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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 |
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34 #ifdef HAVE_SYS_TYPES_H |
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35 #include <sys/types.h> |
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36 #endif |
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37 |
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38 #ifdef HAVE_UNISTD_H |
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39 #include <unistd.h> |
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40 #endif |
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41 |
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42 #include "file-ops.h" |
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43 #include "oct-env.h" |
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44 #include "oct-passwd.h" |
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45 #include "statdefs.h" |
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46 #include "str-vec.h" |
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47 |
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48 #define NOT_SUPPORTED(nm) \ |
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49 nm ## ": not supported on this system" |
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50 |
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51 // We provide a replacement for mkdir(). |
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52 |
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53 int |
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54 file_ops::mkdir (const std::string& name, mode_t mode) |
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55 { |
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56 std::string msg; |
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57 return mkdir (name, mode, msg); |
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58 } |
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59 |
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60 int |
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61 file_ops::mkdir (const std::string& name, mode_t mode, std::string& msg) |
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62 { |
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63 msg = std::string (); |
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64 |
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65 int status = -1; |
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66 |
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67 #if defined (HAVE_MKDIR) |
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68 status = ::mkdir (name.c_str (), mode); |
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69 |
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70 if (status < 0) |
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71 { |
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72 using namespace std; |
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73 msg = ::strerror (errno); |
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74 } |
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75 #else |
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76 msg = NOT_SUPPORTED ("mkdir"); |
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77 #endif |
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78 |
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79 return status; |
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80 } |
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81 |
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82 // I don't know how to emulate this on systems that don't provide it. |
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83 |
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84 int |
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85 file_ops::mkfifo (const std::string& name, mode_t mode) |
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86 { |
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87 std::string msg; |
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88 return mkfifo (name, mode, msg); |
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89 } |
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90 |
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91 int |
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92 file_ops::mkfifo (const std::string& name, mode_t mode, std::string& msg) |
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93 { |
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94 msg = std::string (); |
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95 |
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96 int status = -1; |
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97 |
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98 #if defined (HAVE_MKFIFO) |
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99 status = ::mkfifo (name.c_str (), mode); |
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100 |
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101 if (status < 0) |
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102 { |
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103 using namespace std; |
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104 msg = ::strerror (errno); |
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105 } |
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106 #else |
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107 msg = NOT_SUPPORTED ("mkfifo"); |
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108 #endif |
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109 |
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110 return status; |
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111 } |
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112 |
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113 // We provide a replacement for rename(). |
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114 |
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115 int |
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116 file_ops::rename (const std::string& from, const std::string& to) |
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117 { |
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118 std::string msg; |
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119 return rename (from, to, msg); |
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120 } |
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121 |
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122 int |
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123 file_ops::rename (const std::string& from, const std::string& to, |
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124 std::string& msg) |
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125 { |
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126 int status = -1; |
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127 |
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128 msg = std::string (); |
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129 |
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130 #if defined (HAVE_RENAME) |
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131 status = ::rename (from.c_str (), to.c_str ()); |
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132 |
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133 if (status < 0) |
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134 { |
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135 using namespace std; |
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136 msg = ::strerror (errno); |
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137 } |
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138 #else |
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139 msg = NOT_SUPPORTED ("rename"); |
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140 #endif |
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141 |
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142 return status; |
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143 } |
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144 |
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145 // We provide a replacement for rmdir(). |
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146 |
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147 int |
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148 file_ops::rmdir (const std::string& name) |
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149 { |
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150 std::string msg; |
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151 return rmdir (name, msg); |
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152 } |
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153 |
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154 int |
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155 file_ops::rmdir (const std::string& name, std::string& msg) |
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156 { |
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157 msg = std::string (); |
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158 |
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159 int status = -1; |
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160 |
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161 #if defined (HAVE_RMDIR) |
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162 status = ::rmdir (name.c_str ()); |
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163 |
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164 if (status < 0) |
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165 { |
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166 using namespace std; |
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167 msg = ::strerror (errno); |
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168 } |
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169 #else |
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170 msg = NOT_SUPPORTED ("rmdir"); |
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171 #endif |
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172 |
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173 return status; |
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174 } |
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175 |
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176 // We provide a replacement for tempnam(). |
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177 |
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178 std::string |
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179 file_ops::tempnam (const std::string& dir, const std::string& pfx) |
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180 { |
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181 std::string msg; |
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182 return tempnam (dir, pfx, msg); |
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183 } |
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184 |
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185 std::string |
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186 file_ops::tempnam (const std::string& dir, const std::string& pfx, |
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187 std::string& msg) |
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188 { |
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189 msg = std::string (); |
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190 |
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191 std::string retval; |
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192 |
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193 const char *pdir = dir.empty () ? 0 : dir.c_str (); |
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194 |
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195 const char *ppfx = pfx.empty () ? 0 : pfx.c_str (); |
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196 |
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197 char *tmp = ::tempnam (pdir, ppfx); |
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198 |
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199 if (tmp) |
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200 { |
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201 retval = tmp; |
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202 |
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203 ::free (tmp); |
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204 } |
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205 else |
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206 { |
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207 using namespace std; |
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208 msg = ::strerror (errno); |
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209 } |
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210 |
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211 return retval; |
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212 } |
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213 |
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214 // The following tilde-expansion code was stolen and adapted from |
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215 // readline. |
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216 |
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217 // XXX FIXME XXX |
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218 #define DIR_SEP_CHAR '/' |
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219 |
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220 // The default value of tilde_additional_prefixes. This is set to |
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221 // whitespace preceding a tilde so that simple programs which do not |
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222 // perform any word separation get desired behaviour. |
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223 static const char *default_prefixes[] = { " ~", "\t~", ":~", 0 }; |
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224 |
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225 // The default value of tilde_additional_suffixes. This is set to |
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226 // whitespace or newline so that simple programs which do not perform |
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227 // any word separation get desired behaviour. |
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228 static const char *default_suffixes[] = { " ", "\n", ":", 0 }; |
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229 |
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230 // If non-null, this contains the address of a function that the |
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231 // application wants called before trying the standard tilde |
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232 // expansions. The function is called with the text sans tilde, and |
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233 // returns a malloc()'ed string which is the expansion, or a NULL |
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234 // pointer if the expansion fails. |
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235 file_ops::tilde_expansion_hook file_ops::tilde_expansion_preexpansion_hook = 0; |
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236 |
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237 // If non-null, this contains the address of a function to call if the |
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238 // standard meaning for expanding a tilde fails. The function is |
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239 // called with the text (sans tilde, as in "foo"), and returns a |
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240 // malloc()'ed string which is the expansion, or a NULL pointer if |
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241 // there is no expansion. |
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242 file_ops::tilde_expansion_hook file_ops::tilde_expansion_failure_hook = 0; |
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243 |
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244 // When non-null, this is a NULL terminated array of strings which are |
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245 // duplicates for a tilde prefix. Bash uses this to expand `=~' and |
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246 // `:~'. |
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247 string_vector file_ops::tilde_additional_prefixes = default_prefixes; |
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248 |
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249 // When non-null, this is a NULL terminated array of strings which |
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250 // match the end of a username, instead of just "/". Bash sets this |
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251 // to `:' and `=~'. |
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252 string_vector file_ops::tilde_additional_suffixes = default_suffixes; |
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253 |
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254 // Find the start of a tilde expansion in S, and return the index |
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255 // of the tilde which starts the expansion. Place the length of the |
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256 // text which identified this tilde starter in LEN, excluding the |
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257 // tilde itself. |
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258 |
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259 static size_t |
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260 tilde_find_prefix (const std::string& s, size_t& len) |
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261 { |
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262 len = 0; |
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263 |
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264 size_t s_len = s.length (); |
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265 |
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266 if (s_len == 0 || s[0] == '~') |
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267 return 0; |
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268 |
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269 string_vector prefixes = file_ops::tilde_additional_prefixes; |
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270 |
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271 if (! prefixes.empty ()) |
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272 { |
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273 for (size_t i = 0; i < s_len; i++) |
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274 { |
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275 for (int j = 0; j < prefixes.length (); j++) |
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276 { |
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277 size_t pfx_len = prefixes[j].length (); |
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278 |
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279 if (prefixes[j].compare (s.substr (i, pfx_len)) == 0) |
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280 { |
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281 len = pfx_len - 1; |
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282 return i + len; |
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283 } |
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284 } |
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285 } |
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286 } |
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287 |
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288 return s_len; |
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289 } |
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290 |
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291 // Find the end of a tilde expansion in S, and return the index |
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292 // of the character which ends the tilde definition. |
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293 |
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294 static size_t |
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295 tilde_find_suffix (const std::string& s) |
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296 { |
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297 size_t s_len = s.length (); |
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298 |
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299 string_vector suffixes = file_ops::tilde_additional_suffixes; |
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300 |
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301 size_t i = 0; |
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302 |
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303 for ( ; i < s_len; i++) |
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304 { |
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305 if (s[i] == DIR_SEP_CHAR) |
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306 break; |
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307 |
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308 if (! suffixes.empty ()) |
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309 { |
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310 for (int j = 0; j < suffixes.length (); j++) |
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311 { |
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312 size_t sfx_len = suffixes[j].length (); |
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313 |
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314 if (suffixes[j].compare (s.substr (i, sfx_len)) == 0) |
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315 return i; |
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316 } |
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317 } |
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318 } |
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319 |
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320 return i; |
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321 } |
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322 |
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323 // Take FNAME and return the tilde prefix we want expanded. |
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324 |
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325 static std::string |
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326 isolate_tilde_prefix (const std::string& fname) |
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327 { |
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328 size_t f_len = fname.length (); |
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329 |
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330 size_t len = 1; |
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331 |
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332 while (len < f_len && fname[len] != DIR_SEP_CHAR) |
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333 len++; |
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334 |
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335 return fname.substr (1, len); |
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336 } |
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337 |
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338 // Do the work of tilde expansion on FILENAME. FILENAME starts with a |
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339 // tilde. |
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340 |
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341 static std::string |
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342 tilde_expand_word (const std::string& filename) |
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343 { |
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344 size_t f_len = filename.length (); |
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345 |
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346 if (f_len == 0 || filename[0] != '~') |
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347 return filename; |
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348 |
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349 // A leading `~/' or a bare `~' is *always* translated to the value |
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350 // of $HOME or the home directory of the current user, regardless of |
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351 // any preexpansion hook. |
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352 |
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353 if (f_len == 1 || filename[1] == DIR_SEP_CHAR) |
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354 return octave_env::get_home_directory () + filename.substr (1); |
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355 |
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356 std::string username = isolate_tilde_prefix (filename); |
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357 |
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358 size_t user_len = username.length (); |
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359 |
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360 std::string dirname; |
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361 |
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362 if (file_ops::tilde_expansion_preexpansion_hook) |
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363 { |
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364 std::string expansion |
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365 = file_ops::tilde_expansion_preexpansion_hook (username); |
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366 |
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367 if (! expansion.empty ()) |
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368 return expansion + filename.substr (user_len+1); |
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369 } |
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370 |
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371 // No preexpansion hook, or the preexpansion hook failed. Look in the |
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372 // password database. |
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373 |
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374 octave_passwd pw = octave_passwd::getpwnam (username); |
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375 |
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376 if (! pw) |
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377 { |
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378 // If the calling program has a special syntax for expanding tildes, |
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379 // and we couldn't find a standard expansion, then let them try. |
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380 |
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381 if (file_ops::tilde_expansion_failure_hook) |
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382 { |
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383 std::string expansion |
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384 = file_ops::tilde_expansion_failure_hook (username); |
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385 |
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386 if (! expansion.empty ()) |
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387 dirname = expansion + filename.substr (user_len+1); |
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388 } |
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389 |
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390 // If we don't have a failure hook, or if the failure hook did not |
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391 // expand the tilde, return a copy of what we were passed. |
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392 |
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393 if (dirname.length () == 0) |
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394 dirname = filename; |
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395 } |
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396 else |
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397 dirname = pw.dir () + filename.substr (user_len+1); |
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398 |
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399 return dirname; |
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400 } |
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401 |
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402 // If NAME has a leading ~ or ~user, Unix-style, expand it to the |
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403 // user's home directory. If no ~, or no <pwd.h>, just return NAME. |
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404 |
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405 std::string |
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406 file_ops::tilde_expand (const std::string& name) |
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407 { |
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408 std::string result; |
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409 |
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410 size_t name_len = name.length (); |
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411 |
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412 // Scan through S expanding tildes as we come to them. |
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413 |
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414 size_t pos = 0; |
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415 |
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416 while (1) |
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417 { |
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418 if (pos > name_len) |
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419 break; |
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420 |
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421 size_t len; |
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422 |
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423 // Make START point to the tilde which starts the expansion. |
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424 |
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425 size_t start = tilde_find_prefix (name.substr (pos), len); |
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426 |
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427 result.append (name.substr (pos, start)); |
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428 |
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429 // Advance STRING to the starting tilde. |
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430 |
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431 pos += start; |
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432 |
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433 // Make FINI be the index of one after the last character of the |
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434 // username. |
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435 |
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436 size_t fini = tilde_find_suffix (name.substr (pos)); |
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437 |
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3040
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438 // If both START and FINI are zero, we are all done. |
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439 |
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440 if (! (start || fini)) |
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441 break; |
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442 |
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443 // Expand the entire tilde word, and copy it into RESULT. |
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444 |
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445 std::string tilde_word = name.substr (pos, fini); |
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446 |
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447 pos += fini; |
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448 |
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449 std::string expansion = tilde_expand_word (tilde_word); |
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450 |
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451 result.append (expansion); |
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452 } |
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453 |
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454 return result; |
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2926
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455 } |
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456 |
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457 // A vector version of the above. |
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458 |
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459 string_vector |
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460 file_ops::tilde_expand (const string_vector& names) |
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461 { |
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462 string_vector retval; |
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463 |
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464 int n = names.length (); |
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465 |
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466 retval.resize (n); |
|
|
467 |
|
|
468 for (int i = 0; i < n; i++) |
|
|
469 retval[i] = file_ops::tilde_expand (names[i]); |
|
|
470 |
|
|
471 return retval; |
|
|
472 } |
|
1802
|
473 |
|
1765
|
474 int |
|
2926
|
475 file_ops::umask (mode_t mode) |
|
1765
|
476 { |
|
|
477 #if defined (HAVE_UMASK) |
|
2926
|
478 return ::umask (mode); |
|
1765
|
479 #else |
|
|
480 return 0; |
|
|
481 #endif |
|
|
482 } |
|
|
483 |
|
1773
|
484 int |
|
3504
|
485 file_ops::unlink (const std::string& name) |
|
1773
|
486 { |
|
3504
|
487 std::string msg; |
|
2937
|
488 return unlink (name, msg); |
|
1773
|
489 } |
|
|
490 |
|
2668
|
491 int |
|
3504
|
492 file_ops::unlink (const std::string& name, std::string& msg) |
|
2668
|
493 { |
|
3504
|
494 msg = std::string (); |
|
2668
|
495 |
|
2937
|
496 int status = -1; |
|
|
497 |
|
|
498 #if defined (HAVE_UNLINK) |
|
|
499 status = ::unlink (name.c_str ()); |
|
2668
|
500 |
|
|
501 if (status < 0) |
|
3504
|
502 { |
|
|
503 using namespace std; |
|
|
504 msg = ::strerror (errno); |
|
|
505 } |
|
2937
|
506 #else |
|
|
507 msg = NOT_SUPPORTED ("unlink"); |
|
|
508 #endif |
|
2668
|
509 |
|
|
510 return status; |
|
|
511 } |
|
|
512 |
|
1765
|
513 /* |
|
|
514 ;;; Local Variables: *** |
|
|
515 ;;; mode: C++ *** |
|
|
516 ;;; End: *** |
|
|
517 */ |
