Mercurial > hg > xemacs-beta
annotate src/realpath.c @ 4913:fc28cc192c91
Automated merge with http://hg.debian.org/hg/xemacs/xemacs
| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Mon, 01 Feb 2010 23:14:46 -0600 |
| parents | b3ea9c582280 |
| children | 19a72041c5ed |
| rev | line source |
|---|---|
| 428 | 1 /* |
| 2 * realpath.c -- canonicalize pathname by removing symlinks | |
| 3 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> | |
| 2526 | 4 * Copyright (C) 2001, 2002, 2004 Ben Wing. |
| 428 | 5 * |
| 6 | |
| 7 This file is part of XEmacs. | |
| 8 | |
| 9 XEmacs is free software; you can redistribute it and/or modify it | |
| 10 under the terms of the GNU General Public License as published by the | |
| 11 Free Software Foundation; either version 2, or (at your option) any | |
| 12 later version. | |
| 13 | |
| 14 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 17 for more details. | |
| 18 | |
| 19 You should have received a copy of the GNU General Public License | |
| 20 along with XEmacs; see the file COPYING. If not, write to | |
| 21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 22 Boston, MA 02111-1307, USA. */ | |
| 23 | |
| 24 /* Synched up with: Not in FSF. */ | |
| 25 | |
| 771 | 26 /* This file has been Mule-ized, June 2001 by Ben Wing. |
| 27 | |
| 28 Everything in this file now works in terms of internal, not external, | |
| 29 data. This is the only way to be safe, and it makes the code cleaner. */ | |
| 30 | |
| 428 | 31 #include <config.h> |
| 446 | 32 #include "lisp.h" |
| 442 | 33 |
| 2526 | 34 #include "profile.h" |
| 35 | |
| 558 | 36 #include "sysfile.h" |
| 1116 | 37 #include "sysdir.h" |
| 428 | 38 |
| 771 | 39 #define MAX_READLINKS 32 |
| 40 | |
| 1116 | 41 #ifdef WIN32_ANY |
| 446 | 42 #include "syswindows.h" |
| 43 #ifndef ELOOP | |
| 44 #define ELOOP 10062 /* = WSAELOOP in winsock.h */ | |
| 45 #endif | |
| 1116 | 46 #endif |
| 47 | |
| 2526 | 48 Lisp_Object QSin_qxe_realpath; |
| 49 | |
| 446 | 50 /* Length of start of absolute filename. */ |
| 51 static int | |
| 1116 | 52 abs_start (const Ibyte *name) |
| 446 | 53 { |
| 1116 | 54 #ifdef WIN32_ANY |
| 446 | 55 if (isalpha (*name) && IS_DEVICE_SEP (name[1]) |
| 56 && IS_DIRECTORY_SEP (name[2])) | |
| 57 return 3; | |
| 58 else if (IS_DIRECTORY_SEP (*name)) | |
| 59 return IS_DIRECTORY_SEP (name[1]) ? 2 : 1; | |
| 60 else | |
| 61 return 0; | |
| 1116 | 62 #else /* not WIN32_ANY */ |
| 63 return IS_DIRECTORY_SEP (*name) ? 1 : 0; | |
| 64 #endif | |
| 446 | 65 } |
| 1116 | 66 |
| 2526 | 67 /* Find real name of a file by resolving symbolic links and/or shortcuts |
| 68 under Windows (.LNK links), if such support is enabled. | |
| 69 | |
| 70 If no link found, and LINKS_ONLY is false, look up the correct case in | |
| 71 the file system of the last component. | |
| 1116 | 72 |
| 73 Under Windows, UNC servers and shares are lower-cased. Directories must | |
| 74 be given without trailing '/'. One day, this could read Win2K's reparse | |
| 2526 | 75 points. |
| 76 | |
| 77 Returns length of characters copied info BUF. | |
| 78 DOES NOT ZERO TERMINATE!!!!! | |
| 79 */ | |
| 1116 | 80 |
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81 #ifdef REALPATH_CORRECTS_CASE /* Darwin */ |
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82 #include <sys/param.h> |
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83 #include <stdlib.h> |
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84 #endif |
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85 |
| 1116 | 86 static int |
| 2526 | 87 readlink_or_correct_case (const Ibyte *name, Ibyte *buf, Bytecount size, |
| 3042 | 88 #ifndef WIN32_ANY |
| 3044 | 89 Boolint UNUSED (links_only) |
| 3042 | 90 #else |
| 3044 | 91 Boolint links_only |
| 3042 | 92 #endif |
| 3044 | 93 ) |
| 1116 | 94 { |
| 95 #ifndef WIN32_ANY | |
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96 #ifdef REALPATH_CORRECTS_CASE |
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97 /* Darwin's realpath corrects file name case, so we want to use that |
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98 here, as well as our own, non-case-correcting, implementation |
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99 further down in this file. |
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100 |
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101 It might be reasonable to incorporate case correction in our own |
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102 realpath implementation, which would help things with |
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103 case-insensitive file systems on Linux; one way to do this would |
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104 be to make sure that init_initial_directory and |
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105 get_initial_directory always give the correct case. */ |
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106 int n = qxe_readlink (name, buf, (size_t) size); |
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107 Extbyte realpath_buf[PATH_MAX], *tmp; |
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108 DECLARE_EISTRING (realpathing); |
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109 |
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110 if (n >= 0 || errno != EINVAL) |
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111 return n; |
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112 |
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113 eicpy_rawz (realpathing, name); |
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114 eito_external (realpathing, Qfile_name); |
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115 tmp = realpath (eiextdata (realpathing), realpath_buf); |
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116 |
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117 if (!tmp) |
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118 return -1; |
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119 |
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120 if (0 == memcmp (eiextdata (realpathing), realpath_buf, |
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121 eiextlen (realpathing))) |
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122 { |
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123 /* No case change needed; tell the caller that. */ |
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124 errno = EINVAL; |
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125 return -1; |
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126 } |
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127 |
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128 eireset (realpathing); |
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129 eicpy_ext (realpathing, realpath_buf, Qfile_name); |
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130 if (eilen (realpathing) > size) |
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131 { |
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132 errno = ERANGE; |
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133 return -1; |
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134 } |
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135 |
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136 memcpy (buf, eidata (realpathing), eilen (realpathing)); |
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137 return eilen (realpathing); |
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138 #else /* !REALPATH_CORRECTS_CASE */ |
| 2526 | 139 return qxe_readlink (name, buf, (size_t) size); |
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140 #endif /* REALPATH_CORRECTS_CASE */ |
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141 #else /* defined (WIN32_ANY) */ |
| 1116 | 142 # ifdef CYGWIN |
| 2526 | 143 int n = qxe_readlink (name, buf, (size_t) size); |
| 1116 | 144 if (n >= 0 || errno != EINVAL) |
| 145 return n; | |
| 146 | |
| 147 /* The file may exist, but isn't a symlink. Try to find the | |
| 148 right name. */ | |
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149 LOCAL_FILE_FORMAT_TO_INTERNAL_MSWIN (name, name); |
| 2526 | 150 # else |
| 151 if (mswindows_shortcuts_are_symlinks) | |
| 152 { | |
| 153 Ibyte *tmp = mswindows_read_link (name); | |
| 154 | |
| 155 if (tmp != NULL) | |
| 156 { | |
| 157 /* Fucking fixed buffers. */ | |
| 158 Bytecount len = qxestrlen (tmp); | |
| 159 if (len > size) | |
| 160 { | |
| 161 errno = ENAMETOOLONG; | |
| 162 return -1; | |
| 163 } | |
| 164 memcpy (buf, tmp, len); | |
| 165 xfree (tmp, Ibyte *); | |
| 166 return len; | |
| 167 } | |
| 168 } | |
| 1116 | 169 # endif |
| 170 | |
| 2526 | 171 if (links_only) |
| 172 { | |
| 173 errno = EINVAL; | |
| 174 return -1; | |
| 175 } | |
| 176 | |
| 1116 | 177 { |
| 178 int len = 0; | |
| 179 int err = 0; | |
| 180 const Ibyte *lastname; | |
| 181 int count = 0; | |
| 1204 | 182 const Ibyte *nn; |
| 1116 | 183 DECLARE_EISTRING (result); |
| 184 | |
| 185 assert (*name); | |
| 186 | |
| 187 /* Sort of check we have a valid filename. */ | |
| 188 if (qxestrpbrk (name, "*?|<>\"")) | |
| 189 { | |
| 190 errno = ENOENT; | |
| 191 return -1; | |
| 192 } | |
| 2421 | 193 else if (qxestrlen (name) >= PATH_MAX_INTERNAL) |
| 1116 | 194 { |
| 195 errno = ENAMETOOLONG; | |
| 196 return -1; | |
| 197 } | |
| 198 | |
| 199 /* Find start of filename */ | |
| 200 lastname = name + qxestrlen (name); | |
| 201 while (lastname > name && !IS_DIRECTORY_SEP (lastname[-1])) | |
| 202 --lastname; | |
| 203 | |
| 204 /* Count slashes in unc path */ | |
| 205 if (abs_start (name) == 2) | |
| 1204 | 206 for (nn = name; *nn; nn++) |
| 207 if (IS_DIRECTORY_SEP (*nn)) | |
| 1116 | 208 count++; |
| 209 | |
| 210 if (count >= 2 && count < 4) | |
| 211 { | |
| 212 eicpy_rawz (result, lastname); | |
| 213 eilwr (result); | |
| 214 } | |
| 215 else | |
| 216 { | |
| 217 WIN32_FIND_DATAW find_data; | |
| 218 Extbyte *nameext; | |
| 219 HANDLE dir_handle; | |
| 220 | |
| 221 C_STRING_TO_TSTR (name, nameext); | |
| 222 dir_handle = qxeFindFirstFile (nameext, &find_data); | |
| 223 if (dir_handle == INVALID_HANDLE_VALUE) | |
| 224 { | |
| 225 errno = ENOENT; | |
| 226 return -1; | |
| 227 } | |
| 228 eicpy_ext (result, (Extbyte *) find_data.cFileName, Qmswindows_tstr); | |
| 229 FindClose (dir_handle); | |
| 230 } | |
| 231 | |
| 2526 | 232 if ((len = eilen (result)) <= size) |
| 1116 | 233 { |
| 234 DECLARE_EISTRING (eilastname); | |
| 235 | |
| 236 eicpy_rawz (eilastname, lastname); | |
| 237 if (eicmp_ei (eilastname, result) == 0) | |
| 2526 | 238 /* Signal that the name is already OK. */ |
| 239 err = EINVAL; | |
| 1116 | 240 else |
| 2526 | 241 memcpy (buf, eidata (result), len); |
| 1116 | 242 } |
| 243 else | |
| 244 err = ENAMETOOLONG; | |
| 245 | |
| 246 errno = err; | |
| 247 return err ? -1 : len; | |
| 248 } | |
| 249 #endif /* WIN32_ANY */ | |
| 250 } | |
| 446 | 251 |
| 771 | 252 /* Mule Note: This function works with and returns |
| 2526 | 253 internally-formatted strings. |
| 254 | |
| 255 if LINKS_ONLY is true, don't do case canonicalization under | |
| 256 Windows. */ | |
| 440 | 257 |
| 867 | 258 Ibyte * |
| 2526 | 259 qxe_realpath (const Ibyte *path, Ibyte *resolved_path, Boolint links_only) |
| 428 | 260 { |
| 2421 | 261 Ibyte copy_path[PATH_MAX_INTERNAL]; |
| 867 | 262 Ibyte *new_path = resolved_path; |
| 263 Ibyte *max_path; | |
| 2526 | 264 Ibyte *retval = NULL; |
| 1116 | 265 #if defined (HAVE_READLINK) || defined (WIN32_ANY) |
| 428 | 266 int readlinks = 0; |
| 2421 | 267 Ibyte link_path[PATH_MAX_INTERNAL]; |
| 428 | 268 int n; |
| 1116 | 269 int abslen = abs_start (path); |
| 428 | 270 #endif |
| 271 | |
| 2526 | 272 PROFILE_DECLARE (); |
| 273 | |
| 274 PROFILE_RECORD_ENTERING_SECTION (QSin_qxe_realpath); | |
| 275 | |
| 1760 | 276 restart: |
| 277 | |
| 428 | 278 /* Make a copy of the source path since we may need to modify it. */ |
| 771 | 279 qxestrcpy (copy_path, path); |
| 428 | 280 path = copy_path; |
| 2421 | 281 max_path = copy_path + PATH_MAX_INTERNAL - 2; |
| 446 | 282 |
| 819 | 283 if (0) |
| 284 ; | |
| 1116 | 285 #ifdef WIN32_ANY |
| 446 | 286 /* Check for c:/... or //server/... */ |
| 988 | 287 else if (abslen == 3 || abslen == 2) |
| 428 | 288 { |
| 462 | 289 /* Make sure drive letter is lowercased. */ |
| 1116 | 290 if (abslen == 3) |
| 291 { | |
| 292 *new_path = tolower (*path); | |
| 293 new_path++; | |
| 294 path++; | |
| 295 abslen--; | |
| 296 } | |
| 988 | 297 /* Coerce directory chars. */ |
| 1116 | 298 while (abslen-- > 0) |
| 299 { | |
| 300 if (IS_DIRECTORY_SEP (*path)) | |
| 301 *new_path++ = DIRECTORY_SEP; | |
| 302 else | |
| 303 *new_path++ = *path; | |
| 304 path++; | |
| 305 } | |
| 428 | 306 } |
| 819 | 307 #endif |
| 308 #ifdef WIN32_NATIVE | |
| 446 | 309 /* No drive letter, but a beginning slash? Prepend drive letter. */ |
| 310 else if (abslen == 1) | |
| 428 | 311 { |
| 2421 | 312 get_initial_directory (new_path, PATH_MAX_INTERNAL - 1); |
| 428 | 313 new_path += 3; |
| 314 path++; | |
| 315 } | |
| 446 | 316 /* Just a path name, prepend the current directory */ |
| 1116 | 317 else |
| 428 | 318 { |
| 2421 | 319 get_initial_directory (new_path, PATH_MAX_INTERNAL - 1); |
| 771 | 320 new_path += qxestrlen (new_path); |
| 446 | 321 if (!IS_DIRECTORY_SEP (new_path[-1])) |
| 322 *new_path++ = DIRECTORY_SEP; | |
| 428 | 323 } |
| 324 #else | |
| 771 | 325 /* If it's a relative pathname use get_initial_directory for starters. */ |
| 819 | 326 else if (abslen == 0) |
| 428 | 327 { |
| 2421 | 328 get_initial_directory (new_path, PATH_MAX_INTERNAL - 1); |
| 771 | 329 new_path += qxestrlen (new_path); |
| 446 | 330 if (!IS_DIRECTORY_SEP (new_path[-1])) |
| 331 *new_path++ = DIRECTORY_SEP; | |
| 428 | 332 } |
| 333 else | |
| 334 { | |
| 446 | 335 /* Copy first directory sep. May have two on cygwin. */ |
| 771 | 336 qxestrncpy (new_path, path, abslen); |
| 446 | 337 new_path += abslen; |
| 338 path += abslen; | |
| 428 | 339 } |
| 340 #endif | |
| 341 /* Expand each slash-separated pathname component. */ | |
| 342 while (*path != '\0') | |
| 343 { | |
| 344 /* Ignore stray "/". */ | |
| 446 | 345 if (IS_DIRECTORY_SEP (*path)) |
| 428 | 346 { |
| 347 path++; | |
| 348 continue; | |
| 349 } | |
| 350 | |
| 351 if (*path == '.') | |
| 352 { | |
| 353 /* Ignore ".". */ | |
| 446 | 354 if (path[1] == '\0' || IS_DIRECTORY_SEP (path[1])) |
| 428 | 355 { |
| 356 path++; | |
| 357 continue; | |
| 358 } | |
| 359 | |
| 442 | 360 /* Handle ".." */ |
| 361 if (path[1] == '.' && | |
| 446 | 362 (path[2] == '\0' || IS_DIRECTORY_SEP (path[2]))) |
| 428 | 363 { |
| 442 | 364 path += 2; |
| 428 | 365 |
| 442 | 366 /* Ignore ".." at root. */ |
| 1116 | 367 if (new_path == resolved_path + abs_start (resolved_path)) |
| 442 | 368 continue; |
| 428 | 369 |
| 442 | 370 /* Handle ".." by backing up. */ |
| 446 | 371 --new_path; |
| 372 while (!IS_DIRECTORY_SEP (new_path[-1])) | |
| 373 --new_path; | |
| 442 | 374 continue; |
| 428 | 375 } |
| 376 } | |
| 377 | |
| 378 /* Safely copy the next pathname component. */ | |
| 446 | 379 while (*path != '\0' && !IS_DIRECTORY_SEP (*path)) |
| 428 | 380 { |
| 381 if (path > max_path) | |
| 382 { | |
| 383 errno = ENAMETOOLONG; | |
| 2526 | 384 goto done; |
| 428 | 385 } |
| 386 *new_path++ = *path++; | |
| 387 } | |
| 388 | |
| 1116 | 389 #if defined (HAVE_READLINK) || defined (WIN32_ANY) |
| 771 | 390 /* See if latest pathname component is a symlink or needs case |
| 391 correction. */ | |
| 428 | 392 *new_path = '\0'; |
| 2526 | 393 n = readlink_or_correct_case (resolved_path, link_path, |
| 394 PATH_MAX_INTERNAL - 1, links_only); | |
| 428 | 395 |
| 396 if (n < 0) | |
| 397 { | |
| 771 | 398 /* EINVAL means the file exists but isn't a symlink or doesn't |
| 399 need case correction. */ | |
| 1116 | 400 #ifdef WIN32_ANY |
| 462 | 401 if (errno != EINVAL && errno != ENOENT) |
| 402 #else | |
| 403 if (errno != EINVAL) | |
| 404 #endif | |
| 2526 | 405 goto done; |
| 428 | 406 } |
| 407 else | |
| 408 { | |
| 409 /* Protect against infinite loops. */ | |
| 410 if (readlinks++ > MAX_READLINKS) | |
| 411 { | |
| 412 errno = ELOOP; | |
| 2526 | 413 goto done; |
| 428 | 414 } |
| 415 | |
| 416 /* Note: readlink doesn't add the null byte. */ | |
| 417 link_path[n] = '\0'; | |
| 446 | 418 |
| 1760 | 419 abslen = abs_start (link_path); |
| 420 if (abslen > 0) | |
| 421 { | |
| 422 /* Start over for an absolute symlink. */ | |
| 423 new_path = resolved_path; | |
| 424 qxestrcat (link_path, path); | |
| 425 path = link_path; | |
| 426 goto restart; | |
| 427 } | |
| 428 | |
| 429 /* Otherwise back up over this component. */ | |
| 430 for (--new_path; !IS_DIRECTORY_SEP (*new_path); --new_path) | |
| 431 assert (new_path > resolved_path); | |
| 428 | 432 |
| 433 /* Safe sex check. */ | |
| 2421 | 434 if (qxestrlen (path) + n >= PATH_MAX_INTERNAL) |
| 428 | 435 { |
| 436 errno = ENAMETOOLONG; | |
| 2526 | 437 goto done; |
| 428 | 438 } |
| 439 | |
| 440 /* Insert symlink contents into path. */ | |
| 771 | 441 qxestrcat (link_path, path); |
| 442 qxestrcpy (copy_path, link_path); | |
| 428 | 443 path = copy_path; |
| 444 } | |
| 1116 | 445 #endif /* HAVE_READLINK || WIN32_ANY */ |
| 446 | 446 *new_path++ = DIRECTORY_SEP; |
| 428 | 447 } |
| 448 | |
| 449 /* Delete trailing slash but don't whomp a lone slash. */ | |
| 1116 | 450 if (new_path != resolved_path + abs_start (resolved_path) && |
| 771 | 451 IS_DIRECTORY_SEP (new_path[-1])) |
| 428 | 452 new_path--; |
| 453 | |
| 454 /* Make sure it's null terminated. */ | |
| 455 *new_path = '\0'; | |
| 446 | 456 |
| 2526 | 457 retval = resolved_path; |
| 458 done: | |
| 459 PROFILE_RECORD_EXITING_SECTION (QSin_qxe_realpath); | |
| 460 return retval; | |
| 428 | 461 } |
| 2526 | 462 |
| 463 void | |
| 464 vars_of_realpath (void) | |
| 465 { | |
| 466 QSin_qxe_realpath = | |
| 467 build_msg_string ("(in qxe_realpath)"); | |
| 468 staticpro (&QSin_qxe_realpath); | |
| 469 } |