Commit | Line | Data |
---|---|---|
7d330afd BJ |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | #include "sh.h" | |
3 | ||
4 | /* | |
5 | * C shell | |
6 | */ | |
7 | ||
8 | #define ADDOP 1 | |
9 | #define MULOP 2 | |
10 | #define EQOP 4 | |
11 | #define RELOP 8 | |
12 | #define RESTOP 16 | |
13 | #define ANYOP 31 | |
14 | ||
15 | #define EQEQ 1 | |
16 | #define GTR 2 | |
17 | #define LSS 4 | |
18 | #define NOTEQ 6 | |
19 | ||
20 | exp(vp) | |
21 | register char ***vp; | |
22 | { | |
23 | ||
24 | return (exp0(vp, 0)); | |
25 | } | |
26 | ||
27 | exp0(vp, ignore) | |
28 | register char ***vp; | |
29 | bool ignore; | |
30 | { | |
31 | register int p1 = exp1(vp, ignore); | |
32 | ||
33 | #ifdef EDEBUG | |
34 | etraci("exp0 p1", p1, vp); | |
35 | #endif | |
36 | if (**vp && eq(**vp, "||")) { | |
37 | register int p2; | |
38 | ||
39 | (*vp)++; | |
40 | p2 = exp0(vp, ignore || p1); | |
41 | #ifdef EDEBUG | |
42 | etraci("exp0 p2", p2, vp); | |
43 | #endif | |
44 | return (p1 || p2); | |
45 | } | |
46 | return (p1); | |
47 | } | |
48 | ||
49 | exp1(vp, ignore) | |
50 | register char ***vp; | |
51 | { | |
52 | register int p1 = exp2(vp, ignore); | |
53 | ||
54 | #ifdef EDEBUG | |
55 | etraci("exp1 p1", p1, vp); | |
56 | #endif | |
57 | if (**vp && eq(**vp, "&&")) { | |
58 | register int p2; | |
59 | ||
60 | (*vp)++; | |
61 | p2 = exp1(vp, ignore || !p1); | |
62 | #ifdef EDEBUG | |
63 | etraci("exp1 p2", p2, vp); | |
64 | #endif | |
65 | return (p1 && p2); | |
66 | } | |
67 | return (p1); | |
68 | } | |
69 | ||
70 | exp2(vp, ignore) | |
71 | register char ***vp; | |
72 | bool ignore; | |
73 | { | |
74 | register int p1 = exp2a(vp, ignore); | |
75 | ||
76 | #ifdef EDEBUG | |
77 | etraci("exp3 p1", p1, vp); | |
78 | #endif | |
79 | if (**vp && eq(**vp, "|")) { | |
80 | register int p2; | |
81 | ||
82 | (*vp)++; | |
83 | p2 = exp2(vp, ignore); | |
84 | #ifdef EDEBUG | |
85 | etraci("exp3 p2", p2, vp); | |
86 | #endif | |
87 | return (p1 | p2); | |
88 | } | |
89 | return (p1); | |
90 | } | |
91 | ||
92 | exp2a(vp, ignore) | |
93 | register char ***vp; | |
94 | bool ignore; | |
95 | { | |
96 | register int p1 = exp2b(vp, ignore); | |
97 | ||
98 | #ifdef EDEBUG | |
99 | etraci("exp2a p1", p1, vp); | |
100 | #endif | |
101 | if (**vp && eq(**vp, "^")) { | |
102 | register int p2; | |
103 | ||
104 | (*vp)++; | |
105 | p2 = exp2a(vp, ignore); | |
106 | #ifdef EDEBUG | |
107 | etraci("exp2a p2", p2, vp); | |
108 | #endif | |
109 | return (p1 ^ p2); | |
110 | } | |
111 | return (p1); | |
112 | } | |
113 | ||
114 | exp2b(vp, ignore) | |
115 | register char ***vp; | |
116 | bool ignore; | |
117 | { | |
118 | register int p1 = exp2c(vp, ignore); | |
119 | ||
120 | #ifdef EDEBUG | |
121 | etraci("exp2b p1", p1, vp); | |
122 | #endif | |
123 | if (**vp && eq(**vp, "&")) { | |
124 | register int p2; | |
125 | ||
126 | (*vp)++; | |
127 | p2 = exp2b(vp, ignore); | |
128 | #ifdef EDEBUG | |
129 | etraci("exp2b p2", p2, vp); | |
130 | #endif | |
131 | return (p1 & p2); | |
132 | } | |
133 | return (p1); | |
134 | } | |
135 | ||
136 | exp2c(vp, ignore) | |
137 | register char ***vp; | |
138 | bool ignore; | |
139 | { | |
140 | register char *p1 = exp3(vp, ignore); | |
141 | register char *p2; | |
142 | register int i; | |
143 | ||
144 | #ifdef EDEBUG | |
145 | etracc("exp2c p1", p1, vp); | |
146 | #endif | |
147 | if (i = isa(**vp, EQOP)) { | |
148 | (*vp)++; | |
149 | p2 = exp3(vp, ignore); | |
150 | #ifdef EDEBUG | |
151 | etracc("exp2c p2", p2, vp); | |
152 | #endif | |
153 | if (!ignore) switch (i) { | |
154 | ||
155 | case EQEQ: | |
156 | i = eq(p1, p2); | |
157 | break; | |
158 | ||
159 | case NOTEQ: | |
160 | i = !eq(p1, p2); | |
161 | break; | |
162 | } | |
163 | xfree(p1), xfree(p2); | |
164 | return (i); | |
165 | } | |
166 | i = egetn(p1); | |
167 | xfree(p1); | |
168 | return (i); | |
169 | } | |
170 | ||
171 | char * | |
172 | exp3(vp, ignore) | |
173 | register char ***vp; | |
174 | bool ignore; | |
175 | { | |
176 | register char *p1, *p2; | |
177 | register int i; | |
178 | ||
179 | p1 = exp3a(vp, ignore); | |
180 | #ifdef EDEBUG | |
181 | etracc("exp3 p1", p1, vp); | |
182 | #endif | |
183 | if (i = isa(**vp, RELOP)) { | |
184 | (*vp)++; | |
185 | if (**vp && eq(**vp, "=")) | |
186 | i |= 1, (*vp)++; | |
187 | p2 = exp3(vp, ignore); | |
188 | #ifdef EDEBUG | |
189 | etracc("exp3 p2", p2, vp); | |
190 | #endif | |
191 | if (!ignore) switch (i) { | |
192 | ||
193 | case GTR: | |
194 | i = egetn(p1) > egetn(p2); | |
195 | break; | |
196 | ||
197 | case GTR|1: | |
198 | i = egetn(p1) >= egetn(p2); | |
199 | break; | |
200 | ||
201 | case LSS: | |
202 | i = egetn(p1) < egetn(p2); | |
203 | break; | |
204 | ||
205 | case LSS|1: | |
206 | i = egetn(p1) <= egetn(p2); | |
207 | break; | |
208 | } | |
209 | xfree(p1), xfree(p2); | |
210 | return (putn(i)); | |
211 | } | |
212 | return (p1); | |
213 | } | |
214 | ||
215 | char * | |
216 | exp3a(vp, ignore) | |
217 | register char ***vp; | |
218 | bool ignore; | |
219 | { | |
220 | register char *p1, *p2, *op; | |
221 | register int i; | |
222 | ||
223 | p1 = exp4(vp, ignore); | |
224 | #ifdef EDEBUG | |
225 | etracc("exp3a p1", p1, vp); | |
226 | #endif | |
227 | op = **vp; | |
228 | if (op && any(op[0], "<>") && op[0] == op[1]) { | |
229 | (*vp)++; | |
230 | p2 = exp3a(vp, ignore); | |
231 | #ifdef EDEBUG | |
232 | etracc("exp3a p2", p2, vp); | |
233 | #endif | |
234 | if (op[0] == '<') | |
235 | i = egetn(p1) << egetn(p2); | |
236 | else | |
237 | i = egetn(p1) >> egetn(p2); | |
238 | xfree(p1), xfree(p2); | |
239 | return (putn(i)); | |
240 | } | |
241 | return (p1); | |
242 | } | |
243 | ||
244 | char * | |
245 | exp4(vp, ignore) | |
246 | register char ***vp; | |
247 | bool ignore; | |
248 | { | |
249 | register char *p1, *p2; | |
250 | register int i = 0; | |
251 | ||
252 | p1 = exp5(vp, ignore); | |
253 | #ifdef EDEBUG | |
254 | etracc("exp4 p1", p1, vp); | |
255 | #endif | |
256 | if (isa(**vp, ADDOP)) { | |
257 | register char *op = *(*vp)++; | |
258 | ||
259 | p2 = exp4(vp, ignore); | |
260 | #ifdef EDEBUG | |
261 | etracc("exp4 p2", p2, vp); | |
262 | #endif | |
263 | if (!ignore) switch (op[0]) { | |
264 | ||
265 | case '+': | |
266 | i = egetn(p1) + egetn(p2); | |
267 | break; | |
268 | ||
269 | case '-': | |
270 | i = egetn(p1) - egetn(p2); | |
271 | break; | |
272 | } | |
273 | xfree(p1), xfree(p2); | |
274 | return (putn(i)); | |
275 | } | |
276 | return (p1); | |
277 | } | |
278 | ||
279 | char * | |
280 | exp5(vp, ignore) | |
281 | register char ***vp; | |
282 | bool ignore; | |
283 | { | |
284 | register char *p1, *p2; | |
285 | register int i = 0; | |
286 | ||
287 | p1 = exp6(vp, ignore); | |
288 | #ifdef EDEBUG | |
289 | etracc("exp5 p1", p1, vp); | |
290 | #endif | |
291 | if (isa(**vp, MULOP)) { | |
292 | register char *op = *(*vp)++; | |
293 | ||
294 | p2 = exp5(vp, ignore); | |
295 | #ifdef EDEBUG | |
296 | etracc("exp5 p2", p2, vp); | |
297 | #endif | |
298 | if (!ignore) switch (op[0]) { | |
299 | ||
300 | case '*': | |
301 | i = egetn(p1) * egetn(p2); | |
302 | break; | |
303 | ||
304 | case '/': | |
305 | i = egetn(p2); | |
306 | if (i == 0) | |
307 | error("Divide by 0"); | |
308 | i = egetn(p1) / i; | |
309 | break; | |
310 | ||
311 | case '%': | |
312 | i = egetn(p2); | |
313 | if (i == 0) | |
314 | error("Mod by 0"); | |
315 | i = egetn(p1) % i; | |
316 | break; | |
317 | } | |
318 | xfree(p1), xfree(p2); | |
319 | return (putn(i)); | |
320 | } | |
321 | return (p1); | |
322 | } | |
323 | ||
324 | char * | |
325 | exp6(vp, ignore) | |
326 | register char ***vp; | |
327 | { | |
328 | int ccode, i; | |
329 | register char *cp, *dp, *ep; | |
330 | ||
331 | if (eq(**vp, "!")) { | |
332 | (*vp)++; | |
333 | cp = exp6(vp, ignore); | |
334 | #ifdef EDEBUG | |
335 | etracc("exp6 ! cp", cp, vp); | |
336 | #endif | |
337 | i = egetn(cp); | |
338 | xfree(cp); | |
339 | return (putn(!i)); | |
340 | } | |
341 | if (eq(**vp, "~")) { | |
342 | (*vp)++; | |
343 | cp = exp6(vp, ignore); | |
344 | #ifdef EDEBUG | |
345 | etracc("exp6 ~ cp", cp, vp); | |
346 | #endif | |
347 | i = egetn(cp); | |
348 | xfree(cp); | |
349 | return (putn(~i)); | |
350 | } | |
351 | if (eq(**vp, "(")) { | |
352 | (*vp)++; | |
353 | ccode = exp0(vp, ignore); | |
354 | #ifdef EDEBUG | |
355 | etraci("exp6 () ccode", ccode, vp); | |
356 | #endif | |
357 | if (*vp == 0 || **vp == 0 || ***vp != ')') | |
358 | bferr("Expression syntax"); | |
359 | (*vp)++; | |
360 | return (putn(ccode)); | |
361 | } | |
362 | if (eq(**vp, "{")) { | |
363 | int pid; | |
364 | register char **v; | |
365 | ||
366 | (*vp)++; | |
367 | v = *vp; | |
368 | for (;;) { | |
369 | if (!**vp) | |
370 | bferr("Missing }"); | |
371 | if (eq(*(*vp)++, "}")) | |
372 | break; | |
373 | } | |
374 | if (ignore) | |
375 | return (""); | |
376 | pid = fork(); | |
377 | if (pid < 0) | |
378 | Perror("fork"); | |
379 | if (pid == 0) { | |
380 | if (setintr) | |
381 | signal(SIGINT, SIG_DFL); | |
382 | *--(*vp) = 0; | |
383 | evalav(v); | |
384 | exitstat(); | |
385 | } | |
386 | cadd(pid, "{}"); | |
387 | pwait(pid); | |
388 | #ifdef EDEBUG | |
389 | etraci("exp6 {} status", egetn(value("status")), vp); | |
390 | #endif | |
391 | return (putn(egetn(value("status")) == 0)); | |
392 | } | |
393 | if (isa(**vp, ANYOP)) | |
394 | return (""); | |
395 | cp = *(*vp)++; | |
396 | if (*cp == '-' && any(cp[1], "erwxfdzo")) { | |
397 | struct stat stb; | |
398 | ||
399 | if (isa(**vp, ANYOP)) | |
400 | bferr("Missing file name"); | |
401 | dp = *(*vp)++; | |
402 | if (ignore) | |
403 | return (""); | |
404 | ep = globone(dp); | |
405 | switch (cp[1]) { | |
406 | ||
407 | case 'r': | |
408 | i = !access(ep, 4); | |
409 | break; | |
410 | ||
411 | case 'w': | |
412 | i = !access(ep, 2); | |
413 | break; | |
414 | ||
415 | case 'x': | |
416 | i = !access(ep, 1); | |
417 | break; | |
418 | ||
419 | default: | |
420 | if (stat(ep, &stb)) { | |
421 | xfree(ep); | |
422 | return ("0"); | |
423 | } | |
424 | switch (cp[1]) { | |
425 | ||
426 | case 'f': | |
427 | i = (stb.st_mode & S_IFMT) == S_IFREG; | |
428 | break; | |
429 | ||
430 | case 'd': | |
431 | i = (stb.st_mode & S_IFMT) == S_IFDIR; | |
432 | break; | |
433 | ||
434 | case 'z': | |
435 | i = stb.st_size == 0; | |
436 | break; | |
437 | ||
438 | case 'e': | |
439 | i = 1; | |
440 | break; | |
441 | ||
442 | case 'o': | |
443 | i = stb.st_uid == uid; | |
444 | break; | |
445 | } | |
446 | } | |
447 | #ifdef EDEBUG | |
448 | etraci("exp6 -? i", i, vp); | |
449 | #endif | |
450 | xfree(ep); | |
451 | return (putn(i)); | |
452 | } | |
453 | #ifdef EDEBUG | |
454 | etracc("exp6 default", cp, vp); | |
455 | #endif | |
456 | return (globone(cp)); | |
457 | } | |
458 | ||
459 | evalav(v) | |
460 | register char **v; | |
461 | { | |
462 | struct wordent paraml; | |
463 | register struct wordent *hp = ¶ml; | |
464 | struct command *t; | |
465 | register struct wordent *wdp = hp; | |
466 | ||
467 | child++; | |
468 | set("status", "0"); | |
469 | hp->prev = hp->next = hp; | |
470 | hp->word = ""; | |
471 | while (*v) { | |
472 | register struct wordent *new = (struct wordent *) calloc(1, sizeof *wdp); | |
473 | ||
474 | new->prev = wdp; | |
475 | new->next = hp; | |
476 | wdp->next = new; | |
477 | wdp = new; | |
478 | wdp->word = savestr(*v++); | |
479 | } | |
480 | hp->prev = wdp; | |
481 | alias(¶ml); | |
482 | t = syntax(paraml.next, ¶ml); | |
483 | if (err) | |
484 | error(err); | |
485 | execute(t); | |
486 | freelex(¶ml), freesyn(t); | |
487 | } | |
488 | ||
489 | isa(cp, what) | |
490 | register char *cp; | |
491 | register int what; | |
492 | { | |
493 | ||
494 | if (cp == 0) | |
495 | return ((what & RESTOP) != 0); | |
496 | if (cp[1] == 0) { | |
497 | if ((what & ADDOP) && any(cp[0], "+-")) | |
498 | return (1); | |
499 | if ((what & MULOP) && any(cp[0], "*/%")) | |
500 | return (1); | |
501 | if ((what & RESTOP) && any(cp[0], "()!~^")) | |
502 | return (1); | |
503 | } | |
504 | if ((what & RESTOP) && (any(cp[0], "|&") || eq(cp, "<<") || eq(cp, ">>"))) | |
505 | return (1); | |
506 | if (what & EQOP) { | |
507 | if (eq(cp, "==")) | |
508 | return (EQEQ); | |
509 | if (eq(cp, "!=")) | |
510 | return (NOTEQ); | |
511 | } | |
512 | if (!(what & RELOP)) | |
513 | return (0); | |
514 | if (*cp == '<') | |
515 | return (LSS); | |
516 | if (*cp == '>') | |
517 | return (GTR); | |
518 | return (0); | |
519 | } | |
520 | ||
521 | egetn(cp) | |
522 | register char *cp; | |
523 | { | |
524 | ||
525 | if (*cp && *cp != '-' && !digit(*cp)) | |
526 | bferr("Expression syntax"); | |
527 | return (getn(cp)); | |
528 | } | |
529 | ||
530 | /* Phew! */ | |
531 | ||
532 | #ifdef EDEBUG | |
533 | etraci(str, i, vp) | |
534 | char *str; | |
535 | int i; | |
536 | char ***vp; | |
537 | { | |
538 | ||
539 | printf("%s=%d\t", str, i); | |
540 | blkpr(*vp); | |
541 | printf("\n"); | |
542 | } | |
543 | ||
544 | etracc(str, cp, vp) | |
545 | char *str, *cp; | |
546 | char ***vp; | |
547 | { | |
548 | ||
549 | printf("%s=%s\t", str, cp); | |
550 | blkpr(*vp); | |
551 | printf("\n"); | |
552 | } | |
553 | #endif |