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36 * @(#)cd.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/cd.c,v 1.35 2006/06/12 21:06:00 stefanf Exp $
38 * $DragonFly: src/bin/sh/cd.c,v 1.5 2007/01/05 22:18:52 pavalos Exp $
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 int updatepwd(char *);
73 STATIC char *curdir = NULL; /* current working directory */
74 STATIC char *prevdir; /* previous working directory */
75 STATIC char *cdcomppath;
78 cdcmd(int argc, char **argv)
84 int ch, phys, print = 0;
86 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
88 while ((ch = getopt(argc, argv, "LP")) != -1) {
97 error("unknown option: -%c", optopt);
105 error("too many arguments");
107 if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
108 error("HOME not set");
111 if (dest[0] == '-' && dest[1] == '\0') {
112 dest = prevdir ? prevdir : curdir;
118 if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
120 while ((p = padvance(&path, dest)) != NULL) {
121 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
126 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
127 print = strcmp(p + 2, dest);
129 print = strcmp(p, dest);
131 if (docd(p, print, phys) >= 0)
135 error("can't cd to %s", dest);
142 * Actually change the directory. In an interactive shell, print the
143 * directory name if "print" is nonzero.
146 docd(char *dest, int print, int phys)
149 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
151 /* If logical cd fails, fall back to physical. */
152 if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
155 if (print && iflag && curdir)
156 out1fmt("%s\n", curdir);
162 cdlogical(char *dest)
172 * Check each component of the path. If we find a symlink or
173 * something we can't stat, clear curdir to force a getcwd()
174 * next time we get the value of the current directory.
177 cdcomppath = stalloc(strlen(dest) + 1);
178 scopy(dest, cdcomppath);
185 while ((q = getcomponent()) != NULL) {
186 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
194 if (equal(component, ".."))
197 if (lstat(stackblock(), &statb) < 0) {
204 if (updatepwd(badstat ? NULL : dest) < 0 || chdir(curdir) < 0) {
213 cdphysical(char *dest)
217 if (chdir(dest) < 0 || updatepwd(NULL) < 0) {
226 * Get the next component of the path name pointed to by cdcomppath.
227 * This routine overwrites the string pointed to by cdcomppath.
235 if ((p = cdcomppath) == NULL)
238 while (*p != '/' && *p != '\0')
251 * Update curdir (the name of the current directory) in response to a
252 * cd command. We also call hashcd to let the routines in exec.c know
253 * that the current directory has changed.
261 hashcd(); /* update command hash table */
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) {
274 if (getpwd() == NULL) {
278 setvar("PWD", curdir, VEXPORT);
279 setvar("OLDPWD", prevdir, VEXPORT);
283 cdcomppath = stalloc(strlen(dir) + 1);
284 scopy(dir, cdcomppath);
293 while ((p = getcomponent()) != NULL) {
294 if (equal(p, "..")) {
295 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
296 } else if (*p != '\0' && ! equal(p, ".")) {
302 if (new == stackblock())
309 curdir = savestr(stackblock());
310 setvar("PWD", curdir, VEXPORT);
311 setvar("OLDPWD", prevdir, VEXPORT);
318 pwdcmd(int argc, char **argv)
323 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
325 while ((ch = getopt(argc, argv, "LP")) != -1) {
334 error("unknown option: -%c", optopt);
342 error("too many arguments");
344 if (!phys && getpwd()) {
348 if (getcwd(buf, sizeof(buf)) == NULL)
349 error(".: %s", strerror(errno));
358 * Find out what the current directory is. If we already know the current
359 * directory, this routine returns immediately.
368 if (getcwd(buf, sizeof(buf)) == NULL) {
369 char *pwd = getenv("PWD");
370 struct stat stdot, stpwd;
372 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
373 stat(pwd, &stpwd) != -1 &&
374 stdot.st_dev == stpwd.st_dev &&
375 stdot.st_ino == stpwd.st_ino) {
376 curdir = savestr(pwd);
381 curdir = savestr(buf);