Mercurial > hg > nginx
annotate src/core/ngx_array.c @ 7682:2ab0ecfe5a5f
release-1.19.1 tag
| author | Maxim Dounin <mdounin@mdounin.ru> |
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| date | Tue, 07 Jul 2020 18:56:06 +0300 |
| parents | 4fef8ed52389 |
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| rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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| 605 | 12 ngx_array_t * |
| 13 ngx_array_create(ngx_pool_t *p, ngx_uint_t n, size_t size) | |
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14 { |
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15 ngx_array_t *a; |
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16 |
| 501 | 17 a = ngx_palloc(p, sizeof(ngx_array_t)); |
| 18 if (a == NULL) { | |
| 485 | 19 return NULL; |
| 20 } | |
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21 |
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22 if (ngx_array_init(a, p, n, size) != NGX_OK) { |
| 485 | 23 return NULL; |
| 24 } | |
| 25 | |
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26 return a; |
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27 } |
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28 |
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29 |
| 605 | 30 void |
| 31 ngx_array_destroy(ngx_array_t *a) | |
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32 { |
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33 ngx_pool_t *p; |
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34 |
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35 p = a->pool; |
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36 |
| 2049 | 37 if ((u_char *) a->elts + a->size * a->nalloc == p->d.last) { |
| 38 p->d.last -= a->size * a->nalloc; | |
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39 } |
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40 |
| 2049 | 41 if ((u_char *) a + sizeof(ngx_array_t) == p->d.last) { |
| 42 p->d.last = (u_char *) a; | |
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43 } |
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44 } |
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45 |
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46 |
| 605 | 47 void * |
| 48 ngx_array_push(ngx_array_t *a) | |
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49 { |
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50 void *elt, *new; |
| 485 | 51 size_t size; |
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52 ngx_pool_t *p; |
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53 |
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54 if (a->nelts == a->nalloc) { |
| 485 | 55 |
| 56 /* the array is full */ | |
| 57 | |
| 58 size = a->size * a->nalloc; | |
| 59 | |
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60 p = a->pool; |
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61 |
| 2049 | 62 if ((u_char *) a->elts + size == p->d.last |
| 63 && p->d.last + a->size <= p->d.end) | |
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64 { |
| 485 | 65 /* |
| 66 * the array allocation is the last in the pool | |
| 67 * and there is space for new allocation | |
| 68 */ | |
| 69 | |
| 2049 | 70 p->d.last += a->size; |
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71 a->nalloc++; |
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72 |
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73 } else { |
| 485 | 74 /* allocate a new array */ |
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75 |
| 501 | 76 new = ngx_palloc(p, 2 * size); |
| 77 if (new == NULL) { | |
| 485 | 78 return NULL; |
| 79 } | |
| 80 | |
| 81 ngx_memcpy(new, a->elts, size); | |
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82 a->elts = new; |
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83 a->nalloc *= 2; |
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84 } |
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85 } |
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86 |
| 485 | 87 elt = (u_char *) a->elts + a->size * a->nelts; |
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88 a->nelts++; |
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89 |
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90 return elt; |
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91 } |
| 485 | 92 |
| 93 | |
| 605 | 94 void * |
| 95 ngx_array_push_n(ngx_array_t *a, ngx_uint_t n) | |
| 485 | 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 | |
| 2049 | 110 if ((u_char *) a->elts + a->size * a->nalloc == p->d.last |
| 111 && p->d.last + size <= p->d.end) | |
| 485 | 112 { |
| 113 /* | |
| 114 * the array allocation is the last in the pool | |
| 115 * and there is space for new allocation | |
| 116 */ | |
| 117 | |
| 2049 | 118 p->d.last += size; |
| 485 | 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 } |