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annotate liboctave/oct-env.cc @ 11523:fd0a3ac60b0e
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| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 14 Jan 2011 05:47:45 -0500 |
| parents | 2f29b765c0ef |
| children | 12df7854fa7c |
| rev | line source |
|---|---|
| 2926 | 1 /* |
| 2 | |
| 11523 | 3 Copyright (C) 1996-2011 John W. Eaton |
| 2926 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
| 10 option) any later version. | |
| 2926 | 11 |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 7016 | 18 along with Octave; see the file COPYING. If not, see |
| 19 <http://www.gnu.org/licenses/>. | |
| 2926 | 20 |
| 21 */ | |
| 22 | |
| 23 /* | |
| 24 | |
| 25 The functions listed below were adapted from a similar functions | |
| 26 from GNU Bash, the Bourne Again SHell, copyright (C) 1987, 1989, 1991 | |
| 27 Free Software Foundation, Inc. | |
| 28 | |
| 29 octave_env::do_absolute_pathname | |
| 30 octave_env::do_base_pathname | |
| 31 octave_env::do_chdir | |
| 32 octave_env::do_getcwd | |
| 33 octave_env::do_make_absolute | |
| 34 octave_env::do_polite_directory_format | |
| 35 octave_env::pathname_backup | |
| 36 | |
| 37 */ | |
| 38 | |
| 39 #ifdef HAVE_CONFIG_H | |
| 40 #include <config.h> | |
| 41 #endif | |
| 42 | |
| 4093 | 43 #include <cctype> |
| 2926 | 44 #include <cstdlib> |
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45 #include <cstring> |
| 4093 | 46 |
| 3504 | 47 #include <string> |
| 2926 | 48 |
| 49 #include <sys/types.h> | |
| 50 #include <unistd.h> | |
| 51 | |
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52 #include "progname.h" |
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53 |
| 4097 | 54 #include "file-ops.h" |
| 2926 | 55 #include "lo-error.h" |
| 56 #include "lo-sysdep.h" | |
| 57 #include "lo-utils.h" | |
| 58 #include "oct-env.h" | |
| 2934 | 59 #include "oct-passwd.h" |
| 2947 | 60 #include "oct-syscalls.h" |
| 2926 | 61 |
| 62 octave_env::octave_env (void) | |
| 63 : follow_symbolic_links (true), verbatim_pwd (true), | |
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64 current_directory (), prog_name (), prog_invocation_name (), |
| 2926 | 65 user_name (), host_name () |
| 66 { | |
| 67 // Get a real value for the current directory. | |
| 68 do_getcwd (); | |
| 69 | |
| 70 // Etc. | |
| 71 do_get_user_name (); | |
| 72 | |
| 73 do_get_host_name (); | |
| 74 } | |
| 75 | |
| 76 octave_env *octave_env::instance = 0; | |
| 77 | |
| 78 bool | |
| 79 octave_env::instance_ok (void) | |
| 80 { | |
| 81 bool retval = true; | |
| 82 | |
| 83 if (! instance) | |
| 84 instance = new octave_env (); | |
| 85 | |
| 86 if (! instance) | |
| 87 { | |
| 88 (*current_liboctave_error_handler) | |
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89 ("unable to create current working directory object!"); |
| 2926 | 90 |
| 91 retval = false; | |
| 92 } | |
| 93 | |
| 94 return retval; | |
| 95 } | |
| 96 | |
| 3504 | 97 std::string |
| 98 octave_env::polite_directory_format (const std::string& name) | |
| 2926 | 99 { |
| 100 return (instance_ok ()) | |
| 3504 | 101 ? instance->do_polite_directory_format (name) : std::string (); |
| 2926 | 102 } |
| 103 | |
| 104 bool | |
| 3504 | 105 octave_env::absolute_pathname (const std::string& s) |
| 2926 | 106 { |
| 107 return (instance_ok ()) | |
| 108 ? instance->do_absolute_pathname (s) : false; | |
| 109 } | |
| 110 | |
| 6838 | 111 bool |
| 112 octave_env::rooted_relative_pathname (const std::string& s) | |
| 113 { | |
| 114 return (instance_ok ()) | |
| 115 ? instance->do_rooted_relative_pathname (s) : false; | |
| 116 } | |
| 117 | |
| 3504 | 118 std::string |
| 119 octave_env::base_pathname (const std::string& s) | |
| 2926 | 120 { |
| 121 return (instance_ok ()) | |
| 3504 | 122 ? instance->do_base_pathname (s) : std::string (); |
| 2926 | 123 } |
| 124 | |
| 3504 | 125 std::string |
| 126 octave_env::make_absolute (const std::string& s, const std::string& dot_path) | |
| 2926 | 127 { |
| 128 return (instance_ok ()) | |
| 3504 | 129 ? instance->do_make_absolute (s, dot_path) : std::string (); |
| 2926 | 130 } |
| 131 | |
| 3504 | 132 std::string |
| 10250 | 133 octave_env::get_current_directory () |
| 2926 | 134 { |
| 135 return (instance_ok ()) | |
| 3504 | 136 ? instance->do_getcwd () : std::string (); |
| 2926 | 137 } |
| 138 | |
| 3504 | 139 std::string |
| 2926 | 140 octave_env::get_home_directory () |
| 141 { | |
| 142 return (instance_ok ()) | |
| 3504 | 143 ? instance->do_get_home_directory () : std::string (); |
| 2926 | 144 } |
| 145 | |
| 3504 | 146 std::string |
| 2926 | 147 octave_env::get_program_name (void) |
| 148 { | |
| 149 return (instance_ok ()) | |
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150 ? instance->prog_name : std::string (); |
| 2926 | 151 } |
| 152 | |
| 3504 | 153 std::string |
| 2926 | 154 octave_env::get_program_invocation_name (void) |
| 155 { | |
| 156 return (instance_ok ()) | |
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157 ? instance->prog_invocation_name : std::string (); |
| 2926 | 158 } |
| 159 | |
| 160 void | |
| 3504 | 161 octave_env::set_program_name (const std::string& s) |
| 2926 | 162 { |
| 163 if (instance_ok ()) | |
| 164 instance->do_set_program_name (s); | |
| 165 } | |
| 166 | |
| 3504 | 167 std::string |
| 2926 | 168 octave_env::get_user_name (void) |
| 169 { | |
| 170 return (instance_ok ()) | |
| 3504 | 171 ? instance->do_get_user_name () : std::string (); |
| 2926 | 172 } |
| 173 | |
| 3504 | 174 std::string |
| 2926 | 175 octave_env::get_host_name (void) |
| 176 { | |
| 177 return (instance_ok ()) | |
| 3504 | 178 ? instance->do_get_host_name () : std::string (); |
| 2926 | 179 } |
| 180 | |
| 5775 | 181 // FIXME -- this leaves no way to distinguish between a |
| 2926 | 182 // variable that is not set and one that is set to the empty string. |
| 183 // Is this a problem? | |
| 184 | |
| 3504 | 185 std::string |
| 186 octave_env::getenv (const std::string& name) | |
| 2926 | 187 { |
| 188 return (instance_ok ()) | |
| 3504 | 189 ? instance->do_getenv (name) : std::string (); |
| 2926 | 190 } |
| 191 | |
| 192 void | |
| 3504 | 193 octave_env::putenv (const std::string& name, const std::string& value) |
| 2926 | 194 { |
| 195 octave_putenv (name, value); | |
| 196 } | |
| 197 | |
| 198 bool | |
| 5489 | 199 octave_env::have_x11_display (void) |
| 200 { | |
| 201 std::string display = getenv ("DISPLAY"); | |
| 202 | |
| 203 return ! display.empty (); | |
| 204 } | |
| 205 | |
| 206 bool | |
| 3504 | 207 octave_env::chdir (const std::string& newdir) |
| 2926 | 208 { |
| 209 return (instance_ok ()) | |
| 210 ? instance->do_chdir (newdir) : false; | |
| 211 } | |
| 212 | |
| 213 void | |
| 3504 | 214 octave_env::do_set_program_name (const std::string& s) const |
| 2926 | 215 { |
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216 // For gnulib. |
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217 ::set_program_name (s.c_str ()); |
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218 |
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219 // Let gnulib strip off things like the "lt-" prefix from libtool. |
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220 prog_invocation_name = program_name; |
| 2926 | 221 |
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222 size_t pos |
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223 = prog_invocation_name.find_last_of (file_ops::dir_sep_chars ()); |
| 2926 | 224 |
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225 // Also keep a shortened version of the program name. |
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226 prog_name = (pos == std::string::npos) |
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227 ? prog_invocation_name : prog_invocation_name.substr (pos+1); |
| 2926 | 228 } |
| 229 | |
| 230 // Return a pretty pathname. If the first part of the pathname is the | |
| 231 // same as $HOME, then replace that with `~'. | |
| 232 | |
| 3504 | 233 std::string |
| 234 octave_env::do_polite_directory_format (const std::string& name) const | |
| 2926 | 235 { |
| 3504 | 236 std::string retval; |
| 2926 | 237 |
| 3504 | 238 std::string home_dir = do_get_home_directory (); |
| 2926 | 239 |
| 240 size_t len = home_dir.length (); | |
| 241 | |
| 3516 | 242 if (len > 1 && home_dir == name.substr (0, len) |
| 4097 | 243 && (name.length () == len || file_ops::is_dir_sep (name[len]))) |
| 2926 | 244 { |
| 245 retval = "~"; | |
| 246 retval.append (name.substr (len)); | |
| 247 } | |
| 248 else | |
| 249 retval = name; | |
| 250 | |
| 251 return retval; | |
| 252 } | |
| 253 | |
| 254 bool | |
| 3504 | 255 octave_env::do_absolute_pathname (const std::string& s) const |
| 2926 | 256 { |
| 4087 | 257 size_t len = s.length (); |
| 258 | |
| 259 if (len == 0) | |
| 260 return false; | |
| 2926 | 261 |
| 4097 | 262 if (file_ops::is_dir_sep (s[0])) |
| 2926 | 263 return true; |
| 264 | |
| 4101 | 265 #if defined (OCTAVE_HAVE_WINDOWS_FILESYSTEM) |
| 4088 | 266 if ((len == 2 && isalpha (s[0]) && s[1] == ':') |
| 4097 | 267 || (len > 2 && isalpha (s[0]) && s[1] == ':' |
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268 && file_ops::is_dir_sep (s[2]))) |
| 4087 | 269 return true; |
| 270 #endif | |
| 271 | |
| 2926 | 272 return false; |
| 273 } | |
| 274 | |
| 6838 | 275 bool |
| 276 octave_env::do_rooted_relative_pathname (const std::string& s) const | |
| 277 { | |
| 278 size_t len = s.length (); | |
| 279 | |
| 280 if (len == 0) | |
| 281 return false; | |
| 282 | |
| 283 if (len == 1 && s[0] == '.') | |
| 284 return true; | |
| 285 | |
| 286 if (len > 1 && s[0] == '.' && file_ops::is_dir_sep (s[1])) | |
| 287 return true; | |
| 288 | |
| 289 if (len == 2 && s[0] == '.' && s[1] == '.') | |
| 290 return true; | |
| 291 | |
| 292 if (len > 2 && s[0] == '.' && s[1] == '.' && file_ops::is_dir_sep (s[2])) | |
| 293 return true; | |
| 294 | |
| 295 return false; | |
| 296 } | |
| 297 | |
| 2926 | 298 // Return the `basename' of the pathname in STRING (the stuff after |
| 4097 | 299 // the last directory separator). If STRING is not a full pathname, |
| 300 // simply return it. | |
| 2926 | 301 |
| 3504 | 302 std::string |
| 303 octave_env::do_base_pathname (const std::string& s) const | |
| 2926 | 304 { |
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305 if (! (do_absolute_pathname (s) || do_rooted_relative_pathname (s))) |
| 2926 | 306 return s; |
| 307 | |
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308 size_t pos = s.find_last_of (file_ops::dir_sep_chars ()); |
| 2926 | 309 |
| 8021 | 310 if (pos == std::string::npos) |
| 2926 | 311 return s; |
| 312 else | |
| 313 return s.substr (pos+1); | |
| 314 } | |
| 315 | |
| 316 // Turn STRING (a pathname) into an absolute pathname, assuming that | |
| 4097 | 317 // DOT_PATH contains the symbolic location of the current directory. |
| 2926 | 318 |
| 3504 | 319 std::string |
| 320 octave_env::do_make_absolute (const std::string& s, | |
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321 const std::string& dot_path) const |
| 2926 | 322 { |
| 4087 | 323 if (dot_path.empty () || s.empty () || do_absolute_pathname (s)) |
| 2926 | 324 return s; |
| 325 | |
| 4097 | 326 std::string current_dir = dot_path; |
| 2926 | 327 |
| 4097 | 328 if (current_dir.empty ()) |
| 329 current_dir = do_getcwd (); | |
| 2926 | 330 |
| 4097 | 331 size_t pos = current_dir.length () - 1; |
| 2926 | 332 |
| 4097 | 333 if (! file_ops::is_dir_sep (current_dir[pos])) |
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334 current_dir.append (file_ops::dir_sep_str ()); |
| 4097 | 335 |
| 5775 | 336 // FIXME -- this is probably not correct for all systems. |
| 2926 | 337 |
| 338 size_t i = 0; | |
| 339 size_t slen = s.length (); | |
| 340 | |
| 341 while (i < slen) | |
| 342 { | |
| 343 if (s[i] == '.') | |
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344 { |
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345 if (i + 1 == slen) |
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346 return current_dir; |
| 2926 | 347 |
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348 if (file_ops::is_dir_sep (s[i+1])) |
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349 { |
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350 i += 2; |
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351 continue; |
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352 } |
| 2926 | 353 |
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354 if (s[i+1] == '.' |
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355 && (i + 2 == slen || file_ops::is_dir_sep (s[i+2]))) |
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356 { |
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357 i += 2; |
| 2926 | 358 |
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359 if (i != slen) |
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360 i++; |
| 2926 | 361 |
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362 pathname_backup (current_dir, 1); |
| 2926 | 363 |
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364 continue; |
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365 } |
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366 } |
| 2926 | 367 |
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368 size_t tmp = s.find_first_of (file_ops::dir_sep_chars (), i); |
| 2926 | 369 |
| 8021 | 370 if (tmp == std::string::npos) |
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371 { |
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372 current_dir.append (s, i, tmp-i); |
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373 break; |
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374 } |
| 2926 | 375 else |
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376 { |
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377 current_dir.append (s, i, tmp-i+1); |
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378 i = tmp + 1; |
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379 } |
| 2926 | 380 } |
| 381 | |
| 4097 | 382 return current_dir; |
| 2926 | 383 } |
| 384 | |
| 4097 | 385 // Return a string which is the current working directory. |
| 2926 | 386 |
| 3504 | 387 std::string |
| 4097 | 388 octave_env::do_getcwd () const |
| 2926 | 389 { |
| 390 if (! follow_symbolic_links) | |
| 391 current_directory = ""; | |
| 392 | |
| 393 if (verbatim_pwd || current_directory.empty ()) | |
| 394 current_directory = ::octave_getcwd (); | |
| 395 | |
| 396 return current_directory; | |
| 397 } | |
| 398 | |
| 399 // This value is not cached because it can change while Octave is | |
| 400 // running. | |
| 401 | |
| 3504 | 402 std::string |
| 2926 | 403 octave_env::do_get_home_directory (void) const |
| 404 { | |
| 3504 | 405 std::string hd = do_getenv ("HOME"); |
| 2926 | 406 |
| 6096 | 407 #if defined (__MINGW32__) || defined (_MSC_VER) |
| 408 // Maybe we are started directly from cmd.exe. | |
| 5451 | 409 if (hd.empty ()) |
| 5454 | 410 { |
| 411 std::string drv = do_getenv ("HOMEDRIVE"); | |
| 412 if (drv.empty ()) | |
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413 hd = do_getenv ("HOMEPATH"); |
| 5454 | 414 else |
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415 hd = drv + do_getenv ("HOMEPATH"); |
| 5454 | 416 } |
| 5451 | 417 #endif |
| 418 | |
| 2947 | 419 if (hd.empty ()) |
| 420 { | |
| 421 octave_passwd pw = octave_passwd::getpwuid (octave_syscalls::getuid ()); | |
| 422 | |
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423 hd = pw ? pw.dir () : std::string (file_ops::dir_sep_str ()); |
| 2947 | 424 } |
| 425 | |
| 426 return hd; | |
| 2926 | 427 } |
| 428 | |
| 3504 | 429 std::string |
| 2926 | 430 octave_env::do_get_user_name (void) const |
| 431 { | |
| 432 if (user_name.empty ()) | |
| 433 { | |
| 2947 | 434 octave_passwd pw = octave_passwd::getpwuid (octave_syscalls::getuid ()); |
| 2926 | 435 |
| 3504 | 436 user_name = pw ? pw.name () : std::string ("unknown"); |
| 2926 | 437 } |
| 438 | |
| 439 return user_name; | |
| 440 } | |
| 441 | |
| 3504 | 442 std::string |
| 2926 | 443 octave_env::do_get_host_name (void) const |
| 444 { | |
| 445 if (host_name.empty ()) | |
| 446 { | |
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447 char hostname[1024]; |
| 2926 | 448 |
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449 int status = gnulib::gethostname (hostname, 1023); |
| 2926 | 450 |
| 3185 | 451 host_name = (status < 0) ? "unknown" : hostname; |
| 2926 | 452 } |
| 453 | |
| 454 return host_name; | |
| 455 } | |
| 456 | |
| 3504 | 457 std::string |
| 458 octave_env::do_getenv (const std::string& name) const | |
| 2926 | 459 { |
| 460 char *value = ::getenv (name.c_str ()); | |
| 461 | |
| 462 return value ? value : ""; | |
| 463 } | |
| 464 | |
| 465 // Do the work of changing to the directory NEWDIR. Handle symbolic | |
| 466 // link following, etc. | |
| 467 | |
| 468 bool | |
| 3504 | 469 octave_env::do_chdir (const std::string& newdir) |
| 2926 | 470 { |
| 471 bool retval = false; | |
| 472 | |
| 3504 | 473 std::string tmp; |
| 2926 | 474 |
| 475 if (follow_symbolic_links) | |
| 476 { | |
| 477 if (current_directory.empty ()) | |
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478 do_getcwd (); |
| 2926 | 479 |
| 480 if (current_directory.empty ()) | |
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481 tmp = newdir; |
| 2926 | 482 else |
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483 tmp = do_make_absolute (newdir, current_directory); |
| 2926 | 484 |
| 4097 | 485 // Get rid of trailing directory separator. |
| 2926 | 486 |
| 487 size_t len = tmp.length (); | |
| 488 | |
| 489 if (len > 1) | |
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490 { |
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491 if (file_ops::is_dir_sep (tmp[--len])) |
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492 tmp.resize (len); |
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493 } |
| 2926 | 494 |
| 495 if (! ::octave_chdir (tmp)) | |
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496 { |
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497 current_directory = tmp; |
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498 retval = true; |
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499 } |
| 2926 | 500 } |
| 501 else | |
| 502 retval = (! ::octave_chdir (newdir)); | |
| 503 | |
| 504 return retval; | |
| 505 } | |
| 506 | |
| 507 // Remove the last N directories from PATH. | |
| 508 | |
| 509 void | |
| 3504 | 510 octave_env::pathname_backup (std::string& path, int n) const |
| 2926 | 511 { |
| 512 if (path.empty ()) | |
| 513 return; | |
| 514 | |
| 515 size_t i = path.length () - 1; | |
| 516 | |
| 517 while (n--) | |
| 518 { | |
| 4097 | 519 while (file_ops::is_dir_sep (path[i]) && i > 0) |
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520 i--; |
| 2926 | 521 |
| 4097 | 522 while (! file_ops::is_dir_sep (path[i]) && i > 0) |
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523 i--; |
| 2926 | 524 |
| 525 i++; | |
| 526 } | |
| 527 | |
| 528 path.resize (i); | |
| 529 } | |
| 530 | |
| 531 void | |
| 532 octave_env::error (int err_num) const | |
| 533 { | |
| 10411 | 534 (*current_liboctave_error_handler) ("%s", gnulib::strerror (err_num)); |
| 2926 | 535 } |
| 536 | |
| 537 void | |
| 3504 | 538 octave_env::error (const std::string& s) const |
| 2926 | 539 { |
| 540 (*current_liboctave_error_handler) ("%s", s.c_str ()); | |
| 541 } |