Mercurial > hg > xemacs-beta
annotate src/realpath.c @ 5580:a0e81357194e
Move macros with shadows in bytecomp.el to the end of the files, cl-macs
lisp/ChangeLog addition:
2011-10-08 Aidan Kehoe <kehoea@parhasard.net>
* cl-macs.el:
* cl-macs.el (load-time-value):
* cl-macs.el (flet):
* cl-macs.el (labels):
* cl-macs.el (the):
* cl-macs.el (declare):
Move all these macros to the end of the file, since they're in
byte-compile-initial-macro-environment, and we don't want their
definitions to override that for the rest of the file during
byte-compilation. Happens not to matter right now, but avoids
surprises for anyone using the macros elsewhere in cl-macs down
the line.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Sat, 08 Oct 2011 12:26:09 +0100 |
| parents | 308d34e9f07d |
| children |
| 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 | |
|
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9 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 10 under the terms of the GNU General Public License as published by the |
|
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11 Free Software Foundation, either version 3 of the License, or (at your |
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12 option) any later version. |
| 428 | 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 | |
|
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20 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 21 |
| 22 /* Synched up with: Not in FSF. */ | |
| 23 | |
| 771 | 24 /* This file has been Mule-ized, June 2001 by Ben Wing. |
| 25 | |
| 26 Everything in this file now works in terms of internal, not external, | |
| 27 data. This is the only way to be safe, and it makes the code cleaner. */ | |
| 28 | |
| 428 | 29 #include <config.h> |
| 446 | 30 #include "lisp.h" |
| 442 | 31 |
| 2526 | 32 #include "profile.h" |
| 33 | |
| 558 | 34 #include "sysfile.h" |
| 1116 | 35 #include "sysdir.h" |
| 428 | 36 |
| 771 | 37 #define MAX_READLINKS 32 |
| 38 | |
| 1116 | 39 #ifdef WIN32_ANY |
| 446 | 40 #include "syswindows.h" |
| 41 #ifndef ELOOP | |
| 42 #define ELOOP 10062 /* = WSAELOOP in winsock.h */ | |
| 43 #endif | |
| 1116 | 44 #endif |
| 45 | |
| 2526 | 46 Lisp_Object QSin_qxe_realpath; |
| 47 | |
| 446 | 48 /* Length of start of absolute filename. */ |
| 49 static int | |
| 1116 | 50 abs_start (const Ibyte *name) |
| 446 | 51 { |
| 1116 | 52 #ifdef WIN32_ANY |
| 446 | 53 if (isalpha (*name) && IS_DEVICE_SEP (name[1]) |
| 54 && IS_DIRECTORY_SEP (name[2])) | |
| 55 return 3; | |
| 56 else if (IS_DIRECTORY_SEP (*name)) | |
| 57 return IS_DIRECTORY_SEP (name[1]) ? 2 : 1; | |
| 58 else | |
| 59 return 0; | |
| 1116 | 60 #else /* not WIN32_ANY */ |
| 61 return IS_DIRECTORY_SEP (*name) ? 1 : 0; | |
| 62 #endif | |
| 446 | 63 } |
| 1116 | 64 |
| 2526 | 65 /* Find real name of a file by resolving symbolic links and/or shortcuts |
| 66 under Windows (.LNK links), if such support is enabled. | |
| 67 | |
| 68 If no link found, and LINKS_ONLY is false, look up the correct case in | |
| 69 the file system of the last component. | |
| 1116 | 70 |
| 71 Under Windows, UNC servers and shares are lower-cased. Directories must | |
| 72 be given without trailing '/'. One day, this could read Win2K's reparse | |
| 2526 | 73 points. |
| 74 | |
| 75 Returns length of characters copied info BUF. | |
| 76 DOES NOT ZERO TERMINATE!!!!! | |
| 77 */ | |
| 1116 | 78 |
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79 #ifdef REALPATH_CORRECTS_CASE /* Darwin */ |
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80 #include <sys/param.h> |
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81 #include <stdlib.h> |
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82 #endif |
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83 |
| 1116 | 84 static int |
| 2526 | 85 readlink_or_correct_case (const Ibyte *name, Ibyte *buf, Bytecount size, |
| 3042 | 86 #ifndef WIN32_ANY |
| 3044 | 87 Boolint UNUSED (links_only) |
| 3042 | 88 #else |
| 3044 | 89 Boolint links_only |
| 3042 | 90 #endif |
| 3044 | 91 ) |
| 1116 | 92 { |
| 93 #ifndef WIN32_ANY | |
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94 #ifdef REALPATH_CORRECTS_CASE |
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95 /* Darwin's realpath corrects file name case, so we want to use that |
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96 here, as well as our own, non-case-correcting, implementation |
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97 further down in this file. |
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98 |
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99 It might be reasonable to incorporate case correction in our own |
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100 realpath implementation, which would help things with |
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101 case-insensitive file systems on Linux; one way to do this would |
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102 be to make sure that init_initial_directory and |
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103 get_initial_directory always give the correct case. */ |
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104 int n = qxe_readlink (name, buf, (size_t) size); |
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105 Extbyte realpath_buf[PATH_MAX], *tmp; |
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106 DECLARE_EISTRING (realpathing); |
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107 |
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108 if (n >= 0 || errno != EINVAL) |
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109 return n; |
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110 |
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111 eicpy_rawz (realpathing, name); |
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112 eito_external (realpathing, Qfile_name); |
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113 tmp = realpath (eiextdata (realpathing), realpath_buf); |
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114 |
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115 if (!tmp) |
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116 return -1; |
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117 |
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118 if (0 == memcmp (eiextdata (realpathing), realpath_buf, |
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119 eiextlen (realpathing))) |
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120 { |
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121 /* No case change needed; tell the caller that. */ |
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122 errno = EINVAL; |
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123 return -1; |
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124 } |
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125 |
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126 eireset (realpathing); |
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127 eicpy_ext (realpathing, realpath_buf, Qfile_name); |
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128 if (eilen (realpathing) > size) |
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129 { |
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130 errno = ERANGE; |
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131 return -1; |
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132 } |
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133 |
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134 memcpy (buf, eidata (realpathing), eilen (realpathing)); |
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135 return eilen (realpathing); |
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136 #else /* !REALPATH_CORRECTS_CASE */ |
| 2526 | 137 return qxe_readlink (name, buf, (size_t) size); |
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138 #endif /* REALPATH_CORRECTS_CASE */ |
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139 #else /* defined (WIN32_ANY) */ |
| 1116 | 140 # ifdef CYGWIN |
| 2526 | 141 int n = qxe_readlink (name, buf, (size_t) size); |
| 1116 | 142 if (n >= 0 || errno != EINVAL) |
| 143 return n; | |
| 144 | |
| 145 /* The file may exist, but isn't a symlink. Try to find the | |
| 146 right name. */ | |
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147 LOCAL_FILE_FORMAT_TO_INTERNAL_MSWIN (name, name); |
| 2526 | 148 # else |
| 149 if (mswindows_shortcuts_are_symlinks) | |
| 150 { | |
| 151 Ibyte *tmp = mswindows_read_link (name); | |
| 152 | |
| 153 if (tmp != NULL) | |
| 154 { | |
| 155 /* Fucking fixed buffers. */ | |
| 156 Bytecount len = qxestrlen (tmp); | |
| 157 if (len > size) | |
| 158 { | |
| 159 errno = ENAMETOOLONG; | |
| 160 return -1; | |
| 161 } | |
| 162 memcpy (buf, tmp, len); | |
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163 xfree (tmp); |
| 2526 | 164 return len; |
| 165 } | |
| 166 } | |
| 1116 | 167 # endif |
| 168 | |
| 2526 | 169 if (links_only) |
| 170 { | |
| 171 errno = EINVAL; | |
| 172 return -1; | |
| 173 } | |
| 174 | |
| 1116 | 175 { |
| 176 int len = 0; | |
| 177 int err = 0; | |
| 178 const Ibyte *lastname; | |
| 179 int count = 0; | |
| 1204 | 180 const Ibyte *nn; |
| 1116 | 181 DECLARE_EISTRING (result); |
| 182 | |
| 183 assert (*name); | |
| 184 | |
| 185 /* Sort of check we have a valid filename. */ | |
| 186 if (qxestrpbrk (name, "*?|<>\"")) | |
| 187 { | |
| 188 errno = ENOENT; | |
| 189 return -1; | |
| 190 } | |
| 2421 | 191 else if (qxestrlen (name) >= PATH_MAX_INTERNAL) |
| 1116 | 192 { |
| 193 errno = ENAMETOOLONG; | |
| 194 return -1; | |
| 195 } | |
| 196 | |
| 197 /* Find start of filename */ | |
| 198 lastname = name + qxestrlen (name); | |
| 199 while (lastname > name && !IS_DIRECTORY_SEP (lastname[-1])) | |
| 200 --lastname; | |
| 201 | |
| 202 /* Count slashes in unc path */ | |
| 203 if (abs_start (name) == 2) | |
| 1204 | 204 for (nn = name; *nn; nn++) |
| 205 if (IS_DIRECTORY_SEP (*nn)) | |
| 1116 | 206 count++; |
| 207 | |
| 208 if (count >= 2 && count < 4) | |
| 209 { | |
| 210 eicpy_rawz (result, lastname); | |
| 211 eilwr (result); | |
| 212 } | |
| 213 else | |
| 214 { | |
| 215 WIN32_FIND_DATAW find_data; | |
| 216 Extbyte *nameext; | |
| 217 HANDLE dir_handle; | |
| 218 | |
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219 nameext = ITEXT_TO_TSTR (name); |
| 1116 | 220 dir_handle = qxeFindFirstFile (nameext, &find_data); |
| 221 if (dir_handle == INVALID_HANDLE_VALUE) | |
| 222 { | |
| 223 errno = ENOENT; | |
| 224 return -1; | |
| 225 } | |
| 226 eicpy_ext (result, (Extbyte *) find_data.cFileName, Qmswindows_tstr); | |
| 227 FindClose (dir_handle); | |
| 228 } | |
| 229 | |
| 2526 | 230 if ((len = eilen (result)) <= size) |
| 1116 | 231 { |
| 232 DECLARE_EISTRING (eilastname); | |
| 233 | |
| 234 eicpy_rawz (eilastname, lastname); | |
| 235 if (eicmp_ei (eilastname, result) == 0) | |
| 2526 | 236 /* Signal that the name is already OK. */ |
| 237 err = EINVAL; | |
| 1116 | 238 else |
| 2526 | 239 memcpy (buf, eidata (result), len); |
| 1116 | 240 } |
| 241 else | |
| 242 err = ENAMETOOLONG; | |
| 243 | |
| 244 errno = err; | |
| 245 return err ? -1 : len; | |
| 246 } | |
| 247 #endif /* WIN32_ANY */ | |
| 248 } | |
| 446 | 249 |
| 771 | 250 /* Mule Note: This function works with and returns |
| 2526 | 251 internally-formatted strings. |
| 252 | |
| 253 if LINKS_ONLY is true, don't do case canonicalization under | |
| 254 Windows. */ | |
| 440 | 255 |
| 867 | 256 Ibyte * |
| 2526 | 257 qxe_realpath (const Ibyte *path, Ibyte *resolved_path, Boolint links_only) |
| 428 | 258 { |
| 2421 | 259 Ibyte copy_path[PATH_MAX_INTERNAL]; |
| 867 | 260 Ibyte *new_path = resolved_path; |
| 261 Ibyte *max_path; | |
| 2526 | 262 Ibyte *retval = NULL; |
| 1116 | 263 #if defined (HAVE_READLINK) || defined (WIN32_ANY) |
| 428 | 264 int readlinks = 0; |
| 2421 | 265 Ibyte link_path[PATH_MAX_INTERNAL]; |
| 428 | 266 int n; |
| 1116 | 267 int abslen = abs_start (path); |
| 428 | 268 #endif |
| 269 | |
| 2526 | 270 PROFILE_DECLARE (); |
| 271 | |
| 272 PROFILE_RECORD_ENTERING_SECTION (QSin_qxe_realpath); | |
| 273 | |
| 1760 | 274 restart: |
| 275 | |
| 428 | 276 /* Make a copy of the source path since we may need to modify it. */ |
| 771 | 277 qxestrcpy (copy_path, path); |
| 428 | 278 path = copy_path; |
| 2421 | 279 max_path = copy_path + PATH_MAX_INTERNAL - 2; |
| 446 | 280 |
| 819 | 281 if (0) |
| 282 ; | |
| 1116 | 283 #ifdef WIN32_ANY |
| 446 | 284 /* Check for c:/... or //server/... */ |
| 988 | 285 else if (abslen == 3 || abslen == 2) |
| 428 | 286 { |
| 462 | 287 /* Make sure drive letter is lowercased. */ |
| 1116 | 288 if (abslen == 3) |
| 289 { | |
| 290 *new_path = tolower (*path); | |
| 291 new_path++; | |
| 292 path++; | |
| 293 abslen--; | |
| 294 } | |
| 988 | 295 /* Coerce directory chars. */ |
| 1116 | 296 while (abslen-- > 0) |
| 297 { | |
| 298 if (IS_DIRECTORY_SEP (*path)) | |
| 299 *new_path++ = DIRECTORY_SEP; | |
| 300 else | |
| 301 *new_path++ = *path; | |
| 302 path++; | |
| 303 } | |
| 428 | 304 } |
| 819 | 305 #endif |
| 306 #ifdef WIN32_NATIVE | |
| 446 | 307 /* No drive letter, but a beginning slash? Prepend drive letter. */ |
| 308 else if (abslen == 1) | |
| 428 | 309 { |
| 2421 | 310 get_initial_directory (new_path, PATH_MAX_INTERNAL - 1); |
| 428 | 311 new_path += 3; |
| 312 path++; | |
| 313 } | |
| 446 | 314 /* Just a path name, prepend the current directory */ |
| 1116 | 315 else |
| 428 | 316 { |
| 2421 | 317 get_initial_directory (new_path, PATH_MAX_INTERNAL - 1); |
| 771 | 318 new_path += qxestrlen (new_path); |
| 446 | 319 if (!IS_DIRECTORY_SEP (new_path[-1])) |
| 320 *new_path++ = DIRECTORY_SEP; | |
| 428 | 321 } |
| 322 #else | |
| 771 | 323 /* If it's a relative pathname use get_initial_directory for starters. */ |
| 819 | 324 else if (abslen == 0) |
| 428 | 325 { |
| 2421 | 326 get_initial_directory (new_path, PATH_MAX_INTERNAL - 1); |
| 771 | 327 new_path += qxestrlen (new_path); |
| 446 | 328 if (!IS_DIRECTORY_SEP (new_path[-1])) |
| 329 *new_path++ = DIRECTORY_SEP; | |
| 428 | 330 } |
| 331 else | |
| 332 { | |
| 446 | 333 /* Copy first directory sep. May have two on cygwin. */ |
| 771 | 334 qxestrncpy (new_path, path, abslen); |
| 446 | 335 new_path += abslen; |
| 336 path += abslen; | |
| 428 | 337 } |
| 338 #endif | |
| 339 /* Expand each slash-separated pathname component. */ | |
| 340 while (*path != '\0') | |
| 341 { | |
| 342 /* Ignore stray "/". */ | |
| 446 | 343 if (IS_DIRECTORY_SEP (*path)) |
| 428 | 344 { |
| 345 path++; | |
| 346 continue; | |
| 347 } | |
| 348 | |
| 349 if (*path == '.') | |
| 350 { | |
| 351 /* Ignore ".". */ | |
| 446 | 352 if (path[1] == '\0' || IS_DIRECTORY_SEP (path[1])) |
| 428 | 353 { |
| 354 path++; | |
| 355 continue; | |
| 356 } | |
| 357 | |
| 442 | 358 /* Handle ".." */ |
| 359 if (path[1] == '.' && | |
| 446 | 360 (path[2] == '\0' || IS_DIRECTORY_SEP (path[2]))) |
| 428 | 361 { |
| 442 | 362 path += 2; |
| 428 | 363 |
| 442 | 364 /* Ignore ".." at root. */ |
| 1116 | 365 if (new_path == resolved_path + abs_start (resolved_path)) |
| 442 | 366 continue; |
| 428 | 367 |
| 442 | 368 /* Handle ".." by backing up. */ |
| 446 | 369 --new_path; |
| 370 while (!IS_DIRECTORY_SEP (new_path[-1])) | |
| 371 --new_path; | |
| 442 | 372 continue; |
| 428 | 373 } |
| 374 } | |
| 375 | |
| 376 /* Safely copy the next pathname component. */ | |
| 446 | 377 while (*path != '\0' && !IS_DIRECTORY_SEP (*path)) |
| 428 | 378 { |
| 379 if (path > max_path) | |
| 380 { | |
| 381 errno = ENAMETOOLONG; | |
| 2526 | 382 goto done; |
| 428 | 383 } |
| 384 *new_path++ = *path++; | |
| 385 } | |
| 386 | |
| 1116 | 387 #if defined (HAVE_READLINK) || defined (WIN32_ANY) |
| 771 | 388 /* See if latest pathname component is a symlink or needs case |
| 389 correction. */ | |
| 428 | 390 *new_path = '\0'; |
| 2526 | 391 n = readlink_or_correct_case (resolved_path, link_path, |
| 392 PATH_MAX_INTERNAL - 1, links_only); | |
| 428 | 393 |
| 394 if (n < 0) | |
| 395 { | |
| 771 | 396 /* EINVAL means the file exists but isn't a symlink or doesn't |
| 397 need case correction. */ | |
| 1116 | 398 #ifdef WIN32_ANY |
| 462 | 399 if (errno != EINVAL && errno != ENOENT) |
| 400 #else | |
| 401 if (errno != EINVAL) | |
| 402 #endif | |
| 2526 | 403 goto done; |
| 428 | 404 } |
| 405 else | |
| 406 { | |
| 407 /* Protect against infinite loops. */ | |
| 408 if (readlinks++ > MAX_READLINKS) | |
| 409 { | |
| 410 errno = ELOOP; | |
| 2526 | 411 goto done; |
| 428 | 412 } |
| 413 | |
| 414 /* Note: readlink doesn't add the null byte. */ | |
| 415 link_path[n] = '\0'; | |
| 446 | 416 |
| 1760 | 417 abslen = abs_start (link_path); |
| 418 if (abslen > 0) | |
| 419 { | |
| 420 /* Start over for an absolute symlink. */ | |
| 421 new_path = resolved_path; | |
| 422 qxestrcat (link_path, path); | |
| 423 path = link_path; | |
| 424 goto restart; | |
| 425 } | |
| 426 | |
| 427 /* Otherwise back up over this component. */ | |
| 428 for (--new_path; !IS_DIRECTORY_SEP (*new_path); --new_path) | |
| 429 assert (new_path > resolved_path); | |
| 428 | 430 |
| 431 /* Safe sex check. */ | |
| 2421 | 432 if (qxestrlen (path) + n >= PATH_MAX_INTERNAL) |
| 428 | 433 { |
| 434 errno = ENAMETOOLONG; | |
| 2526 | 435 goto done; |
| 428 | 436 } |
| 437 | |
| 438 /* Insert symlink contents into path. */ | |
| 771 | 439 qxestrcat (link_path, path); |
| 440 qxestrcpy (copy_path, link_path); | |
| 428 | 441 path = copy_path; |
| 442 } | |
| 1116 | 443 #endif /* HAVE_READLINK || WIN32_ANY */ |
| 446 | 444 *new_path++ = DIRECTORY_SEP; |
| 428 | 445 } |
| 446 | |
| 447 /* Delete trailing slash but don't whomp a lone slash. */ | |
| 1116 | 448 if (new_path != resolved_path + abs_start (resolved_path) && |
| 771 | 449 IS_DIRECTORY_SEP (new_path[-1])) |
| 428 | 450 new_path--; |
| 451 | |
| 452 /* Make sure it's null terminated. */ | |
| 453 *new_path = '\0'; | |
| 446 | 454 |
| 2526 | 455 retval = resolved_path; |
| 456 done: | |
| 457 PROFILE_RECORD_EXITING_SECTION (QSin_qxe_realpath); | |
| 458 return retval; | |
| 428 | 459 } |
| 2526 | 460 |
| 461 void | |
| 462 vars_of_realpath (void) | |
| 463 { | |
| 464 QSin_qxe_realpath = | |
|
4952
19a72041c5ed
Mule-izing, various fixes related to char * arguments
Ben Wing <ben@xemacs.org>
parents:
4834
diff
changeset
|
465 build_defer_string ("(in qxe_realpath)"); |
| 2526 | 466 staticpro (&QSin_qxe_realpath); |
| 467 } |