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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_file_stat_h) |
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24 #define octave_file_stat_h 1 |
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25 |
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26 #include <string> |
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27 |
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28 #include "oct-time.h" |
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29 |
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30 #ifdef HAVE_SYS_TYPES_H |
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31 #include <sys/types.h> |
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32 #endif |
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33 |
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34 class |
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35 file_stat |
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36 { |
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37 public: |
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38 |
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39 file_stat (const string& n = string (), bool fl = true) |
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40 : file_name (n), follow_links (fl), initialized (false) |
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41 { |
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42 if (! file_name.empty ()) |
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43 update_internal (); |
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44 } |
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45 |
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46 file_stat (const file_stat& f) { copy (f); } |
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47 |
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48 file_stat& operator = (const file_stat& f) |
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49 { |
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50 if (this != &f) |
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51 copy (f); |
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52 |
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53 return *this; |
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54 } |
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55 |
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56 ~file_stat (void) { } |
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57 |
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58 void get_stats (bool force = false) |
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59 { |
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60 if (! initialized || force) |
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61 update_internal (force); |
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62 } |
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63 |
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64 void get_stats (const string& n, bool force = false) |
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65 { |
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66 if (n != file_name || ! initialized || force) |
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67 { |
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68 initialized = false; |
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69 |
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70 file_name = n; |
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71 |
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72 update_internal (force); |
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73 } |
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74 } |
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75 |
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76 // File status and info. These should only be called for objects |
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77 // that are already properly initialized. |
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78 |
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79 bool is_blk (void) const; |
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80 bool is_chr (void) const; |
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81 bool is_dir (void) const; |
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82 bool is_fifo (void) const; |
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83 bool is_lnk (void) const; |
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84 bool is_reg (void) const; |
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85 bool is_sock (void) const; |
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86 |
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87 ino_t ino (void) const { return fs_ino; } |
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88 dev_t dev (void) const { return fs_dev; } |
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89 |
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90 nlink_t nlink (void) const { return fs_nlink; } |
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91 |
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92 uid_t uid (void) const { return fs_uid; } |
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93 gid_t gid (void) const { return fs_gid; } |
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94 |
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95 off_t size (void) const { return fs_size; } |
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96 |
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97 octave_time atime (void) const { return fs_atime; } |
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98 octave_time mtime (void) const { return fs_mtime; } |
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99 octave_time ctime (void) const { return fs_ctime; } |
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100 |
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101 #if defined (HAVE_ST_RDEV) |
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102 dev_t rdev (void) const { return fs_rdev; } |
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103 #endif |
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104 |
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105 #if defined (HAVE_ST_BLKSIZE) |
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106 long blksize (void) const { return fs_blksize; } |
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107 #endif |
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108 |
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109 #if defined (HAVE_ST_BLOCKS) |
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110 long blocks (void) const { return fs_blocks; } |
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111 #endif |
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112 |
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113 string mode_as_string (void) const; |
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114 |
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115 bool ok (void) const { return initialized && ! fail; } |
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116 |
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117 operator bool () const { return ok (); } |
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118 |
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119 bool exists (void) const { return ok (); } |
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120 |
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121 string error (void) const { return ok () ? string () : errmsg; } |
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122 |
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123 // Has the file referenced by this object been modified since TIME? |
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124 bool is_newer (const octave_time& time) const { return fs_mtime > time; } |
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125 |
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126 // It's nice to be able to hide the file_stat object if we don't |
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127 // really care about it. |
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128 static int is_newer (const string&, const octave_time&); |
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129 |
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130 private: |
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131 |
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132 // Name of the file. |
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133 string file_name; |
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134 |
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135 // TRUE means follow symbolic links to the ultimate file (stat). |
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136 // FALSE means get information about the link itself (lstat). |
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137 bool follow_links; |
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138 |
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139 // TRUE means we have already called stat. |
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140 bool initialized; |
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141 |
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142 // TRUE means the stat for this file failed. |
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143 bool fail; |
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144 |
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145 // If a failure occurs, this contains the system error text. |
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146 string errmsg; |
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147 |
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148 // file type and permissions |
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149 mode_t fs_mode; |
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150 |
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151 // serial number |
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152 ino_t fs_ino; |
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153 |
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154 // device number |
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155 dev_t fs_dev; |
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156 |
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157 // number of links |
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158 nlink_t fs_nlink; |
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159 |
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160 // user ID of owner |
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161 uid_t fs_uid; |
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162 |
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163 // group ID of owner |
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164 gid_t fs_gid; |
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165 |
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166 // size in bytes, for regular files |
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167 off_t fs_size; |
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168 |
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169 // time of last access |
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170 octave_time fs_atime; |
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171 |
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172 // time of last modification |
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173 octave_time fs_mtime; |
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174 |
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175 // time of last file status change |
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176 octave_time fs_ctime; |
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177 |
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178 #if defined (HAVE_ST_RDEV) |
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179 // device number for special files |
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180 dev_t fs_rdev; |
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181 #endif |
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182 |
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183 #if defined (HAVE_ST_BLKSIZE) |
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184 // best I/O block size |
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185 long fs_blksize; |
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186 #endif |
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187 |
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188 #if defined (HAVE_ST_BLOCKS) |
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189 // number of 512-byte blocks allocated |
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190 long fs_blocks; |
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191 #endif |
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192 |
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193 void update_internal (bool force = false); |
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194 |
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195 void copy (const file_stat&); |
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196 }; |
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197 |
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198 #endif |
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199 |
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200 /* |
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201 ;;; Local Variables: *** |
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202 ;;; mode: C++ *** |
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203 ;;; End: *** |
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204 */ |
