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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
| 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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) 5/4/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
|
83 const char *path;
84 char *p;
85 struct stat statb;
86 int ch, phys, print = 0;
87
88 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
89 phys = Pflag;
90 while ((ch = getopt(argc, argv, "LP")) != -1) {
91 switch (ch) {
92 case 'L':
93 phys = 0;
94 break;
95 case 'P':
96 phys = 1;
97 break;
98 default:
99 error("unknown option: -%c", optopt);
100 break;
101 }
102 }
103 argc -= optind;
104 argv += optind;
105
106 if (argc > 1)
107 error("too many arguments");
108
109 if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
110 error("HOME not set");
111 if (*dest == '\0')
112 dest = ".";
113 if (dest[0] == '-' && dest[1] == '\0') {
114 dest = prevdir ? prevdir : curdir;
115 if (dest)
116 print = 1;
117 else
118 dest = ".";
119 }
120 if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
121 path = nullstr;
122 while ((p = padvance(&path, dest)) != NULL) {
123 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
124 if (!print) {
125 /*
126 * XXX - rethink
127 */
128 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
129 print = strcmp(p + 2, dest);
130 else
131 print = strcmp(p, dest);
132 }
133 if (docd(p, print, phys) >= 0)
134 return 0;
135 }
136 }
137 error("can't cd to %s", dest);
138 /*NOTREACHED*/
139 return 0;
140}
141
142
143/*
144 * Actually change the directory. In an interactive shell, print the
145 * directory name if "print" is nonzero.
146 */
147STATIC int
148docd(char *dest, int print, int phys)
149{
150
151 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
152
153 /* If logical cd fails, fall back to physical. */
154 if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
155 return (-1);
156
157 if (print && iflag && curdir)
158 out1fmt("%s\n", curdir);
159
160 return 0;
161}
162
163STATIC int
164cdlogical(char *dest)
165{
166 char *p;
167 char *q;
168 char *component;
169 struct stat statb;
170 int first;
171 int badstat;
172
173 /*
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.
177 */
178 badstat = 0;
179 cdcomppath = stalloc(strlen(dest) + 1);
180 scopy(dest, cdcomppath);
181 STARTSTACKSTR(p);
182 if (*dest == '/') {
183 STPUTC('/', p);
184 cdcomppath++;
185 }
186 first = 1;
187 while ((q = getcomponent()) != NULL) {
188 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
189 continue;
190 if (! first)
191 STPUTC('/', p);
192 first = 0;
193 component = q;
194 while (*q)
195 STPUTC(*q++, p);
196 if (equal(component, ".."))
197 continue;
198 STACKSTRNUL(p);
199 if (lstat(stackblock(), &statb) < 0) {
200 badstat = 1;
201 break;
202 }
203 }
204
205 INTOFF;
206 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
207 INTON;
208 return (-1);
209 }
210 updatepwd(p);
211 INTON;
212 return (0);
213}
214
215STATIC int
216cdphysical(char *dest)
217{
218 char *p;
219
220 INTOFF;
221 if (chdir(dest) < 0 || (p = findcwd(NULL)) == NULL) {
222 INTON;
223 return (-1);
224 }
225 updatepwd(p);
226 INTON;
227 return (0);
228}
229
230/*
231 * Get the next component of the path name pointed to by cdcomppath.
232 * This routine overwrites the string pointed to by cdcomppath.
233 */
234STATIC char *
235getcomponent(void)
236{
237 char *p;
238 char *start;
239
240 if ((p = cdcomppath) == NULL)
241 return NULL;
242 start = cdcomppath;
243 while (*p != '/' && *p != '\0')
244 p++;
245 if (*p == '\0') {
246 cdcomppath = NULL;
247 } else {
248 *p++ = '\0';
249 cdcomppath = p;
250 }
251 return start;
252}
253
254
255STATIC char *
256findcwd(char *dir)
257{
258 char *new;
259 char *p;
260
261 /*
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().
265 */
266 if (dir == NULL || curdir == NULL)
267 return getpwd2();
268 cdcomppath = stalloc(strlen(dir) + 1);
269 scopy(dir, cdcomppath);
270 STARTSTACKSTR(new);
271 if (*dir != '/') {
272 p = curdir;
273 while (*p)
274 STPUTC(*p++, new);
275 if (p[-1] == '/')
276 STUNPUTC(new);
277 }
278 while ((p = getcomponent()) != NULL) {
279 if (equal(p, "..")) {
280 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
281 } else if (*p != '\0' && ! equal(p, ".")) {
282 STPUTC('/', new);
283 while (*p)
284 STPUTC(*p++, new);
285 }
286 }
287 if (new == stackblock())
288 STPUTC('/', new);
289 STACKSTRNUL(new);
290 return stackblock();
291}
292
293/*
294 * Update curdir (the name of the current directory) in response to a
295 * cd command. We also call hashcd to let the routines in exec.c know
296 * that the current directory has changed.
297 */
298STATIC void
299updatepwd(char *dir)
300{
301 hashcd(); /* update command hash table */
302
303 if (prevdir)
304 ckfree(prevdir);
305 prevdir = curdir;
306 curdir = savestr(dir);
307 setvar("PWD", curdir, VEXPORT);
308 setvar("OLDPWD", prevdir, VEXPORT);
309}
310
311int
312pwdcmd(int argc, char **argv)
313{
314 char *p;
315 int ch, phys;
316
317 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
318 phys = Pflag;
319 while ((ch = getopt(argc, argv, "LP")) != -1) {
320 switch (ch) {
321 case 'L':
322 phys = 0;
323 break;
324 case 'P':
325 phys = 1;
326 break;
327 default:
328 error("unknown option: -%c", optopt);
329 break;
330 }
331 }
332 argc -= optind;
333 argv += optind;
334
335 if (argc != 0)
336 error("too many arguments");
337
338 if (!phys && getpwd()) {
339 out1str(curdir);
340 out1c('\n');
341 } else {
342 if ((p = getpwd2()) == NULL)
343 error(".: %s", strerror(errno));
344 out1str(p);
345 out1c('\n');
346 }
347
348 return 0;
349}
350
351/*
352 * Get the current directory and cache the result in curdir.
353 */
354char *
355getpwd(void)
356{
357 char *p;
358
359 if (curdir)
360 return curdir;
361
362 p = getpwd2();
363 if (p != NULL)
364 curdir = savestr(p);
365
366 return curdir;
367}
368
369#define MAXPWD 256
370
371/*
372 * Return the current directory.
373 */
374STATIC char *
375getpwd2(void)
376{
377 struct stat stdot, stpwd;
378 char *pwd;
379 int i;
380
381 for (i = MAXPWD;; i *= 2) {
382 pwd = stalloc(i);
383 if (getcwd(pwd, i) != NULL)
384 return pwd;
385 stunalloc(pwd);
386 if (errno != ERANGE)
387 break;
388 }
389
390 pwd = getenv("PWD");
391 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
392 stat(pwd, &stpwd) != -1 &&
393 stdot.st_dev == stpwd.st_dev &&
394 stdot.st_ino == stpwd.st_ino) {
395 return pwd;
396 }
397 return NULL;
398}
| 83 const char *path;
84 char *p;
85 struct stat statb;
86 int ch, phys, print = 0;
87
88 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
89 phys = Pflag;
90 while ((ch = getopt(argc, argv, "LP")) != -1) {
91 switch (ch) {
92 case 'L':
93 phys = 0;
94 break;
95 case 'P':
96 phys = 1;
97 break;
98 default:
99 error("unknown option: -%c", optopt);
100 break;
101 }
102 }
103 argc -= optind;
104 argv += optind;
105
106 if (argc > 1)
107 error("too many arguments");
108
109 if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
110 error("HOME not set");
111 if (*dest == '\0')
112 dest = ".";
113 if (dest[0] == '-' && dest[1] == '\0') {
114 dest = prevdir ? prevdir : curdir;
115 if (dest)
116 print = 1;
117 else
118 dest = ".";
119 }
120 if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL)
121 path = nullstr;
122 while ((p = padvance(&path, dest)) != NULL) {
123 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
124 if (!print) {
125 /*
126 * XXX - rethink
127 */
128 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
129 print = strcmp(p + 2, dest);
130 else
131 print = strcmp(p, dest);
132 }
133 if (docd(p, print, phys) >= 0)
134 return 0;
135 }
136 }
137 error("can't cd to %s", dest);
138 /*NOTREACHED*/
139 return 0;
140}
141
142
143/*
144 * Actually change the directory. In an interactive shell, print the
145 * directory name if "print" is nonzero.
146 */
147STATIC int
148docd(char *dest, int print, int phys)
149{
150
151 TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
152
153 /* If logical cd fails, fall back to physical. */
154 if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
155 return (-1);
156
157 if (print && iflag && curdir)
158 out1fmt("%s\n", curdir);
159
160 return 0;
161}
162
163STATIC int
164cdlogical(char *dest)
165{
166 char *p;
167 char *q;
168 char *component;
169 struct stat statb;
170 int first;
171 int badstat;
172
173 /*
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.
177 */
178 badstat = 0;
179 cdcomppath = stalloc(strlen(dest) + 1);
180 scopy(dest, cdcomppath);
181 STARTSTACKSTR(p);
182 if (*dest == '/') {
183 STPUTC('/', p);
184 cdcomppath++;
185 }
186 first = 1;
187 while ((q = getcomponent()) != NULL) {
188 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
189 continue;
190 if (! first)
191 STPUTC('/', p);
192 first = 0;
193 component = q;
194 while (*q)
195 STPUTC(*q++, p);
196 if (equal(component, ".."))
197 continue;
198 STACKSTRNUL(p);
199 if (lstat(stackblock(), &statb) < 0) {
200 badstat = 1;
201 break;
202 }
203 }
204
205 INTOFF;
206 if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
207 INTON;
208 return (-1);
209 }
210 updatepwd(p);
211 INTON;
212 return (0);
213}
214
215STATIC int
216cdphysical(char *dest)
217{
218 char *p;
219
220 INTOFF;
221 if (chdir(dest) < 0 || (p = findcwd(NULL)) == NULL) {
222 INTON;
223 return (-1);
224 }
225 updatepwd(p);
226 INTON;
227 return (0);
228}
229
230/*
231 * Get the next component of the path name pointed to by cdcomppath.
232 * This routine overwrites the string pointed to by cdcomppath.
233 */
234STATIC char *
235getcomponent(void)
236{
237 char *p;
238 char *start;
239
240 if ((p = cdcomppath) == NULL)
241 return NULL;
242 start = cdcomppath;
243 while (*p != '/' && *p != '\0')
244 p++;
245 if (*p == '\0') {
246 cdcomppath = NULL;
247 } else {
248 *p++ = '\0';
249 cdcomppath = p;
250 }
251 return start;
252}
253
254
255STATIC char *
256findcwd(char *dir)
257{
258 char *new;
259 char *p;
260
261 /*
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().
265 */
266 if (dir == NULL || curdir == NULL)
267 return getpwd2();
268 cdcomppath = stalloc(strlen(dir) + 1);
269 scopy(dir, cdcomppath);
270 STARTSTACKSTR(new);
271 if (*dir != '/') {
272 p = curdir;
273 while (*p)
274 STPUTC(*p++, new);
275 if (p[-1] == '/')
276 STUNPUTC(new);
277 }
278 while ((p = getcomponent()) != NULL) {
279 if (equal(p, "..")) {
280 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
281 } else if (*p != '\0' && ! equal(p, ".")) {
282 STPUTC('/', new);
283 while (*p)
284 STPUTC(*p++, new);
285 }
286 }
287 if (new == stackblock())
288 STPUTC('/', new);
289 STACKSTRNUL(new);
290 return stackblock();
291}
292
293/*
294 * Update curdir (the name of the current directory) in response to a
295 * cd command. We also call hashcd to let the routines in exec.c know
296 * that the current directory has changed.
297 */
298STATIC void
299updatepwd(char *dir)
300{
301 hashcd(); /* update command hash table */
302
303 if (prevdir)
304 ckfree(prevdir);
305 prevdir = curdir;
306 curdir = savestr(dir);
307 setvar("PWD", curdir, VEXPORT);
308 setvar("OLDPWD", prevdir, VEXPORT);
309}
310
311int
312pwdcmd(int argc, char **argv)
313{
314 char *p;
315 int ch, phys;
316
317 optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
318 phys = Pflag;
319 while ((ch = getopt(argc, argv, "LP")) != -1) {
320 switch (ch) {
321 case 'L':
322 phys = 0;
323 break;
324 case 'P':
325 phys = 1;
326 break;
327 default:
328 error("unknown option: -%c", optopt);
329 break;
330 }
331 }
332 argc -= optind;
333 argv += optind;
334
335 if (argc != 0)
336 error("too many arguments");
337
338 if (!phys && getpwd()) {
339 out1str(curdir);
340 out1c('\n');
341 } else {
342 if ((p = getpwd2()) == NULL)
343 error(".: %s", strerror(errno));
344 out1str(p);
345 out1c('\n');
346 }
347
348 return 0;
349}
350
351/*
352 * Get the current directory and cache the result in curdir.
353 */
354char *
355getpwd(void)
356{
357 char *p;
358
359 if (curdir)
360 return curdir;
361
362 p = getpwd2();
363 if (p != NULL)
364 curdir = savestr(p);
365
366 return curdir;
367}
368
369#define MAXPWD 256
370
371/*
372 * Return the current directory.
373 */
374STATIC char *
375getpwd2(void)
376{
377 struct stat stdot, stpwd;
378 char *pwd;
379 int i;
380
381 for (i = MAXPWD;; i *= 2) {
382 pwd = stalloc(i);
383 if (getcwd(pwd, i) != NULL)
384 return pwd;
385 stunalloc(pwd);
386 if (errno != ERANGE)
387 break;
388 }
389
390 pwd = getenv("PWD");
391 if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
392 stat(pwd, &stpwd) != -1 &&
393 stdot.st_dev == stpwd.st_dev &&
394 stdot.st_ino == stpwd.st_ino) {
395 return pwd;
396 }
397 return NULL;
398}
|