Mercurial > hg > nginx-quic
annotate src/core/ngx_array.c @ 588:0a2c30f516e6
release-0.3.15 tag
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 07 Dec 2005 14:51:31 +0000 |
parents | d4ea69372b94 |
children | 5dac8c7fb71b |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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485 | 11 ngx_array_t *ngx_array_create(ngx_pool_t *p, ngx_uint_t n, size_t size) |
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12 { |
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13 ngx_array_t *a; |
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14 |
501 | 15 a = ngx_palloc(p, sizeof(ngx_array_t)); |
16 if (a == NULL) { | |
485 | 17 return NULL; |
18 } | |
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19 |
501 | 20 a->elts = ngx_palloc(p, n * size); |
21 if (a->elts == NULL) { | |
485 | 22 return NULL; |
23 } | |
24 | |
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25 a->nelts = 0; |
485 | 26 a->size = size; |
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27 a->nalloc = n; |
485 | 28 a->pool = p; |
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29 |
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30 return a; |
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31 } |
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485 | 34 void ngx_array_destroy(ngx_array_t *a) |
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35 { |
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36 ngx_pool_t *p; |
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38 p = a->pool; |
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485 | 40 if ((u_char *) a->elts + a->size * a->nalloc == p->last) { |
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41 p->last -= a->size * a->nalloc; |
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42 } |
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485 | 44 if ((u_char *) a + sizeof(ngx_array_t) == p->last) { |
45 p->last = (u_char *) a; | |
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46 } |
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47 } |
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485 | 50 void *ngx_array_push(ngx_array_t *a) |
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51 { |
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52 void *elt, *new; |
485 | 53 size_t size; |
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54 ngx_pool_t *p; |
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55 |
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56 if (a->nelts == a->nalloc) { |
485 | 57 |
58 /* the array is full */ | |
59 | |
60 size = a->size * a->nalloc; | |
61 | |
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62 p = a->pool; |
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485 | 64 if ((u_char *) a->elts + size == p->last && p->last + a->size <= p->end) |
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65 { |
485 | 66 /* |
67 * the array allocation is the last in the pool | |
68 * and there is space for new allocation | |
69 */ | |
70 | |
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71 p->last += a->size; |
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72 a->nalloc++; |
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73 |
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74 } else { |
485 | 75 /* allocate a new array */ |
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501 | 77 new = ngx_palloc(p, 2 * size); |
78 if (new == NULL) { | |
485 | 79 return NULL; |
80 } | |
81 | |
82 ngx_memcpy(new, a->elts, size); | |
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83 a->elts = new; |
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84 a->nalloc *= 2; |
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85 } |
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86 } |
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87 |
485 | 88 elt = (u_char *) a->elts + a->size * a->nelts; |
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89 a->nelts++; |
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90 |
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91 return elt; |
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92 } |
485 | 93 |
94 | |
95 void *ngx_array_push_n(ngx_array_t *a, ngx_uint_t n) | |
96 { | |
97 void *elt, *new; | |
98 size_t size; | |
99 ngx_uint_t nalloc; | |
100 ngx_pool_t *p; | |
101 | |
102 size = n * a->size; | |
103 | |
104 if (a->nelts + n > a->nalloc) { | |
105 | |
106 /* the array is full */ | |
107 | |
108 p = a->pool; | |
109 | |
110 if ((u_char *) a->elts + a->size * a->nalloc == p->last | |
111 && p->last + size <= p->end) | |
112 { | |
113 /* | |
114 * the array allocation is the last in the pool | |
115 * and there is space for new allocation | |
116 */ | |
117 | |
118 p->last += size; | |
119 a->nalloc += n; | |
120 | |
121 } else { | |
122 /* allocate a new array */ | |
123 | |
124 nalloc = 2 * ((n >= a->nalloc) ? n : a->nalloc); | |
125 | |
501 | 126 new = ngx_palloc(p, nalloc * a->size); |
127 if (new == NULL) { | |
485 | 128 return NULL; |
129 } | |
130 | |
131 ngx_memcpy(new, a->elts, a->nelts * a->size); | |
132 a->elts = new; | |
133 a->nalloc = nalloc; | |
134 } | |
135 } | |
136 | |
137 elt = (u_char *) a->elts + a->size * a->nelts; | |
138 a->nelts += n; | |
139 | |
140 return elt; | |
141 } |