y)
40 #define DLIST_NAME(suffix) DLIST_EVALUATOR(DLIST_PREFIX, suffix)
41 #define DLIST_ITEM(ring) \
42 ((DLIST_ITEM_TYPE *) (((char *) (ring)) - TDS_OFFSET(DLIST_ITEM_TYPE, DLIST_NAME(item))))
43
44 static inline void DLIST_NAME(check)(DLIST_LIST_TYPE *list)
45 {
46 #if ENABLE_EXTRA_CHECKS
47 assert(list != NULL);
48 dlist_ring_check(&list->ring);
49 #endif
50 }
51
52 static inline void DLIST_NAME(init)(DLIST_LIST_TYPE *list)
53 {
54 list->ring.next = list->ring.prev = &list->ring;
55 DLIST_NAME(check)(list);
56 }
57
58 static inline DLIST_ITEM_TYPE *DLIST_NAME(first)(DLIST_LIST_TYPE *list)
59 {
60 return list->ring.next == &list->ring ? NULL : DLIST_ITEM(list->ring.next);
61 }
62
63 static inline DLIST_ITEM_TYPE *DLIST_NAME(last)(DLIST_LIST_TYPE *list)
64 {
65 return list->ring.prev == &list->ring ? NULL : DLIST_ITEM(list->ring.prev);
66 }
67
68 static inline DLIST_ITEM_TYPE *DLIST_NAME(next)(DLIST_LIST_TYPE *list, DLIST_ITEM_TYPE *item)
69 {
70 return item->DLIST_NAME(item).next == &list->ring ? NULL : DLIST_ITEM(item->DLIST_NAME(item).next);
71 }
72
73 static inline DLIST_ITEM_TYPE *DLIST_NAME(prev)(DLIST_LIST_TYPE *list, DLIST_ITEM_TYPE *item)
74 {
75 return item->DLIST_NAME(item).prev == &list->ring ? NULL : DLIST_ITEM(item->DLIST_NAME(item).prev);
76 }
77
78 static inline void DLIST_NAME(prepend)(DLIST_LIST_TYPE *list, DLIST_ITEM_TYPE *item)
79 {
80 DLIST_NAME(check)(list);
81 dlist_insert_after(&list->ring, &item->DLIST_NAME(item));
82 DLIST_NAME(check)(list);
83 }
84
85 static inline void DLIST_NAME(append)(DLIST_LIST_TYPE *list, DLIST_ITEM_TYPE *item)
86 {
87 DLIST_NAME(check)(list);
88 dlist_insert_after(list->ring.prev, &item->DLIST_NAME(item));
89 DLIST_NAME(check)(list);
90 }
91
92 static inline void DLIST_NAME(remove)(DLIST_LIST_TYPE *list, DLIST_ITEM_TYPE *item)
93 {
94 dlist_ring *prev = item->DLIST_NAME(item).prev, *next = item->DLIST_NAME(item).next;
95 DLIST_NAME(check)(list);
96 if (prev) {
97 prev->next = next;
98 next->prev = prev;
99 }
100 item->DLIST_NAME(item).prev = NULL;
101 item->DLIST_NAME(item).next = NULL;
102 DLIST_NAME(check)(list);
103 }
104
105 static inline bool DLIST_NAME(in_list)(DLIST_LIST_TYPE *list, DLIST_ITEM_TYPE *item)
106 {
107 DLIST_NAME(check)(list);
108 return item->DLIST_NAME(item).prev != NULL || item->DLIST_NAME(item).next != NULL;
109 }
110
111 #undef DLIST_ITEM
112 #undef DLIST_NAME
113 #undef DLIST_ITEM_TYPE
114 #undef DLIST_LIST_TYPE
115 #undef DLIST_PREFIX
116 #undef DLIST_PASTER
117 #undef DLIST_EVALUATOR
118
dlist_ring
Definition: dlist.h:23
DLIST_LIST_TYPE
Definition: dlist.tmpl.h:33