+++ /dev/null
-/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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 <sys/param.h>
-#include <sys/stat.h>
-
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-static char *getcwd_physical __P((char *, size_t));
-
-#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;
-{
- char *pwd;
- size_t pwdlen;
- dev_t dev;
- ino_t ino;
- struct stat s;
-
- /* Check $PWD -- if it's right, it's fast. */
- if ((pwd = getenv("PWD")) != NULL && pwd[0] == '/' && stat(pwd, &s) != -1) {
- dev = s.st_dev;
- ino = s.st_ino;
- if (stat(".", &s) != -1 && dev == s.st_dev && ino == s.st_ino) {
- pwdlen = strlen(pwd);
- if (pt) {
- if (!size) {
- errno = EINVAL;
- return (NULL);
- }
- if (pwdlen + 1 > size) {
- errno = ERANGE;
- return (NULL);
- }
- } else if ((pt = malloc(pwdlen + 1)) == NULL) {
- errno = ENOMEM;
- return (NULL);
- }
- memmove(pt, pwd, pwdlen);
- pt[pwdlen] = '\0';
- return (pt);
- }
- }
-
- return (getcwd_physical(pt, size));
-}
-
-/*
- * char *realpath(const char *path, char resolved_path[MAXPATHLEN]);
- *
- * Find the real name of path, by removing all ".", ".." and symlink
- * components. Returns (resolved) on success, or (NULL) on failure,
- * in which case the path which caused trouble is left in (resolved).
- */
-char *
-realpath(path, resolved)
- const char *path;
- char *resolved;
-{
- struct stat sb;
- int fd, n, rootd, serrno;
- char *p, *q, wbuf[MAXPATHLEN];
- int symlinks = 0;
-
- /* Save the starting point. */
- if ((fd = open(".", O_RDONLY)) < 0) {
- (void)strcpy(resolved, ".");
- return (NULL);
- }
-
- /*
- * Find the dirname and basename from the path to be resolved.
- * Change directory to the dirname component.
- * lstat the basename part.
- * if it is a symlink, read in the value and loop.
- * if it is a directory, then change to that directory.
- * get the current directory name and append the basename.
- */
- (void)strncpy(resolved, path, MAXPATHLEN - 1);
- resolved[MAXPATHLEN - 1] = '\0';
-loop:
- q = strrchr(resolved, '/');
- if (q != NULL) {
- p = q + 1;
- if (q == resolved)
- q = "/";
- else {
- do {
- --q;
- } while (q > resolved && *q == '/');
- q[1] = '\0';
- q = resolved;
- }
- if (chdir(q) < 0)
- goto err1;
- } else
- p = resolved;
-
- /* Deal with the last component. */
- if (lstat(p, &sb) == 0) {
- if (S_ISLNK(sb.st_mode)) {
- if (++symlinks > MAXSYMLINKS) {
- errno = ELOOP;
- goto err1;
- }
- n = readlink(p, resolved, MAXPATHLEN-1);
- if (n < 0)
- goto err1;
- resolved[n] = '\0';
- goto loop;
- }
- if (S_ISDIR(sb.st_mode)) {
- if (chdir(p) < 0)
- goto err1;
- p = "";
- }
- }
-
- /*
- * Save the last component name and get the full pathname of
- * the current directory.
- */
- (void)strcpy(wbuf, p);
-
- /*
- * Call the inernal internal version of getcwd which
- * does a physical search rather than using the $PWD short-cut
- */
- if (getcwd_physical(resolved, MAXPATHLEN) == 0)
- goto err1;
-
- /*
- * Join the two strings together, ensuring that the right thing
- * happens if the last component is empty, or the dirname is root.
- */
- if (resolved[0] == '/' && resolved[1] == '\0')
- rootd = 1;
- else
- rootd = 0;
-
- if (*wbuf) {
- if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) {
- errno = ENAMETOOLONG;
- goto err1;
- }
- if (rootd == 0)
- (void)strcat(resolved, "/");
- (void)strcat(resolved, wbuf);
- }
-
- /* Go back to where we came from. */
- if (fchdir(fd) < 0) {
- serrno = errno;
- goto err2;
- }
-
- /* It's okay if the close fails, what's an fd more or less? */
- (void)close(fd);
- return (resolved);
-
-err1: serrno = errno;
- (void)fchdir(fd);
-err2: (void)close(fd);
- errno = serrno;
- return (NULL);
-}
-
-static char *
-getcwd_physical(pt, size)
- char *pt;
- size_t size;
-{
- register struct dirent *dp;
- register DIR *dir;
- register dev_t dev;
- register ino_t ino;
- register int first;
- register 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 + MAXPATHLEN;
- 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.
- */
- (void)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) {
- if ((up = realloc(up, upsize *= 2)) == NULL)
- goto err;
- 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, dp->d_namlen + 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 <= dp->d_namlen + (first ? 1 : 2)) {
- size_t len, off;
-
- if (!ptsize) {
- errno = ERANGE;
- goto err;
- }
- off = bpt - pt;
- len = ept - bpt;
- if ((pt = realloc(pt, ptsize *= 2)) == NULL)
- goto err;
- bpt = pt + off;
- ept = pt + ptsize;
- (void)bcopy(bpt, ept - len, len);
- bpt = ept - len;
- }
- if (!first)
- *--bpt = '/';
- bpt -= dp->d_namlen;
- bcopy(dp->d_name, bpt, dp->d_namlen);
- (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);
- free(up);
- return (NULL);
-}
projects / apple / libc.git / blobdiff