| 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 |
|
| 49 |
#include <errno.h>
|
| 50 |
#include <sys/types.h>
|
| 51 |
#include <sys/stat.h>
|
| 52 |
|
| 53 |
#ifdef STDC_HEADERS
|
| 54 |
# include <stddef.h>
|
| 55 |
#endif
|
| 56 |
|
| 57 |
#include "config.h"
|
| 58 |
#include <sys/param.h>
|
| 59 |
#include "localdecls.h"
|
| 60 |
|
| 61 |
|
| 62 |
#if !defined __GNU_LIBRARY__ && !defined STDC_HEADERS
|
| 63 |
extern int errno;
|
| 64 |
#endif
|
| 65 |
#ifndef __set_errno
|
| 66 |
# define __set_errno(val) errno = (val)
|
| 67 |
#endif
|
| 68 |
|
| 69 |
#ifndef NULL
|
| 70 |
# define NULL 0
|
| 71 |
#endif
|
| 72 |
|
| 73 |
#if defined USGr3 && !defined DIRENT
|
| 74 |
# define DIRENT
|
| 75 |
#endif /* USGr3 */
|
| 76 |
#if defined Xenix && !defined SYSNDIR
|
| 77 |
# define SYSNDIR
|
| 78 |
#endif /* Xenix */
|
| 79 |
|
| 80 |
#if defined POSIX || defined DIRENT || defined __GNU_LIBRARY__
|
| 81 |
# include <dirent.h>
|
| 82 |
# ifndef __GNU_LIBRARY__
|
| 83 |
# define D_NAMLEN(d) strlen((d)->d_name)
|
| 84 |
# else
|
| 85 |
# define HAVE_D_NAMLEN
|
| 86 |
# define D_NAMLEN(d) ((d)->d_namlen)
|
| 87 |
# endif
|
| 88 |
#else /* not POSIX or DIRENT */
|
| 89 |
# define dirent direct
|
| 90 |
# define D_NAMLEN(d) ((d)->d_namlen)
|
| 91 |
# define HAVE_D_NAMLEN
|
| 92 |
# if defined USG && !defined sgi
|
| 93 |
# if defined SYSNDIR
|
| 94 |
# include <sys/ndir.h>
|
| 95 |
# else /* Not SYSNDIR */
|
| 96 |
# include "ndir.h"
|
| 97 |
# endif /* SYSNDIR */
|
| 98 |
# else /* not USG */
|
| 99 |
# include <sys/dir.h>
|
| 100 |
# endif /* USG */
|
| 101 |
#endif /* POSIX or DIRENT or __GNU_LIBRARY__ */
|
| 102 |
|
| 103 |
#if defined HAVE_UNISTD_H || defined __GNU_LIBRARY__
|
| 104 |
# include <unistd.h>
|
| 105 |
#endif
|
| 106 |
|
| 107 |
#if defined STDC_HEADERS || defined __GNU_LIBRARY__ || defined POSIX
|
| 108 |
# include <stdlib.h>
|
| 109 |
# include <string.h>
|
| 110 |
# define ANSI_STRING
|
| 111 |
#else /* No standard headers. */
|
| 112 |
|
| 113 |
# ifdef USG
|
| 114 |
|
| 115 |
# include <string.h>
|
| 116 |
# ifdef NEED_MEMORY_H
|
| 117 |
# include <memory.h>
|
| 118 |
# endif
|
| 119 |
# define ANSI_STRING
|
| 120 |
|
| 121 |
# else /* Not USG. */
|
| 122 |
|
| 123 |
# ifdef NeXT
|
| 124 |
|
| 125 |
# include <string.h>
|
| 126 |
|
| 127 |
# else /* Not NeXT. */
|
| 128 |
|
| 129 |
# include <strings.h>
|
| 130 |
|
| 131 |
# ifndef bcmp
|
| 132 |
extern int bcmp();
|
| 133 |
# endif
|
| 134 |
# ifndef bzero
|
| 135 |
extern void bzero();
|
| 136 |
# endif
|
| 137 |
# ifndef bcopy
|
| 138 |
extern void bcopy();
|
| 139 |
# endif
|
| 140 |
|
| 141 |
# endif /* NeXT. */
|
| 142 |
|
| 143 |
# endif /* USG. */
|
| 144 |
|
| 145 |
extern char *malloc(), *realloc();
|
| 146 |
extern void free();
|
| 147 |
|
| 148 |
#endif /* Standard headers. */
|
| 149 |
|
| 150 |
#ifndef ANSI_STRING
|
| 151 |
# define memcpy(d, s, n) bcopy((s), (d), (n))
|
| 152 |
# define memmove memcpy
|
| 153 |
#endif /* Not ANSI_STRING. */
|
| 154 |
|
| 155 |
#ifndef MAX
|
| 156 |
# define MAX(a, b) ((a) < (b) ? (b) : (a))
|
| 157 |
#endif
|
| 158 |
|
| 159 |
#ifdef _LIBC
|
| 160 |
# ifndef mempcpy
|
| 161 |
# define mempcpy __mempcpy
|
| 162 |
# endif
|
| 163 |
# define HAVE_MEMPCPY 1
|
| 164 |
#endif
|
| 165 |
|
| 166 |
#if !defined __alloca && !defined __GNU_LIBRARY__
|
| 167 |
|
| 168 |
# ifdef __GNUC__
|
| 169 |
# undef alloca
|
| 170 |
# define alloca(n) __builtin_alloca (n)
|
| 171 |
# else /* Not GCC. */
|
| 172 |
# if defined sparc || defined HAVE_ALLOCA_H
|
| 173 |
# include <alloca.h>
|
| 174 |
# else /* Not sparc or HAVE_ALLOCA_H. */
|
| 175 |
# ifndef _AIX
|
| 176 |
extern char *alloca();
|
| 177 |
# endif /* Not _AIX. */
|
| 178 |
# endif /* sparc or HAVE_ALLOCA_H. */
|
| 179 |
# endif /* GCC. */
|
| 180 |
|
| 181 |
# define __alloca alloca
|
| 182 |
|
| 183 |
#endif
|
| 184 |
|
| 185 |
#if defined HAVE_LIMITS_H || defined STDC_HEADERS || defined __GNU_LIBRARY__
|
| 186 |
# include <limits.h>
|
| 187 |
#else
|
| 188 |
# include <sys/param.h>
|
| 189 |
#endif
|
| 190 |
|
| 191 |
#ifndef PATH_MAX
|
| 192 |
# ifdef MAXPATHLEN
|
| 193 |
# define PATH_MAX MAXPATHLEN
|
| 194 |
# else
|
| 195 |
# define PATH_MAX 1024
|
| 196 |
# endif
|
| 197 |
#endif
|
| 198 |
|
| 199 |
#if !defined STDC_HEADERS && !defined __GNU_LIBRARY__
|
| 200 |
# undef size_t
|
| 201 |
# define size_t unsigned int
|
| 202 |
#endif
|
| 203 |
|
| 204 |
#if !__STDC__ && !defined const
|
| 205 |
# define const
|
| 206 |
#endif
|
| 207 |
|
| 208 |
#ifndef __GNU_LIBRARY__
|
| 209 |
# define __lstat stat
|
| 210 |
#endif
|
| 211 |
|
| 212 |
#ifndef _LIBC
|
| 213 |
# define __getcwd getcwd
|
| 214 |
#endif
|
| 215 |
|
| 216 |
#ifndef GETCWD_RETURN_TYPE
|
| 217 |
# define GETCWD_RETURN_TYPE char *
|
| 218 |
#endif
|
| 219 |
|
| 220 |
#ifndef __LIBC
|
| 221 |
# define __lstat lstat
|
| 222 |
# define __readdir readdir
|
| 223 |
# define __closedir closedir
|
| 224 |
#endif
|
| 225 |
|
| 226 |
/* Get the pathname of the current working directory, and put it in SIZE
|
| 227 |
bytes of BUF. Returns NULL if the directory couldn't be determined or
|
| 228 |
SIZE was too small. If successful, returns BUF. In GNU, if BUF is
|
| 229 |
NULL, an array is allocated with `malloc'; the array is SIZE bytes long,
|
| 230 |
unless SIZE == 0, in which case it is as big as necessary. */
|
| 231 |
|
| 232 |
SB_STATIC GETCWD_RETURN_TYPE
|
| 233 |
__egetcwd(buf, size)
|
| 234 |
char *buf;
|
| 235 |
size_t size;
|
| 236 |
{
|
| 237 |
static const char dots[]
|
| 238 |
= "../../../../../../../../../../../../../../../../../../../../../../../\
|
| 239 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 240 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 241 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 242 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 243 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 244 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 245 |
../../../../../../../../../../../../../../../../../../../../../../../../../../\
|
| 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 |
const char *dotp = &dots[sizeof (dots)];
|
| 281 |
const char *dotlist = dots;
|
| 282 |
size_t dotsize = sizeof (dots) - 1;
|
| 283 |
dev_t rootdev, thisdev;
|
| 284 |
ino_t rootino, thisino;
|
| 285 |
char *path;
|
| 286 |
register char *pathp;
|
| 287 |
struct stat st;
|
| 288 |
int prev_errno = errno;
|
| 289 |
size_t allocated = size;
|
| 290 |
|
| 291 |
if (size == 0) {
|
| 292 |
if (buf != NULL) {
|
| 293 |
__set_errno(EINVAL);
|
| 294 |
return NULL;
|
| 295 |
}
|
| 296 |
|
| 297 |
allocated = SB_PATH_MAX + 1;
|
| 298 |
}
|
| 299 |
|
| 300 |
if (buf != NULL)
|
| 301 |
path = buf;
|
| 302 |
else {
|
| 303 |
path = malloc(allocated);
|
| 304 |
if (path == NULL)
|
| 305 |
return NULL;
|
| 306 |
}
|
| 307 |
|
| 308 |
pathp = path + allocated;
|
| 309 |
*--pathp = '\0';
|
| 310 |
|
| 311 |
if (__lstat(".", &st) < 0)
|
| 312 |
goto lose2;
|
| 313 |
thisdev = st.st_dev;
|
| 314 |
thisino = st.st_ino;
|
| 315 |
|
| 316 |
if (__lstat("/", &st) < 0)
|
| 317 |
goto lose2;
|
| 318 |
rootdev = st.st_dev;
|
| 319 |
rootino = st.st_ino;
|
| 320 |
|
| 321 |
while (!(thisdev == rootdev && thisino == rootino)) {
|
| 322 |
register DIR *dirstream;
|
| 323 |
struct dirent *d;
|
| 324 |
dev_t dotdev;
|
| 325 |
ino_t dotino;
|
| 326 |
char mount_point;
|
| 327 |
|
| 328 |
/* Look at the parent directory. */
|
| 329 |
if (dotp == dotlist) {
|
| 330 |
/* My, what a deep directory tree you have, Grandma. */
|
| 331 |
char *new;
|
| 332 |
if (dotlist == dots) {
|
| 333 |
new = malloc(dotsize * 2 + 1);
|
| 334 |
if (new == NULL)
|
| 335 |
goto lose;
|
| 336 |
#ifdef HAVE_MEMPCPY
|
| 337 |
dotp = (char *)mempcpy(new, dots, dotsize);
|
| 338 |
#else
|
| 339 |
memcpy(new, dots, dotsize);
|
| 340 |
dotp = &new[dotsize];
|
| 341 |
#endif
|
| 342 |
} else {
|
| 343 |
new = realloc((__ptr_t) dotlist, dotsize * 2 + 1);
|
| 344 |
if (new == NULL)
|
| 345 |
goto lose;
|
| 346 |
dotp = &new[dotsize];
|
| 347 |
}
|
| 348 |
#ifdef HAVE_MEMPCPY
|
| 349 |
*((char *) mempcpy((char *) dotp, new, dotsize)) = '\0';
|
| 350 |
dotsize *= 2;
|
| 351 |
#else
|
| 352 |
memcpy((char *) dotp, new, dotsize);
|
| 353 |
dotsize *= 2;
|
| 354 |
new[dotsize] = '\0';
|
| 355 |
#endif
|
| 356 |
dotlist = new;
|
| 357 |
}
|
| 358 |
|
| 359 |
dotp -= 3;
|
| 360 |
|
| 361 |
/* Figure out if this directory is a mount point. */
|
| 362 |
if (__lstat(dotp, &st) < 0)
|
| 363 |
goto lose;
|
| 364 |
dotdev = st.st_dev;
|
| 365 |
dotino = st.st_ino;
|
| 366 |
mount_point = dotdev != thisdev;
|
| 367 |
|
| 368 |
/* Search for the last directory. */
|
| 369 |
#ifdef OUTSIDE_LIBSANDBOX
|
| 370 |
dirstream = opendir(dotp);
|
| 371 |
#else
|
| 372 |
dirstream = true_opendir(dotp);
|
| 373 |
#endif
|
| 374 |
if (dirstream == NULL)
|
| 375 |
goto lose;
|
| 376 |
/* Clear errno to distinguish EOF from error if readdir returns
|
| 377 |
NULL. */
|
| 378 |
__set_errno(0);
|
| 379 |
while ((d = __readdir(dirstream)) != NULL) {
|
| 380 |
if (d->d_name[0] == '.' &&
|
| 381 |
(d->d_name[1] == '\0'
|
| 382 |
|| (d->d_name[1] == '.' && d->d_name[2] == '\0')))
|
| 383 |
continue;
|
| 384 |
if (mount_point || (ino_t) d->d_ino == thisino) {
|
| 385 |
char name[dotlist + dotsize - dotp + 1 + _D_ALLOC_NAMLEN(d)];
|
| 386 |
#ifdef HAVE_MEMPCPY
|
| 387 |
char *tmp = mempcpy(name, dotp,
|
| 388 |
dotlist + dotsize - dotp);
|
| 389 |
*tmp++ = '/';
|
| 390 |
strcpy(tmp, d->d_name);
|
| 391 |
#else
|
| 392 |
memcpy(name, dotp, dotlist + dotsize - dotp);
|
| 393 |
name[dotlist + dotsize - dotp] = '/';
|
| 394 |
strcpy(&name[dotlist + dotsize - dotp + 1], d->d_name);
|
| 395 |
#endif
|
| 396 |
/* We don't fail here if we cannot stat() a directory entry.
|
| 397 |
This can happen when (network) filesystems fail. If this
|
| 398 |
entry is in fact the one we are looking for we will find
|
| 399 |
out soon as we reach the end of the directory without
|
| 400 |
having found anything. */
|
| 401 |
if (__lstat(name, &st) >= 0 && st.st_dev == thisdev
|
| 402 |
&& st.st_ino == thisino)
|
| 403 |
break;
|
| 404 |
}
|
| 405 |
}
|
| 406 |
if (d == NULL) {
|
| 407 |
int save = errno;
|
| 408 |
(void) __closedir(dirstream);
|
| 409 |
if (save == 0)
|
| 410 |
/* EOF on dirstream, which means that the current directory
|
| 411 |
has been removed. */
|
| 412 |
save = ENOENT;
|
| 413 |
__set_errno(save);
|
| 414 |
goto lose;
|
| 415 |
} else {
|
| 416 |
size_t namlen = _D_EXACT_NAMLEN(d);
|
| 417 |
|
| 418 |
if ((size_t) (pathp - path) <= namlen) {
|
| 419 |
if (size != 0) {
|
| 420 |
(void) __closedir(dirstream);
|
| 421 |
__set_errno(ERANGE);
|
| 422 |
goto lose;
|
| 423 |
} else {
|
| 424 |
char *tmp;
|
| 425 |
size_t oldsize = allocated;
|
| 426 |
|
| 427 |
allocated = 2 * MAX(allocated, namlen);
|
| 428 |
tmp = realloc(path, allocated);
|
| 429 |
if (tmp == NULL) {
|
| 430 |
(void) __closedir(dirstream);
|
| 431 |
__set_errno(ENOMEM); /* closedir might have changed it. */
|
| 432 |
goto lose;
|
| 433 |
}
|
| 434 |
|
| 435 |
/* Move current contents up to the end of the buffer.
|
| 436 |
This is guaranteed to be non-overlapping. */
|
| 437 |
pathp = memcpy(tmp + allocated -
|
| 438 |
(path + oldsize - pathp),
|
| 439 |
tmp + (pathp - path), path + oldsize - pathp);
|
| 440 |
path = tmp;
|
| 441 |
}
|
| 442 |
}
|
| 443 |
pathp -= namlen;
|
| 444 |
(void) memcpy(pathp, d->d_name, namlen);
|
| 445 |
*--pathp = '/';
|
| 446 |
(void) __closedir(dirstream);
|
| 447 |
}
|
| 448 |
|
| 449 |
thisdev = dotdev;
|
| 450 |
thisino = dotino;
|
| 451 |
}
|
| 452 |
|
| 453 |
if (pathp == &path[allocated - 1])
|
| 454 |
*--pathp = '/';
|
| 455 |
|
| 456 |
if (dotlist != dots)
|
| 457 |
free((__ptr_t) dotlist);
|
| 458 |
|
| 459 |
memmove(path, pathp, path + allocated - pathp);
|
| 460 |
|
| 461 |
/* Restore errno on successful return. */
|
| 462 |
__set_errno(prev_errno);
|
| 463 |
|
| 464 |
return path;
|
| 465 |
|
| 466 |
lose:
|
| 467 |
if (dotlist != dots)
|
| 468 |
free((__ptr_t) dotlist);
|
| 469 |
lose2:
|
| 470 |
if (buf == NULL)
|
| 471 |
free(path);
|
| 472 |
return NULL;
|
| 473 |
}
|
| 474 |
|
| 475 |
SB_STATIC GETCWD_RETURN_TYPE
|
| 476 |
egetcwd(buf, size)
|
| 477 |
char *buf;
|
| 478 |
size_t size;
|
| 479 |
{
|
| 480 |
struct stat st;
|
| 481 |
char *tmpbuf;
|
| 482 |
|
| 483 |
__set_errno(0);
|
| 484 |
tmpbuf = getcwd(buf, size);
|
| 485 |
|
| 486 |
if (tmpbuf) {
|
| 487 |
__lstat(buf, &st);
|
| 488 |
} else {
|
| 489 |
return tmpbuf;
|
| 490 |
}
|
| 491 |
|
| 492 |
if (errno) {
|
| 493 |
/* If lstat() failed with eerror = ENOENT, then its
|
| 494 |
* possible that we are running on an older kernel,
|
| 495 |
* so use our generic version which *should* not fail.
|
| 496 |
*/
|
| 497 |
if (errno == ENOENT) {
|
| 498 |
return __egetcwd(buf, size);
|
| 499 |
} else {
|
| 500 |
return tmpbuf;
|
| 501 |
}
|
| 502 |
}
|
| 503 |
|
| 504 |
return tmpbuf;
|
| 505 |
}
|
| 506 |
|
| 507 |
// vim:noexpandtab noai:cindent ai
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