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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cerrno> |
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28 #include <cstdio> |
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29 #include <cstdlib> |
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30 #include <cstring> |
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31 |
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32 #include <iostream> |
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33 #include <vector> |
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34 |
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35 #ifdef HAVE_SYS_TYPES_H |
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36 #include <sys/types.h> |
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37 #endif |
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38 |
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39 #ifdef HAVE_UNISTD_H |
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40 #include <unistd.h> |
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41 #endif |
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42 |
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43 #include "file-ops.h" |
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44 #include "oct-env.h" |
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45 #include "oct-passwd.h" |
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46 #include "pathlen.h" |
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47 #include "statdefs.h" |
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48 #include "str-vec.h" |
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49 |
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50 #define NOT_SUPPORTED(nm) \ |
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51 nm ": not supported on this system" |
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52 |
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53 #if (defined (OCTAVE_HAVE_WINDOWS_FILESYSTEM) \ |
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54 && ! defined (OCTAVE_HAVE_POSIX_FILESYSTEM)) |
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55 char file_ops::dir_sep_char = '\\'; |
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56 std::string file_ops::dir_sep_str ("\\"); |
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57 #else |
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58 char file_ops::dir_sep_char = '/'; |
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59 std::string file_ops::dir_sep_str ("/"); |
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60 #endif |
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61 |
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62 #if (defined (OCTAVE_HAVE_WINDOWS_FILESYSTEM) \ |
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63 && defined (OCTAVE_HAVE_POSIX_FILESYSTEM)) |
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64 std::string file_ops::dir_sep_chars ("/\\"); |
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65 #else |
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66 std::string file_ops::dir_sep_chars (file_ops::dir_sep_str); |
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67 #endif |
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68 |
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69 // We provide a replacement for mkdir(). |
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70 |
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71 int |
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72 file_ops::mkdir (const std::string& name, mode_t mode) |
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73 { |
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74 std::string msg; |
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75 return mkdir (name, mode, msg); |
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76 } |
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77 |
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78 int |
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79 file_ops::mkdir (const std::string& name, mode_t mode, std::string& msg) |
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80 { |
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81 msg = std::string (); |
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82 |
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83 int status = -1; |
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84 |
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85 #if defined (HAVE_MKDIR) |
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86 |
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87 #if defined (MKDIR_TAKES_ONE_ARG) |
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88 status = ::mkdir (name.c_str ()); |
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89 #else |
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90 status = ::mkdir (name.c_str (), mode); |
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91 #endif |
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92 |
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93 if (status < 0) |
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94 { |
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95 using namespace std; |
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96 msg = ::strerror (errno); |
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97 } |
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98 #else |
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99 msg = NOT_SUPPORTED ("mkdir"); |
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100 #endif |
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101 |
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102 return status; |
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103 } |
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104 |
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105 // I don't know how to emulate this on systems that don't provide it. |
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106 |
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107 int |
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108 file_ops::mkfifo (const std::string& name, mode_t mode) |
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109 { |
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110 std::string msg; |
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111 return mkfifo (name, mode, msg); |
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112 } |
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113 |
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114 int |
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115 file_ops::mkfifo (const std::string& name, mode_t mode, std::string& msg) |
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116 { |
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117 msg = std::string (); |
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118 |
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119 int status = -1; |
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120 |
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121 #if defined (HAVE_MKFIFO) |
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122 status = ::mkfifo (name.c_str (), mode); |
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123 |
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124 if (status < 0) |
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125 { |
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126 using namespace std; |
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127 msg = ::strerror (errno); |
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128 } |
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129 #else |
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130 msg = NOT_SUPPORTED ("mkfifo"); |
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131 #endif |
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132 |
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133 return status; |
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134 } |
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135 |
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136 // I don't know how to emulate this on systems that don't provide it. |
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137 |
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138 int |
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139 file_ops::link (const std::string& old_name, const std::string& new_name) |
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140 { |
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141 std::string msg; |
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142 return link (old_name, new_name, msg); |
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143 } |
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144 |
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145 int |
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146 file_ops::link (const std::string& old_name, |
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147 const std::string& new_name, std::string& msg) |
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148 { |
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149 msg = std::string (); |
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150 |
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151 int status = -1; |
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152 |
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153 #if defined (HAVE_LINK) |
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154 status = ::link (old_name.c_str (), new_name.c_str ()); |
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155 |
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156 if (status < 0) |
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157 { |
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158 using namespace std; |
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159 msg = ::strerror (errno); |
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160 } |
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161 #else |
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162 msg = NOT_SUPPORTED ("link"); |
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163 #endif |
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164 |
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165 return status; |
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166 } |
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167 |
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168 // I don't know how to emulate this on systems that don't provide it. |
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169 |
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170 int |
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171 file_ops::symlink (const std::string& old_name, const std::string& new_name) |
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172 { |
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173 std::string msg; |
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174 return symlink (old_name, new_name, msg); |
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175 } |
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176 |
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177 int |
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178 file_ops::symlink (const std::string& old_name, |
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179 const std::string& new_name, std::string& msg) |
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180 { |
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181 msg = std::string (); |
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182 |
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183 int status = -1; |
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184 |
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185 #if defined (HAVE_SYMLINK) |
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186 |
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187 OCTAVE_LOCAL_BUFFER (char, old_nm, old_name.length ()); |
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188 OCTAVE_LOCAL_BUFFER (char, new_nm, new_name.length ()); |
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189 |
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190 strcpy (old_nm, old_name.c_str ()); |
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191 strcpy (new_nm, new_name.c_str ()); |
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192 |
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193 status = ::symlink (old_nm, new_nm); |
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194 |
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195 if (status < 0) |
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196 { |
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197 using namespace std; |
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198 msg = ::strerror (errno); |
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199 } |
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200 #else |
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201 msg = NOT_SUPPORTED ("symlink"); |
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202 #endif |
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203 |
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204 return status; |
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205 } |
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206 |
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207 // We provide a replacement for rename(). |
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208 |
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209 int |
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210 file_ops::readlink (const std::string& path, std::string& result) |
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211 { |
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212 std::string msg; |
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213 return readlink (path, result, msg); |
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214 } |
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215 |
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216 int |
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217 file_ops::readlink (const std::string& path, std::string& result, |
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218 std::string& msg) |
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219 { |
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220 int status = -1; |
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221 |
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222 msg = std::string (); |
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223 |
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224 #if defined (HAVE_READLINK) |
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225 char buf[MAXPATHLEN+1]; |
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226 |
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227 OCTAVE_LOCAL_BUFFER (char, p, path.length ()); |
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228 |
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229 strcpy (p, path.c_str ()); |
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230 |
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231 status = ::readlink (p, buf, MAXPATHLEN); |
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232 |
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233 if (status < 0) |
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234 { |
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235 using namespace std; |
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236 msg = ::strerror (errno); |
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237 } |
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238 else |
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239 { |
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240 buf[status] = '\0'; |
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241 result = std::string (buf); |
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242 status = 0; |
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243 } |
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244 #else |
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245 msg = NOT_SUPPORTED ("rename"); |
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246 #endif |
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247 |
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248 return status; |
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249 } |
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250 |
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251 // We provide a replacement for rename(). |
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252 |
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253 int |
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254 file_ops::rename (const std::string& from, const std::string& to) |
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255 { |
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256 std::string msg; |
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257 return rename (from, to, msg); |
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258 } |
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259 |
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260 int |
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261 file_ops::rename (const std::string& from, const std::string& to, |
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262 std::string& msg) |
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263 { |
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264 int status = -1; |
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265 |
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266 msg = std::string (); |
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267 |
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268 #if defined (HAVE_RENAME) |
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269 status = ::rename (from.c_str (), to.c_str ()); |
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270 |
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271 if (status < 0) |
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272 { |
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273 using namespace std; |
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274 msg = ::strerror (errno); |
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275 } |
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276 #else |
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277 msg = NOT_SUPPORTED ("rename"); |
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278 #endif |
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279 |
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280 return status; |
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281 } |
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282 |
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283 // We provide a replacement for rmdir(). |
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284 |
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285 int |
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286 file_ops::rmdir (const std::string& name) |
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287 { |
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288 std::string msg; |
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289 return rmdir (name, msg); |
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290 } |
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291 |
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292 int |
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293 file_ops::rmdir (const std::string& name, std::string& msg) |
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294 { |
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295 msg = std::string (); |
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296 |
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297 int status = -1; |
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298 |
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299 #if defined (HAVE_RMDIR) |
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300 status = ::rmdir (name.c_str ()); |
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301 |
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302 if (status < 0) |
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303 { |
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304 using namespace std; |
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305 msg = ::strerror (errno); |
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306 } |
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307 #else |
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308 msg = NOT_SUPPORTED ("rmdir"); |
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309 #endif |
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310 |
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311 return status; |
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312 } |
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313 |
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314 // We provide a replacement for tempnam(). |
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315 |
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316 std::string |
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317 file_ops::tempnam (const std::string& dir, const std::string& pfx) |
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318 { |
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319 std::string msg; |
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320 return tempnam (dir, pfx, msg); |
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321 } |
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322 |
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323 std::string |
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324 file_ops::tempnam (const std::string& dir, const std::string& pfx, |
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325 std::string& msg) |
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326 { |
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327 msg = std::string (); |
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328 |
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329 std::string retval; |
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330 |
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331 const char *pdir = dir.empty () ? 0 : dir.c_str (); |
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332 |
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333 const char *ppfx = pfx.empty () ? 0 : pfx.c_str (); |
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334 |
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335 char *tmp = ::tempnam (pdir, ppfx); |
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336 |
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337 if (tmp) |
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338 { |
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339 retval = tmp; |
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340 |
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341 ::free (tmp); |
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342 } |
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343 else |
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344 { |
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345 using namespace std; |
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346 msg = ::strerror (errno); |
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347 } |
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348 |
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349 return retval; |
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350 } |
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351 |
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352 // The following tilde-expansion code was stolen and adapted from |
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353 // readline. |
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354 |
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355 // The default value of tilde_additional_prefixes. This is set to |
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356 // whitespace preceding a tilde so that simple programs which do not |
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357 // perform any word separation get desired behaviour. |
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358 static const char *default_prefixes[] = { " ~", "\t~", ":~", 0 }; |
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359 |
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360 // The default value of tilde_additional_suffixes. This is set to |
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361 // whitespace or newline so that simple programs which do not perform |
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362 // any word separation get desired behaviour. |
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363 static const char *default_suffixes[] = { " ", "\n", ":", 0 }; |
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364 |
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365 // If non-null, this contains the address of a function that the |
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366 // application wants called before trying the standard tilde |
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367 // expansions. The function is called with the text sans tilde, and |
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368 // returns a malloc()'ed string which is the expansion, or a NULL |
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369 // pointer if the expansion fails. |
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370 file_ops::tilde_expansion_hook file_ops::tilde_expansion_preexpansion_hook = 0; |
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371 |
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372 // If non-null, this contains the address of a function to call if the |
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373 // standard meaning for expanding a tilde fails. The function is |
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374 // called with the text (sans tilde, as in "foo"), and returns a |
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375 // malloc()'ed string which is the expansion, or a NULL pointer if |
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376 // there is no expansion. |
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377 file_ops::tilde_expansion_hook file_ops::tilde_expansion_failure_hook = 0; |
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378 |
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379 // When non-null, this is a NULL terminated array of strings which are |
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380 // duplicates for a tilde prefix. Bash uses this to expand `=~' and |
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381 // `:~'. |
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382 string_vector file_ops::tilde_additional_prefixes = default_prefixes; |
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383 |
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384 // When non-null, this is a NULL terminated array of strings which |
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385 // match the end of a username, instead of just "/". Bash sets this |
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386 // to `:' and `=~'. |
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387 string_vector file_ops::tilde_additional_suffixes = default_suffixes; |
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388 |
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389 // Find the start of a tilde expansion in S, and return the index |
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390 // of the tilde which starts the expansion. Place the length of the |
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391 // text which identified this tilde starter in LEN, excluding the |
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392 // tilde itself. |
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393 |
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394 static size_t |
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395 tilde_find_prefix (const std::string& s, size_t& len) |
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396 { |
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397 len = 0; |
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398 |
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399 size_t s_len = s.length (); |
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400 |
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401 if (s_len == 0 || s[0] == '~') |
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402 return 0; |
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403 |
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404 string_vector prefixes = file_ops::tilde_additional_prefixes; |
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405 |
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406 if (! prefixes.empty ()) |
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407 { |
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408 for (size_t i = 0; i < s_len; i++) |
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409 { |
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410 for (int j = 0; j < prefixes.length (); j++) |
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411 { |
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412 size_t pfx_len = prefixes[j].length (); |
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413 |
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414 if (prefixes[j].compare (s.substr (i, pfx_len)) == 0) |
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415 { |
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416 len = pfx_len - 1; |
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417 return i + len; |
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418 } |
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419 } |
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420 } |
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421 } |
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422 |
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423 return s_len; |
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424 } |
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425 |
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426 // Find the end of a tilde expansion in S, and return the index |
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427 // of the character which ends the tilde definition. |
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428 |
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429 static size_t |
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430 tilde_find_suffix (const std::string& s) |
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431 { |
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432 size_t s_len = s.length (); |
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433 |
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434 string_vector suffixes = file_ops::tilde_additional_suffixes; |
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435 |
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436 size_t i = 0; |
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437 |
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438 for ( ; i < s_len; i++) |
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439 { |
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440 if (s[i] == file_ops::dir_sep_char) |
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441 break; |
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442 |
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443 if (! suffixes.empty ()) |
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444 { |
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445 for (int j = 0; j < suffixes.length (); j++) |
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446 { |
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447 size_t sfx_len = suffixes[j].length (); |
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448 |
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449 if (suffixes[j].compare (s.substr (i, sfx_len)) == 0) |
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450 return i; |
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451 } |
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452 } |
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453 } |
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454 |
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455 return i; |
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456 } |
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457 |
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458 // Take FNAME and return the tilde prefix we want expanded. |
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459 |
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3504
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460 static std::string |
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461 isolate_tilde_prefix (const std::string& fname) |
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462 { |
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463 size_t f_len = fname.length (); |
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464 |
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465 size_t len = 1; |
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466 |
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4101
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467 while (len < f_len && fname[len] != file_ops::dir_sep_char) |
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468 len++; |
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469 |
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470 return fname.substr (1, len); |
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471 } |
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472 |
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473 // Do the work of tilde expansion on FILENAME. FILENAME starts with a |
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474 // tilde. |
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475 |
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3504
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476 static std::string |
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477 tilde_expand_word (const std::string& filename) |
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3040
|
478 { |
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479 size_t f_len = filename.length (); |
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480 |
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481 if (f_len == 0 || filename[0] != '~') |
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482 return filename; |
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483 |
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484 // A leading `~/' or a bare `~' is *always* translated to the value |
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|
485 // of $HOME or the home directory of the current user, regardless of |
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486 // any preexpansion hook. |
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487 |
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4101
|
488 if (f_len == 1 || filename[1] == file_ops::dir_sep_char) |
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3040
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489 return octave_env::get_home_directory () + filename.substr (1); |
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490 |
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3504
|
491 std::string username = isolate_tilde_prefix (filename); |
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3040
|
492 |
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493 size_t user_len = username.length (); |
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494 |
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3504
|
495 std::string dirname; |
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3040
|
496 |
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497 if (file_ops::tilde_expansion_preexpansion_hook) |
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498 { |
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3504
|
499 std::string expansion |
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3040
|
500 = file_ops::tilde_expansion_preexpansion_hook (username); |
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|
501 |
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|
502 if (! expansion.empty ()) |
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3074
|
503 return expansion + filename.substr (user_len+1); |
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3040
|
504 } |
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|
505 |
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506 // No preexpansion hook, or the preexpansion hook failed. Look in the |
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|
507 // password database. |
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508 |
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|
509 octave_passwd pw = octave_passwd::getpwnam (username); |
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510 |
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511 if (! pw) |
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|
512 { |
|
|
513 // If the calling program has a special syntax for expanding tildes, |
|
|
514 // and we couldn't find a standard expansion, then let them try. |
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|
515 |
|
|
516 if (file_ops::tilde_expansion_failure_hook) |
|
|
517 { |
|
3504
|
518 std::string expansion |
|
3040
|
519 = file_ops::tilde_expansion_failure_hook (username); |
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|
520 |
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|
521 if (! expansion.empty ()) |
|
3074
|
522 dirname = expansion + filename.substr (user_len+1); |
|
3040
|
523 } |
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|
524 |
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|
525 // If we don't have a failure hook, or if the failure hook did not |
|
|
526 // expand the tilde, return a copy of what we were passed. |
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|
527 |
|
|
528 if (dirname.length () == 0) |
|
|
529 dirname = filename; |
|
|
530 } |
|
|
531 else |
|
3074
|
532 dirname = pw.dir () + filename.substr (user_len+1); |
|
3040
|
533 |
|
|
534 return dirname; |
|
|
535 } |
|
|
536 |
|
|
537 // If NAME has a leading ~ or ~user, Unix-style, expand it to the |
|
|
538 // user's home directory. If no ~, or no <pwd.h>, just return NAME. |
|
|
539 |
|
3504
|
540 std::string |
|
|
541 file_ops::tilde_expand (const std::string& name) |
|
2926
|
542 { |
|
3504
|
543 std::string result; |
|
2926
|
544 |
|
3040
|
545 size_t name_len = name.length (); |
|
2926
|
546 |
|
3040
|
547 // Scan through S expanding tildes as we come to them. |
|
2926
|
548 |
|
3040
|
549 size_t pos = 0; |
|
2926
|
550 |
|
3040
|
551 while (1) |
|
|
552 { |
|
|
553 if (pos > name_len) |
|
|
554 break; |
|
2926
|
555 |
|
3040
|
556 size_t len; |
|
|
557 |
|
|
558 // Make START point to the tilde which starts the expansion. |
|
2926
|
559 |
|
3040
|
560 size_t start = tilde_find_prefix (name.substr (pos), len); |
|
|
561 |
|
|
562 result.append (name.substr (pos, start)); |
|
2926
|
563 |
|
3040
|
564 // Advance STRING to the starting tilde. |
|
|
565 |
|
|
566 pos += start; |
|
2926
|
567 |
|
3040
|
568 // Make FINI be the index of one after the last character of the |
|
|
569 // username. |
|
2926
|
570 |
|
3040
|
571 size_t fini = tilde_find_suffix (name.substr (pos)); |
|
2926
|
572 |
|
3040
|
573 // If both START and FINI are zero, we are all done. |
|
2926
|
574 |
|
3040
|
575 if (! (start || fini)) |
|
|
576 break; |
|
2926
|
577 |
|
3040
|
578 // Expand the entire tilde word, and copy it into RESULT. |
|
2947
|
579 |
|
3504
|
580 std::string tilde_word = name.substr (pos, fini); |
|
3040
|
581 |
|
|
582 pos += fini; |
|
2926
|
583 |
|
3504
|
584 std::string expansion = tilde_expand_word (tilde_word); |
|
3040
|
585 |
|
|
586 result.append (expansion); |
|
2926
|
587 } |
|
|
588 |
|
3040
|
589 return result; |
|
2926
|
590 } |
|
|
591 |
|
|
592 // A vector version of the above. |
|
|
593 |
|
|
594 string_vector |
|
|
595 file_ops::tilde_expand (const string_vector& names) |
|
|
596 { |
|
|
597 string_vector retval; |
|
|
598 |
|
|
599 int n = names.length (); |
|
|
600 |
|
|
601 retval.resize (n); |
|
|
602 |
|
|
603 for (int i = 0; i < n; i++) |
|
|
604 retval[i] = file_ops::tilde_expand (names[i]); |
|
|
605 |
|
|
606 return retval; |
|
|
607 } |
|
1802
|
608 |
|
1765
|
609 int |
|
2926
|
610 file_ops::umask (mode_t mode) |
|
1765
|
611 { |
|
|
612 #if defined (HAVE_UMASK) |
|
2926
|
613 return ::umask (mode); |
|
1765
|
614 #else |
|
|
615 return 0; |
|
|
616 #endif |
|
|
617 } |
|
|
618 |
|
1773
|
619 int |
|
3504
|
620 file_ops::unlink (const std::string& name) |
|
1773
|
621 { |
|
3504
|
622 std::string msg; |
|
2937
|
623 return unlink (name, msg); |
|
1773
|
624 } |
|
|
625 |
|
2668
|
626 int |
|
3504
|
627 file_ops::unlink (const std::string& name, std::string& msg) |
|
2668
|
628 { |
|
3504
|
629 msg = std::string (); |
|
2668
|
630 |
|
2937
|
631 int status = -1; |
|
|
632 |
|
|
633 #if defined (HAVE_UNLINK) |
|
|
634 status = ::unlink (name.c_str ()); |
|
2668
|
635 |
|
|
636 if (status < 0) |
|
3504
|
637 { |
|
|
638 using namespace std; |
|
|
639 msg = ::strerror (errno); |
|
|
640 } |
|
2937
|
641 #else |
|
|
642 msg = NOT_SUPPORTED ("unlink"); |
|
|
643 #endif |
|
2668
|
644 |
|
|
645 return status; |
|
|
646 } |
|
|
647 |
|
4097
|
648 bool |
|
|
649 file_ops::is_dir_sep (char c) |
|
|
650 { |
|
4101
|
651 return dir_sep_chars.find (c) != NPOS; |
|
4097
|
652 } |
|
|
653 |
|
1765
|
654 /* |
|
|
655 ;;; Local Variables: *** |
|
|
656 ;;; mode: C++ *** |
|
|
657 ;;; End: *** |
|
|
658 */ |
