1 | #define MODULE_LOG_PREFIX "files"
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2 |
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3 | #include "globals.h"
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4 |
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5 | #include "oscam-files.h"
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6 | #include "oscam-lock.h"
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7 | #include "oscam-string.h"
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8 |
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9 | extern CS_MUTEX_LOCK readdir_lock;
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10 | extern char cs_tmpdir[200];
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11 |
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12 | /* Gets the tmp dir */
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13 | char *get_tmp_dir(void)
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14 | {
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15 | if(cs_tmpdir[0])
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16 | {
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17 | return cs_tmpdir;
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18 | }
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19 | #if defined(__CYGWIN__)
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20 |
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21 | char *d = getenv("TMPDIR");
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22 |
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23 | if(!d || !d[0])
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24 | {
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25 | d = getenv("TMP");
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26 | }
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27 |
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28 | if(!d || !d[0])
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29 | {
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30 | d = getenv("TEMP");
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31 | }
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32 |
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33 | if(!d || !d[0])
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34 | {
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35 | getcwd(cs_tmpdir, sizeof(cs_tmpdir) - 1);
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36 | }
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37 |
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38 | cs_strncpy(cs_tmpdir, d, sizeof(cs_tmpdir));
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39 | char *p = cs_tmpdir;
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40 | while(*p) { p++; }
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41 | p--;
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42 | if(*p != '/' && *p != '\\')
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43 | {
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44 | cs_strncat(cs_tmpdir, "/", sizeof(cs_tmpdir));
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45 | }
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46 | cs_strncat(cs_tmpdir, "_oscam", sizeof(cs_tmpdir));
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47 | #else
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48 | cs_strncpy(cs_tmpdir, "/tmp/.oscam", sizeof(cs_tmpdir));
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49 | #endif
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50 | mkdir(cs_tmpdir, S_IRWXU);
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51 | return cs_tmpdir;
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52 | }
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53 |
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54 | char *get_tmp_dir_filename(char *dest, size_t destlen, const char *filename)
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55 | {
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56 | char *tmp_dir = get_tmp_dir();
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57 | const char *slash = "/";
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58 | if(tmp_dir[cs_strlen(tmp_dir) - 1] == '/')
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59 | {
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60 | slash = "";
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61 | }
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62 | snprintf(dest, destlen, "%s%s%s", tmp_dir, slash, filename);
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63 | return dest;
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64 | }
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65 |
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66 | /* Drop-in replacement for readdir_r as some plattforms strip the function from their libc.
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67 | Furthermore, there are some security issues, see http://womble.decadent.org.uk/readdir_r-advisory.html */
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68 |
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69 | int32_t cs_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
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70 | {
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71 | /* According to POSIX the buffer readdir uses is not shared between directory streams.
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72 | However readdir is not guaranteed to be thread-safe and some implementations may use global state.
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73 | Thus we use a lock as we have many plattforms... */
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74 |
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75 | int32_t rc;
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76 | cs_writelock(__func__, &readdir_lock);
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77 | errno = 0;
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78 | *result = readdir(dirp);
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79 | rc = errno;
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80 | if(errno == 0 && *result != NULL)
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81 | {
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82 | memcpy(entry, *result, sizeof(struct dirent));
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83 | *result = entry;
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84 | }
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85 | cs_writeunlock(__func__, &readdir_lock);
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86 | return rc;
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87 | }
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88 |
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89 | /* Return 1 if the file exists, else 0 */
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90 | bool file_exists(const char *filename)
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91 | {
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92 | return access(filename, R_OK) == 0;
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93 | }
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94 |
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95 | /* Copies a file from srcfile to destfile. If an error occured before writing,
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96 | -1 is returned, else -2. On success, 0 is returned.*/
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97 |
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98 | int32_t file_copy(char *srcfile, char *destfile)
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99 | {
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100 | FILE *src, *dest;
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101 | int32_t ch;
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102 |
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103 | src = fopen(srcfile, "r");
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104 | if(!src)
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105 | {
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106 | cs_log("Error opening file %s for reading (errno=%d %s)!", srcfile, errno, strerror(errno));
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107 | return -1;
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108 | }
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109 |
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110 | dest = fopen(destfile, "w");
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111 | if(!dest)
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112 | {
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113 | cs_log("Error opening file %s for writing (errno=%d %s)!", destfile, errno, strerror(errno));
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114 | fclose(src);
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115 | return -1;
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116 | }
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117 |
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118 | while(1)
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119 | {
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120 | ch = fgetc(src);
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121 | if(ch == EOF)
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122 | {
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123 | break;
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124 | }
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125 | else
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126 | {
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127 | fputc(ch, dest);
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128 | if(ferror(dest))
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129 | {
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130 | cs_log("Error while writing to file %s (errno=%d %s)!", destfile, errno, strerror(errno));
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131 | fclose(src);
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132 | fclose(dest);
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133 | return -2;
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134 | }
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135 | }
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136 | }
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137 | fclose(src);
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138 | fclose(dest);
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139 | return (0);
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140 | }
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141 |
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142 | /* Overwrites destfile with temp_file. If forceBakOverWrite = 0,
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143 | the bakfile will not be overwritten if it exists, else it will be.*/
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144 |
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145 | int32_t safe_overwrite_with_bak(char *destfile, char *temp_file, char *bakfile, int32_t forceBakOverWrite)
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146 | {
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147 | int32_t rc;
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148 | if(file_exists(destfile))
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149 | {
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150 | if(forceBakOverWrite != 0 || !file_exists(bakfile))
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151 | {
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152 | if(file_copy(destfile, bakfile) < 0)
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153 | {
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154 | cs_log("Error copying original config file %s to %s. The original config will be left untouched!", destfile, bakfile);
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155 | if(unlink(temp_file) < 0)
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156 | {
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157 | cs_log("Error removing temp config file %s (errno=%d %s)!", temp_file, errno, strerror(errno));
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158 | }
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159 | return 1;
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160 | }
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161 | }
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162 | }
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163 |
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164 | rc = file_copy(temp_file, destfile);
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165 | if(rc < 0)
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166 | {
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167 | cs_log("An error occured while writing the new config file %s.", destfile);
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168 | if(rc == -2)
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169 | {
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170 | cs_log("The config will be missing or only partly filled upon next startup as this is a non-recoverable error! Please restore from backup or try again.");
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171 | }
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172 | if(unlink(temp_file) < 0)
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173 | {
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174 | cs_log("Error removing temp config file %s (errno=%d %s)!", temp_file, errno, strerror(errno));
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175 | }
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176 | return 1;
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177 | }
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178 |
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179 | if(unlink(temp_file) < 0)
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180 | {
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181 | cs_log("Error removing temp config file %s (errno=%d %s)!", temp_file, errno, strerror(errno));
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182 | }
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183 | return 0;
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184 | }
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185 |
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186 | #ifdef MODULE_GBOX
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187 | char *get_gbox_filename(char *dest, size_t destlen, const char *filename)
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188 | {
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189 | char *tmp_dir = get_tmp_dir();
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190 | const char *slash = "/";
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191 |
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192 | if(cfg.gbox_tmp_dir != NULL)
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193 | {
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194 | if(cfg.gbox_tmp_dir[cs_strlen(cfg.gbox_tmp_dir) - 1] == '/')
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195 | {
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196 | slash = "";
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197 | }
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198 | snprintf(dest, destlen, "%s%s%s", cfg.gbox_tmp_dir, slash, filename);
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199 | }
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200 | else
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201 | {
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202 | if(tmp_dir[cs_strlen(tmp_dir) - 1] == '/') { slash = ""; }
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203 | snprintf(dest, destlen, "%s%s%s", tmp_dir, slash, filename);
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204 | }
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205 | return dest;
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206 | }
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207 | #endif
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