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1 | office | 1 | /** |
2 | * @file var.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Variable module. |
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32 | * |
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33 | * Synopsis: var(value) |
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34 | * Variables: |
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35 | * (empty) - value |
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36 | * |
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37 | * Synopsis: var::set(value) |
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38 | */ |
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39 | |||
40 | #include <stdlib.h> |
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41 | #include <string.h> |
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42 | |||
43 | #include <ncd/module_common.h> |
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44 | |||
45 | #include <generated/blog_channel_ncd_var.h> |
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46 | |||
47 | struct instance { |
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48 | NCDModuleInst *i; |
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49 | NCDValMem mem; |
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50 | NCDValRef value; |
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51 | }; |
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52 | |||
53 | static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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54 | { |
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55 | struct instance *o = vo; |
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56 | o->i = i; |
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57 | |||
58 | // read argument |
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59 | NCDValRef value_arg; |
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60 | if (!NCDVal_ListRead(params->args, 1, &value_arg)) { |
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61 | ModuleLog(o->i, BLOG_ERROR, "wrong arity"); |
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62 | goto fail0; |
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63 | } |
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64 | |||
65 | // init mem |
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66 | NCDValMem_Init(&o->mem, i->params->iparams->string_index); |
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67 | |||
68 | // copy value |
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69 | o->value = NCDVal_NewCopy(&o->mem, value_arg); |
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70 | if (NCDVal_IsInvalid(o->value)) { |
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71 | goto fail1; |
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72 | } |
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73 | |||
74 | // signal up |
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75 | NCDModuleInst_Backend_Up(o->i); |
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76 | return; |
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77 | |||
78 | fail1: |
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79 | NCDValMem_Free(&o->mem); |
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80 | fail0: |
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81 | NCDModuleInst_Backend_DeadError(i); |
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82 | } |
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83 | |||
84 | static void func_die (void *vo) |
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85 | { |
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86 | struct instance *o = vo; |
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87 | |||
88 | // free mem |
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89 | NCDValMem_Free(&o->mem); |
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90 | |||
91 | NCDModuleInst_Backend_Dead(o->i); |
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92 | } |
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93 | |||
94 | static int func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out) |
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95 | { |
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96 | struct instance *o = vo; |
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97 | |||
98 | if (name == NCD_STRING_EMPTY) { |
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99 | *out = NCDVal_NewCopy(mem, o->value); |
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100 | return 1; |
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101 | } |
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102 | |||
103 | return 0; |
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104 | } |
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105 | |||
106 | static void set_func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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107 | { |
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108 | // read arguments |
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109 | NCDValRef value_arg; |
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110 | if (!NCDVal_ListRead(params->args, 1, &value_arg)) { |
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111 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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112 | goto fail0; |
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113 | } |
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114 | |||
115 | // get method object |
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116 | struct instance *mo = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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117 | |||
118 | // allocate new mem |
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119 | NCDValMem mem; |
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120 | NCDValMem_Init(&mem, i->params->iparams->string_index); |
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121 | |||
122 | // copy value |
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123 | NCDValRef copy = NCDVal_NewCopy(&mem, value_arg); |
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124 | if (NCDVal_IsInvalid(copy)) { |
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125 | goto fail1; |
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126 | } |
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127 | |||
128 | // replace value in var |
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129 | NCDValMem_Free(&mo->mem); |
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130 | mo->mem = mem; |
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131 | mo->value = NCDVal_Moved(&mo->mem, copy); |
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132 | |||
133 | // signal up |
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134 | NCDModuleInst_Backend_Up(i); |
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135 | return; |
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136 | |||
137 | fail1: |
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138 | NCDValMem_Free(&mem); |
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139 | fail0: |
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140 | NCDModuleInst_Backend_DeadError(i); |
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141 | } |
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142 | |||
143 | static struct NCDModule modules[] = { |
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144 | { |
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145 | .type = "var", |
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146 | .func_new2 = func_new, |
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147 | .func_die = func_die, |
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148 | .func_getvar2 = func_getvar2, |
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149 | .alloc_size = sizeof(struct instance) |
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150 | }, { |
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151 | .type = "var::set", |
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152 | .func_new2 = set_func_new |
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153 | }, { |
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154 | .type = NULL |
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155 | } |
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156 | }; |
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157 | |||
158 | const struct NCDModuleGroup ncdmodule_var = { |
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159 | .modules = modules |
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160 | }; |