2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)parser.c 8.7 (Berkeley) 5/16/95
37 * $FreeBSD: src/bin/sh/parser.c,v 1.29.2.9 2002/10/18 11:24:04 tjr Exp $
38 * $DragonFly: src/bin/sh/parser.c,v 1.8 2006/09/28 22:29:44 pavalos Exp $
46 #include "expand.h" /* defines rmescapes() */
47 #include "redir.h" /* defines copyfd() */
60 #include "myhistedit.h"
64 * Shell command parser.
69 /* values returned by readtoken */
75 struct heredoc *next; /* next here document in list */
76 union node *here; /* redirection node */
77 char *eofmark; /* string indicating end of input */
78 int striptabs; /* if set, strip leading tabs */
83 STATIC struct heredoc *heredoclist; /* list of here documents to read */
84 STATIC int parsebackquote; /* nonzero if we are inside backquotes */
85 STATIC int doprompt; /* if set, prompt the user */
86 STATIC int needprompt; /* true if interactive and at start of line */
87 STATIC int lasttoken; /* last token read */
88 MKINIT int tokpushback; /* last token pushed back */
89 STATIC char *wordtext; /* text of last word returned by readtoken */
90 MKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
91 STATIC struct nodelist *backquotelist;
92 STATIC union node *redirnode;
93 STATIC struct heredoc *heredoc;
94 STATIC int quoteflag; /* set if (part of) last token was quoted */
95 STATIC int startlinno; /* line # where last token started */
97 /* XXX When 'noaliases' is set to one, no alias expansion takes place. */
98 static int noaliases = 0;
100 STATIC union node *list(int);
101 STATIC union node *andor(void);
102 STATIC union node *pipeline(void);
103 STATIC union node *command(void);
104 STATIC union node *simplecmd(union node **, union node *);
105 STATIC union node *makename(void);
106 STATIC void parsefname(void);
107 STATIC void parseheredoc(void);
108 STATIC int peektoken(void);
109 STATIC int readtoken(void);
110 STATIC int xxreadtoken(void);
111 STATIC int readtoken1(int, char const *, char *, int);
112 STATIC int noexpand(char *);
113 STATIC void synexpect(int);
114 STATIC void synerror(const char *);
115 STATIC void setprompt(int);
119 * Read and parse a command. Returns NEOF on end of file. (NULL is a
120 * valid parse tree indicating a blank line.)
124 parsecmd(int interact)
148 union node *n1, *n2, *n3;
152 if (nlflag == 0 && tokendlist[peektoken()])
158 if (tok == TBACKGND) {
159 if (n2->type == NCMD || n2->type == NPIPE) {
160 n2->ncmd.backgnd = 1;
161 } else if (n2->type == NREDIR) {
164 n3 = (union node *)stalloc(sizeof (struct nredir));
167 n3->nredir.redirect = NULL;
175 n3 = (union node *)stalloc(sizeof (struct nbinary));
177 n3->nbinary.ch1 = n1;
178 n3->nbinary.ch2 = n2;
195 if (tokendlist[peektoken()])
202 pungetc(); /* push back EOF on input */
218 union node *n1, *n2, *n3;
223 if ((t = readtoken()) == TAND) {
225 } else if (t == TOR) {
232 n3 = (union node *)stalloc(sizeof (struct nbinary));
234 n3->nbinary.ch1 = n1;
235 n3->nbinary.ch2 = n2;
245 union node *n1, *n2, *pipenode;
246 struct nodelist *lp, *prev;
250 TRACE(("pipeline: entered\n"));
251 while (readtoken() == TNOT)
255 if (readtoken() == TPIPE) {
256 pipenode = (union node *)stalloc(sizeof (struct npipe));
257 pipenode->type = NPIPE;
258 pipenode->npipe.backgnd = 0;
259 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
260 pipenode->npipe.cmdlist = lp;
264 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
267 } while (readtoken() == TPIPE);
273 n2 = (union node *)stalloc(sizeof (struct nnot));
287 union node *ap, **app;
288 union node *cp, **cpp;
289 union node *redir, **rpp;
297 /* Check for redirection which may precede command */
298 while (readtoken() == TREDIR) {
299 *rpp = n2 = redirnode;
300 rpp = &n2->nfile.next;
305 while (readtoken() == TNOT) {
306 TRACE(("command: TNOT recognized\n"));
311 switch (readtoken()) {
313 n1 = (union node *)stalloc(sizeof (struct nif));
315 n1->nif.test = list(0);
316 if (readtoken() != TTHEN)
318 n1->nif.ifpart = list(0);
320 while (readtoken() == TELIF) {
321 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
322 n2 = n2->nif.elsepart;
324 n2->nif.test = list(0);
325 if (readtoken() != TTHEN)
327 n2->nif.ifpart = list(0);
329 if (lasttoken == TELSE)
330 n2->nif.elsepart = list(0);
332 n2->nif.elsepart = NULL;
335 if (readtoken() != TFI)
342 n1 = (union node *)stalloc(sizeof (struct nbinary));
343 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
344 n1->nbinary.ch1 = list(0);
345 if ((got=readtoken()) != TDO) {
346 TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : ""));
349 n1->nbinary.ch2 = list(0);
350 if (readtoken() != TDONE)
356 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
357 synerror("Bad for loop variable");
358 n1 = (union node *)stalloc(sizeof (struct nfor));
360 n1->nfor.var = wordtext;
361 if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) {
363 while (readtoken() == TWORD) {
364 n2 = (union node *)stalloc(sizeof (struct narg));
366 n2->narg.text = wordtext;
367 n2->narg.backquote = backquotelist;
369 app = &n2->narg.next;
373 if (lasttoken != TNL && lasttoken != TSEMI)
376 static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'};
377 n2 = (union node *)stalloc(sizeof (struct narg));
379 n2->narg.text = argvars;
380 n2->narg.backquote = NULL;
381 n2->narg.next = NULL;
384 * Newline or semicolon here is optional (but note
385 * that the original Bourne shell only allowed NL).
387 if (lasttoken != TNL && lasttoken != TSEMI)
391 if ((t = readtoken()) == TDO)
393 else if (t == TBEGIN)
397 n1->nfor.body = list(0);
398 if (readtoken() != t)
403 n1 = (union node *)stalloc(sizeof (struct ncase));
405 if (readtoken() != TWORD)
407 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
409 n2->narg.text = wordtext;
410 n2->narg.backquote = backquotelist;
411 n2->narg.next = NULL;
412 while (readtoken() == TNL);
413 if (lasttoken != TWORD || ! equal(wordtext, "in"))
414 synerror("expecting \"in\"");
415 cpp = &n1->ncase.cases;
416 noaliases = 1; /* turn off alias expansion */
417 checkkwd = 2, readtoken();
418 while (lasttoken != TESAC) {
419 *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
421 app = &cp->nclist.pattern;
422 if (lasttoken == TLP)
425 *app = ap = (union node *)stalloc(sizeof (struct narg));
427 ap->narg.text = wordtext;
428 ap->narg.backquote = backquotelist;
429 if (checkkwd = 2, readtoken() != TPIPE)
431 app = &ap->narg.next;
434 ap->narg.next = NULL;
435 if (lasttoken != TRP)
436 noaliases = 0, synexpect(TRP);
437 cp->nclist.body = list(0);
440 if ((t = readtoken()) != TESAC) {
442 noaliases = 0, synexpect(TENDCASE);
444 checkkwd = 2, readtoken();
446 cpp = &cp->nclist.next;
448 noaliases = 0; /* reset alias expansion */
453 n1 = (union node *)stalloc(sizeof (struct nredir));
454 n1->type = NSUBSHELL;
455 n1->nredir.n = list(0);
456 n1->nredir.redirect = NULL;
457 if (readtoken() != TRP)
463 if (readtoken() != TEND)
467 /* Handle an empty command like other simple commands. */
472 * An empty command before a ; doesn't make much sense, and
473 * should certainly be disallowed in the case of `if ;'.
482 n1 = simplecmd(rpp, redir);
488 /* Now check for redirection which may follow command */
489 while (readtoken() == TREDIR) {
490 *rpp = n2 = redirnode;
491 rpp = &n2->nfile.next;
497 if (n1->type != NSUBSHELL) {
498 n2 = (union node *)stalloc(sizeof (struct nredir));
503 n1->nredir.redirect = redir;
508 n2 = (union node *)stalloc(sizeof (struct nnot));
519 simplecmd(union node **rpp, union node *redir)
521 union node *args, **app;
522 union node **orig_rpp = rpp;
523 union node *n = NULL, *n2;
526 /* If we don't have any redirections already, then we must reset */
527 /* rpp to be the address of the local redir variable. */
534 * We save the incoming value, because we need this for shell
535 * functions. There can not be a redirect or an argument between
536 * the function name and the open parenthesis.
540 while (readtoken() == TNOT) {
541 TRACE(("command: TNOT recognized\n"));
547 if (readtoken() == TWORD) {
548 n = (union node *)stalloc(sizeof (struct narg));
550 n->narg.text = wordtext;
551 n->narg.backquote = backquotelist;
554 } else if (lasttoken == TREDIR) {
555 *rpp = n = redirnode;
556 rpp = &n->nfile.next;
557 parsefname(); /* read name of redirection file */
558 } else if (lasttoken == TLP && app == &args->narg.next
559 && rpp == orig_rpp) {
560 /* We have a function */
561 if (readtoken() != TRP)
564 if (! goodname(n->narg.text))
565 synerror("Bad function name");
568 n->narg.next = command();
577 n = (union node *)stalloc(sizeof (struct ncmd));
581 n->ncmd.redirect = redir;
585 n2 = (union node *)stalloc(sizeof (struct nnot));
599 n = (union node *)stalloc(sizeof (struct narg));
602 n->narg.text = wordtext;
603 n->narg.backquote = backquotelist;
608 fixredir(union node *n, const char *text, int err)
610 TRACE(("Fix redir %s %d\n", text, err));
612 n->ndup.vname = NULL;
614 if (is_digit(text[0]) && text[1] == '\0')
615 n->ndup.dupfd = digit_val(text[0]);
616 else if (text[0] == '-' && text[1] == '\0')
621 synerror("Bad fd number");
623 n->ndup.vname = makename();
631 union node *n = redirnode;
633 if (readtoken() != TWORD)
635 if (n->type == NHERE) {
636 struct heredoc *here = heredoc;
642 TRACE(("Here document %d\n", n->type));
643 if (here->striptabs) {
644 while (*wordtext == '\t')
647 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
648 synerror("Illegal eof marker for << redirection");
650 here->eofmark = wordtext;
652 if (heredoclist == NULL)
655 for (p = heredoclist ; p->next ; p = p->next);
658 } else if (n->type == NTOFD || n->type == NFROMFD) {
659 fixredir(n, wordtext, 0);
661 n->nfile.fname = makename();
667 * Input any here documents.
673 struct heredoc *here;
676 while (heredoclist) {
678 heredoclist = here->next;
683 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
684 here->eofmark, here->striptabs);
685 n = (union node *)stalloc(sizeof (struct narg));
688 n->narg.text = wordtext;
689 n->narg.backquote = backquotelist;
690 here->here->nhere.doc = n;
708 int savecheckkwd = checkkwd;
711 int alreadyseen = tokpushback;
730 * check for keywords and aliases
732 if (t == TWORD && !quoteflag)
734 const char * const *pp;
736 for (pp = parsekwd; *pp; pp++) {
737 if (**pp == *wordtext && equal(*pp, wordtext))
739 lasttoken = t = pp - parsekwd + KWDOFFSET;
740 TRACE(("keyword %s recognized\n", tokname[t]));
744 if (noaliases == 0 &&
745 (ap = lookupalias(wordtext, 1)) != NULL) {
746 pushstring(ap->val, strlen(ap->val), ap);
747 checkkwd = savecheckkwd;
752 checkkwd = (t == TNOT) ? savecheckkwd : 0;
756 TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
758 TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
765 * Read the next input token.
766 * If the token is a word, we set backquotelist to the list of cmds in
767 * backquotes. We set quoteflag to true if any part of the word was
769 * If the token is TREDIR, then we set redirnode to a structure containing
771 * In all cases, the variable startlinno is set to the number of the line
772 * on which the token starts.
774 * [Change comment: here documents and internal procedures]
775 * [Readtoken shouldn't have any arguments. Perhaps we should make the
776 * word parsing code into a separate routine. In this case, readtoken
777 * doesn't need to have any internal procedures, but parseword does.
778 * We could also make parseoperator in essence the main routine, and
779 * have parseword (readtoken1?) handle both words and redirection.]
782 #define RETURN(token) return lasttoken = token
798 for (;;) { /* until token or start of word found */
800 if (c == ' ' || c == '\t')
801 continue; /* quick check for white space first */
806 while ((c = pgetc()) != '\n' && c != PEOF);
810 if (pgetc() == '\n') {
811 startlinno = ++plinno;
822 needprompt = doprompt;
850 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
857 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
858 * is not NULL, read a here document. In the latter case, eofmark is the
859 * word which marks the end of the document and striptabs is true if
860 * leading tabs should be stripped from the document. The argument firstc
861 * is the first character of the input token or document.
863 * Because C does not have internal subroutines, I have simulated them
864 * using goto's to implement the subroutine linkage. The following macros
865 * will run code that appears at the end of readtoken1.
868 #define CHECKEND() {goto checkend; checkend_return:;}
869 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
870 #define PARSESUB() {goto parsesub; parsesub_return:;}
871 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
872 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
873 #define PARSEARITH() {goto parsearith; parsearith_return:;}
876 readtoken1(int firstc, char const *syntax, char *eofmark, int striptabs)
881 char line[EOFMARKLEN + 1];
882 struct nodelist *bqlist;
885 int varnest; /* levels of variables expansion */
886 int arinest; /* levels of arithmetic expansion */
887 int parenlevel; /* levels of parens in arithmetic */
889 char const *prevsyntax; /* syntax before arithmetic */
892 /* Avoid longjmp clobbering */
907 if (syntax == DQSYNTAX)
916 loop: { /* for each line, until end of word */
917 CHECKEND(); /* set c to PEOF if at end of here document */
918 for (;;) { /* until end of line or end of word */
919 CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
921 synentry = syntax[c];
925 if (syntax == BASESYNTAX)
926 goto endword; /* exit outer loop */
934 goto loop; /* continue outer loop */
939 if (eofmark == NULL || dblquote)
940 USTPUTC(CTLESC, out);
943 case CBACK: /* backslash */
948 } else if (c == '\n') {
954 if (dblquote && c != '\\' &&
955 c != '`' && c != '$' &&
956 (c != '"' || eofmark != NULL))
958 if (SQSYNTAX[c] == CCTL)
959 USTPUTC(CTLESC, out);
960 else if (eofmark == NULL)
961 USTPUTC(CTLQUOTEMARK, out);
968 USTPUTC(CTLQUOTEMARK, out);
973 USTPUTC(CTLQUOTEMARK, out);
978 if (eofmark != NULL && arinest == 0 &&
985 } else if (eofmark == NULL) {
993 PARSESUB(); /* parse substitution */
995 case CENDVAR: /* '}' */
998 USTPUTC(CTLENDVAR, out);
1003 case CLP: /* '(' in arithmetic */
1007 case CRP: /* ')' in arithmetic */
1008 if (parenlevel > 0) {
1012 if (pgetc() == ')') {
1013 if (--arinest == 0) {
1014 USTPUTC(CTLENDARI, out);
1015 syntax = prevsyntax;
1016 if (syntax == DQSYNTAX)
1025 * (don't 2nd guess - no error)
1032 case CBQUOTE: /* '`' */
1036 goto endword; /* exit outer loop */
1039 goto endword; /* exit outer loop */
1046 if (syntax == ARISYNTAX)
1047 synerror("Missing '))'");
1048 if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
1049 synerror("Unterminated quoted string");
1051 startlinno = plinno;
1052 synerror("Missing '}'");
1055 len = out - stackblock();
1057 if (eofmark == NULL) {
1058 if ((c == '>' || c == '<')
1061 && (*out == '\0' || is_digit(*out))) {
1063 return lasttoken = TREDIR;
1069 backquotelist = bqlist;
1070 grabstackblock(len);
1072 return lasttoken = TWORD;
1073 /* end of readtoken routine */
1078 * Check to see whether we are at the end of the here document. When this
1079 * is called, c is set to the first character of the next input line. If
1080 * we are at the end of the here document, this routine sets the c to PEOF.
1089 if (c == *eofmark) {
1090 if (pfgets(line, sizeof line) != NULL) {
1094 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
1095 if (*p == '\n' && *q == '\0') {
1098 needprompt = doprompt;
1100 pushstring(line, strlen(line), NULL);
1105 goto checkend_return;
1110 * Parse a redirection operator. The variable "out" points to a string
1111 * specifying the fd to be redirected. The variable "c" contains the
1112 * first character of the redirection operator.
1119 np = (union node *)stalloc(sizeof (struct nfile));
1128 np->type = NCLOBBER;
1133 } else { /* c == '<' */
1137 if (sizeof (struct nfile) != sizeof (struct nhere)) {
1138 np = (union node *)stalloc(sizeof (struct nhere));
1142 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
1144 if ((c = pgetc()) == '-') {
1145 heredoc->striptabs = 1;
1147 heredoc->striptabs = 0;
1150 } else if (c == '&')
1160 np->nfile.fd = digit_val(fd);
1162 goto parseredir_return;
1167 * Parse a substitution. At this point, we have read the dollar sign
1176 static const char types[] = "}-+?=";
1177 int bracketed_name = 0; /* used to handle ${[0-9]*} variables */
1180 if (c != '(' && c != '{' && (is_eof(c) || !is_name(c)) &&
1184 } else if (c == '(') { /* $(command) or $((arith)) */
1185 if (pgetc() == '(') {
1192 USTPUTC(CTLVAR, out);
1193 typeloc = out - stackblock();
1194 USTPUTC(VSNORMAL, out);
1200 if ((c = pgetc()) == '}')
1208 if (!is_eof(c) && is_name(c)) {
1212 } while (!is_eof(c) && is_in_name(c));
1213 } else if (is_digit(c)) {
1214 if (bracketed_name) {
1218 } while (is_digit(c));
1224 if (! is_special(c))
1225 badsub: synerror("Bad substitution");
1238 p = strchr(types, c);
1241 subtype = p - types + VSNORMAL;
1247 subtype = c == '#' ? VSTRIMLEFT :
1260 if (subtype != VSLENGTH && (dblquote || arinest))
1262 *(stackblock() + typeloc) = subtype | flags;
1263 if (subtype != VSNORMAL)
1266 goto parsesub_return;
1271 * Called to parse command substitutions. Newstyle is set if the command
1272 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
1273 * list of commands (passed by reference), and savelen is the number of
1274 * characters on the top of the stack which must be preserved.
1278 struct nodelist **nlpp;
1282 struct jmploc jmploc;
1283 struct jmploc *volatile savehandler;
1287 /* Avoid longjmp clobbering */
1291 savepbq = parsebackquote;
1292 if (setjmp(jmploc.loc)) {
1296 handler = savehandler;
1297 longjmp(handler->loc, 1);
1301 savelen = out - stackblock();
1303 str = ckmalloc(savelen);
1304 memcpy(str, stackblock(), savelen);
1306 savehandler = handler;
1310 /* We must read until the closing backquote, giving special
1311 treatment to some slashes, and then push the string and
1312 reread it as input, interpreting it normally. */
1319 STARTSTACKSTR(pout);
1325 switch (pc = pgetc()) {
1330 if ((pc = pgetc()) == '\n') {
1337 * If eating a newline, avoid putting
1338 * the newline into the new character
1339 * stream (via the STPUTC after the
1344 if (pc != '\\' && pc != '`' && pc != '$'
1345 && (!dblquote || pc != '"'))
1351 needprompt = doprompt;
1355 startlinno = plinno;
1356 synerror("EOF in backquote substitution");
1366 psavelen = pout - stackblock();
1368 pstr = ckmalloc(psavelen);
1369 memcpy(pstr, stackblock(), psavelen);
1370 setinputstring(pstr, 1);
1375 nlpp = &(*nlpp)->next;
1376 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
1377 (*nlpp)->next = NULL;
1378 parsebackquote = oldstyle;
1381 saveprompt = doprompt;
1388 doprompt = saveprompt;
1390 if (readtoken() != TRP)
1397 * Start reading from old file again, ignoring any pushed back
1398 * tokens left from the backquote parsing
1403 while (stackblocksize() <= savelen)
1407 memcpy(out, str, savelen);
1408 STADJUST(savelen, out);
1414 parsebackquote = savepbq;
1415 handler = savehandler;
1416 if (arinest || dblquote)
1417 USTPUTC(CTLBACKQ | CTLQUOTE, out);
1419 USTPUTC(CTLBACKQ, out);
1421 goto parsebackq_oldreturn;
1423 goto parsebackq_newreturn;
1427 * Parse an arithmetic expansion (indicate start of one and set state)
1431 if (++arinest == 1) {
1432 prevsyntax = syntax;
1434 USTPUTC(CTLARI, out);
1441 * we collapse embedded arithmetic expansion to
1442 * parenthesis, which should be equivalent
1446 goto parsearith_return;
1449 } /* end of readtoken */
1461 * Returns true if the text contains nothing to expand (no dollar signs
1466 noexpand(char *text)
1472 while ((c = *p++) != '\0') {
1473 if ( c == CTLQUOTEMARK)
1477 else if (BASESYNTAX[(int)c] == CCTL)
1485 * Return true if the argument is a legal variable name (a letter or
1486 * underscore followed by zero or more letters, underscores, and digits).
1490 goodname(char *name)
1498 if (! is_in_name(*p))
1506 * Called when an unexpected token is read during the parse. The argument
1507 * is the token that is expected, or -1 if more than one type of token can
1508 * occur at this point.
1512 synexpect(int token)
1517 fmtstr(msg, 64, "%s unexpected (expecting %s)",
1518 tokname[lasttoken], tokname[token]);
1520 fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
1527 synerror(const char *msg)
1530 outfmt(&errout, "%s: %d: ", commandname, startlinno);
1531 outfmt(&errout, "Syntax error: %s\n", msg);
1532 error((char *)NULL);
1536 setprompt(int which)
1538 whichprompt = which;
1543 out2str(getprompt(NULL));
1547 * called by editline -- any expansions to the prompt
1548 * should be added here.
1551 getprompt(void *unused __unused)
1553 switch (whichprompt) {
1561 return "<internal prompt error>";