Mercurial > hg > nginx
annotate src/core/ngx_parse.c @ 6009:15a15f6ae3a2
Core: overflow detection in number parsing functions.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 17 Mar 2015 00:26:15 +0300 |
parents | d620f497c50f |
children | 040e2736e8dc |
rev | line source |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 |
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11 |
563 | 12 ssize_t |
13 ngx_parse_size(ngx_str_t *line) | |
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14 { |
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15 u_char unit; |
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16 size_t len; |
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17 ssize_t size, scale, max; |
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18 |
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19 len = line->len; |
1971 | 20 unit = line->data[len - 1]; |
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21 |
1971 | 22 switch (unit) { |
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23 case 'K': |
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24 case 'k': |
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25 len--; |
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26 max = NGX_MAX_SIZE_T_VALUE / 1024; |
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27 scale = 1024; |
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28 break; |
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29 |
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30 case 'M': |
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31 case 'm': |
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32 len--; |
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33 max = NGX_MAX_SIZE_T_VALUE / (1024 * 1024); |
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34 scale = 1024 * 1024; |
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35 break; |
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36 |
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37 default: |
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38 max = NGX_MAX_SIZE_T_VALUE; |
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39 scale = 1; |
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40 } |
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41 |
563 | 42 size = ngx_atosz(line->data, len); |
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43 if (size == NGX_ERROR || size > max) { |
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44 return NGX_ERROR; |
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45 } |
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46 |
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47 size *= scale; |
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48 |
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49 return size; |
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50 } |
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51 |
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52 |
663 | 53 off_t |
54 ngx_parse_offset(ngx_str_t *line) | |
55 { | |
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56 u_char unit; |
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57 off_t offset, scale, max; |
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58 size_t len; |
663 | 59 |
60 len = line->len; | |
1971 | 61 unit = line->data[len - 1]; |
663 | 62 |
1971 | 63 switch (unit) { |
663 | 64 case 'K': |
65 case 'k': | |
66 len--; | |
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67 max = NGX_MAX_OFF_T_VALUE / 1024; |
663 | 68 scale = 1024; |
69 break; | |
70 | |
71 case 'M': | |
72 case 'm': | |
73 len--; | |
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74 max = NGX_MAX_OFF_T_VALUE / (1024 * 1024); |
663 | 75 scale = 1024 * 1024; |
76 break; | |
77 | |
78 case 'G': | |
79 case 'g': | |
80 len--; | |
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81 max = NGX_MAX_OFF_T_VALUE / (1024 * 1024 * 1024); |
663 | 82 scale = 1024 * 1024 * 1024; |
83 break; | |
84 | |
85 default: | |
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86 max = NGX_MAX_OFF_T_VALUE; |
663 | 87 scale = 1; |
88 } | |
89 | |
90 offset = ngx_atoof(line->data, len); | |
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91 if (offset == NGX_ERROR || offset > max) { |
663 | 92 return NGX_ERROR; |
93 } | |
94 | |
95 offset *= scale; | |
96 | |
97 return offset; | |
98 } | |
99 | |
100 | |
563 | 101 ngx_int_t |
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102 ngx_parse_time(ngx_str_t *line, ngx_uint_t is_sec) |
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103 { |
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104 u_char *p, *last; |
651 | 105 ngx_int_t value, total, scale; |
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106 ngx_uint_t max, valid; |
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107 enum { |
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108 st_start = 0, |
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109 st_year, |
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110 st_month, |
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111 st_week, |
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112 st_day, |
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113 st_hour, |
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114 st_min, |
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115 st_sec, |
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116 st_msec, |
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117 st_last |
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118 } step; |
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119 |
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120 valid = 0; |
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121 value = 0; |
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122 total = 0; |
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123 step = is_sec ? st_start : st_month; |
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124 scale = is_sec ? 1 : 1000; |
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125 |
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126 p = line->data; |
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127 last = p + line->len; |
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128 |
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129 while (p < last) { |
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130 |
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131 if (*p >= '0' && *p <= '9') { |
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132 value = value * 10 + (*p++ - '0'); |
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133 valid = 1; |
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134 continue; |
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135 } |
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136 |
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137 switch (*p++) { |
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138 |
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139 case 'y': |
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140 if (step > st_start) { |
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141 return NGX_ERROR; |
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142 } |
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143 step = st_year; |
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144 max = NGX_MAX_INT32_VALUE / (60 * 60 * 24 * 365); |
157
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145 scale = 60 * 60 * 24 * 365; |
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146 break; |
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147 |
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148 case 'M': |
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149 if (step >= st_month) { |
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150 return NGX_ERROR; |
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151 } |
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152 step = st_month; |
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153 max = NGX_MAX_INT32_VALUE / (60 * 60 * 24 * 30); |
157
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nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
154 scale = 60 * 60 * 24 * 30; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
155 break; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
156 |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
157 case 'w': |
4183
c352c483263c
Improved ngx_parse_time() code readability.
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parents:
1972
diff
changeset
|
158 if (step >= st_week) { |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
159 return NGX_ERROR; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
160 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
161 step = st_week; |
4183
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Improved ngx_parse_time() code readability.
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parents:
1972
diff
changeset
|
162 max = NGX_MAX_INT32_VALUE / (60 * 60 * 24 * 7); |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
163 scale = 60 * 60 * 24 * 7; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
164 break; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
165 |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
166 case 'd': |
4183
c352c483263c
Improved ngx_parse_time() code readability.
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parents:
1972
diff
changeset
|
167 if (step >= st_day) { |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
168 return NGX_ERROR; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
169 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
170 step = st_day; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
171 max = NGX_MAX_INT32_VALUE / (60 * 60 * 24); |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
172 scale = 60 * 60 * 24; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
173 break; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
174 |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
175 case 'h': |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
176 if (step >= st_hour) { |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
177 return NGX_ERROR; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
178 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
179 step = st_hour; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
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parents:
1972
diff
changeset
|
180 max = NGX_MAX_INT32_VALUE / (60 * 60); |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
181 scale = 60 * 60; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
182 break; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
183 |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
184 case 'm': |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
185 if (*p == 's') { |
4183
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Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
186 if (is_sec || step >= st_msec) { |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
187 return NGX_ERROR; |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
188 } |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
189 p++; |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
190 step = st_msec; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
191 max = NGX_MAX_INT32_VALUE; |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
192 scale = 1; |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
193 break; |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
194 } |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
195 |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
196 if (step >= st_min) { |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
197 return NGX_ERROR; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
198 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
199 step = st_min; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
200 max = NGX_MAX_INT32_VALUE / 60; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
201 scale = 60; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
202 break; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
203 |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
204 case 's': |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
205 if (step >= st_sec) { |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
206 return NGX_ERROR; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
207 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
208 step = st_sec; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
209 max = NGX_MAX_INT32_VALUE; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
210 scale = 1; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
211 break; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
212 |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
213 case ' ': |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
214 if (step >= st_sec) { |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
215 return NGX_ERROR; |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
216 } |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
217 step = st_last; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
218 max = NGX_MAX_INT32_VALUE; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
219 scale = 1; |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
220 break; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
221 |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
222 default: |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
223 return NGX_ERROR; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
224 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
225 |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
226 if (step != st_msec && !is_sec) { |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
227 scale *= 1000; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
228 max /= 1000; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
229 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
230 |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
231 if ((ngx_uint_t) value > max) { |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
232 return NGX_ERROR; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
233 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
234 |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
235 total += value * scale; |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
236 |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
237 if ((ngx_uint_t) total > NGX_MAX_INT32_VALUE) { |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
238 return NGX_ERROR; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
239 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
240 |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
241 value = 0; |
4183
c352c483263c
Improved ngx_parse_time() code readability.
Ruslan Ermilov <ru@nginx.com>
parents:
1972
diff
changeset
|
242 scale = is_sec ? 1 : 1000; |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
243 |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
244 while (p < last && *p == ' ') { |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
245 p++; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
246 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
247 } |
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
248 |
1972
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
249 if (valid) { |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
250 return total + value * scale; |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
251 } |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
252 |
9d2bdbda4ee3
allow time without spaces in ngx_parse_time()
Igor Sysoev <igor@sysoev.ru>
parents:
1971
diff
changeset
|
253 return NGX_ERROR; |
157
70b36c805682
nginx-0.0.1-2003-10-23-19:54:19 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
254 } |