Mercurial > hg > octave-lyh
annotate liboctave/file-stat.h @ 8689:ddbe87599331
base_file_stat::is_XXX: return false if object is not initialized
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Thu, 05 Feb 2009 17:38:24 -0500 |
| parents | 424ba638d8f1 |
| children | eb63fbe60fab |
| rev | line source |
|---|---|
| 2926 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2005, 2006, 2007 |
| 4 John W. Eaton | |
| 2926 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 2926 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 2926 | 21 |
| 22 */ | |
| 23 | |
| 24 #if !defined (octave_file_stat_h) | |
| 25 #define octave_file_stat_h 1 | |
| 26 | |
| 27 #include <string> | |
| 28 | |
| 3260 | 29 #include "oct-time.h" |
| 30 | |
| 2926 | 31 #ifdef HAVE_SYS_TYPES_H |
| 32 #include <sys/types.h> | |
| 33 #endif | |
| 34 | |
| 35 class | |
| 6108 | 36 OCTAVE_API |
| 8549 | 37 base_file_stat |
| 2926 | 38 { |
| 39 public: | |
| 40 | |
| 8549 | 41 base_file_stat (void) |
| 42 : initialized (false), fail (false), errmsg (), fs_mode (), | |
| 43 fs_ino (), fs_dev (), fs_nlink (), fs_uid (), fs_gid (), | |
| 44 fs_size (), fs_atime (), fs_mtime (), fs_ctime (), fs_rdev (), | |
| 45 fs_blksize (), fs_blocks () { } | |
| 46 | |
| 47 base_file_stat (const base_file_stat& fs) | |
| 48 : initialized (fs.initialized), fail (fs.fail), errmsg (fs.errmsg), | |
| 49 fs_mode (fs.fs_mode), fs_ino (fs.fs_ino), fs_dev (fs.fs_dev), | |
| 50 fs_nlink (fs.fs_nlink), fs_uid (fs.fs_uid), fs_gid (fs.fs_gid), | |
| 51 fs_size (fs.fs_size), fs_atime (fs.fs_atime), fs_mtime (fs.fs_mtime), | |
| 52 fs_ctime (fs.fs_ctime), fs_rdev (fs.fs_rdev), | |
| 53 fs_blksize (fs.fs_blksize), fs_blocks (fs.fs_blocks) { } | |
| 54 | |
| 55 base_file_stat& operator = (const base_file_stat& fs) | |
| 56 { | |
| 57 if (this != &fs) | |
| 2926 | 58 { |
| 8549 | 59 initialized = fs.initialized; |
| 60 fail = fs.fail; | |
| 61 errmsg = fs.errmsg; | |
| 62 fs_mode = fs.fs_mode; | |
| 63 fs_ino = fs.fs_ino; | |
| 64 fs_dev = fs.fs_dev; | |
| 65 fs_nlink = fs.fs_nlink; | |
| 66 fs_uid = fs.fs_uid; | |
| 67 fs_gid = fs.fs_gid; | |
| 68 fs_size = fs.fs_size; | |
| 69 fs_atime = fs.fs_atime; | |
| 70 fs_mtime = fs.fs_mtime; | |
| 71 fs_ctime = fs.fs_ctime; | |
| 72 fs_rdev = fs.fs_rdev; | |
| 73 fs_blksize = fs.fs_blksize; | |
| 74 fs_blocks = fs.fs_blocks; | |
| 2926 | 75 } |
| 76 | |
| 8549 | 77 return *this; |
| 78 } | |
| 2926 | 79 |
| 8549 | 80 ~base_file_stat (void) { } |
| 2926 | 81 |
|
8689
ddbe87599331
base_file_stat::is_XXX: return false if object is not initialized
John W. Eaton <jwe@octave.org>
parents:
8549
diff
changeset
|
82 // File status and info. The is_XXX functions will return false for |
|
ddbe87599331
base_file_stat::is_XXX: return false if object is not initialized
John W. Eaton <jwe@octave.org>
parents:
8549
diff
changeset
|
83 // file_stat objects that are not properly initialized. The others |
|
ddbe87599331
base_file_stat::is_XXX: return false if object is not initialized
John W. Eaton <jwe@octave.org>
parents:
8549
diff
changeset
|
84 // should all return 0 (or the equivalent, for the given object) |
|
ddbe87599331
base_file_stat::is_XXX: return false if object is not initialized
John W. Eaton <jwe@octave.org>
parents:
8549
diff
changeset
|
85 // which is likely not meaningful. |
| 2926 | 86 |
| 87 bool is_blk (void) const; | |
| 88 bool is_chr (void) const; | |
| 89 bool is_dir (void) const; | |
| 90 bool is_fifo (void) const; | |
| 91 bool is_lnk (void) const; | |
| 92 bool is_reg (void) const; | |
| 93 bool is_sock (void) const; | |
| 94 | |
| 5476 | 95 static bool is_blk (mode_t mode); |
| 96 static bool is_chr (mode_t mode); | |
| 97 static bool is_dir (mode_t mode); | |
| 98 static bool is_fifo (mode_t mode); | |
| 99 static bool is_lnk (mode_t mode); | |
| 100 static bool is_reg (mode_t mode); | |
| 101 static bool is_sock (mode_t mode); | |
| 102 | |
| 2926 | 103 ino_t ino (void) const { return fs_ino; } |
| 104 dev_t dev (void) const { return fs_dev; } | |
| 105 | |
| 106 nlink_t nlink (void) const { return fs_nlink; } | |
| 107 | |
| 108 uid_t uid (void) const { return fs_uid; } | |
| 109 gid_t gid (void) const { return fs_gid; } | |
| 110 | |
| 111 off_t size (void) const { return fs_size; } | |
| 112 | |
| 3260 | 113 octave_time atime (void) const { return fs_atime; } |
| 114 octave_time mtime (void) const { return fs_mtime; } | |
| 115 octave_time ctime (void) const { return fs_ctime; } | |
| 2926 | 116 |
| 117 dev_t rdev (void) const { return fs_rdev; } | |
| 118 | |
| 119 long blksize (void) const { return fs_blksize; } | |
| 120 long blocks (void) const { return fs_blocks; } | |
| 121 | |
| 5476 | 122 mode_t mode (void) const { return fs_mode; } |
| 123 | |
| 3504 | 124 std::string mode_as_string (void) const; |
| 2926 | 125 |
| 126 bool ok (void) const { return initialized && ! fail; } | |
| 127 | |
| 3145 | 128 operator bool () const { return ok (); } |
| 2926 | 129 |
| 130 bool exists (void) const { return ok (); } | |
| 131 | |
| 3504 | 132 std::string error (void) const { return ok () ? std::string () : errmsg; } |
| 2926 | 133 |
| 134 // Has the file referenced by this object been modified since TIME? | |
| 3260 | 135 bool is_newer (const octave_time& time) const { return fs_mtime > time; } |
| 2926 | 136 |
| 137 // It's nice to be able to hide the file_stat object if we don't | |
| 138 // really care about it. | |
| 3504 | 139 static int is_newer (const std::string&, const octave_time&); |
| 2926 | 140 |
| 8549 | 141 protected: |
| 2926 | 142 |
| 143 // TRUE means we have already called stat. | |
| 144 bool initialized; | |
| 145 | |
| 146 // TRUE means the stat for this file failed. | |
| 147 bool fail; | |
| 148 | |
| 149 // If a failure occurs, this contains the system error text. | |
| 3504 | 150 std::string errmsg; |
| 2926 | 151 |
| 152 // file type and permissions | |
| 153 mode_t fs_mode; | |
| 154 | |
| 155 // serial number | |
| 156 ino_t fs_ino; | |
| 157 | |
| 158 // device number | |
| 159 dev_t fs_dev; | |
| 160 | |
| 161 // number of links | |
| 162 nlink_t fs_nlink; | |
| 163 | |
| 164 // user ID of owner | |
| 165 uid_t fs_uid; | |
| 166 | |
| 167 // group ID of owner | |
| 168 gid_t fs_gid; | |
| 169 | |
| 170 // size in bytes, for regular files | |
| 171 off_t fs_size; | |
| 172 | |
| 173 // time of last access | |
| 3260 | 174 octave_time fs_atime; |
| 2926 | 175 |
| 176 // time of last modification | |
| 3260 | 177 octave_time fs_mtime; |
| 2926 | 178 |
| 179 // time of last file status change | |
| 3260 | 180 octave_time fs_ctime; |
| 2926 | 181 |
| 182 // device number for special files | |
| 183 dev_t fs_rdev; | |
| 184 | |
| 185 // best I/O block size | |
| 186 long fs_blksize; | |
| 187 | |
| 188 // number of 512-byte blocks allocated | |
| 189 long fs_blocks; | |
| 8549 | 190 }; |
| 191 | |
| 192 class | |
| 193 OCTAVE_API | |
| 194 file_stat : public base_file_stat | |
| 195 { | |
| 196 public: | |
| 197 | |
| 198 file_stat (const std::string& n = std::string (), bool fl = true) | |
| 199 : base_file_stat (), file_name (n), follow_links (fl) | |
| 200 { | |
| 201 if (! file_name.empty ()) | |
| 202 update_internal (); | |
| 203 } | |
| 204 | |
| 205 file_stat (const file_stat& fs) | |
| 206 : base_file_stat (fs), file_name (fs.file_name), | |
| 207 follow_links (fs.follow_links) { } | |
| 208 | |
| 209 file_stat& operator = (const file_stat& fs) | |
| 210 { | |
| 211 if (this != &fs) | |
| 212 { | |
| 213 base_file_stat::operator = (fs); | |
| 214 | |
| 215 file_name = fs.file_name; | |
| 216 follow_links = fs.follow_links; | |
| 217 } | |
| 218 | |
| 219 return *this; | |
| 220 } | |
| 221 | |
| 222 ~file_stat (void) { } | |
| 223 | |
| 224 void get_stats (bool force = false) | |
| 225 { | |
| 226 if (! initialized || force) | |
| 227 update_internal (force); | |
| 228 } | |
| 229 | |
| 230 void get_stats (const std::string& n, bool force = false) | |
| 231 { | |
| 232 if (n != file_name || ! initialized || force) | |
| 233 { | |
| 234 initialized = false; | |
| 235 | |
| 236 file_name = n; | |
| 237 | |
| 238 update_internal (force); | |
| 239 } | |
| 240 } | |
| 241 | |
| 242 private: | |
| 243 | |
| 244 // Name of the file. | |
| 245 std::string file_name; | |
| 246 | |
| 247 // TRUE means follow symbolic links to the ultimate file (stat). | |
| 248 // FALSE means get information about the link itself (lstat). | |
| 249 bool follow_links; | |
| 2926 | 250 |
| 251 void update_internal (bool force = false); | |
| 8549 | 252 }; |
| 2926 | 253 |
| 8549 | 254 class |
| 255 OCTAVE_API | |
| 256 file_fstat : public base_file_stat | |
| 257 { | |
| 258 public: | |
| 259 | |
| 260 file_fstat (int n) : base_file_stat (), fid (n) | |
| 261 { | |
| 262 update_internal (); | |
| 263 } | |
| 264 | |
| 265 file_fstat (const file_fstat& fs) | |
| 266 : base_file_stat (fs), fid (fs.fid) { } | |
| 267 | |
| 268 file_fstat& operator = (const file_fstat& fs) | |
| 269 { | |
| 270 if (this != &fs) | |
| 271 { | |
| 272 base_file_stat::operator = (fs); | |
| 273 | |
| 274 fid = fs.fid; | |
| 275 } | |
| 276 | |
| 277 return *this; | |
| 278 } | |
| 279 | |
| 280 ~file_fstat (void) { } | |
| 281 | |
| 282 void get_stats (bool force = false) | |
| 283 { | |
| 284 if (! initialized || force) | |
| 285 update_internal (force); | |
| 286 } | |
| 287 | |
| 288 void get_stats (int n, bool force = false) | |
| 289 { | |
| 290 if (n != fid || ! initialized || force) | |
| 291 { | |
| 292 initialized = false; | |
| 293 | |
| 294 fid = n; | |
| 295 | |
| 296 update_internal (force); | |
| 297 } | |
| 298 } | |
| 299 | |
| 300 private: | |
| 301 | |
| 302 // Open file descriptor. | |
| 303 int fid; | |
| 304 | |
| 305 void update_internal (bool force = false); | |
| 2926 | 306 }; |
| 307 | |
| 308 #endif | |
| 309 | |
| 310 /* | |
| 311 ;;; Local Variables: *** | |
| 312 ;;; mode: C++ *** | |
| 313 ;;; End: *** | |
| 314 */ |