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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, 675 Mass Ave, Cambridge, MA 02139, 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 "octave.h" |
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77 #include "dirfns.h" |
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78 #include "pager.h" |
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79 #include "error.h" |
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80 #include "utils.h" |
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81 #include "defun.h" |
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82 |
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83 extern "C" |
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84 { |
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85 #include <readline/tilde.h> |
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86 extern char *strerror (int); |
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87 } |
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88 |
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89 #ifndef MAXPATHLEN |
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90 #define MAXPATHLEN 1024 |
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91 #endif |
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92 |
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93 // Temp storage for a path. |
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94 static char tdir[MAXPATHLEN]; |
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95 |
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96 // Non-zero means follow symbolic links that point to directories just |
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97 // as if they are real directories. |
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98 static int follow_symbolic_links = 1; |
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99 |
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100 // Non-zero means that pwd always give verbatim directory, regardless |
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101 // of symbolic link following. |
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102 static int verbatim_pwd = 1; |
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103 |
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104 // Remove the last N directories from PATH. Do not PATH blank. |
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105 // PATH must contain enough space for MAXPATHLEN characters. |
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106 |
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107 void |
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108 pathname_backup (char *path, int n) |
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109 { |
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110 register char *p; |
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111 |
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112 if (! *path) |
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113 return; |
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114 |
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115 p = path + (strlen (path) - 1); |
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116 |
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117 while (n--) |
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118 { |
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119 while (*p == '/' && p != path) |
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120 p--; |
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121 |
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122 while (*p != '/' && p != path) |
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123 p--; |
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124 |
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125 *++p = '\0'; |
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126 } |
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127 } |
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128 |
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129 // Return a pretty pathname. If the first part of the pathname is the |
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130 // same as $HOME, then replace that with `~'. |
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131 |
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132 char * |
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133 polite_directory_format (char *name) |
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134 { |
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135 int l = home_directory ? strlen (home_directory) : 0; |
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136 |
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137 if (l > 1 && strncmp (home_directory, name, l) == 0 |
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138 && (! name[l] || name[l] == '/')) |
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139 { |
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140 strcpy (tdir + 1, name + l); |
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141 tdir[0] = '~'; |
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142 return (tdir); |
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143 } |
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144 else |
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145 return name; |
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146 } |
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147 |
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148 // Return 1 if STRING contains an absolute pathname, else 0. |
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149 |
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150 int |
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151 absolute_pathname (const char *string) |
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152 { |
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153 if (! string || ! *string) |
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154 return 0; |
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155 |
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156 if (*string == '/') |
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157 return 1; |
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158 |
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159 if (*string++ == '.') |
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160 { |
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161 if ((! *string) || *string == '/') |
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162 return 1; |
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163 |
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164 if (*string++ == '.') |
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165 if (! *string || *string == '/') |
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166 return 1; |
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167 } |
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168 return 0; |
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169 } |
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170 |
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171 // Return 1 if STRING is an absolute program name; it is absolute if |
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172 // it contains any slashes. This is used to decide whether or not to |
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173 // look up through $PATH. |
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174 |
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175 int |
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176 absolute_program (const char *string) |
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177 { |
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178 return (strchr (string, '/') != 0); |
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179 } |
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180 |
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181 // Return the `basename' of the pathname in STRING (the stuff after |
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182 // the last '/'). If STRING is not a full pathname, simply return it. |
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183 |
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184 char * |
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185 base_pathname (char *string) |
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186 { |
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187 char *p = strrchr (string, '/'); |
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188 |
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189 if (! absolute_pathname (string)) |
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190 return (string); |
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191 |
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192 if (p) |
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193 return (++p); |
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194 else |
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195 return (string); |
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196 } |
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197 |
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198 // Turn STRING (a pathname) into an absolute pathname, assuming that |
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199 // DOT_PATH contains the symbolic location of '.'. This always |
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200 // returns a new string, even if STRING was an absolute pathname to |
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201 // begin with. |
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202 |
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203 char * |
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204 make_absolute (const char *string, const char *dot_path) |
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205 { |
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206 static char current_path[MAXPATHLEN]; |
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207 register char *cp; |
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208 |
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209 if (! dot_path || *string == '/') |
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210 return strsave (string); |
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211 |
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212 strcpy (current_path, dot_path); |
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213 |
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214 if (! current_path[0]) |
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215 strcpy (current_path, "./"); |
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216 |
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217 cp = current_path + (strlen (current_path) - 1); |
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218 |
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219 if (*cp++ != '/') |
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220 *cp++ = '/'; |
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221 |
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222 *cp = '\0'; |
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223 |
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224 while (*string) |
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225 { |
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226 if (*string == '.') |
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227 { |
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228 if (! string[1]) |
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229 return strsave (current_path); |
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230 |
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231 if (string[1] == '/') |
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232 { |
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233 string += 2; |
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234 continue; |
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235 } |
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236 |
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237 if (string[1] == '.' && (string[2] == '/' || ! string[2])) |
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238 { |
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239 string += 2; |
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240 |
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241 if (*string) |
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242 string++; |
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243 |
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244 pathname_backup (current_path, 1); |
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245 cp = current_path + strlen (current_path); |
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246 continue; |
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247 } |
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248 } |
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249 |
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250 while (*string && *string != '/') |
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251 *cp++ = *string++; |
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252 |
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253 if (*string) |
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254 *cp++ = *string++; |
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255 |
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256 *cp = '\0'; |
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257 } |
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258 return strsave (current_path); |
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259 } |
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260 |
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261 // Has file `A' been modified after time `T'? |
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262 // |
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263 // case: |
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264 // |
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265 // a newer than t returns 1 |
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266 // a older than t returns 0 |
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267 // stat on a fails returns -1 |
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268 |
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269 int |
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270 is_newer (const char *fa, time_t t) |
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271 { |
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272 struct stat fa_sb; |
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273 register int fa_stat; |
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274 register int status = 0; |
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275 |
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276 fa_stat = stat (fa, &fa_sb); |
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277 if (fa_stat != 0) |
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278 status = -1; |
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279 |
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280 if (status != 0) |
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281 return status; |
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282 |
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283 return (fa_sb.st_mtime > t); |
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284 } |
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285 |
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286 // Return a consed string which is the current working directory. |
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287 // FOR_WHOM is the name of the caller for error printing. |
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288 |
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289 char * |
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290 get_working_directory (const char *for_whom) |
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291 { |
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292 if (! follow_symbolic_links) |
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293 { |
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294 if (the_current_working_directory) |
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295 delete [] the_current_working_directory; |
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296 |
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297 the_current_working_directory = 0; |
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298 } |
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299 |
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300 if (! the_current_working_directory) |
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301 { |
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302 char *directory; |
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303 |
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304 the_current_working_directory = new char [MAXPATHLEN]; |
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305 directory = getcwd (the_current_working_directory, MAXPATHLEN); |
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306 if (! directory) |
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307 { |
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308 message (for_whom, the_current_working_directory); |
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309 delete [] the_current_working_directory; |
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310 the_current_working_directory = 0; |
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311 return 0; |
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312 } |
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313 } |
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314 |
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315 return the_current_working_directory; |
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316 } |
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317 |
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318 // Do the work of changing to the directory NEWDIR. Handle symbolic |
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319 // link following, etc. |
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320 |
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321 static int |
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322 change_to_directory (const char *newdir) |
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323 { |
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324 char *t; |
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325 |
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326 if (follow_symbolic_links) |
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327 { |
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328 if (! the_current_working_directory) |
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329 get_working_directory ("cd_links"); |
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330 |
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331 if (the_current_working_directory) |
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332 t = make_absolute (newdir, the_current_working_directory); |
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333 else |
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334 t = strsave (newdir); |
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335 |
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336 // Get rid of trailing `/'. |
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337 { |
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338 register int len_t = strlen (t); |
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339 if (len_t > 1) |
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340 { |
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341 --len_t; |
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342 if (t[len_t] == '/') |
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343 t[len_t] = '\0'; |
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344 } |
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345 } |
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346 |
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347 if (chdir (t) < 0) |
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348 { |
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349 delete [] t; |
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350 return 0; |
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351 } |
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352 |
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353 if (the_current_working_directory) |
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354 strcpy (the_current_working_directory, t); |
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355 |
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356 delete [] t; |
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357 return 1; |
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358 } |
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359 else |
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360 { |
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361 if (chdir (newdir) < 0) |
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362 return 0; |
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363 else |
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364 return 1; |
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365 } |
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366 } |
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367 |
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368 DEFUN_TEXT ("cd", Fcd, Scd, 2, 1, |
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369 "cd [dir]\n\ |
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370 \n\ |
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371 change current working directory\n\ |
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372 if no arguments are given, the current directory is changed to the\n\ |
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373 users home directory") |
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374 { |
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375 Octave_object retval; |
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376 |
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377 DEFINE_ARGV("cd"); |
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378 |
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379 if (argc > 1) |
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380 { |
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381 static char *dirname = 0; |
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382 |
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383 if (dirname) |
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384 free (dirname); |
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385 |
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386 dirname = tilde_expand (argv[1]); |
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387 |
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388 if (dirname && ! change_to_directory (dirname)) |
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389 { |
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390 error ("%s: %s", dirname, strerror (errno)); |
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391 DELETE_ARGV; |
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392 return retval; |
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393 } |
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394 } |
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395 else |
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396 { |
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397 if (!home_directory) |
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398 { |
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399 DELETE_ARGV; |
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400 return retval; |
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401 } |
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402 |
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403 if (!change_to_directory (home_directory)) |
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404 { |
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405 error ("%s: %s", home_directory, strerror (errno)); |
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406 DELETE_ARGV; |
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407 return retval; |
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408 } |
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409 } |
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410 |
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411 |
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412 char *directory = get_working_directory ("cd"); |
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413 tree_constant *dir = new tree_constant (directory); |
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414 bind_builtin_variable ("PWD", dir, 1); |
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415 |
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416 DELETE_ARGV; |
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417 |
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418 return retval; |
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419 } |
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420 |
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421 DEFALIAS (chdir, cd); |
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422 |
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661
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423 // Get a directory listing. |
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424 |
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523
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425 DEFUN_TEXT ("ls", Fls, Sls, -1, 1, |
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426 "ls [options]\n\ |
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427 \n\ |
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428 print a directory listing") |
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429 { |
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430 Octave_object retval; |
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431 |
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432 DEFINE_ARGV("ls"); |
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433 |
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434 ostrstream ls_buf; |
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435 |
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436 ls_buf << "ls -C "; |
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437 for (int i = 1; i < argc; i++) |
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438 ls_buf << tilde_expand (argv[i]) << " "; |
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439 |
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440 ls_buf << ends; |
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441 |
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442 char *ls_command = ls_buf.str (); |
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443 |
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444 iprocstream cmd (ls_command); |
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445 |
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446 char ch; |
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447 ostrstream output_buf; |
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448 while (cmd.get (ch)) |
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449 output_buf.put (ch); |
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450 |
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451 output_buf << ends; |
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452 |
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453 maybe_page_output (output_buf); |
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454 |
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455 delete [] ls_command; |
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456 |
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457 DELETE_ARGV; |
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458 |
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459 return retval; |
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460 } |
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461 |
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549
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462 DEFALIAS (dir, ls); |
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463 |
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523
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464 DEFUN ("pwd", Fpwd, Spwd, 1, 0, |
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465 "pwd (): print current working directory") |
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466 { |
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467 Octave_object retval; |
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468 char *directory; |
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469 |
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470 if (verbatim_pwd) |
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471 { |
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472 char *buffer = new char [MAXPATHLEN]; |
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473 directory = getcwd (buffer, MAXPATHLEN); |
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474 |
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475 if (!directory) |
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476 { |
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477 warning ("pwd: can't find working directory!"); |
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478 delete buffer; |
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479 } |
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480 } |
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481 else |
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482 { |
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483 directory = get_working_directory ("pwd"); |
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484 } |
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485 |
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486 if (directory) |
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487 { |
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488 char *s = strconcat (directory, "\n"); |
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489 retval = s; |
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490 delete [] s; |
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491 } |
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492 return retval; |
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493 } |
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494 |
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495 /* |
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496 ;;; Local Variables: *** |
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497 ;;; mode: C++ *** |
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498 ;;; page-delimiter: "^/\\*" *** |
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499 ;;; End: *** |
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500 */ |
