Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / bin / sh / cd.c
CommitLineData
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1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#)cd.c 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/cd.c,v 1.20.2.3 2002/08/27 01:36:28 tjr Exp $
38 * $DragonFly: src/bin/sh/cd.c,v 1.2 2003/06/17 04:22:50 dillon Exp $
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39 */
40
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41#include <sys/types.h>
42#include <sys/stat.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include <errno.h>
47#include <limits.h>
48
49/*
50 * The cd and pwd commands.
51 */
52
53#include "shell.h"
54#include "var.h"
55#include "nodes.h" /* for jobs.h */
56#include "jobs.h"
57#include "options.h"
58#include "output.h"
59#include "memalloc.h"
60#include "error.h"
61#include "exec.h"
62#include "redir.h"
63#include "mystring.h"
64#include "show.h"
65#include "cd.h"
66
67STATIC int cdlogical(char *);
68STATIC int cdphysical(char *);
69STATIC int docd(char *, int, int);
70STATIC char *getcomponent(void);
71STATIC int updatepwd(char *);
72
73char *curdir = NULL; /* current working directory */
74char *prevdir; /* previous working directory */
75STATIC char *cdcomppath;
76
77int
78cdcmd(int argc, char **argv)
79{
80 char *dest;
81 char *path;
82 char *p;
83 struct stat statb;
84 int ch, phys, print = 0;
85
86 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
87 phys = Pflag;
88 while ((ch = getopt(argc, argv, "LP")) != -1) {
89 switch (ch) {
90 case 'L':
91 phys = 0;
92 break;
93 case 'P':
94 phys = 1;
95 break;
96 default:
97 error("unknown option: -%c", optopt);
98 break;
99 }
100 }
101 argc -= optind;
102 argv += optind;
103
104 if (argc > 1)
105 error("too many arguments");
106
107 if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
108 error("HOME not set");
109 if (*dest == '\0')
110 dest = ".";
111 if (dest[0] == '-' && dest[1] == '\0') {
112 dest = prevdir ? prevdir : curdir;
113 if (dest)
114 print = 1;
115 else
116 dest = ".";
117 }
118 if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
119 path = nullstr;
120 while ((p = padvance(&path, dest)) != NULL) {
121 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
122 if (!print) {
123 /*
124 * XXX - rethink
125 */
126 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
127 p += 2;
128 print = strcmp(p, dest);
129 }
130 if (docd(p, print, phys) >= 0)
131 return 0;
132 }
133 }
134 error("can't cd to %s", dest);
135 /*NOTREACHED*/
136 return 0;
137}
138
139
140/*
141 * Actually change the directory. In an interactive shell, print the
142 * directory name if "print" is nonzero.
143 */
144STATIC int
145docd(char *dest, int print, int phys)
146{
147
148 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
149
150 /* If logical cd fails, fall back to physical. */
151 if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
152 return (-1);
153
154 if (print && iflag && curdir)
155 out1fmt("%s\n", curdir);
156
157 return 0;
158}
159
160STATIC int
161cdlogical(char *dest)
162{
163 char *p;
164 char *q;
165 char *component;
166 struct stat statb;
167 int first;
168 int badstat;
169
170 /*
171 * Check each component of the path. If we find a symlink or
172 * something we can't stat, clear curdir to force a getcwd()
173 * next time we get the value of the current directory.
174 */
175 badstat = 0;
176 cdcomppath = stalloc(strlen(dest) + 1);
177 scopy(dest, cdcomppath);
178 STARTSTACKSTR(p);
179 if (*dest == '/') {
180 STPUTC('/', p);
181 cdcomppath++;
182 }
183 first = 1;
184 while ((q = getcomponent()) != NULL) {
185 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
186 continue;
187 if (! first)
188 STPUTC('/', p);
189 first = 0;
190 component = q;
191 while (*q)
192 STPUTC(*q++, p);
193 if (equal(component, ".."))
194 continue;
195 STACKSTRNUL(p);
196 if (lstat(stackblock(), &statb) < 0) {
197 badstat = 1;
198 break;
199 }
200 }
201
202 INTOFF;
203 if (updatepwd(badstat ? NULL : dest) < 0 || chdir(curdir) < 0) {
204 INTON;
205 return (-1);
206 }
207 INTON;
208 return (0);
209}
210
211STATIC int
212cdphysical(char *dest)
213{
214
215 INTOFF;
216 if (chdir(dest) < 0 || updatepwd(NULL) < 0) {
217 INTON;
218 return (-1);
219 }
220 INTON;
221 return (0);
222}
223
224/*
225 * Get the next component of the path name pointed to by cdcomppath.
226 * This routine overwrites the string pointed to by cdcomppath.
227 */
228STATIC char *
229getcomponent(void)
230{
231 char *p;
232 char *start;
233
234 if ((p = cdcomppath) == NULL)
235 return NULL;
236 start = cdcomppath;
237 while (*p != '/' && *p != '\0')
238 p++;
239 if (*p == '\0') {
240 cdcomppath = NULL;
241 } else {
242 *p++ = '\0';
243 cdcomppath = p;
244 }
245 return start;
246}
247
248
249/*
250 * Update curdir (the name of the current directory) in response to a
251 * cd command. We also call hashcd to let the routines in exec.c know
252 * that the current directory has changed.
253 */
254STATIC int
255updatepwd(char *dir)
256{
257 char *new;
258 char *p;
259
260 hashcd(); /* update command hash table */
261
262 /*
263 * If our argument is NULL, we don't know the current directory
264 * any more because we traversed a symbolic link or something
265 * we couldn't stat().
266 */
267 if (dir == NULL || curdir == NULL) {
268 if (prevdir)
269 ckfree(prevdir);
270 INTOFF;
271 prevdir = curdir;
272 curdir = NULL;
273 if (getpwd() == NULL) {
274 INTON;
275 return (-1);
276 }
277 setvar("PWD", curdir, VEXPORT);
278 setvar("OLDPWD", prevdir, VEXPORT);
279 INTON;
280 return (0);
281 }
282 cdcomppath = stalloc(strlen(dir) + 1);
283 scopy(dir, cdcomppath);
284 STARTSTACKSTR(new);
285 if (*dir != '/') {
286 p = curdir;
287 while (*p)
288 STPUTC(*p++, new);
289 if (p[-1] == '/')
290 STUNPUTC(new);
291 }
292 while ((p = getcomponent()) != NULL) {
293 if (equal(p, "..")) {
294 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
295 } else if (*p != '\0' && ! equal(p, ".")) {
296 STPUTC('/', new);
297 while (*p)
298 STPUTC(*p++, new);
299 }
300 }
301 if (new == stackblock())
302 STPUTC('/', new);
303 STACKSTRNUL(new);
304 INTOFF;
305 if (prevdir)
306 ckfree(prevdir);
307 prevdir = curdir;
308 curdir = savestr(stackblock());
309 setvar("PWD", curdir, VEXPORT);
310 setvar("OLDPWD", prevdir, VEXPORT);
311 INTON;
312
313 return (0);
314}
315
316int
317pwdcmd(int argc, char **argv)
318{
319 char buf[PATH_MAX];
320 int ch, phys;
321
322 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
323 phys = Pflag;
324 while ((ch = getopt(argc, argv, "LP")) != -1) {
325 switch (ch) {
326 case 'L':
327 phys = 0;
328 break;
329 case 'P':
330 phys = 1;
331 break;
332 default:
333 error("unknown option: -%c", optopt);
334 break;
335 }
336 }
337 argc -= optind;
338 argv += optind;
339
340 if (argc != 0)
341 error("too many arguments");
342
343 if (!phys && getpwd()) {
344 out1str(curdir);
345 out1c('\n');
346 } else {
347 if (getcwd(buf, sizeof(buf)) == NULL)
348 error(".: %s", strerror(errno));
349 out1str(buf);
350 out1c('\n');
351 }
352
353 return 0;
354}
355
356/*
357 * Find out what the current directory is. If we already know the current
358 * directory, this routine returns immediately.
359 */
360char *
361getpwd(void)
362{
363 char buf[PATH_MAX];
364
365 if (curdir)
366 return curdir;
367 if (getcwd(buf, sizeof(buf)) == NULL) {
368 char *pwd = getenv("PWD");
369 struct stat stdot, stpwd;
370
371 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
372 stat(pwd, &stpwd) != -1 &&
373 stdot.st_dev == stpwd.st_dev &&
374 stdot.st_ino == stpwd.st_ino) {
375 curdir = savestr(pwd);
376 return curdir;
377 }
378 return NULL;
379 }
380 curdir = savestr(buf);
381
382 return curdir;
383}