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