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d003fee2 | 1 | /*- |
d1b73048 KB |
2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
d003fee2 KB |
4 | * |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Kenneth Almquist. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #ifndef lint | |
13b3e634 | 12 | static char sccsid[] = "@(#)cd.c 8.2 (Berkeley) %G%"; |
d003fee2 KB |
13 | #endif /* not lint */ |
14 | ||
13b3e634 CZ |
15 | #include <sys/types.h> |
16 | #include <sys/stat.h> | |
17 | #include <stdlib.h> | |
18 | #include <unistd.h> | |
19 | #include <errno.h> | |
20 | ||
d003fee2 KB |
21 | /* |
22 | * The cd and pwd commands. | |
23 | */ | |
24 | ||
25 | #include "shell.h" | |
26 | #include "var.h" | |
27 | #include "nodes.h" /* for jobs.h */ | |
28 | #include "jobs.h" | |
29 | #include "options.h" | |
30 | #include "output.h" | |
31 | #include "memalloc.h" | |
32 | #include "error.h" | |
13b3e634 | 33 | #include "redir.h" |
d003fee2 | 34 | #include "mystring.h" |
13b3e634 | 35 | #include "show.h" |
d003fee2 | 36 | |
13b3e634 CZ |
37 | STATIC int docd __P((char *, int)); |
38 | STATIC char *getcomponent __P((void)); | |
39 | STATIC void updatepwd __P((char *)); | |
40 | STATIC void getpwd __P((void)); | |
d003fee2 KB |
41 | |
42 | char *curdir; /* current working directory */ | |
af4f2a31 | 43 | char *prevdir; /* previous working directory */ |
d003fee2 KB |
44 | STATIC char *cdcomppath; |
45 | ||
d003fee2 | 46 | int |
13b3e634 CZ |
47 | cdcmd(argc, argv) |
48 | int argc; | |
49 | char **argv; | |
50 | { | |
d003fee2 KB |
51 | char *dest; |
52 | char *path; | |
53 | char *p; | |
54 | struct stat statb; | |
55 | char *padvance(); | |
af4f2a31 | 56 | int print = 0; |
d003fee2 | 57 | |
ddba57cd MT |
58 | nextopt(nullstr); |
59 | if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL) | |
d003fee2 | 60 | error("HOME not set"); |
af4f2a31 MT |
61 | if (dest[0] == '-' && dest[1] == '\0') { |
62 | dest = prevdir ? prevdir : curdir; | |
63 | print = 1; | |
64 | } | |
d003fee2 KB |
65 | if (*dest == '/' || (path = bltinlookup("CDPATH", 1)) == NULL) |
66 | path = nullstr; | |
67 | while ((p = padvance(&path, dest)) != NULL) { | |
13b3e634 | 68 | if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { |
af4f2a31 MT |
69 | if (!print) { |
70 | /* | |
71 | * XXX - rethink | |
72 | */ | |
73 | if (p[0] == '.' && p[1] == '/') | |
74 | p += 2; | |
75 | print = strcmp(p, dest); | |
76 | } | |
77 | if (docd(p, print) >= 0) | |
78 | return 0; | |
79 | ||
80 | } | |
d003fee2 KB |
81 | } |
82 | error("can't cd to %s", dest); | |
13b3e634 CZ |
83 | /*NOTREACHED*/ |
84 | return 0; | |
d003fee2 KB |
85 | } |
86 | ||
87 | ||
88 | /* | |
89 | * Actually do the chdir. If the name refers to symbolic links, we | |
90 | * compute the actual directory name before doing the cd. In an | |
91 | * interactive shell, print the directory name if "print" is nonzero | |
92 | * or if the name refers to a symbolic link. We also print the name | |
93 | * if "/u/logname" was expanded in it, since this is similar to a | |
94 | * symbolic link. (The check for this breaks if the user gives the | |
95 | * cd command some additional, unused arguments.) | |
96 | */ | |
97 | ||
98 | #if SYMLINKS == 0 | |
99 | STATIC int | |
100 | docd(dest, print) | |
101 | char *dest; | |
102 | { | |
d003fee2 KB |
103 | INTOFF; |
104 | if (chdir(dest) < 0) { | |
105 | INTON; | |
106 | return -1; | |
107 | } | |
108 | updatepwd(dest); | |
109 | INTON; | |
110 | if (print && iflag) | |
111 | out1fmt("%s\n", stackblock()); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | #else | |
116 | ||
117 | ||
118 | ||
119 | STATIC int | |
120 | docd(dest, print) | |
121 | char *dest; | |
13b3e634 CZ |
122 | int print; |
123 | { | |
d003fee2 KB |
124 | register char *p; |
125 | register char *q; | |
126 | char *symlink; | |
127 | char *component; | |
128 | struct stat statb; | |
129 | int first; | |
130 | int i; | |
131 | ||
132 | TRACE(("docd(\"%s\", %d) called\n", dest, print)); | |
d003fee2 KB |
133 | |
134 | top: | |
135 | cdcomppath = dest; | |
136 | STARTSTACKSTR(p); | |
137 | if (*dest == '/') { | |
138 | STPUTC('/', p); | |
139 | cdcomppath++; | |
140 | } | |
141 | first = 1; | |
142 | while ((q = getcomponent()) != NULL) { | |
13b3e634 | 143 | if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) |
d003fee2 KB |
144 | continue; |
145 | if (! first) | |
146 | STPUTC('/', p); | |
147 | first = 0; | |
148 | component = q; | |
149 | while (*q) | |
150 | STPUTC(*q++, p); | |
151 | if (equal(component, "..")) | |
152 | continue; | |
153 | STACKSTRNUL(p); | |
154 | if (lstat(stackblock(), &statb) < 0) | |
155 | error("lstat %s failed", stackblock()); | |
13b3e634 | 156 | if (!S_ISLNK(statb.st_mode)) |
d003fee2 KB |
157 | continue; |
158 | ||
159 | /* Hit a symbolic link. We have to start all over again. */ | |
160 | print = 1; | |
161 | STPUTC('\0', p); | |
162 | symlink = grabstackstr(p); | |
163 | i = (int)statb.st_size + 2; /* 2 for '/' and '\0' */ | |
164 | if (cdcomppath != NULL) | |
165 | i += strlen(cdcomppath); | |
166 | p = stalloc(i); | |
167 | if (readlink(symlink, p, (int)statb.st_size) < 0) { | |
168 | error("readlink %s failed", stackblock()); | |
169 | } | |
170 | if (cdcomppath != NULL) { | |
171 | p[(int)statb.st_size] = '/'; | |
172 | scopy(cdcomppath, p + (int)statb.st_size + 1); | |
173 | } else { | |
174 | p[(int)statb.st_size] = '\0'; | |
175 | } | |
176 | if (p[0] != '/') { /* relative path name */ | |
177 | char *r; | |
178 | q = r = symlink; | |
179 | while (*q) { | |
180 | if (*q++ == '/') | |
181 | r = q; | |
182 | } | |
183 | *r = '\0'; | |
184 | dest = stalloc(strlen(symlink) + strlen(p) + 1); | |
185 | scopy(symlink, dest); | |
186 | strcat(dest, p); | |
187 | } else { | |
188 | dest = p; | |
189 | } | |
190 | goto top; | |
191 | } | |
192 | STPUTC('\0', p); | |
193 | p = grabstackstr(p); | |
194 | INTOFF; | |
195 | if (chdir(p) < 0) { | |
196 | INTON; | |
197 | return -1; | |
198 | } | |
199 | updatepwd(p); | |
200 | INTON; | |
201 | if (print && iflag) | |
202 | out1fmt("%s\n", p); | |
203 | return 0; | |
204 | } | |
205 | #endif /* SYMLINKS */ | |
206 | ||
207 | ||
208 | ||
209 | /* | |
210 | * Get the next component of the path name pointed to by cdcomppath. | |
211 | * This routine overwrites the string pointed to by cdcomppath. | |
212 | */ | |
213 | ||
214 | STATIC char * | |
215 | getcomponent() { | |
216 | register char *p; | |
217 | char *start; | |
218 | ||
219 | if ((p = cdcomppath) == NULL) | |
220 | return NULL; | |
221 | start = cdcomppath; | |
222 | while (*p != '/' && *p != '\0') | |
223 | p++; | |
224 | if (*p == '\0') { | |
225 | cdcomppath = NULL; | |
226 | } else { | |
227 | *p++ = '\0'; | |
228 | cdcomppath = p; | |
229 | } | |
230 | return start; | |
231 | } | |
232 | ||
233 | ||
234 | ||
235 | /* | |
236 | * Update curdir (the name of the current directory) in response to a | |
237 | * cd command. We also call hashcd to let the routines in exec.c know | |
238 | * that the current directory has changed. | |
239 | */ | |
240 | ||
241 | void hashcd(); | |
242 | ||
243 | STATIC void | |
244 | updatepwd(dir) | |
245 | char *dir; | |
246 | { | |
247 | char *new; | |
248 | char *p; | |
249 | ||
250 | hashcd(); /* update command hash table */ | |
251 | cdcomppath = stalloc(strlen(dir) + 1); | |
252 | scopy(dir, cdcomppath); | |
253 | STARTSTACKSTR(new); | |
254 | if (*dir != '/') { | |
255 | if (curdir == NULL) | |
256 | return; | |
257 | p = curdir; | |
258 | while (*p) | |
259 | STPUTC(*p++, new); | |
260 | if (p[-1] == '/') | |
261 | STUNPUTC(new); | |
262 | } | |
263 | while ((p = getcomponent()) != NULL) { | |
264 | if (equal(p, "..")) { | |
265 | while (new > stackblock() && (STUNPUTC(new), *new) != '/'); | |
266 | } else if (*p != '\0' && ! equal(p, ".")) { | |
267 | STPUTC('/', new); | |
268 | while (*p) | |
269 | STPUTC(*p++, new); | |
270 | } | |
271 | } | |
272 | if (new == stackblock()) | |
273 | STPUTC('/', new); | |
274 | STACKSTRNUL(new); | |
af4f2a31 MT |
275 | INTOFF; |
276 | if (prevdir) | |
277 | ckfree(prevdir); | |
278 | prevdir = curdir; | |
d003fee2 | 279 | curdir = savestr(stackblock()); |
af4f2a31 | 280 | INTON; |
d003fee2 KB |
281 | } |
282 | ||
283 | ||
284 | ||
285 | int | |
13b3e634 CZ |
286 | pwdcmd(argc, argv) |
287 | int argc; | |
288 | char **argv; | |
289 | { | |
d003fee2 KB |
290 | getpwd(); |
291 | out1str(curdir); | |
292 | out1c('\n'); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | ||
297 | ||
298 | /* | |
299 | * Run /bin/pwd to find out what the current directory is. We suppress | |
300 | * interrupts throughout most of this, but the user can still break out | |
301 | * of it by killing the pwd program. If we already know the current | |
302 | * directory, this routine returns immediately. | |
303 | */ | |
304 | ||
305 | #define MAXPWD 256 | |
306 | ||
307 | STATIC void | |
308 | getpwd() { | |
309 | char buf[MAXPWD]; | |
310 | char *p; | |
311 | int i; | |
312 | int status; | |
313 | struct job *jp; | |
314 | int pip[2]; | |
315 | ||
316 | if (curdir) | |
317 | return; | |
318 | INTOFF; | |
319 | if (pipe(pip) < 0) | |
320 | error("Pipe call failed"); | |
321 | jp = makejob((union node *)NULL, 1); | |
322 | if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) { | |
323 | close(pip[0]); | |
324 | if (pip[1] != 1) { | |
325 | close(1); | |
326 | copyfd(pip[1], 1); | |
327 | close(pip[1]); | |
328 | } | |
329 | execl("/bin/pwd", "pwd", (char *)0); | |
330 | error("Cannot exec /bin/pwd"); | |
331 | } | |
332 | close(pip[1]); | |
333 | pip[1] = -1; | |
334 | p = buf; | |
335 | while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0 | |
13b3e634 | 336 | || (i == -1 && errno == EINTR)) { |
d003fee2 KB |
337 | if (i > 0) |
338 | p += i; | |
339 | } | |
340 | close(pip[0]); | |
341 | pip[0] = -1; | |
342 | status = waitforjob(jp); | |
343 | if (status != 0) | |
344 | error((char *)0); | |
345 | if (i < 0 || p == buf || p[-1] != '\n') | |
346 | error("pwd command failed"); | |
347 | p[-1] = '\0'; | |
348 | curdir = savestr(buf); | |
349 | INTON; | |
350 | } |