| 1 |
/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc. |
| 2 |
This file is part of the GNU C Library. |
| 3 |
|
| 4 |
The GNU C Library is free software; you can redistribute it and/or |
| 5 |
modify it under the terms of the GNU Lesser General Public |
| 6 |
License as published by the Free Software Foundation; either |
| 7 |
version 2.1 of the License, or (at your option) any later version. |
| 8 |
|
| 9 |
The GNU C Library is distributed in the hope that it will be useful, |
| 10 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 |
Lesser General Public License for more details. |
| 13 |
|
| 14 |
You should have received a copy of the GNU Lesser General Public |
| 15 |
License along with the GNU C Library; if not, write to the Free |
| 16 |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 |
02111-1307 USA. */ |
| 18 |
|
| 19 |
/* Wants: |
| 20 |
AC_STDC_HEADERS |
| 21 |
AC_DIR_HEADER |
| 22 |
AC_UNISTD_H |
| 23 |
AC_MEMORY_H |
| 24 |
AC_CONST |
| 25 |
AC_ALLOCA |
| 26 |
*/ |
| 27 |
|
| 28 |
/* |
| 29 |
* $Header$ |
| 30 |
*/ |
| 31 |
|
| 32 |
/* Modified: 26 July 2003; Martin Schlemmer <azarah@gentoo.org> |
| 33 |
* |
| 34 |
* Cleaned up unneeded stuff. Add a wrapper to try and detect when |
| 35 |
* we have a kernel whose getcwd system call do not handle directory |
| 36 |
* names longer than PATH_MAX, and if so, use our generic version. |
| 37 |
* To work truly with > PATH_MAX lengh CWDs, I had to increase the |
| 38 |
* size of the dots[] array. Also prepended a 'e' to functions that |
| 39 |
* I did not rip out. |
| 40 |
* |
| 41 |
*/ |
| 42 |
|
| 43 |
/* AIX requires this to be the first thing in the file. */ |
| 44 |
#if defined _AIX && !defined __GNUC__ |
| 45 |
#pragma alloca |
| 46 |
#endif |
| 47 |
|
| 48 |
#ifdef HAVE_CONFIG_H |
| 49 |
# include "config.h" |
| 50 |
#endif |
| 51 |
|
| 52 |
#include <errno.h> |
| 53 |
#include <sys/types.h> |
| 54 |
#include <sys/stat.h> |
| 55 |
|
| 56 |
#ifdef STDC_HEADERS |
| 57 |
# include <stddef.h> |
| 58 |
#endif |
| 59 |
|
| 60 |
#if !defined __GNU_LIBRARY__ && !defined STDC_HEADERS |
| 61 |
extern int errno; |
| 62 |
#endif |
| 63 |
#ifndef __set_errno |
| 64 |
# define __set_errno(val) errno = (val) |
| 65 |
#endif |
| 66 |
|
| 67 |
#ifndef NULL |
| 68 |
# define NULL 0 |
| 69 |
#endif |
| 70 |
|
| 71 |
#if defined USGr3 && !defined DIRENT |
| 72 |
# define DIRENT |
| 73 |
#endif /* USGr3 */ |
| 74 |
#if defined Xenix && !defined SYSNDIR |
| 75 |
# define SYSNDIR |
| 76 |
#endif /* Xenix */ |
| 77 |
|
| 78 |
#if defined POSIX || defined DIRENT || defined __GNU_LIBRARY__ |
| 79 |
# include <dirent.h> |
| 80 |
# ifndef __GNU_LIBRARY__ |
| 81 |
# define D_NAMLEN(d) strlen((d)->d_name) |
| 82 |
# else |
| 83 |
# define HAVE_D_NAMLEN |
| 84 |
# define D_NAMLEN(d) ((d)->d_namlen) |
| 85 |
# endif |
| 86 |
#else /* not POSIX or DIRENT */ |
| 87 |
# define dirent direct |
| 88 |
# define D_NAMLEN(d) ((d)->d_namlen) |
| 89 |
# define HAVE_D_NAMLEN |
| 90 |
# if defined USG && !defined sgi |
| 91 |
# if defined SYSNDIR |
| 92 |
# include <sys/ndir.h> |
| 93 |
# else /* Not SYSNDIR */ |
| 94 |
# include "ndir.h" |
| 95 |
# endif /* SYSNDIR */ |
| 96 |
# else /* not USG */ |
| 97 |
# include <sys/dir.h> |
| 98 |
# endif /* USG */ |
| 99 |
#endif /* POSIX or DIRENT or __GNU_LIBRARY__ */ |
| 100 |
|
| 101 |
#if defined HAVE_UNISTD_H || defined __GNU_LIBRARY__ |
| 102 |
# include <unistd.h> |
| 103 |
#endif |
| 104 |
|
| 105 |
#if defined STDC_HEADERS || defined __GNU_LIBRARY__ || defined POSIX |
| 106 |
# include <stdlib.h> |
| 107 |
# include <string.h> |
| 108 |
# define ANSI_STRING |
| 109 |
#else /* No standard headers. */ |
| 110 |
|
| 111 |
# ifdef USG |
| 112 |
|
| 113 |
# include <string.h> |
| 114 |
# ifdef NEED_MEMORY_H |
| 115 |
# include <memory.h> |
| 116 |
# endif |
| 117 |
# define ANSI_STRING |
| 118 |
|
| 119 |
# else /* Not USG. */ |
| 120 |
|
| 121 |
# ifdef NeXT |
| 122 |
|
| 123 |
# include <string.h> |
| 124 |
|
| 125 |
# else /* Not NeXT. */ |
| 126 |
|
| 127 |
# include <strings.h> |
| 128 |
|
| 129 |
# ifndef bcmp |
| 130 |
extern int bcmp(); |
| 131 |
# endif |
| 132 |
# ifndef bzero |
| 133 |
extern void bzero(); |
| 134 |
# endif |
| 135 |
# ifndef bcopy |
| 136 |
extern void bcopy(); |
| 137 |
# endif |
| 138 |
|
| 139 |
# endif /* NeXT. */ |
| 140 |
|
| 141 |
# endif /* USG. */ |
| 142 |
|
| 143 |
extern char *malloc(), *realloc(); |
| 144 |
extern void free(); |
| 145 |
|
| 146 |
#endif /* Standard headers. */ |
| 147 |
|
| 148 |
#ifndef ANSI_STRING |
| 149 |
# define memcpy(d, s, n) bcopy((s), (d), (n)) |
| 150 |
# define memmove memcpy |
| 151 |
#endif /* Not ANSI_STRING. */ |
| 152 |
|
| 153 |
#ifndef MAX |
| 154 |
# define MAX(a, b) ((a) < (b) ? (b) : (a)) |
| 155 |
#endif |
| 156 |
|
| 157 |
#ifdef _LIBC |
| 158 |
# ifndef mempcpy |
| 159 |
# define mempcpy __mempcpy |
| 160 |
# endif |
| 161 |
# define HAVE_MEMPCPY 1 |
| 162 |
#endif |
| 163 |
|
| 164 |
#if !defined __alloca && !defined __GNU_LIBRARY__ |
| 165 |
|
| 166 |
# ifdef __GNUC__ |
| 167 |
# undef alloca |
| 168 |
# define alloca(n) __builtin_alloca (n) |
| 169 |
# else /* Not GCC. */ |
| 170 |
# if defined sparc || defined HAVE_ALLOCA_H |
| 171 |
# include <alloca.h> |
| 172 |
# else /* Not sparc or HAVE_ALLOCA_H. */ |
| 173 |
# ifndef _AIX |
| 174 |
extern char *alloca(); |
| 175 |
# endif /* Not _AIX. */ |
| 176 |
# endif /* sparc or HAVE_ALLOCA_H. */ |
| 177 |
# endif /* GCC. */ |
| 178 |
|
| 179 |
# define __alloca alloca |
| 180 |
|
| 181 |
#endif |
| 182 |
|
| 183 |
#if defined HAVE_LIMITS_H || defined STDC_HEADERS || defined __GNU_LIBRARY__ |
| 184 |
# include <limits.h> |
| 185 |
#else |
| 186 |
# include <sys/param.h> |
| 187 |
#endif |
| 188 |
|
| 189 |
#ifndef PATH_MAX |
| 190 |
# ifdef MAXPATHLEN |
| 191 |
# define PATH_MAX MAXPATHLEN |
| 192 |
# else |
| 193 |
# define PATH_MAX 1024 |
| 194 |
# endif |
| 195 |
#endif |
| 196 |
|
| 197 |
#if !defined STDC_HEADERS && !defined __GNU_LIBRARY__ |
| 198 |
# undef size_t |
| 199 |
# define size_t unsigned int |
| 200 |
#endif |
| 201 |
|
| 202 |
#if !__STDC__ && !defined const |
| 203 |
# define const |
| 204 |
#endif |
| 205 |
|
| 206 |
#ifndef __GNU_LIBRARY__ |
| 207 |
# define __lstat stat |
| 208 |
#endif |
| 209 |
|
| 210 |
#ifndef _LIBC |
| 211 |
# define __getcwd getcwd |
| 212 |
#endif |
| 213 |
|
| 214 |
#ifndef GETCWD_RETURN_TYPE |
| 215 |
# define GETCWD_RETURN_TYPE char * |
| 216 |
#endif |
| 217 |
|
| 218 |
#ifndef SB_PATH_MAX |
| 219 |
# include "localdecls.h" |
| 220 |
# define OUTSIDE_LIBSANDBOX |
| 221 |
#endif |
| 222 |
|
| 223 |
#ifndef __LIBC |
| 224 |
# define __lstat lstat |
| 225 |
# define __readdir readdir |
| 226 |
# define __closedir closedir |
| 227 |
#endif |
| 228 |
|
| 229 |
/* Get the pathname of the current working directory, and put it in SIZE |
| 230 |
bytes of BUF. Returns NULL if the directory couldn't be determined or |
| 231 |
SIZE was too small. If successful, returns BUF. In GNU, if BUF is |
| 232 |
NULL, an array is allocated with `malloc'; the array is SIZE bytes long, |
| 233 |
unless SIZE == 0, in which case it is as big as necessary. */ |
| 234 |
|
| 235 |
GETCWD_RETURN_TYPE |
| 236 |
__egetcwd(buf, size) |
| 237 |
char *buf; |
| 238 |
size_t size; |
| 239 |
{ |
| 240 |
static const char dots[] |
| 241 |
= "../../../../../../../../../../../../../../../../../../../../../../../\ |
| 242 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 243 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 244 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
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../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 246 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 247 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 248 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 249 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 250 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 251 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 252 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 253 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 254 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 255 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 256 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 257 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 258 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 259 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 260 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 261 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 262 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 263 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 264 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 265 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 266 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 267 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 268 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 269 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 270 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 271 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 272 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 273 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 274 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 275 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 276 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 277 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 278 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 279 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 280 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 281 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\ |
| 282 |
../../../../../../../../../../../../../../../../../../../../../../../../../.."; |
| 283 |
const char *dotp = &dots[sizeof (dots)]; |
| 284 |
const char *dotlist = dots; |
| 285 |
size_t dotsize = sizeof (dots) - 1; |
| 286 |
dev_t rootdev, thisdev; |
| 287 |
ino_t rootino, thisino; |
| 288 |
char *path; |
| 289 |
register char *pathp; |
| 290 |
struct stat st; |
| 291 |
int prev_errno = errno; |
| 292 |
size_t allocated = size; |
| 293 |
|
| 294 |
if (size == 0) { |
| 295 |
if (buf != NULL) { |
| 296 |
__set_errno(EINVAL); |
| 297 |
return NULL; |
| 298 |
} |
| 299 |
|
| 300 |
allocated = SB_PATH_MAX + 1; |
| 301 |
} |
| 302 |
|
| 303 |
if (buf != NULL) |
| 304 |
path = buf; |
| 305 |
else { |
| 306 |
path = malloc(allocated); |
| 307 |
if (path == NULL) |
| 308 |
return NULL; |
| 309 |
} |
| 310 |
|
| 311 |
pathp = path + allocated; |
| 312 |
*--pathp = '\0'; |
| 313 |
|
| 314 |
if (__lstat(".", &st) < 0) |
| 315 |
goto lose2; |
| 316 |
thisdev = st.st_dev; |
| 317 |
thisino = st.st_ino; |
| 318 |
|
| 319 |
if (__lstat("/", &st) < 0) |
| 320 |
goto lose2; |
| 321 |
rootdev = st.st_dev; |
| 322 |
rootino = st.st_ino; |
| 323 |
|
| 324 |
while (!(thisdev == rootdev && thisino == rootino)) { |
| 325 |
register DIR *dirstream; |
| 326 |
struct dirent *d; |
| 327 |
dev_t dotdev; |
| 328 |
ino_t dotino; |
| 329 |
char mount_point; |
| 330 |
|
| 331 |
/* Look at the parent directory. */ |
| 332 |
if (dotp == dotlist) { |
| 333 |
/* My, what a deep directory tree you have, Grandma. */ |
| 334 |
char *new; |
| 335 |
if (dotlist == dots) { |
| 336 |
new = malloc(dotsize * 2 + 1); |
| 337 |
if (new == NULL) |
| 338 |
goto lose; |
| 339 |
#ifdef HAVE_MEMPCPY |
| 340 |
dotp = mempcpy(new, dots, dotsize); |
| 341 |
#else |
| 342 |
memcpy(new, dots, dotsize); |
| 343 |
dotp = &new[dotsize]; |
| 344 |
#endif |
| 345 |
} else { |
| 346 |
new = realloc((__ptr_t) dotlist, dotsize * 2 + 1); |
| 347 |
if (new == NULL) |
| 348 |
goto lose; |
| 349 |
dotp = &new[dotsize]; |
| 350 |
} |
| 351 |
#ifdef HAVE_MEMPCPY |
| 352 |
*((char *) mempcpy((char *) dotp, new, dotsize)) = '\0'; |
| 353 |
dotsize *= 2; |
| 354 |
#else |
| 355 |
memcpy((char *) dotp, new, dotsize); |
| 356 |
dotsize *= 2; |
| 357 |
new[dotsize] = '\0'; |
| 358 |
#endif |
| 359 |
dotlist = new; |
| 360 |
} |
| 361 |
|
| 362 |
dotp -= 3; |
| 363 |
|
| 364 |
/* Figure out if this directory is a mount point. */ |
| 365 |
if (__lstat(dotp, &st) < 0) |
| 366 |
goto lose; |
| 367 |
dotdev = st.st_dev; |
| 368 |
dotino = st.st_ino; |
| 369 |
mount_point = dotdev != thisdev; |
| 370 |
|
| 371 |
/* Search for the last directory. */ |
| 372 |
#ifdef OUTSIDE_LIBSANDBOX |
| 373 |
dirstream = opendir(dotp); |
| 374 |
#else |
| 375 |
dirstream = true_opendir(dotp); |
| 376 |
#endif |
| 377 |
if (dirstream == NULL) |
| 378 |
goto lose; |
| 379 |
/* Clear errno to distinguish EOF from error if readdir returns |
| 380 |
NULL. */ |
| 381 |
__set_errno(0); |
| 382 |
while ((d = __readdir(dirstream)) != NULL) { |
| 383 |
if (d->d_name[0] == '.' && |
| 384 |
(d->d_name[1] == '\0' |
| 385 |
|| (d->d_name[1] == '.' && d->d_name[2] == '\0'))) |
| 386 |
continue; |
| 387 |
if (mount_point || (ino_t) d->d_ino == thisino) { |
| 388 |
char name[dotlist + dotsize - dotp + 1 + _D_ALLOC_NAMLEN(d)]; |
| 389 |
#ifdef HAVE_MEMPCPY |
| 390 |
char *tmp = mempcpy(name, dotp, |
| 391 |
dotlist + dotsize - dotp); |
| 392 |
*tmp++ = '/'; |
| 393 |
strcpy(tmp, d->d_name); |
| 394 |
#else |
| 395 |
memcpy(name, dotp, dotlist + dotsize - dotp); |
| 396 |
name[dotlist + dotsize - dotp] = '/'; |
| 397 |
strcpy(&name[dotlist + dotsize - dotp + 1], d->d_name); |
| 398 |
#endif |
| 399 |
/* We don't fail here if we cannot stat() a directory entry. |
| 400 |
This can happen when (network) filesystems fail. If this |
| 401 |
entry is in fact the one we are looking for we will find |
| 402 |
out soon as we reach the end of the directory without |
| 403 |
having found anything. */ |
| 404 |
if (__lstat(name, &st) >= 0 && st.st_dev == thisdev |
| 405 |
&& st.st_ino == thisino) |
| 406 |
break; |
| 407 |
} |
| 408 |
} |
| 409 |
if (d == NULL) { |
| 410 |
int save = errno; |
| 411 |
(void) __closedir(dirstream); |
| 412 |
if (save == 0) |
| 413 |
/* EOF on dirstream, which means that the current directory |
| 414 |
has been removed. */ |
| 415 |
save = ENOENT; |
| 416 |
__set_errno(save); |
| 417 |
goto lose; |
| 418 |
} else { |
| 419 |
size_t namlen = _D_EXACT_NAMLEN(d); |
| 420 |
|
| 421 |
if ((size_t) (pathp - path) <= namlen) { |
| 422 |
if (size != 0) { |
| 423 |
(void) __closedir(dirstream); |
| 424 |
__set_errno(ERANGE); |
| 425 |
goto lose; |
| 426 |
} else { |
| 427 |
char *tmp; |
| 428 |
size_t oldsize = allocated; |
| 429 |
|
| 430 |
allocated = 2 * MAX(allocated, namlen); |
| 431 |
tmp = realloc(path, allocated); |
| 432 |
if (tmp == NULL) { |
| 433 |
(void) __closedir(dirstream); |
| 434 |
__set_errno(ENOMEM); /* closedir might have changed it. */ |
| 435 |
goto lose; |
| 436 |
} |
| 437 |
|
| 438 |
/* Move current contents up to the end of the buffer. |
| 439 |
This is guaranteed to be non-overlapping. */ |
| 440 |
pathp = |
| 441 |
memcpy(tmp + allocated - |
| 442 |
(path + oldsize - pathp), |
| 443 |
tmp + (pathp - path), path + oldsize - pathp); |
| 444 |
path = tmp; |
| 445 |
} |
| 446 |
} |
| 447 |
pathp -= namlen; |
| 448 |
(void) memcpy(pathp, d->d_name, namlen); |
| 449 |
*--pathp = '/'; |
| 450 |
(void) __closedir(dirstream); |
| 451 |
} |
| 452 |
|
| 453 |
thisdev = dotdev; |
| 454 |
thisino = dotino; |
| 455 |
} |
| 456 |
|
| 457 |
if (pathp == &path[allocated - 1]) |
| 458 |
*--pathp = '/'; |
| 459 |
|
| 460 |
if (dotlist != dots) |
| 461 |
free((__ptr_t) dotlist); |
| 462 |
|
| 463 |
memmove(path, pathp, path + allocated - pathp); |
| 464 |
|
| 465 |
/* Restore errno on successful return. */ |
| 466 |
__set_errno(prev_errno); |
| 467 |
|
| 468 |
return path; |
| 469 |
|
| 470 |
lose: |
| 471 |
if (dotlist != dots) |
| 472 |
free((__ptr_t) dotlist); |
| 473 |
lose2: |
| 474 |
if (buf == NULL) |
| 475 |
free(path); |
| 476 |
return NULL; |
| 477 |
} |
| 478 |
|
| 479 |
GETCWD_RETURN_TYPE |
| 480 |
egetcwd(buf, size) |
| 481 |
char *buf; |
| 482 |
size_t size; |
| 483 |
{ |
| 484 |
struct stat st; |
| 485 |
char *tmpbuf; |
| 486 |
|
| 487 |
__set_errno(0); |
| 488 |
tmpbuf = getcwd(buf, size); |
| 489 |
|
| 490 |
if (tmpbuf) { |
| 491 |
__lstat(buf, &st); |
| 492 |
} else { |
| 493 |
return tmpbuf; |
| 494 |
} |
| 495 |
|
| 496 |
if (errno) { |
| 497 |
/* If lstat() failed with eerror = ENOENT, then its |
| 498 |
* possible that we are running on an older kernel, |
| 499 |
* so use our generic version which *should* not fail. |
| 500 |
*/ |
| 501 |
if (errno == ENOENT) { |
| 502 |
return __egetcwd(buf, size); |
| 503 |
} else { |
| 504 |
return tmpbuf; |
| 505 |
} |
| 506 |
} |
| 507 |
|
| 508 |
return tmpbuf; |
| 509 |
} |
| 510 |
|
| 511 |
// vim:expandtab noai:cindent ai |
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