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80911bc2 DL |
1 | /* |
2 | * The following Red-Black tree implementation is based off code with | |
3 | * original copyright: | |
4 | * | |
5 | * Copyright (c) 2016 David Gwynne <dlg@openbsd.org> | |
6 | * | |
7 | * Permission to use, copy, modify, and distribute this software for any | |
8 | * purpose with or without fee is hereby granted, provided that the above | |
9 | * copyright notice and this permission notice appear in all copies. | |
10 | * | |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | */ | |
19 | ||
20 | #ifndef _FRR_TYPERB_H | |
21 | #define _FRR_TYPERB_H | |
22 | ||
23 | #include "typesafe.h" | |
24 | ||
eea3c899 RW |
25 | #ifdef __cplusplus |
26 | extern "C" { | |
27 | #endif | |
28 | ||
80911bc2 DL |
29 | struct typed_rb_entry { |
30 | struct typed_rb_entry *rbt_parent; | |
31 | struct typed_rb_entry *rbt_left; | |
32 | struct typed_rb_entry *rbt_right; | |
33 | unsigned int rbt_color; | |
34 | }; | |
35 | ||
36 | struct typed_rb_root { | |
37 | struct typed_rb_entry *rbt_root; | |
38 | size_t count; | |
39 | }; | |
40 | ||
571a045b | 41 | struct typed_rb_entry *typed_rb_insert(struct typed_rb_root *rbt, |
80911bc2 DL |
42 | struct typed_rb_entry *rbe, |
43 | int (*cmpfn)( | |
44 | const struct typed_rb_entry *a, | |
45 | const struct typed_rb_entry *b)); | |
571a045b | 46 | struct typed_rb_entry *typed_rb_remove(struct typed_rb_root *rbt, |
da098d78 | 47 | struct typed_rb_entry *rbe); |
daf3441d | 48 | const struct typed_rb_entry *typed_rb_find(const struct typed_rb_root *rbt, |
80911bc2 DL |
49 | const struct typed_rb_entry *rbe, |
50 | int (*cmpfn)( | |
51 | const struct typed_rb_entry *a, | |
52 | const struct typed_rb_entry *b)); | |
daf3441d | 53 | const struct typed_rb_entry *typed_rb_find_gteq(const struct typed_rb_root *rbt, |
80911bc2 DL |
54 | const struct typed_rb_entry *rbe, |
55 | int (*cmpfn)( | |
56 | const struct typed_rb_entry *a, | |
57 | const struct typed_rb_entry *b)); | |
daf3441d | 58 | const struct typed_rb_entry *typed_rb_find_lt(const struct typed_rb_root *rbt, |
80911bc2 DL |
59 | const struct typed_rb_entry *rbe, |
60 | int (*cmpfn)( | |
61 | const struct typed_rb_entry *a, | |
62 | const struct typed_rb_entry *b)); | |
daf3441d DL |
63 | struct typed_rb_entry *typed_rb_min(const struct typed_rb_root *rbt); |
64 | struct typed_rb_entry *typed_rb_next(const struct typed_rb_entry *rbe); | |
f45897e4 DL |
65 | bool typed_rb_member(const struct typed_rb_root *rbt, |
66 | const struct typed_rb_entry *rbe); | |
80911bc2 DL |
67 | |
68 | #define _PREDECL_RBTREE(prefix) \ | |
69 | struct prefix ## _head { struct typed_rb_root rr; }; \ | |
960b9a53 DL |
70 | struct prefix ## _item { struct typed_rb_entry re; }; \ |
71 | MACRO_REQUIRE_SEMICOLON() /* end */ | |
80911bc2 DL |
72 | |
73 | #define INIT_RBTREE_UNIQ(var) { } | |
74 | #define INIT_RBTREE_NONUNIQ(var) { } | |
75 | ||
76 | #define _DECLARE_RBTREE(prefix, type, field, cmpfn_nuq, cmpfn_uq) \ | |
77 | \ | |
78 | macro_inline void prefix ## _init(struct prefix##_head *h) \ | |
79 | { \ | |
80 | memset(h, 0, sizeof(*h)); \ | |
81 | } \ | |
82 | macro_inline void prefix ## _fini(struct prefix##_head *h) \ | |
83 | { \ | |
84 | memset(h, 0, sizeof(*h)); \ | |
85 | } \ | |
86 | macro_inline type *prefix ## _add(struct prefix##_head *h, type *item) \ | |
87 | { \ | |
88 | struct typed_rb_entry *re; \ | |
89 | re = typed_rb_insert(&h->rr, &item->field.re, cmpfn_uq); \ | |
90 | return container_of_null(re, type, field.re); \ | |
91 | } \ | |
daf3441d DL |
92 | macro_inline const type *prefix ## _const_find_gteq( \ |
93 | const struct prefix##_head *h, const type *item) \ | |
80911bc2 | 94 | { \ |
daf3441d | 95 | const struct typed_rb_entry *re; \ |
80911bc2 DL |
96 | re = typed_rb_find_gteq(&h->rr, &item->field.re, cmpfn_nuq); \ |
97 | return container_of_null(re, type, field.re); \ | |
98 | } \ | |
daf3441d DL |
99 | macro_inline const type *prefix ## _const_find_lt( \ |
100 | const struct prefix##_head *h, const type *item) \ | |
80911bc2 | 101 | { \ |
daf3441d | 102 | const struct typed_rb_entry *re; \ |
80911bc2 DL |
103 | re = typed_rb_find_lt(&h->rr, &item->field.re, cmpfn_nuq); \ |
104 | return container_of_null(re, type, field.re); \ | |
105 | } \ | |
daf3441d | 106 | TYPESAFE_FIND_CMP(prefix, type) \ |
da098d78 | 107 | macro_inline type *prefix ## _del(struct prefix##_head *h, type *item) \ |
80911bc2 | 108 | { \ |
da098d78 SW |
109 | struct typed_rb_entry *re; \ |
110 | re = typed_rb_remove(&h->rr, &item->field.re); \ | |
111 | return container_of_null(re, type, field.re); \ | |
80911bc2 DL |
112 | } \ |
113 | macro_inline type *prefix ## _pop(struct prefix##_head *h) \ | |
114 | { \ | |
115 | struct typed_rb_entry *re; \ | |
116 | re = typed_rb_min(&h->rr); \ | |
117 | if (!re) \ | |
118 | return NULL; \ | |
119 | typed_rb_remove(&h->rr, re); \ | |
120 | return container_of(re, type, field.re); \ | |
121 | } \ | |
507e0e5d | 122 | TYPESAFE_SWAP_ALL_SIMPLE(prefix) \ |
daf3441d | 123 | macro_pure const type *prefix ## _const_first(const struct prefix##_head *h) \ |
80911bc2 | 124 | { \ |
daf3441d | 125 | const struct typed_rb_entry *re; \ |
80911bc2 DL |
126 | re = typed_rb_min(&h->rr); \ |
127 | return container_of_null(re, type, field.re); \ | |
128 | } \ | |
daf3441d DL |
129 | macro_pure const type *prefix ## _const_next(const struct prefix##_head *h, \ |
130 | const type *item) \ | |
80911bc2 | 131 | { \ |
daf3441d | 132 | const struct typed_rb_entry *re; \ |
80911bc2 DL |
133 | re = typed_rb_next(&item->field.re); \ |
134 | return container_of_null(re, type, field.re); \ | |
135 | } \ | |
daf3441d | 136 | TYPESAFE_FIRST_NEXT(prefix, type) \ |
80911bc2 DL |
137 | macro_pure type *prefix ## _next_safe(struct prefix##_head *h, type *item) \ |
138 | { \ | |
139 | struct typed_rb_entry *re; \ | |
140 | re = item ? typed_rb_next(&item->field.re) : NULL; \ | |
141 | return container_of_null(re, type, field.re); \ | |
142 | } \ | |
0ca16c58 | 143 | macro_pure size_t prefix ## _count(const struct prefix##_head *h) \ |
80911bc2 DL |
144 | { \ |
145 | return h->rr.count; \ | |
146 | } \ | |
f45897e4 DL |
147 | macro_pure bool prefix ## _member(const struct prefix##_head *h, \ |
148 | const type *item) \ | |
149 | { \ | |
150 | return typed_rb_member(&h->rr, &item->field.re); \ | |
151 | } \ | |
960b9a53 | 152 | MACRO_REQUIRE_SEMICOLON() /* end */ |
80911bc2 DL |
153 | |
154 | #define PREDECL_RBTREE_UNIQ(prefix) \ | |
155 | _PREDECL_RBTREE(prefix) | |
156 | #define DECLARE_RBTREE_UNIQ(prefix, type, field, cmpfn) \ | |
157 | \ | |
158 | macro_inline int prefix ## __cmp(const struct typed_rb_entry *a, \ | |
159 | const struct typed_rb_entry *b) \ | |
160 | { \ | |
161 | return cmpfn(container_of(a, type, field.re), \ | |
162 | container_of(b, type, field.re)); \ | |
163 | } \ | |
daf3441d DL |
164 | macro_inline const type *prefix ## _const_find(const struct prefix##_head *h, \ |
165 | const type *item) \ | |
80911bc2 | 166 | { \ |
daf3441d | 167 | const struct typed_rb_entry *re; \ |
80911bc2 DL |
168 | re = typed_rb_find(&h->rr, &item->field.re, &prefix ## __cmp); \ |
169 | return container_of_null(re, type, field.re); \ | |
170 | } \ | |
daf3441d | 171 | TYPESAFE_FIND(prefix, type) \ |
80911bc2 | 172 | \ |
960b9a53 DL |
173 | _DECLARE_RBTREE(prefix, type, field, prefix ## __cmp, prefix ## __cmp); \ |
174 | MACRO_REQUIRE_SEMICOLON() /* end */ | |
80911bc2 DL |
175 | |
176 | #define PREDECL_RBTREE_NONUNIQ(prefix) \ | |
177 | _PREDECL_RBTREE(prefix) | |
178 | #define DECLARE_RBTREE_NONUNIQ(prefix, type, field, cmpfn) \ | |
179 | \ | |
180 | macro_inline int prefix ## __cmp(const struct typed_rb_entry *a, \ | |
181 | const struct typed_rb_entry *b) \ | |
182 | { \ | |
183 | return cmpfn(container_of(a, type, field.re), \ | |
184 | container_of(b, type, field.re)); \ | |
185 | } \ | |
186 | macro_inline int prefix ## __cmp_uq(const struct typed_rb_entry *a, \ | |
187 | const struct typed_rb_entry *b) \ | |
188 | { \ | |
189 | int cmpval = cmpfn(container_of(a, type, field.re), \ | |
190 | container_of(b, type, field.re)); \ | |
191 | if (cmpval) \ | |
192 | return cmpval; \ | |
193 | if (a < b) \ | |
194 | return -1; \ | |
195 | if (a > b) \ | |
196 | return 1; \ | |
197 | return 0; \ | |
198 | } \ | |
199 | \ | |
960b9a53 DL |
200 | _DECLARE_RBTREE(prefix, type, field, prefix ## __cmp, prefix ## __cmp_uq); \ |
201 | MACRO_REQUIRE_SEMICOLON() /* end */ | |
80911bc2 | 202 | |
eea3c899 RW |
203 | #ifdef __cplusplus |
204 | } | |
205 | #endif | |
206 | ||
80911bc2 | 207 | #endif /* _FRR_TYPERB_H */ |