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1 // dirfns.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 /* |
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25 |
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26 The functions listed below were adapted from a similar functions |
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27 from GNU Bash, the Bourne Again SHell, copyright (C) 1987, 1989, 1991 |
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28 Free Software Foundation, Inc. |
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29 |
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30 polite_directory_format absolute_pathname |
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31 absolute_program base_pathname |
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32 make_absolute pathname_backup |
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33 change_to_directory get_working_directory |
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34 |
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35 */ |
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36 |
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37 #ifdef HAVE_CONFIG_H |
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38 #include <config.h> |
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39 #endif |
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40 |
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41 #include <cerrno> |
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42 #include <cstdio> |
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43 #include <cstddef> |
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44 #include <cstdlib> |
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45 #include <cstring> |
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46 |
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47 #include <string> |
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48 |
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49 #include <strstream.h> |
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50 |
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51 #include "str-vec.h" |
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52 |
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53 #include "defun.h" |
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54 #include "dirfns.h" |
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55 #include "error.h" |
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56 #include "gripes.h" |
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57 #include "help.h" |
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58 #include "oct-obj.h" |
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59 #include "pager.h" |
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60 #include "pathlen.h" |
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61 #include "procstream.h" |
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62 #include "pt-plot.h" |
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63 #include "statdefs.h" |
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64 #include "sysdep.h" |
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65 #include "sysdir.h" |
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66 #include "toplev.h" |
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67 #include "unwind-prot.h" |
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68 #include "utils.h" |
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69 #include "variables.h" |
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70 |
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71 // Non-zero means follow symbolic links that point to directories just |
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72 // as if they are real directories. |
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73 static int follow_symbolic_links = 1; |
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74 |
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75 // Non-zero means that pwd always give verbatim directory, regardless |
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76 // of symbolic link following. |
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77 static int verbatim_pwd = 1; |
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78 |
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79 // Remove the last N directories from PATH. Do not PATH blank. |
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80 // PATH must contain enough space for MAXPATHLEN characters. |
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81 |
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82 static void |
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83 pathname_backup (string& path, int n) |
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84 { |
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85 if (path.empty ()) |
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86 return; |
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87 |
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88 size_t i = path.length () - 1; |
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89 |
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90 while (n--) |
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91 { |
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92 while (path[i] == '/' && i > 0) |
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93 i--; |
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94 |
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95 while (path[i] != '/' && i > 0) |
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96 i--; |
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97 |
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98 i++; |
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99 } |
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100 |
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101 path.resize (i); |
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102 } |
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103 |
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104 // Return a pretty pathname. If the first part of the pathname is the |
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105 // same as $HOME, then replace that with `~'. |
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106 |
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107 string |
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108 polite_directory_format (const string& name) |
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109 { |
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110 string retval; |
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111 |
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112 size_t len = home_directory.length (); |
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113 |
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114 if (len > 1 && home_directory.compare (name, 0, len) == 0 |
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115 && (name.length () == len || name[len] == '/')) |
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116 { |
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117 retval = "~"; |
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118 retval.append (name.substr (len)); |
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119 } |
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120 else |
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121 retval = name; |
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122 |
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123 return retval; |
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124 } |
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125 |
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126 // Return 1 if STRING contains an absolute pathname, else 0. |
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127 |
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128 int |
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129 absolute_pathname (const string& s) |
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130 { |
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131 if (s.empty ()) |
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132 return 0; |
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133 |
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134 if (s[0] == '/') |
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135 return 1; |
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136 |
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137 if (s[0] == '.') |
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138 { |
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139 if (s[1] == '\0' || s[1] == '/') |
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140 return 1; |
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141 |
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142 if (s[1] == '.') |
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143 if (s[2] == '\0' || s[2] == '/') |
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144 return 1; |
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145 } |
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146 |
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147 return 0; |
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148 } |
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149 |
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150 // Return 1 if STRING is an absolute program name; it is absolute if |
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151 // it contains any slashes. This is used to decide whether or not to |
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152 // look up through $PATH. |
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153 |
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154 int |
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155 absolute_program (const string& s) |
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156 { |
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157 return (s.find ('/') != NPOS); |
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158 } |
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159 |
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160 // Return the `basename' of the pathname in STRING (the stuff after |
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161 // the last '/'). If STRING is not a full pathname, simply return it. |
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162 |
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163 string |
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164 base_pathname (const string& s) |
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165 { |
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166 if (! absolute_pathname (s)) |
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167 return s; |
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168 |
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169 size_t pos = s.rfind ('/'); |
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170 |
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171 if (pos == NPOS) |
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172 return s; |
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173 else |
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174 return s.substr (pos+1); |
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175 } |
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176 |
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177 // Turn STRING (a pathname) into an absolute pathname, assuming that |
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178 // DOT_PATH contains the symbolic location of '.'. |
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179 |
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180 string |
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181 make_absolute (const string& s, const string& dot_path) |
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182 { |
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183 if (dot_path.empty () || s[0] == '/') |
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184 return s; |
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185 |
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186 string current_path = dot_path; |
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187 |
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188 if (current_path.empty ()) |
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189 current_path = "./"; |
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190 |
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191 size_t pos = current_path.length () - 1; |
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192 |
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193 if (current_path[pos] != '/') |
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194 current_path.append ("/"); |
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195 |
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196 size_t i = 0; |
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197 size_t slen = s.length (); |
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198 |
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199 while (i < slen) |
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200 { |
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201 if (s[i] == '.') |
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202 { |
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203 if (i + 1 == slen) |
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204 return current_path; |
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205 |
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206 if (s[i+1] == '/') |
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207 { |
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208 i += 2; |
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209 continue; |
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210 } |
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211 |
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212 if (s[i+1] == '.' && (i + 2 == slen || s[i+2] == '/')) |
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213 { |
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214 i += 2; |
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215 |
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216 if (i != slen) |
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217 i++; |
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218 |
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219 pathname_backup (current_path, 1); |
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220 |
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221 continue; |
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222 } |
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223 } |
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224 |
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225 size_t tmp = s.find ('/', i); |
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226 |
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227 if (tmp == NPOS) |
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228 { |
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229 current_path.append (s, i, tmp-i); |
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230 break; |
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231 } |
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232 else |
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233 { |
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234 current_path.append (s, i, tmp-i+1); |
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235 i = tmp + 1; |
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236 } |
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237 } |
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238 |
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239 return current_path; |
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240 } |
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241 |
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242 // Has file `A' been modified after time `T'? |
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243 // |
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244 // case: |
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245 // |
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246 // a newer than t returns 1 |
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247 // a older than t returns 0 |
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248 // stat on a fails returns -1 |
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249 |
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250 int |
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251 is_newer (const string& fa, time_t t) |
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252 { |
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253 struct stat fa_sb; |
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254 register int fa_stat; |
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255 register int status = 0; |
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256 |
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257 fa_stat = stat (fa.c_str (), &fa_sb); |
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258 if (fa_stat != 0) |
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259 status = -1; |
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260 |
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261 if (status != 0) |
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262 return status; |
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263 |
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264 return (fa_sb.st_mtime > t); |
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265 } |
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266 |
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267 // Return a consed string which is the current working directory. |
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268 // FOR_WHOM is the name of the caller for error printing. |
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269 |
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270 string |
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271 get_working_directory (const string& for_whom) |
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272 { |
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273 if (! follow_symbolic_links) |
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274 the_current_working_directory = ""; |
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275 |
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276 if (the_current_working_directory.empty ()) |
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277 { |
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278 the_current_working_directory = octave_getcwd (); |
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279 |
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280 if (the_current_working_directory.empty ()) |
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281 warning ("%s: can't find current directory!", for_whom.c_str ()); |
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282 } |
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283 |
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284 return the_current_working_directory; |
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285 } |
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286 |
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287 // Do the work of changing to the directory NEWDIR. Handle symbolic |
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288 // link following, etc. |
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289 |
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290 static int |
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291 change_to_directory (const string& newdir) |
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292 { |
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293 string tmp; |
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294 |
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295 if (follow_symbolic_links) |
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296 { |
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297 if (the_current_working_directory.empty ()) |
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298 get_working_directory ("cd_links"); |
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299 |
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300 if (the_current_working_directory.empty ()) |
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301 tmp = newdir; |
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302 else |
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303 tmp = make_absolute (newdir, the_current_working_directory); |
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304 |
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305 // Get rid of trailing `/'. |
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306 |
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307 size_t len = tmp.length (); |
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308 |
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309 if (len > 1) |
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310 { |
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311 if (tmp[--len] == '/') |
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312 tmp.resize (len); |
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313 } |
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314 |
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315 if (octave_chdir (tmp) < 0) |
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316 return 0; |
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317 else |
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318 { |
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319 the_current_working_directory = tmp; |
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320 return 1; |
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321 } |
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322 } |
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323 else |
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324 return (octave_chdir (newdir) < 0) ? 0 : 1; |
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325 } |
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326 |
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327 static int |
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328 octave_change_to_directory (const string& newdir) |
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329 { |
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330 int cd_ok = change_to_directory (newdir); |
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331 |
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332 if (cd_ok) |
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333 do_external_plotter_cd (newdir); |
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334 else |
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335 error ("%s: %s", newdir.c_str (), strerror (errno)); |
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336 |
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337 return cd_ok; |
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338 } |
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339 |
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340 DEFUN_TEXT ("cd", Fcd, Scd, 10, |
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341 "cd [dir]\n\ |
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342 \n\ |
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343 change current working directory\n\ |
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344 if no arguments are given, the current directory is changed to the\n\ |
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345 users home directory") |
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346 { |
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347 Octave_object retval; |
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348 |
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349 int argc = args.length () + 1; |
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350 |
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351 string_vector argv = make_argv (args, "cd"); |
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352 |
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353 if (error_state) |
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354 return retval; |
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355 |
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356 if (argc > 1) |
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357 { |
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358 string dirname = oct_tilde_expand (argv[1]); |
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359 |
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360 if (dirname.length () > 0 |
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361 && ! octave_change_to_directory (dirname)) |
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362 { |
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363 return retval; |
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364 } |
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365 } |
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366 else |
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367 { |
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368 if (home_directory.empty () |
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369 || ! octave_change_to_directory (home_directory)) |
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370 { |
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371 return retval; |
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372 } |
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373 } |
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374 |
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375 string directory = get_working_directory ("cd"); |
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376 tree_constant *dir = new tree_constant (directory); |
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377 bind_builtin_variable ("PWD", dir, 1); |
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378 |
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379 return retval; |
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380 } |
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381 |
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611
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382 DEFALIAS (chdir, cd); |
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383 |
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661
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384 // Get a directory listing. |
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385 |
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386 DEFUN_TEXT ("ls", Fls, Sls, 10, |
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387 "ls [options]\n\ |
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388 \n\ |
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389 print a directory listing") |
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390 { |
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391 Octave_object retval; |
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392 |
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393 int argc = args.length () + 1; |
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394 |
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395 string_vector argv = make_argv (args, "ls"); |
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396 |
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397 if (error_state) |
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398 return retval; |
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523
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399 |
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400 ostrstream ls_buf; |
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401 |
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402 ls_buf << "ls -C "; |
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403 for (int i = 1; i < argc; i++) |
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404 ls_buf << oct_tilde_expand (argv[i]) << " "; |
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523
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405 |
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406 ls_buf << ends; |
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407 char *ls_command = ls_buf.str (); |
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523
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408 |
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1449
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409 iprocstream *cmd = new iprocstream (ls_command); |
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523
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410 |
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1469
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411 delete [] ls_command; |
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412 |
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1449
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413 add_unwind_protect (cleanup_iprocstream, cmd); |
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523
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414 |
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1449
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415 if (cmd && *cmd) |
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416 { |
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417 int ch; |
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418 ostrstream output_buf; |
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419 while ((ch = cmd->get ()) != EOF) |
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420 output_buf << (char) ch; |
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421 output_buf << ends; |
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523
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422 |
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1449
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423 maybe_page_output (output_buf); |
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424 } |
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425 else |
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426 error ("couldn't start process for ls!"); |
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523
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427 |
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1449
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428 run_unwind_protect (); |
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523
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429 |
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430 return retval; |
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431 } |
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432 |
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549
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433 DEFALIAS (dir, ls); |
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434 |
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1592
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435 DEFUN ("pwd", Fpwd, Spwd, 01, |
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523
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436 "pwd (): print current working directory") |
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437 { |
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438 Octave_object retval; |
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1755
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439 string directory; |
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523
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440 |
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441 if (verbatim_pwd) |
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442 { |
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1755
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443 directory = octave_getcwd (); |
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523
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444 |
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1755
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445 if (directory.empty ()) |
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446 warning ("pwd: can't find working directory!"); |
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523
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447 } |
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448 else |
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1755
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449 directory = get_working_directory ("pwd"); |
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523
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450 |
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1755
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451 if (! directory.empty ()) |
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523
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452 { |
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1592
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453 if (nargout == 0) |
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454 { |
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455 ostrstream output_buf; |
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456 output_buf << directory << "\n" << ends; |
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457 maybe_page_output (output_buf); |
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458 } |
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459 else |
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460 retval = directory; |
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523
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461 } |
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1592
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462 |
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523
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463 return retval; |
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|
464 } |
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465 |
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1488
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466 DEFUN ("readdir", Freaddir, Sreaddir, 10, |
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1389
|
467 "readdir (NAME)\n\ |
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468 \n\ |
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|
469 Return an array of strings containing the list of all files in the |
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1401
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470 named directory. If sucessful, returns 0; otherwise an error message |
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471 is printed.") |
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1389
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472 { |
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473 Octave_object retval; |
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1572
|
474 charMatrix dirlist; |
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1389
|
475 int status = 0; |
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|
476 |
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1401
|
477 if (args.length () == 1) |
|
1389
|
478 { |
|
1755
|
479 string dirname = args(0).string_value (); |
|
1389
|
480 |
|
1401
|
481 if (error_state) |
|
1389
|
482 { |
|
1401
|
483 status = -1; |
|
1402
|
484 gripe_wrong_type_arg ("readdir", args(0)); |
|
1401
|
485 } |
|
|
486 else |
|
|
487 { |
|
1750
|
488 string tmp = oct_tilde_expand (dirname); |
|
1489
|
489 |
|
1750
|
490 DIR *dir = opendir (tmp.c_str ()); |
|
1389
|
491 |
|
1401
|
492 if (dir) |
|
1389
|
493 { |
|
1401
|
494 int count = 0; |
|
1572
|
495 int max_len = 0; |
|
|
496 |
|
|
497 struct dirent *dir_entry; |
|
|
498 |
|
|
499 while ((dir_entry = readdir (dir))) |
|
|
500 { |
|
|
501 count++; |
|
|
502 int len = strlen (dir_entry->d_name); |
|
|
503 if (len > max_len) |
|
|
504 max_len = len; |
|
|
505 } |
|
1401
|
506 |
|
|
507 rewinddir (dir); |
|
|
508 |
|
1572
|
509 dirlist.resize (count, max_len, 0); |
|
1389
|
510 |
|
1401
|
511 while ((dir_entry = readdir (dir))) |
|
|
512 { |
|
|
513 if (--count < 0) |
|
|
514 break; |
|
|
515 |
|
1572
|
516 dirlist.insert (dir_entry->d_name, count, 0); |
|
1401
|
517 } |
|
1389
|
518 |
|
|
519 #if defined (CLOSEDIR_VOID) |
|
1401
|
520 closedir (dir); |
|
1389
|
521 #else |
|
1401
|
522 if (closedir (dir) < 0) |
|
|
523 { |
|
|
524 status = -1; |
|
|
525 error ("%s", strerror (errno)); |
|
|
526 } |
|
1389
|
527 #endif |
|
|
528 |
|
1401
|
529 if (count != 0) |
|
|
530 { |
|
|
531 status = -1; |
|
|
532 error ("readdir: failed reading directory"); |
|
|
533 } |
|
|
534 } |
|
|
535 else |
|
|
536 { |
|
|
537 status = -1; |
|
|
538 error ("%s", strerror (errno)); |
|
|
539 } |
|
1389
|
540 } |
|
|
541 } |
|
|
542 else |
|
|
543 print_usage ("readdir"); |
|
|
544 |
|
1401
|
545 if (status == 0) |
|
1572
|
546 retval(0) = tree_constant (dirlist, 1); |
|
1401
|
547 |
|
|
548 return retval; |
|
|
549 } |
|
|
550 |
|
|
551 // XXX FIXME XXX -- should probably also allow second arg to specify |
|
|
552 // mode. |
|
|
553 |
|
1488
|
554 DEFUN ("mkdir", Fmkdir, Smkdir, 10, |
|
1401
|
555 "mkdir (NAME)\n\ |
|
|
556 \n\ |
|
|
557 Create the directory named by NAME. If successful, returns 0;\n\ |
|
|
558 otherwise prints an error message.") |
|
|
559 { |
|
|
560 Octave_object retval; |
|
|
561 |
|
|
562 int status = 0; |
|
|
563 |
|
|
564 if (args.length () == 1) |
|
|
565 { |
|
1755
|
566 string dirname = args(0).string_value (); |
|
1401
|
567 |
|
|
568 if (error_state) |
|
1402
|
569 gripe_wrong_type_arg ("mkdir", args(0)); |
|
1489
|
570 else |
|
1401
|
571 { |
|
1750
|
572 string tmp = oct_tilde_expand (dirname); |
|
1489
|
573 |
|
1750
|
574 int mkdir_retval = mkdir (tmp.c_str (), 0777); |
|
1489
|
575 |
|
|
576 if (mkdir_retval < 0) |
|
|
577 { |
|
|
578 status = -1; |
|
|
579 error ("%s", strerror (errno)); |
|
|
580 } |
|
1401
|
581 } |
|
|
582 } |
|
|
583 else |
|
|
584 print_usage ("mkdir"); |
|
|
585 |
|
|
586 if (status == 0) |
|
1389
|
587 retval (0) = (double) status; |
|
1401
|
588 |
|
|
589 return retval; |
|
|
590 } |
|
|
591 |
|
1488
|
592 DEFUN ("rmdir", Frmdir, Srmdir, 10, |
|
1401
|
593 "rmdir (NAME)\n\ |
|
|
594 \n\ |
|
|
595 Remove the directory named by NAME. If successful, returns 0;\n\ |
|
|
596 otherwise prints an error message.") |
|
|
597 { |
|
|
598 Octave_object retval; |
|
|
599 |
|
|
600 int status = 0; |
|
|
601 |
|
|
602 if (args.length () == 1) |
|
|
603 { |
|
1755
|
604 string dirname = args(0).string_value (); |
|
1401
|
605 |
|
|
606 if (error_state) |
|
1402
|
607 gripe_wrong_type_arg ("rmdir", args(0)); |
|
1489
|
608 else |
|
1401
|
609 { |
|
1750
|
610 string tmp = oct_tilde_expand (dirname); |
|
1489
|
611 |
|
1750
|
612 int rmdir_retval = rmdir (tmp.c_str ()); |
|
1489
|
613 |
|
|
614 if (rmdir_retval < 0) |
|
|
615 { |
|
|
616 status = -1; |
|
|
617 error ("%s", strerror (errno)); |
|
|
618 } |
|
1401
|
619 } |
|
|
620 } |
|
1389
|
621 else |
|
1401
|
622 print_usage ("rmdir"); |
|
|
623 |
|
|
624 if (status == 0) |
|
|
625 retval (0) = (double) status; |
|
|
626 |
|
|
627 return retval; |
|
|
628 } |
|
|
629 |
|
1488
|
630 DEFUN ("rename", Frename, Srename, 10, |
|
1401
|
631 "rename (FROM, TO)\n\ |
|
|
632 \n\ |
|
|
633 Rename a file. If successful, returns 0;\n\ |
|
|
634 otherwise prints an error message and returns -1.") |
|
|
635 { |
|
|
636 Octave_object retval; |
|
|
637 |
|
|
638 int status = 0; |
|
|
639 |
|
|
640 if (args.length () == 2) |
|
|
641 { |
|
1755
|
642 string from = args(0).string_value (); |
|
1728
|
643 |
|
1401
|
644 if (error_state) |
|
1402
|
645 gripe_wrong_type_arg ("rename", args(0)); |
|
|
646 else |
|
1401
|
647 { |
|
1755
|
648 string to = args(1).string_value (); |
|
1728
|
649 |
|
1402
|
650 if (error_state) |
|
|
651 gripe_wrong_type_arg ("rename", args(1)); |
|
1755
|
652 else if (rename (from.c_str (), to.c_str ()) < 0) |
|
1402
|
653 { |
|
|
654 status = -1; |
|
|
655 error ("%s", strerror (errno)); |
|
|
656 } |
|
1401
|
657 } |
|
|
658 } |
|
|
659 else |
|
|
660 print_usage ("rename"); |
|
|
661 |
|
|
662 if (status == 0) |
|
|
663 retval (0) = (double) status; |
|
1389
|
664 |
|
|
665 return retval; |
|
|
666 } |
|
|
667 |
|
523
|
668 /* |
|
|
669 ;;; Local Variables: *** |
|
|
670 ;;; mode: C++ *** |
|
|
671 ;;; page-delimiter: "^/\\*" *** |
|
|
672 ;;; End: *** |
|
|
673 */ |
