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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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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size)
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12 {
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13 ngx_buf_t *b;
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14
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15 if (!(b = ngx_calloc_buf(pool))) {
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16 return NULL;
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17 }
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18
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19 if (!(b->start = ngx_palloc(pool, size))) {
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20 return NULL;
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21 }
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22
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23 b->pos = b->start;
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24 b->last = b->start;
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25 b->end = b->last + size;
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26 b->temporary = 1;
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27
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28 /*
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29
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30 b->file_pos = 0;
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31 b->file_last = 0;
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32
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33 b->file = NULL;
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34 b->shadow = NULL;
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35
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36 b->tag = 0;
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37
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38 */
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39
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40 return b;
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41 }
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42
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43
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44 ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs)
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45 {
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46 u_char *p;
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47 ngx_int_t i;
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48 ngx_buf_t *b;
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49 ngx_chain_t *chain, *cl, **ll;
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50
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51 if (!(p = ngx_palloc(pool, bufs->num * bufs->size))) {
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52 return NULL;
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53 }
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54
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55 ll = &chain;
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56
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57 for (i = 0; i < bufs->num; i++) {
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58 if (!(b = ngx_calloc_buf(pool))) {
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59 return NULL;
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60 }
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61
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62 b->pos = p;
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63 b->last = p;
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64 b->temporary = 1;
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65
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66 b->start = p;
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67 p += bufs->size;
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68 b->end = p;
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69
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70 /*
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71 b->file_pos = 0;
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72 b->file_last = 0;
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73
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74 b->file = NULL;
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75 b->shadow = NULL;
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76 b->tag = 0;
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77 */
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78
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79 if (!(cl = ngx_alloc_chain_link(pool))) {
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80 return NULL;
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81 }
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82
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83 cl->buf = b;
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84 *ll = cl;
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85 ll = &cl->next;
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86 }
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87
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88 *ll = NULL;
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89
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90 return chain;
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91 }
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92
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93
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94 ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
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95 ngx_chain_t *in)
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96 {
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97 ngx_chain_t *cl, **ll;
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98
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99 ll = chain;
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100
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101 for (cl = *chain; cl; cl = cl->next) {
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102 ll = &cl->next;
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103 }
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104
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105 while (in) {
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106 ngx_test_null(cl, ngx_alloc_chain_link(pool), NGX_ERROR);
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107
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108 cl->buf = in->buf;
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109 *ll = cl;
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110 ll = &cl->next;
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111 in = in->next;
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112 }
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113
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114 *ll = NULL;
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115
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116 return NGX_OK;
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117 }
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118
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119
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120 void ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
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121 ngx_chain_t **out, ngx_buf_tag_t tag)
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122 {
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123 ngx_chain_t *tl;
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124
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125 if (*busy == NULL) {
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126 *busy = *out;
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127
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128 } else {
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129 for (tl = *busy; /* void */ ; tl = tl->next) {
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130 if (tl->next == NULL) {
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131 tl->next = *out;
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132 break;
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133 }
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134 }
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135 }
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136
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137 *out = NULL;
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138
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139 while (*busy) {
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140 if (ngx_buf_size((*busy)->buf) != 0) {
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141 break;
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142 }
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143
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144 #if (HAVE_WRITE_ZEROCOPY)
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145 if ((*busy)->buf->zerocopy_busy) {
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146 break;
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147 }
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148 #endif
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149
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150 if ((*busy)->buf->tag != tag) {
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151 *busy = (*busy)->next;
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152 continue;
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153 }
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154
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2
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155 (*busy)->buf->pos = (*busy)->buf->start;
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156 (*busy)->buf->last = (*busy)->buf->start;
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0
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157
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158 tl = *busy;
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159 *busy = (*busy)->next;
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160 tl->next = *free;
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161 *free = tl;
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162 }
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163 }
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