1 /**************************************************************************
2 *
3 * Copyright 2010 Luca Barbieri
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial
15 * portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 *
25 **************************************************************************/
26
27 #ifndef U_DYNARRAY_H
28 #define U_DYNARRAY_H
29
30 #include "pipe/p_compiler.h"
31 #include "util/u_memory.h"
32
33 /* A zero-initialized version of this is guaranteed to represent an
34 * empty array.
35 *
36 * Also, size <= capacity and data != 0 if and only if capacity != 0
37 * capacity will always be the allocation size of data
38 */
39 struct util_dynarray
40 {
41 void *data;
42 unsigned size;
43 unsigned capacity;
44 };
45
46 static INLINE void
util_dynarray_init(struct util_dynarray * buf)47 util_dynarray_init(struct util_dynarray *buf)
48 {
49 memset(buf, 0, sizeof(*buf));
50 }
51
52 static INLINE void
util_dynarray_fini(struct util_dynarray * buf)53 util_dynarray_fini(struct util_dynarray *buf)
54 {
55 if(buf->data)
56 {
57 FREE(buf->data);
58 util_dynarray_init(buf);
59 }
60 }
61
62 /* use util_dynarray_trim to reduce the allocated storage */
63 static INLINE void *
util_dynarray_resize(struct util_dynarray * buf,unsigned newsize)64 util_dynarray_resize(struct util_dynarray *buf, unsigned newsize)
65 {
66 char *p;
67 if(newsize > buf->capacity)
68 {
69 unsigned newcap = buf->capacity << 1;
70 if(newsize > newcap)
71 newcap = newsize;
72 buf->data = REALLOC(buf->data, buf->capacity, newcap);
73 buf->capacity = newcap;
74 }
75
76 p = (char *)buf->data + buf->size;
77 buf->size = newsize;
78 return p;
79 }
80
81 static INLINE void *
util_dynarray_grow(struct util_dynarray * buf,int diff)82 util_dynarray_grow(struct util_dynarray *buf, int diff)
83 {
84 return util_dynarray_resize(buf, buf->size + diff);
85 }
86
87 static INLINE void
util_dynarray_trim(struct util_dynarray * buf)88 util_dynarray_trim(struct util_dynarray *buf)
89 {
90 if (buf->size != buf->capacity) {
91 if (buf->size) {
92 buf->data = REALLOC(buf->data, buf->capacity, buf->size);
93 buf->capacity = buf->size;
94 }
95 else {
96 FREE(buf->data);
97 buf->data = 0;
98 buf->capacity = 0;
99 }
100 }
101 }
102
103 #define util_dynarray_append(buf, type, v) do {type __v = (v); memcpy(util_dynarray_grow((buf), sizeof(type)), &__v, sizeof(type));} while(0)
104 #define util_dynarray_top_ptr(buf, type) (type*)((char*)(buf)->data + (buf)->size - sizeof(type))
105 #define util_dynarray_top(buf, type) *util_dynarray_top_ptr(buf, type)
106 #define util_dynarray_pop_ptr(buf, type) (type*)((char*)(buf)->data + ((buf)->size -= sizeof(type)))
107 #define util_dynarray_pop(buf, type) *util_dynarray_pop_ptr(buf, type)
108 #define util_dynarray_contains(buf, type) ((buf)->size >= sizeof(type))
109 #define util_dynarray_element(buf, type, idx) ((type*)(buf)->data + (idx))
110 #define util_dynarray_begin(buf) ((buf)->data)
111 #define util_dynarray_end(buf) ((void*)util_dynarray_element((buf), char, (buf)->size))
112
113 #endif /* U_DYNARRAY_H */
114
115