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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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, char **argv)
88 int ch, phys, print = 0, getcwderr = 0;
92 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
94 while ((ch = getopt(argc, argv, "eLP")) != -1) {
106 error("unknown option: -%c", optopt);
114 error("too many arguments");
116 if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
117 error("HOME not set");
120 if (dest[0] == '-' && dest[1] == '\0') {
121 dest = prevdir ? prevdir : curdir;
127 if (dest[0] == '/' ||
128 (dest[0] == '.' && (dest[1] == '/' || dest[1] == '\0')) ||
129 (dest[0] == '.' && dest[1] == '.' && (dest[2] == '/' || dest[2] == '\0')) ||
130 (path = bltinlookup("CDPATH", 1)) == NULL)
132 while ((p = padvance(&path, dest)) != NULL) {
133 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
138 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
139 print = strcmp(p + 2, dest);
141 print = strcmp(p, dest);
143 rc = docd(p, print, phys);
145 return getcwderr ? rc : 0;
150 error("%s: %s", dest, strerror(errno1));
157 * Actually change the directory. In an interactive shell, print the
158 * directory name if "print" is nonzero.
161 docd(char *dest, int print, int phys)
165 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
167 /* If logical cd fails, fall back to physical. */
168 if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0)
171 if (print && iflag && curdir)
172 out1fmt("%s\n", curdir);
178 cdlogical(char *dest)
188 * Check each component of the path. If we find a symlink or
189 * something we can't stat, clear curdir to force a getcwd()
190 * next time we get the value of the current directory.
193 cdcomppath = stalloc(strlen(dest) + 1);
194 scopy(dest, cdcomppath);
201 while ((q = getcomponent()) != NULL) {
202 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
209 if (equal(component, ".."))
212 if (lstat(stackblock(), &statb) < 0) {
219 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
229 cdphysical(char *dest)
235 if (chdir(dest) < 0) {
241 warning("warning: failed to get name of current directory");
250 * Get the next component of the path name pointed to by cdcomppath.
251 * This routine overwrites the string pointed to by cdcomppath.
259 if ((p = cdcomppath) == NULL)
262 while (*p != '/' && *p != '\0')
281 * If our argument is NULL, we don't know the current directory
282 * any more because we traversed a symbolic link or something
283 * we couldn't stat().
285 if (dir == NULL || curdir == NULL)
287 cdcomppath = stalloc(strlen(dir) + 1);
288 scopy(dir, cdcomppath);
292 if (STTOPC(new) == '/')
295 while ((p = getcomponent()) != NULL) {
296 if (equal(p, "..")) {
297 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
298 } else if (*p != '\0' && ! equal(p, ".")) {
303 if (new == stackblock())
310 * Update curdir (the name of the current directory) in response to a
311 * cd command. We also call hashcd to let the routines in exec.c know
312 * that the current directory has changed.
317 hashcd(); /* update command hash table */
322 curdir = dir ? savestr(dir) : NULL;
323 setvar("PWD", curdir, VEXPORT);
324 setvar("OLDPWD", prevdir, VEXPORT);
328 pwdcmd(int argc, char **argv)
333 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
335 while ((ch = getopt(argc, argv, "LP")) != -1) {
344 error("unknown option: -%c", optopt);
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.
388 * Return the current directory.
396 for (i = MAXPWD;; i *= 2) {
398 if (getcwd(pwd, i) != NULL)
409 * Initialize PWD in a new shell.
410 * If the shell is interactive, we need to warn if this fails.
416 struct stat stdot, stpwd;
418 pwd = lookupvar("PWD");
419 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
420 stat(pwd, &stpwd) != -1 &&
421 stdot.st_dev == stpwd.st_dev &&
422 stdot.st_ino == stpwd.st_ino) {
425 curdir = savestr(pwd);
427 if (getpwd() == NULL && warn)
428 out2fmt_flush("sh: cannot determine working directory\n");
429 setvar("PWD", curdir, VEXPORT);