Mercurial > hg > nginx-quic
annotate src/core/ngx_array.c @ 4:c5f071d376e5
nginx-0.0.1-2002-08-22-19:24:03 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Thu, 22 Aug 2002 15:24:03 +0000 |
parents | 4eff17414a43 |
children | 0e81ac0bb3e2 |
rev | line source |
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nginx-0.0.1-2002-08-06-20:39:45 import
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1 |
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2 #include <ngx_config.h> |
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4 #include <ngx_alloc.h> |
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5 #include <ngx_array.h> |
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6 |
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7 ngx_array_t *ngx_create_array(ngx_pool_t *p, int n, size_t size) |
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8 { |
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9 ngx_array_t *a; |
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10 |
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11 a = ngx_palloc(p, sizeof(ngx_array_t)); |
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12 if (a == NULL) |
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13 return NULL; |
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14 |
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15 a->elts = ngx_palloc(p, n * size); |
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16 if (a->elts == NULL) |
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17 return NULL; |
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18 |
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19 a->pool = p; |
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20 a->nelts = 0; |
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21 a->nalloc = n; |
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22 a->size = size; |
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23 |
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24 return a; |
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25 } |
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26 |
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27 void ngx_destroy_array(ngx_array_t *a) |
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28 { |
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29 ngx_pool_t *p = a->pool; |
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30 |
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31 if (a->elts + a->size * a->nalloc == p->last) |
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32 p->last -= a->size * a->nalloc; |
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33 |
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34 if ((char *) a + sizeof(ngx_array_t) == p->last) |
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35 p->last = (char *) a; |
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36 } |
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37 |
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38 void *ngx_push_array(ngx_array_t *a) |
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39 { |
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40 void *elt; |
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41 |
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42 /* array is full */ |
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43 if (a->nelts == a->nalloc) { |
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44 ngx_pool_t *p = a->pool; |
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45 |
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46 /* array allocation is the last in the pool */ |
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47 if (a->elts + a->size * a->nelts == p->last |
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48 && (unsigned) (p->end - p->last) >= a->size) |
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49 { |
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50 p->last += a->size; |
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51 a->nalloc++; |
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52 |
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53 /* allocate new array */ |
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54 } else { |
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55 void *new = ngx_palloc(p, 2 * a->nalloc * a->size); |
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56 if (new == NULL) |
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57 return NULL; |
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58 |
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59 memcpy(new, a->elts, a->nalloc * a->size); |
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60 a->elts = new; |
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61 a->nalloc *= 2; |
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62 } |
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63 } |
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64 |
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65 elt = a->elts + a->size * a->nelts; |
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66 a->nelts++; |
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67 |
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68 return elt; |
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69 } |