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* Copyright (c) 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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#include <sys/param.h>
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#endif /* STDC_HEADERS */
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#endif /* HAVE_STRING_H */
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#endif /* HAVE_STRINGS_H */
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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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#endif /* HAVE_UNISTD_H */
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# ifdef HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# ifdef HAVE_SYS_DIR_H
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(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
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(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
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size_t ptsize, upsize;
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* If no buffer specified by the user, allocate one as necessary.
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* If a buffer is specified, the size has to be non-zero. The path
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* is built from the end of the buffer backwards.
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if ((pt = malloc(ptsize = 1024 - 4)) == NULL)
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* Allocate bytes (1024 - malloc space) for the string of "../"'s.
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* Should always be enough (it's 340 levels). If it's not, allocate
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* as necessary. Special * case the first stat, it's ".", not "..".
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if ((up = malloc(upsize = 1024 - 4)) == NULL)
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/* Save root values, so know when to stop. */
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errno = 0; /* XXX readdir has no error return. */
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for (first = 1;; first = 0) {
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/* Stat the current level. */
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/* Save current node values. */
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/* Check for reaching root. */
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if (root_dev == dev && root_ino == ino) {
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* It's unclear that it's a requirement to copy the
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* path to the beginning of the buffer, but it's always
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* been that way and stuff would probably break.
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bcopy(bpt, pt, ept - bpt);
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* Build pointer to the parent directory, allocating memory
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* as necessary. Max length is 3 for "../", the largest
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* possible component name, plus a trailing NULL.
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if (bup + 3 + MAXNAMLEN + 1 >= eup) {
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if ((nup = realloc(up, upsize *= 2)) == NULL)
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/* Open and stat parent directory. */
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if (!(dir = opendir(up)) || fstat(dirfd(dir), &s))
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/* Add trailing slash for next directory. */
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* If it's a mount point, have to stat each element because
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* the inode number in the directory is for the entry in the
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* parent directory, not the inode number of the mounted file.
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if (s.st_dev == dev) {
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if (!(dp = readdir(dir)))
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if (dp->d_fileno == ino)
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if (!(dp = readdir(dir)))
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bcopy(dp->d_name, bup, NAMLEN(dp) + 1);
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/* Save the first error for later. */
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if (s.st_dev == dev && s.st_ino == ino)
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* Check for length of the current name, preceding slash,
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if (bpt - pt <= NAMLEN(dp) + (first ? 1 : 2)) {
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if ((npt = realloc(pt, ptsize *= 2)) == NULL)
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bcopy(bpt, ept - len, len);
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bcopy(dp->d_name, bpt, NAMLEN(dp));
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/* Truncate any file name. */
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* If readdir set errno, use it, not any saved error; otherwise,
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* didn't find the current directory in its parent directory, set
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errno = save_errno ? save_errno : ENOENT;