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 */
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 *getpwd2(void);
75 static char *curdir = NULL; /* current working directory */
76 static char *prevdir; /* previous working directory */
77 static char *cdcomppath;
80 cdcmd(int argc, char **argv)
86 int ch, phys, print = 0;
89 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
91 while ((ch = getopt(argc, argv, "LP")) != -1) {
100 error("unknown option: -%c", optopt);
108 error("too many arguments");
110 if ((dest = *argv) == 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 == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
123 while ((p = padvance(&path, 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 if (docd(p, print, phys) >= 0)
145 error("%s: %s", dest, strerror(errno1));
152 * Actually change the directory. In an interactive shell, print the
153 * directory name if "print" is nonzero.
156 docd(char *dest, int print, int phys)
159 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
161 /* If logical cd fails, fall back to physical. */
162 if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
165 if (print && iflag && curdir)
166 out1fmt("%s\n", curdir);
172 cdlogical(char *dest)
182 * Check each component of the path. If we find a symlink or
183 * something we can't stat, clear curdir to force a getcwd()
184 * next time we get the value of the current directory.
187 cdcomppath = stalloc(strlen(dest) + 1);
188 scopy(dest, cdcomppath);
195 while ((q = getcomponent()) != NULL) {
196 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
204 if (equal(component, ".."))
207 if (lstat(stackblock(), &statb) < 0) {
214 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
224 cdphysical(char *dest)
229 if (chdir(dest) < 0 || (p = findcwd(NULL)) == NULL) {
239 * Get the next component of the path name pointed to by cdcomppath.
240 * This routine overwrites the string pointed to by cdcomppath.
248 if ((p = cdcomppath) == NULL)
251 while (*p != '/' && *p != '\0')
270 * If our argument is NULL, we don't know the current directory
271 * any more because we traversed a symbolic link or something
272 * we couldn't stat().
274 if (dir == NULL || curdir == NULL)
276 cdcomppath = stalloc(strlen(dir) + 1);
277 scopy(dir, cdcomppath);
286 while ((p = getcomponent()) != NULL) {
287 if (equal(p, "..")) {
288 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
289 } else if (*p != '\0' && ! equal(p, ".")) {
295 if (new == stackblock())
302 * Update curdir (the name of the current directory) in response to a
303 * cd command. We also call hashcd to let the routines in exec.c know
304 * that the current directory has changed.
309 hashcd(); /* update command hash table */
314 curdir = savestr(dir);
315 setvar("PWD", curdir, VEXPORT);
316 setvar("OLDPWD", prevdir, VEXPORT);
320 pwdcmd(int argc, char **argv)
325 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
327 while ((ch = getopt(argc, argv, "LP")) != -1) {
336 error("unknown option: -%c", optopt);
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.
385 struct stat stdot, stpwd;
389 for (i = MAXPWD;; i *= 2) {
391 if (getcwd(pwd, i) != NULL)
399 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
400 stat(pwd, &stpwd) != -1 &&
401 stdot.st_dev == stpwd.st_dev &&
402 stdot.st_ino == stpwd.st_ino) {