Mercurial > hg > octave-nkf
annotate liboctave/oct-env.cc @ 8870:eea0e1b45ec0
optimize string manipulation in lookfor
| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Wed, 25 Feb 2009 10:21:33 +0100 |
| parents | 85184151822e |
| children | eb63fbe60fab |
| rev | line source |
|---|---|
| 2926 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2006, |
| 4 2007 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 /* | |
| 25 | |
| 26 The functions listed below were adapted from a similar functions | |
| 27 from GNU Bash, the Bourne Again SHell, copyright (C) 1987, 1989, 1991 | |
| 28 Free Software Foundation, Inc. | |
| 29 | |
| 30 octave_env::do_absolute_pathname | |
| 31 octave_env::do_base_pathname | |
| 32 octave_env::do_chdir | |
| 33 octave_env::do_getcwd | |
| 34 octave_env::do_make_absolute | |
| 35 octave_env::do_polite_directory_format | |
| 36 octave_env::pathname_backup | |
| 37 | |
| 38 */ | |
| 39 | |
| 40 #ifdef HAVE_CONFIG_H | |
| 41 #include <config.h> | |
| 42 #endif | |
| 43 | |
| 4093 | 44 #include <cctype> |
| 2926 | 45 #include <cstdlib> |
| 7048 | 46 #include <cstring> |
| 4093 | 47 |
| 3504 | 48 #include <string> |
| 2926 | 49 |
| 50 #ifdef HAVE_UNISTD_H | |
| 51 #ifdef HAVE_SYS_TYPES_H | |
| 52 #include <sys/types.h> | |
| 53 #endif | |
| 54 #include <unistd.h> | |
| 55 #endif | |
| 56 | |
| 4097 | 57 #include "file-ops.h" |
| 2926 | 58 #include "lo-error.h" |
| 59 #include "lo-sysdep.h" | |
| 60 #include "lo-utils.h" | |
| 61 #include "oct-env.h" | |
| 2934 | 62 #include "oct-passwd.h" |
| 2947 | 63 #include "oct-syscalls.h" |
| 2926 | 64 |
| 65 octave_env::octave_env (void) | |
| 66 : follow_symbolic_links (true), verbatim_pwd (true), | |
| 67 current_directory (), program_name (), program_invocation_name (), | |
| 68 user_name (), host_name () | |
| 69 { | |
| 70 // Get a real value for the current directory. | |
| 71 do_getcwd (); | |
| 72 | |
| 73 // Etc. | |
| 74 do_get_user_name (); | |
| 75 | |
| 76 do_get_host_name (); | |
| 77 } | |
| 78 | |
| 79 octave_env *octave_env::instance = 0; | |
| 80 | |
| 81 bool | |
| 82 octave_env::instance_ok (void) | |
| 83 { | |
| 84 bool retval = true; | |
| 85 | |
| 86 if (! instance) | |
| 87 instance = new octave_env (); | |
| 88 | |
| 89 if (! instance) | |
| 90 { | |
| 91 (*current_liboctave_error_handler) | |
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92 ("unable to create current working directory object!"); |
| 2926 | 93 |
| 94 retval = false; | |
| 95 } | |
| 96 | |
| 97 return retval; | |
| 98 } | |
| 99 | |
| 3504 | 100 std::string |
| 101 octave_env::polite_directory_format (const std::string& name) | |
| 2926 | 102 { |
| 103 return (instance_ok ()) | |
| 3504 | 104 ? instance->do_polite_directory_format (name) : std::string (); |
| 2926 | 105 } |
| 106 | |
| 107 bool | |
| 3504 | 108 octave_env::absolute_pathname (const std::string& s) |
| 2926 | 109 { |
| 110 return (instance_ok ()) | |
| 111 ? instance->do_absolute_pathname (s) : false; | |
| 112 } | |
| 113 | |
| 6838 | 114 bool |
| 115 octave_env::rooted_relative_pathname (const std::string& s) | |
| 116 { | |
| 117 return (instance_ok ()) | |
| 118 ? instance->do_rooted_relative_pathname (s) : false; | |
| 119 } | |
| 120 | |
| 3504 | 121 std::string |
| 122 octave_env::base_pathname (const std::string& s) | |
| 2926 | 123 { |
| 124 return (instance_ok ()) | |
| 3504 | 125 ? instance->do_base_pathname (s) : std::string (); |
| 2926 | 126 } |
| 127 | |
| 3504 | 128 std::string |
| 129 octave_env::make_absolute (const std::string& s, const std::string& dot_path) | |
| 2926 | 130 { |
| 131 return (instance_ok ()) | |
| 3504 | 132 ? instance->do_make_absolute (s, dot_path) : std::string (); |
| 2926 | 133 } |
| 134 | |
| 3504 | 135 std::string |
| 2926 | 136 octave_env::getcwd () |
| 137 { | |
| 138 return (instance_ok ()) | |
| 3504 | 139 ? instance->do_getcwd () : std::string (); |
| 2926 | 140 } |
| 141 | |
| 3504 | 142 std::string |
| 2926 | 143 octave_env::get_home_directory () |
| 144 { | |
| 145 return (instance_ok ()) | |
| 3504 | 146 ? instance->do_get_home_directory () : std::string (); |
| 2926 | 147 } |
| 148 | |
| 3504 | 149 std::string |
| 2926 | 150 octave_env::get_program_name (void) |
| 151 { | |
| 152 return (instance_ok ()) | |
| 3504 | 153 ? instance->program_name : std::string (); |
| 2926 | 154 } |
| 155 | |
| 3504 | 156 std::string |
| 2926 | 157 octave_env::get_program_invocation_name (void) |
| 158 { | |
| 159 return (instance_ok ()) | |
| 3504 | 160 ? instance->program_invocation_name : std::string (); |
| 2926 | 161 } |
| 162 | |
| 163 void | |
| 3504 | 164 octave_env::set_program_name (const std::string& s) |
| 2926 | 165 { |
| 166 if (instance_ok ()) | |
| 167 instance->do_set_program_name (s); | |
| 168 } | |
| 169 | |
| 3504 | 170 std::string |
| 2926 | 171 octave_env::get_user_name (void) |
| 172 { | |
| 173 return (instance_ok ()) | |
| 3504 | 174 ? instance->do_get_user_name () : std::string (); |
| 2926 | 175 } |
| 176 | |
| 3504 | 177 std::string |
| 2926 | 178 octave_env::get_host_name (void) |
| 179 { | |
| 180 return (instance_ok ()) | |
| 3504 | 181 ? instance->do_get_host_name () : std::string (); |
| 2926 | 182 } |
| 183 | |
| 5775 | 184 // FIXME -- this leaves no way to distinguish between a |
| 2926 | 185 // variable that is not set and one that is set to the empty string. |
| 186 // Is this a problem? | |
| 187 | |
| 3504 | 188 std::string |
| 189 octave_env::getenv (const std::string& name) | |
| 2926 | 190 { |
| 191 return (instance_ok ()) | |
| 3504 | 192 ? instance->do_getenv (name) : std::string (); |
| 2926 | 193 } |
| 194 | |
| 195 void | |
| 3504 | 196 octave_env::putenv (const std::string& name, const std::string& value) |
| 2926 | 197 { |
| 198 octave_putenv (name, value); | |
| 199 } | |
| 200 | |
| 201 bool | |
| 5489 | 202 octave_env::have_x11_display (void) |
| 203 { | |
| 204 std::string display = getenv ("DISPLAY"); | |
| 205 | |
| 206 return ! display.empty (); | |
| 207 } | |
| 208 | |
| 209 bool | |
| 3504 | 210 octave_env::chdir (const std::string& newdir) |
| 2926 | 211 { |
| 212 return (instance_ok ()) | |
| 213 ? instance->do_chdir (newdir) : false; | |
| 214 } | |
| 215 | |
| 216 void | |
| 3504 | 217 octave_env::do_set_program_name (const std::string& s) const |
| 2926 | 218 { |
| 219 program_invocation_name = s; | |
| 220 | |
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221 size_t pos |
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222 = program_invocation_name.find_last_of (file_ops::dir_sep_chars ()); |
| 2926 | 223 |
| 8021 | 224 program_name = (pos == std::string::npos) |
| 2926 | 225 ? program_invocation_name : program_invocation_name.substr (pos+1); |
| 226 } | |
| 227 | |
| 228 // Return a pretty pathname. If the first part of the pathname is the | |
| 229 // same as $HOME, then replace that with `~'. | |
| 230 | |
| 3504 | 231 std::string |
| 232 octave_env::do_polite_directory_format (const std::string& name) const | |
| 2926 | 233 { |
| 3504 | 234 std::string retval; |
| 2926 | 235 |
| 3504 | 236 std::string home_dir = do_get_home_directory (); |
| 2926 | 237 |
| 238 size_t len = home_dir.length (); | |
| 239 | |
| 3516 | 240 if (len > 1 && home_dir == name.substr (0, len) |
| 4097 | 241 && (name.length () == len || file_ops::is_dir_sep (name[len]))) |
| 2926 | 242 { |
| 243 retval = "~"; | |
| 244 retval.append (name.substr (len)); | |
| 245 } | |
| 246 else | |
| 247 retval = name; | |
| 248 | |
| 249 return retval; | |
| 250 } | |
| 251 | |
| 252 bool | |
| 3504 | 253 octave_env::do_absolute_pathname (const std::string& s) const |
| 2926 | 254 { |
| 4087 | 255 size_t len = s.length (); |
| 256 | |
| 257 if (len == 0) | |
| 258 return false; | |
| 2926 | 259 |
| 4097 | 260 if (file_ops::is_dir_sep (s[0])) |
| 2926 | 261 return true; |
| 262 | |
| 4101 | 263 #if defined (OCTAVE_HAVE_WINDOWS_FILESYSTEM) |
| 4088 | 264 if ((len == 2 && isalpha (s[0]) && s[1] == ':') |
| 4097 | 265 || (len > 2 && isalpha (s[0]) && s[1] == ':' |
| 266 && file_ops::is_dir_sep (s[2]))) | |
| 4087 | 267 return true; |
| 268 #endif | |
| 269 | |
| 2926 | 270 return false; |
| 271 } | |
| 272 | |
| 6838 | 273 bool |
| 274 octave_env::do_rooted_relative_pathname (const std::string& s) const | |
| 275 { | |
| 276 size_t len = s.length (); | |
| 277 | |
| 278 if (len == 0) | |
| 279 return false; | |
| 280 | |
| 281 if (len == 1 && s[0] == '.') | |
| 282 return true; | |
| 283 | |
| 284 if (len > 1 && s[0] == '.' && file_ops::is_dir_sep (s[1])) | |
| 285 return true; | |
| 286 | |
| 287 if (len == 2 && s[0] == '.' && s[1] == '.') | |
| 288 return true; | |
| 289 | |
| 290 if (len > 2 && s[0] == '.' && s[1] == '.' && file_ops::is_dir_sep (s[2])) | |
| 291 return true; | |
| 292 | |
| 293 return false; | |
| 294 } | |
| 295 | |
| 2926 | 296 // Return the `basename' of the pathname in STRING (the stuff after |
| 4097 | 297 // the last directory separator). If STRING is not a full pathname, |
| 298 // simply return it. | |
| 2926 | 299 |
| 3504 | 300 std::string |
| 301 octave_env::do_base_pathname (const std::string& s) const | |
| 2926 | 302 { |
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303 if (! (do_absolute_pathname (s) || do_rooted_relative_pathname (s))) |
| 2926 | 304 return s; |
| 305 | |
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306 size_t pos = s.find_last_of (file_ops::dir_sep_chars ()); |
| 2926 | 307 |
| 8021 | 308 if (pos == std::string::npos) |
| 2926 | 309 return s; |
| 310 else | |
| 311 return s.substr (pos+1); | |
| 312 } | |
| 313 | |
| 314 // Turn STRING (a pathname) into an absolute pathname, assuming that | |
| 4097 | 315 // DOT_PATH contains the symbolic location of the current directory. |
| 2926 | 316 |
| 3504 | 317 std::string |
| 318 octave_env::do_make_absolute (const std::string& s, | |
| 319 const std::string& dot_path) const | |
| 2926 | 320 { |
| 321 #if defined (__EMX__) | |
| 322 if (s.length () > 1 && s[1] == ':') | |
| 323 return s; | |
| 324 #endif | |
| 325 | |
| 4087 | 326 if (dot_path.empty () || s.empty () || do_absolute_pathname (s)) |
| 2926 | 327 return s; |
| 328 | |
| 4097 | 329 std::string current_dir = dot_path; |
| 2926 | 330 |
| 4097 | 331 if (current_dir.empty ()) |
| 332 current_dir = do_getcwd (); | |
| 2926 | 333 |
| 4097 | 334 size_t pos = current_dir.length () - 1; |
| 2926 | 335 |
| 4097 | 336 if (! file_ops::is_dir_sep (current_dir[pos])) |
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337 current_dir.append (file_ops::dir_sep_str ()); |
| 4097 | 338 |
| 5775 | 339 // FIXME -- this is probably not correct for all systems. |
| 2926 | 340 |
| 341 size_t i = 0; | |
| 342 size_t slen = s.length (); | |
| 343 | |
| 344 while (i < slen) | |
| 345 { | |
| 346 if (s[i] == '.') | |
| 347 { | |
| 348 if (i + 1 == slen) | |
| 4097 | 349 return current_dir; |
| 2926 | 350 |
| 4097 | 351 if (file_ops::is_dir_sep (s[i+1])) |
| 2926 | 352 { |
| 353 i += 2; | |
| 354 continue; | |
| 355 } | |
| 356 | |
| 4097 | 357 if (s[i+1] == '.' |
| 358 && (i + 2 == slen || file_ops::is_dir_sep (s[i+2]))) | |
| 2926 | 359 { |
| 360 i += 2; | |
| 361 | |
| 362 if (i != slen) | |
| 363 i++; | |
| 364 | |
| 4097 | 365 pathname_backup (current_dir, 1); |
| 2926 | 366 |
| 367 continue; | |
| 368 } | |
| 369 } | |
| 370 | |
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371 size_t tmp = s.find_first_of (file_ops::dir_sep_chars (), i); |
| 2926 | 372 |
| 8021 | 373 if (tmp == std::string::npos) |
| 2926 | 374 { |
| 4097 | 375 current_dir.append (s, i, tmp-i); |
| 2926 | 376 break; |
| 377 } | |
| 378 else | |
| 379 { | |
| 4097 | 380 current_dir.append (s, i, tmp-i+1); |
| 2926 | 381 i = tmp + 1; |
| 382 } | |
| 383 } | |
| 384 | |
| 4097 | 385 return current_dir; |
| 2926 | 386 } |
| 387 | |
| 4097 | 388 // Return a string which is the current working directory. |
| 2926 | 389 |
| 3504 | 390 std::string |
| 4097 | 391 octave_env::do_getcwd () const |
| 2926 | 392 { |
| 393 if (! follow_symbolic_links) | |
| 394 current_directory = ""; | |
| 395 | |
| 396 if (verbatim_pwd || current_directory.empty ()) | |
| 397 current_directory = ::octave_getcwd (); | |
| 398 | |
| 399 return current_directory; | |
| 400 } | |
| 401 | |
| 402 // This value is not cached because it can change while Octave is | |
| 403 // running. | |
| 404 | |
| 3504 | 405 std::string |
| 2926 | 406 octave_env::do_get_home_directory (void) const |
| 407 { | |
| 3504 | 408 std::string hd = do_getenv ("HOME"); |
| 2926 | 409 |
| 6096 | 410 #if defined (__MINGW32__) || defined (_MSC_VER) |
| 411 // Maybe we are started directly from cmd.exe. | |
| 5451 | 412 if (hd.empty ()) |
| 5454 | 413 { |
| 414 std::string drv = do_getenv ("HOMEDRIVE"); | |
| 415 if (drv.empty ()) | |
| 416 hd = do_getenv ("HOMEPATH"); | |
| 417 else | |
| 418 hd = drv + do_getenv ("HOMEPATH"); | |
| 419 } | |
| 5451 | 420 #endif |
| 421 | |
| 2947 | 422 if (hd.empty ()) |
| 423 { | |
| 424 octave_passwd pw = octave_passwd::getpwuid (octave_syscalls::getuid ()); | |
| 425 | |
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426 hd = pw ? pw.dir () : std::string (file_ops::dir_sep_str ()); |
| 2947 | 427 } |
| 428 | |
| 429 return hd; | |
| 2926 | 430 } |
| 431 | |
| 3504 | 432 std::string |
| 2926 | 433 octave_env::do_get_user_name (void) const |
| 434 { | |
| 435 if (user_name.empty ()) | |
| 436 { | |
| 2947 | 437 octave_passwd pw = octave_passwd::getpwuid (octave_syscalls::getuid ()); |
| 2926 | 438 |
| 3504 | 439 user_name = pw ? pw.name () : std::string ("unknown"); |
| 2926 | 440 } |
| 441 | |
| 442 return user_name; | |
| 443 } | |
| 444 | |
| 3504 | 445 std::string |
| 2926 | 446 octave_env::do_get_host_name (void) const |
| 447 { | |
| 448 if (host_name.empty ()) | |
| 449 { | |
| 450 char hostname[256]; | |
| 451 | |
| 3803 | 452 int status = octave_gethostname (hostname, 255); |
| 2926 | 453 |
| 3185 | 454 host_name = (status < 0) ? "unknown" : hostname; |
| 2926 | 455 } |
| 456 | |
| 457 return host_name; | |
| 458 } | |
| 459 | |
| 3504 | 460 std::string |
| 461 octave_env::do_getenv (const std::string& name) const | |
| 2926 | 462 { |
| 463 char *value = ::getenv (name.c_str ()); | |
| 464 | |
| 465 return value ? value : ""; | |
| 466 } | |
| 467 | |
| 468 // Do the work of changing to the directory NEWDIR. Handle symbolic | |
| 469 // link following, etc. | |
| 470 | |
| 471 bool | |
| 3504 | 472 octave_env::do_chdir (const std::string& newdir) |
| 2926 | 473 { |
| 474 bool retval = false; | |
| 475 | |
| 3504 | 476 std::string tmp; |
| 2926 | 477 |
| 478 if (follow_symbolic_links) | |
| 479 { | |
| 480 if (current_directory.empty ()) | |
| 481 do_getcwd (); | |
| 482 | |
| 483 if (current_directory.empty ()) | |
| 484 tmp = newdir; | |
| 485 else | |
| 486 tmp = do_make_absolute (newdir, current_directory); | |
| 487 | |
| 4097 | 488 // Get rid of trailing directory separator. |
| 2926 | 489 |
| 490 size_t len = tmp.length (); | |
| 491 | |
| 492 if (len > 1) | |
| 493 { | |
| 4097 | 494 if (file_ops::is_dir_sep (tmp[--len])) |
| 2926 | 495 tmp.resize (len); |
| 496 } | |
| 497 | |
| 498 if (! ::octave_chdir (tmp)) | |
| 499 { | |
| 500 current_directory = tmp; | |
| 501 retval = true; | |
| 502 } | |
| 503 } | |
| 504 else | |
| 505 retval = (! ::octave_chdir (newdir)); | |
| 506 | |
| 507 return retval; | |
| 508 } | |
| 509 | |
| 510 // Remove the last N directories from PATH. | |
| 511 | |
| 512 void | |
| 3504 | 513 octave_env::pathname_backup (std::string& path, int n) const |
| 2926 | 514 { |
| 515 if (path.empty ()) | |
| 516 return; | |
| 517 | |
| 518 size_t i = path.length () - 1; | |
| 519 | |
| 520 while (n--) | |
| 521 { | |
| 4097 | 522 while (file_ops::is_dir_sep (path[i]) && i > 0) |
| 2926 | 523 i--; |
| 524 | |
| 4097 | 525 while (! file_ops::is_dir_sep (path[i]) && i > 0) |
| 2926 | 526 i--; |
| 527 | |
| 528 i++; | |
| 529 } | |
| 530 | |
| 531 path.resize (i); | |
| 532 } | |
| 533 | |
| 534 void | |
| 535 octave_env::error (int err_num) const | |
| 536 { | |
| 537 (*current_liboctave_error_handler) ("%s", strerror (err_num)); | |
| 538 } | |
| 539 | |
| 540 void | |
| 3504 | 541 octave_env::error (const std::string& s) const |
| 2926 | 542 { |
| 543 (*current_liboctave_error_handler) ("%s", s.c_str ()); | |
| 544 } | |
| 545 | |
| 546 /* | |
| 547 ;;; Local Variables: *** | |
| 548 ;;; mode: C++ *** | |
| 549 ;;; End: *** | |
| 550 */ |