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36 * @(#)cd.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/cd.c,v 1.45 2010/12/21 20:47:06 jilles Exp $
40 #include <sys/types.h>
49 * The cd and pwd commands.
54 #include "nodes.h" /* for jobs.h */
66 static int cdlogical(char *);
67 static int cdphysical(char *);
68 static int docd(char *, int, int);
69 static char *getcomponent(void);
70 static char *findcwd(char *);
71 static void updatepwd(char *);
72 static char *getpwd(void);
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;
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'))
195 if (equal(component, ".."))
198 if (lstat(stackblock(), &statb) < 0) {
205 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
215 cdphysical(char *dest)
220 if (chdir(dest) < 0) {
226 warning("warning: failed to get name of current directory");
233 * Get the next component of the path name pointed to by cdcomppath.
234 * This routine overwrites the string pointed to by cdcomppath.
242 if ((p = cdcomppath) == NULL)
245 while (*p != '/' && *p != '\0')
264 * If our argument is NULL, we don't know the current directory
265 * any more because we traversed a symbolic link or something
266 * we couldn't stat().
268 if (dir == NULL || curdir == NULL)
270 cdcomppath = stalloc(strlen(dir) + 1);
271 scopy(dir, cdcomppath);
275 if (STTOPC(new) == '/')
278 while ((p = getcomponent()) != NULL) {
279 if (equal(p, "..")) {
280 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
281 } else if (*p != '\0' && ! equal(p, ".")) {
286 if (new == stackblock())
293 * Update curdir (the name of the current directory) in response to a
294 * cd command. We also call hashcd to let the routines in exec.c know
295 * that the current directory has changed.
300 hashcd(); /* update command hash table */
305 curdir = dir ? savestr(dir) : NULL;
306 setvar("PWD", curdir, VEXPORT);
307 setvar("OLDPWD", prevdir, VEXPORT);
311 pwdcmd(int argc, char **argv)
316 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
318 while ((ch = getopt(argc, argv, "LP")) != -1) {
327 error("unknown option: -%c", optopt);
335 error("too many arguments");
337 if (!phys && getpwd()) {
341 if ((p = getpwd2()) == NULL)
342 error(".: %s", strerror(errno));
351 * Get the current directory and cache the result in curdir.
371 * Return the current directory.
379 for (i = MAXPWD;; i *= 2) {
381 if (getcwd(pwd, i) != NULL)
392 * Initialize PWD in a new shell.
393 * If the shell is interactive, we need to warn if this fails.
399 struct stat stdot, stpwd;
401 pwd = lookupvar("PWD");
402 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
403 stat(pwd, &stpwd) != -1 &&
404 stdot.st_dev == stpwd.st_dev &&
405 stdot.st_ino == stpwd.st_ino) {
408 curdir = savestr(pwd);
410 if (getpwd() == NULL && warn)
411 out2fmt_flush("sh: cannot determine working directory\n");
412 setvar("PWD", curdir, VEXPORT);