Mercurial > octave
annotate liboctave/system/lo-sysdep.cc @ 28467:159b6a1eb408
Use wide character overload to open file streams on Windows.
* liboctave/system/lo-sysdep.cc, liboctave/system/lo-sysdep.h (fstream,
ifstream, ofstream): Add "wrapper" functions to open file streams.
* libinterp/corefcn/__fcn__.cc (F__ftp_mput__, F__ftp_mget__),
libinterp/corefcn/debug.cc (do_dbtype),
libinterp/corefcn/help.cc (help_system::raw_help_from_docstrings_file),
libinterp/corefcn/load-save.cc (check_gzip_magic,
load_save_system::get_file_format, load_save_system::dump_octave_core,
load_save_system::load, load_save_system::save),
libinterp/corefcn/oct-hist.cc (mk_tmp_hist_file,
history_system::do_edit_history),
libinterp/corefcn/urlwrite.cc (Furlwrite),
libinterp/octave-value/ov-java.cc (read_java_opts, read_classpath_txt),
libinterp/parse-tree/oct-parse.yy (get_file_line),
liboctave/util/cmd-hist.cc (gnu_history::do_append),
liboctave/util/file-info.cc (file_info::snarf_file),
liboctave/util/url-transfer.cc (base_url_transfer::mget_directory,
base_url_transfer::mput_directory): Use new functions.
* libinterp/corefcn/dlmread.cc (dlmread): Use wide character overload for
std::ifstream::open on Windows.
* src/mkoctfile.in.cc (octave_u8_conv_to_encoding): Dummy function for
cross-compiler.
(main): Use wide character overload of std::ofstream::open on Windows.
author | Markus Mützel <markus.muetzel@gmx.de> |
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date | Fri, 12 Jun 2020 22:13:04 +0200 |
parents | 45763d59cb4f |
children | a40e3c3e17fa |
rev | line source |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 1996-2020 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
2926 | 28 #endif |
29 | |
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30 #include "dir-ops.h" |
5872 | 31 #include "file-ops.h" |
3069 | 32 #include "lo-error.h" |
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33 #include "lo-sysdep.h" |
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34 #include "putenv-wrapper.h" |
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35 #include "uniconv-wrappers.h" |
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36 #include "unistd-wrappers.h" |
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37 #include "unsetenv-wrapper.h" |
2926 | 38 |
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39 #if defined (OCTAVE_USE_WINDOWS_API) |
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40 # include <windows.h> |
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41 # include <wchar.h> |
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42 |
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43 # include "lo-hash.h" |
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44 # include "filepos-wrappers.h" |
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45 # include "unwind-prot.h" |
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46 #endif |
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47 |
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48 namespace octave |
2926 | 49 { |
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50 namespace sys |
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51 { |
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52 std::string |
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53 getcwd (void) |
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54 { |
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55 std::string retval; |
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57 // Using octave_getcwd_wrapper ensures that we have a getcwd that |
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58 // will allocate a buffer as large as necessary if buf and size are |
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59 // both 0. |
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61 char *tmp = octave_getcwd_wrapper (nullptr, 0); |
2926 | 62 |
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63 if (! tmp) |
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64 (*current_liboctave_error_handler) ("unable to find current directory"); |
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65 |
10250 | 66 retval = tmp; |
67 free (tmp); | |
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68 |
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69 return retval; |
10250 | 70 } |
2926 | 71 |
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72 int |
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73 chdir (const std::string& path_arg) |
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74 { |
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75 std::string path = sys::file_ops::tilde_expand (path_arg); |
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77 #if defined (OCTAVE_USE_WINDOWS_API) |
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78 if (path.length () == 2 && path[1] == ':') |
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79 path += '\\'; |
6244 | 80 #endif |
81 | |
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82 return octave_chdir_wrapper (path.c_str ()); |
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83 } |
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84 |
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85 bool |
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86 get_dirlist (const std::string& dirname, string_vector& dirlist, |
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87 std::string& msg) |
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88 { |
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89 dirlist = ""; |
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90 msg = ""; |
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91 #if defined (OCTAVE_USE_WINDOWS_API) |
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92 _WIN32_FIND_DATAW ffd; |
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93 |
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94 std::string path_name (dirname); |
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95 if (path_name.empty ()) |
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96 return true; |
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97 |
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98 if (path_name.back () == '\\' || path_name.back () == '/') |
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99 path_name.push_back ('*'); |
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100 else |
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101 path_name.append (R"(\*)"); |
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102 |
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103 // Find first file in directory. |
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104 std::wstring wpath_name = u8_to_wstring (path_name); |
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105 HANDLE hFind = FindFirstFileW (wpath_name.c_str (), &ffd); |
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106 if (INVALID_HANDLE_VALUE == hFind) |
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107 { |
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108 DWORD errCode = GetLastError (); |
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109 char *errorText = nullptr; |
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110 FormatMessageA (FORMAT_MESSAGE_FROM_SYSTEM | |
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111 FORMAT_MESSAGE_ALLOCATE_BUFFER | |
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112 FORMAT_MESSAGE_IGNORE_INSERTS, |
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113 nullptr, errCode, |
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114 MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), |
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115 reinterpret_cast <char *> (&errorText), 0, nullptr); |
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116 if (errorText != nullptr) |
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117 { |
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118 msg = std::string (errorText); |
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119 LocalFree (errorText); |
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120 } |
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121 return false; |
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122 } |
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123 |
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124 std::list<std::string> dirlist_str; |
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125 do |
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126 dirlist_str.push_back (u8_from_wstring (ffd.cFileName)); |
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127 while (FindNextFileW (hFind, &ffd) != 0); |
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128 |
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129 FindClose(hFind); |
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130 |
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131 dirlist = string_vector (dirlist_str); |
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132 |
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133 #else |
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134 |
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135 dir_entry dir (dirname); |
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136 |
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137 if (! dir) |
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138 { |
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139 msg = dir.error (); |
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140 return false; |
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141 } |
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142 |
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143 dirlist = dir.read (); |
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144 |
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145 dir.close (); |
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146 #endif |
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147 |
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148 return true; |
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149 } |
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150 |
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151 #if defined (OCTAVE_USE_WINDOWS_API) |
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152 |
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153 static bool check_fseek_ftell_workaround_needed (bool set_nonbuffered_mode) |
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154 { |
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155 // To check whether the workaround is needed: |
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156 // |
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157 // * Create a tmp file with LF line endings only. |
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158 // |
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159 // * Open that file for reading in text mode. |
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160 // |
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161 // * Read a line. |
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162 // |
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163 // * Use ftello to record the position of the beginning of the |
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164 // second line. |
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165 // |
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166 // * Read and save the contents of the second line. |
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167 // |
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168 // * Use fseeko to return to the saved position. |
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169 // |
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170 // * Read the second line again and compare to the previously |
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171 // saved text. |
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172 // |
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173 // * If the lines are different, we need to set non-buffered |
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174 // input mode for files opened in text mode. |
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175 |
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176 std::string tmpname = sys::tempnam ("", "oct-"); |
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177 |
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178 if (tmpname.empty ()) |
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179 { |
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180 (*current_liboctave_warning_handler) |
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181 ("fseek/ftell bug check failed (tmp name creation)!"); |
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182 return false; |
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183 } |
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184 |
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185 std::FILE *fptr = std::fopen (tmpname.c_str (), "wb"); |
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186 |
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187 if (! fptr) |
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188 { |
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189 (*current_liboctave_warning_handler) |
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190 ("fseek/ftell bug check failed (opening tmp file for writing)!"); |
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191 return false; |
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192 } |
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193 |
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194 fprintf (fptr, "%s", "foo\nbar\nbaz\n"); |
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195 |
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196 std::fclose (fptr); |
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197 |
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198 fptr = std::fopen (tmpname.c_str (), "rt"); |
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199 |
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200 if (! fptr) |
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201 { |
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202 (*current_liboctave_warning_handler) |
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203 ("fseek/ftell bug check failed (opening tmp file for reading)!"); |
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204 return false; |
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205 } |
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206 |
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207 unwind_action act ([fptr, tmpname] () { |
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208 std::fclose (fptr); |
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209 sys::unlink (tmpname); |
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210 }); |
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211 |
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212 if (set_nonbuffered_mode) |
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213 ::setvbuf (fptr, nullptr, _IONBF, 0); |
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214 |
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215 while (true) |
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216 { |
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217 int c = fgetc (fptr); |
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218 |
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219 if (c == EOF) |
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220 { |
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221 (*current_liboctave_warning_handler) |
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222 ("fseek/ftell bug check failed (skipping first line)!"); |
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223 return false; |
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224 } |
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225 |
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226 if (c == '\n') |
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227 break; |
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228 } |
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229 |
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230 off_t pos = octave_ftello_wrapper (fptr); |
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231 |
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232 char buf1[8]; |
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233 int i = 0; |
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234 while (true) |
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235 { |
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236 int c = fgetc (fptr); |
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237 |
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238 if (c == EOF) |
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239 { |
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240 (*current_liboctave_warning_handler) |
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241 ("fseek/ftell bug check failed (reading second line)!"); |
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242 return false; |
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243 } |
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244 |
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245 if (c == '\n') |
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246 break; |
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247 |
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248 buf1[i++] = static_cast<char> (c); |
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249 } |
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250 buf1[i] = '\0'; |
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251 |
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252 octave_fseeko_wrapper (fptr, pos, SEEK_SET); |
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253 |
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254 char buf2[8]; |
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255 i = 0; |
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256 while (true) |
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257 { |
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258 int c = fgetc (fptr); |
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259 |
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260 if (c == EOF) |
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261 { |
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262 (*current_liboctave_warning_handler) |
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263 ("fseek/ftell bug check failed (reading after repositioning)!"); |
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264 return false; |
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265 } |
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266 |
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267 if (c == '\n') |
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268 break; |
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269 |
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270 buf2[i++] = static_cast<char> (c); |
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271 } |
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272 buf2[i] = '\0'; |
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273 |
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274 return strcmp (buf1, buf2); |
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275 } |
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276 |
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277 #endif |
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278 |
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279 std::FILE * |
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280 fopen (const std::string& filename, const std::string& mode) |
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281 { |
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282 #if defined (OCTAVE_USE_WINDOWS_API) |
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283 |
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284 std::wstring wfilename = u8_to_wstring (filename); |
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285 std::wstring wmode = u8_to_wstring (mode); |
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286 |
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287 std::FILE *fptr = _wfopen (wfilename.c_str (), wmode.c_str ()); |
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288 |
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289 static bool fseek_ftell_bug_workaround_needed = false; |
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290 static bool fseek_ftell_bug_checked = false; |
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291 |
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292 if (! fseek_ftell_bug_checked && mode.find ('t') != std::string::npos) |
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293 { |
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294 // FIXME: Is the following workaround needed for all files |
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295 // opened in text mode, or only for files opened for reading? |
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296 |
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297 // Try to avoid fseek/ftell bug on Windows systems by setting |
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298 // non-buffered input mode for files opened in text mode, but |
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299 // only if it appears that the workaround is needed. See |
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300 // Octave bug #58055. |
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301 |
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302 // To check whether the workaround is needed: |
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303 // |
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304 // * Create a tmp file with LF line endings only. |
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305 // |
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306 // * Open that file for reading in text mode. |
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307 // |
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308 // * Read a line. |
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309 // |
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310 // * Use ftello to record the position of the beginning of |
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311 // the second line. |
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312 // |
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313 // * Read and save the contents of the second line. |
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314 // |
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315 // * Use fseeko to return to the saved position. |
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316 // |
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317 // * Read the second line again and compare to the |
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318 // previously saved text. |
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319 // |
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320 // * If the lines are different, we need to set non-buffered |
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321 // input mode for files opened in text mode. |
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322 // |
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323 // * To verify that the workaround solves the problem, |
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324 // repeat the above test with non-buffered input mode. If |
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325 // that fails, warn that there may be trouble with |
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326 // ftell/fseek when reading files opened in text mode. |
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327 |
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328 if (check_fseek_ftell_workaround_needed (false)) |
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329 { |
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330 if (check_fseek_ftell_workaround_needed (true)) |
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331 (*current_liboctave_warning_handler) |
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332 ("fseek/ftell may fail for files opened in text mode"); |
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333 else |
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334 fseek_ftell_bug_workaround_needed = true; |
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335 } |
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336 |
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337 fseek_ftell_bug_checked = true; |
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338 } |
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339 |
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340 if (fseek_ftell_bug_workaround_needed |
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341 && mode.find ('t') != std::string::npos) |
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342 ::setvbuf (fptr, nullptr, _IONBF, 0); |
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343 |
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344 return fptr; |
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345 |
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346 #else |
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347 return std::fopen (filename.c_str (), mode.c_str ()); |
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348 #endif |
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349 } |
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350 |
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351 std::fstream |
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352 fstream (const std::string& filename, const std::ios::openmode mode) |
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353 { |
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354 #if defined (OCTAVE_USE_WINDOWS_API) |
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355 |
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356 std::wstring wfilename = u8_to_wstring (filename); |
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357 |
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358 return std::fstream (wfilename.c_str (), mode); |
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359 |
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360 #else |
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361 return std::fstream (filename.c_str (), mode); |
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362 #endif |
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363 } |
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364 |
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365 std::ifstream |
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366 ifstream (const std::string& filename, const std::ios::openmode mode) |
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367 { |
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368 #if defined (OCTAVE_USE_WINDOWS_API) |
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369 |
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370 std::wstring wfilename = u8_to_wstring (filename); |
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371 |
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372 return std::ifstream (wfilename.c_str (), mode); |
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373 |
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374 #else |
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375 return std::ifstream (filename.c_str (), mode); |
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376 #endif |
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377 } |
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378 |
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379 std::ofstream |
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380 ofstream (const std::string& filename, const std::ios::openmode mode) |
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381 { |
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382 #if defined (OCTAVE_USE_WINDOWS_API) |
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383 |
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384 std::wstring wfilename = u8_to_wstring (filename); |
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385 |
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386 return std::ofstream (wfilename.c_str (), mode); |
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387 |
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388 #else |
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389 return std::ofstream (filename.c_str (), mode); |
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390 #endif |
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391 } |
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392 |
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393 void |
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394 putenv_wrapper (const std::string& name, const std::string& value) |
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395 { |
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396 // This function was adapted from xputenv from Karl Berry's kpathsearch |
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397 // library. |
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398 // FIXME: make this do the right thing if we don't have a SMART_PUTENV. |
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399 |
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400 int new_len = name.length () + value.length () + 2; |
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401 |
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402 // FIXME: This leaks memory, but so would a call to setenv. |
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403 // Short of extreme measures to track memory, altering the environment |
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404 // always leaks memory, but the saving grace is that the leaks are small. |
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405 |
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406 char *new_item = static_cast<char *> (std::malloc (new_len)); |
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407 |
26506
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lo-sysdep.cc: Fix static analyzer detected issues (bug #55347).
Rik <rik@octave.org>
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408 if (new_item) |
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409 sprintf (new_item, "%s=%s", name.c_str (), value.c_str ()); |
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410 |
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411 // As far as I can see there's no way to distinguish between the |
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412 // various errors; putenv doesn't have errno values. |
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413 |
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414 #if defined (OCTAVE_USE_WINDOWS_API) |
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415 wchar_t *wnew_item = u8_to_wchar (new_item); |
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416 unwind_protect frame; |
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417 frame.add_fcn (std::free, static_cast<void *> (new_item)); |
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418 if (_wputenv (wnew_item) < 0) |
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419 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item); |
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420 #else |
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421 if (octave_putenv_wrapper (new_item) < 0) |
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422 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item); |
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423 #endif |
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424 } |
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425 |
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426 std::string |
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427 getenv_wrapper (const std::string& name) |
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428 { |
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429 #if defined (OCTAVE_USE_WINDOWS_API) |
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430 std::wstring wname = u8_to_wstring (name); |
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431 wchar_t *env = _wgetenv (wname.c_str ()); |
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432 return env ? u8_from_wstring (env) : ""; |
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433 #else |
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434 char *env = ::getenv (name.c_str ()); |
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435 return env ? env : ""; |
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436 #endif |
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437 } |
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438 |
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439 int |
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440 unsetenv_wrapper (const std::string& name) |
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441 { |
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442 #if defined (OCTAVE_USE_WINDOWS_API) |
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443 putenv_wrapper (name, ""); |
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444 |
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445 std::wstring wname = u8_to_wstring (name); |
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446 return (SetEnvironmentVariableW (wname.c_str (), nullptr) ? 0 : -1); |
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447 #else |
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448 return octave_unsetenv_wrapper (name.c_str ()); |
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449 #endif |
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450 } |
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451 |
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452 std::wstring |
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453 u8_to_wstring (const std::string& utf8_string) |
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454 { |
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455 size_t srclen = utf8_string.length (); |
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456 const uint8_t *src = reinterpret_cast<const uint8_t *> |
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457 (utf8_string.c_str ()); |
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458 |
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459 size_t length = 0; |
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460 wchar_t *wchar = reinterpret_cast<wchar_t *> |
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461 (octave_u8_conv_to_encoding ("wchar_t", src, srclen, |
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462 &length)); |
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463 |
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464 std::wstring retval = L""; |
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465 if (wchar != nullptr) |
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466 { |
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467 retval = std::wstring (wchar, length / sizeof (wchar_t)); |
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468 free (static_cast<void *> (wchar)); |
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469 } |
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470 |
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471 return retval; |
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472 } |
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473 |
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474 std::string |
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475 u8_from_wstring (const std::wstring& wchar_string) |
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476 { |
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477 size_t srclen = wchar_string.length () * sizeof (wchar_t); |
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478 const char *src = reinterpret_cast<const char *> (wchar_string.c_str ()); |
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479 |
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480 size_t length = 0; |
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481 char *mbchar = reinterpret_cast<char *> |
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482 (octave_u8_conv_from_encoding ("wchar_t", src, srclen, |
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483 &length)); |
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484 |
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485 std::string retval = ""; |
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486 if (mbchar != nullptr) |
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487 { |
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488 retval = std::string (mbchar, length); |
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489 free (static_cast<void *> (mbchar)); |
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490 } |
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491 |
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492 return retval; |
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493 } |
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494 |
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495 // At quite a few places in the code we are passing file names as |
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496 // char arrays to external library functions. |
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497 |
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498 // When these functions try to locate the corresponding file on the |
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499 // disc, they need to use the wide character API on Windows to |
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500 // correctly open files with non-ASCII characters. |
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501 |
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502 // But they have no way of knowing which encoding we are using for |
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503 // the passed string. So they have no way of reliably converting to |
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504 // a wchar_t array. (I.e. there is no possible fix for these |
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505 // functions with current C or C++.) |
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506 |
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507 // To solve the dilemma, the function "get_ASCII_filename" first |
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508 // checks whether there are any non-ASCII characters in the passed |
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509 // file name. If there are not, it returns the original name. |
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510 |
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511 // Otherwise, it tries to obtain the short file name (8.3 naming |
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512 // scheme) which only consists of ASCII characters and are safe to |
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513 // pass. However, short file names can be disabled for performance |
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514 // reasons on the file system level with NTFS. So there is no |
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515 // guarantee that these exist. |
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516 |
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517 // If short file names are not stored, a hard link to the file is |
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518 // created. For this the path to the file is split at the deepest |
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519 // possible level that doesn't contain non-ASCII characters. At |
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520 // that level a hidden folder is created that holds the hard links. |
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521 // That means we need to have write access on that location. A path |
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522 // to that hard link is returned. |
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523 |
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524 // If the file system is FAT32, there are no hard links. But FAT32 |
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525 // always stores short file names. So we are safe. |
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526 |
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527 // ExFAT that is occasionally used on USB sticks and SD cards stores |
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528 // neither short file names nor does it support hard links. So for |
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529 // exFAT with this function, there is (currently) no way to generate |
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530 // a file name that is stripped from non-ASCII characters but still |
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531 // is valid. |
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532 |
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533 // For Unixy systems, this function does nothing. |
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534 |
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535 std::string |
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536 get_ASCII_filename (const std::string& orig_file_name) |
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537 { |
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538 #if defined (OCTAVE_USE_WINDOWS_API) |
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539 |
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540 // Return file name that only contains ASCII characters that can |
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541 // be used to access the file orig_file_name. The original file |
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542 // must exist in the file system before calling this function. |
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543 // This is useful for passing file names to functions that are not |
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544 // aware of the character encoding we are using. |
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545 |
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546 // 1. Check whether filename contains non-ASCII (UTF-8) characters. |
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547 |
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548 std::string::const_iterator first_non_ASCII |
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549 = std::find_if (orig_file_name.begin (), orig_file_name.end (), |
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550 [](char c) { return (c < 0 || c >= 128); }); |
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551 |
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552 if (first_non_ASCII == orig_file_name.end ()) |
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553 return orig_file_name; |
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554 |
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555 // 2. Check if file system stores short filenames (always |
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556 // ASCII-only). |
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557 |
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558 std::wstring w_orig_file_name_str = u8_to_wstring (orig_file_name); |
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559 const wchar_t *w_orig_file_name = w_orig_file_name_str.c_str (); |
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560 |
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561 // Get full path to file |
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562 wchar_t w_full_file_name[_MAX_PATH]; |
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563 if (_wfullpath (w_full_file_name, w_orig_file_name, _MAX_PATH) == nullptr) |
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564 return orig_file_name; |
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565 |
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566 std::wstring w_full_file_name_str = w_full_file_name; |
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567 |
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568 // Get short filename (8.3) from UTF-16 filename. |
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569 |
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570 long length = GetShortPathNameW (w_full_file_name, nullptr, 0); |
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571 |
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572 if (length > 0) |
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573 { |
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574 // Dynamically allocate the correct size (terminating null char |
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575 // was included in length). |
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576 |
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577 wchar_t *w_short_file_name = new wchar_t[length]; |
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578 GetShortPathNameW (w_full_file_name, w_short_file_name, length); |
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579 |
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580 std::wstring w_short_file_name_str |
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581 = std::wstring (w_short_file_name, length); |
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582 std::string short_file_name = u8_from_wstring (w_short_file_name_str); |
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583 |
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584 if (w_short_file_name_str.compare (0, length-1, w_full_file_name_str) != 0) |
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585 return short_file_name; |
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586 } |
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587 |
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588 // 3. Create hard link with only-ASCII characters. |
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589 // Get longest possible part of path that only contains ASCII chars. |
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590 |
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591 std::wstring::iterator w_first_non_ASCII |
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592 = std::find_if (w_full_file_name_str.begin (), w_full_file_name_str.end (), |
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593 [](wchar_t c) { return (c < 0 || c >= 128); }); |
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594 std::wstring tmp_substr |
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595 = std::wstring (w_full_file_name_str.begin (), w_first_non_ASCII); |
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596 |
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597 size_t pos |
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598 = tmp_substr.find_last_of (u8_to_wstring (file_ops::dir_sep_chars ())); |
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599 |
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600 std::string par_dir |
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601 = u8_from_wstring (w_full_file_name_str.substr (0, pos+1)); |
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602 |
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603 // Create .oct_ascii directory. |
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604 // FIXME: We need to have write permission in this location. |
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605 |
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606 std::string oct_ascii_dir = par_dir + ".oct_ascii"; |
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607 std::string test_dir = canonicalize_file_name (oct_ascii_dir); |
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608 |
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609 if (test_dir.empty ()) |
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610 { |
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611 std::string msg; |
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612 int status = sys::mkdir (oct_ascii_dir, 0777, msg); |
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613 |
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614 if (status < 0) |
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615 return orig_file_name; |
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616 |
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617 // Set hidden property. |
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618 SetFileAttributesA (oct_ascii_dir.c_str (), FILE_ATTRIBUTE_HIDDEN); |
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619 } |
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620 |
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621 // Create file from hash of full filename. |
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622 std::string filename_hash |
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623 = (oct_ascii_dir + file_ops::dir_sep_str () |
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624 + crypto::hash ("SHA1", orig_file_name)); |
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625 |
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626 std::string abs_filename_hash = canonicalize_file_name (filename_hash); |
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627 |
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628 if (! abs_filename_hash.empty ()) |
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629 sys::unlink (filename_hash); |
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630 |
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631 wchar_t w_filename_hash[filename_hash.length ()+1] = {0}; |
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632 |
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633 for (size_t i=0; i < filename_hash.length (); i++) |
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634 w_filename_hash[i] = filename_hash.at (i); |
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635 |
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636 if (CreateHardLinkW (w_filename_hash, w_orig_file_name, nullptr)) |
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637 return filename_hash; |
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638 |
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639 #endif |
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640 |
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641 return orig_file_name; |
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642 } |
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643 } |
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644 } |