Commit | Line | Data |
---|---|---|
106427f7 BJ |
1 | static char *sccsid = "@(#)dir.c 4.1 %G%"; |
2 | ||
3 | #include "sh.h" | |
4 | #include "sh.dir.h" | |
5 | ||
6 | /* | |
7 | * C Shell - directory management | |
8 | */ | |
9 | ||
10 | struct directory *dfind(); | |
11 | char *dfollow(); | |
12 | struct directory dhead; /* "head" of loop */ | |
13 | int printd; /* force name to be printed */ | |
14 | static char *fakev[] = { "dirs", NOSTR }; | |
15 | ||
16 | /* | |
17 | * dinit - initialize current working directory | |
18 | */ | |
19 | dinit(hp) | |
20 | char *hp; | |
21 | { | |
22 | register char *cp; | |
23 | register struct directory *dp; | |
24 | char path[BUFSIZ]; | |
25 | ||
26 | if (loginsh && hp) | |
27 | cp = hp; | |
28 | else | |
29 | cp = getwd(path); | |
30 | dp = (struct directory *)calloc(sizeof (struct directory), 1); | |
31 | dp->di_name = savestr(cp); | |
32 | dp->di_count = 0; | |
33 | dhead.di_next = dhead.di_prev = dp; | |
34 | dp->di_next = dp->di_prev = &dhead; | |
35 | printd = 0; | |
36 | dnewcwd(dp); | |
37 | } | |
38 | ||
39 | /* | |
40 | * dodirs - list all directories in directory loop | |
41 | */ | |
42 | dodirs(v) | |
43 | char **v; | |
44 | { | |
45 | register struct directory *dp; | |
46 | bool lflag; | |
47 | char *hp = value("home"); | |
48 | ||
49 | if (*hp == '\0') | |
50 | hp = NOSTR; | |
51 | if (*++v != NOSTR) | |
52 | if (eq(*v, "-l") && *++v == NOSTR) | |
53 | lflag = 1; | |
54 | else | |
55 | error("Usage: dirs [ -l ]"); | |
56 | else | |
57 | lflag = 0; | |
58 | dp = dcwd; | |
59 | do { | |
60 | if (dp == &dhead) | |
61 | continue; | |
62 | if (!lflag && hp != NOSTR) { | |
63 | dtildepr(hp, dp->di_name); | |
64 | } else | |
65 | printf("%s", dp->di_name); | |
66 | printf(" "); | |
67 | } while ((dp = dp->di_prev) != dcwd); | |
68 | printf("\n"); | |
69 | } | |
70 | ||
71 | dtildepr(home, dir) | |
72 | register char *home, *dir; | |
73 | { | |
74 | ||
75 | if (!eq(home, "/") && prefix(home, dir)) | |
76 | printf("~%s", dir + strlen(home)); | |
77 | else | |
78 | printf("%s", dir); | |
79 | } | |
80 | ||
81 | /* | |
82 | * dochngd - implement chdir command. | |
83 | */ | |
84 | dochngd(v) | |
85 | char **v; | |
86 | { | |
87 | register char *cp; | |
88 | register struct directory *dp; | |
89 | ||
90 | printd = 0; | |
91 | if (*++v == NOSTR) { | |
92 | if ((cp = value("home")) == NOSTR || *cp == 0) | |
93 | bferr("No home directory"); | |
94 | if (chdir(cp) < 0) | |
95 | bferr("Can't change to home directory"); | |
96 | cp = savestr(cp); | |
97 | } else if ((dp = dfind(*v)) != 0) { | |
98 | printd = 1; | |
99 | if (chdir(dp->di_name) < 0) | |
100 | Perror(dp->di_name); | |
101 | dcwd->di_prev->di_next = dcwd->di_next; | |
102 | dcwd->di_next->di_prev = dcwd->di_prev; | |
103 | goto flushcwd; | |
104 | } else | |
105 | cp = dfollow(*v); | |
106 | dp = (struct directory *)calloc(sizeof (struct directory), 1); | |
107 | dp->di_name = cp; | |
108 | dp->di_count = 0; | |
109 | dp->di_next = dcwd->di_next; | |
110 | dp->di_prev = dcwd->di_prev; | |
111 | dp->di_prev->di_next = dp; | |
112 | dp->di_next->di_prev = dp; | |
113 | flushcwd: | |
114 | dfree(dcwd); | |
115 | dnewcwd(dp); | |
116 | } | |
117 | ||
118 | /* | |
119 | * dfollow - change to arg directory; fall back on cdpath if not valid | |
120 | */ | |
121 | char * | |
122 | dfollow(cp) | |
123 | register char *cp; | |
124 | { | |
125 | register char **cdp; | |
126 | struct varent *c; | |
127 | ||
128 | cp = globone(cp); | |
129 | if (chdir(cp) == 0) | |
130 | goto gotcha; | |
131 | if (cp[0] != '/' && !prefix("./", cp) && !prefix("../", cp) | |
132 | && (c = adrof("cdpath"))) { | |
133 | for (cdp = c->vec; *cdp; cdp++) { | |
134 | char buf[BUFSIZ]; | |
135 | ||
136 | strcpy(buf, *cdp); | |
137 | strcat(buf, "/"); | |
138 | strcat(buf, cp); | |
139 | if (chdir(buf) >= 0) { | |
140 | printd = 1; | |
141 | xfree(cp); | |
142 | cp = savestr(buf); | |
143 | goto gotcha; | |
144 | } | |
145 | } | |
146 | } | |
147 | if (adrof(cp)) { | |
148 | char *dp = value(cp); | |
149 | ||
150 | if (dp[0] == '/' || dp[0] == '.') | |
151 | if (chdir(dp) >= 0) { | |
152 | xfree(cp); | |
153 | cp = savestr(dp); | |
154 | printd = 1; | |
155 | goto gotcha; | |
156 | } | |
157 | } | |
158 | xfree(cp); | |
159 | Perror(cp); | |
160 | ||
161 | gotcha: | |
162 | if (*cp != '/') { | |
163 | char *dp = calloc(strlen(cp) + strlen(dcwd->di_name) + 2, 1); | |
164 | strcpy(dp, dcwd->di_name); | |
165 | strcat(dp, "/"); | |
166 | strcat(dp, cp); | |
167 | xfree(cp); | |
168 | cp = dp; | |
169 | } | |
170 | dcanon(cp); | |
171 | return (cp); | |
172 | } | |
173 | ||
174 | /* | |
175 | * dopushd - push new directory onto directory stack. | |
176 | * with no arguments exchange top and second. | |
177 | * with numeric argument (+n) bring it to top. | |
178 | */ | |
179 | dopushd(v) | |
180 | char **v; | |
181 | { | |
182 | register struct directory *dp; | |
183 | ||
184 | printd = 1; | |
185 | if (*++v == NOSTR) { | |
186 | if ((dp = dcwd->di_prev) == &dhead) | |
187 | dp = dhead.di_prev; | |
188 | if (dp == dcwd) | |
189 | bferr("No other directory"); | |
190 | if (chdir(dp->di_name) < 0) | |
191 | Perror(dp->di_name); | |
192 | dp->di_prev->di_next = dp->di_next; | |
193 | dp->di_next->di_prev = dp->di_prev; | |
194 | dp->di_next = dcwd->di_next; | |
195 | dp->di_prev = dcwd; | |
196 | dcwd->di_next->di_prev = dp; | |
197 | dcwd->di_next = dp; | |
198 | } else if (dp = dfind(*v)) { | |
199 | if (chdir(dp->di_name) < 0) | |
200 | Perror(dp->di_name); | |
201 | } else { | |
202 | register char *cp; | |
203 | ||
204 | cp = dfollow(*v); | |
205 | dp = (struct directory *)calloc(sizeof (struct directory), 1); | |
206 | dp->di_name = cp; | |
207 | dp->di_count = 0; | |
208 | dp->di_prev = dcwd; | |
209 | dp->di_next = dcwd->di_next; | |
210 | dcwd->di_next = dp; | |
211 | dp->di_next->di_prev = dp; | |
212 | } | |
213 | dnewcwd(dp); | |
214 | } | |
215 | ||
216 | /* | |
217 | * dfind - find a directory if specified by numeric (+n) argument | |
218 | */ | |
219 | struct directory * | |
220 | dfind(cp) | |
221 | register char *cp; | |
222 | { | |
223 | register struct directory *dp; | |
224 | register int i; | |
225 | register char *ep; | |
226 | ||
227 | if (*cp++ != '+') | |
228 | return (0); | |
229 | for (ep = cp; digit(*ep); ep++) | |
230 | continue; | |
231 | if (*ep) | |
232 | return (0); | |
233 | i = getn(cp); | |
234 | if (i <= 0) | |
235 | return (0); | |
236 | for (dp = dcwd; i != 0; i--) { | |
237 | if ((dp = dp->di_prev) == &dhead) | |
238 | dp = dp->di_prev; | |
239 | if (dp == dcwd) | |
240 | bferr("Directory stack not that deep"); | |
241 | } | |
242 | return (dp); | |
243 | } | |
244 | ||
245 | /* | |
246 | * dopopd - pop a directory out of the directory stack | |
247 | * with a numeric argument just discard it. | |
248 | */ | |
249 | dopopd(v) | |
250 | char **v; | |
251 | { | |
252 | register struct directory *dp, *p; | |
253 | ||
254 | printd = 1; | |
255 | if (*++v == NOSTR) | |
256 | dp = dcwd; | |
257 | else if ((dp = dfind(*v)) == 0) | |
258 | bferr("Bad directory"); | |
259 | if (dp->di_prev == &dhead && dp->di_next == &dhead) | |
260 | bferr("Directory stack empty"); | |
261 | if (dp == dcwd) { | |
262 | if ((p = dp->di_prev) == &dhead) | |
263 | p = dhead.di_prev; | |
264 | if (chdir(p->di_name) < 0) | |
265 | Perror(p->di_name); | |
266 | } | |
267 | dp->di_prev->di_next = dp->di_next; | |
268 | dp->di_next->di_prev = dp->di_prev; | |
269 | if (dp == dcwd) | |
270 | dnewcwd(p); | |
271 | else | |
272 | dodirs(fakev); | |
273 | dfree(dp); | |
274 | } | |
275 | ||
276 | /* | |
277 | * dfree - free the directory (or keep it if it still has ref count) | |
278 | */ | |
279 | dfree(dp) | |
280 | register struct directory *dp; | |
281 | { | |
282 | ||
283 | if (dp->di_count != 0) | |
284 | dp->di_next = dp->di_prev = 0; | |
285 | else | |
286 | xfree(dp->di_name), xfree((char *)dp); | |
287 | } | |
288 | ||
289 | /* | |
290 | * dcanon - canonicalize the pathname, removing excess ./ and ../ etc. | |
291 | * we are of course assuming that the file system is standardly | |
292 | * constructed (always have ..'s, directories have links) | |
293 | */ | |
294 | dcanon(cp) | |
295 | char *cp; | |
296 | { | |
297 | register char *p, *sp; | |
298 | register bool slash; | |
299 | ||
300 | if (*cp != '/') | |
301 | abort(); | |
302 | for (p = cp; *p; ) { /* for each component */ | |
303 | sp = p; /* save slash address */ | |
304 | while(*++p == '/') /* flush extra slashes */ | |
305 | ; | |
306 | if (p != ++sp) | |
307 | strcpy(sp, p); | |
308 | p = sp; /* save start of component */ | |
309 | slash = 0; | |
310 | while(*++p) /* find next slash or end of path */ | |
311 | if (*p == '/') { | |
312 | slash = 1; | |
313 | *p = 0; | |
314 | break; | |
315 | } | |
316 | if (*sp == '\0') /* if component is null */ | |
317 | if (--sp == cp) /* if path is one char (i.e. /) */ | |
318 | break; | |
319 | else | |
320 | *sp = '\0'; | |
321 | else if (eq(".", sp)) { | |
322 | if (slash) { | |
323 | strcpy(sp, ++p); | |
324 | p = --sp; | |
325 | } else if (--sp != cp) | |
326 | *sp = '\0'; | |
327 | } else if (eq("..", sp)) { | |
328 | if (--sp != cp) | |
329 | while (*--sp != '/') | |
330 | ; | |
331 | if (slash) { | |
332 | strcpy(++sp, ++p); | |
333 | p = --sp; | |
334 | } else if (cp == sp) | |
335 | *++sp = '\0'; | |
336 | else | |
337 | *sp = '\0'; | |
338 | } else if (slash) | |
339 | *p = '/'; | |
340 | } | |
341 | } | |
342 | ||
343 | /* | |
344 | * dnewcwd - make a new directory in the loop the current one | |
345 | */ | |
346 | dnewcwd(dp) | |
347 | register struct directory *dp; | |
348 | { | |
349 | ||
350 | dcwd = dp; | |
351 | set("cwd", savestr(dcwd->di_name)); | |
352 | if (printd) | |
353 | dodirs(fakev); | |
354 | } |