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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20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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35 static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/types.h>
50 * The cd and pwd commands.
55 #include "nodes.h" /* for jobs.h */
68 static int cdlogical(char *);
69 static int cdphysical(char *);
70 static int docd(char *, int, int);
71 static char *getcomponent(char **);
72 static char *findcwd(char *);
73 static void updatepwd(char *);
74 static char *getpwd(void);
75 static char *getpwd2(void);
77 static char *curdir = NULL; /* current working directory */
80 cdcmd(int argc __unused, char **argv __unused)
86 int ch, phys, print = 0, getcwderr = 0;
91 while ((ch = nextopt("eLP")) != '\0') {
105 if (*argptr != NULL && argptr[1] != NULL)
106 error("too many arguments");
108 if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
109 error("HOME not set");
112 if (dest[0] == '-' && dest[1] == '\0') {
113 dest = bltinlookup("OLDPWD", 1);
115 error("OLDPWD not set");
118 if (dest[0] == '/' ||
119 (dest[0] == '.' && (dest[1] == '/' || dest[1] == '\0')) ||
120 (dest[0] == '.' && dest[1] == '.' && (dest[2] == '/' || dest[2] == '\0')) ||
121 (path = bltinlookup("CDPATH", 1)) == NULL)
123 while ((p = padvance(&path, NULL, dest)) != NULL) {
124 if (stat(p, &statb) < 0) {
127 } else if (!S_ISDIR(statb.st_mode))
134 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
135 print = strcmp(p + 2, dest);
137 print = strcmp(p, dest);
139 rc = docd(p, print, phys);
141 return getcwderr ? rc : 0;
146 error("%s: %s", dest, strerror(errno1));
153 * Actually change the directory. In an interactive shell, print the
154 * directory name if "print" is nonzero.
157 docd(char *dest, int print, int phys)
161 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
163 /* If logical cd fails, fall back to physical. */
164 if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0)
167 if (print && iflag && curdir) {
168 out1fmt("%s\n", curdir);
170 * Ignore write errors to preserve the invariant that the
171 * current directory is changed iff the exit status is 0
172 * (or 1 if -e was given and the full pathname could not be
183 cdlogical(char *dest)
194 * Check each component of the path. If we find a symlink or
195 * something we can't stat, clear curdir to force a getcwd()
196 * next time we get the value of the current directory.
199 path = stsavestr(dest);
206 while ((q = getcomponent(&path)) != NULL) {
207 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
214 if (equal(component, ".."))
217 if (lstat(stackblock(), &statb) < 0) {
224 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
234 cdphysical(char *dest)
240 if (chdir(dest) < 0) {
246 warning("warning: failed to get name of current directory");
255 * Get the next component of the path name pointed to by *path.
256 * This routine overwrites *path and the string pointed to by it.
259 getcomponent(char **path)
264 if ((p = *path) == NULL)
267 while (*p != '/' && *p != '\0')
287 * If our argument is NULL, we don't know the current directory
288 * any more because we traversed a symbolic link or something
289 * we couldn't stat().
291 if (dir == NULL || curdir == NULL)
293 path = stsavestr(dir);
297 if (STTOPC(new) == '/')
300 while ((p = getcomponent(&path)) != NULL) {
301 if (equal(p, "..")) {
302 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
303 } else if (*p != '\0' && ! equal(p, ".")) {
308 if (new == stackblock())
315 * Update curdir (the name of the current directory) in response to a
316 * cd command. We also call hashcd to let the routines in exec.c know
317 * that the current directory has changed.
324 hashcd(); /* update command hash table */
326 setvar("PWD", dir, VEXPORT);
327 setvar("OLDPWD", curdir, VEXPORT);
329 curdir = dir ? savestr(dir) : NULL;
334 pwdcmd(int argc __unused, char **argv __unused)
340 while ((ch = nextopt("LP")) != '\0') {
352 error("too many arguments");
354 if (!phys && getpwd()) {
358 if ((p = getpwd2()) == NULL)
359 error(".: %s", strerror(errno));
368 * Get the current directory and cache the result in curdir.
391 * Return the current directory.
399 for (i = MAXPWD;; i *= 2) {
401 if (getcwd(pwd, i) != NULL)
412 * Initialize PWD in a new shell.
413 * If the shell is interactive, we need to warn if this fails.
419 struct stat stdot, stpwd;
421 pwd = lookupvar("PWD");
422 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
423 stat(pwd, &stpwd) != -1 &&
424 stdot.st_dev == stpwd.st_dev &&
425 stdot.st_ino == stpwd.st_ino) {
428 curdir = savestr(pwd);
430 if (getpwd() == NULL && warn)
431 out2fmt_flush("sh: cannot determine working directory\n");
432 setvar("PWD", curdir, VEXPORT);