sh: Fix duplicate prototypes for builtins.
[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
c3e3bc7a 37 * $FreeBSD: src/bin/sh/cd.c,v 1.49 2011/06/13 21:03:27 jilles Exp $
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38 */
39
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40#include <sys/types.h>
41#include <sys/stat.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45#include <errno.h>
46#include <limits.h>
47
48/*
49 * The cd and pwd commands.
50 */
51
52#include "shell.h"
53#include "var.h"
54#include "nodes.h" /* for jobs.h */
55#include "jobs.h"
56#include "options.h"
57#include "output.h"
58#include "memalloc.h"
59#include "error.h"
60#include "exec.h"
61#include "redir.h"
62#include "mystring.h"
63#include "show.h"
64#include "cd.h"
c3e3bc7a 65#include "builtins.h"
984263bc 66
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67static int cdlogical(char *);
68static int cdphysical(char *);
69static int docd(char *, int, int);
70static char *getcomponent(void);
71static char *findcwd(char *);
72static void updatepwd(char *);
73static char *getpwd(void);
74static char *getpwd2(void);
984263bc 75
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76static char *curdir = NULL; /* current working directory */
77static char *prevdir; /* previous working directory */
78static char *cdcomppath;
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79
80int
81cdcmd(int argc, char **argv)
82{
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83 const char *dest;
84 const char *path;
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85 char *p;
86 struct stat statb;
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87 int ch, phys, print = 0, getcwderr = 0;
88 int rc;
72cbf401 89 int errno1 = ENOENT;
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90
91 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
92 phys = Pflag;
8c603ea4 93 while ((ch = getopt(argc, argv, "eLP")) != -1) {
984263bc 94 switch (ch) {
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95 case 'e':
96 getcwderr = 1;
97 break;
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98 case 'L':
99 phys = 0;
100 break;
101 case 'P':
102 phys = 1;
103 break;
104 default:
105 error("unknown option: -%c", optopt);
106 break;
107 }
108 }
109 argc -= optind;
110 argv += optind;
111
112 if (argc > 1)
113 error("too many arguments");
114
115 if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
116 error("HOME not set");
117 if (*dest == '\0')
118 dest = ".";
119 if (dest[0] == '-' && dest[1] == '\0') {
120 dest = prevdir ? prevdir : curdir;
121 if (dest)
122 print = 1;
123 else
124 dest = ".";
125 }
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126 if (dest[0] == '/' ||
127 (dest[0] == '.' && (dest[1] == '/' || dest[1] == '\0')) ||
128 (dest[0] == '.' && dest[1] == '.' && (dest[2] == '/' || dest[2] == '\0')) ||
129 (path = bltinlookup("CDPATH", 1)) == NULL)
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130 path = nullstr;
131 while ((p = padvance(&path, dest)) != NULL) {
132 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
133 if (!print) {
134 /*
135 * XXX - rethink
136 */
137 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
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138 print = strcmp(p + 2, dest);
139 else
140 print = strcmp(p, dest);
984263bc 141 }
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142 rc = docd(p, print, phys);
143 if (rc >= 0)
144 return getcwderr ? rc : 0;
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145 if (errno != ENOENT)
146 errno1 = errno;
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147 }
148 }
72cbf401 149 error("%s: %s", dest, strerror(errno1));
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150 /*NOTREACHED*/
151 return 0;
152}
153
154
155/*
156 * Actually change the directory. In an interactive shell, print the
157 * directory name if "print" is nonzero.
158 */
99512ac4 159static int
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160docd(char *dest, int print, int phys)
161{
8c603ea4 162 int rc;
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163
164 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
165
166 /* If logical cd fails, fall back to physical. */
8c603ea4 167 if ((phys || (rc = cdlogical(dest)) < 0) && (rc = cdphysical(dest)) < 0)
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168 return (-1);
169
170 if (print && iflag && curdir)
171 out1fmt("%s\n", curdir);
172
8c603ea4 173 return (rc);
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174}
175
99512ac4 176static int
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177cdlogical(char *dest)
178{
179 char *p;
180 char *q;
181 char *component;
182 struct stat statb;
183 int first;
184 int badstat;
185
186 /*
187 * Check each component of the path. If we find a symlink or
188 * something we can't stat, clear curdir to force a getcwd()
189 * next time we get the value of the current directory.
190 */
191 badstat = 0;
192 cdcomppath = stalloc(strlen(dest) + 1);
193 scopy(dest, cdcomppath);
194 STARTSTACKSTR(p);
195 if (*dest == '/') {
196 STPUTC('/', p);
197 cdcomppath++;
198 }
199 first = 1;
200 while ((q = getcomponent()) != NULL) {
201 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
202 continue;
203 if (! first)
204 STPUTC('/', p);
205 first = 0;
206 component = q;
99512ac4 207 STPUTS(q, p);
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208 if (equal(component, ".."))
209 continue;
210 STACKSTRNUL(p);
211 if (lstat(stackblock(), &statb) < 0) {
212 badstat = 1;
213 break;
214 }
215 }
216
217 INTOFF;
99512ac4 218 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
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219 INTON;
220 return (-1);
221 }
99512ac4 222 updatepwd(p);
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223 INTON;
224 return (0);
225}
226
99512ac4 227static int
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228cdphysical(char *dest)
229{
99512ac4 230 char *p;
8c603ea4 231 int rc = 0;
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232
233 INTOFF;
99512ac4 234 if (chdir(dest) < 0) {
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235 INTON;
236 return (-1);
237 }
99512ac4 238 p = findcwd(NULL);
8c603ea4 239 if (p == NULL) {
99512ac4 240 warning("warning: failed to get name of current directory");
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241 rc = 1;
242 }
99512ac4 243 updatepwd(p);
984263bc 244 INTON;
8c603ea4 245 return (rc);
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246}
247
248/*
249 * Get the next component of the path name pointed to by cdcomppath.
250 * This routine overwrites the string pointed to by cdcomppath.
251 */
99512ac4 252static char *
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253getcomponent(void)
254{
255 char *p;
256 char *start;
257
258 if ((p = cdcomppath) == NULL)
259 return NULL;
260 start = cdcomppath;
261 while (*p != '/' && *p != '\0')
262 p++;
263 if (*p == '\0') {
264 cdcomppath = NULL;
265 } else {
266 *p++ = '\0';
267 cdcomppath = p;
268 }
269 return start;
270}
271
272
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273static char *
274findcwd(char *dir)
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275{
276 char *new;
277 char *p;
278
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279 /*
280 * If our argument is NULL, we don't know the current directory
281 * any more because we traversed a symbolic link or something
282 * we couldn't stat().
283 */
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284 if (dir == NULL || curdir == NULL)
285 return getpwd2();
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286 cdcomppath = stalloc(strlen(dir) + 1);
287 scopy(dir, cdcomppath);
288 STARTSTACKSTR(new);
289 if (*dir != '/') {
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290 STPUTS(curdir, new);
291 if (STTOPC(new) == '/')
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292 STUNPUTC(new);
293 }
294 while ((p = getcomponent()) != NULL) {
295 if (equal(p, "..")) {
296 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
297 } else if (*p != '\0' && ! equal(p, ".")) {
298 STPUTC('/', new);
99512ac4 299 STPUTS(p, new);
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300 }
301 }
302 if (new == stackblock())
303 STPUTC('/', new);
304 STACKSTRNUL(new);
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305 return stackblock();
306}
307
308/*
309 * Update curdir (the name of the current directory) in response to a
310 * cd command. We also call hashcd to let the routines in exec.c know
311 * that the current directory has changed.
312 */
313static void
314updatepwd(char *dir)
315{
316 hashcd(); /* update command hash table */
317
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318 if (prevdir)
319 ckfree(prevdir);
320 prevdir = curdir;
99512ac4 321 curdir = dir ? savestr(dir) : NULL;
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322 setvar("PWD", curdir, VEXPORT);
323 setvar("OLDPWD", prevdir, VEXPORT);
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324}
325
326int
327pwdcmd(int argc, char **argv)
328{
99512ac4 329 char *p;
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330 int ch, phys;
331
332 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
333 phys = Pflag;
334 while ((ch = getopt(argc, argv, "LP")) != -1) {
335 switch (ch) {
336 case 'L':
337 phys = 0;
338 break;
339 case 'P':
340 phys = 1;
341 break;
342 default:
343 error("unknown option: -%c", optopt);
344 break;
345 }
346 }
347 argc -= optind;
348 argv += optind;
349
350 if (argc != 0)
351 error("too many arguments");
352
353 if (!phys && getpwd()) {
354 out1str(curdir);
355 out1c('\n');
356 } else {
99512ac4 357 if ((p = getpwd2()) == NULL)
984263bc 358 error(".: %s", strerror(errno));
99512ac4 359 out1str(p);
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360 out1c('\n');
361 }
362
363 return 0;
364}
365
366/*
99512ac4 367 * Get the current directory and cache the result in curdir.
984263bc 368 */
99512ac4 369static char *
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370getpwd(void)
371{
99512ac4 372 char *p;
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373
374 if (curdir)
375 return curdir;
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376
377 p = getpwd2();
378 if (p != NULL)
379 curdir = savestr(p);
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380
381 return curdir;
382}
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383
384#define MAXPWD 256
385
386/*
387 * Return the current directory.
388 */
389static char *
390getpwd2(void)
391{
392 char *pwd;
393 int i;
394
395 for (i = MAXPWD;; i *= 2) {
396 pwd = stalloc(i);
397 if (getcwd(pwd, i) != NULL)
398 return pwd;
399 stunalloc(pwd);
400 if (errno != ERANGE)
401 break;
402 }
403
404 return NULL;
405}
406
407/*
408 * Initialize PWD in a new shell.
409 * If the shell is interactive, we need to warn if this fails.
410 */
411void
412pwd_init(int warn)
413{
414 char *pwd;
415 struct stat stdot, stpwd;
416
417 pwd = lookupvar("PWD");
418 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
419 stat(pwd, &stpwd) != -1 &&
420 stdot.st_dev == stpwd.st_dev &&
421 stdot.st_ino == stpwd.st_ino) {
422 if (curdir)
423 ckfree(curdir);
424 curdir = savestr(pwd);
425 }
426 if (getpwd() == NULL && warn)
427 out2fmt_flush("sh: cannot determine working directory\n");
428 setvar("PWD", curdir, VEXPORT);
429}