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523
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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 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 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include <sys/types.h> |
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29 #ifdef HAVE_UNISTD_H |
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30 #include <unistd.h> |
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31 #endif |
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32 #include <string.h> |
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33 #include <strstream.h> |
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34 #include <sys/param.h> |
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35 #include <errno.h> |
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36 |
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37 // This mess suggested by the autoconf manual. |
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38 // unistd.h defines _POSIX_VERSION on POSIX.1 systems. |
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39 #if defined(DIRENT) || defined(_POSIX_VERSION) |
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40 #include <dirent.h> |
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41 #define NLENGTH(dirent) (strlen((dirent)->d_name)) |
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42 #else /* not (DIRENT or _POSIX_VERSION) */ |
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43 #define dirent direct |
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44 #define NLENGTH(dirent) ((dirent)->d_namlen) |
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45 #ifdef SYSNDIR |
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46 #include <sys/ndir.h> |
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47 #endif /* SYSNDIR */ |
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48 #ifdef SYSDIR |
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49 #include <sys/dir.h> |
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50 #endif /* SYSDIR */ |
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51 #ifdef NDIR |
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52 #include <ndir.h> |
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53 #endif /* NDIR */ |
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54 #endif /* not (DIRENT or _POSIX_VERSION) */ |
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55 |
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56 #include "statdefs.h" |
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57 #include "procstream.h" |
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58 #include "tree-const.h" |
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59 #include "oct-obj.h" |
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60 #include "octave.h" |
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61 #include "dirfns.h" |
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62 #include "pager.h" |
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63 #include "error.h" |
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64 #include "utils.h" |
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65 #include "defun.h" |
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66 |
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67 extern "C" |
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68 { |
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69 #include <readline/tilde.h> |
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70 extern char *strerror (int); |
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71 } |
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72 |
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73 #ifndef MAXPATHLEN |
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74 #define MAXPATHLEN 1024 |
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75 #endif |
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76 |
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77 // Temp storage for a path. |
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78 static char tdir[MAXPATHLEN]; |
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79 |
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80 // Non-zero means follow symbolic links that point to directories just |
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81 // as if they are real directories. |
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82 static int follow_symbolic_links = 1; |
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83 |
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84 // Non-zero means that pwd always give verbatim directory, regardless |
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85 // of symbolic link following. |
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86 static int verbatim_pwd = 1; |
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87 |
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88 /* |
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89 * Remove the last N directories from PATH. Do not PATH blank. |
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90 * PATH must contain enough space for MAXPATHLEN characters. |
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91 */ |
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92 void |
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93 pathname_backup (char *path, int n) |
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94 { |
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95 register char *p; |
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96 |
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97 if (! *path) |
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98 return; |
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99 |
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100 p = path + (strlen (path) - 1); |
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101 |
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102 while (n--) |
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103 { |
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104 while (*p == '/' && p != path) |
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105 p--; |
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106 |
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107 while (*p != '/' && p != path) |
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108 p--; |
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109 |
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110 *++p = '\0'; |
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111 } |
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112 } |
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113 |
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114 /* |
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115 * Return a pretty pathname. If the first part of the pathname is the |
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116 * same as $HOME, then replace that with `~'. |
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117 */ |
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118 char * |
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119 polite_directory_format (char *name) |
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120 { |
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121 int l = home_directory ? strlen (home_directory) : 0; |
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122 |
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123 if (l > 1 && strncmp (home_directory, name, l) == 0 |
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124 && (! name[l] || name[l] == '/')) |
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125 { |
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126 strcpy (tdir + 1, name + l); |
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127 tdir[0] = '~'; |
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128 return (tdir); |
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129 } |
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130 else |
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131 return name; |
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132 } |
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133 |
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134 /* |
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135 * Return 1 if STRING contains an absolute pathname, else 0. |
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136 */ |
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137 int |
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138 absolute_pathname (const char *string) |
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139 { |
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140 if (! string || ! *string) |
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141 return 0; |
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142 |
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143 if (*string == '/') |
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144 return 1; |
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145 |
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146 if (*string++ == '.') |
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147 { |
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148 if ((! *string) || *string == '/') |
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149 return 1; |
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150 |
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151 if (*string++ == '.') |
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152 if (! *string || *string == '/') |
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153 return 1; |
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154 } |
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155 return 0; |
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156 } |
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157 |
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158 /* |
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159 * Return 1 if STRING is an absolute program name; it is absolute if |
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160 * it contains any slashes. This is used to decide whether or not to |
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161 * look up through $PATH. |
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162 */ |
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163 int |
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164 absolute_program (const char *string) |
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165 { |
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166 return (strchr (string, '/') != 0); |
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167 } |
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168 |
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169 /* |
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170 * Return the `basename' of the pathname in STRING (the stuff after |
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171 * the last '/'). If STRING is not a full pathname, simply return it. |
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172 */ |
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173 char * |
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174 base_pathname (char *string) |
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175 { |
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176 char *p = strrchr (string, '/'); |
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177 |
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178 if (! absolute_pathname (string)) |
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179 return (string); |
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180 |
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181 if (p) |
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182 return (++p); |
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183 else |
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184 return (string); |
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185 } |
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186 |
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187 /* |
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188 * Turn STRING (a pathname) into an absolute pathname, assuming that |
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189 * DOT_PATH contains the symbolic location of '.'. This always |
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190 * returns a new string, even if STRING was an absolute pathname to |
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191 * begin with. |
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192 */ |
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193 char * |
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194 make_absolute (const char *string, const char *dot_path) |
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195 { |
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196 static char current_path[MAXPATHLEN]; |
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197 register char *cp; |
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198 |
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199 if (! dot_path || *string == '/') |
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200 return strsave (string); |
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201 |
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202 strcpy (current_path, dot_path); |
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203 |
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204 if (! current_path[0]) |
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205 strcpy (current_path, "./"); |
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206 |
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207 cp = current_path + (strlen (current_path) - 1); |
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208 |
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209 if (*cp++ != '/') |
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210 *cp++ = '/'; |
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211 |
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212 *cp = '\0'; |
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213 |
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214 while (*string) |
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215 { |
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216 if (*string == '.') |
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217 { |
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218 if (! string[1]) |
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219 return strsave (current_path); |
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220 |
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221 if (string[1] == '/') |
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222 { |
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223 string += 2; |
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224 continue; |
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225 } |
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226 |
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227 if (string[1] == '.' && (string[2] == '/' || ! string[2])) |
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228 { |
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229 string += 2; |
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230 |
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231 if (*string) |
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232 string++; |
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233 |
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234 pathname_backup (current_path, 1); |
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235 cp = current_path + strlen (current_path); |
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236 continue; |
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237 } |
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238 } |
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239 |
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240 while (*string && *string != '/') |
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241 *cp++ = *string++; |
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242 |
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243 if (*string) |
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244 *cp++ = *string++; |
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245 |
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246 *cp = '\0'; |
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247 } |
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248 return strsave (current_path); |
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249 } |
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250 |
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251 /* |
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252 * Has file `A' been modified after time `T'? |
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253 * |
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254 * case: |
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255 * |
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256 * a newer than t returns 1 |
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257 * a older than t returns 0 |
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258 * stat on a fails returns -1 |
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259 */ |
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260 int |
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261 is_newer (const char *fa, time_t t) |
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262 { |
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263 struct stat fa_sb; |
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264 register int fa_stat; |
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265 register int status = 0; |
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266 |
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267 fa_stat = stat (fa, &fa_sb); |
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268 if (fa_stat != 0) |
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269 status = -1; |
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270 |
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271 if (status != 0) |
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272 return status; |
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273 |
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274 return (fa_sb.st_mtime > t); |
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275 } |
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276 |
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277 /* |
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278 * Return a consed string which is the current working directory. |
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279 * FOR_WHOM is the name of the caller for error printing. |
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280 */ |
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281 char * |
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282 get_working_directory (const char *for_whom) |
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283 { |
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284 if (! follow_symbolic_links) |
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285 { |
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286 if (the_current_working_directory) |
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287 delete [] the_current_working_directory; |
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288 |
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289 the_current_working_directory = 0; |
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290 } |
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291 |
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292 if (! the_current_working_directory) |
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293 { |
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294 char *directory; |
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295 |
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296 the_current_working_directory = new char [MAXPATHLEN]; |
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297 directory = getcwd (the_current_working_directory, MAXPATHLEN); |
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298 if (! directory) |
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299 { |
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300 message (for_whom, the_current_working_directory); |
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301 delete [] the_current_working_directory; |
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302 the_current_working_directory = 0; |
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303 return 0; |
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304 } |
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305 } |
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306 |
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307 return the_current_working_directory; |
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308 } |
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309 |
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310 /* |
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311 * Do the work of changing to the directory NEWDIR. Handle symbolic |
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312 * link following, etc. |
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313 */ |
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314 static int |
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315 change_to_directory (const char *newdir) |
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316 { |
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317 char *t; |
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318 |
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319 if (follow_symbolic_links) |
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320 { |
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321 if (! the_current_working_directory) |
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322 get_working_directory ("cd_links"); |
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323 |
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324 if (the_current_working_directory) |
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325 t = make_absolute (newdir, the_current_working_directory); |
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326 else |
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327 t = strsave (newdir); |
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328 |
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329 /* Get rid of trailing `/'. */ |
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330 { |
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331 register int len_t = strlen (t); |
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332 if (len_t > 1) |
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333 { |
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334 --len_t; |
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335 if (t[len_t] == '/') |
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336 t[len_t] = '\0'; |
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337 } |
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338 } |
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339 |
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340 if (chdir (t) < 0) |
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341 { |
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342 delete [] t; |
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343 return 0; |
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344 } |
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345 |
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346 if (the_current_working_directory) |
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347 strcpy (the_current_working_directory, t); |
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348 |
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349 delete [] t; |
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350 return 1; |
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351 } |
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352 else |
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353 { |
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354 if (chdir (newdir) < 0) |
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355 return 0; |
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356 else |
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357 return 1; |
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358 } |
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359 } |
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360 |
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361 DEFUN_TEXT ("cd", Fcd, Scd, 2, 1, |
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362 "cd [dir]\n\ |
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363 \n\ |
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364 change current working directory\n\ |
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365 if no arguments are given, the current directory is changed to the\n\ |
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366 users home directory") |
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367 { |
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368 Octave_object retval; |
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369 |
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370 DEFINE_ARGV("cd"); |
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371 |
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372 if (argc > 1) |
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373 { |
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374 static char *dirname = 0; |
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375 |
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376 if (dirname) |
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377 free (dirname); |
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378 |
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379 dirname = tilde_expand (argv[1]); |
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380 |
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381 if (dirname && ! change_to_directory (dirname)) |
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382 { |
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383 error ("%s: %s", dirname, strerror (errno)); |
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384 DELETE_ARGV; |
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385 return retval; |
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386 } |
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387 } |
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388 else |
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389 { |
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390 if (!home_directory) |
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391 { |
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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 if (!change_to_directory (home_directory)) |
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397 { |
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398 error ("%s: %s", home_directory, strerror (errno)); |
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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 |
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404 |
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405 char *directory = get_working_directory ("cd"); |
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406 tree_constant *dir = new tree_constant (directory); |
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407 bind_builtin_variable ("PWD", dir, 1); |
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408 |
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409 DELETE_ARGV; |
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410 |
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411 return retval; |
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412 } |
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413 |
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414 /* |
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415 * Get a directory listing. |
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416 */ |
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417 DEFUN_TEXT ("ls", Fls, Sls, -1, 1, |
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418 "ls [options]\n\ |
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419 \n\ |
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420 print a directory listing") |
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421 { |
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422 Octave_object retval; |
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423 |
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424 DEFINE_ARGV("ls"); |
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425 |
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426 ostrstream ls_buf; |
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427 |
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428 ls_buf << "ls -C "; |
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429 for (int i = 1; i < argc; i++) |
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430 ls_buf << tilde_expand (argv[i]) << " "; |
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431 |
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432 ls_buf << ends; |
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433 |
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434 char *ls_command = ls_buf.str (); |
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435 |
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436 iprocstream cmd (ls_command); |
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437 |
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438 char ch; |
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439 ostrstream output_buf; |
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440 while (cmd.get (ch)) |
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441 output_buf.put (ch); |
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442 |
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443 output_buf << ends; |
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444 |
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445 maybe_page_output (output_buf); |
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446 |
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447 delete [] ls_command; |
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448 |
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449 DELETE_ARGV; |
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450 |
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451 return retval; |
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452 } |
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453 |
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549
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454 DEFALIAS (dir, ls); |
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455 |
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523
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456 DEFUN ("pwd", Fpwd, Spwd, 1, 0, |
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457 "pwd (): print current working directory") |
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458 { |
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459 Octave_object retval; |
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460 char *directory; |
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461 |
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462 if (verbatim_pwd) |
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463 { |
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464 char *buffer = new char [MAXPATHLEN]; |
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465 directory = getcwd (buffer, MAXPATHLEN); |
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466 |
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467 if (!directory) |
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468 { |
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469 warning ("pwd: can't find working directory!"); |
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470 delete buffer; |
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471 } |
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472 } |
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473 else |
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474 { |
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475 directory = get_working_directory ("pwd"); |
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476 } |
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477 |
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478 if (directory) |
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479 { |
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480 char *s = strconcat (directory, "\n"); |
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481 retval = s; |
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482 delete [] s; |
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483 } |
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484 return retval; |
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485 } |
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486 |
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487 /* |
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488 ;;; Local Variables: *** |
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489 ;;; mode: C++ *** |
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490 ;;; page-delimiter: "^/\\*" *** |
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491 ;;; End: *** |
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492 */ |
