Tue, 26 Nov 2024 21:53:06 +0100
cxBufferFree() now calls cxBufferDestroy()
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2024 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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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 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include "cx/properties.h" |
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30 | |
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31 | #include <assert.h> |
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32 | |
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33 | static const int CX_PROPERTIES_FLAG_USE_STACK = 0x01; |
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34 | |
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35 | const CxPropertiesConfig cx_properties_config_default = { |
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36 | '=', |
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37 | //'\\', |
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38 | '#', |
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39 | '\0', |
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40 | '\0' |
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41 | }; |
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42 | |
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43 | void cxPropertiesInit( |
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44 | CxProperties *prop, |
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45 | CxPropertiesConfig config |
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46 | ) { |
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47 | memset(prop, 0, sizeof(CxProperties)); |
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48 | prop->config = config; |
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49 | } |
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50 | |
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51 | void cxPropertiesDestroy(CxProperties *prop) { |
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52 | if (0 == (prop->flags & CX_PROPERTIES_FLAG_USE_STACK)) { |
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53 | free(prop->buf); |
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54 | } |
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55 | prop->buf = NULL; |
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56 | prop->buf_capacity = prop->buf_size = 0; |
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57 | } |
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58 | |
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59 | static int cx_properties_ensure_buf_capacity(CxProperties *prop, size_t cap) { |
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60 | if (prop->buf_capacity >= cap) { |
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61 | return 0; |
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62 | } |
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63 | |
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64 | // not enough capacity - are we on the stack right now? |
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65 | if ((prop->flags & CX_PROPERTIES_FLAG_USE_STACK) != 0) { |
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66 | // move to the heap |
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67 | char *newbuf = malloc(cap); |
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68 | if (newbuf == NULL) return 1; |
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69 | memcpy(newbuf, prop->buf, prop->buf_size); |
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70 | prop->buf = newbuf; |
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71 | prop->flags &= CX_PROPERTIES_FLAG_USE_STACK; |
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72 | } else { |
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73 | // we are on the heap already, reallocate |
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74 | // this is legit, because realloc() behaves like malloc() when the |
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75 | // current pointer is NULL |
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76 | char *newbuf = realloc(prop->buf, cap); |
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77 | if (newbuf == NULL) return 1; |
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78 | prop->buf = newbuf; |
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79 | } |
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80 | |
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81 | // store new capacity and return |
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82 | prop->buf_capacity = cap; |
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83 | return 0; |
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84 | } |
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85 | |
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86 | static int cx_properties_rescuen_input(CxProperties *prop, size_t len) { |
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87 | if (cx_properties_ensure_buf_capacity(prop, prop->buf_size + len)) { |
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88 | return 1; |
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89 | } |
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90 | const char *src = prop->text + prop->text_pos; |
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91 | char *dest = prop->buf + prop->buf_size; |
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92 | memcpy(dest, src, len); |
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93 | prop->buf_size += len; |
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94 | prop->text_pos += len; |
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95 | return 0; |
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96 | } |
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97 | |
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98 | static int cx_properties_rescue_input(CxProperties *prop) { |
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99 | // someone fucked around with our integers, exit immediately |
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100 | if (prop->text_pos > prop->text_size) return 0; |
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101 | |
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102 | // determine the bytes needed |
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103 | size_t len = prop->text_size - prop->text_pos; |
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104 | |
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105 | return cx_properties_rescuen_input(prop, len); |
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106 | } |
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107 | |
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108 | int cxPropertiesFilln( |
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109 | CxProperties *prop, |
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110 | const char *buf, |
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111 | size_t len |
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112 | ) { |
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113 | if (cx_properties_rescue_input(prop)) return 1; |
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114 | prop->text = buf; |
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115 | prop->text_size = len; |
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116 | prop->text_pos = 0; |
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117 | return 0; |
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118 | } |
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119 | |
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120 | void cxPropertiesUseStack( |
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121 | CxProperties *prop, |
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122 | char *buf, |
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123 | size_t capacity |
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124 | ) { |
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125 | assert(prop->buf == NULL); |
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126 | prop->buf = buf; |
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127 | prop->buf_capacity = capacity; |
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128 | prop->buf_size = 0; |
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129 | prop->flags |= CX_PROPERTIES_FLAG_USE_STACK; |
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130 | } |
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131 | |
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132 | CxPropertiesStatus cxPropertiesNext( |
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133 | CxProperties *prop, |
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134 | cxstring *key, |
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135 | cxstring *value |
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136 | ) { |
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137 | // check if we have a text buffer |
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138 | if (prop->text == NULL) { |
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139 | return CX_PROPERTIES_NULL_INPUT; |
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140 | } |
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141 | // check if we have rescued data |
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142 | if (prop->buf_size > 0) { |
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143 | // check if we can now get a complete line |
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144 | const char *buf = prop->text + prop->text_pos; |
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145 | size_t len = prop->text_size - prop->text_pos; |
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146 | cxstring str = cx_strn(buf, len); |
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147 | cxstring nl = cx_strchr(str, '\n'); |
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148 | if(nl.length > 0) { |
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149 | // we add as much data to the rescue buffer as we need |
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150 | // to complete the line |
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151 | size_t len_until_nl = (size_t)(nl.ptr - buf) + 1; |
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152 | |
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153 | if (cx_properties_rescuen_input(prop, len_until_nl)) { |
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154 | return CX_PROPERTIES_BUFFER_ALLOC_FAILED; |
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155 | } |
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156 | |
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157 | // the tmp buffer contains exactly one line now |
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158 | // we use a trick here: we swap the buffers and recurse |
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159 | const char *orig_text = prop->text; |
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160 | size_t orig_size = prop->text_size; |
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161 | prop->text = prop->buf; |
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162 | prop->text_size = prop->buf_size; |
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163 | prop->text_pos = 0; |
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164 | prop->buf_size = 0; |
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165 | |
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166 | CxPropertiesStatus result; |
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167 | result = cxPropertiesNext(prop, key, value); |
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168 | |
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169 | // restore original buffer |
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170 | prop->text = orig_text; |
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171 | prop->text_size = orig_size; |
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172 | |
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173 | // set the position to after the newline |
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174 | prop->text_pos = len_until_nl; |
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175 | |
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176 | // check the result |
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177 | if (result == CX_PROPERTIES_NO_ERROR) { |
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178 | // reset the rescue buffer and return with the result |
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179 | prop->buf_size = 0; |
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180 | return result; |
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181 | } else if (result == CX_PROPERTIES_NO_DATA) { |
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182 | // rescue buffer contained only blanks or comments |
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183 | // reset the rescue buffer and retry with text buffer |
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184 | prop->buf_size = 0; |
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185 | return cxPropertiesNext(prop, key, value); |
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186 | } else { |
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187 | // CX_PROPERTIES_INCOMPLETE_DATA is not possible |
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188 | // so it must have been another error |
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189 | // do not reset the rescue buffer and return the error |
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190 | return result; |
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191 | } |
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192 | } else { |
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193 | // still not enough data |
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194 | if (cx_properties_rescue_input(prop)) { |
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195 | return CX_PROPERTIES_BUFFER_ALLOC_FAILED; |
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196 | } |
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197 | return CX_PROPERTIES_INCOMPLETE_DATA; |
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198 | } |
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199 | } |
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200 | |
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201 | char comment1 = prop->config.comment1; |
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202 | char comment2 = prop->config.comment2; |
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203 | char comment3 = prop->config.comment3; |
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204 | char delimiter = prop->config.delimiter; |
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205 | |
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206 | // get one line and parse it |
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207 | while (prop->text_pos < prop->text_size) { |
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208 | const char *buf = prop->text + prop->text_pos; |
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209 | size_t len = prop->text_size - prop->text_pos; |
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210 | |
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211 | /* |
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212 | * First we check if we have at least one line. We also get indices of |
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213 | * delimiter and comment chars |
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214 | */ |
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215 | size_t delimiter_index = 0; |
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216 | size_t comment_index = 0; |
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217 | bool has_comment = false; |
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218 | |
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219 | size_t i = 0; |
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220 | char c = 0; |
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221 | for (; i < len; i++) { |
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222 | c = buf[i]; |
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223 | if (c == comment1 || c == comment2 || c == comment3) { |
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224 | if (comment_index == 0) { |
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225 | comment_index = i; |
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226 | has_comment = true; |
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227 | } |
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228 | } else if (c == delimiter) { |
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229 | if (delimiter_index == 0 && !has_comment) { |
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230 | delimiter_index = i; |
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231 | } |
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232 | } else if (c == '\n') { |
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233 | break; |
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234 | } |
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235 | } |
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236 | |
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237 | if (c != '\n') { |
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238 | // we don't have enough data for a line |
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239 | if (cx_properties_rescue_input(prop)) { |
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240 | return CX_PROPERTIES_BUFFER_ALLOC_FAILED; |
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241 | } |
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242 | return CX_PROPERTIES_INCOMPLETE_DATA; |
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243 | } |
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244 | |
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245 | cxstring line = has_comment ? |
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246 | cx_strn(buf, comment_index) : |
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247 | cx_strn(buf, i); |
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248 | // check line |
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249 | if (delimiter_index == 0) { |
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250 | // if line is not blank ... |
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251 | line = cx_strtrim(line); |
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252 | // ... either no delimiter found, or key is empty |
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253 | if (line.length > 0) { |
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254 | if (line.ptr[0] == delimiter) { |
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255 | return CX_PROPERTIES_INVALID_EMPTY_KEY; |
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256 | } else { |
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257 | return CX_PROPERTIES_INVALID_MISSING_DELIMITER; |
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258 | } |
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259 | } |
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260 | } else { |
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261 | cxstring k = cx_strn(buf, delimiter_index); |
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262 | cxstring val = cx_strn( |
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263 | buf + delimiter_index + 1, |
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264 | line.length - delimiter_index - 1); |
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265 | k = cx_strtrim(k); |
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266 | val = cx_strtrim(val); |
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267 | if (k.length > 0) { |
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268 | *key = k; |
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269 | *value = val; |
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270 | prop->text_pos += i + 1; |
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271 | assert(prop->text_pos <= prop->text_size); |
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272 | return CX_PROPERTIES_NO_ERROR; |
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273 | } else { |
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274 | return CX_PROPERTIES_INVALID_EMPTY_KEY; |
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275 | } |
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276 | } |
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277 | |
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278 | prop->text_pos += i + 1; |
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279 | } |
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280 | |
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281 | // when we come to this point, all data must have been read |
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282 | assert(prop->text_pos == prop->text_size); |
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283 | return CX_PROPERTIES_NO_DATA; |
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284 | } |
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285 | |
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286 | static int cx_properties_sink_map( |
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287 | cx_attr_unused CxProperties *prop, |
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288 | CxPropertiesSink *sink, |
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289 | cxstring key, |
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290 | cxstring value |
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291 | ) { |
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292 | CxMap *map = sink->sink; |
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293 | CxAllocator *alloc = sink->data; |
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294 | cxmutstr v = cx_strdup_a(alloc, value); |
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295 | int r = cx_map_put_cxstr(map, key, v.ptr); |
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296 | if (r != 0) cx_strfree_a(alloc, &v); |
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297 | return r; |
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298 | } |
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299 | |
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300 | CxPropertiesSink cxPropertiesMapSink(CxMap *map) { |
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301 | CxPropertiesSink sink; |
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302 | sink.sink = map; |
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303 | sink.data = cxDefaultAllocator; |
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304 | sink.sink_func = cx_properties_sink_map; |
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305 | return sink; |
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306 | } |
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307 | |
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308 | static int cx_properties_read_string( |
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309 | CxProperties *prop, |
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310 | CxPropertiesSource *src, |
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311 | cxstring *target |
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312 | ) { |
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313 | if (prop->text == src->src) { |
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314 | // when the input buffer already contains the string |
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315 | // we have nothing more to provide |
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316 | target->length = 0; |
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317 | } else { |
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318 | target->ptr = src->src; |
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319 | target->length = src->data_size; |
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320 | } |
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321 | return 0; |
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322 | } |
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323 | |
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324 | static int cx_properties_read_file( |
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325 | cx_attr_unused CxProperties *prop, |
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326 | CxPropertiesSource *src, |
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327 | cxstring *target |
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328 | ) { |
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329 | target->ptr = src->data_ptr; |
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330 | target->length = fread(src->data_ptr, 1, src->data_size, src->src); |
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331 | return ferror(src->src); |
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332 | } |
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333 | |
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334 | static int cx_properties_read_init_file( |
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335 | cx_attr_unused CxProperties *prop, |
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336 | CxPropertiesSource *src |
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337 | ) { |
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338 | src->data_ptr = malloc(src->data_size); |
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339 | if (src->data_ptr == NULL) return 1; |
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340 | return 0; |
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341 | } |
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342 | |
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343 | static void cx_properties_read_clean_file( |
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344 | cx_attr_unused CxProperties *prop, |
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345 | CxPropertiesSource *src |
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346 | ) { |
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347 | free(src->data_ptr); |
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348 | } |
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349 | |
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350 | CxPropertiesSource cxPropertiesStringSource(cxstring str) { |
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351 | CxPropertiesSource src; |
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352 | src.src = (void*) str.ptr; |
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353 | src.data_size = str.length; |
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354 | src.read_func = cx_properties_read_string; |
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355 | src.read_init_func = NULL; |
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356 | src.read_clean_func = NULL; |
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357 | return src; |
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358 | } |
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359 | |
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360 | CxPropertiesSource cxPropertiesCstrnSource(const char *str, size_t len) { |
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361 | CxPropertiesSource src; |
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362 | src.src = (void*) str; |
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363 | src.data_size = len; |
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364 | src.read_func = cx_properties_read_string; |
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365 | src.read_init_func = NULL; |
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366 | src.read_clean_func = NULL; |
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367 | return src; |
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368 | } |
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369 | |
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370 | CxPropertiesSource cxPropertiesCstrSource(const char *str) { |
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371 | CxPropertiesSource src; |
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372 | src.src = (void*) str; |
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373 | src.data_size = strlen(str); |
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374 | src.read_func = cx_properties_read_string; |
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375 | src.read_init_func = NULL; |
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376 | src.read_clean_func = NULL; |
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377 | return src; |
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378 | } |
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379 | |
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380 | CxPropertiesSource cxPropertiesFileSource(FILE *file, size_t chunk_size) { |
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381 | CxPropertiesSource src; |
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382 | src.src = file; |
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383 | src.data_size = chunk_size; |
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384 | src.read_func = cx_properties_read_file; |
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385 | src.read_init_func = cx_properties_read_init_file; |
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386 | src.read_clean_func = cx_properties_read_clean_file; |
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387 | return src; |
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388 | } |
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389 | |
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390 | CxPropertiesStatus cxPropertiesLoad( |
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391 | CxProperties *prop, |
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392 | CxPropertiesSink sink, |
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393 | CxPropertiesSource source |
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394 | ) { |
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395 | assert(source.read_func != NULL); |
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396 | assert(sink.sink_func != NULL); |
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397 | |
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398 | // initialize reader |
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399 | if (source.read_init_func != NULL) { |
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400 | if (source.read_init_func(prop, &source)) { |
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401 | return CX_PROPERTIES_READ_INIT_FAILED; |
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402 | } |
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403 | } |
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404 | |
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405 | // transfer the data from the source to the sink |
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406 | CxPropertiesStatus status; |
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407 | bool found = false; |
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408 | while (true) { |
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409 | // read input |
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410 | cxstring input; |
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411 | if (source.read_func(prop, &source, &input)) { |
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412 | status = CX_PROPERTIES_READ_FAILED; |
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413 | break; |
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414 | } |
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415 | |
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416 | // no more data - break |
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417 | if (input.length == 0) { |
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418 | status = found ? CX_PROPERTIES_NO_ERROR : CX_PROPERTIES_NO_DATA; |
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419 | break; |
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420 | } |
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421 | |
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422 | // set the input buffer and read the k/v-pairs |
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423 | prop->text = input.ptr; |
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424 | prop->text_size = input.length; |
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425 | prop->text_pos = 0; |
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426 | |
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427 | CxPropertiesStatus kv_status; |
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428 | do { |
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429 | cxstring key, value; |
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430 | kv_status = cxPropertiesNext(prop, &key, &value); |
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431 | if (kv_status == CX_PROPERTIES_NO_ERROR) { |
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432 | found = true; |
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433 | if (sink.sink_func(prop, &sink, key, value)) { |
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434 | kv_status = CX_PROPERTIES_SINK_FAILED; |
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435 | } |
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436 | } |
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437 | } while (kv_status == CX_PROPERTIES_NO_ERROR); |
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438 | |
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439 | if (kv_status > CX_PROPERTIES_OK) { |
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440 | status = kv_status; |
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441 | break; |
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442 | } |
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443 | } |
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444 | |
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445 | if (source.read_clean_func != NULL) { |
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446 | source.read_clean_func(prop, &source); |
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447 | } |
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448 | |
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449 | return status; |
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450 | } |