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(void);
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 */
78 static char *prevdir; /* previous working directory */
79 static char *cdcomppath;
82 cdcmd(int argc __unused, char **argv __unused)
88 int ch, phys, print = 0, getcwderr = 0;
93 while ((ch = nextopt("eLP")) != '\0') {
107 if (*argptr != NULL && argptr[1] != NULL)
108 error("too many arguments");
110 if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
111 error("HOME not set");
114 if (dest[0] == '-' && dest[1] == '\0') {
115 dest = prevdir ? prevdir : curdir;
121 if (dest[0] == '/' ||
122 (dest[0] == '.' && (dest[1] == '/' || dest[1] == '\0')) ||
123 (dest[0] == '.' && dest[1] == '.' && (dest[2] == '/' || dest[2] == '\0')) ||
124 (path = bltinlookup("CDPATH", 1)) == NULL)
126 while ((p = padvance(&path, dest)) != NULL) {
127 if (stat(p, &statb) < 0) {
130 } else if (!S_ISDIR(statb.st_mode))
137 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
138 print = strcmp(p + 2, dest);
140 print = strcmp(p, dest);
142 rc = docd(p, print, phys);
144 return getcwderr ? rc : 0;
149 error("%s: %s", dest, strerror(errno1));
156 * Actually change the directory. In an interactive shell, print the
157 * directory name if "print" is nonzero.
160 docd(char *dest, int print, int phys)
164 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
166 /* If logical cd fails, fall back to physical. */
167 if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0)
170 if (print && iflag && curdir)
171 out1fmt("%s\n", curdir);
177 cdlogical(char *dest)
187 * Check each component of the path. If we find a symlink or
188 * something we can't stat, clear curdir to force a getcwd()
189 * next time we get the value of the current directory.
192 cdcomppath = stsavestr(dest);
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 = stsavestr(dir);
289 if (STTOPC(new) == '/')
292 while ((p = getcomponent()) != NULL) {
293 if (equal(p, "..")) {
294 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
295 } else if (*p != '\0' && ! equal(p, ".")) {
300 if (new == stackblock())
307 * Update curdir (the name of the current directory) in response to a
308 * cd command. We also call hashcd to let the routines in exec.c know
309 * that the current directory has changed.
314 hashcd(); /* update command hash table */
319 curdir = dir ? savestr(dir) : NULL;
320 setvar("PWD", curdir, VEXPORT);
321 setvar("OLDPWD", prevdir, VEXPORT);
325 pwdcmd(int argc __unused, char **argv __unused)
331 while ((ch = nextopt("LP")) != '\0') {
343 error("too many arguments");
345 if (!phys && getpwd()) {
349 if ((p = getpwd2()) == NULL)
350 error(".: %s", strerror(errno));
359 * Get the current directory and cache the result in curdir.
379 * Return the current directory.
387 for (i = MAXPWD;; i *= 2) {
389 if (getcwd(pwd, i) != NULL)
400 * Initialize PWD in a new shell.
401 * If the shell is interactive, we need to warn if this fails.
407 struct stat stdot, stpwd;
409 pwd = lookupvar("PWD");
410 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
411 stat(pwd, &stpwd) != -1 &&
412 stdot.st_dev == stpwd.st_dev &&
413 stdot.st_ino == stpwd.st_ino) {
416 curdir = savestr(pwd);
418 if (getpwd() == NULL && warn)
419 out2fmt_flush("sh: cannot determine working directory\n");
420 setvar("PWD", curdir, VEXPORT);