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1 | office | 1 | /** |
2 | * @file file_open.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 | * Synopsis: |
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32 | * file_open(string filename, string mode [, map options]) |
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33 | * |
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34 | * Variables: |
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35 | * string is_error - "true" if the file_open object is in error state, "false" |
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36 | * otherwise |
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37 | * |
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38 | * Options: |
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39 | * "read_size" - the maximum number of bytes that can be read by a single |
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40 | * read() call. Must be greater than zero. Greater values may improve |
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41 | * performance, but will increase memory usage. Default: 8192. |
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42 | * |
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43 | * Description: |
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44 | * Opens a file for subsequent reading or writing. The 'mode' argument must |
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45 | * be one of: "r", "w", "a", "r+", "w+", "a+"; it corresponds to the mode string |
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46 | * that will be passed to the fopen() function. |
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47 | * When the file_open() statement goes up, the error state is set depending on |
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48 | * whether opening succeeded or failed. The 'is_error' variable should be used |
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49 | * to check the error state. |
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50 | * If an error occurs afterward within read(), write() or seek(), the error state |
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51 | * is set, and the file_open() statement is toggled down and back up. This way, |
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52 | * the same piece of user code can handle all file errors. |
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53 | * |
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54 | * Synopsis: |
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55 | * file_open::read() |
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56 | * |
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57 | * Variables: |
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58 | * string (empty) - the data which was read, or an empty string if EOF was reached |
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59 | * string not_eof - "false" if EOF was reached, "true" if not |
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60 | * |
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61 | * Description: |
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62 | * Reads data from an opened file. The file must not be in error state. |
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63 | * If reading fails, this statement will never go up, the error state of the |
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64 | * file_open() statement will be set, and the file_open() statement will trigger |
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65 | * backtracking (go down and up). |
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66 | * |
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67 | * Synopsis: |
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68 | * file_open::write(string data) |
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69 | * |
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70 | * Description: |
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71 | * Writes data to an opened file. The file must not be in error state. |
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72 | * If writing fails, this statement will never go up, the error state of the |
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73 | * file_open() statement will be set, and the file_open() statement will trigger |
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74 | * backtracking (go down and up). |
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75 | * |
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76 | * Synopsis: |
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77 | * file_open::seek(string position, string whence) |
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78 | * |
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79 | * Description: |
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80 | * Sets the file position indicator. The 'position' argument must be a possibly |
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81 | * negative decimal number, and is interpreted relative to 'whence'. Here, 'whence' |
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82 | * may be one of: |
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83 | * - "set", meaning beginning of file, |
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84 | * - "cur", meaning the current position, and |
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85 | * - "end", meaning the end of file. |
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86 | * Errors are handled as in read() and write(). Note that if the position argument |
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87 | * is too small or too large to convert to off_t, this is not a seek error, and only |
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88 | * the seek command will fail. |
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89 | * |
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90 | * Synopsis: |
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91 | * file_open::close() |
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92 | * |
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93 | * Description: |
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94 | * Closes the file. The file must not be in error state. |
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95 | * Errors are handled as handled as in read() and write(), i.e. the process is |
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96 | * backtracked to file_open() with the error state set. |
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97 | * On success, the error state of the file is set (but without backtracking), and |
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98 | * the close() statement goes up . |
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99 | */ |
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100 | |||
101 | #include <stdio.h> |
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102 | #include <stdint.h> |
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103 | #include <limits.h> |
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104 | |||
105 | #include <misc/debug.h> |
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106 | #include <misc/balloc.h> |
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107 | #include <misc/parse_number.h> |
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108 | #include <ncd/extra/NCDBuf.h> |
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109 | |||
110 | #include <ncd/module_common.h> |
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111 | |||
112 | #include <generated/blog_channel_ncd_file_open.h> |
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113 | |||
114 | #define READ_BUF_SIZE 8192 |
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115 | |||
116 | struct open_instance { |
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117 | NCDModuleInst *i; |
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118 | FILE *fh; |
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119 | NCDBufStore store; |
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120 | }; |
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121 | |||
122 | struct read_instance { |
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123 | NCDModuleInst *i; |
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124 | NCDBuf *buf; |
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125 | size_t length; |
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126 | }; |
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127 | |||
128 | static int parse_mode (MemRef mr, char *out) |
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129 | { |
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130 | size_t pos = 0; |
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131 | size_t left = mr.len; |
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132 | |||
133 | if (left == 0) { |
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134 | return 0; |
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135 | } |
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136 | switch (MemRef_At(mr, pos)) { |
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137 | case 'r': |
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138 | case 'w': |
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139 | case 'a': |
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140 | *out++ = MemRef_At(mr, pos); |
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141 | pos++; |
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142 | left--; |
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143 | break; |
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144 | default: |
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145 | return 0; |
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146 | } |
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147 | |||
148 | if (left == 0) { |
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149 | goto finish; |
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150 | } |
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151 | switch (MemRef_At(mr, pos)) { |
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152 | case '+': |
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153 | *out++ = MemRef_At(mr, pos); |
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154 | pos++; |
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155 | left--; |
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156 | break; |
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157 | default: |
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158 | return 0; |
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159 | } |
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160 | |||
161 | if (left == 0) { |
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162 | goto finish; |
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163 | } |
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164 | |||
165 | return 0; |
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166 | |||
167 | finish: |
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168 | *out = '\0'; |
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169 | return 1; |
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170 | } |
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171 | |||
172 | static void trigger_error (struct open_instance *o) |
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173 | { |
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174 | if (o->fh) { |
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175 | // close file |
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176 | if (fclose(o->fh) != 0) { |
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177 | ModuleLog(o->i, BLOG_ERROR, "fclose failed"); |
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178 | } |
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179 | |||
180 | // set no file, indicating error |
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181 | o->fh = NULL; |
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182 | } |
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183 | |||
184 | // go down and up |
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185 | NCDModuleInst_Backend_Down(o->i); |
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186 | NCDModuleInst_Backend_Up(o->i); |
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187 | } |
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188 | |||
189 | static void open_func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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190 | { |
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191 | struct open_instance *o = vo; |
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192 | o->i = i; |
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193 | |||
194 | // check arguments |
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195 | NCDValRef filename_arg; |
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196 | NCDValRef mode_arg; |
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197 | NCDValRef options_arg = NCDVal_NewInvalid(); |
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198 | if (!NCDVal_ListRead(params->args, 2, &filename_arg, &mode_arg) && |
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199 | !NCDVal_ListRead(params->args, 3, &filename_arg, &mode_arg, &options_arg) |
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200 | ) { |
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201 | ModuleLog(o->i, BLOG_ERROR, "wrong arity"); |
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202 | goto fail0; |
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203 | } |
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204 | if (!NCDVal_IsStringNoNulls(filename_arg) || !NCDVal_IsString(mode_arg) || |
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205 | (!NCDVal_IsInvalid(options_arg) && !NCDVal_IsMap(options_arg)) |
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206 | ) { |
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207 | ModuleLog(o->i, BLOG_ERROR, "wrong type"); |
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208 | goto fail0; |
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209 | } |
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210 | |||
211 | // check mode |
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212 | char mode[5]; |
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213 | if (!parse_mode(NCDVal_StringMemRef(mode_arg), mode)) { |
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214 | ModuleLog(o->i, BLOG_ERROR, "wrong mode"); |
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215 | goto fail0; |
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216 | } |
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217 | |||
218 | size_t read_size_opt = READ_BUF_SIZE; |
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219 | |||
220 | // parse options |
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221 | if (!NCDVal_IsInvalid(options_arg)) { |
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222 | int num_recognized = 0; |
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223 | NCDValRef value; |
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224 | |||
225 | if (!NCDVal_IsInvalid(value = NCDVal_MapGetValue(options_arg, "read_size"))) { |
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226 | uintmax_t read_size; |
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227 | if (!ncd_read_uintmax(value, &read_size) || read_size > SIZE_MAX || read_size == 0) { |
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228 | ModuleLog(o->i, BLOG_ERROR, "wrong read_size"); |
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229 | goto fail0; |
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230 | } |
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231 | num_recognized++; |
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232 | read_size_opt = read_size; |
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233 | } |
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234 | |||
235 | if (NCDVal_MapCount(options_arg) > num_recognized) { |
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236 | ModuleLog(o->i, BLOG_ERROR, "unrecognized options present"); |
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237 | goto fail0; |
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238 | } |
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239 | } |
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240 | |||
241 | // init store |
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242 | NCDBufStore_Init(&o->store, read_size_opt); |
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243 | |||
244 | // null terminate filename |
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245 | NCDValNullTermString filename_nts; |
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246 | if (!NCDVal_StringNullTerminate(filename_arg, &filename_nts)) { |
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247 | ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed"); |
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248 | goto fail1; |
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249 | } |
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250 | |||
251 | // open file |
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252 | o->fh = fopen(filename_nts.data, mode); |
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253 | NCDValNullTermString_Free(&filename_nts); |
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254 | if (!o->fh) { |
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255 | ModuleLog(o->i, BLOG_ERROR, "fopen failed"); |
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256 | } |
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257 | |||
258 | // go up |
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259 | NCDModuleInst_Backend_Up(i); |
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260 | return; |
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261 | |||
262 | fail1: |
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263 | NCDBufStore_Free(&o->store); |
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264 | fail0: |
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265 | NCDModuleInst_Backend_DeadError(i); |
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266 | } |
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267 | |||
268 | static void open_func_die (void *vo) |
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269 | { |
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270 | struct open_instance *o = vo; |
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271 | |||
272 | // close file |
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273 | if (o->fh) { |
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274 | if (fclose(o->fh) != 0) { |
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275 | ModuleLog(o->i, BLOG_ERROR, "fclose failed"); |
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276 | } |
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277 | } |
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278 | |||
279 | // free store |
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280 | NCDBufStore_Free(&o->store); |
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281 | |||
282 | NCDModuleInst_Backend_Dead(o->i); |
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283 | } |
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284 | |||
285 | static int open_func_getvar (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out) |
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286 | { |
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287 | struct open_instance *o = vo; |
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288 | |||
289 | if (name == NCD_STRING_IS_ERROR) { |
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290 | *out = ncd_make_boolean(mem, !o->fh); |
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291 | return 1; |
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292 | } |
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293 | |||
294 | return 0; |
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295 | } |
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296 | |||
297 | static void read_func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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298 | { |
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299 | struct read_instance *o = vo; |
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300 | o->i = i; |
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301 | |||
302 | // check arguments |
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303 | if (!NCDVal_ListRead(params->args, 0)) { |
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304 | ModuleLog(o->i, BLOG_ERROR, "wrong arity"); |
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305 | goto fail0; |
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306 | } |
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307 | |||
308 | // get open instance |
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309 | struct open_instance *open_inst = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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310 | |||
311 | // make sure it's not in error |
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312 | if (!open_inst->fh) { |
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313 | ModuleLog(o->i, BLOG_ERROR, "open instance is in error"); |
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314 | goto fail0; |
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315 | } |
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316 | |||
317 | // get buffer |
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318 | o->buf = NCDBufStore_GetBuf(&open_inst->store); |
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319 | if (!o->buf) { |
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320 | ModuleLog(o->i, BLOG_ERROR, "NCDBufStore_GetBuf failed"); |
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321 | goto fail0; |
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322 | } |
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323 | |||
324 | // starting with empty buffer |
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325 | char *data = NCDBuf_Data(o->buf); |
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326 | size_t buf_size = NCDBufStore_BufSize(&open_inst->store); |
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327 | o->length = 0; |
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328 | |||
329 | while (o->length < buf_size) { |
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330 | // read |
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331 | size_t readed = fread(data + o->length, 1, buf_size - o->length, open_inst->fh); |
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332 | if (readed == 0) { |
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333 | break; |
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334 | } |
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335 | ASSERT(readed <= buf_size - o->length) |
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336 | |||
337 | // increment length |
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338 | o->length += readed; |
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339 | } |
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340 | |||
341 | // if we couldn't read anything due to an error, trigger |
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342 | // error in the open instance, and don't go up |
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343 | if (o->length == 0 && !feof(open_inst->fh)) { |
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344 | ModuleLog(o->i, BLOG_ERROR, "fread failed"); |
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345 | trigger_error(open_inst); |
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346 | return; |
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347 | } |
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348 | |||
349 | // go up |
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350 | NCDModuleInst_Backend_Up(i); |
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351 | return; |
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352 | |||
353 | fail0: |
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354 | NCDModuleInst_Backend_DeadError(i); |
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355 | } |
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356 | |||
357 | static void read_func_die (void *vo) |
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358 | { |
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359 | struct read_instance *o = vo; |
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360 | |||
361 | // release buffer |
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362 | BRefTarget_Deref(NCDBuf_RefTarget(o->buf)); |
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363 | |||
364 | NCDModuleInst_Backend_Dead(o->i); |
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365 | } |
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366 | |||
367 | static int read_func_getvar (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out) |
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368 | { |
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369 | struct read_instance *o = vo; |
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370 | |||
371 | if (name == NCD_STRING_EMPTY) { |
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372 | *out = NCDVal_NewExternalString(mem, NCDBuf_Data(o->buf), o->length, NCDBuf_RefTarget(o->buf)); |
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373 | return 1; |
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374 | } |
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375 | |||
376 | if (name == NCD_STRING_NOT_EOF) { |
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377 | *out = ncd_make_boolean(mem, (o->length != 0)); |
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378 | return 1; |
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379 | } |
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380 | |||
381 | return 0; |
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382 | } |
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383 | |||
384 | static void write_func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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385 | { |
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386 | // check arguments |
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387 | NCDValRef data_arg; |
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388 | if (!NCDVal_ListRead(params->args, 1, &data_arg)) { |
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389 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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390 | goto fail0; |
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391 | } |
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392 | if (!NCDVal_IsString(data_arg)) { |
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393 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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394 | goto fail0; |
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395 | } |
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396 | |||
397 | // get open instance |
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398 | struct open_instance *open_inst = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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399 | |||
400 | // make sure it's not in error |
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401 | if (!open_inst->fh) { |
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402 | ModuleLog(i, BLOG_ERROR, "open instance is in error"); |
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403 | goto fail0; |
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404 | } |
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405 | |||
406 | // write all the data |
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407 | MemRef data_mr = NCDVal_StringMemRef(data_arg); |
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408 | size_t pos = 0; |
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409 | while (pos < data_mr.len) { |
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410 | size_t written = fwrite(data_mr.ptr + pos, 1, data_mr.len - pos, open_inst->fh); |
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411 | if (written == 0) { |
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412 | ModuleLog(i, BLOG_ERROR, "fwrite failed"); |
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413 | trigger_error(open_inst); |
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414 | return; |
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415 | } |
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416 | ASSERT(written <= data_mr.len - pos) |
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417 | pos += written; |
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418 | } |
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419 | |||
420 | // go up |
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421 | NCDModuleInst_Backend_Up(i); |
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422 | return; |
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423 | |||
424 | fail0: |
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425 | NCDModuleInst_Backend_DeadError(i); |
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426 | } |
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427 | |||
428 | static void seek_func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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429 | { |
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430 | // check arguments |
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431 | NCDValRef position_arg; |
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432 | NCDValRef whence_arg; |
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433 | if (!NCDVal_ListRead(params->args, 2, &position_arg, &whence_arg)) { |
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434 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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435 | goto fail0; |
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436 | } |
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437 | if (!NCDVal_IsString(position_arg) || !NCDVal_IsString(whence_arg)) { |
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438 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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439 | goto fail0; |
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440 | } |
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441 | |||
442 | // parse position |
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443 | int position_sign; |
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444 | uintmax_t position_mag; |
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445 | if (!parse_signmag_integer(NCDVal_StringMemRef(position_arg), &position_sign, &position_mag)) { |
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446 | ModuleLog(i, BLOG_ERROR, "wrong position"); |
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447 | goto fail0; |
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448 | } |
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449 | |||
450 | // parse whence |
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451 | int whence; |
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452 | if (NCDVal_StringEquals(whence_arg, "set")) { |
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453 | whence = SEEK_SET; |
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454 | } |
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455 | else if (NCDVal_StringEquals(whence_arg, "cur")) { |
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456 | whence = SEEK_CUR; |
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457 | } |
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458 | else if (NCDVal_StringEquals(whence_arg, "end")) { |
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459 | whence = SEEK_END; |
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460 | } |
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461 | else { |
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462 | ModuleLog(i, BLOG_ERROR, "wrong whence"); |
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463 | goto fail0; |
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464 | } |
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465 | |||
466 | // determine min/max values of off_t (non-portable hack) |
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467 | off_t off_t_min = (sizeof(off_t) == 8 ? INT64_MIN : INT32_MIN); |
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468 | off_t off_t_max = (sizeof(off_t) == 8 ? INT64_MAX : INT32_MAX); |
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469 | |||
470 | // compute position as off_t |
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471 | off_t position; |
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472 | if (position_sign < 0 && position_mag > 0) { |
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473 | if (position_mag - 1 > -(off_t_min + 1)) { |
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474 | ModuleLog(i, BLOG_ERROR, "position underflow"); |
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475 | goto fail0; |
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476 | } |
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477 | position = -(off_t)(position_mag - 1) - 1; |
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478 | } else { |
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479 | if (position_mag > off_t_max) { |
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480 | ModuleLog(i, BLOG_ERROR, "position overflow"); |
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481 | goto fail0; |
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482 | } |
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483 | position = position_mag; |
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484 | } |
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485 | |||
486 | // get open instance |
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487 | struct open_instance *open_inst = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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488 | |||
489 | // make sure it's not in error |
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490 | if (!open_inst->fh) { |
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491 | ModuleLog(i, BLOG_ERROR, "open instance is in error"); |
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492 | goto fail0; |
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493 | } |
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494 | |||
495 | // seek |
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496 | if (fseeko(open_inst->fh, position, whence) < 0) { |
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497 | ModuleLog(i, BLOG_ERROR, "fseeko failed"); |
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498 | trigger_error(open_inst); |
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499 | return; |
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500 | } |
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501 | |||
502 | // go up |
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503 | NCDModuleInst_Backend_Up(i); |
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504 | return; |
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505 | |||
506 | fail0: |
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507 | NCDModuleInst_Backend_DeadError(i); |
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508 | } |
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509 | |||
510 | static void close_func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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511 | { |
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512 | // check arguments |
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513 | if (!NCDVal_ListRead(params->args, 0)) { |
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514 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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515 | goto fail0; |
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516 | } |
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517 | |||
518 | // get open instance |
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519 | struct open_instance *open_inst = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user); |
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520 | |||
521 | // make sure it's not in error |
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522 | if (!open_inst->fh) { |
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523 | ModuleLog(i, BLOG_ERROR, "open instance is in error"); |
||
524 | goto fail0; |
||
525 | } |
||
526 | |||
527 | // close |
||
528 | int res = fclose(open_inst->fh); |
||
529 | open_inst->fh = NULL; |
||
530 | if (res != 0) { |
||
531 | ModuleLog(i, BLOG_ERROR, "fclose failed"); |
||
532 | trigger_error(open_inst); |
||
533 | return; |
||
534 | } |
||
535 | |||
536 | // go up |
||
537 | NCDModuleInst_Backend_Up(i); |
||
538 | return; |
||
539 | |||
540 | fail0: |
||
541 | NCDModuleInst_Backend_DeadError(i); |
||
542 | } |
||
543 | |||
544 | static struct NCDModule modules[] = { |
||
545 | { |
||
546 | .type = "file_open", |
||
547 | .func_new2 = open_func_new, |
||
548 | .func_die = open_func_die, |
||
549 | .func_getvar2 = open_func_getvar, |
||
550 | .alloc_size = sizeof(struct open_instance) |
||
551 | }, { |
||
552 | .type = "file_open::read", |
||
553 | .func_new2 = read_func_new, |
||
554 | .func_die = read_func_die, |
||
555 | .func_getvar2 = read_func_getvar, |
||
556 | .alloc_size = sizeof(struct read_instance) |
||
557 | }, { |
||
558 | .type = "file_open::write", |
||
559 | .func_new2 = write_func_new |
||
560 | }, { |
||
561 | .type = "file_open::seek", |
||
562 | .func_new2 = seek_func_new |
||
563 | }, { |
||
564 | .type = "file_open::close", |
||
565 | .func_new2 = close_func_new |
||
566 | }, { |
||
567 | .type = NULL |
||
568 | } |
||
569 | }; |
||
570 | |||
571 | const struct NCDModuleGroup ncdmodule_file_open = { |
||
572 | .modules = modules |
||
573 | }; |