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 1.58 2006/11/05 18:36:05 stefanf Exp $
38 * $DragonFly: src/bin/sh/parser.c,v 1.12 2007/01/18 17:03:18 corecode Exp $
48 #include "expand.h" /* defines rmescapes() */
61 #include "myhistedit.h"
65 * Shell command parser.
71 /* values returned by readtoken */
77 struct heredoc
*next
; /* next here document in list */
78 union node
*here
; /* redirection node */
79 char *eofmark
; /* string indicating end of input */
80 int striptabs
; /* if set, strip leading tabs */
85 STATIC
struct heredoc
*heredoclist
; /* list of here documents to read */
86 STATIC
int parsebackquote
; /* nonzero if we are inside backquotes */
87 STATIC
int doprompt
; /* if set, prompt the user */
88 STATIC
int needprompt
; /* true if interactive and at start of line */
89 STATIC
int lasttoken
; /* last token read */
90 MKINIT
int tokpushback
; /* last token pushed back */
91 STATIC
char *wordtext
; /* text of last word returned by readtoken */
94 * 2 == also eat newlines
98 STATIC
struct nodelist
*backquotelist
;
99 STATIC
union node
*redirnode
;
100 STATIC
struct heredoc
*heredoc
;
101 STATIC
int quoteflag
; /* set if (part of) last token was quoted */
102 STATIC
int startlinno
; /* line # where last token started */
103 STATIC
int funclinno
; /* line # where the current function started */
105 /* XXX When 'noaliases' is set to one, no alias expansion takes place. */
106 static int noaliases
= 0;
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);
123 STATIC
void synerror(const char *);
124 STATIC
void setprompt(int);
128 * Read and parse a command. Returns NEOF on end of file. (NULL is a
129 * valid parse tree indicating a blank line.)
133 parsecmd(int interact
)
157 union node
*n1
, *n2
, *n3
;
161 if (nlflag
== 0 && tokendlist
[peektoken()])
167 if (tok
== TBACKGND
) {
168 if (n2
->type
== NCMD
|| n2
->type
== NPIPE
) {
169 n2
->ncmd
.backgnd
= 1;
170 } else if (n2
->type
== NREDIR
) {
173 n3
= (union node
*)stalloc(sizeof (struct nredir
));
176 n3
->nredir
.redirect
= NULL
;
184 n3
= (union node
*)stalloc(sizeof (struct nbinary
));
186 n3
->nbinary
.ch1
= n1
;
187 n3
->nbinary
.ch2
= n2
;
204 if (tokendlist
[peektoken()])
211 pungetc(); /* push back EOF on input */
227 union node
*n1
, *n2
, *n3
;
232 if ((t
= readtoken()) == TAND
) {
234 } else if (t
== TOR
) {
241 n3
= (union node
*)stalloc(sizeof (struct nbinary
));
243 n3
->nbinary
.ch1
= n1
;
244 n3
->nbinary
.ch2
= n2
;
254 union node
*n1
, *n2
, *pipenode
;
255 struct nodelist
*lp
, *prev
;
259 TRACE(("pipeline: entered\n"));
262 while (readtoken() == TNOT
)
267 if (readtoken() == TPIPE
) {
268 pipenode
= (union node
*)stalloc(sizeof (struct npipe
));
269 pipenode
->type
= NPIPE
;
270 pipenode
->npipe
.backgnd
= 0;
271 lp
= (struct nodelist
*)stalloc(sizeof (struct nodelist
));
272 pipenode
->npipe
.cmdlist
= lp
;
278 while (readtoken() == TNOT
)
279 innernegate
= !innernegate
;
283 lp
= (struct nodelist
*)stalloc(sizeof (struct nodelist
));
288 n2
= (union node
*)stalloc(sizeof (struct nnot
));
290 n2
->nnot
.com
= lp
->n
;
293 } while (readtoken() == TPIPE
);
299 n2
= (union node
*)stalloc(sizeof (struct nnot
));
313 union node
*ap
, **app
;
314 union node
*cp
, **cpp
;
315 union node
*redir
, **rpp
;
323 /* Check for redirection which may precede command */
324 while (readtoken() == TREDIR
) {
325 *rpp
= n2
= redirnode
;
326 rpp
= &n2
->nfile
.next
;
331 switch (readtoken()) {
333 n1
= (union node
*)stalloc(sizeof (struct nif
));
335 if ((n1
->nif
.test
= list(0)) == NULL
)
337 if (readtoken() != TTHEN
)
339 n1
->nif
.ifpart
= list(0);
341 while (readtoken() == TELIF
) {
342 n2
->nif
.elsepart
= (union node
*)stalloc(sizeof (struct nif
));
343 n2
= n2
->nif
.elsepart
;
345 if ((n2
->nif
.test
= list(0)) == NULL
)
347 if (readtoken() != TTHEN
)
349 n2
->nif
.ifpart
= list(0);
351 if (lasttoken
== TELSE
)
352 n2
->nif
.elsepart
= list(0);
354 n2
->nif
.elsepart
= NULL
;
357 if (readtoken() != TFI
)
364 n1
= (union node
*)stalloc(sizeof (struct nbinary
));
365 n1
->type
= (lasttoken
== TWHILE
)? NWHILE
: NUNTIL
;
366 if ((n1
->nbinary
.ch1
= list(0)) == NULL
)
368 if ((got
=readtoken()) != TDO
) {
369 TRACE(("expecting DO got %s %s\n", tokname
[got
], got
== TWORD
? wordtext
: ""));
372 n1
->nbinary
.ch2
= list(0);
373 if (readtoken() != TDONE
)
379 if (readtoken() != TWORD
|| quoteflag
|| ! goodname(wordtext
))
380 synerror("Bad for loop variable");
381 n1
= (union node
*)stalloc(sizeof (struct nfor
));
383 n1
->nfor
.var
= wordtext
;
384 if (readtoken() == TWORD
&& ! quoteflag
&& equal(wordtext
, "in")) {
386 while (readtoken() == TWORD
) {
387 n2
= (union node
*)stalloc(sizeof (struct narg
));
389 n2
->narg
.text
= wordtext
;
390 n2
->narg
.backquote
= backquotelist
;
392 app
= &n2
->narg
.next
;
396 if (lasttoken
!= TNL
&& lasttoken
!= TSEMI
)
399 static char argvars
[5] = {
400 CTLVAR
, VSNORMAL
|VSQUOTE
, '@', '=', '\0'
402 n2
= (union node
*)stalloc(sizeof (struct narg
));
404 n2
->narg
.text
= argvars
;
405 n2
->narg
.backquote
= NULL
;
406 n2
->narg
.next
= NULL
;
409 * Newline or semicolon here is optional (but note
410 * that the original Bourne shell only allowed NL).
412 if (lasttoken
!= TNL
&& lasttoken
!= TSEMI
)
416 if ((t
= readtoken()) == TDO
)
418 else if (t
== TBEGIN
)
422 n1
->nfor
.body
= list(0);
423 if (readtoken() != t
)
428 n1
= (union node
*)stalloc(sizeof (struct ncase
));
430 if (readtoken() != TWORD
)
432 n1
->ncase
.expr
= n2
= (union node
*)stalloc(sizeof (struct narg
));
434 n2
->narg
.text
= wordtext
;
435 n2
->narg
.backquote
= backquotelist
;
436 n2
->narg
.next
= NULL
;
437 while (readtoken() == TNL
);
438 if (lasttoken
!= TWORD
|| ! equal(wordtext
, "in"))
439 synerror("expecting \"in\"");
440 cpp
= &n1
->ncase
.cases
;
441 noaliases
= 1; /* turn off alias expansion */
442 checkkwd
= 2, readtoken();
443 while (lasttoken
!= TESAC
) {
444 *cpp
= cp
= (union node
*)stalloc(sizeof (struct nclist
));
446 app
= &cp
->nclist
.pattern
;
447 if (lasttoken
== TLP
)
450 *app
= ap
= (union node
*)stalloc(sizeof (struct narg
));
452 ap
->narg
.text
= wordtext
;
453 ap
->narg
.backquote
= backquotelist
;
454 if (checkkwd
= 2, readtoken() != TPIPE
)
456 app
= &ap
->narg
.next
;
459 ap
->narg
.next
= NULL
;
460 if (lasttoken
!= TRP
)
461 noaliases
= 0, synexpect(TRP
);
462 cp
->nclist
.body
= list(0);
465 if ((t
= readtoken()) != TESAC
) {
467 noaliases
= 0, synexpect(TENDCASE
);
469 checkkwd
= 2, readtoken();
471 cpp
= &cp
->nclist
.next
;
473 noaliases
= 0; /* reset alias expansion */
478 n1
= (union node
*)stalloc(sizeof (struct nredir
));
479 n1
->type
= NSUBSHELL
;
480 n1
->nredir
.n
= list(0);
481 n1
->nredir
.redirect
= NULL
;
482 if (readtoken() != TRP
)
488 if (readtoken() != TEND
)
492 /* Handle an empty command like other simple commands. */
497 * An empty command before a ; doesn't make much sense, and
498 * should certainly be disallowed in the case of `if ;'.
507 return simplecmd(rpp
, redir
);
512 /* Now check for redirection which may follow command */
513 while (readtoken() == TREDIR
) {
514 *rpp
= n2
= redirnode
;
515 rpp
= &n2
->nfile
.next
;
521 if (n1
->type
!= NSUBSHELL
) {
522 n2
= (union node
*)stalloc(sizeof (struct nredir
));
527 n1
->nredir
.redirect
= redir
;
534 simplecmd(union node
**rpp
, union node
*redir
)
536 union node
*args
, **app
;
537 union node
**orig_rpp
= rpp
;
538 union node
*n
= NULL
;
540 /* If we don't have any redirections already, then we must reset */
541 /* rpp to be the address of the local redir variable. */
548 * We save the incoming value, because we need this for shell
549 * functions. There can not be a redirect or an argument between
550 * the function name and the open parenthesis.
555 if (readtoken() == TWORD
) {
556 n
= (union node
*)stalloc(sizeof (struct narg
));
558 n
->narg
.text
= wordtext
;
559 n
->narg
.backquote
= backquotelist
;
562 } else if (lasttoken
== TREDIR
) {
563 *rpp
= n
= redirnode
;
564 rpp
= &n
->nfile
.next
;
565 parsefname(); /* read name of redirection file */
566 } else if (lasttoken
== TLP
&& app
== &args
->narg
.next
567 && rpp
== orig_rpp
) {
568 /* We have a function */
569 if (readtoken() != TRP
)
573 if (! goodname(n
->narg
.text
))
574 synerror("Bad function name");
577 n
->narg
.next
= command();
587 n
= (union node
*)stalloc(sizeof (struct ncmd
));
591 n
->ncmd
.redirect
= redir
;
600 n
= (union node
*)stalloc(sizeof (struct narg
));
603 n
->narg
.text
= wordtext
;
604 n
->narg
.backquote
= backquotelist
;
609 fixredir(union node
*n
, const char *text
, int err
)
611 TRACE(("Fix redir %s %d\n", text
, err
));
613 n
->ndup
.vname
= NULL
;
615 if (is_digit(text
[0]) && text
[1] == '\0')
616 n
->ndup
.dupfd
= digit_val(text
[0]);
617 else if (text
[0] == '-' && text
[1] == '\0')
622 synerror("Bad fd number");
624 n
->ndup
.vname
= makename();
632 union node
*n
= redirnode
;
634 if (readtoken() != TWORD
)
636 if (n
->type
== NHERE
) {
637 struct heredoc
*here
= heredoc
;
643 TRACE(("Here document %d\n", n
->type
));
644 if (here
->striptabs
) {
645 while (*wordtext
== '\t')
648 if (! noexpand(wordtext
) || (i
= strlen(wordtext
)) == 0 || i
> EOFMARKLEN
)
649 synerror("Illegal eof marker for << redirection");
651 here
->eofmark
= wordtext
;
653 if (heredoclist
== NULL
)
656 for (p
= heredoclist
; p
->next
; p
= p
->next
);
659 } else if (n
->type
== NTOFD
|| n
->type
== NFROMFD
) {
660 fixredir(n
, wordtext
, 0);
662 n
->nfile
.fname
= makename();
668 * Input any here documents.
674 struct heredoc
*here
;
677 while (heredoclist
) {
679 heredoclist
= here
->next
;
684 readtoken1(pgetc(), here
->here
->type
== NHERE
? SQSYNTAX
: DQSYNTAX
,
685 here
->eofmark
, here
->striptabs
);
686 n
= (union node
*)stalloc(sizeof (struct narg
));
689 n
->narg
.text
= wordtext
;
690 n
->narg
.backquote
= backquotelist
;
691 here
->here
->nhere
.doc
= n
;
709 int savecheckkwd
= checkkwd
;
712 int alreadyseen
= tokpushback
;
731 * check for keywords and aliases
733 if (t
== TWORD
&& !quoteflag
)
735 const char * const *pp
;
737 for (pp
= parsekwd
; *pp
; pp
++) {
738 if (**pp
== *wordtext
&& equal(*pp
, wordtext
))
740 lasttoken
= t
= pp
- parsekwd
+ KWDOFFSET
;
741 TRACE(("keyword %s recognized\n", tokname
[t
]));
745 if (noaliases
== 0 &&
746 (ap
= lookupalias(wordtext
, 1)) != NULL
) {
747 pushstring(ap
->val
, strlen(ap
->val
), ap
);
748 checkkwd
= savecheckkwd
;
757 TRACE(("token %s %s\n", tokname
[t
], t
== TWORD
? wordtext
: ""));
759 TRACE(("reread token %s %s\n", tokname
[t
], t
== TWORD
? wordtext
: ""));
766 * Read the next input token.
767 * If the token is a word, we set backquotelist to the list of cmds in
768 * backquotes. We set quoteflag to true if any part of the word was
770 * If the token is TREDIR, then we set redirnode to a structure containing
772 * In all cases, the variable startlinno is set to the number of the line
773 * on which the token starts.
775 * [Change comment: here documents and internal procedures]
776 * [Readtoken shouldn't have any arguments. Perhaps we should make the
777 * word parsing code into a separate routine. In this case, readtoken
778 * doesn't need to have any internal procedures, but parseword does.
779 * We could also make parseoperator in essence the main routine, and
780 * have parseword (readtoken1?) handle both words and redirection.]
783 #define RETURN(token) return lasttoken = token
799 for (;;) { /* until token or start of word found */
801 if (c
== ' ' || c
== '\t')
802 continue; /* quick check for white space first */
807 while ((c
= pgetc()) != '\n' && c
!= PEOF
);
811 if (pgetc() == '\n') {
812 startlinno
= ++plinno
;
823 needprompt
= doprompt
;
849 /* else FALLTHROUGH */
855 return readtoken1(c
, BASESYNTAX
, NULL
, 0);
862 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
863 * is not NULL, read a here document. In the latter case, eofmark is the
864 * word which marks the end of the document and striptabs is true if
865 * leading tabs should be stripped from the document. The argument firstc
866 * is the first character of the input token or document.
868 * Because C does not have internal subroutines, I have simulated them
869 * using goto's to implement the subroutine linkage. The following macros
870 * will run code that appears at the end of readtoken1.
873 #define CHECKEND() {goto checkend; checkend_return:;}
874 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
875 #define PARSESUB() {goto parsesub; parsesub_return:;}
876 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
877 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
878 #define PARSEARITH() {goto parsearith; parsearith_return:;}
881 readtoken1(int firstc
, char const *syn
, char *eofmark
, int striptabs
)
884 char const * volatile syntax
= syn
;
887 char line
[EOFMARKLEN
+ 1];
888 struct nodelist
*bqlist
;
890 volatile int dblquote
;
891 volatile int varnest
; /* levels of variables expansion */
892 volatile int arinest
; /* levels of arithmetic expansion */
893 volatile int parenlevel
; /* levels of parens in arithmetic */
894 volatile int oldstyle
;
895 char const * volatile prevsyntax
= NULL
; /* syntax before arithmetic */
900 if (syntax
== DQSYNTAX
)
909 loop
: { /* for each line, until end of word */
910 CHECKEND(); /* set c to PEOF if at end of here document */
911 for (;;) { /* until end of line or end of word */
912 CHECKSTRSPACE(3, out
); /* permit 3 calls to USTPUTC */
914 synentry
= syntax
[c
];
918 if (syntax
== BASESYNTAX
)
919 goto endword
; /* exit outer loop */
927 goto loop
; /* continue outer loop */
932 if (eofmark
== NULL
|| dblquote
)
933 USTPUTC(CTLESC
, out
);
936 case CBACK
: /* backslash */
941 } else if (c
== '\n') {
948 if (dblquote
&& c
!= '\\' &&
949 c
!= '`' && c
!= '$' &&
950 (c
!= '"' || eofmark
!= NULL
))
952 if (SQSYNTAX
[c
] == CCTL
)
953 USTPUTC(CTLESC
, out
);
954 else if (eofmark
== NULL
)
955 USTPUTC(CTLQUOTEMARK
, out
);
962 USTPUTC(CTLQUOTEMARK
, out
);
967 USTPUTC(CTLQUOTEMARK
, out
);
972 if (eofmark
!= NULL
&& arinest
== 0 &&
979 } else if (eofmark
== NULL
) {
987 PARSESUB(); /* parse substitution */
989 case CENDVAR
: /* '}' */
992 USTPUTC(CTLENDVAR
, out
);
997 case CLP
: /* '(' in arithmetic */
1001 case CRP
: /* ')' in arithmetic */
1002 if (parenlevel
> 0) {
1006 if (pgetc() == ')') {
1007 if (--arinest
== 0) {
1008 USTPUTC(CTLENDARI
, out
);
1009 syntax
= prevsyntax
;
1010 if (syntax
== DQSYNTAX
)
1019 * (don't 2nd guess - no error)
1026 case CBQUOTE
: /* '`' */
1030 goto endword
; /* exit outer loop */
1033 goto endword
; /* exit outer loop */
1040 if (syntax
== ARISYNTAX
)
1041 synerror("Missing '))'");
1042 if (syntax
!= BASESYNTAX
&& ! parsebackquote
&& eofmark
== NULL
)
1043 synerror("Unterminated quoted string");
1045 startlinno
= plinno
;
1046 synerror("Missing '}'");
1049 len
= out
- stackblock();
1051 if (eofmark
== NULL
) {
1052 if ((c
== '>' || c
== '<')
1055 && (*out
== '\0' || is_digit(*out
))) {
1057 return lasttoken
= TREDIR
;
1063 backquotelist
= bqlist
;
1064 grabstackblock(len
);
1066 return lasttoken
= TWORD
;
1067 /* end of readtoken routine */
1072 * Check to see whether we are at the end of the here document. When this
1073 * is called, c is set to the first character of the next input line. If
1074 * we are at the end of the here document, this routine sets the c to PEOF.
1083 if (c
== *eofmark
) {
1084 if (pfgets(line
, sizeof line
) != NULL
) {
1088 for (q
= eofmark
+ 1 ; *q
&& *p
== *q
; p
++, q
++);
1089 if (*p
== '\n' && *q
== '\0') {
1092 needprompt
= doprompt
;
1094 pushstring(line
, strlen(line
), NULL
);
1099 goto checkend_return
;
1104 * Parse a redirection operator. The variable "out" points to a string
1105 * specifying the fd to be redirected. The variable "c" contains the
1106 * first character of the redirection operator.
1113 np
= (union node
*)stalloc(sizeof (struct nfile
));
1122 np
->type
= NCLOBBER
;
1127 } else { /* c == '<' */
1131 if (sizeof (struct nfile
) != sizeof (struct nhere
)) {
1132 np
= (union node
*)stalloc(sizeof (struct nhere
));
1136 heredoc
= (struct heredoc
*)stalloc(sizeof (struct heredoc
));
1138 if ((c
= pgetc()) == '-') {
1139 heredoc
->striptabs
= 1;
1141 heredoc
->striptabs
= 0;
1144 } else if (c
== '&')
1154 np
->nfile
.fd
= digit_val(fd
);
1156 goto parseredir_return
;
1161 * Parse a substitution. At this point, we have read the dollar sign
1171 static const char types
[] = "}-+?=";
1172 int bracketed_name
= 0; /* used to handle ${[0-9]*} variables */
1178 if (c
!= '(' && c
!= '{' && (is_eof(c
) || !is_name(c
)) &&
1182 } else if (c
== '(') { /* $(command) or $((arith)) */
1183 if (pgetc() == '(') {
1190 USTPUTC(CTLVAR
, out
);
1191 typeloc
= out
- stackblock();
1192 USTPUTC(VSNORMAL
, out
);
1199 if ((c
= pgetc()) == '}')
1207 if (!is_eof(c
) && is_name(c
)) {
1213 } while (!is_eof(c
) && is_in_name(c
));
1215 strncmp(out
- length
, "LINENO", length
) == 0) {
1216 /* Replace the variable name with the
1217 * current line number. */
1220 linno
-= funclinno
- 1;
1221 snprintf(buf
, sizeof(buf
), "%d", linno
);
1223 for (i
= 0; buf
[i
] != '\0'; i
++)
1224 STPUTC(buf
[i
], out
);
1227 } else if (is_digit(c
)) {
1228 if (bracketed_name
) {
1232 } while (is_digit(c
));
1238 if (! is_special(c
)) {
1256 p
= strchr(types
, c
);
1263 subtype
= p
- types
+ VSNORMAL
;
1269 subtype
= c
== '#' ? VSTRIMLEFT
:
1279 } else if (subtype
!= VSERROR
) {
1283 if (subtype
!= VSLENGTH
&& (dblquote
|| arinest
))
1285 *(stackblock() + typeloc
) = subtype
| flags
;
1286 if (subtype
!= VSNORMAL
)
1289 goto parsesub_return
;
1294 * Called to parse command substitutions. Newstyle is set if the command
1295 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
1296 * list of commands (passed by reference), and savelen is the number of
1297 * characters on the top of the stack which must be preserved.
1301 struct nodelist
**nlpp
;
1305 struct jmploc jmploc
;
1306 struct jmploc
*volatile savehandler
;
1308 volatile int saveprompt
;
1310 savepbq
= parsebackquote
;
1311 if (setjmp(jmploc
.loc
)) {
1315 handler
= savehandler
;
1316 longjmp(handler
->loc
, 1);
1320 savelen
= out
- stackblock();
1322 str
= ckmalloc(savelen
);
1323 memcpy(str
, stackblock(), savelen
);
1325 savehandler
= handler
;
1329 /* We must read until the closing backquote, giving special
1330 treatment to some slashes, and then push the string and
1331 reread it as input, interpreting it normally. */
1338 STARTSTACKSTR(pout
);
1344 switch (pc
= pgetc()) {
1349 if ((pc
= pgetc()) == '\n') {
1356 * If eating a newline, avoid putting
1357 * the newline into the new character
1358 * stream (via the STPUTC after the
1363 if (pc
!= '\\' && pc
!= '`' && pc
!= '$'
1364 && (!dblquote
|| pc
!= '"'))
1370 needprompt
= doprompt
;
1374 startlinno
= plinno
;
1375 synerror("EOF in backquote substitution");
1385 psavelen
= pout
- stackblock();
1387 pstr
= ckmalloc(psavelen
);
1388 memcpy(pstr
, stackblock(), psavelen
);
1389 setinputstring(pstr
, 1);
1394 nlpp
= &(*nlpp
)->next
;
1395 *nlpp
= (struct nodelist
*)stalloc(sizeof (struct nodelist
));
1396 (*nlpp
)->next
= NULL
;
1397 parsebackquote
= oldstyle
;
1400 saveprompt
= doprompt
;
1407 doprompt
= saveprompt
;
1409 if (readtoken() != TRP
)
1416 * Start reading from old file again, ignoring any pushed back
1417 * tokens left from the backquote parsing
1422 while (stackblocksize() <= savelen
)
1426 memcpy(out
, str
, savelen
);
1427 STADJUST(savelen
, out
);
1433 parsebackquote
= savepbq
;
1434 handler
= savehandler
;
1435 if (arinest
|| dblquote
)
1436 USTPUTC(CTLBACKQ
| CTLQUOTE
, out
);
1438 USTPUTC(CTLBACKQ
, out
);
1440 goto parsebackq_oldreturn
;
1442 goto parsebackq_newreturn
;
1446 * Parse an arithmetic expansion (indicate start of one and set state)
1450 if (++arinest
== 1) {
1451 prevsyntax
= syntax
;
1453 USTPUTC(CTLARI
, out
);
1460 * we collapse embedded arithmetic expansion to
1461 * parenthesis, which should be equivalent
1465 goto parsearith_return
;
1468 } /* end of readtoken */
1480 * Returns true if the text contains nothing to expand (no dollar signs
1485 noexpand(char *text
)
1491 while ((c
= *p
++) != '\0') {
1492 if ( c
== CTLQUOTEMARK
)
1496 else if (BASESYNTAX
[(int)c
] == CCTL
)
1504 * Return true if the argument is a legal variable name (a letter or
1505 * underscore followed by zero or more letters, underscores, and digits).
1509 goodname(char *name
)
1517 if (! is_in_name(*p
))
1525 * Called when an unexpected token is read during the parse. The argument
1526 * is the token that is expected, or -1 if more than one type of token can
1527 * occur at this point.
1531 synexpect(int token
)
1536 fmtstr(msg
, 64, "%s unexpected (expecting %s)",
1537 tokname
[lasttoken
], tokname
[token
]);
1539 fmtstr(msg
, 64, "%s unexpected", tokname
[lasttoken
]);
1546 synerror(const char *msg
)
1549 outfmt(&errout
, "%s: %d: ", commandname
, startlinno
);
1550 outfmt(&errout
, "Syntax error: %s\n", msg
);
1555 setprompt(int which
)
1557 whichprompt
= which
;
1562 out2str(getprompt(NULL
));
1566 * called by editline -- any expansions to the prompt
1567 * should be added here.
1570 getprompt(void *unused __unused
)
1572 static char ps
[PROMPTLEN
];
1577 * Select prompt format.
1579 switch (whichprompt
) {
1590 return "<internal prompt error>";
1594 * Format prompt string.
1596 for (i
= 0; (i
< 127) && (*fmt
!= '\0'); i
++, fmt
++)
1603 * \h specifies just the local hostname,
1604 * \H specifies fully-qualified hostname.
1609 gethostname(&ps
[i
], PROMPTLEN
- i
);
1610 /* Skip to end of hostname. */
1611 trim
= (*fmt
== 'h') ? '.' : '\0';
1612 while ((ps
[i
+1] != '\0') && (ps
[i
+1] != trim
))
1617 * Working directory.
1619 * \W specifies just the final component,
1620 * \w specifies the entire path.
1625 getcwd(&ps
[i
], PROMPTLEN
- i
);
1627 /* Final path component only. */
1629 for (j
= i
; ps
[j
] != '\0'; j
++)
1632 memmove(&ps
[i
], &ps
[trim
],
1635 /* Skip to end of path. */
1636 while (ps
[i
+ 1] != '\0')
1643 * '$' for normal users, '#' for root.
1646 ps
[i
] = (geteuid() != 0) ? '$' : '#';
1657 * Emit unrecognized formats verbatim.