Commit | Line | Data |
---|---|---|
1a5078b8 BJ |
1 | #include "sh.h" |
2 | /* | |
3 | * Shell | |
4 | * | |
5 | * Modified by Bill Joy | |
6 | * UC Berkeley 1976/1977 | |
7 | * | |
8 | ||
9 | Features remaining to be fixed up and/or implemented | |
10 | ======== ========= == == ===== == === == =========== | |
11 | ||
12 | * Commands insert and delete on argument lists should be | |
13 | * implemented also set 3= when have 2 arguments should be | |
14 | * handled somehow (perhaps optionally valid). | |
15 | * Also note that $12 should really be done correctly. | |
16 | ||
17 | * A notion of terse ? | |
18 | ||
19 | * time time ... time time date etc. are funny | |
20 | * These should be implemented correctly with the internal versions | |
21 | * of exit repeat if goto etc. Probably want to maintain a timed | |
22 | * process number list and check this when processes die (this uses | |
23 | * less processes than forking a time). | |
24 | ||
25 | * Better facilities for string manipulation ? | |
26 | ||
27 | * The exit status variable should be implemented (status) | |
28 | * and set too by the internal commands. When do this get | |
29 | * rid of kludge about prompt not set for exit on error or | |
30 | * fix up in some way. Also should rewrite the argument | |
31 | * processing section to be cleaner and make some sense. | |
32 | ||
33 | * Do verbose more cleanly. | |
34 | ||
35 | * Implement next (recursively!) | |
36 | ||
37 | * Implement shell filters and <<. This probably involves some more | |
38 | * modularization of the scanner and deciphering of the two different | |
39 | * options available in the bell shell. | |
40 | ||
41 | * Other stuff from Bell shell - | |
42 | * | |
43 | * Any more control facilities ? | |
44 | * || && | |
45 | * <>, ><, >2, 2 >, etc. | |
46 | * Terminate | |
47 | * Can we build high level commands out of gotos which have | |
48 | * optional defaults and ifs that set variables which one | |
49 | * can test ? Think so ! | |
50 | * but what about "for" ? | |
51 | * Prompt for more input ? | |
52 | * Command substitution ` ` ? | |
53 | * Trap ? | |
54 | * Exec ? | |
55 | * Eval ? | |
56 | * .acct ? | |
57 | * Some way to set stdin to be input when filters can happen. | |
58 | ||
59 | * What about file name substitution and quoting in set. | |
60 | ||
61 | * Conditional expressions should be fixed up with set name@ | |
62 | * and to allow quoting at least between ? ... : ... }. | |
63 | ||
64 | * internal if, repeat, nohup, goto, exit, echo, echononl | |
65 | * Repeat, time, nohup, etc. should allow | |
66 | * | |
67 | * repeat 10 { sleep 5; echo hi } & | |
68 | * time { pc -l *.p ; obj } | |
69 | * or perhaps with ('s since that is illegal now anyways | |
70 | * although the above is more like if. | |
71 | ||
72 | * Changes to glob to allow ~, prevent too long path, and prevent | |
73 | * perhaps running out of directories. Also change it so it doesn't | |
74 | * exit so ungracefully, i.e. on: | |
75 | * chdir /asdf/adfas/a* | |
76 | * In error diagnostics the command name is often not set or set | |
77 | * wrong on calls to bferr. Could have more calls to bferr2. | |
78 | * Should be able to distinguish between ``No more processes'' and | |
79 | * ``Too many processes.'' | |
80 | ||
81 | * Shell flags to exit on error, make undefined variables an error. | |
82 | ||
83 | * Interrupted waits and errors in glob cost storage. | |
84 | * Scratch should go away. | |
85 | * Set a="abc" should print back similarly. | |
86 | ||
87 | * Last, but certainly not least, some of the INTERLISP redo etc features. | |
88 | ||
89 | */ | |
90 | ||
91 | char prompt[] "prompt"; | |
92 | char pcs[] "pcs"; | |
93 | char shell[] "shell"; | |
94 | char pid[] "pid"; | |
95 | char home[] "home"; | |
96 | char path[] "path"; | |
97 | char n_args[] "nargs"; | |
98 | char tim[] "time"; | |
99 | ||
100 | char *narginp, nonelflg, nverbose; | |
101 | ||
102 | main(c, av) | |
103 | int c; | |
104 | char **av; | |
105 | { | |
106 | register f; | |
107 | register char **v, *cp; | |
108 | ||
109 | settimes(); | |
110 | v = av; | |
111 | uid = getuid(); | |
112 | loginsh = **v == '-'; | |
113 | set(home, gethome() == 0 ? savestr(hentry.home) : "."); | |
114 | set1("0404", "/usr/bin/px", &interps); | |
115 | set(prompt, uid == 0 ? "#\240" : "\246\240"); | |
116 | set(shell, "/usr/bin/ashell"); | |
117 | set(pid, putn(getpid())); | |
118 | set1(tim, "tyme", &aliases); | |
119 | for (f = 3; f < 15; f++) | |
120 | close(f); | |
121 | if (c > 1) { | |
122 | if (*(cp = v[1]) == '-') { | |
123 | do | |
124 | switch (*cp++) { | |
125 | case 'V': | |
126 | verbose = 1; | |
127 | case 'v': | |
128 | nverbose = 1; | |
129 | break; | |
130 | case 'c': | |
131 | if (c > 2) | |
132 | narginp = v[2]; | |
133 | goto l1; | |
134 | case 't': | |
135 | nonelflg = 2; | |
136 | case '\0': | |
137 | l1: | |
138 | set(prompt, ""); | |
139 | unsetv(prompt); | |
140 | case 'i': | |
141 | **v = '-'; | |
142 | nofile++; | |
143 | break; | |
144 | } | |
145 | while (*cp); | |
146 | v++; | |
147 | c--; | |
148 | } | |
149 | if (nofile == 0 && c > 1) { | |
150 | set(prompt, ""); | |
151 | unsetv(prompt); | |
152 | close(0); | |
153 | if (open(cp = v[1], 0) < 0) { | |
154 | prs(v[1]); | |
155 | err(": Cannot open"); | |
156 | exit(1); | |
157 | } | |
158 | } | |
159 | } | |
160 | if (gtty(0, scratch) == 0 && gtty(1, scratch) == 0) | |
161 | **v = '-'; | |
162 | c--; | |
163 | v++; | |
164 | if (c == 0) { | |
165 | c = 1; | |
166 | v = av; | |
167 | } | |
168 | setargs(c, v); | |
169 | set(path, "-/bin-/usr/bin"); | |
170 | pfile("/.profile"); | |
171 | if (loginsh) | |
172 | pfile("/.login"); | |
173 | arginp = narginp; | |
174 | onelflg = nonelflg; | |
175 | verbose = nverbose; | |
176 | if (**av == '-') { | |
177 | setintr++; | |
178 | signal(QUIT, 1); | |
179 | signal(INTR, 1); | |
180 | } | |
181 | /* mask the name ?? */ | |
182 | process(1); | |
183 | if (loginsh) | |
184 | prs("logout\n"); | |
185 | goodbye(loginsh); | |
186 | } | |
187 | ||
188 | pfile(cp) | |
189 | char *cp; | |
190 | { | |
191 | int oldinput, c; | |
192 | ||
193 | strcpy(scratch, hentry.home); | |
194 | strcat(scratch, cp); | |
195 | oldinput = dup(0); | |
196 | close(0); | |
197 | c = open(scratch, 0); | |
198 | if (c == 0) { | |
199 | process(0); | |
200 | close(0); | |
201 | } | |
202 | dup(oldinput); | |
203 | close(oldinput); | |
204 | } | |
205 | ||
206 | goodbye(f) | |
207 | int f; | |
208 | { | |
209 | ||
210 | if (f) { | |
211 | signal(QUIT, 1); | |
212 | signal(INTR, 1); | |
213 | setintr = 0; | |
214 | pfile("/.logout"); | |
215 | } | |
216 | exit(0); | |
217 | } | |
218 | ||
219 | process(pro) | |
220 | { | |
221 | register char *cp; | |
222 | ||
223 | setexit(); | |
224 | if (doneinp) { | |
225 | doneinp = 0; | |
226 | return; | |
227 | } | |
228 | for (;;) { | |
229 | cp = value(prompt); | |
230 | if (pro) | |
231 | prs(cp); | |
232 | for (; *cp; cp++) | |
233 | echo(*cp); | |
234 | main1(); | |
235 | } | |
236 | } | |
237 | ||
238 | main1() | |
239 | { | |
240 | register int *t; | |
241 | ||
242 | error = 0; | |
243 | lex(¶ml); | |
244 | if (error) { | |
245 | err(error); | |
246 | freelex(¶ml); | |
247 | return; | |
248 | } | |
249 | t = syntax(paraml.next, ¶ml); | |
250 | if (error) | |
251 | err(error); | |
252 | else | |
253 | execute(t); | |
254 | freesyn(t); | |
255 | freelex(¶ml); | |
256 | } | |
257 | ||
258 | echo(c) | |
259 | char c; | |
260 | { | |
261 | ||
262 | c =& 0177; | |
263 | if (verbose) | |
264 | write(2, &c, 1); | |
265 | return (c); | |
266 | } | |
267 | ||
268 | err(s) | |
269 | char *s; | |
270 | { | |
271 | ||
272 | prs(s); | |
273 | prs("\n"); | |
274 | s = value(prompt); | |
275 | if (*s == 0) { | |
276 | seek(0, 0, 2); | |
277 | exit(1); | |
278 | } | |
279 | } | |
280 | ||
281 | prs(os) | |
282 | register char *os; | |
283 | { | |
284 | register char *s; | |
285 | ||
286 | s = os; | |
287 | if (s != 0) { | |
288 | while (*s) | |
289 | s++; | |
290 | write(2, os, s-os); | |
291 | } | |
292 | } | |
293 | ||
294 | digit(c) | |
295 | char c; | |
296 | { | |
297 | c =& 0177; | |
298 | return (c >= '0' && c <= '9'); | |
299 | } | |
300 | ||
301 | letter(c) | |
302 | char c; | |
303 | { | |
304 | c =& 0177; | |
305 | return (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z'); | |
306 | } | |
307 | ||
308 | any(c, s) | |
309 | int c; | |
310 | register char *s; | |
311 | { | |
312 | ||
313 | while (*s) | |
314 | if (*s++ == c) | |
315 | return(1); | |
316 | return(0); | |
317 | } | |
318 | ||
319 | char htmp[] "/etc/htmp"; | |
320 | int tty; | |
321 | ||
322 | gethome() | |
323 | { | |
324 | char buf[100]; | |
325 | register int i; | |
326 | register char *bufp, *cp; | |
327 | ||
328 | if (loginsh) | |
329 | exechome(); | |
330 | tty = ttyn(2); | |
331 | if (readhome() == 0 && hentry.uid == uid) | |
332 | return (0); | |
333 | if (getpw(uid, buf) && sleep(15), getpw(uid, buf)) | |
334 | return (-1); | |
335 | bufp = buf; | |
336 | for (i = 1; i < 6; i++) { | |
337 | while (*bufp != ':') | |
338 | if (*bufp++ == 0) | |
339 | return (-1); | |
340 | bufp++; | |
341 | } | |
342 | /* printf("buf %s bufp %s", buf, bufp); */ | |
343 | for (cp = bufp; *cp && *cp != ':'; cp++) | |
344 | continue; | |
345 | *cp = 0; | |
346 | /* printf("bufp %s\n", bufp); */ | |
347 | hentry.uid == uid; | |
348 | for (i = 0; i < (sizeof hentry.home - 1); i++) | |
349 | hentry.home[i] = *bufp ? *bufp++ : 0; | |
350 | return (0); | |
351 | } | |
352 | ||
353 | readhome() | |
354 | { | |
355 | int htmpf; | |
356 | ||
357 | htmpf = open(htmp, 0); | |
358 | if (htmpf < 0) | |
359 | return (-1); | |
360 | if (seek(htmpf, tty * sizeof hentry, 0) < 0) { | |
361 | close(htmpf); | |
362 | return (-1); | |
363 | } | |
364 | if (read(htmpf, &hentry, sizeof hentry) != sizeof hentry) { | |
365 | close(htmpf); | |
366 | return (-1); | |
367 | } | |
368 | close (htmpf); | |
369 | return (0); | |
370 | } | |
371 | ||
372 | exechome() | |
373 | { | |
374 | int status; | |
375 | static reenter; | |
376 | ||
377 | if (reenter) | |
378 | return; | |
379 | reenter = 1; | |
380 | /* | |
381 | if (fork()) { | |
382 | wait(&status); | |
383 | if (tty == 'x') | |
384 | tty = status >> 8; | |
385 | } else { | |
386 | execl("/usr/bin/sethome", loginsh ? "-" : "x", 0); | |
387 | exit(0177); | |
388 | } | |
389 | */ | |
390 | } | |
391 | ||
392 | getpw(uid, buf) | |
393 | int uid; | |
394 | char buf[]; | |
395 | { | |
396 | char pbuf[512]; | |
397 | register int n; | |
398 | register char *bp, *pbufp; | |
399 | int pwf, m, pbufc; | |
400 | ||
401 | pwf = open("/etc/passwd", 0); | |
402 | if (pwf < 0) | |
403 | return (1); | |
404 | pbufc = 0; | |
405 | for (;;) { | |
406 | bp = buf; | |
407 | do { | |
408 | if (pbufc == 0) { | |
409 | pbufc = read(pwf, &pbuf, 512); | |
410 | if (pbufc <= 0) | |
411 | return (1); | |
412 | pbufp = pbuf; | |
413 | } | |
414 | pbufc--; | |
415 | } while ((*bp++ = *pbufp++) != '\n'); | |
416 | *bp++ = '\0'; | |
417 | /* printf("uid %d xid %d buf %s", uid, xid(buf), buf); */ | |
418 | if (xid(buf) == uid) | |
419 | return (0); | |
420 | } | |
421 | } | |
422 | ||
423 | xid(buf) | |
424 | char buf[]; | |
425 | { | |
426 | register int i; | |
427 | int uid; | |
428 | register char *bp; | |
429 | register c; | |
430 | ||
431 | bp = buf; | |
432 | for (i = 1; i < 3; i++) { | |
433 | while (*bp != ':') | |
434 | if (*bp++ == 0) | |
435 | return (-1); | |
436 | bp++; | |
437 | } | |
438 | i = 0; | |
439 | while ((c = *bp++) != ':') | |
440 | if (c == 0) | |
441 | return (-1); | |
442 | else if (digit(c)) | |
443 | i = i * 10 + c - '0'; | |
444 | uid = i; | |
445 | i = 0; | |
446 | while ((c = *bp++) != ':') | |
447 | if (c == 0) | |
448 | return (-1); | |
449 | else if (digit(c)) | |
450 | i = i * 10 + c - '0'; | |
451 | return (i << 8 | uid); | |
452 | } |