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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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(char *, size_t);
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;
88 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
90 while ((ch = getopt(argc, argv, "LP")) != -1) {
99 error("unknown option: -%c", optopt);
107 error("too many arguments");
109 if ((dest = *argv) == 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 == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
122 while ((p = padvance(&path, dest)) != NULL) {
123 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
128 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
129 print = strcmp(p + 2, dest);
131 print = strcmp(p, dest);
133 if (docd(p, print, phys) >= 0)
137 error("can't cd to %s", dest);
144 * Actually change the directory. In an interactive shell, print the
145 * directory name if "print" is nonzero.
148 docd(char *dest, int print, int phys)
151 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
153 /* If logical cd fails, fall back to physical. */
154 if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
157 if (print && iflag && curdir)
158 out1fmt("%s\n", curdir);
164 cdlogical(char *dest)
174 * Check each component of the path. If we find a symlink or
175 * something we can't stat, clear curdir to force a getcwd()
176 * next time we get the value of the current directory.
179 cdcomppath = stalloc(strlen(dest) + 1);
180 scopy(dest, cdcomppath);
187 while ((q = getcomponent()) != NULL) {
188 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
196 if (equal(component, ".."))
199 if (lstat(stackblock(), &statb) < 0) {
206 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
216 cdphysical(char *dest)
221 if (chdir(dest) < 0 || (p = findcwd(NULL)) == NULL) {
231 * Get the next component of the path name pointed to by cdcomppath.
232 * This routine overwrites the string pointed to by cdcomppath.
240 if ((p = cdcomppath) == NULL)
243 while (*p != '/' && *p != '\0')
262 * If our argument is NULL, we don't know the current directory
263 * any more because we traversed a symbolic link or something
264 * we couldn't stat().
266 if (dir == NULL || curdir == NULL) {
267 p = stalloc(PATH_MAX);
268 return getpwd2(p, PATH_MAX);
270 cdcomppath = stalloc(strlen(dir) + 1);
271 scopy(dir, cdcomppath);
280 while ((p = getcomponent()) != NULL) {
281 if (equal(p, "..")) {
282 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
283 } else if (*p != '\0' && ! equal(p, ".")) {
289 if (new == stackblock())
296 * Update curdir (the name of the current directory) in response to a
297 * cd command. We also call hashcd to let the routines in exec.c know
298 * that the current directory has changed.
303 hashcd(); /* update command hash table */
308 curdir = savestr(dir);
309 setvar("PWD", curdir, VEXPORT);
310 setvar("OLDPWD", prevdir, VEXPORT);
314 pwdcmd(int argc, char **argv)
319 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
321 while ((ch = getopt(argc, argv, "LP")) != -1) {
330 error("unknown option: -%c", optopt);
338 error("too many arguments");
340 if (!phys && getpwd()) {
344 if (getcwd(buf, sizeof(buf)) == NULL)
345 error(".: %s", strerror(errno));
354 * Get the current directory and cache the result in curdir.
365 p = getpwd2(buf, sizeof(buf));
373 * Return the current directory.
376 getpwd2(char *buf, size_t size)
378 if (getcwd(buf, size) == NULL) {
379 char *pwd = getenv("PWD");
380 struct stat stdot, stpwd;
382 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
383 stat(pwd, &stpwd) != -1 &&
384 stdot.st_dev == stpwd.st_dev &&
385 stdot.st_ino == stpwd.st_ino) {