Contents of /trunk/mkinitrd-magellan/klibc/usr/dash/parser.c
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
File MIME type: text/plain
File size: 32451 byte(s)
-updated to klibc-1.5.15
1 | /*- |
2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. |
4 | * Copyright (c) 1997-2005 |
5 | * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to Berkeley by |
8 | * Kenneth Almquist. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * 3. Neither the name of the University nor the names of its contributors |
19 | * may be used to endorse or promote products derived from this software |
20 | * without specific prior written permission. |
21 | * |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
32 | * SUCH DAMAGE. |
33 | */ |
34 | |
35 | #include <alloca.h> |
36 | #include <stdlib.h> |
37 | |
38 | #include "shell.h" |
39 | #include "parser.h" |
40 | #include "nodes.h" |
41 | #include "expand.h" /* defines rmescapes() */ |
42 | #include "exec.h" /* defines find_builtin() */ |
43 | #include "syntax.h" |
44 | #include "options.h" |
45 | #include "input.h" |
46 | #include "output.h" |
47 | #include "var.h" |
48 | #include "error.h" |
49 | #include "memalloc.h" |
50 | #include "mystring.h" |
51 | #include "alias.h" |
52 | #include "show.h" |
53 | #include "builtins.h" |
54 | #ifndef SMALL |
55 | #include "myhistedit.h" |
56 | #endif |
57 | |
58 | /* |
59 | * Shell command parser. |
60 | */ |
61 | |
62 | #define EOFMARKLEN 79 |
63 | |
64 | /* values returned by readtoken */ |
65 | #include "token.h" |
66 | |
67 | |
68 | |
69 | struct heredoc { |
70 | struct heredoc *next; /* next here document in list */ |
71 | union node *here; /* redirection node */ |
72 | char *eofmark; /* string indicating end of input */ |
73 | int striptabs; /* if set, strip leading tabs */ |
74 | }; |
75 | |
76 | |
77 | |
78 | struct heredoc *heredoclist; /* list of here documents to read */ |
79 | int doprompt; /* if set, prompt the user */ |
80 | int needprompt; /* true if interactive and at start of line */ |
81 | int lasttoken; /* last token read */ |
82 | MKINIT int tokpushback; /* last token pushed back */ |
83 | char *wordtext; /* text of last word returned by readtoken */ |
84 | int checkkwd; |
85 | struct nodelist *backquotelist; |
86 | union node *redirnode; |
87 | struct heredoc *heredoc; |
88 | int quoteflag; /* set if (part of) last token was quoted */ |
89 | int startlinno; /* line # where last token started */ |
90 | |
91 | |
92 | STATIC union node *list(int); |
93 | STATIC union node *andor(void); |
94 | STATIC union node *pipeline(void); |
95 | STATIC union node *command(void); |
96 | STATIC union node *simplecmd(void); |
97 | STATIC union node *makename(void); |
98 | STATIC void parsefname(void); |
99 | STATIC void parseheredoc(void); |
100 | STATIC int peektoken(void); |
101 | STATIC int readtoken(void); |
102 | STATIC int xxreadtoken(void); |
103 | STATIC int readtoken1(int, char const *, char *, int); |
104 | STATIC int noexpand(char *); |
105 | STATIC void synexpect(int) __attribute__((__noreturn__)); |
106 | STATIC void synerror(const char *) __attribute__((__noreturn__)); |
107 | STATIC void setprompt(int); |
108 | |
109 | |
110 | static inline int |
111 | isassignment(const char *p) |
112 | { |
113 | const char *q = endofname(p); |
114 | if (p == q) |
115 | return 0; |
116 | return *q == '='; |
117 | } |
118 | |
119 | |
120 | /* |
121 | * Read and parse a command. Returns NEOF on end of file. (NULL is a |
122 | * valid parse tree indicating a blank line.) |
123 | */ |
124 | |
125 | union node * |
126 | parsecmd(int interact) |
127 | { |
128 | int t; |
129 | |
130 | tokpushback = 0; |
131 | doprompt = interact; |
132 | if (doprompt) |
133 | setprompt(doprompt); |
134 | needprompt = 0; |
135 | t = readtoken(); |
136 | if (t == TEOF) |
137 | return NEOF; |
138 | if (t == TNL) |
139 | return NULL; |
140 | tokpushback++; |
141 | return list(1); |
142 | } |
143 | |
144 | |
145 | STATIC union node * |
146 | list(int nlflag) |
147 | { |
148 | union node *n1, *n2, *n3; |
149 | int tok; |
150 | |
151 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
152 | if (nlflag == 2 && tokendlist[peektoken()]) |
153 | return NULL; |
154 | n1 = NULL; |
155 | for (;;) { |
156 | n2 = andor(); |
157 | tok = readtoken(); |
158 | if (tok == TBACKGND) { |
159 | if (n2->type == NPIPE) { |
160 | n2->npipe.backgnd = 1; |
161 | } else { |
162 | if (n2->type != NREDIR) { |
163 | n3 = stalloc(sizeof(struct nredir)); |
164 | n3->nredir.n = n2; |
165 | n3->nredir.redirect = NULL; |
166 | n2 = n3; |
167 | } |
168 | n2->type = NBACKGND; |
169 | } |
170 | } |
171 | if (n1 == NULL) { |
172 | n1 = n2; |
173 | } |
174 | else { |
175 | n3 = (union node *)stalloc(sizeof (struct nbinary)); |
176 | n3->type = NSEMI; |
177 | n3->nbinary.ch1 = n1; |
178 | n3->nbinary.ch2 = n2; |
179 | n1 = n3; |
180 | } |
181 | switch (tok) { |
182 | case TBACKGND: |
183 | case TSEMI: |
184 | tok = readtoken(); |
185 | /* fall through */ |
186 | case TNL: |
187 | if (tok == TNL) { |
188 | parseheredoc(); |
189 | if (nlflag == 1) |
190 | return n1; |
191 | } else { |
192 | tokpushback++; |
193 | } |
194 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
195 | if (tokendlist[peektoken()]) |
196 | return n1; |
197 | break; |
198 | case TEOF: |
199 | if (heredoclist) |
200 | parseheredoc(); |
201 | else |
202 | pungetc(); /* push back EOF on input */ |
203 | return n1; |
204 | default: |
205 | if (nlflag == 1) |
206 | synexpect(-1); |
207 | tokpushback++; |
208 | return n1; |
209 | } |
210 | } |
211 | } |
212 | |
213 | |
214 | |
215 | STATIC union node * |
216 | andor(void) |
217 | { |
218 | union node *n1, *n2, *n3; |
219 | int t; |
220 | |
221 | n1 = pipeline(); |
222 | for (;;) { |
223 | if ((t = readtoken()) == TAND) { |
224 | t = NAND; |
225 | } else if (t == TOR) { |
226 | t = NOR; |
227 | } else { |
228 | tokpushback++; |
229 | return n1; |
230 | } |
231 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
232 | n2 = pipeline(); |
233 | n3 = (union node *)stalloc(sizeof (struct nbinary)); |
234 | n3->type = t; |
235 | n3->nbinary.ch1 = n1; |
236 | n3->nbinary.ch2 = n2; |
237 | n1 = n3; |
238 | } |
239 | } |
240 | |
241 | |
242 | |
243 | STATIC union node * |
244 | pipeline(void) |
245 | { |
246 | union node *n1, *n2, *pipenode; |
247 | struct nodelist *lp, *prev; |
248 | int negate; |
249 | |
250 | negate = 0; |
251 | TRACE(("pipeline: entered\n")); |
252 | if (readtoken() == TNOT) { |
253 | negate = !negate; |
254 | checkkwd = CHKKWD | CHKALIAS; |
255 | } else |
256 | tokpushback++; |
257 | n1 = command(); |
258 | if (readtoken() == TPIPE) { |
259 | pipenode = (union node *)stalloc(sizeof (struct npipe)); |
260 | pipenode->type = NPIPE; |
261 | pipenode->npipe.backgnd = 0; |
262 | lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); |
263 | pipenode->npipe.cmdlist = lp; |
264 | lp->n = n1; |
265 | do { |
266 | prev = lp; |
267 | lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); |
268 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
269 | lp->n = command(); |
270 | prev->next = lp; |
271 | } while (readtoken() == TPIPE); |
272 | lp->next = NULL; |
273 | n1 = pipenode; |
274 | } |
275 | tokpushback++; |
276 | if (negate) { |
277 | n2 = (union node *)stalloc(sizeof (struct nnot)); |
278 | n2->type = NNOT; |
279 | n2->nnot.com = n1; |
280 | return n2; |
281 | } else |
282 | return n1; |
283 | } |
284 | |
285 | |
286 | |
287 | STATIC union node * |
288 | command(void) |
289 | { |
290 | union node *n1, *n2; |
291 | union node *ap, **app; |
292 | union node *cp, **cpp; |
293 | union node *redir, **rpp; |
294 | union node **rpp2; |
295 | int t; |
296 | |
297 | redir = NULL; |
298 | rpp2 = &redir; |
299 | |
300 | switch (readtoken()) { |
301 | default: |
302 | synexpect(-1); |
303 | /* NOTREACHED */ |
304 | case TIF: |
305 | n1 = (union node *)stalloc(sizeof (struct nif)); |
306 | n1->type = NIF; |
307 | n1->nif.test = list(0); |
308 | if (readtoken() != TTHEN) |
309 | synexpect(TTHEN); |
310 | n1->nif.ifpart = list(0); |
311 | n2 = n1; |
312 | while (readtoken() == TELIF) { |
313 | n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); |
314 | n2 = n2->nif.elsepart; |
315 | n2->type = NIF; |
316 | n2->nif.test = list(0); |
317 | if (readtoken() != TTHEN) |
318 | synexpect(TTHEN); |
319 | n2->nif.ifpart = list(0); |
320 | } |
321 | if (lasttoken == TELSE) |
322 | n2->nif.elsepart = list(0); |
323 | else { |
324 | n2->nif.elsepart = NULL; |
325 | tokpushback++; |
326 | } |
327 | t = TFI; |
328 | break; |
329 | case TWHILE: |
330 | case TUNTIL: { |
331 | int got; |
332 | n1 = (union node *)stalloc(sizeof (struct nbinary)); |
333 | n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; |
334 | n1->nbinary.ch1 = list(0); |
335 | if ((got=readtoken()) != TDO) { |
336 | TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); |
337 | synexpect(TDO); |
338 | } |
339 | n1->nbinary.ch2 = list(0); |
340 | t = TDONE; |
341 | break; |
342 | } |
343 | case TFOR: |
344 | if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) |
345 | synerror("Bad for loop variable"); |
346 | n1 = (union node *)stalloc(sizeof (struct nfor)); |
347 | n1->type = NFOR; |
348 | n1->nfor.var = wordtext; |
349 | checkkwd = CHKKWD | CHKALIAS; |
350 | if (readtoken() == TIN) { |
351 | app = ≈ |
352 | while (readtoken() == TWORD) { |
353 | n2 = (union node *)stalloc(sizeof (struct narg)); |
354 | n2->type = NARG; |
355 | n2->narg.text = wordtext; |
356 | n2->narg.backquote = backquotelist; |
357 | *app = n2; |
358 | app = &n2->narg.next; |
359 | } |
360 | *app = NULL; |
361 | n1->nfor.args = ap; |
362 | if (lasttoken != TNL && lasttoken != TSEMI) |
363 | synexpect(-1); |
364 | } else { |
365 | n2 = (union node *)stalloc(sizeof (struct narg)); |
366 | n2->type = NARG; |
367 | n2->narg.text = (char *)dolatstr; |
368 | n2->narg.backquote = NULL; |
369 | n2->narg.next = NULL; |
370 | n1->nfor.args = n2; |
371 | /* |
372 | * Newline or semicolon here is optional (but note |
373 | * that the original Bourne shell only allowed NL). |
374 | */ |
375 | if (lasttoken != TNL && lasttoken != TSEMI) |
376 | tokpushback++; |
377 | } |
378 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
379 | if (readtoken() != TDO) |
380 | synexpect(TDO); |
381 | n1->nfor.body = list(0); |
382 | t = TDONE; |
383 | break; |
384 | case TCASE: |
385 | n1 = (union node *)stalloc(sizeof (struct ncase)); |
386 | n1->type = NCASE; |
387 | if (readtoken() != TWORD) |
388 | synexpect(TWORD); |
389 | n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); |
390 | n2->type = NARG; |
391 | n2->narg.text = wordtext; |
392 | n2->narg.backquote = backquotelist; |
393 | n2->narg.next = NULL; |
394 | do { |
395 | checkkwd = CHKKWD | CHKALIAS; |
396 | } while (readtoken() == TNL); |
397 | if (lasttoken != TIN) |
398 | synexpect(TIN); |
399 | cpp = &n1->ncase.cases; |
400 | next_case: |
401 | checkkwd = CHKNL | CHKKWD; |
402 | t = readtoken(); |
403 | while(t != TESAC) { |
404 | if (lasttoken == TLP) |
405 | readtoken(); |
406 | *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); |
407 | cp->type = NCLIST; |
408 | app = &cp->nclist.pattern; |
409 | for (;;) { |
410 | *app = ap = (union node *)stalloc(sizeof (struct narg)); |
411 | ap->type = NARG; |
412 | ap->narg.text = wordtext; |
413 | ap->narg.backquote = backquotelist; |
414 | if (readtoken() != TPIPE) |
415 | break; |
416 | app = &ap->narg.next; |
417 | readtoken(); |
418 | } |
419 | ap->narg.next = NULL; |
420 | if (lasttoken != TRP) |
421 | synexpect(TRP); |
422 | cp->nclist.body = list(2); |
423 | |
424 | cpp = &cp->nclist.next; |
425 | |
426 | checkkwd = CHKNL | CHKKWD; |
427 | if ((t = readtoken()) != TESAC) { |
428 | if (t != TENDCASE) |
429 | synexpect(TENDCASE); |
430 | else |
431 | goto next_case; |
432 | } |
433 | } |
434 | *cpp = NULL; |
435 | goto redir; |
436 | case TLP: |
437 | n1 = (union node *)stalloc(sizeof (struct nredir)); |
438 | n1->type = NSUBSHELL; |
439 | n1->nredir.n = list(0); |
440 | n1->nredir.redirect = NULL; |
441 | t = TRP; |
442 | break; |
443 | case TBEGIN: |
444 | n1 = list(0); |
445 | t = TEND; |
446 | break; |
447 | case TWORD: |
448 | case TREDIR: |
449 | tokpushback++; |
450 | return simplecmd(); |
451 | } |
452 | |
453 | if (readtoken() != t) |
454 | synexpect(t); |
455 | |
456 | redir: |
457 | /* Now check for redirection which may follow command */ |
458 | checkkwd = CHKKWD | CHKALIAS; |
459 | rpp = rpp2; |
460 | while (readtoken() == TREDIR) { |
461 | *rpp = n2 = redirnode; |
462 | rpp = &n2->nfile.next; |
463 | parsefname(); |
464 | } |
465 | tokpushback++; |
466 | *rpp = NULL; |
467 | if (redir) { |
468 | if (n1->type != NSUBSHELL) { |
469 | n2 = (union node *)stalloc(sizeof (struct nredir)); |
470 | n2->type = NREDIR; |
471 | n2->nredir.n = n1; |
472 | n1 = n2; |
473 | } |
474 | n1->nredir.redirect = redir; |
475 | } |
476 | |
477 | return n1; |
478 | } |
479 | |
480 | |
481 | STATIC union node * |
482 | simplecmd(void) { |
483 | union node *args, **app; |
484 | union node *n = NULL; |
485 | union node *vars, **vpp; |
486 | union node **rpp, *redir; |
487 | int savecheckkwd; |
488 | |
489 | args = NULL; |
490 | app = &args; |
491 | vars = NULL; |
492 | vpp = &vars; |
493 | redir = NULL; |
494 | rpp = &redir; |
495 | |
496 | savecheckkwd = CHKALIAS; |
497 | for (;;) { |
498 | checkkwd = savecheckkwd; |
499 | switch (readtoken()) { |
500 | case TWORD: |
501 | n = (union node *)stalloc(sizeof (struct narg)); |
502 | n->type = NARG; |
503 | n->narg.text = wordtext; |
504 | n->narg.backquote = backquotelist; |
505 | if (savecheckkwd && isassignment(wordtext)) { |
506 | *vpp = n; |
507 | vpp = &n->narg.next; |
508 | } else { |
509 | *app = n; |
510 | app = &n->narg.next; |
511 | savecheckkwd = 0; |
512 | } |
513 | break; |
514 | case TREDIR: |
515 | *rpp = n = redirnode; |
516 | rpp = &n->nfile.next; |
517 | parsefname(); /* read name of redirection file */ |
518 | break; |
519 | case TLP: |
520 | if ( |
521 | args && app == &args->narg.next && |
522 | !vars && !redir |
523 | ) { |
524 | struct builtincmd *bcmd; |
525 | const char *name; |
526 | |
527 | /* We have a function */ |
528 | if (readtoken() != TRP) |
529 | synexpect(TRP); |
530 | name = n->narg.text; |
531 | if ( |
532 | !goodname(name) || ( |
533 | (bcmd = find_builtin(name)) && |
534 | bcmd->flags & BUILTIN_SPECIAL |
535 | ) |
536 | ) |
537 | synerror("Bad function name"); |
538 | n->type = NDEFUN; |
539 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
540 | n->narg.next = command(); |
541 | return n; |
542 | } |
543 | /* fall through */ |
544 | default: |
545 | tokpushback++; |
546 | goto out; |
547 | } |
548 | } |
549 | out: |
550 | *app = NULL; |
551 | *vpp = NULL; |
552 | *rpp = NULL; |
553 | n = (union node *)stalloc(sizeof (struct ncmd)); |
554 | n->type = NCMD; |
555 | n->ncmd.args = args; |
556 | n->ncmd.assign = vars; |
557 | n->ncmd.redirect = redir; |
558 | return n; |
559 | } |
560 | |
561 | STATIC union node * |
562 | makename(void) |
563 | { |
564 | union node *n; |
565 | |
566 | n = (union node *)stalloc(sizeof (struct narg)); |
567 | n->type = NARG; |
568 | n->narg.next = NULL; |
569 | n->narg.text = wordtext; |
570 | n->narg.backquote = backquotelist; |
571 | return n; |
572 | } |
573 | |
574 | void fixredir(union node *n, const char *text, int err) |
575 | { |
576 | TRACE(("Fix redir %s %d\n", text, err)); |
577 | if (!err) |
578 | n->ndup.vname = NULL; |
579 | |
580 | if (is_digit(text[0]) && text[1] == '\0') |
581 | n->ndup.dupfd = digit_val(text[0]); |
582 | else if (text[0] == '-' && text[1] == '\0') |
583 | n->ndup.dupfd = -1; |
584 | else { |
585 | |
586 | if (err) |
587 | synerror("Bad fd number"); |
588 | else |
589 | n->ndup.vname = makename(); |
590 | } |
591 | } |
592 | |
593 | |
594 | STATIC void |
595 | parsefname(void) |
596 | { |
597 | union node *n = redirnode; |
598 | |
599 | if (readtoken() != TWORD) |
600 | synexpect(-1); |
601 | if (n->type == NHERE) { |
602 | struct heredoc *here = heredoc; |
603 | struct heredoc *p; |
604 | int i; |
605 | |
606 | if (quoteflag == 0) |
607 | n->type = NXHERE; |
608 | TRACE(("Here document %d\n", n->type)); |
609 | if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) |
610 | synerror("Illegal eof marker for << redirection"); |
611 | rmescapes(wordtext); |
612 | here->eofmark = wordtext; |
613 | here->next = NULL; |
614 | if (heredoclist == NULL) |
615 | heredoclist = here; |
616 | else { |
617 | for (p = heredoclist ; p->next ; p = p->next); |
618 | p->next = here; |
619 | } |
620 | } else if (n->type == NTOFD || n->type == NFROMFD) { |
621 | fixredir(n, wordtext, 0); |
622 | } else { |
623 | n->nfile.fname = makename(); |
624 | } |
625 | } |
626 | |
627 | |
628 | /* |
629 | * Input any here documents. |
630 | */ |
631 | |
632 | STATIC void |
633 | parseheredoc(void) |
634 | { |
635 | struct heredoc *here; |
636 | union node *n; |
637 | |
638 | here = heredoclist; |
639 | heredoclist = 0; |
640 | |
641 | while (here) { |
642 | if (needprompt) { |
643 | setprompt(2); |
644 | } |
645 | readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, |
646 | here->eofmark, here->striptabs); |
647 | n = (union node *)stalloc(sizeof (struct narg)); |
648 | n->narg.type = NARG; |
649 | n->narg.next = NULL; |
650 | n->narg.text = wordtext; |
651 | n->narg.backquote = backquotelist; |
652 | here->here->nhere.doc = n; |
653 | here = here->next; |
654 | } |
655 | } |
656 | |
657 | STATIC int |
658 | peektoken(void) |
659 | { |
660 | int t; |
661 | |
662 | t = readtoken(); |
663 | tokpushback++; |
664 | return (t); |
665 | } |
666 | |
667 | STATIC int |
668 | readtoken(void) |
669 | { |
670 | int t; |
671 | #ifdef DEBUG |
672 | int alreadyseen = tokpushback; |
673 | #endif |
674 | |
675 | top: |
676 | t = xxreadtoken(); |
677 | |
678 | /* |
679 | * eat newlines |
680 | */ |
681 | if (checkkwd & CHKNL) { |
682 | while (t == TNL) { |
683 | parseheredoc(); |
684 | t = xxreadtoken(); |
685 | } |
686 | } |
687 | |
688 | if (t != TWORD || quoteflag) { |
689 | goto out; |
690 | } |
691 | |
692 | /* |
693 | * check for keywords |
694 | */ |
695 | if (checkkwd & CHKKWD) { |
696 | const char *const *pp; |
697 | |
698 | if ((pp = findkwd(wordtext))) { |
699 | lasttoken = t = pp - parsekwd + KWDOFFSET; |
700 | TRACE(("keyword %s recognized\n", tokname[t])); |
701 | goto out; |
702 | } |
703 | } |
704 | |
705 | if (checkkwd & CHKALIAS) { |
706 | struct alias *ap; |
707 | if ((ap = lookupalias(wordtext, 1)) != NULL) { |
708 | if (*ap->val) { |
709 | pushstring(ap->val, ap); |
710 | } |
711 | goto top; |
712 | } |
713 | } |
714 | out: |
715 | checkkwd = 0; |
716 | #ifdef DEBUG |
717 | if (!alreadyseen) |
718 | TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); |
719 | else |
720 | TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); |
721 | #endif |
722 | return (t); |
723 | } |
724 | |
725 | |
726 | /* |
727 | * Read the next input token. |
728 | * If the token is a word, we set backquotelist to the list of cmds in |
729 | * backquotes. We set quoteflag to true if any part of the word was |
730 | * quoted. |
731 | * If the token is TREDIR, then we set redirnode to a structure containing |
732 | * the redirection. |
733 | * In all cases, the variable startlinno is set to the number of the line |
734 | * on which the token starts. |
735 | * |
736 | * [Change comment: here documents and internal procedures] |
737 | * [Readtoken shouldn't have any arguments. Perhaps we should make the |
738 | * word parsing code into a separate routine. In this case, readtoken |
739 | * doesn't need to have any internal procedures, but parseword does. |
740 | * We could also make parseoperator in essence the main routine, and |
741 | * have parseword (readtoken1?) handle both words and redirection.] |
742 | */ |
743 | |
744 | #define RETURN(token) return lasttoken = token |
745 | |
746 | STATIC int |
747 | xxreadtoken(void) |
748 | { |
749 | int c; |
750 | |
751 | if (tokpushback) { |
752 | tokpushback = 0; |
753 | return lasttoken; |
754 | } |
755 | if (needprompt) { |
756 | setprompt(2); |
757 | } |
758 | startlinno = plinno; |
759 | for (;;) { /* until token or start of word found */ |
760 | c = pgetc_macro(); |
761 | switch (c) { |
762 | case ' ': case '\t': |
763 | case PEOA: |
764 | continue; |
765 | case '#': |
766 | while ((c = pgetc()) != '\n' && c != PEOF); |
767 | pungetc(); |
768 | continue; |
769 | case '\\': |
770 | if (pgetc() == '\n') { |
771 | startlinno = ++plinno; |
772 | if (doprompt) |
773 | setprompt(2); |
774 | continue; |
775 | } |
776 | pungetc(); |
777 | goto breakloop; |
778 | case '\n': |
779 | plinno++; |
780 | needprompt = doprompt; |
781 | RETURN(TNL); |
782 | case PEOF: |
783 | RETURN(TEOF); |
784 | case '&': |
785 | if (pgetc() == '&') |
786 | RETURN(TAND); |
787 | pungetc(); |
788 | RETURN(TBACKGND); |
789 | case '|': |
790 | if (pgetc() == '|') |
791 | RETURN(TOR); |
792 | pungetc(); |
793 | RETURN(TPIPE); |
794 | case ';': |
795 | if (pgetc() == ';') |
796 | RETURN(TENDCASE); |
797 | pungetc(); |
798 | RETURN(TSEMI); |
799 | case '(': |
800 | RETURN(TLP); |
801 | case ')': |
802 | RETURN(TRP); |
803 | default: |
804 | goto breakloop; |
805 | } |
806 | } |
807 | breakloop: |
808 | return readtoken1(c, BASESYNTAX, (char *)NULL, 0); |
809 | #undef RETURN |
810 | } |
811 | |
812 | |
813 | |
814 | /* |
815 | * If eofmark is NULL, read a word or a redirection symbol. If eofmark |
816 | * is not NULL, read a here document. In the latter case, eofmark is the |
817 | * word which marks the end of the document and striptabs is true if |
818 | * leading tabs should be stripped from the document. The argument firstc |
819 | * is the first character of the input token or document. |
820 | * |
821 | * Because C does not have internal subroutines, I have simulated them |
822 | * using goto's to implement the subroutine linkage. The following macros |
823 | * will run code that appears at the end of readtoken1. |
824 | */ |
825 | |
826 | #define CHECKEND() {goto checkend; checkend_return:;} |
827 | #define PARSEREDIR() {goto parseredir; parseredir_return:;} |
828 | #define PARSESUB() {goto parsesub; parsesub_return:;} |
829 | #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} |
830 | #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} |
831 | #define PARSEARITH() {goto parsearith; parsearith_return:;} |
832 | |
833 | STATIC int |
834 | readtoken1(int firstc, char const *syntax, char *eofmark, int striptabs) |
835 | { |
836 | int c = firstc; |
837 | char *out; |
838 | int len; |
839 | char line[EOFMARKLEN + 1]; |
840 | struct nodelist *bqlist; |
841 | int quotef; |
842 | int dblquote; |
843 | int varnest; /* levels of variables expansion */ |
844 | int arinest; /* levels of arithmetic expansion */ |
845 | int parenlevel; /* levels of parens in arithmetic */ |
846 | int dqvarnest; /* levels of variables expansion within double quotes */ |
847 | int oldstyle; |
848 | char const *prevsyntax = NULL; /* syntax before arithmetic */ |
849 | |
850 | startlinno = plinno; |
851 | dblquote = 0; |
852 | if (syntax == DQSYNTAX) |
853 | dblquote = 1; |
854 | quotef = 0; |
855 | bqlist = NULL; |
856 | varnest = 0; |
857 | arinest = 0; |
858 | parenlevel = 0; |
859 | dqvarnest = 0; |
860 | |
861 | STARTSTACKSTR(out); |
862 | loop: { /* for each line, until end of word */ |
863 | #if ATTY |
864 | if (c == '\034' && doprompt |
865 | && attyset() && ! equal(termval(), "emacs")) { |
866 | attyline(); |
867 | if (syntax == BASESYNTAX) |
868 | return readtoken(); |
869 | c = pgetc(); |
870 | goto loop; |
871 | } |
872 | #endif |
873 | CHECKEND(); /* set c to PEOF if at end of here document */ |
874 | for (;;) { /* until end of line or end of word */ |
875 | CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ |
876 | switch(syntax[c]) { |
877 | case CNL: /* '\n' */ |
878 | if (syntax == BASESYNTAX) |
879 | goto endword; /* exit outer loop */ |
880 | USTPUTC(c, out); |
881 | plinno++; |
882 | if (doprompt) |
883 | setprompt(2); |
884 | c = pgetc(); |
885 | goto loop; /* continue outer loop */ |
886 | case CWORD: |
887 | USTPUTC(c, out); |
888 | break; |
889 | case CCTL: |
890 | if (eofmark == NULL || dblquote) |
891 | USTPUTC(CTLESC, out); |
892 | USTPUTC(c, out); |
893 | break; |
894 | case CBACK: /* backslash */ |
895 | c = pgetc2(); |
896 | if (c == PEOF) { |
897 | USTPUTC(CTLESC, out); |
898 | USTPUTC('\\', out); |
899 | pungetc(); |
900 | } else if (c == '\n') { |
901 | if (doprompt) |
902 | setprompt(2); |
903 | } else { |
904 | if ( |
905 | dblquote && |
906 | c != '\\' && c != '`' && |
907 | c != '$' && ( |
908 | c != '"' || |
909 | eofmark != NULL |
910 | ) |
911 | ) { |
912 | USTPUTC(CTLESC, out); |
913 | USTPUTC('\\', out); |
914 | } |
915 | if (SQSYNTAX[c] == CCTL) |
916 | USTPUTC(CTLESC, out); |
917 | USTPUTC(c, out); |
918 | quotef++; |
919 | } |
920 | break; |
921 | case CSQUOTE: |
922 | syntax = SQSYNTAX; |
923 | quotemark: |
924 | if (eofmark == NULL) { |
925 | USTPUTC(CTLQUOTEMARK, out); |
926 | } |
927 | break; |
928 | case CDQUOTE: |
929 | syntax = DQSYNTAX; |
930 | dblquote = 1; |
931 | goto quotemark; |
932 | case CENDQUOTE: |
933 | if (eofmark != NULL && arinest == 0 && |
934 | varnest == 0) { |
935 | USTPUTC(c, out); |
936 | } else { |
937 | if (dqvarnest == 0) { |
938 | syntax = BASESYNTAX; |
939 | dblquote = 0; |
940 | } |
941 | quotef++; |
942 | goto quotemark; |
943 | } |
944 | break; |
945 | case CVAR: /* '$' */ |
946 | PARSESUB(); /* parse substitution */ |
947 | break; |
948 | case CENDVAR: /* '}' */ |
949 | if (varnest > 0) { |
950 | varnest--; |
951 | if (dqvarnest > 0) { |
952 | dqvarnest--; |
953 | } |
954 | USTPUTC(CTLENDVAR, out); |
955 | } else { |
956 | USTPUTC(c, out); |
957 | } |
958 | break; |
959 | case CLP: /* '(' in arithmetic */ |
960 | parenlevel++; |
961 | USTPUTC(c, out); |
962 | break; |
963 | case CRP: /* ')' in arithmetic */ |
964 | if (parenlevel > 0) { |
965 | USTPUTC(c, out); |
966 | --parenlevel; |
967 | } else { |
968 | if (pgetc() == ')') { |
969 | if (--arinest == 0) { |
970 | USTPUTC(CTLENDARI, out); |
971 | syntax = prevsyntax; |
972 | if (syntax == DQSYNTAX) |
973 | dblquote = 1; |
974 | else |
975 | dblquote = 0; |
976 | } else |
977 | USTPUTC(')', out); |
978 | } else { |
979 | /* |
980 | * unbalanced parens |
981 | * (don't 2nd guess - no error) |
982 | */ |
983 | pungetc(); |
984 | USTPUTC(')', out); |
985 | } |
986 | } |
987 | break; |
988 | case CBQUOTE: /* '`' */ |
989 | PARSEBACKQOLD(); |
990 | break; |
991 | case CEOF: |
992 | goto endword; /* exit outer loop */ |
993 | case CIGN: |
994 | break; |
995 | default: |
996 | if (varnest == 0) |
997 | goto endword; /* exit outer loop */ |
998 | if (c != PEOA) { |
999 | USTPUTC(c, out); |
1000 | } |
1001 | } |
1002 | c = pgetc_macro(); |
1003 | } |
1004 | } |
1005 | endword: |
1006 | if (syntax == ARISYNTAX) |
1007 | synerror("Missing '))'"); |
1008 | if (syntax != BASESYNTAX && eofmark == NULL) |
1009 | synerror("Unterminated quoted string"); |
1010 | if (varnest != 0) { |
1011 | startlinno = plinno; |
1012 | /* { */ |
1013 | synerror("Missing '}'"); |
1014 | } |
1015 | USTPUTC('\0', out); |
1016 | len = out - (char *)stackblock(); |
1017 | out = stackblock(); |
1018 | if (eofmark == NULL) { |
1019 | if ((c == '>' || c == '<') |
1020 | && quotef == 0 |
1021 | && len <= 2 |
1022 | && (*out == '\0' || is_digit(*out))) { |
1023 | PARSEREDIR(); |
1024 | return lasttoken = TREDIR; |
1025 | } else { |
1026 | pungetc(); |
1027 | } |
1028 | } |
1029 | quoteflag = quotef; |
1030 | backquotelist = bqlist; |
1031 | grabstackblock(len); |
1032 | wordtext = out; |
1033 | return lasttoken = TWORD; |
1034 | /* end of readtoken routine */ |
1035 | |
1036 | |
1037 | |
1038 | /* |
1039 | * Check to see whether we are at the end of the here document. When this |
1040 | * is called, c is set to the first character of the next input line. If |
1041 | * we are at the end of the here document, this routine sets the c to PEOF. |
1042 | */ |
1043 | |
1044 | checkend: { |
1045 | if (eofmark) { |
1046 | if (c == PEOA) { |
1047 | c = pgetc2(); |
1048 | } |
1049 | if (striptabs) { |
1050 | while (c == '\t') { |
1051 | c = pgetc2(); |
1052 | } |
1053 | } |
1054 | if (c == *eofmark) { |
1055 | if (pfgets(line, sizeof line) != NULL) { |
1056 | char *p, *q; |
1057 | |
1058 | p = line; |
1059 | for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); |
1060 | if (*p == '\n' && *q == '\0') { |
1061 | c = PEOF; |
1062 | plinno++; |
1063 | needprompt = doprompt; |
1064 | } else { |
1065 | pushstring(line, NULL); |
1066 | } |
1067 | } |
1068 | } |
1069 | } |
1070 | goto checkend_return; |
1071 | } |
1072 | |
1073 | |
1074 | /* |
1075 | * Parse a redirection operator. The variable "out" points to a string |
1076 | * specifying the fd to be redirected. The variable "c" contains the |
1077 | * first character of the redirection operator. |
1078 | */ |
1079 | |
1080 | parseredir: { |
1081 | char fd = *out; |
1082 | union node *np; |
1083 | |
1084 | np = (union node *)stalloc(sizeof (struct nfile)); |
1085 | if (c == '>') { |
1086 | np->nfile.fd = 1; |
1087 | c = pgetc(); |
1088 | if (c == '>') |
1089 | np->type = NAPPEND; |
1090 | else if (c == '|') |
1091 | np->type = NCLOBBER; |
1092 | else if (c == '&') |
1093 | np->type = NTOFD; |
1094 | else { |
1095 | np->type = NTO; |
1096 | pungetc(); |
1097 | } |
1098 | } else { /* c == '<' */ |
1099 | np->nfile.fd = 0; |
1100 | switch (c = pgetc()) { |
1101 | case '<': |
1102 | if (sizeof (struct nfile) != sizeof (struct nhere)) { |
1103 | np = (union node *)stalloc(sizeof (struct nhere)); |
1104 | np->nfile.fd = 0; |
1105 | } |
1106 | np->type = NHERE; |
1107 | heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); |
1108 | heredoc->here = np; |
1109 | if ((c = pgetc()) == '-') { |
1110 | heredoc->striptabs = 1; |
1111 | } else { |
1112 | heredoc->striptabs = 0; |
1113 | pungetc(); |
1114 | } |
1115 | break; |
1116 | |
1117 | case '&': |
1118 | np->type = NFROMFD; |
1119 | break; |
1120 | |
1121 | case '>': |
1122 | np->type = NFROMTO; |
1123 | break; |
1124 | |
1125 | default: |
1126 | np->type = NFROM; |
1127 | pungetc(); |
1128 | break; |
1129 | } |
1130 | } |
1131 | if (fd != '\0') |
1132 | np->nfile.fd = digit_val(fd); |
1133 | redirnode = np; |
1134 | goto parseredir_return; |
1135 | } |
1136 | |
1137 | |
1138 | /* |
1139 | * Parse a substitution. At this point, we have read the dollar sign |
1140 | * and nothing else. |
1141 | */ |
1142 | |
1143 | parsesub: { |
1144 | int subtype; |
1145 | int typeloc; |
1146 | int flags; |
1147 | char *p; |
1148 | static const char types[] = "}-+?="; |
1149 | |
1150 | c = pgetc(); |
1151 | if ( |
1152 | c <= PEOA || |
1153 | (c != '(' && c != '{' && !is_name(c) && !is_special(c)) |
1154 | ) { |
1155 | USTPUTC('$', out); |
1156 | pungetc(); |
1157 | } else if (c == '(') { /* $(command) or $((arith)) */ |
1158 | if (pgetc() == '(') { |
1159 | PARSEARITH(); |
1160 | } else { |
1161 | pungetc(); |
1162 | PARSEBACKQNEW(); |
1163 | } |
1164 | } else { |
1165 | USTPUTC(CTLVAR, out); |
1166 | typeloc = out - (char *)stackblock(); |
1167 | USTPUTC(VSNORMAL, out); |
1168 | subtype = VSNORMAL; |
1169 | if (c == '{') { |
1170 | c = pgetc(); |
1171 | if (c == '#') { |
1172 | if ((c = pgetc()) == '}') |
1173 | c = '#'; |
1174 | else |
1175 | subtype = VSLENGTH; |
1176 | } |
1177 | else |
1178 | subtype = 0; |
1179 | } |
1180 | if (c > PEOA && is_name(c)) { |
1181 | do { |
1182 | STPUTC(c, out); |
1183 | c = pgetc(); |
1184 | } while (c > PEOA && is_in_name(c)); |
1185 | } else if (is_digit(c)) { |
1186 | do { |
1187 | STPUTC(c, out); |
1188 | c = pgetc(); |
1189 | } while (is_digit(c)); |
1190 | } |
1191 | else if (is_special(c)) { |
1192 | USTPUTC(c, out); |
1193 | c = pgetc(); |
1194 | } |
1195 | else |
1196 | badsub: synerror("Bad substitution"); |
1197 | |
1198 | STPUTC('=', out); |
1199 | flags = 0; |
1200 | if (subtype == 0) { |
1201 | switch (c) { |
1202 | case ':': |
1203 | flags = VSNUL; |
1204 | c = pgetc(); |
1205 | /*FALLTHROUGH*/ |
1206 | default: |
1207 | p = strchr(types, c); |
1208 | if (p == NULL) |
1209 | goto badsub; |
1210 | subtype = p - types + VSNORMAL; |
1211 | break; |
1212 | case '%': |
1213 | case '#': |
1214 | { |
1215 | int cc = c; |
1216 | subtype = c == '#' ? VSTRIMLEFT : |
1217 | VSTRIMRIGHT; |
1218 | c = pgetc(); |
1219 | if (c == cc) |
1220 | subtype++; |
1221 | else |
1222 | pungetc(); |
1223 | break; |
1224 | } |
1225 | } |
1226 | } else { |
1227 | pungetc(); |
1228 | } |
1229 | if (dblquote || arinest) |
1230 | flags |= VSQUOTE; |
1231 | *((char *)stackblock() + typeloc) = subtype | flags; |
1232 | if (subtype != VSNORMAL) { |
1233 | varnest++; |
1234 | if (dblquote || arinest) { |
1235 | dqvarnest++; |
1236 | } |
1237 | } |
1238 | } |
1239 | goto parsesub_return; |
1240 | } |
1241 | |
1242 | |
1243 | /* |
1244 | * Called to parse command substitutions. Newstyle is set if the command |
1245 | * is enclosed inside $(...); nlpp is a pointer to the head of the linked |
1246 | * list of commands (passed by reference), and savelen is the number of |
1247 | * characters on the top of the stack which must be preserved. |
1248 | */ |
1249 | |
1250 | parsebackq: { |
1251 | struct nodelist **nlpp; |
1252 | union node *n; |
1253 | char *str; |
1254 | size_t savelen; |
1255 | int saveprompt = 0; |
1256 | |
1257 | str = NULL; |
1258 | savelen = out - (char *)stackblock(); |
1259 | if (savelen > 0) { |
1260 | str = alloca(savelen); |
1261 | memcpy(str, stackblock(), savelen); |
1262 | } |
1263 | if (oldstyle) { |
1264 | /* We must read until the closing backquote, giving special |
1265 | treatment to some slashes, and then push the string and |
1266 | reread it as input, interpreting it normally. */ |
1267 | char *pout; |
1268 | int pc; |
1269 | size_t psavelen; |
1270 | char *pstr; |
1271 | |
1272 | |
1273 | STARTSTACKSTR(pout); |
1274 | for (;;) { |
1275 | if (needprompt) { |
1276 | setprompt(2); |
1277 | } |
1278 | switch (pc = pgetc()) { |
1279 | case '`': |
1280 | goto done; |
1281 | |
1282 | case '\\': |
1283 | if ((pc = pgetc()) == '\n') { |
1284 | plinno++; |
1285 | if (doprompt) |
1286 | setprompt(2); |
1287 | /* |
1288 | * If eating a newline, avoid putting |
1289 | * the newline into the new character |
1290 | * stream (via the STPUTC after the |
1291 | * switch). |
1292 | */ |
1293 | continue; |
1294 | } |
1295 | if (pc != '\\' && pc != '`' && pc != '$' |
1296 | && (!dblquote || pc != '"')) |
1297 | STPUTC('\\', pout); |
1298 | if (pc > PEOA) { |
1299 | break; |
1300 | } |
1301 | /* fall through */ |
1302 | |
1303 | case PEOF: |
1304 | case PEOA: |
1305 | startlinno = plinno; |
1306 | synerror("EOF in backquote substitution"); |
1307 | |
1308 | case '\n': |
1309 | plinno++; |
1310 | needprompt = doprompt; |
1311 | break; |
1312 | |
1313 | default: |
1314 | break; |
1315 | } |
1316 | STPUTC(pc, pout); |
1317 | } |
1318 | done: |
1319 | STPUTC('\0', pout); |
1320 | psavelen = pout - (char *)stackblock(); |
1321 | if (psavelen > 0) { |
1322 | pstr = grabstackstr(pout); |
1323 | setinputstring(pstr); |
1324 | } |
1325 | } |
1326 | nlpp = &bqlist; |
1327 | while (*nlpp) |
1328 | nlpp = &(*nlpp)->next; |
1329 | *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); |
1330 | (*nlpp)->next = NULL; |
1331 | |
1332 | if (oldstyle) { |
1333 | saveprompt = doprompt; |
1334 | doprompt = 0; |
1335 | } |
1336 | |
1337 | n = list(2); |
1338 | |
1339 | if (oldstyle) |
1340 | doprompt = saveprompt; |
1341 | else { |
1342 | if (readtoken() != TRP) |
1343 | synexpect(TRP); |
1344 | } |
1345 | |
1346 | (*nlpp)->n = n; |
1347 | if (oldstyle) { |
1348 | /* |
1349 | * Start reading from old file again, ignoring any pushed back |
1350 | * tokens left from the backquote parsing |
1351 | */ |
1352 | popfile(); |
1353 | tokpushback = 0; |
1354 | } |
1355 | while (stackblocksize() <= savelen) |
1356 | growstackblock(); |
1357 | STARTSTACKSTR(out); |
1358 | if (str) { |
1359 | memcpy(out, str, savelen); |
1360 | STADJUST(savelen, out); |
1361 | } |
1362 | if (arinest || dblquote) |
1363 | USTPUTC(CTLBACKQ | CTLQUOTE, out); |
1364 | else |
1365 | USTPUTC(CTLBACKQ, out); |
1366 | if (oldstyle) |
1367 | goto parsebackq_oldreturn; |
1368 | else |
1369 | goto parsebackq_newreturn; |
1370 | } |
1371 | |
1372 | /* |
1373 | * Parse an arithmetic expansion (indicate start of one and set state) |
1374 | */ |
1375 | parsearith: { |
1376 | |
1377 | if (++arinest == 1) { |
1378 | prevsyntax = syntax; |
1379 | syntax = ARISYNTAX; |
1380 | USTPUTC(CTLARI, out); |
1381 | if (dblquote) |
1382 | USTPUTC('"',out); |
1383 | else |
1384 | USTPUTC(' ',out); |
1385 | } else { |
1386 | /* |
1387 | * we collapse embedded arithmetic expansion to |
1388 | * parenthesis, which should be equivalent |
1389 | */ |
1390 | USTPUTC('(', out); |
1391 | } |
1392 | goto parsearith_return; |
1393 | } |
1394 | |
1395 | } /* end of readtoken */ |
1396 | |
1397 | |
1398 | |
1399 | #ifdef mkinit |
1400 | INCLUDE "parser.h" |
1401 | RESET { |
1402 | tokpushback = 0; |
1403 | checkkwd = 0; |
1404 | } |
1405 | #endif |
1406 | |
1407 | /* |
1408 | * Returns true if the text contains nothing to expand (no dollar signs |
1409 | * or backquotes). |
1410 | */ |
1411 | |
1412 | STATIC int |
1413 | noexpand(char *text) |
1414 | { |
1415 | char *p; |
1416 | signed char c; |
1417 | |
1418 | p = text; |
1419 | while ((c = *p++) != '\0') { |
1420 | if (c == CTLQUOTEMARK) |
1421 | continue; |
1422 | if (c == CTLESC) |
1423 | p++; |
1424 | else if (BASESYNTAX[(int)c] == CCTL) |
1425 | return 0; |
1426 | } |
1427 | return 1; |
1428 | } |
1429 | |
1430 | |
1431 | /* |
1432 | * Return of a legal variable name (a letter or underscore followed by zero or |
1433 | * more letters, underscores, and digits). |
1434 | */ |
1435 | |
1436 | char * |
1437 | endofname(const char *name) |
1438 | { |
1439 | char *p; |
1440 | |
1441 | p = (char *) name; |
1442 | if (! is_name(*p)) |
1443 | return p; |
1444 | while (*++p) { |
1445 | if (! is_in_name(*p)) |
1446 | break; |
1447 | } |
1448 | return p; |
1449 | } |
1450 | |
1451 | |
1452 | /* |
1453 | * Called when an unexpected token is read during the parse. The argument |
1454 | * is the token that is expected, or -1 if more than one type of token can |
1455 | * occur at this point. |
1456 | */ |
1457 | |
1458 | STATIC void |
1459 | synexpect(int token) |
1460 | { |
1461 | char msg[64]; |
1462 | |
1463 | if (token >= 0) { |
1464 | fmtstr(msg, 64, "%s unexpected (expecting %s)", |
1465 | tokname[lasttoken], tokname[token]); |
1466 | } else { |
1467 | fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); |
1468 | } |
1469 | synerror(msg); |
1470 | /* NOTREACHED */ |
1471 | } |
1472 | |
1473 | |
1474 | STATIC void |
1475 | synerror(const char *msg) |
1476 | { |
1477 | sh_error("Syntax error: %s", msg); |
1478 | /* NOTREACHED */ |
1479 | } |
1480 | |
1481 | STATIC void |
1482 | setprompt(int which) |
1483 | { |
1484 | struct stackmark smark; |
1485 | int show; |
1486 | |
1487 | needprompt = 0; |
1488 | whichprompt = which; |
1489 | |
1490 | #ifdef SMALL |
1491 | show = 1; |
1492 | #else |
1493 | show = !el; |
1494 | #endif |
1495 | if (show) { |
1496 | setstackmark(&smark); |
1497 | stalloc(stackblocksize()); |
1498 | out2str(getprompt(NULL)); |
1499 | popstackmark(&smark); |
1500 | } |
1501 | } |
1502 | |
1503 | const char * |
1504 | expandstr(const char *ps) |
1505 | { |
1506 | union node n; |
1507 | |
1508 | /* XXX Fix (char *) cast. */ |
1509 | setinputstring((char *)ps); |
1510 | readtoken1(pgetc(), DQSYNTAX, nullstr, 0); |
1511 | popfile(); |
1512 | |
1513 | n.narg.type = NARG; |
1514 | n.narg.next = NULL; |
1515 | n.narg.text = wordtext; |
1516 | n.narg.backquote = backquotelist; |
1517 | |
1518 | expandarg(&n, NULL, 0); |
1519 | return stackblock(); |
1520 | } |
1521 | |
1522 | /* |
1523 | * called by editline -- any expansions to the prompt |
1524 | * should be added here. |
1525 | */ |
1526 | const char * |
1527 | getprompt(void *unused) |
1528 | { |
1529 | const char *prompt; |
1530 | |
1531 | switch (whichprompt) { |
1532 | default: |
1533 | #ifdef DEBUG |
1534 | return "<internal prompt error>"; |
1535 | #endif |
1536 | case 0: |
1537 | return nullstr; |
1538 | case 1: |
1539 | prompt = ps1val(); |
1540 | break; |
1541 | case 2: |
1542 | prompt = ps2val(); |
1543 | break; |
1544 | } |
1545 | |
1546 | return expandstr(prompt); |
1547 | } |
1548 | |
1549 | const char *const * |
1550 | findkwd(const char *s) |
1551 | { |
1552 | return findstring( |
1553 | s, parsekwd, sizeof(parsekwd) / sizeof(const char *) |
1554 | ); |
1555 | } |