2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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9 * modification, are permitted provided that the following conditions
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12 * notice, this list of conditions and the following disclaimer.
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17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
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20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
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24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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36 * @(#)cd.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: head/bin/sh/cd.c 240541 2012-09-15 21:56:30Z jilles $
40 #include <sys/types.h>
49 * The cd and pwd commands.
54 #include "nodes.h" /* for jobs.h */
67 static int cdlogical(char *);
68 static int cdphysical(char *);
69 static int docd(char *, int, int);
70 static char *getcomponent(void);
71 static char *findcwd(char *);
72 static void updatepwd(char *);
73 static char *getpwd(void);
74 static char *getpwd2(void);
76 static char *curdir = NULL; /* current working directory */
77 static char *prevdir; /* previous working directory */
78 static char *cdcomppath;
81 cdcmd(int argc __unused, char **argv __unused)
87 int ch, phys, print = 0, getcwderr = 0;
92 while ((ch = nextopt("eLP")) != '\0') {
106 if (*argptr != NULL && argptr[1] != NULL)
107 error("too many arguments");
109 if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
110 error("HOME not set");
113 if (dest[0] == '-' && dest[1] == '\0') {
114 dest = prevdir ? prevdir : curdir;
120 if (dest[0] == '/' ||
121 (dest[0] == '.' && (dest[1] == '/' || dest[1] == '\0')) ||
122 (dest[0] == '.' && dest[1] == '.' && (dest[2] == '/' || dest[2] == '\0')) ||
123 (path = bltinlookup("CDPATH", 1)) == NULL)
125 while ((p = padvance(&path, dest)) != NULL) {
126 if (stat(p, &statb) < 0) {
129 } else if (!S_ISDIR(statb.st_mode))
136 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
137 print = strcmp(p + 2, dest);
139 print = strcmp(p, dest);
141 rc = docd(p, print, phys);
143 return getcwderr ? rc : 0;
148 error("%s: %s", dest, strerror(errno1));
155 * Actually change the directory. In an interactive shell, print the
156 * directory name if "print" is nonzero.
159 docd(char *dest, int print, int phys)
163 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
165 /* If logical cd fails, fall back to physical. */
166 if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0)
169 if (print && iflag && curdir)
170 out1fmt("%s\n", curdir);
176 cdlogical(char *dest)
186 * Check each component of the path. If we find a symlink or
187 * something we can't stat, clear curdir to force a getcwd()
188 * next time we get the value of the current directory.
191 cdcomppath = stalloc(strlen(dest) + 1);
192 scopy(dest, cdcomppath);
199 while ((q = getcomponent()) != NULL) {
200 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
207 if (equal(component, ".."))
210 if (lstat(stackblock(), &statb) < 0) {
217 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
227 cdphysical(char *dest)
233 if (chdir(dest) < 0) {
239 warning("warning: failed to get name of current directory");
248 * Get the next component of the path name pointed to by cdcomppath.
249 * This routine overwrites the string pointed to by cdcomppath.
257 if ((p = cdcomppath) == NULL)
260 while (*p != '/' && *p != '\0')
279 * If our argument is NULL, we don't know the current directory
280 * any more because we traversed a symbolic link or something
281 * we couldn't stat().
283 if (dir == NULL || curdir == NULL)
285 cdcomppath = stalloc(strlen(dir) + 1);
286 scopy(dir, cdcomppath);
290 if (STTOPC(new) == '/')
293 while ((p = getcomponent()) != NULL) {
294 if (equal(p, "..")) {
295 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
296 } else if (*p != '\0' && ! equal(p, ".")) {
301 if (new == stackblock())
308 * Update curdir (the name of the current directory) in response to a
309 * cd command. We also call hashcd to let the routines in exec.c know
310 * that the current directory has changed.
315 hashcd(); /* update command hash table */
320 curdir = dir ? savestr(dir) : NULL;
321 setvar("PWD", curdir, VEXPORT);
322 setvar("OLDPWD", prevdir, VEXPORT);
326 pwdcmd(int argc __unused, char **argv __unused)
332 while ((ch = nextopt("LP")) != '\0') {
344 error("too many arguments");
346 if (!phys && getpwd()) {
350 if ((p = getpwd2()) == NULL)
351 error(".: %s", strerror(errno));
360 * Get the current directory and cache the result in curdir.
380 * Return the current directory.
388 for (i = MAXPWD;; i *= 2) {
390 if (getcwd(pwd, i) != NULL)
401 * Initialize PWD in a new shell.
402 * If the shell is interactive, we need to warn if this fails.
408 struct stat stdot, stpwd;
410 pwd = lookupvar("PWD");
411 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
412 stat(pwd, &stpwd) != -1 &&
413 stdot.st_dev == stpwd.st_dev &&
414 stdot.st_ino == stpwd.st_ino) {
417 curdir = savestr(pwd);
419 if (getpwd() == NULL && warn)
420 out2fmt_flush("sh: cannot determine working directory\n");
421 setvar("PWD", curdir, VEXPORT);