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*** 0 ****
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+
+ /*
+ * Copyright (c) 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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 <errno.h>
+ #include <fcntl.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <unistd.h>
+ #include <sys/param.h>
+ #include <sys/stat.h>
+
+ #include "path.h"
+
+ char *
+ path_resolve(
+ char *outbuf,
+ size_t outsize,
+ const char *path)
+ {
+ struct stat sb;
+ int fd, n, rootd, serrno;
+ char *p, *q, wbuf[MAXPATHLEN];
+ char resolved[MAXPATHLEN];
+ int symlinks = 0;
+
+ /* save the starting point */
+ if ((fd = open(".", O_RDONLY)) < 0) {
+ 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.
+ */
+ strncpy(resolved, path, MAXPATHLEN - 1);
+ resolved[MAXPATHLEN-1] = '\0';
+ loop:
+ if ((q = strrchr(resolved, '/')) != 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 (*p != '\0' && 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.
+ */
+ strcpy(wbuf, p);
+ if (getcwd(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)
+ strcat(resolved, "/");
+ 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? */
+ close(fd);
+ strncpy(outbuf, resolved, outsize);
+ outbuf[outsize-1] = '\0';
+ return outbuf;
+
+ err1:
+ serrno = errno;
+ fchdir(fd);
+ err2:
+ close(fd);
+ errno = serrno;
+ return NULL;
+ }
+
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