2017-01-31 12:33:47 +00:00
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/* $OpenBSD: getcwd.c,v 1.14 2005/08/08 08:05:34 espie Exp */
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2002-06-27 22:31:32 +00:00
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/*
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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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*
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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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* are met:
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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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2004-01-07 11:10:17 +00:00
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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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2002-06-27 22:31:32 +00:00
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*
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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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* SUCH DAMAGE.
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*/
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2006-03-22 19:46:12 +00:00
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/* OPENBSD ORIGINAL: lib/libc/gen/getcwd.c */
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2002-10-29 09:43:00 +00:00
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#include "includes.h"
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2002-06-27 22:31:32 +00:00
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#if !defined(HAVE_GETCWD)
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#include <sys/stat.h>
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#include <errno.h>
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#include <dirent.h>
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#include <sys/dir.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "includes.h"
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#define ISDOT(dp) \
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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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char *
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2004-01-07 11:10:17 +00:00
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getcwd(char *pt, size_t size)
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2002-06-27 22:31:32 +00:00
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{
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2006-03-22 19:46:12 +00:00
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struct dirent *dp;
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DIR *dir = NULL;
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dev_t dev;
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ino_t ino;
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int first;
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char *bpt, *bup;
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2002-06-27 22:31:32 +00:00
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struct stat s;
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dev_t root_dev;
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ino_t root_ino;
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size_t ptsize, upsize;
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int save_errno;
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char *ept, *eup, *up;
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/*
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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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*/
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if (pt) {
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ptsize = 0;
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2022-10-04 15:10:40 +00:00
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if (size == 0) {
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2002-06-27 22:31:32 +00:00
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errno = EINVAL;
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return (NULL);
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2022-10-04 15:10:40 +00:00
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} else if (size == 1) {
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errno = ERANGE;
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return (NULL);
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2002-06-27 22:31:32 +00:00
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}
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ept = pt + size;
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} else {
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2006-03-22 19:46:12 +00:00
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if ((pt = malloc(ptsize = MAXPATHLEN)) == NULL)
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2002-06-27 22:31:32 +00:00
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return (NULL);
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ept = pt + ptsize;
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}
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bpt = ept - 1;
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*bpt = '\0';
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/*
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2006-03-22 19:46:12 +00:00
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* Allocate bytes for the string of "../"'s.
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2002-06-27 22:31:32 +00:00
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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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*/
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2006-03-22 19:46:12 +00:00
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if ((up = malloc(upsize = MAXPATHLEN)) == NULL)
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2002-06-27 22:31:32 +00:00
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goto err;
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2006-03-22 19:46:12 +00:00
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eup = up + upsize;
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2002-06-27 22:31:32 +00:00
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bup = up;
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up[0] = '.';
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up[1] = '\0';
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/* Save root values, so know when to stop. */
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if (stat("/", &s))
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goto err;
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root_dev = s.st_dev;
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root_ino = s.st_ino;
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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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if (lstat(up, &s))
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goto err;
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/* Save current node values. */
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ino = s.st_ino;
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dev = s.st_dev;
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/* Check for reaching root. */
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if (root_dev == dev && root_ino == ino) {
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*--bpt = '/';
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/*
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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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*/
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memmove(pt, bpt, ept - bpt);
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free(up);
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return (pt);
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}
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/*
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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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2003-04-23 16:53:02 +00:00
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* possible component name, plus a trailing NUL.
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2002-06-27 22:31:32 +00:00
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*/
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if (bup + 3 + MAXNAMLEN + 1 >= eup) {
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char *nup;
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if ((nup = realloc(up, upsize *= 2)) == NULL)
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goto err;
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2006-03-22 19:46:12 +00:00
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bup = nup + (bup - up);
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2002-06-27 22:31:32 +00:00
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up = nup;
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eup = up + upsize;
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}
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*bup++ = '.';
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*bup++ = '.';
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*bup = '\0';
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2006-03-22 19:46:12 +00:00
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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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2002-06-27 22:31:32 +00:00
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goto err;
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/* Add trailing slash for next directory. */
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*bup++ = '/';
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/*
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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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*/
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save_errno = 0;
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if (s.st_dev == dev) {
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for (;;) {
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if (!(dp = readdir(dir)))
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goto notfound;
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if (dp->d_fileno == ino)
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break;
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}
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} else
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for (;;) {
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if (!(dp = readdir(dir)))
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goto notfound;
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if (ISDOT(dp))
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continue;
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2006-03-22 19:46:12 +00:00
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memcpy(bup, dp->d_name, dp->d_namlen + 1);
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2002-06-27 22:31:32 +00:00
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/* Save the first error for later. */
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if (lstat(up, &s)) {
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if (!save_errno)
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save_errno = errno;
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errno = 0;
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continue;
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}
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if (s.st_dev == dev && s.st_ino == ino)
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break;
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}
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/*
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* Check for length of the current name, preceding slash,
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* leading slash.
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*/
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if (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
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2006-03-22 19:46:12 +00:00
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size_t len;
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2002-06-27 22:31:32 +00:00
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char *npt;
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if (!ptsize) {
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errno = ERANGE;
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goto err;
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}
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len = ept - bpt;
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if ((npt = realloc(pt, ptsize *= 2)) == NULL)
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goto err;
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2006-03-22 19:46:12 +00:00
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bpt = npt + (bpt - pt);
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2002-06-27 22:31:32 +00:00
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pt = npt;
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ept = pt + ptsize;
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memmove(ept - len, bpt, len);
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bpt = ept - len;
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}
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if (!first)
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*--bpt = '/';
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bpt -= dp->d_namlen;
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2006-03-22 19:46:12 +00:00
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memcpy(bpt, dp->d_name, dp->d_namlen);
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2002-06-27 22:31:32 +00:00
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(void)closedir(dir);
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/* Truncate any file name. */
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*bup = '\0';
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}
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notfound:
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/*
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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 to ENOENT.
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*/
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if (!errno)
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errno = save_errno ? save_errno : ENOENT;
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/* FALLTHROUGH */
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err:
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2006-03-22 19:46:12 +00:00
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save_errno = errno;
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2002-06-27 22:31:32 +00:00
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if (ptsize)
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free(pt);
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2006-03-22 19:46:12 +00:00
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free(up);
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2002-06-27 22:31:32 +00:00
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if (dir)
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(void)closedir(dir);
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2006-03-22 19:46:12 +00:00
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errno = save_errno;
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2002-06-27 22:31:32 +00:00
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return (NULL);
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}
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#endif /* !defined(HAVE_GETCWD) */
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