parser.c@ 2017

Last change on this file since 2017 was 809, checked in by bird, 18 years ago
Solaris + cleanup.
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File size: 35.2 KB

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1	/* $NetBSD: parser.c,v 1.59 2005/03/21 20:10:29 dsl Exp $ */
2
3	/*-
4	* Copyright (c) 1991, 1993
5	* The Regents of the University of California. 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	#ifdef HAVE_SYS_CDEFS_H
36	#include <sys/cdefs.h>
37	#endif
38	#ifndef lint
39	#if 0
40	static char sccsid[] = "@(#)parser.c 8.7 (Berkeley) 5/16/95";
41	#else
42	__RCSID("$NetBSD: parser.c,v 1.59 2005/03/21 20:10:29 dsl Exp $");
43	#endif
44	#endif /* not lint */
45
46	#include <stdlib.h>
47	#ifdef __sun__
48	#include <iso/limits_iso.h>
49	#endif
50
51	#include "shell.h"
52	#include "parser.h"
53	#include "nodes.h"
54	#include "expand.h" /* defines rmescapes() */
55	#include "eval.h" /* defines commandname */
56	#include "redir.h" /* defines copyfd() */
57	#include "syntax.h"
58	#include "options.h"
59	#include "input.h"
60	#include "output.h"
61	#include "var.h"
62	#include "error.h"
63	#include "memalloc.h"
64	#include "mystring.h"
65	#include "alias.h"
66	#include "show.h"
67	#ifndef SMALL
68	#include "myhistedit.h"
69	#endif
70
71	/*
72	* Shell command parser.
73	*/
74
75	#define EOFMARKLEN 79
76
77	/* values returned by readtoken */
78	#include "token.h"
79
80	#define OPENBRACE '{'
81	#define CLOSEBRACE '}'
82
83
84	struct heredoc {
85	struct heredoc next; / next here document in list */
86	union node here; / redirection node */
87	char eofmark; / string indicating end of input */
88	int striptabs; /* if set, strip leading tabs */
89	};
90
91
92
93	static int noalias = 0; /* when set, don't handle aliases */
94	struct heredoc heredoclist; / list of here documents to read */
95	int parsebackquote; /* nonzero if we are inside backquotes */
96	int doprompt; /* if set, prompt the user */
97	int needprompt; /* true if interactive and at start of line */
98	int lasttoken; /* last token read */
99	MKINIT int tokpushback; /* last token pushed back */
100	char wordtext; / text of last word returned by readtoken */
101	MKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
102	struct nodelist *backquotelist;
103	union node *redirnode;
104	struct heredoc *heredoc;
105	int quoteflag; /* set if (part of) last token was quoted */
106	int startlinno; /* line # where last token started */
107
108
109	STATIC union node *list(int);
110	STATIC union node *andor(void);
111	STATIC union node *pipeline(void);
112	STATIC union node *command(void);
113	STATIC union node simplecmd(union node , union node );
114	STATIC union node *makename(void);
115	STATIC void parsefname(void);
116	STATIC void parseheredoc(void);
117	STATIC int peektoken(void);
118	STATIC int readtoken(void);
119	STATIC int xxreadtoken(void);
120	STATIC int readtoken1(int, char const , char , int);
121	STATIC int noexpand(char *);
122	STATIC void synexpect(int) __attribute__((__noreturn__));
123	STATIC void synerror(const char *) __attribute__((__noreturn__));
124	STATIC void setprompt(int);
125
126
127	/*
128	* Read and parse a command. Returns NEOF on end of file. (NULL is a
129	* valid parse tree indicating a blank line.)
130	*/
131
132	union node *
133	parsecmd(int interact)
134	{
135	int t;
136
137	tokpushback = 0;
138	doprompt = interact;
139	if (doprompt)
140	setprompt(1);
141	else
142	setprompt(0);
143	needprompt = 0;
144	t = readtoken();
145	if (t == TEOF)
146	return NEOF;
147	if (t == TNL)
148	return NULL;
149	tokpushback++;
150	return list(1);
151	}
152
153
154	STATIC union node *
155	list(int nlflag)
156	{
157	union node n1, n2, *n3;
158	int tok;
159
160	checkkwd = 2;
161	if (nlflag == 0 && tokendlist[peektoken()])
162	return NULL;
163	n1 = NULL;
164	for (;;) {
165	n2 = andor();
166	tok = readtoken();
167	if (tok == TBACKGND) {
168	if (n2->type == NCMD \|\| n2->type == NPIPE) {
169	n2->ncmd.backgnd = 1;
170	} else if (n2->type == NREDIR) {
171	n2->type = NBACKGND;
172	} else {
173	n3 = (union node *)stalloc(sizeof (struct nredir));
174	n3->type = NBACKGND;
175	n3->nredir.n = n2;
176	n3->nredir.redirect = NULL;
177	n2 = n3;
178	}
179	}
180	if (n1 == NULL) {
181	n1 = n2;
182	}
183	else {
184	n3 = (union node *)stalloc(sizeof (struct nbinary));
185	n3->type = NSEMI;
186	n3->nbinary.ch1 = n1;
187	n3->nbinary.ch2 = n2;
188	n1 = n3;
189	}
190	switch (tok) {
191	case TBACKGND:
192	case TSEMI:
193	tok = readtoken();
194	/* fall through */
195	case TNL:
196	if (tok == TNL) {
197	parseheredoc();
198	if (nlflag)
199	return n1;
200	} else {
201	tokpushback++;
202	}
203	checkkwd = 2;
204	if (tokendlist[peektoken()])
205	return n1;
206	break;
207	case TEOF:
208	if (heredoclist)
209	parseheredoc();
210	else
211	pungetc(); /* push back EOF on input */
212	return n1;
213	default:
214	if (nlflag)
215	synexpect(-1);
216	tokpushback++;
217	return n1;
218	}
219	}
220	}
221
222
223
224	STATIC union node *
225	andor(void)
226	{
227	union node n1, n2, *n3;
228	int t;
229
230	n1 = pipeline();
231	for (;;) {
232	if ((t = readtoken()) == TAND) {
233	t = NAND;
234	} else if (t == TOR) {
235	t = NOR;
236	} else {
237	tokpushback++;
238	return n1;
239	}
240	n2 = pipeline();
241	n3 = (union node *)stalloc(sizeof (struct nbinary));
242	n3->type = t;
243	n3->nbinary.ch1 = n1;
244	n3->nbinary.ch2 = n2;
245	n1 = n3;
246	}
247	}
248
249
250
251	STATIC union node *
252	pipeline(void)
253	{
254	union node n1, n2, *pipenode;
255	struct nodelist lp, prev;
256	int negate;
257
258	negate = 0;
259	TRACE(("pipeline: entered\n"));
260	while (readtoken() == TNOT)
261	negate = !negate;
262	tokpushback++;
263	n1 = command();
264	if (readtoken() == TPIPE) {
265	pipenode = (union node *)stalloc(sizeof (struct npipe));
266	pipenode->type = NPIPE;
267	pipenode->npipe.backgnd = 0;
268	lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
269	pipenode->npipe.cmdlist = lp;
270	lp->n = n1;
271	do {
272	prev = lp;
273	lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
274	lp->n = command();
275	prev->next = lp;
276	} while (readtoken() == TPIPE);
277	lp->next = NULL;
278	n1 = pipenode;
279	}
280	tokpushback++;
281	if (negate) {
282	n2 = (union node *)stalloc(sizeof (struct nnot));
283	n2->type = NNOT;
284	n2->nnot.com = n1;
285	return n2;
286	} else
287	return n1;
288	}
289
290
291
292	STATIC union node *
293	command(void)
294	{
295	union node n1, n2;
296	union node ap, *app;
297	union node cp, *cpp;
298	union node redir, *rpp;
299	int t, negate = 0;
300
301	checkkwd = 2;
302	redir = NULL;
303	n1 = NULL;
304	rpp = &redir;
305
306	/* Check for redirection which may precede command */
307	while (readtoken() == TREDIR) {
308	*rpp = n2 = redirnode;
309	rpp = &n2->nfile.next;
310	parsefname();
311	}
312	tokpushback++;
313
314	while (readtoken() == TNOT) {
315	TRACE(("command: TNOT recognized\n"));
316	negate = !negate;
317	}
318	tokpushback++;
319
320	switch (readtoken()) {
321	case TIF:
322	n1 = (union node *)stalloc(sizeof (struct nif));
323	n1->type = NIF;
324	n1->nif.test = list(0);
325	if (readtoken() != TTHEN)
326	synexpect(TTHEN);
327	n1->nif.ifpart = list(0);
328	n2 = n1;
329	while (readtoken() == TELIF) {
330	n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
331	n2 = n2->nif.elsepart;
332	n2->type = NIF;
333	n2->nif.test = list(0);
334	if (readtoken() != TTHEN)
335	synexpect(TTHEN);
336	n2->nif.ifpart = list(0);
337	}
338	if (lasttoken == TELSE)
339	n2->nif.elsepart = list(0);
340	else {
341	n2->nif.elsepart = NULL;
342	tokpushback++;
343	}
344	if (readtoken() != TFI)
345	synexpect(TFI);
346	checkkwd = 1;
347	break;
348	case TWHILE:
349	case TUNTIL: {
350	int got;
351	n1 = (union node *)stalloc(sizeof (struct nbinary));
352	n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
353	n1->nbinary.ch1 = list(0);
354	if ((got=readtoken()) != TDO) {
355	TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : ""));
356	synexpect(TDO);
357	}
358	n1->nbinary.ch2 = list(0);
359	if (readtoken() != TDONE)
360	synexpect(TDONE);
361	checkkwd = 1;
362	break;
363	}
364	case TFOR:
365	if (readtoken() != TWORD \|\| quoteflag \|\| ! goodname(wordtext))
366	synerror("Bad for loop variable");
367	n1 = (union node *)stalloc(sizeof (struct nfor));
368	n1->type = NFOR;
369	n1->nfor.var = wordtext;
370	if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) {
371	app = ≈
372	while (readtoken() == TWORD) {
373	n2 = (union node *)stalloc(sizeof (struct narg));
374	n2->type = NARG;
375	n2->narg.text = wordtext;
376	n2->narg.backquote = backquotelist;
377	*app = n2;
378	app = &n2->narg.next;
379	}
380	*app = NULL;
381	n1->nfor.args = ap;
382	if (lasttoken != TNL && lasttoken != TSEMI)
383	synexpect(-1);
384	} else {
385	static char argvars[5] = {CTLVAR, VSNORMAL\|VSQUOTE,
386	'@', '=', '\0'};
387	n2 = (union node *)stalloc(sizeof (struct narg));
388	n2->type = NARG;
389	n2->narg.text = argvars;
390	n2->narg.backquote = NULL;
391	n2->narg.next = NULL;
392	n1->nfor.args = n2;
393	/*
394	* Newline or semicolon here is optional (but note
395	* that the original Bourne shell only allowed NL).
396	*/
397	if (lasttoken != TNL && lasttoken != TSEMI)
398	tokpushback++;
399	}
400	checkkwd = 2;
401	if ((t = readtoken()) == TDO)
402	t = TDONE;
403	else if (t == TBEGIN)
404	t = TEND;
405	else
406	synexpect(-1);
407	n1->nfor.body = list(0);
408	if (readtoken() != t)
409	synexpect(t);
410	checkkwd = 1;
411	break;
412	case TCASE:
413	n1 = (union node *)stalloc(sizeof (struct ncase));
414	n1->type = NCASE;
415	if (readtoken() != TWORD)
416	synexpect(TWORD);
417	n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
418	n2->type = NARG;
419	n2->narg.text = wordtext;
420	n2->narg.backquote = backquotelist;
421	n2->narg.next = NULL;
422	while (readtoken() == TNL);
423	if (lasttoken != TWORD \|\| ! equal(wordtext, "in"))
424	synerror("expecting \"in\"");
425	cpp = &n1->ncase.cases;
426	noalias = 1;
427	checkkwd = 2, readtoken();
428	do {
429	cpp = cp = (union node )stalloc(sizeof (struct nclist));
430	cp->type = NCLIST;
431	app = &cp->nclist.pattern;
432	for (;;) {
433	app = ap = (union node )stalloc(sizeof (struct narg));
434	ap->type = NARG;
435	ap->narg.text = wordtext;
436	ap->narg.backquote = backquotelist;
437	if (checkkwd = 2, readtoken() != TPIPE)
438	break;
439	app = &ap->narg.next;
440	readtoken();
441	}
442	ap->narg.next = NULL;
443	noalias = 0;
444	if (lasttoken != TRP) {
445	synexpect(TRP);
446	}
447	cp->nclist.body = list(0);
448
449	checkkwd = 2;
450	if ((t = readtoken()) != TESAC) {
451	if (t != TENDCASE) {
452	noalias = 0;
453	synexpect(TENDCASE);
454	} else {
455	noalias = 1;
456	checkkwd = 2;
457	readtoken();
458	}
459	}
460	cpp = &cp->nclist.next;
461	} while(lasttoken != TESAC);
462	noalias = 0;
463	*cpp = NULL;
464	checkkwd = 1;
465	break;
466	case TLP:
467	n1 = (union node *)stalloc(sizeof (struct nredir));
468	n1->type = NSUBSHELL;
469	n1->nredir.n = list(0);
470	n1->nredir.redirect = NULL;
471	if (readtoken() != TRP)
472	synexpect(TRP);
473	checkkwd = 1;
474	break;
475	case TBEGIN:
476	n1 = list(0);
477	if (readtoken() != TEND)
478	synexpect(TEND);
479	checkkwd = 1;
480	break;
481	/* Handle an empty command like other simple commands. */
482	case TSEMI:
483	/*
484	* An empty command before a ; doesn't make much sense, and
485	* should certainly be disallowed in the case of `if ;'.
486	*/
487	if (!redir)
488	synexpect(-1);
489	case TAND:
490	case TOR:
491	case TNL:
492	case TEOF:
493	case TWORD:
494	case TRP:
495	tokpushback++;
496	n1 = simplecmd(rpp, redir);
497	goto checkneg;
498	default:
499	synexpect(-1);
500	/* NOTREACHED */
501	}
502
503	/* Now check for redirection which may follow command */
504	while (readtoken() == TREDIR) {
505	*rpp = n2 = redirnode;
506	rpp = &n2->nfile.next;
507	parsefname();
508	}
509	tokpushback++;
510	*rpp = NULL;
511	if (redir) {
512	if (n1->type != NSUBSHELL) {
513	n2 = (union node *)stalloc(sizeof (struct nredir));
514	n2->type = NREDIR;
515	n2->nredir.n = n1;
516	n1 = n2;
517	}
518	n1->nredir.redirect = redir;
519	}
520
521	checkneg:
522	if (negate) {
523	n2 = (union node *)stalloc(sizeof (struct nnot));
524	n2->type = NNOT;
525	n2->nnot.com = n1;
526	return n2;
527	}
528	else
529	return n1;
530	}
531
532
533	STATIC union node *
534	simplecmd(union node *rpp, union node redir)
535	{
536	union node args, *app;
537	union node **orig_rpp = rpp;
538	union node n = NULL, n2;
539	int negate = 0;
540
541	/* If we don't have any redirections already, then we must reset */
542	/* rpp to be the address of the local redir variable. */
543	if (redir == 0)
544	rpp = &redir;
545
546	args = NULL;
547	app = &args;
548	/*
549	* We save the incoming value, because we need this for shell
550	* functions. There can not be a redirect or an argument between
551	* the function name and the open parenthesis.
552	*/
553	orig_rpp = rpp;
554
555	while (readtoken() == TNOT) {
556	TRACE(("command: TNOT recognized\n"));
557	negate = !negate;
558	}
559	tokpushback++;
560
561	for (;;) {
562	if (readtoken() == TWORD) {
563	n = (union node *)stalloc(sizeof (struct narg));
564	n->type = NARG;
565	n->narg.text = wordtext;
566	n->narg.backquote = backquotelist;
567	*app = n;
568	app = &n->narg.next;
569	} else if (lasttoken == TREDIR) {
570	*rpp = n = redirnode;
571	rpp = &n->nfile.next;
572	parsefname(); /* read name of redirection file */
573	} else if (lasttoken == TLP && app == &args->narg.next
574	&& rpp == orig_rpp) {
575	/* We have a function */
576	if (readtoken() != TRP)
577	synexpect(TRP);
578	#ifdef notdef
579	if (! goodname(n->narg.text))
580	synerror("Bad function name");
581	#endif
582	n->type = NDEFUN;
583	n->narg.next = command();
584	goto checkneg;
585	} else {
586	tokpushback++;
587	break;
588	}
589	}
590	*app = NULL;
591	*rpp = NULL;
592	n = (union node *)stalloc(sizeof (struct ncmd));
593	n->type = NCMD;
594	n->ncmd.backgnd = 0;
595	n->ncmd.args = args;
596	n->ncmd.redirect = redir;
597
598	checkneg:
599	if (negate) {
600	n2 = (union node *)stalloc(sizeof (struct nnot));
601	n2->type = NNOT;
602	n2->nnot.com = n;
603	return n2;
604	}
605	else
606	return n;
607	}
608
609	STATIC union node *
610	makename(void)
611	{
612	union node *n;
613
614	n = (union node *)stalloc(sizeof (struct narg));
615	n->type = NARG;
616	n->narg.next = NULL;
617	n->narg.text = wordtext;
618	n->narg.backquote = backquotelist;
619	return n;
620	}
621
622	void fixredir(union node n, const char text, int err)
623	{
624	TRACE(("Fix redir %s %d\n", text, err));
625	if (!err)
626	n->ndup.vname = NULL;
627
628	if (is_digit(text[0]) && text[1] == '\0')
629	n->ndup.dupfd = digit_val(text[0]);
630	else if (text[0] == '-' && text[1] == '\0')
631	n->ndup.dupfd = -1;
632	else {
633
634	if (err)
635	synerror("Bad fd number");
636	else
637	n->ndup.vname = makename();
638	}
639	}
640
641
642	STATIC void
643	parsefname(void)
644	{
645	union node *n = redirnode;
646
647	if (readtoken() != TWORD)
648	synexpect(-1);
649	if (n->type == NHERE) {
650	struct heredoc *here = heredoc;
651	struct heredoc *p;
652	int i;
653
654	if (quoteflag == 0)
655	n->type = NXHERE;
656	TRACE(("Here document %d\n", n->type));
657	if (here->striptabs) {
658	while (*wordtext == '\t')
659	wordtext++;
660	}
661	if (! noexpand(wordtext) \|\| (i = strlen(wordtext)) == 0 \|\| i > EOFMARKLEN)
662	synerror("Illegal eof marker for << redirection");
663	rmescapes(wordtext);
664	here->eofmark = wordtext;
665	here->next = NULL;
666	if (heredoclist == NULL)
667	heredoclist = here;
668	else {
669	for (p = heredoclist ; p->next ; p = p->next);
670	p->next = here;
671	}
672	} else if (n->type == NTOFD \|\| n->type == NFROMFD) {
673	fixredir(n, wordtext, 0);
674	} else {
675	n->nfile.fname = makename();
676	}
677	}
678
679
680	/*
681	* Input any here documents.
682	*/
683
684	STATIC void
685	parseheredoc(void)
686	{
687	struct heredoc *here;
688	union node *n;
689
690	while (heredoclist) {
691	here = heredoclist;
692	heredoclist = here->next;
693	if (needprompt) {
694	setprompt(2);
695	needprompt = 0;
696	}
697	readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
698	here->eofmark, here->striptabs);
699	n = (union node *)stalloc(sizeof (struct narg));
700	n->narg.type = NARG;
701	n->narg.next = NULL;
702	n->narg.text = wordtext;
703	n->narg.backquote = backquotelist;
704	here->here->nhere.doc = n;
705	}
706	}
707
708	STATIC int
709	peektoken(void)
710	{
711	int t;
712
713	t = readtoken();
714	tokpushback++;
715	return (t);
716	}
717
718	STATIC int
719	readtoken(void)
720	{
721	int t;
722	int savecheckkwd = checkkwd;
723	#ifdef DEBUG
724	int alreadyseen = tokpushback;
725	#endif
726	struct alias *ap;
727
728	top:
729	t = xxreadtoken();
730
731	if (checkkwd) {
732	/*
733	* eat newlines
734	*/
735	if (checkkwd == 2) {
736	checkkwd = 0;
737	while (t == TNL) {
738	parseheredoc();
739	t = xxreadtoken();
740	}
741	} else
742	checkkwd = 0;
743	/*
744	* check for keywords and aliases
745	*/
746	if (t == TWORD && !quoteflag)
747	{
748	const char const pp;
749
750	for (pp = parsekwd; *pp; pp++) {
751	if (*pp == wordtext && equal(*pp, wordtext))
752	{
753	lasttoken = t = pp -
754	parsekwd + KWDOFFSET;
755	TRACE(("keyword %s recognized\n", tokname[t]));
756	goto out;
757	}
758	}
759	if(!noalias &&
760	(ap = lookupalias(wordtext, 1)) != NULL) {
761	pushstring(ap->val, strlen(ap->val), ap);
762	checkkwd = savecheckkwd;
763	goto top;
764	}
765	}
766	out:
767	checkkwd = (t == TNOT) ? savecheckkwd : 0;
768	}
769	#ifdef DEBUG
770	if (!alreadyseen)
771	TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
772	else
773	TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
774	#endif
775	return (t);
776	}
777
778
779	/*
780	* Read the next input token.
781	* If the token is a word, we set backquotelist to the list of cmds in
782	* backquotes. We set quoteflag to true if any part of the word was
783	* quoted.
784	* If the token is TREDIR, then we set redirnode to a structure containing
785	* the redirection.
786	* In all cases, the variable startlinno is set to the number of the line
787	* on which the token starts.
788	*
789	* [Change comment: here documents and internal procedures]
790	* [Readtoken shouldn't have any arguments. Perhaps we should make the
791	* word parsing code into a separate routine. In this case, readtoken
792	* doesn't need to have any internal procedures, but parseword does.
793	* We could also make parseoperator in essence the main routine, and
794	* have parseword (readtoken1?) handle both words and redirection.]
795	*/
796
797	#define RETURN(token) return lasttoken = token
798
799	STATIC int
800	xxreadtoken(void)
801	{
802	int c;
803
804	if (tokpushback) {
805	tokpushback = 0;
806	return lasttoken;
807	}
808	if (needprompt) {
809	setprompt(2);
810	needprompt = 0;
811	}
812	startlinno = plinno;
813	for (;;) { /* until token or start of word found */
814	c = pgetc_macro();
815	if (c == ' ' \|\| c == '\t')
816	continue; /* quick check for white space first */
817	switch (c) {
818	case ' ': case '\t':
819	continue;
820	case '#':
821	while ((c = pgetc()) != '\n' && c != PEOF);
822	pungetc();
823	continue;
824	case '\\':
825	if (pgetc() == '\n') {
826	startlinno = ++plinno;
827	if (doprompt)
828	setprompt(2);
829	else
830	setprompt(0);
831	continue;
832	}
833	pungetc();
834	goto breakloop;
835	case '\n':
836	plinno++;
837	needprompt = doprompt;
838	RETURN(TNL);
839	case PEOF:
840	RETURN(TEOF);
841	case '&':
842	if (pgetc() == '&')
843	RETURN(TAND);
844	pungetc();
845	RETURN(TBACKGND);
846	case '\|':
847	if (pgetc() == '\|')
848	RETURN(TOR);
849	pungetc();
850	RETURN(TPIPE);
851	case ';':
852	if (pgetc() == ';')
853	RETURN(TENDCASE);
854	pungetc();
855	RETURN(TSEMI);
856	case '(':
857	RETURN(TLP);
858	case ')':
859	RETURN(TRP);
860	default:
861	goto breakloop;
862	}
863	}
864	breakloop:
865	return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
866	#undef RETURN
867	}
868
869
870
871	/*
872	* If eofmark is NULL, read a word or a redirection symbol. If eofmark
873	* is not NULL, read a here document. In the latter case, eofmark is the
874	* word which marks the end of the document and striptabs is true if
875	* leading tabs should be stripped from the document. The argument firstc
876	* is the first character of the input token or document.
877	*
878	* Because C does not have internal subroutines, I have simulated them
879	* using goto's to implement the subroutine linkage. The following macros
880	* will run code that appears at the end of readtoken1.
881	*/
882
883	#define CHECKEND() {goto checkend; checkend_return:;}
884	#define PARSEREDIR() {goto parseredir; parseredir_return:;}
885	#define PARSESUB() {goto parsesub; parsesub_return:;}
886	#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
887	#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
888	#define PARSEARITH() {goto parsearith; parsearith_return:;}
889
890	/*
891	* Keep track of nested doublequotes in dblquote and doublequotep.
892	* We use dblquote for the first 32 levels, and we expand to a malloc'ed
893	* region for levels above that. Usually we never need to malloc.
894	* This code assumes that an int is 32 bits. We don't use uint32_t,
895	* because the rest of the code does not.
896	*/
897	#define ISDBLQUOTE() ((varnest < 32) ? (dblquote & (1 << varnest)) : \
898	(dblquotep[(varnest / 32) - 1] & (1 << (varnest % 32))))
899
900	#define SETDBLQUOTE() \
901	if (varnest < 32) \
902	dblquote \|= (1 << varnest); \
903	else \
904	dblquotep[(varnest / 32) - 1] \|= (1 << (varnest % 32))
905
906	#define CLRDBLQUOTE() \
907	if (varnest < 32) \
908	dblquote &= ~(1 << varnest); \
909	else \
910	dblquotep[(varnest / 32) - 1] &= ~(1 << (varnest % 32))
911
912	STATIC int
913	readtoken1(int firstc, char const syntax, char eofmark, int striptabs)
914	{
915	int c = firstc;
916	char *out;
917	int len;
918	char line[EOFMARKLEN + 1];
919	struct nodelist *bqlist;
920	int quotef;
921	int *dblquotep = NULL;
922	size_t maxnest = 32;
923	int dblquote;
924	int varnest; /* levels of variables expansion */
925	int arinest; /* levels of arithmetic expansion */
926	int parenlevel; /* levels of parens in arithmetic */
927	int oldstyle;
928	char const prevsyntax; / syntax before arithmetic */
929	#if __GNUC__
930	/* Avoid longjmp clobbering */
931	(void) &maxnest;
932	(void) &dblquotep;
933	(void) &out;
934	(void) &quotef;
935	(void) &dblquote;
936	(void) &varnest;
937	(void) &arinest;
938	(void) &parenlevel;
939	(void) &oldstyle;
940	(void) &prevsyntax;
941	(void) &syntax;
942	#endif
943
944	startlinno = plinno;
945	dblquote = 0;
946	varnest = 0;
947	if (syntax == DQSYNTAX) {
948	SETDBLQUOTE();
949	}
950	quotef = 0;
951	bqlist = NULL;
952	arinest = 0;
953	parenlevel = 0;
954
955	STARTSTACKSTR(out);
956	loop: { /* for each line, until end of word */
957	#if ATTY
958	if (c == '\034' && doprompt
959	&& attyset() && ! equal(termval(), "emacs")) {
960	attyline();
961	if (syntax == BASESYNTAX)
962	return readtoken();
963	c = pgetc();
964	goto loop;
965	}
966	#endif
967	CHECKEND(); /* set c to PEOF if at end of here document */
968	for (;;) { /* until end of line or end of word */
969	CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
970	switch(syntax[c]) {
971	case CNL: /* '\n' */
972	if (syntax == BASESYNTAX)
973	goto endword; /* exit outer loop */
974	USTPUTC(c, out);
975	plinno++;
976	if (doprompt)
977	setprompt(2);
978	else
979	setprompt(0);
980	c = pgetc();
981	goto loop; /* continue outer loop */
982	case CWORD:
983	USTPUTC(c, out);
984	break;
985	case CCTL:
986	if (eofmark == NULL \|\| ISDBLQUOTE())
987	USTPUTC(CTLESC, out);
988	USTPUTC(c, out);
989	break;
990	case CBACK: /* backslash */
991	c = pgetc();
992	if (c == PEOF) {
993	USTPUTC('\\', out);
994	pungetc();
995	break;
996	}
997	if (c == '\n') {
998	if (doprompt)
999	setprompt(2);
1000	else
1001	setprompt(0);
1002	break;
1003	}
1004	quotef = 1;
1005	if (ISDBLQUOTE() && c != '\\' &&
1006	c != '`' && c != '$' &&
1007	(c != '"' \|\| eofmark != NULL))
1008	USTPUTC('\\', out);
1009	if (SQSYNTAX[c] == CCTL)
1010	USTPUTC(CTLESC, out);
1011	else if (eofmark == NULL) {
1012	USTPUTC(CTLQUOTEMARK, out);
1013	USTPUTC(c, out);
1014	if (varnest != 0)
1015	USTPUTC(CTLQUOTEEND, out);
1016	break;
1017	}
1018	USTPUTC(c, out);
1019	break;
1020	case CSQUOTE:
1021	if (syntax != SQSYNTAX) {
1022	if (eofmark == NULL)
1023	USTPUTC(CTLQUOTEMARK, out);
1024	quotef = 1;
1025	syntax = SQSYNTAX;
1026	break;
1027	}
1028	if (eofmark != NULL && arinest == 0 &&
1029	varnest == 0) {
1030	/* Ignore inside quoted here document */
1031	USTPUTC(c, out);
1032	break;
1033	}
1034	/* End of single quotes... */
1035	if (arinest)
1036	syntax = ARISYNTAX;
1037	else {
1038	syntax = BASESYNTAX;
1039	if (varnest != 0)
1040	USTPUTC(CTLQUOTEEND, out);
1041	}
1042	break;
1043	case CDQUOTE:
1044	if (eofmark != NULL && arinest == 0 &&
1045	varnest == 0) {
1046	/* Ignore inside here document */
1047	USTPUTC(c, out);
1048	break;
1049	}
1050	quotef = 1;
1051	if (arinest) {
1052	if (ISDBLQUOTE()) {
1053	syntax = ARISYNTAX;
1054	CLRDBLQUOTE();
1055	} else {
1056	syntax = DQSYNTAX;
1057	SETDBLQUOTE();
1058	USTPUTC(CTLQUOTEMARK, out);
1059	}
1060	break;
1061	}
1062	if (eofmark != NULL)
1063	break;
1064	if (ISDBLQUOTE()) {
1065	if (varnest != 0)
1066	USTPUTC(CTLQUOTEEND, out);
1067	syntax = BASESYNTAX;
1068	CLRDBLQUOTE();
1069	} else {
1070	syntax = DQSYNTAX;
1071	SETDBLQUOTE();
1072	USTPUTC(CTLQUOTEMARK, out);
1073	}
1074	break;
1075	case CVAR: /* '$' */
1076	PARSESUB(); /* parse substitution */
1077	break;
1078	case CENDVAR: /* CLOSEBRACE */
1079	if (varnest > 0 && !ISDBLQUOTE()) {
1080	varnest--;
1081	USTPUTC(CTLENDVAR, out);
1082	} else {
1083	USTPUTC(c, out);
1084	}
1085	break;
1086	case CLP: /* '(' in arithmetic */
1087	parenlevel++;
1088	USTPUTC(c, out);
1089	break;
1090	case CRP: /* ')' in arithmetic */
1091	if (parenlevel > 0) {
1092	USTPUTC(c, out);
1093	--parenlevel;
1094	} else {
1095	if (pgetc() == ')') {
1096	if (--arinest == 0) {
1097	USTPUTC(CTLENDARI, out);
1098	syntax = prevsyntax;
1099	if (syntax == DQSYNTAX)
1100	SETDBLQUOTE();
1101	else
1102	CLRDBLQUOTE();
1103	} else
1104	USTPUTC(')', out);
1105	} else {
1106	/*
1107	* unbalanced parens
1108	* (don't 2nd guess - no error)
1109	*/
1110	pungetc();
1111	USTPUTC(')', out);
1112	}
1113	}
1114	break;
1115	case CBQUOTE: /* '`' */
1116	PARSEBACKQOLD();
1117	break;
1118	case CEOF:
1119	goto endword; /* exit outer loop */
1120	default:
1121	if (varnest == 0)
1122	goto endword; /* exit outer loop */
1123	USTPUTC(c, out);
1124	}
1125	c = pgetc_macro();
1126	}
1127	}
1128	endword:
1129	if (syntax == ARISYNTAX)
1130	synerror("Missing '))'");
1131	if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
1132	synerror("Unterminated quoted string");
1133	if (varnest != 0) {
1134	startlinno = plinno;
1135	/* { */
1136	synerror("Missing '}'");
1137	}
1138	USTPUTC('\0', out);
1139	len = out - stackblock();
1140	out = stackblock();
1141	if (eofmark == NULL) {
1142	if ((c == '>' \|\| c == '<')
1143	&& quotef == 0
1144	&& len <= 2
1145	&& (out == '\0' \|\| is_digit(out))) {
1146	PARSEREDIR();
1147	return lasttoken = TREDIR;
1148	} else {
1149	pungetc();
1150	}
1151	}
1152	quoteflag = quotef;
1153	backquotelist = bqlist;
1154	grabstackblock(len);
1155	wordtext = out;
1156	if (dblquotep != NULL)
1157	ckfree(dblquotep);
1158	return lasttoken = TWORD;
1159	/* end of readtoken routine */
1160
1161
1162
1163	/*
1164	* Check to see whether we are at the end of the here document. When this
1165	* is called, c is set to the first character of the next input line. If
1166	* we are at the end of the here document, this routine sets the c to PEOF.
1167	*/
1168
1169	checkend: {
1170	if (eofmark) {
1171	if (striptabs) {
1172	while (c == '\t')
1173	c = pgetc();
1174	}
1175	if (c == *eofmark) {
1176	if (pfgets(line, sizeof line) != NULL) {
1177	char p, q;
1178
1179	p = line;
1180	for (q = eofmark + 1 ; q && p == *q ; p++, q++);
1181	if (p == '\n' && q == '\0') {
1182	c = PEOF;
1183	plinno++;
1184	needprompt = doprompt;
1185	} else {
1186	pushstring(line, strlen(line), NULL);
1187	}
1188	}
1189	}
1190	}
1191	goto checkend_return;
1192	}
1193
1194
1195	/*
1196	* Parse a redirection operator. The variable "out" points to a string
1197	* specifying the fd to be redirected. The variable "c" contains the
1198	* first character of the redirection operator.
1199	*/
1200
1201	parseredir: {
1202	char fd = *out;
1203	union node *np;
1204
1205	np = (union node *)stalloc(sizeof (struct nfile));
1206	if (c == '>') {
1207	np->nfile.fd = 1;
1208	c = pgetc();
1209	if (c == '>')
1210	np->type = NAPPEND;
1211	else if (c == '\|')
1212	np->type = NCLOBBER;
1213	else if (c == '&')
1214	np->type = NTOFD;
1215	else {
1216	np->type = NTO;
1217	pungetc();
1218	}
1219	} else { /* c == '<' */
1220	np->nfile.fd = 0;
1221	switch (c = pgetc()) {
1222	case '<':
1223	if (sizeof (struct nfile) != sizeof (struct nhere)) {
1224	np = (union node *)stalloc(sizeof (struct nhere));
1225	np->nfile.fd = 0;
1226	}
1227	np->type = NHERE;
1228	heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
1229	heredoc->here = np;
1230	if ((c = pgetc()) == '-') {
1231	heredoc->striptabs = 1;
1232	} else {
1233	heredoc->striptabs = 0;
1234	pungetc();
1235	}
1236	break;
1237
1238	case '&':
1239	np->type = NFROMFD;
1240	break;
1241
1242	case '>':
1243	np->type = NFROMTO;
1244	break;
1245
1246	default:
1247	np->type = NFROM;
1248	pungetc();
1249	break;
1250	}
1251	}
1252	if (fd != '\0')
1253	np->nfile.fd = digit_val(fd);
1254	redirnode = np;
1255	goto parseredir_return;
1256	}
1257
1258
1259	/*
1260	* Parse a substitution. At this point, we have read the dollar sign
1261	* and nothing else.
1262	*/
1263
1264	parsesub: {
1265	int subtype;
1266	int typeloc;
1267	int flags;
1268	char *p;
1269	static const char types[] = "}-+?=";
1270
1271	c = pgetc();
1272	if (c != '(' && c != OPENBRACE && !is_name(c) && !is_special(c)) {
1273	USTPUTC('$', out);
1274	pungetc();
1275	} else if (c == '(') { /* $(command) or $((arith)) */
1276	if (pgetc() == '(') {
1277	PARSEARITH();
1278	} else {
1279	pungetc();
1280	PARSEBACKQNEW();
1281	}
1282	} else {
1283	USTPUTC(CTLVAR, out);
1284	typeloc = out - stackblock();
1285	USTPUTC(VSNORMAL, out);
1286	subtype = VSNORMAL;
1287	if (c == OPENBRACE) {
1288	c = pgetc();
1289	if (c == '#') {
1290	if ((c = pgetc()) == CLOSEBRACE)
1291	c = '#';
1292	else
1293	subtype = VSLENGTH;
1294	}
1295	else
1296	subtype = 0;
1297	}
1298	if (is_name(c)) {
1299	do {
1300	STPUTC(c, out);
1301	c = pgetc();
1302	} while (is_in_name(c));
1303	} else if (is_digit(c)) {
1304	do {
1305	USTPUTC(c, out);
1306	c = pgetc();
1307	} while (is_digit(c));
1308	}
1309	else if (is_special(c)) {
1310	USTPUTC(c, out);
1311	c = pgetc();
1312	}
1313	else
1314	badsub: synerror("Bad substitution");
1315
1316	STPUTC('=', out);
1317	flags = 0;
1318	if (subtype == 0) {
1319	switch (c) {
1320	case ':':
1321	flags = VSNUL;
1322	c = pgetc();
1323	/FALLTHROUGH/
1324	default:
1325	p = strchr(types, c);
1326	if (p == NULL)
1327	goto badsub;
1328	subtype = p - types + VSNORMAL;
1329	break;
1330	case '%':
1331	case '#':
1332	{
1333	int cc = c;
1334	subtype = c == '#' ? VSTRIMLEFT :
1335	VSTRIMRIGHT;
1336	c = pgetc();
1337	if (c == cc)
1338	subtype++;
1339	else
1340	pungetc();
1341	break;
1342	}
1343	}
1344	} else {
1345	pungetc();
1346	}
1347	if (ISDBLQUOTE() \|\| arinest)
1348	flags \|= VSQUOTE;
1349	*(stackblock() + typeloc) = subtype \| flags;
1350	if (subtype != VSNORMAL) {
1351	varnest++;
1352	if (varnest >= maxnest) {
1353	dblquotep = ckrealloc(dblquotep, maxnest / 8);
1354	dblquotep[(maxnest / 32) - 1] = 0;
1355	maxnest += 32;
1356	}
1357	}
1358	}
1359	goto parsesub_return;
1360	}
1361
1362
1363	/*
1364	* Called to parse command substitutions. Newstyle is set if the command
1365	* is enclosed inside $(...); nlpp is a pointer to the head of the linked
1366	* list of commands (passed by reference), and savelen is the number of
1367	* characters on the top of the stack which must be preserved.
1368	*/
1369
1370	parsebackq: {
1371	struct nodelist **nlpp;
1372	int savepbq;
1373	union node *n;
1374	char *volatile str;
1375	struct jmploc jmploc;
1376	struct jmploc *volatile savehandler;
1377	int savelen;
1378	int saveprompt;
1379	#ifdef __GNUC__
1380	(void) &saveprompt;
1381	#endif
1382
1383	savepbq = parsebackquote;
1384	if (setjmp(jmploc.loc)) {
1385	if (str)
1386	ckfree(str);
1387	parsebackquote = 0;
1388	handler = savehandler;
1389	longjmp(handler->loc, 1);
1390	}
1391	INTOFF;
1392	str = NULL;
1393	savelen = out - stackblock();
1394	if (savelen > 0) {
1395	str = ckmalloc(savelen);
1396	memcpy(str, stackblock(), savelen);
1397	}
1398	savehandler = handler;
1399	handler = &jmploc;
1400	INTON;
1401	if (oldstyle) {
1402	/* We must read until the closing backquote, giving special
1403	treatment to some slashes, and then push the string and
1404	reread it as input, interpreting it normally. */
1405	char *pout;
1406	int pc;
1407	int psavelen;
1408	char *pstr;
1409
1410
1411	STARTSTACKSTR(pout);
1412	for (;;) {
1413	if (needprompt) {
1414	setprompt(2);
1415	needprompt = 0;
1416	}
1417	switch (pc = pgetc()) {
1418	case '`':
1419	goto done;
1420
1421	case '\\':
1422	if ((pc = pgetc()) == '\n') {
1423	plinno++;
1424	if (doprompt)
1425	setprompt(2);
1426	else
1427	setprompt(0);
1428	/*
1429	* If eating a newline, avoid putting
1430	* the newline into the new character
1431	* stream (via the STPUTC after the
1432	* switch).
1433	*/
1434	continue;
1435	}
1436	if (pc != '\\' && pc != '`' && pc != '$'
1437	&& (!ISDBLQUOTE() \|\| pc != '"'))
1438	STPUTC('\\', pout);
1439	break;
1440
1441	case '\n':
1442	plinno++;
1443	needprompt = doprompt;
1444	break;
1445
1446	case PEOF:
1447	startlinno = plinno;
1448	synerror("EOF in backquote substitution");
1449	break;
1450
1451	default:
1452	break;
1453	}
1454	STPUTC(pc, pout);
1455	}
1456	done:
1457	STPUTC('\0', pout);
1458	psavelen = pout - stackblock();
1459	if (psavelen > 0) {
1460	pstr = grabstackstr(pout);
1461	setinputstring(pstr, 1);
1462	}
1463	}
1464	nlpp = &bqlist;
1465	while (*nlpp)
1466	nlpp = &(*nlpp)->next;
1467	nlpp = (struct nodelist )stalloc(sizeof (struct nodelist));
1468	(*nlpp)->next = NULL;
1469	parsebackquote = oldstyle;
1470
1471	if (oldstyle) {
1472	saveprompt = doprompt;
1473	doprompt = 0;
1474	}
1475
1476	n = list(0);
1477
1478	if (oldstyle)
1479	doprompt = saveprompt;
1480	else {
1481	if (readtoken() != TRP)
1482	synexpect(TRP);
1483	}
1484
1485	(*nlpp)->n = n;
1486	if (oldstyle) {
1487	/*
1488	* Start reading from old file again, ignoring any pushed back
1489	* tokens left from the backquote parsing
1490	*/
1491	popfile();
1492	tokpushback = 0;
1493	}
1494	while (stackblocksize() <= savelen)
1495	growstackblock();
1496	STARTSTACKSTR(out);
1497	if (str) {
1498	memcpy(out, str, savelen);
1499	STADJUST(savelen, out);
1500	INTOFF;
1501	ckfree(str);
1502	str = NULL;
1503	INTON;
1504	}
1505	parsebackquote = savepbq;
1506	handler = savehandler;
1507	if (arinest \|\| ISDBLQUOTE())
1508	USTPUTC(CTLBACKQ \| CTLQUOTE, out);
1509	else
1510	USTPUTC(CTLBACKQ, out);
1511	if (oldstyle)
1512	goto parsebackq_oldreturn;
1513	else
1514	goto parsebackq_newreturn;
1515	}
1516
1517	/*
1518	* Parse an arithmetic expansion (indicate start of one and set state)
1519	*/
1520	parsearith: {
1521
1522	if (++arinest == 1) {
1523	prevsyntax = syntax;
1524	syntax = ARISYNTAX;
1525	USTPUTC(CTLARI, out);
1526	if (ISDBLQUOTE())
1527	USTPUTC('"',out);
1528	else
1529	USTPUTC(' ',out);
1530	} else {
1531	/*
1532	* we collapse embedded arithmetic expansion to
1533	* parenthesis, which should be equivalent
1534	*/
1535	USTPUTC('(', out);
1536	}
1537	goto parsearith_return;
1538	}
1539
1540	} /* end of readtoken */
1541
1542
1543
1544	#ifdef mkinit
1545	RESET {
1546	tokpushback = 0;
1547	checkkwd = 0;
1548	}
1549	#endif
1550
1551	/*
1552	* Returns true if the text contains nothing to expand (no dollar signs
1553	* or backquotes).
1554	*/
1555
1556	STATIC int
1557	noexpand(char *text)
1558	{
1559	char *p;
1560	char c;
1561
1562	p = text;
1563	while ((c = *p++) != '\0') {
1564	if (c == CTLQUOTEMARK)
1565	continue;
1566	if (c == CTLESC)
1567	p++;
1568	else if (BASESYNTAX[(int)c] == CCTL)
1569	return 0;
1570	}
1571	return 1;
1572	}
1573
1574
1575	/*
1576	* Return true if the argument is a legal variable name (a letter or
1577	* underscore followed by zero or more letters, underscores, and digits).
1578	*/
1579
1580	int
1581	goodname(char *name)
1582	{
1583	char *p;
1584
1585	p = name;
1586	if (! is_name(*p))
1587	return 0;
1588	while (*++p) {
1589	if (! is_in_name(*p))
1590	return 0;
1591	}
1592	return 1;
1593	}
1594
1595
1596	/*
1597	* Called when an unexpected token is read during the parse. The argument
1598	* is the token that is expected, or -1 if more than one type of token can
1599	* occur at this point.
1600	*/
1601
1602	STATIC void
1603	synexpect(int token)
1604	{
1605	char msg[64];
1606
1607	if (token >= 0) {
1608	fmtstr(msg, 64, "%s unexpected (expecting %s)",
1609	tokname[lasttoken], tokname[token]);
1610	} else {
1611	fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
1612	}
1613	synerror(msg);
1614	/* NOTREACHED */
1615	}
1616
1617
1618	STATIC void
1619	synerror(const char *msg)
1620	{
1621	if (commandname)
1622	outfmt(&errout, "%s: %d: ", commandname, startlinno);
1623	outfmt(&errout, "Syntax error: %s\n", msg);
1624	error((char *)NULL);
1625	/* NOTREACHED */
1626	}
1627
1628	STATIC void
1629	setprompt(int which)
1630	{
1631	whichprompt = which;
1632
1633	#ifndef SMALL
1634	if (!el)
1635	#endif
1636	out2str(getprompt(NULL));
1637	}
1638
1639	/*
1640	* called by editline -- any expansions to the prompt
1641	* should be added here.
1642	*/
1643	const char *
1644	getprompt(void *unused)
1645	{
1646	switch (whichprompt) {
1647	case 0:
1648	return "";
1649	case 1:
1650	return ps1val();
1651	case 2:
1652	return ps2val();
1653	default:
1654	return "<internal prompt error>";
1655	}
1656	}

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source: kBuild/trunk/src/ash/parser.c@ 2017

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