Commit | Line | Data |
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d787dbb5 | 1 | /*- |
d1b73048 KB |
2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
d787dbb5 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 | |
d1b73048 | 12 | static char sccsid[] = "@(#)parser.c 8.1 (Berkeley) %G%"; |
d787dbb5 KB |
13 | #endif /* not lint */ |
14 | ||
15 | #include "shell.h" | |
16 | #include "parser.h" | |
17 | #include "nodes.h" | |
18 | #include "expand.h" /* defines rmescapes() */ | |
19 | #include "redir.h" /* defines copyfd() */ | |
20 | #include "syntax.h" | |
21 | #include "options.h" | |
22 | #include "input.h" | |
23 | #include "output.h" | |
24 | #include "var.h" | |
25 | #include "error.h" | |
26 | #include "memalloc.h" | |
27 | #include "mystring.h" | |
2458cbee | 28 | #include "alias.h" |
fa73a0ba | 29 | #include "myhistedit.h" |
d787dbb5 KB |
30 | |
31 | ||
32 | /* | |
33 | * Shell command parser. | |
34 | */ | |
35 | ||
36 | #define EOFMARKLEN 79 | |
37 | ||
38 | /* values returned by readtoken */ | |
39 | #include "token.def" | |
40 | ||
41 | ||
42 | ||
43 | struct heredoc { | |
44 | struct heredoc *next; /* next here document in list */ | |
45 | union node *here; /* redirection node */ | |
46 | char *eofmark; /* string indicating end of input */ | |
47 | int striptabs; /* if set, strip leading tabs */ | |
48 | }; | |
49 | ||
50 | ||
51 | ||
52 | struct heredoc *heredoclist; /* list of here documents to read */ | |
53 | int parsebackquote; /* nonzero if we are inside backquotes */ | |
54 | int doprompt; /* if set, prompt the user */ | |
55 | int needprompt; /* true if interactive and at start of line */ | |
56 | int lasttoken; /* last token read */ | |
57 | MKINIT int tokpushback; /* last token pushed back */ | |
58 | char *wordtext; /* text of last word returned by readtoken */ | |
2458cbee | 59 | MKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ |
d787dbb5 KB |
60 | struct nodelist *backquotelist; |
61 | union node *redirnode; | |
62 | struct heredoc *heredoc; | |
63 | int quoteflag; /* set if (part of) last token was quoted */ | |
64 | int startlinno; /* line # where last token started */ | |
65 | ||
66 | ||
67 | #define GDB_HACK 1 /* avoid local declarations which gdb can't handle */ | |
68 | #ifdef GDB_HACK | |
69 | static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'}; | |
70 | static const char types[] = "}-+?="; | |
71 | #endif | |
72 | ||
73 | ||
21679e1e MT |
74 | STATIC union node *list __P((int)); |
75 | STATIC union node *andor __P((void)); | |
76 | STATIC union node *pipeline __P((void)); | |
77 | STATIC union node *command __P((void)); | |
ddc16cae | 78 | STATIC union node *simplecmd __P((union node **, union node *)); |
21679e1e MT |
79 | STATIC void parsefname __P((void)); |
80 | STATIC void parseheredoc __P((void)); | |
81 | STATIC int readtoken __P((void)); | |
82 | STATIC int readtoken1 __P((int, char const *, char *, int)); | |
83 | STATIC void attyline __P((void)); | |
84 | STATIC int noexpand __P((char *)); | |
85 | STATIC void synexpect __P((int)); | |
86 | STATIC void synerror __P((char *)); | |
2458cbee | 87 | STATIC void setprompt __P((int)); |
d787dbb5 KB |
88 | |
89 | /* | |
90 | * Read and parse a command. Returns NEOF on end of file. (NULL is a | |
91 | * valid parse tree indicating a blank line.) | |
92 | */ | |
93 | ||
94 | union node * | |
95 | parsecmd(interact) { | |
96 | int t; | |
97 | ||
98 | doprompt = interact; | |
99 | if (doprompt) | |
2458cbee MT |
100 | setprompt(1); |
101 | else | |
102 | setprompt(0); | |
d787dbb5 | 103 | needprompt = 0; |
2458cbee MT |
104 | t = readtoken(); |
105 | if (t == TEOF) | |
d787dbb5 KB |
106 | return NEOF; |
107 | if (t == TNL) | |
108 | return NULL; | |
109 | tokpushback++; | |
110 | return list(1); | |
111 | } | |
112 | ||
113 | ||
114 | STATIC union node * | |
115 | list(nlflag) { | |
116 | union node *n1, *n2, *n3; | |
117 | ||
21679e1e MT |
118 | checkkwd = 2; |
119 | if (nlflag == 0 && tokendlist[peektoken()]) | |
d787dbb5 KB |
120 | return NULL; |
121 | n1 = andor(); | |
122 | for (;;) { | |
123 | switch (readtoken()) { | |
124 | case TBACKGND: | |
125 | if (n1->type == NCMD || n1->type == NPIPE) { | |
126 | n1->ncmd.backgnd = 1; | |
127 | } else if (n1->type == NREDIR) { | |
128 | n1->type = NBACKGND; | |
129 | } else { | |
130 | n3 = (union node *)stalloc(sizeof (struct nredir)); | |
131 | n3->type = NBACKGND; | |
132 | n3->nredir.n = n1; | |
133 | n3->nredir.redirect = NULL; | |
134 | n1 = n3; | |
135 | } | |
136 | goto tsemi; | |
137 | case TNL: | |
138 | tokpushback++; | |
139 | /* fall through */ | |
140 | tsemi: case TSEMI: | |
141 | if (readtoken() == TNL) { | |
142 | parseheredoc(); | |
143 | if (nlflag) | |
144 | return n1; | |
145 | } else { | |
146 | tokpushback++; | |
147 | } | |
21679e1e MT |
148 | checkkwd = 2; |
149 | if (tokendlist[peektoken()]) | |
d787dbb5 KB |
150 | return n1; |
151 | n2 = andor(); | |
152 | n3 = (union node *)stalloc(sizeof (struct nbinary)); | |
153 | n3->type = NSEMI; | |
154 | n3->nbinary.ch1 = n1; | |
155 | n3->nbinary.ch2 = n2; | |
156 | n1 = n3; | |
157 | break; | |
158 | case TEOF: | |
159 | if (heredoclist) | |
160 | parseheredoc(); | |
161 | else | |
162 | pungetc(); /* push back EOF on input */ | |
163 | return n1; | |
164 | default: | |
165 | if (nlflag) | |
166 | synexpect(-1); | |
167 | tokpushback++; | |
168 | return n1; | |
169 | } | |
170 | } | |
171 | } | |
172 | ||
173 | ||
174 | ||
175 | STATIC union node * | |
176 | andor() { | |
177 | union node *n1, *n2, *n3; | |
178 | int t; | |
179 | ||
180 | n1 = pipeline(); | |
181 | for (;;) { | |
182 | if ((t = readtoken()) == TAND) { | |
183 | t = NAND; | |
184 | } else if (t == TOR) { | |
185 | t = NOR; | |
186 | } else { | |
187 | tokpushback++; | |
188 | return n1; | |
189 | } | |
190 | n2 = pipeline(); | |
191 | n3 = (union node *)stalloc(sizeof (struct nbinary)); | |
192 | n3->type = t; | |
193 | n3->nbinary.ch1 = n1; | |
194 | n3->nbinary.ch2 = n2; | |
195 | n1 = n3; | |
196 | } | |
197 | } | |
198 | ||
199 | ||
200 | ||
201 | STATIC union node * | |
202 | pipeline() { | |
1545e6b2 | 203 | union node *n1, *pipenode, *notnode; |
d787dbb5 | 204 | struct nodelist *lp, *prev; |
1545e6b2 | 205 | int negate = 0; |
d787dbb5 | 206 | |
1545e6b2 MT |
207 | TRACE(("pipeline: entered\n")); |
208 | while (readtoken() == TNOT) { | |
209 | TRACE(("pipeline: TNOT recognized\n")); | |
210 | negate = !negate; | |
211 | } | |
212 | tokpushback++; | |
d787dbb5 KB |
213 | n1 = command(); |
214 | if (readtoken() == TPIPE) { | |
215 | pipenode = (union node *)stalloc(sizeof (struct npipe)); | |
216 | pipenode->type = NPIPE; | |
217 | pipenode->npipe.backgnd = 0; | |
218 | lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); | |
219 | pipenode->npipe.cmdlist = lp; | |
220 | lp->n = n1; | |
221 | do { | |
222 | prev = lp; | |
223 | lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); | |
224 | lp->n = command(); | |
225 | prev->next = lp; | |
226 | } while (readtoken() == TPIPE); | |
227 | lp->next = NULL; | |
228 | n1 = pipenode; | |
229 | } | |
230 | tokpushback++; | |
1545e6b2 MT |
231 | if (negate) { |
232 | notnode = (union node *)stalloc(sizeof (struct nnot)); | |
233 | notnode->type = NNOT; | |
234 | notnode->nnot.com = n1; | |
235 | n1 = notnode; | |
236 | } | |
d787dbb5 KB |
237 | return n1; |
238 | } | |
239 | ||
240 | ||
241 | ||
242 | STATIC union node * | |
243 | command() { | |
244 | union node *n1, *n2; | |
245 | union node *ap, **app; | |
246 | union node *cp, **cpp; | |
247 | union node *redir, **rpp; | |
248 | int t; | |
249 | ||
21679e1e | 250 | checkkwd = 2; |
ddc16cae MT |
251 | redir = 0; |
252 | rpp = &redir; | |
253 | /* Check for redirection which may precede command */ | |
254 | while (readtoken() == TREDIR) { | |
255 | *rpp = n2 = redirnode; | |
256 | rpp = &n2->nfile.next; | |
257 | parsefname(); | |
258 | } | |
259 | tokpushback++; | |
260 | ||
d787dbb5 KB |
261 | switch (readtoken()) { |
262 | case TIF: | |
263 | n1 = (union node *)stalloc(sizeof (struct nif)); | |
264 | n1->type = NIF; | |
265 | n1->nif.test = list(0); | |
266 | if (readtoken() != TTHEN) | |
267 | synexpect(TTHEN); | |
268 | n1->nif.ifpart = list(0); | |
269 | n2 = n1; | |
270 | while (readtoken() == TELIF) { | |
271 | n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); | |
272 | n2 = n2->nif.elsepart; | |
273 | n2->type = NIF; | |
274 | n2->nif.test = list(0); | |
275 | if (readtoken() != TTHEN) | |
276 | synexpect(TTHEN); | |
277 | n2->nif.ifpart = list(0); | |
278 | } | |
279 | if (lasttoken == TELSE) | |
280 | n2->nif.elsepart = list(0); | |
281 | else { | |
282 | n2->nif.elsepart = NULL; | |
283 | tokpushback++; | |
284 | } | |
285 | if (readtoken() != TFI) | |
286 | synexpect(TFI); | |
21679e1e | 287 | checkkwd = 1; |
d787dbb5 KB |
288 | break; |
289 | case TWHILE: | |
21679e1e MT |
290 | case TUNTIL: { |
291 | int got; | |
d787dbb5 KB |
292 | n1 = (union node *)stalloc(sizeof (struct nbinary)); |
293 | n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; | |
294 | n1->nbinary.ch1 = list(0); | |
21679e1e MT |
295 | if ((got=readtoken()) != TDO) { |
296 | TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); | |
d787dbb5 | 297 | synexpect(TDO); |
21679e1e | 298 | } |
d787dbb5 KB |
299 | n1->nbinary.ch2 = list(0); |
300 | if (readtoken() != TDONE) | |
301 | synexpect(TDONE); | |
21679e1e | 302 | checkkwd = 1; |
d787dbb5 | 303 | break; |
21679e1e | 304 | } |
d787dbb5 KB |
305 | case TFOR: |
306 | if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) | |
307 | synerror("Bad for loop variable"); | |
308 | n1 = (union node *)stalloc(sizeof (struct nfor)); | |
309 | n1->type = NFOR; | |
310 | n1->nfor.var = wordtext; | |
311 | if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) { | |
312 | app = ≈ | |
313 | while (readtoken() == TWORD) { | |
314 | n2 = (union node *)stalloc(sizeof (struct narg)); | |
315 | n2->type = NARG; | |
316 | n2->narg.text = wordtext; | |
317 | n2->narg.backquote = backquotelist; | |
318 | *app = n2; | |
319 | app = &n2->narg.next; | |
320 | } | |
321 | *app = NULL; | |
322 | n1->nfor.args = ap; | |
4205db2c CT |
323 | if (lasttoken != TNL && lasttoken != TSEMI) |
324 | synexpect(-1); | |
d787dbb5 KB |
325 | } else { |
326 | #ifndef GDB_HACK | |
327 | static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, | |
328 | '@', '=', '\0'}; | |
329 | #endif | |
330 | n2 = (union node *)stalloc(sizeof (struct narg)); | |
331 | n2->type = NARG; | |
332 | n2->narg.text = (char *)argvars; | |
333 | n2->narg.backquote = NULL; | |
334 | n2->narg.next = NULL; | |
335 | n1->nfor.args = n2; | |
4205db2c CT |
336 | /* |
337 | * Newline or semicolon here is optional (but note | |
338 | * that the original Bourne shell only allowed NL). | |
339 | */ | |
340 | if (lasttoken != TNL && lasttoken != TSEMI) | |
341 | tokpushback++; | |
d787dbb5 | 342 | } |
21679e1e | 343 | checkkwd = 2; |
d787dbb5 KB |
344 | if ((t = readtoken()) == TDO) |
345 | t = TDONE; | |
346 | else if (t == TBEGIN) | |
347 | t = TEND; | |
348 | else | |
349 | synexpect(-1); | |
350 | n1->nfor.body = list(0); | |
351 | if (readtoken() != t) | |
352 | synexpect(t); | |
21679e1e | 353 | checkkwd = 1; |
d787dbb5 KB |
354 | break; |
355 | case TCASE: | |
356 | n1 = (union node *)stalloc(sizeof (struct ncase)); | |
357 | n1->type = NCASE; | |
358 | if (readtoken() != TWORD) | |
359 | synexpect(TWORD); | |
360 | n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); | |
361 | n2->type = NARG; | |
362 | n2->narg.text = wordtext; | |
363 | n2->narg.backquote = backquotelist; | |
364 | n2->narg.next = NULL; | |
365 | while (readtoken() == TNL); | |
366 | if (lasttoken != TWORD || ! equal(wordtext, "in")) | |
367 | synerror("expecting \"in\""); | |
368 | cpp = &n1->ncase.cases; | |
21679e1e | 369 | while (checkkwd = 2, readtoken() == TWORD) { |
d787dbb5 KB |
370 | *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); |
371 | cp->type = NCLIST; | |
372 | app = &cp->nclist.pattern; | |
373 | for (;;) { | |
374 | *app = ap = (union node *)stalloc(sizeof (struct narg)); | |
375 | ap->type = NARG; | |
376 | ap->narg.text = wordtext; | |
377 | ap->narg.backquote = backquotelist; | |
378 | if (readtoken() != TPIPE) | |
379 | break; | |
380 | app = &ap->narg.next; | |
381 | if (readtoken() != TWORD) | |
382 | synexpect(TWORD); | |
383 | } | |
384 | ap->narg.next = NULL; | |
385 | if (lasttoken != TRP) | |
386 | synexpect(TRP); | |
387 | cp->nclist.body = list(0); | |
388 | if ((t = readtoken()) == TESAC) | |
389 | tokpushback++; | |
390 | else if (t != TENDCASE) | |
391 | synexpect(TENDCASE); | |
392 | cpp = &cp->nclist.next; | |
393 | } | |
394 | *cpp = NULL; | |
395 | if (lasttoken != TESAC) | |
396 | synexpect(TESAC); | |
21679e1e | 397 | checkkwd = 1; |
d787dbb5 KB |
398 | break; |
399 | case TLP: | |
400 | n1 = (union node *)stalloc(sizeof (struct nredir)); | |
401 | n1->type = NSUBSHELL; | |
402 | n1->nredir.n = list(0); | |
403 | n1->nredir.redirect = NULL; | |
404 | if (readtoken() != TRP) | |
405 | synexpect(TRP); | |
21679e1e | 406 | checkkwd = 1; |
d787dbb5 KB |
407 | break; |
408 | case TBEGIN: | |
409 | n1 = list(0); | |
410 | if (readtoken() != TEND) | |
411 | synexpect(TEND); | |
21679e1e | 412 | checkkwd = 1; |
d787dbb5 | 413 | break; |
ddc16cae MT |
414 | /* Handle an empty command like other simple commands. */ |
415 | case TNL: | |
d787dbb5 | 416 | case TWORD: |
d787dbb5 | 417 | tokpushback++; |
ddc16cae | 418 | return simplecmd(rpp, redir); |
d787dbb5 KB |
419 | default: |
420 | synexpect(-1); | |
421 | } | |
422 | ||
423 | /* Now check for redirection which may follow command */ | |
d787dbb5 KB |
424 | while (readtoken() == TREDIR) { |
425 | *rpp = n2 = redirnode; | |
426 | rpp = &n2->nfile.next; | |
427 | parsefname(); | |
428 | } | |
429 | tokpushback++; | |
430 | *rpp = NULL; | |
431 | if (redir) { | |
432 | if (n1->type != NSUBSHELL) { | |
433 | n2 = (union node *)stalloc(sizeof (struct nredir)); | |
434 | n2->type = NREDIR; | |
435 | n2->nredir.n = n1; | |
436 | n1 = n2; | |
437 | } | |
438 | n1->nredir.redirect = redir; | |
439 | } | |
440 | return n1; | |
441 | } | |
442 | ||
443 | ||
444 | STATIC union node * | |
ddc16cae MT |
445 | simplecmd(rpp, redir) |
446 | union node **rpp, *redir; | |
447 | { | |
d787dbb5 | 448 | union node *args, **app; |
ddc16cae | 449 | union node **orig_rpp = rpp; |
d787dbb5 KB |
450 | union node *n; |
451 | ||
ddc16cae MT |
452 | /* If we don't have any redirections already, then we must reset */ |
453 | /* rpp to be the address of the local redir variable. */ | |
454 | if (redir == 0) | |
455 | rpp = &redir; | |
456 | ||
d787dbb5 KB |
457 | args = NULL; |
458 | app = &args; | |
ddc16cae MT |
459 | /* |
460 | * We save the incoming value, because we need this for shell | |
461 | * functions. There can not be a redirect or an argument between | |
462 | * the function name and the open parenthesis. | |
463 | */ | |
464 | orig_rpp = rpp; | |
465 | ||
d787dbb5 KB |
466 | for (;;) { |
467 | if (readtoken() == TWORD) { | |
468 | n = (union node *)stalloc(sizeof (struct narg)); | |
469 | n->type = NARG; | |
470 | n->narg.text = wordtext; | |
471 | n->narg.backquote = backquotelist; | |
472 | *app = n; | |
473 | app = &n->narg.next; | |
474 | } else if (lasttoken == TREDIR) { | |
475 | *rpp = n = redirnode; | |
476 | rpp = &n->nfile.next; | |
477 | parsefname(); /* read name of redirection file */ | |
478 | } else if (lasttoken == TLP && app == &args->narg.next | |
ddc16cae | 479 | && rpp == orig_rpp) { |
d787dbb5 KB |
480 | /* We have a function */ |
481 | if (readtoken() != TRP) | |
482 | synexpect(TRP); | |
ddba57cd | 483 | #ifdef notdef |
d787dbb5 KB |
484 | if (! goodname(n->narg.text)) |
485 | synerror("Bad function name"); | |
ddba57cd | 486 | #endif |
d787dbb5 KB |
487 | n->type = NDEFUN; |
488 | n->narg.next = command(); | |
489 | return n; | |
490 | } else { | |
491 | tokpushback++; | |
492 | break; | |
493 | } | |
494 | } | |
495 | *app = NULL; | |
496 | *rpp = NULL; | |
497 | n = (union node *)stalloc(sizeof (struct ncmd)); | |
498 | n->type = NCMD; | |
499 | n->ncmd.backgnd = 0; | |
500 | n->ncmd.args = args; | |
501 | n->ncmd.redirect = redir; | |
502 | return n; | |
503 | } | |
504 | ||
505 | ||
506 | STATIC void | |
507 | parsefname() { | |
508 | union node *n = redirnode; | |
509 | ||
510 | if (readtoken() != TWORD) | |
511 | synexpect(-1); | |
512 | if (n->type == NHERE) { | |
513 | struct heredoc *here = heredoc; | |
514 | struct heredoc *p; | |
515 | int i; | |
516 | ||
517 | if (quoteflag == 0) | |
518 | n->type = NXHERE; | |
519 | TRACE(("Here document %d\n", n->type)); | |
520 | if (here->striptabs) { | |
521 | while (*wordtext == '\t') | |
522 | wordtext++; | |
523 | } | |
524 | if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) | |
525 | synerror("Illegal eof marker for << redirection"); | |
526 | rmescapes(wordtext); | |
527 | here->eofmark = wordtext; | |
528 | here->next = NULL; | |
529 | if (heredoclist == NULL) | |
530 | heredoclist = here; | |
531 | else { | |
532 | for (p = heredoclist ; p->next ; p = p->next); | |
533 | p->next = here; | |
534 | } | |
535 | } else if (n->type == NTOFD || n->type == NFROMFD) { | |
536 | if (is_digit(wordtext[0])) | |
537 | n->ndup.dupfd = digit_val(wordtext[0]); | |
538 | else if (wordtext[0] == '-') | |
539 | n->ndup.dupfd = -1; | |
540 | else | |
541 | goto bad; | |
542 | if (wordtext[1] != '\0') { | |
543 | bad: | |
544 | synerror("Bad fd number"); | |
545 | } | |
546 | } else { | |
547 | n->nfile.fname = (union node *)stalloc(sizeof (struct narg)); | |
548 | n = n->nfile.fname; | |
549 | n->type = NARG; | |
550 | n->narg.next = NULL; | |
551 | n->narg.text = wordtext; | |
552 | n->narg.backquote = backquotelist; | |
553 | } | |
554 | } | |
555 | ||
556 | ||
557 | /* | |
558 | * Input any here documents. | |
559 | */ | |
560 | ||
561 | STATIC void | |
562 | parseheredoc() { | |
563 | struct heredoc *here; | |
564 | union node *n; | |
565 | ||
566 | while (heredoclist) { | |
567 | here = heredoclist; | |
568 | heredoclist = here->next; | |
569 | if (needprompt) { | |
2458cbee | 570 | setprompt(2); |
d787dbb5 KB |
571 | needprompt = 0; |
572 | } | |
573 | readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, | |
574 | here->eofmark, here->striptabs); | |
575 | n = (union node *)stalloc(sizeof (struct narg)); | |
576 | n->narg.type = NARG; | |
577 | n->narg.next = NULL; | |
578 | n->narg.text = wordtext; | |
579 | n->narg.backquote = backquotelist; | |
580 | here->here->nhere.doc = n; | |
581 | } | |
582 | } | |
583 | ||
21679e1e MT |
584 | STATIC int |
585 | peektoken() { | |
d787dbb5 KB |
586 | int t; |
587 | ||
21679e1e | 588 | t = readtoken(); |
d787dbb5 | 589 | tokpushback++; |
21679e1e | 590 | return (t); |
d787dbb5 KB |
591 | } |
592 | ||
d787dbb5 KB |
593 | STATIC int xxreadtoken(); |
594 | ||
595 | STATIC int | |
596 | readtoken() { | |
597 | int t; | |
2458cbee MT |
598 | int savecheckkwd = checkkwd; |
599 | struct alias *ap; | |
21679e1e MT |
600 | #ifdef DEBUG |
601 | int alreadyseen = tokpushback; | |
602 | #endif | |
603 | ||
2458cbee | 604 | top: |
21679e1e MT |
605 | t = xxreadtoken(); |
606 | ||
607 | if (checkkwd) { | |
608 | /* | |
609 | * eat newlines | |
610 | */ | |
611 | if (checkkwd == 2) { | |
612 | checkkwd = 0; | |
613 | while (t == TNL) { | |
614 | parseheredoc(); | |
615 | t = xxreadtoken(); | |
616 | } | |
617 | } else | |
618 | checkkwd = 0; | |
619 | /* | |
2458cbee | 620 | * check for keywords and aliases |
21679e1e MT |
621 | */ |
622 | if (t == TWORD && !quoteflag) { | |
2458cbee | 623 | register char * const *pp, *s; |
21679e1e | 624 | |
ddc16cae | 625 | for (pp = (char **)parsekwd; *pp; pp++) { |
21679e1e MT |
626 | if (**pp == *wordtext && equal(*pp, wordtext)) { |
627 | lasttoken = t = pp - parsekwd + KWDOFFSET; | |
628 | TRACE(("keyword %s recognized\n", tokname[t])); | |
2458cbee | 629 | goto out; |
21679e1e MT |
630 | } |
631 | } | |
2458cbee MT |
632 | if (ap = lookupalias(wordtext, 1)) { |
633 | pushstring(ap->val, strlen(ap->val), ap); | |
634 | checkkwd = savecheckkwd; | |
635 | goto top; | |
636 | } | |
21679e1e | 637 | } |
2458cbee MT |
638 | out: |
639 | checkkwd = 0; | |
d787dbb5 | 640 | } |
21679e1e MT |
641 | #ifdef DEBUG |
642 | if (!alreadyseen) | |
643 | TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); | |
644 | else | |
645 | TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); | |
646 | #endif | |
647 | return (t); | |
d787dbb5 KB |
648 | } |
649 | ||
650 | ||
651 | /* | |
652 | * Read the next input token. | |
653 | * If the token is a word, we set backquotelist to the list of cmds in | |
654 | * backquotes. We set quoteflag to true if any part of the word was | |
655 | * quoted. | |
656 | * If the token is TREDIR, then we set redirnode to a structure containing | |
657 | * the redirection. | |
658 | * In all cases, the variable startlinno is set to the number of the line | |
659 | * on which the token starts. | |
660 | * | |
661 | * [Change comment: here documents and internal procedures] | |
662 | * [Readtoken shouldn't have any arguments. Perhaps we should make the | |
663 | * word parsing code into a separate routine. In this case, readtoken | |
664 | * doesn't need to have any internal procedures, but parseword does. | |
665 | * We could also make parseoperator in essence the main routine, and | |
666 | * have parseword (readtoken1?) handle both words and redirection.] | |
667 | */ | |
668 | ||
669 | #define RETURN(token) return lasttoken = token | |
670 | ||
671 | STATIC int | |
672 | xxreadtoken() { | |
673 | register c; | |
674 | ||
675 | if (tokpushback) { | |
676 | tokpushback = 0; | |
677 | return lasttoken; | |
678 | } | |
679 | if (needprompt) { | |
2458cbee | 680 | setprompt(2); |
d787dbb5 KB |
681 | needprompt = 0; |
682 | } | |
683 | startlinno = plinno; | |
684 | for (;;) { /* until token or start of word found */ | |
685 | c = pgetc_macro(); | |
686 | if (c == ' ' || c == '\t') | |
687 | continue; /* quick check for white space first */ | |
688 | switch (c) { | |
689 | case ' ': case '\t': | |
690 | continue; | |
691 | case '#': | |
692 | while ((c = pgetc()) != '\n' && c != PEOF); | |
693 | pungetc(); | |
694 | continue; | |
695 | case '\\': | |
696 | if (pgetc() == '\n') { | |
697 | startlinno = ++plinno; | |
698 | if (doprompt) | |
2458cbee MT |
699 | setprompt(2); |
700 | else | |
701 | setprompt(0); | |
d787dbb5 KB |
702 | continue; |
703 | } | |
704 | pungetc(); | |
705 | goto breakloop; | |
706 | case '\n': | |
707 | plinno++; | |
708 | needprompt = doprompt; | |
709 | RETURN(TNL); | |
710 | case PEOF: | |
711 | RETURN(TEOF); | |
712 | case '&': | |
713 | if (pgetc() == '&') | |
714 | RETURN(TAND); | |
715 | pungetc(); | |
716 | RETURN(TBACKGND); | |
717 | case '|': | |
718 | if (pgetc() == '|') | |
719 | RETURN(TOR); | |
720 | pungetc(); | |
721 | RETURN(TPIPE); | |
722 | case ';': | |
723 | if (pgetc() == ';') | |
724 | RETURN(TENDCASE); | |
725 | pungetc(); | |
726 | RETURN(TSEMI); | |
727 | case '(': | |
728 | RETURN(TLP); | |
729 | case ')': | |
730 | RETURN(TRP); | |
731 | default: | |
732 | goto breakloop; | |
733 | } | |
734 | } | |
735 | breakloop: | |
736 | return readtoken1(c, BASESYNTAX, (char *)NULL, 0); | |
737 | #undef RETURN | |
738 | } | |
739 | ||
740 | ||
741 | ||
742 | /* | |
743 | * If eofmark is NULL, read a word or a redirection symbol. If eofmark | |
744 | * is not NULL, read a here document. In the latter case, eofmark is the | |
745 | * word which marks the end of the document and striptabs is true if | |
746 | * leading tabs should be stripped from the document. The argument firstc | |
747 | * is the first character of the input token or document. | |
748 | * | |
749 | * Because C does not have internal subroutines, I have simulated them | |
750 | * using goto's to implement the subroutine linkage. The following macros | |
751 | * will run code that appears at the end of readtoken1. | |
752 | */ | |
753 | ||
754 | #define CHECKEND() {goto checkend; checkend_return:;} | |
755 | #define PARSEREDIR() {goto parseredir; parseredir_return:;} | |
756 | #define PARSESUB() {goto parsesub; parsesub_return:;} | |
757 | #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} | |
758 | #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} | |
df4e2023 | 759 | #define PARSEARITH() {goto parsearith; parsearith_return:;} |
d787dbb5 KB |
760 | |
761 | STATIC int | |
762 | readtoken1(firstc, syntax, eofmark, striptabs) | |
763 | int firstc; | |
764 | char const *syntax; | |
765 | char *eofmark; | |
766 | int striptabs; | |
767 | { | |
768 | register c = firstc; | |
769 | register char *out; | |
770 | int len; | |
771 | char line[EOFMARKLEN + 1]; | |
772 | struct nodelist *bqlist; | |
773 | int quotef; | |
774 | int dblquote; | |
df4e2023 MT |
775 | int varnest; /* levels of variables expansion */ |
776 | int arinest; /* levels of arithmetic expansion */ | |
777 | int parenlevel; /* levels of parens in arithmetic */ | |
d787dbb5 | 778 | int oldstyle; |
df4e2023 | 779 | char const *prevsyntax; /* syntax before arithmetic */ |
d787dbb5 KB |
780 | |
781 | startlinno = plinno; | |
782 | dblquote = 0; | |
783 | if (syntax == DQSYNTAX) | |
784 | dblquote = 1; | |
785 | quotef = 0; | |
786 | bqlist = NULL; | |
787 | varnest = 0; | |
df4e2023 MT |
788 | arinest = 0; |
789 | parenlevel = 0; | |
790 | ||
d787dbb5 KB |
791 | STARTSTACKSTR(out); |
792 | loop: { /* for each line, until end of word */ | |
793 | #if ATTY | |
794 | if (c == '\034' && doprompt | |
795 | && attyset() && ! equal(termval(), "emacs")) { | |
796 | attyline(); | |
797 | if (syntax == BASESYNTAX) | |
798 | return readtoken(); | |
799 | c = pgetc(); | |
800 | goto loop; | |
801 | } | |
802 | #endif | |
803 | CHECKEND(); /* set c to PEOF if at end of here document */ | |
804 | for (;;) { /* until end of line or end of word */ | |
805 | CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ | |
bc9e3d49 | 806 | if (parsebackquote && c == '\\') { |
197494a1 | 807 | c = pgetc(); /* XXX - compat with old /bin/sh */ |
bc9e3d49 MT |
808 | if (c != '\\' && c != '`' && c != '$') { |
809 | pungetc(); | |
810 | c = '\\'; | |
811 | } | |
812 | } | |
d787dbb5 KB |
813 | switch(syntax[c]) { |
814 | case CNL: /* '\n' */ | |
815 | if (syntax == BASESYNTAX) | |
816 | goto endword; /* exit outer loop */ | |
817 | USTPUTC(c, out); | |
818 | plinno++; | |
2458cbee MT |
819 | if (doprompt) |
820 | setprompt(2); | |
821 | else | |
822 | setprompt(0); | |
d787dbb5 KB |
823 | c = pgetc(); |
824 | goto loop; /* continue outer loop */ | |
825 | case CWORD: | |
826 | USTPUTC(c, out); | |
827 | break; | |
828 | case CCTL: | |
829 | if (eofmark == NULL || dblquote) | |
830 | USTPUTC(CTLESC, out); | |
831 | USTPUTC(c, out); | |
832 | break; | |
833 | case CBACK: /* backslash */ | |
834 | c = pgetc(); | |
835 | if (c == PEOF) { | |
836 | USTPUTC('\\', out); | |
837 | pungetc(); | |
838 | } else if (c == '\n') { | |
839 | if (doprompt) | |
2458cbee MT |
840 | setprompt(2); |
841 | else | |
842 | setprompt(0); | |
d787dbb5 KB |
843 | } else { |
844 | if (dblquote && c != '\\' && c != '`' && c != '$' | |
845 | && (c != '"' || eofmark != NULL)) | |
846 | USTPUTC('\\', out); | |
847 | if (SQSYNTAX[c] == CCTL) | |
848 | USTPUTC(CTLESC, out); | |
849 | USTPUTC(c, out); | |
850 | quotef++; | |
851 | } | |
852 | break; | |
853 | case CSQUOTE: | |
854 | syntax = SQSYNTAX; | |
855 | break; | |
856 | case CDQUOTE: | |
857 | syntax = DQSYNTAX; | |
858 | dblquote = 1; | |
859 | break; | |
860 | case CENDQUOTE: | |
861 | if (eofmark) { | |
862 | USTPUTC(c, out); | |
863 | } else { | |
df4e2023 MT |
864 | if (arinest) |
865 | syntax = ARISYNTAX; | |
866 | else | |
867 | syntax = BASESYNTAX; | |
d787dbb5 KB |
868 | quotef++; |
869 | dblquote = 0; | |
870 | } | |
871 | break; | |
872 | case CVAR: /* '$' */ | |
873 | PARSESUB(); /* parse substitution */ | |
874 | break; | |
875 | case CENDVAR: /* '}' */ | |
876 | if (varnest > 0) { | |
877 | varnest--; | |
878 | USTPUTC(CTLENDVAR, out); | |
879 | } else { | |
880 | USTPUTC(c, out); | |
881 | } | |
882 | break; | |
df4e2023 MT |
883 | case CLP: /* '(' in arithmetic */ |
884 | parenlevel++; | |
885 | USTPUTC(c, out); | |
886 | break; | |
887 | case CRP: /* ')' in arithmetic */ | |
888 | if (parenlevel > 0) { | |
889 | USTPUTC(c, out); | |
890 | --parenlevel; | |
891 | } else { | |
892 | if (pgetc() == ')') { | |
893 | if (--arinest == 0) { | |
894 | USTPUTC(CTLENDARI, out); | |
895 | syntax = prevsyntax; | |
896 | } else | |
897 | USTPUTC(')', out); | |
898 | } else { | |
899 | /* | |
900 | * unbalanced parens | |
901 | * (don't 2nd guess - no error) | |
902 | */ | |
903 | pungetc(); | |
904 | USTPUTC(')', out); | |
905 | } | |
906 | } | |
907 | break; | |
d787dbb5 | 908 | case CBQUOTE: /* '`' */ |
d787dbb5 KB |
909 | PARSEBACKQOLD(); |
910 | break; | |
911 | case CEOF: | |
912 | goto endword; /* exit outer loop */ | |
913 | default: | |
914 | if (varnest == 0) | |
915 | goto endword; /* exit outer loop */ | |
916 | USTPUTC(c, out); | |
917 | } | |
918 | c = pgetc_macro(); | |
919 | } | |
920 | } | |
921 | endword: | |
df4e2023 MT |
922 | if (syntax == ARISYNTAX) |
923 | synerror("Missing '))'"); | |
ddc16cae | 924 | if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL) |
d787dbb5 KB |
925 | synerror("Unterminated quoted string"); |
926 | if (varnest != 0) { | |
927 | startlinno = plinno; | |
928 | synerror("Missing '}'"); | |
929 | } | |
930 | USTPUTC('\0', out); | |
931 | len = out - stackblock(); | |
932 | out = stackblock(); | |
933 | if (eofmark == NULL) { | |
934 | if ((c == '>' || c == '<') | |
935 | && quotef == 0 | |
936 | && len <= 2 | |
937 | && (*out == '\0' || is_digit(*out))) { | |
938 | PARSEREDIR(); | |
939 | return lasttoken = TREDIR; | |
940 | } else { | |
941 | pungetc(); | |
942 | } | |
943 | } | |
944 | quoteflag = quotef; | |
945 | backquotelist = bqlist; | |
946 | grabstackblock(len); | |
947 | wordtext = out; | |
948 | return lasttoken = TWORD; | |
949 | /* end of readtoken routine */ | |
950 | ||
951 | ||
952 | ||
953 | /* | |
954 | * Check to see whether we are at the end of the here document. When this | |
955 | * is called, c is set to the first character of the next input line. If | |
956 | * we are at the end of the here document, this routine sets the c to PEOF. | |
957 | */ | |
958 | ||
959 | checkend: { | |
960 | if (eofmark) { | |
961 | if (striptabs) { | |
962 | while (c == '\t') | |
963 | c = pgetc(); | |
964 | } | |
965 | if (c == *eofmark) { | |
966 | if (pfgets(line, sizeof line) != NULL) { | |
967 | register char *p, *q; | |
968 | ||
969 | p = line; | |
970 | for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); | |
971 | if (*p == '\n' && *q == '\0') { | |
972 | c = PEOF; | |
973 | plinno++; | |
974 | needprompt = doprompt; | |
975 | } else { | |
2458cbee | 976 | pushstring(line, strlen(line), NULL); |
d787dbb5 KB |
977 | } |
978 | } | |
979 | } | |
980 | } | |
981 | goto checkend_return; | |
982 | } | |
983 | ||
984 | ||
985 | /* | |
986 | * Parse a redirection operator. The variable "out" points to a string | |
987 | * specifying the fd to be redirected. The variable "c" contains the | |
988 | * first character of the redirection operator. | |
989 | */ | |
990 | ||
991 | parseredir: { | |
992 | char fd = *out; | |
993 | union node *np; | |
994 | ||
995 | np = (union node *)stalloc(sizeof (struct nfile)); | |
996 | if (c == '>') { | |
997 | np->nfile.fd = 1; | |
998 | c = pgetc(); | |
999 | if (c == '>') | |
1000 | np->type = NAPPEND; | |
1001 | else if (c == '&') | |
1002 | np->type = NTOFD; | |
1003 | else { | |
1004 | np->type = NTO; | |
1005 | pungetc(); | |
1006 | } | |
1007 | } else { /* c == '<' */ | |
1008 | np->nfile.fd = 0; | |
1009 | c = pgetc(); | |
1010 | if (c == '<') { | |
1011 | if (sizeof (struct nfile) != sizeof (struct nhere)) { | |
1012 | np = (union node *)stalloc(sizeof (struct nhere)); | |
1013 | np->nfile.fd = 0; | |
1014 | } | |
1015 | np->type = NHERE; | |
1016 | heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); | |
1017 | heredoc->here = np; | |
1018 | if ((c = pgetc()) == '-') { | |
1019 | heredoc->striptabs = 1; | |
1020 | } else { | |
1021 | heredoc->striptabs = 0; | |
1022 | pungetc(); | |
1023 | } | |
1024 | } else if (c == '&') | |
1025 | np->type = NFROMFD; | |
1026 | else { | |
1027 | np->type = NFROM; | |
1028 | pungetc(); | |
1029 | } | |
1030 | } | |
1031 | if (fd != '\0') | |
1032 | np->nfile.fd = digit_val(fd); | |
1033 | redirnode = np; | |
1034 | goto parseredir_return; | |
1035 | } | |
1036 | ||
1037 | ||
1038 | /* | |
1039 | * Parse a substitution. At this point, we have read the dollar sign | |
1040 | * and nothing else. | |
1041 | */ | |
1042 | ||
1043 | parsesub: { | |
1044 | int subtype; | |
1045 | int typeloc; | |
1046 | int flags; | |
1047 | char *p; | |
1048 | #ifndef GDB_HACK | |
1049 | static const char types[] = "}-+?="; | |
1050 | #endif | |
1051 | ||
1052 | c = pgetc(); | |
ddba57cd | 1053 | if (c != '(' && c != '{' && !is_name(c) && !is_special(c)) { |
d787dbb5 KB |
1054 | USTPUTC('$', out); |
1055 | pungetc(); | |
df4e2023 MT |
1056 | } else if (c == '(') { /* $(command) or $((arith)) */ |
1057 | if (pgetc() == '(') { | |
1058 | PARSEARITH(); | |
1059 | } else { | |
1060 | pungetc(); | |
1061 | PARSEBACKQNEW(); | |
1062 | } | |
d787dbb5 KB |
1063 | } else { |
1064 | USTPUTC(CTLVAR, out); | |
1065 | typeloc = out - stackblock(); | |
1066 | USTPUTC(VSNORMAL, out); | |
1067 | subtype = VSNORMAL; | |
1068 | if (c == '{') { | |
1069 | c = pgetc(); | |
1070 | subtype = 0; | |
1071 | } | |
1072 | if (is_name(c)) { | |
1073 | do { | |
1074 | STPUTC(c, out); | |
1075 | c = pgetc(); | |
1076 | } while (is_in_name(c)); | |
1077 | } else { | |
1078 | if (! is_special(c)) | |
ddba57cd | 1079 | badsub: synerror("Bad substitution"); |
d787dbb5 KB |
1080 | USTPUTC(c, out); |
1081 | c = pgetc(); | |
1082 | } | |
1083 | STPUTC('=', out); | |
1084 | flags = 0; | |
1085 | if (subtype == 0) { | |
1086 | if (c == ':') { | |
1087 | flags = VSNUL; | |
1088 | c = pgetc(); | |
1089 | } | |
1090 | p = strchr(types, c); | |
1091 | if (p == NULL) | |
1092 | goto badsub; | |
1093 | subtype = p - types + VSNORMAL; | |
1094 | } else { | |
1095 | pungetc(); | |
1096 | } | |
df4e2023 | 1097 | if (dblquote || arinest) |
d787dbb5 KB |
1098 | flags |= VSQUOTE; |
1099 | *(stackblock() + typeloc) = subtype | flags; | |
1100 | if (subtype != VSNORMAL) | |
1101 | varnest++; | |
1102 | } | |
1103 | goto parsesub_return; | |
1104 | } | |
1105 | ||
1106 | ||
1107 | /* | |
1108 | * Called to parse command substitutions. Newstyle is set if the command | |
1109 | * is enclosed inside $(...); nlpp is a pointer to the head of the linked | |
1110 | * list of commands (passed by reference), and savelen is the number of | |
1111 | * characters on the top of the stack which must be preserved. | |
1112 | */ | |
1113 | ||
1114 | parsebackq: { | |
1115 | struct nodelist **nlpp; | |
1116 | int savepbq; | |
1117 | union node *n; | |
1118 | char *volatile str; | |
1119 | struct jmploc jmploc; | |
1120 | struct jmploc *volatile savehandler; | |
1121 | int savelen; | |
d787dbb5 KB |
1122 | |
1123 | savepbq = parsebackquote; | |
1124 | if (setjmp(jmploc.loc)) { | |
1125 | if (str) | |
1126 | ckfree(str); | |
1127 | parsebackquote = 0; | |
1128 | handler = savehandler; | |
2458cbee | 1129 | longjmp(handler->loc, 1); |
d787dbb5 KB |
1130 | } |
1131 | INTOFF; | |
1132 | str = NULL; | |
1133 | savelen = out - stackblock(); | |
1134 | if (savelen > 0) { | |
1135 | str = ckmalloc(savelen); | |
1136 | bcopy(stackblock(), str, savelen); | |
1137 | } | |
1138 | savehandler = handler; | |
1139 | handler = &jmploc; | |
1140 | INTON; | |
ddc16cae MT |
1141 | if (oldstyle) { |
1142 | /* We must read until the closing backquote, giving special | |
1143 | treatment to some slashes, and then push the string and | |
1144 | reread it as input, interpreting it normally. */ | |
1145 | register char *out; | |
1146 | register c; | |
1147 | int savelen; | |
1148 | char *str; | |
1149 | ||
1150 | STARTSTACKSTR(out); | |
1151 | while ((c = pgetc ()) != '`') { | |
1152 | if (c == '\\') { | |
1153 | c = pgetc (); | |
1154 | if (c != '\\' && c != '`' && c != '$' | |
1155 | && (!dblquote || c != '"')) | |
1156 | STPUTC('\\', out); | |
1157 | } | |
1158 | STPUTC(c, out); | |
1159 | } | |
1160 | STPUTC('\0', out); | |
1161 | savelen = out - stackblock(); | |
1162 | if (savelen > 0) { | |
1163 | str = ckmalloc(savelen); | |
1164 | bcopy(stackblock(), str, savelen); | |
1165 | } | |
1166 | setinputstring(str, 1); | |
1167 | } | |
d787dbb5 KB |
1168 | nlpp = &bqlist; |
1169 | while (*nlpp) | |
1170 | nlpp = &(*nlpp)->next; | |
1171 | *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); | |
1172 | (*nlpp)->next = NULL; | |
1173 | parsebackquote = oldstyle; | |
1174 | n = list(0); | |
ddc16cae MT |
1175 | if (!oldstyle && (readtoken() != TRP)) |
1176 | synexpect(TRP); | |
d787dbb5 | 1177 | (*nlpp)->n = n; |
ddc16cae MT |
1178 | /* Start reading from old file again. */ |
1179 | if (oldstyle) | |
1180 | popfile(); | |
d787dbb5 KB |
1181 | while (stackblocksize() <= savelen) |
1182 | growstackblock(); | |
1183 | STARTSTACKSTR(out); | |
1184 | if (str) { | |
1185 | bcopy(str, out, savelen); | |
1186 | STADJUST(savelen, out); | |
1187 | INTOFF; | |
1188 | ckfree(str); | |
1189 | str = NULL; | |
1190 | INTON; | |
1191 | } | |
1192 | parsebackquote = savepbq; | |
1193 | handler = savehandler; | |
df4e2023 MT |
1194 | if (arinest || dblquote) |
1195 | USTPUTC(CTLBACKQ | CTLQUOTE, out); | |
1196 | else | |
1197 | USTPUTC(CTLBACKQ, out); | |
d787dbb5 KB |
1198 | if (oldstyle) |
1199 | goto parsebackq_oldreturn; | |
1200 | else | |
1201 | goto parsebackq_newreturn; | |
1202 | } | |
1203 | ||
df4e2023 MT |
1204 | /* |
1205 | * Parse an arithmetic expansion (indicate start of one and set state) | |
1206 | */ | |
1207 | parsearith: { | |
1208 | ||
1209 | if (++arinest == 1) { | |
1210 | prevsyntax = syntax; | |
1211 | syntax = ARISYNTAX; | |
1212 | USTPUTC(CTLARI, out); | |
1213 | } else { | |
1214 | /* | |
1215 | * we collapse embedded arithmetic expansion to | |
1216 | * parenthesis, which should be equivalent | |
1217 | */ | |
1218 | USTPUTC('(', out); | |
1219 | } | |
1220 | goto parsearith_return; | |
1221 | } | |
1222 | ||
d787dbb5 KB |
1223 | } /* end of readtoken */ |
1224 | ||
1225 | ||
1226 | ||
1227 | #ifdef mkinit | |
1228 | RESET { | |
1229 | tokpushback = 0; | |
2458cbee | 1230 | checkkwd = 0; |
d787dbb5 KB |
1231 | } |
1232 | #endif | |
1233 | ||
d787dbb5 KB |
1234 | /* |
1235 | * Returns true if the text contains nothing to expand (no dollar signs | |
1236 | * or backquotes). | |
1237 | */ | |
1238 | ||
1239 | STATIC int | |
1240 | noexpand(text) | |
1241 | char *text; | |
1242 | { | |
1243 | register char *p; | |
1244 | register char c; | |
1245 | ||
1246 | p = text; | |
1247 | while ((c = *p++) != '\0') { | |
1248 | if (c == CTLESC) | |
1249 | p++; | |
1250 | else if (BASESYNTAX[c] == CCTL) | |
1251 | return 0; | |
1252 | } | |
1253 | return 1; | |
1254 | } | |
1255 | ||
1256 | ||
1257 | /* | |
1258 | * Return true if the argument is a legal variable name (a letter or | |
1259 | * underscore followed by zero or more letters, underscores, and digits). | |
1260 | */ | |
1261 | ||
1262 | int | |
1263 | goodname(name) | |
1264 | char *name; | |
1265 | { | |
1266 | register char *p; | |
1267 | ||
1268 | p = name; | |
1269 | if (! is_name(*p)) | |
1270 | return 0; | |
1271 | while (*++p) { | |
1272 | if (! is_in_name(*p)) | |
1273 | return 0; | |
1274 | } | |
1275 | return 1; | |
1276 | } | |
1277 | ||
1278 | ||
1279 | /* | |
1280 | * Called when an unexpected token is read during the parse. The argument | |
1281 | * is the token that is expected, or -1 if more than one type of token can | |
1282 | * occur at this point. | |
1283 | */ | |
1284 | ||
1285 | STATIC void | |
1286 | synexpect(token) { | |
1287 | char msg[64]; | |
1288 | ||
1289 | if (token >= 0) { | |
1290 | fmtstr(msg, 64, "%s unexpected (expecting %s)", | |
1291 | tokname[lasttoken], tokname[token]); | |
1292 | } else { | |
1293 | fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); | |
1294 | } | |
1295 | synerror(msg); | |
1296 | } | |
1297 | ||
1298 | ||
1299 | STATIC void | |
1300 | synerror(msg) | |
1301 | char *msg; | |
1302 | { | |
1303 | if (commandname) | |
1304 | outfmt(&errout, "%s: %d: ", commandname, startlinno); | |
1305 | outfmt(&errout, "Syntax error: %s\n", msg); | |
1306 | error((char *)NULL); | |
1307 | } | |
2458cbee MT |
1308 | |
1309 | STATIC void | |
1310 | setprompt(which) | |
1311 | int which; | |
1312 | { | |
1313 | whichprompt = which; | |
1314 | ||
1315 | if (!el) | |
1316 | out2str(getprompt(NULL)); | |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * called by editline -- any expansions to the prompt | |
1321 | * should be added here. | |
1322 | */ | |
1323 | char * | |
1324 | getprompt(unused) | |
1325 | void *unused; | |
1326 | { | |
1327 | switch (whichprompt) { | |
1328 | case 0: | |
1329 | return ""; | |
1330 | case 1: | |
1331 | return ps1val(); | |
1332 | case 2: | |
1333 | return ps2val(); | |
1334 | default: | |
1335 | return "<internal prompt error>"; | |
1336 | } | |
1337 | } |