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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 <sys/types.h> |
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42 #ifdef HAVE_UNISTD_H |
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43 #include <unistd.h> |
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44 #endif |
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45 #include <errno.h> |
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46 #include <stdio.h> |
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47 #include <stddef.h> |
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48 #include <stdlib.h> |
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49 #include <string.h> |
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50 #include <strstream.h> |
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51 #include <sys/param.h> |
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52 |
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53 // This mess suggested by the autoconf manual. |
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54 // unistd.h defines _POSIX_VERSION on POSIX.1 systems. |
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55 #if defined (HAVE_DIRENT_H) || defined (_POSIX_VERSION) |
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56 #include <dirent.h> |
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57 #define NLENGTH(dirent) (strlen((dirent)->d_name)) |
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958
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58 #else |
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59 #define dirent direct |
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60 #define NLENGTH(dirent) ((dirent)->d_namlen) |
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958
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61 #if defined (HAVE_SYS_NDIR_H) |
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62 #include <sys/ndir.h> |
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958
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63 #endif |
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64 #if defined (HAVE_SYS_DIR_H) |
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65 #include <sys/dir.h> |
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958
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66 #endif |
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67 #if defined (HAVE_NDIR_H) |
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68 #include <ndir.h> |
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958
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69 #endif |
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70 #endif |
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71 |
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72 #include "statdefs.h" |
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73 #include "procstream.h" |
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74 #include "tree-const.h" |
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75 #include "oct-obj.h" |
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76 #include "sysdep.h" |
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77 #include "octave.h" |
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78 #include "dirfns.h" |
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79 #include "pager.h" |
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80 #include "error.h" |
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81 #include "utils.h" |
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82 #include "defun.h" |
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83 |
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84 extern "C" |
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85 { |
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86 #include <readline/tilde.h> |
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87 extern char *strerror (int); |
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88 } |
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89 |
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90 #ifndef MAXPATHLEN |
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91 #define MAXPATHLEN 1024 |
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92 #endif |
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93 |
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94 // Temp storage for a path. |
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95 static char tdir[MAXPATHLEN]; |
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96 |
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97 // Non-zero means follow symbolic links that point to directories just |
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98 // as if they are real directories. |
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99 static int follow_symbolic_links = 1; |
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100 |
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101 // Non-zero means that pwd always give verbatim directory, regardless |
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102 // of symbolic link following. |
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103 static int verbatim_pwd = 1; |
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104 |
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105 // Remove the last N directories from PATH. Do not PATH blank. |
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106 // PATH must contain enough space for MAXPATHLEN characters. |
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107 |
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108 void |
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109 pathname_backup (char *path, int n) |
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110 { |
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111 register char *p; |
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112 |
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113 if (! *path) |
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114 return; |
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115 |
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116 p = path + (strlen (path) - 1); |
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117 |
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118 while (n--) |
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119 { |
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120 while (*p == '/' && p != path) |
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121 p--; |
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122 |
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123 while (*p != '/' && p != path) |
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124 p--; |
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125 |
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126 *++p = '\0'; |
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127 } |
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128 } |
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129 |
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130 // Return a pretty pathname. If the first part of the pathname is the |
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131 // same as $HOME, then replace that with `~'. |
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132 |
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133 char * |
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134 polite_directory_format (char *name) |
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135 { |
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136 int l = home_directory ? strlen (home_directory) : 0; |
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137 |
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138 if (l > 1 && strncmp (home_directory, name, l) == 0 |
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139 && (! name[l] || name[l] == '/')) |
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140 { |
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141 strcpy (tdir + 1, name + l); |
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142 tdir[0] = '~'; |
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143 return (tdir); |
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144 } |
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145 else |
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146 return name; |
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147 } |
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148 |
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149 // Return 1 if STRING contains an absolute pathname, else 0. |
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150 |
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151 int |
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152 absolute_pathname (const char *string) |
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153 { |
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154 if (! string || ! *string) |
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155 return 0; |
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156 |
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157 if (*string == '/') |
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158 return 1; |
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159 |
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160 if (*string++ == '.') |
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161 { |
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162 if ((! *string) || *string == '/') |
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163 return 1; |
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164 |
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165 if (*string++ == '.') |
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166 if (! *string || *string == '/') |
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167 return 1; |
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168 } |
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169 return 0; |
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170 } |
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171 |
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172 // Return 1 if STRING is an absolute program name; it is absolute if |
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173 // it contains any slashes. This is used to decide whether or not to |
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174 // look up through $PATH. |
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175 |
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176 int |
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177 absolute_program (const char *string) |
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178 { |
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179 return (strchr (string, '/') != 0); |
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180 } |
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181 |
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182 // Return the `basename' of the pathname in STRING (the stuff after |
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183 // the last '/'). If STRING is not a full pathname, simply return it. |
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184 |
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185 char * |
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186 base_pathname (char *string) |
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187 { |
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188 char *p = strrchr (string, '/'); |
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189 |
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190 if (! absolute_pathname (string)) |
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191 return (string); |
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192 |
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193 if (p) |
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194 return (++p); |
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195 else |
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196 return (string); |
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197 } |
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198 |
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199 // Turn STRING (a pathname) into an absolute pathname, assuming that |
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200 // DOT_PATH contains the symbolic location of '.'. This always |
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201 // returns a new string, even if STRING was an absolute pathname to |
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202 // begin with. |
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203 |
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204 char * |
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205 make_absolute (const char *string, const char *dot_path) |
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206 { |
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207 static char current_path[MAXPATHLEN]; |
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208 register char *cp; |
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209 |
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210 if (! dot_path || *string == '/') |
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211 return strsave (string); |
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212 |
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213 strcpy (current_path, dot_path); |
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214 |
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215 if (! current_path[0]) |
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216 strcpy (current_path, "./"); |
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217 |
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218 cp = current_path + (strlen (current_path) - 1); |
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219 |
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220 if (*cp++ != '/') |
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221 *cp++ = '/'; |
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222 |
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223 *cp = '\0'; |
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224 |
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225 while (*string) |
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226 { |
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227 if (*string == '.') |
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228 { |
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229 if (! string[1]) |
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230 return strsave (current_path); |
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231 |
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232 if (string[1] == '/') |
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233 { |
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234 string += 2; |
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235 continue; |
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236 } |
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237 |
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238 if (string[1] == '.' && (string[2] == '/' || ! string[2])) |
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239 { |
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240 string += 2; |
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241 |
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242 if (*string) |
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243 string++; |
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244 |
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245 pathname_backup (current_path, 1); |
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246 cp = current_path + strlen (current_path); |
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247 continue; |
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248 } |
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249 } |
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250 |
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251 while (*string && *string != '/') |
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252 *cp++ = *string++; |
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253 |
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254 if (*string) |
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255 *cp++ = *string++; |
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256 |
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257 *cp = '\0'; |
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258 } |
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259 return strsave (current_path); |
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260 } |
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261 |
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262 // Has file `A' been modified after time `T'? |
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263 // |
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264 // case: |
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265 // |
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266 // a newer than t returns 1 |
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267 // a older than t returns 0 |
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268 // stat on a fails returns -1 |
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269 |
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270 int |
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271 is_newer (const char *fa, time_t t) |
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272 { |
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273 struct stat fa_sb; |
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274 register int fa_stat; |
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275 register int status = 0; |
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276 |
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277 fa_stat = stat (fa, &fa_sb); |
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278 if (fa_stat != 0) |
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279 status = -1; |
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280 |
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281 if (status != 0) |
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282 return status; |
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283 |
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284 return (fa_sb.st_mtime > t); |
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285 } |
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286 |
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287 // Return a consed string which is the current working directory. |
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288 // FOR_WHOM is the name of the caller for error printing. |
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289 |
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290 char * |
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291 get_working_directory (const char *for_whom) |
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292 { |
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293 if (! follow_symbolic_links) |
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294 { |
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295 if (the_current_working_directory) |
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296 delete [] the_current_working_directory; |
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297 |
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298 the_current_working_directory = 0; |
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299 } |
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300 |
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301 if (! the_current_working_directory) |
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302 { |
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303 char *directory; |
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304 |
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305 the_current_working_directory = new char [MAXPATHLEN]; |
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306 directory = octave_getcwd (the_current_working_directory, MAXPATHLEN); |
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307 if (! directory) |
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308 { |
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309 message (for_whom, the_current_working_directory); |
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310 delete [] the_current_working_directory; |
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311 the_current_working_directory = 0; |
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312 return 0; |
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313 } |
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314 } |
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315 |
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316 return the_current_working_directory; |
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317 } |
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318 |
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319 // Do the work of changing to the directory NEWDIR. Handle symbolic |
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320 // link following, etc. |
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321 |
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322 static int |
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323 change_to_directory (const char *newdir) |
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324 { |
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325 char *t; |
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326 |
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327 if (follow_symbolic_links) |
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328 { |
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329 if (! the_current_working_directory) |
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330 get_working_directory ("cd_links"); |
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331 |
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332 if (the_current_working_directory) |
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333 t = make_absolute (newdir, the_current_working_directory); |
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334 else |
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335 t = strsave (newdir); |
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336 |
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337 // Get rid of trailing `/'. |
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338 { |
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339 register int len_t = strlen (t); |
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340 if (len_t > 1) |
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341 { |
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342 --len_t; |
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343 if (t[len_t] == '/') |
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344 t[len_t] = '\0'; |
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345 } |
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346 } |
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347 |
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1111
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348 if (octave_chdir (t) < 0) |
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349 { |
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350 delete [] t; |
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351 return 0; |
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352 } |
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353 |
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354 if (the_current_working_directory) |
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355 strcpy (the_current_working_directory, t); |
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356 |
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357 delete [] t; |
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358 return 1; |
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359 } |
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360 else |
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361 { |
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362 if (octave_chdir (newdir) < 0) |
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363 return 0; |
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364 else |
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365 return 1; |
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366 } |
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367 } |
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368 |
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369 DEFUN_TEXT ("cd", Fcd, Scd, 2, 1, |
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370 "cd [dir]\n\ |
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371 \n\ |
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372 change current working directory\n\ |
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373 if no arguments are given, the current directory is changed to the\n\ |
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374 users home directory") |
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375 { |
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376 Octave_object retval; |
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377 |
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378 DEFINE_ARGV("cd"); |
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379 |
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380 if (argc > 1) |
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381 { |
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382 static char *dirname = 0; |
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383 |
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384 if (dirname) |
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385 free (dirname); |
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386 |
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387 dirname = tilde_expand (argv[1]); |
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388 |
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389 if (dirname && ! change_to_directory (dirname)) |
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390 { |
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391 error ("%s: %s", dirname, strerror (errno)); |
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392 DELETE_ARGV; |
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393 return retval; |
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394 } |
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395 } |
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396 else |
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397 { |
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398 if (!home_directory) |
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399 { |
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400 DELETE_ARGV; |
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401 return retval; |
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402 } |
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403 |
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404 if (!change_to_directory (home_directory)) |
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405 { |
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406 error ("%s: %s", home_directory, strerror (errno)); |
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407 DELETE_ARGV; |
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408 return retval; |
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409 } |
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410 } |
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411 |
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412 |
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413 char *directory = get_working_directory ("cd"); |
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414 tree_constant *dir = new tree_constant (directory); |
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415 bind_builtin_variable ("PWD", dir, 1); |
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416 |
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417 DELETE_ARGV; |
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418 |
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419 return retval; |
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420 } |
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421 |
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611
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422 DEFALIAS (chdir, cd); |
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423 |
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661
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424 // Get a directory listing. |
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425 |
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523
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426 DEFUN_TEXT ("ls", Fls, Sls, -1, 1, |
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427 "ls [options]\n\ |
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428 \n\ |
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429 print a directory listing") |
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430 { |
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431 Octave_object retval; |
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432 |
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433 DEFINE_ARGV("ls"); |
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434 |
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435 ostrstream ls_buf; |
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436 |
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437 ls_buf << "ls -C "; |
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438 for (int i = 1; i < argc; i++) |
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1158
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439 { |
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440 char *tmp = tilde_expand (argv[i]); |
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441 ls_buf << tmp << " "; |
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442 free (tmp); |
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443 } |
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523
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444 |
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445 ls_buf << ends; |
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446 |
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447 char *ls_command = ls_buf.str (); |
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448 |
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449 iprocstream cmd (ls_command); |
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450 |
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451 char ch; |
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452 ostrstream output_buf; |
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453 while (cmd.get (ch)) |
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454 output_buf.put (ch); |
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455 |
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456 output_buf << ends; |
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457 |
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458 maybe_page_output (output_buf); |
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459 |
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460 delete [] ls_command; |
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461 |
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462 DELETE_ARGV; |
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463 |
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464 return retval; |
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465 } |
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466 |
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549
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467 DEFALIAS (dir, ls); |
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468 |
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523
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469 DEFUN ("pwd", Fpwd, Spwd, 1, 0, |
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470 "pwd (): print current working directory") |
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471 { |
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472 Octave_object retval; |
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473 char *directory; |
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474 |
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475 if (verbatim_pwd) |
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476 { |
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477 char *buffer = new char [MAXPATHLEN]; |
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1111
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478 directory = octave_getcwd (buffer, MAXPATHLEN); |
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523
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479 |
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480 if (!directory) |
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481 { |
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482 warning ("pwd: can't find working directory!"); |
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483 delete buffer; |
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484 } |
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485 } |
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486 else |
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487 { |
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488 directory = get_working_directory ("pwd"); |
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489 } |
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490 |
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491 if (directory) |
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492 { |
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493 char *s = strconcat (directory, "\n"); |
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494 retval = s; |
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495 delete [] s; |
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496 } |
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497 return retval; |
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498 } |
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499 |
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500 /* |
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501 ;;; Local Variables: *** |
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502 ;;; mode: C++ *** |
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503 ;;; page-delimiter: "^/\\*" *** |
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504 ;;; End: *** |
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505 */ |
