parser.c revision 66612
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 351556Srgrimes */ 361556Srgrimes 371556Srgrimes#ifndef lint 3836150Scharnier#if 0 3936150Scharnierstatic char sccsid[] = "@(#)parser.c 8.7 (Berkeley) 5/16/95"; 4036150Scharnier#endif 4136150Scharnierstatic const char rcsid[] = 4250471Speter "$FreeBSD: head/bin/sh/parser.c 66612 2000-10-03 23:13:14Z brian $"; 431556Srgrimes#endif /* not lint */ 441556Srgrimes 4517987Speter#include <stdlib.h> 4617987Speter 471556Srgrimes#include "shell.h" 481556Srgrimes#include "parser.h" 491556Srgrimes#include "nodes.h" 501556Srgrimes#include "expand.h" /* defines rmescapes() */ 511556Srgrimes#include "redir.h" /* defines copyfd() */ 521556Srgrimes#include "syntax.h" 531556Srgrimes#include "options.h" 541556Srgrimes#include "input.h" 551556Srgrimes#include "output.h" 561556Srgrimes#include "var.h" 571556Srgrimes#include "error.h" 581556Srgrimes#include "memalloc.h" 591556Srgrimes#include "mystring.h" 601556Srgrimes#include "alias.h" 6117987Speter#include "show.h" 6259436Scracauer#include "eval.h" 6317987Speter#ifndef NO_HISTORY 641556Srgrimes#include "myhistedit.h" 6517987Speter#endif 661556Srgrimes 671556Srgrimes/* 681556Srgrimes * Shell command parser. 691556Srgrimes */ 701556Srgrimes 711556Srgrimes#define EOFMARKLEN 79 721556Srgrimes 731556Srgrimes/* values returned by readtoken */ 7417987Speter#include "token.h" 751556Srgrimes 761556Srgrimes 771556Srgrimes 781556Srgrimesstruct heredoc { 791556Srgrimes struct heredoc *next; /* next here document in list */ 801556Srgrimes union node *here; /* redirection node */ 811556Srgrimes char *eofmark; /* string indicating end of input */ 821556Srgrimes int striptabs; /* if set, strip leading tabs */ 831556Srgrimes}; 841556Srgrimes 851556Srgrimes 861556Srgrimes 871556Srgrimesstruct heredoc *heredoclist; /* list of here documents to read */ 881556Srgrimesint parsebackquote; /* nonzero if we are inside backquotes */ 891556Srgrimesint doprompt; /* if set, prompt the user */ 901556Srgrimesint needprompt; /* true if interactive and at start of line */ 911556Srgrimesint lasttoken; /* last token read */ 921556SrgrimesMKINIT int tokpushback; /* last token pushed back */ 931556Srgrimeschar *wordtext; /* text of last word returned by readtoken */ 941556SrgrimesMKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ 951556Srgrimesstruct nodelist *backquotelist; 961556Srgrimesunion node *redirnode; 971556Srgrimesstruct heredoc *heredoc; 981556Srgrimesint quoteflag; /* set if (part of) last token was quoted */ 991556Srgrimesint startlinno; /* line # where last token started */ 1001556Srgrimes 10118018Speter/* XXX When 'noaliases' is set to one, no alias expansion takes place. */ 10218018Speterstatic int noaliases = 0; 1031556Srgrimes 1041556Srgrimes#define GDB_HACK 1 /* avoid local declarations which gdb can't handle */ 1051556Srgrimes#ifdef GDB_HACK 1061556Srgrimesstatic const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'}; 1071556Srgrimesstatic const char types[] = "}-+?="; 1081556Srgrimes#endif 1091556Srgrimes 1101556Srgrimes 1111556SrgrimesSTATIC union node *list __P((int)); 1121556SrgrimesSTATIC union node *andor __P((void)); 1131556SrgrimesSTATIC union node *pipeline __P((void)); 1141556SrgrimesSTATIC union node *command __P((void)); 1151556SrgrimesSTATIC union node *simplecmd __P((union node **, union node *)); 11617987SpeterSTATIC union node *makename __P((void)); 1171556SrgrimesSTATIC void parsefname __P((void)); 1181556SrgrimesSTATIC void parseheredoc __P((void)); 11917987SpeterSTATIC int peektoken __P((void)); 1201556SrgrimesSTATIC int readtoken __P((void)); 12117987SpeterSTATIC int xxreadtoken __P((void)); 1221556SrgrimesSTATIC int readtoken1 __P((int, char const *, char *, int)); 1231556SrgrimesSTATIC int noexpand __P((char *)); 1241556SrgrimesSTATIC void synexpect __P((int)); 1251556SrgrimesSTATIC void synerror __P((char *)); 12620425SsteveSTATIC void setprompt __P((int)); 1271556Srgrimes 12817987Speter 1291556Srgrimes/* 1301556Srgrimes * Read and parse a command. Returns NEOF on end of file. (NULL is a 1311556Srgrimes * valid parse tree indicating a blank line.) 1321556Srgrimes */ 1331556Srgrimes 1341556Srgrimesunion node * 13520425Ssteveparsecmd(interact) 13617987Speter int interact; 13717987Speter{ 1381556Srgrimes int t; 1391556Srgrimes 14060593Scracauer tokpushback = 0; 1411556Srgrimes doprompt = interact; 1421556Srgrimes if (doprompt) 1431556Srgrimes setprompt(1); 1441556Srgrimes else 1451556Srgrimes setprompt(0); 1461556Srgrimes needprompt = 0; 1471556Srgrimes t = readtoken(); 1481556Srgrimes if (t == TEOF) 1491556Srgrimes return NEOF; 1501556Srgrimes if (t == TNL) 1511556Srgrimes return NULL; 1521556Srgrimes tokpushback++; 1531556Srgrimes return list(1); 1541556Srgrimes} 1551556Srgrimes 1561556Srgrimes 1571556SrgrimesSTATIC union node * 15820425Sstevelist(nlflag) 15917987Speter int nlflag; 16017987Speter{ 1611556Srgrimes union node *n1, *n2, *n3; 16217987Speter int tok; 1631556Srgrimes 1641556Srgrimes checkkwd = 2; 1651556Srgrimes if (nlflag == 0 && tokendlist[peektoken()]) 1661556Srgrimes return NULL; 16717987Speter n1 = NULL; 1681556Srgrimes for (;;) { 16917987Speter n2 = andor(); 17017987Speter tok = readtoken(); 17117987Speter if (tok == TBACKGND) { 17217987Speter if (n2->type == NCMD || n2->type == NPIPE) { 17317987Speter n2->ncmd.backgnd = 1; 17417987Speter } else if (n2->type == NREDIR) { 17517987Speter n2->type = NBACKGND; 17617987Speter } else { 17717987Speter n3 = (union node *)stalloc(sizeof (struct nredir)); 17817987Speter n3->type = NBACKGND; 17917987Speter n3->nredir.n = n2; 18017987Speter n3->nredir.redirect = NULL; 18117987Speter n2 = n3; 18217987Speter } 18317987Speter } 18417987Speter if (n1 == NULL) { 18517987Speter n1 = n2; 18617987Speter } 18717987Speter else { 18817987Speter n3 = (union node *)stalloc(sizeof (struct nbinary)); 18917987Speter n3->type = NSEMI; 19017987Speter n3->nbinary.ch1 = n1; 19117987Speter n3->nbinary.ch2 = n2; 19217987Speter n1 = n3; 19317987Speter } 19417987Speter switch (tok) { 19513882Sjoerg case TBACKGND: 19617987Speter case TSEMI: 19717987Speter tok = readtoken(); 19817987Speter /* fall through */ 1991556Srgrimes case TNL: 20017987Speter if (tok == TNL) { 20117987Speter parseheredoc(); 20217987Speter if (nlflag) 20317987Speter return n1; 20417987Speter } else { 20517987Speter tokpushback++; 20617987Speter } 2071556Srgrimes checkkwd = 2; 2081556Srgrimes if (tokendlist[peektoken()]) 2091556Srgrimes return n1; 2101556Srgrimes break; 2111556Srgrimes case TEOF: 2121556Srgrimes if (heredoclist) 2131556Srgrimes parseheredoc(); 2141556Srgrimes else 2151556Srgrimes pungetc(); /* push back EOF on input */ 2161556Srgrimes return n1; 2171556Srgrimes default: 2181556Srgrimes if (nlflag) 2191556Srgrimes synexpect(-1); 2201556Srgrimes tokpushback++; 2211556Srgrimes return n1; 2221556Srgrimes } 2231556Srgrimes } 2241556Srgrimes} 2251556Srgrimes 2261556Srgrimes 2271556Srgrimes 2281556SrgrimesSTATIC union node * 2291556Srgrimesandor() { 2301556Srgrimes union node *n1, *n2, *n3; 2311556Srgrimes int t; 2321556Srgrimes 2331556Srgrimes n1 = pipeline(); 2341556Srgrimes for (;;) { 2351556Srgrimes if ((t = readtoken()) == TAND) { 2361556Srgrimes t = NAND; 2371556Srgrimes } else if (t == TOR) { 2381556Srgrimes t = NOR; 2391556Srgrimes } else { 2401556Srgrimes tokpushback++; 2411556Srgrimes return n1; 2421556Srgrimes } 2431556Srgrimes n2 = pipeline(); 2441556Srgrimes n3 = (union node *)stalloc(sizeof (struct nbinary)); 2451556Srgrimes n3->type = t; 2461556Srgrimes n3->nbinary.ch1 = n1; 2471556Srgrimes n3->nbinary.ch2 = n2; 2481556Srgrimes n1 = n3; 2491556Srgrimes } 2501556Srgrimes} 2511556Srgrimes 2521556Srgrimes 2531556Srgrimes 2541556SrgrimesSTATIC union node * 2551556Srgrimespipeline() { 25625230Ssteve union node *n1, *pipenode, *notnode; 2571556Srgrimes struct nodelist *lp, *prev; 25825230Ssteve int negate = 0; 2591556Srgrimes 2601556Srgrimes TRACE(("pipeline: entered\n")); 26125230Ssteve while (readtoken() == TNOT) { 26225230Ssteve TRACE(("pipeline: TNOT recognized\n")); 26325230Ssteve negate = !negate; 26425230Ssteve } 26525230Ssteve tokpushback++; 2661556Srgrimes n1 = command(); 2671556Srgrimes if (readtoken() == TPIPE) { 2681556Srgrimes pipenode = (union node *)stalloc(sizeof (struct npipe)); 2691556Srgrimes pipenode->type = NPIPE; 2701556Srgrimes pipenode->npipe.backgnd = 0; 2711556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 2721556Srgrimes pipenode->npipe.cmdlist = lp; 2731556Srgrimes lp->n = n1; 2741556Srgrimes do { 2751556Srgrimes prev = lp; 2761556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 2771556Srgrimes lp->n = command(); 2781556Srgrimes prev->next = lp; 2791556Srgrimes } while (readtoken() == TPIPE); 2801556Srgrimes lp->next = NULL; 2811556Srgrimes n1 = pipenode; 2821556Srgrimes } 2831556Srgrimes tokpushback++; 28425230Ssteve if (negate) { 28525230Ssteve notnode = (union node *)stalloc(sizeof(struct nnot)); 28625230Ssteve notnode->type = NNOT; 28725230Ssteve notnode->nnot.com = n1; 28825230Ssteve n1 = notnode; 28925230Ssteve } 2901556Srgrimes return n1; 2911556Srgrimes} 2921556Srgrimes 2931556Srgrimes 2941556Srgrimes 2951556SrgrimesSTATIC union node * 2961556Srgrimescommand() { 2971556Srgrimes union node *n1, *n2; 2981556Srgrimes union node *ap, **app; 2991556Srgrimes union node *cp, **cpp; 3001556Srgrimes union node *redir, **rpp; 30125230Ssteve int t; 3021556Srgrimes 3031556Srgrimes checkkwd = 2; 30417987Speter redir = NULL; 30517987Speter n1 = NULL; 3061556Srgrimes rpp = &redir; 30720425Ssteve 3081556Srgrimes /* Check for redirection which may precede command */ 3091556Srgrimes while (readtoken() == TREDIR) { 3101556Srgrimes *rpp = n2 = redirnode; 3111556Srgrimes rpp = &n2->nfile.next; 3121556Srgrimes parsefname(); 3131556Srgrimes } 3141556Srgrimes tokpushback++; 3151556Srgrimes 3161556Srgrimes switch (readtoken()) { 3171556Srgrimes case TIF: 3181556Srgrimes n1 = (union node *)stalloc(sizeof (struct nif)); 3191556Srgrimes n1->type = NIF; 3201556Srgrimes n1->nif.test = list(0); 3211556Srgrimes if (readtoken() != TTHEN) 3221556Srgrimes synexpect(TTHEN); 3231556Srgrimes n1->nif.ifpart = list(0); 3241556Srgrimes n2 = n1; 3251556Srgrimes while (readtoken() == TELIF) { 3261556Srgrimes n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 3271556Srgrimes n2 = n2->nif.elsepart; 3281556Srgrimes n2->type = NIF; 3291556Srgrimes n2->nif.test = list(0); 3301556Srgrimes if (readtoken() != TTHEN) 3311556Srgrimes synexpect(TTHEN); 3321556Srgrimes n2->nif.ifpart = list(0); 3331556Srgrimes } 3341556Srgrimes if (lasttoken == TELSE) 3351556Srgrimes n2->nif.elsepart = list(0); 3361556Srgrimes else { 3371556Srgrimes n2->nif.elsepart = NULL; 3381556Srgrimes tokpushback++; 3391556Srgrimes } 3401556Srgrimes if (readtoken() != TFI) 3411556Srgrimes synexpect(TFI); 3421556Srgrimes checkkwd = 1; 3431556Srgrimes break; 3441556Srgrimes case TWHILE: 3451556Srgrimes case TUNTIL: { 3461556Srgrimes int got; 3471556Srgrimes n1 = (union node *)stalloc(sizeof (struct nbinary)); 3481556Srgrimes n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 3491556Srgrimes n1->nbinary.ch1 = list(0); 3501556Srgrimes if ((got=readtoken()) != TDO) { 3511556SrgrimesTRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 3521556Srgrimes synexpect(TDO); 3531556Srgrimes } 3541556Srgrimes n1->nbinary.ch2 = list(0); 3551556Srgrimes if (readtoken() != TDONE) 3561556Srgrimes synexpect(TDONE); 3571556Srgrimes checkkwd = 1; 3581556Srgrimes break; 3591556Srgrimes } 3601556Srgrimes case TFOR: 3611556Srgrimes if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 3621556Srgrimes synerror("Bad for loop variable"); 3631556Srgrimes n1 = (union node *)stalloc(sizeof (struct nfor)); 3641556Srgrimes n1->type = NFOR; 3651556Srgrimes n1->nfor.var = wordtext; 3661556Srgrimes if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) { 3671556Srgrimes app = ≈ 3681556Srgrimes while (readtoken() == TWORD) { 3691556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 3701556Srgrimes n2->type = NARG; 3711556Srgrimes n2->narg.text = wordtext; 3721556Srgrimes n2->narg.backquote = backquotelist; 3731556Srgrimes *app = n2; 3741556Srgrimes app = &n2->narg.next; 3751556Srgrimes } 3761556Srgrimes *app = NULL; 3771556Srgrimes n1->nfor.args = ap; 3781556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 3791556Srgrimes synexpect(-1); 3801556Srgrimes } else { 3811556Srgrimes#ifndef GDB_HACK 3821556Srgrimes static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, 3831556Srgrimes '@', '=', '\0'}; 3841556Srgrimes#endif 3851556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 3861556Srgrimes n2->type = NARG; 3871556Srgrimes n2->narg.text = (char *)argvars; 3881556Srgrimes n2->narg.backquote = NULL; 3891556Srgrimes n2->narg.next = NULL; 3901556Srgrimes n1->nfor.args = n2; 3911556Srgrimes /* 3921556Srgrimes * Newline or semicolon here is optional (but note 3931556Srgrimes * that the original Bourne shell only allowed NL). 3941556Srgrimes */ 3951556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 3961556Srgrimes tokpushback++; 3971556Srgrimes } 3981556Srgrimes checkkwd = 2; 3991556Srgrimes if ((t = readtoken()) == TDO) 4001556Srgrimes t = TDONE; 4011556Srgrimes else if (t == TBEGIN) 4021556Srgrimes t = TEND; 4031556Srgrimes else 4041556Srgrimes synexpect(-1); 4051556Srgrimes n1->nfor.body = list(0); 4061556Srgrimes if (readtoken() != t) 4071556Srgrimes synexpect(t); 4081556Srgrimes checkkwd = 1; 4091556Srgrimes break; 4101556Srgrimes case TCASE: 4111556Srgrimes n1 = (union node *)stalloc(sizeof (struct ncase)); 4121556Srgrimes n1->type = NCASE; 4131556Srgrimes if (readtoken() != TWORD) 4141556Srgrimes synexpect(TWORD); 4151556Srgrimes n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 4161556Srgrimes n2->type = NARG; 4171556Srgrimes n2->narg.text = wordtext; 4181556Srgrimes n2->narg.backquote = backquotelist; 4191556Srgrimes n2->narg.next = NULL; 4201556Srgrimes while (readtoken() == TNL); 4211556Srgrimes if (lasttoken != TWORD || ! equal(wordtext, "in")) 4221556Srgrimes synerror("expecting \"in\""); 4231556Srgrimes cpp = &n1->ncase.cases; 42418018Speter noaliases = 1; /* turn off alias expansion */ 4252760Ssef checkkwd = 2, readtoken(); 4262760Ssef do { 4271556Srgrimes *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 4281556Srgrimes cp->type = NCLIST; 4291556Srgrimes app = &cp->nclist.pattern; 4301556Srgrimes for (;;) { 4311556Srgrimes *app = ap = (union node *)stalloc(sizeof (struct narg)); 4321556Srgrimes ap->type = NARG; 4331556Srgrimes ap->narg.text = wordtext; 4341556Srgrimes ap->narg.backquote = backquotelist; 4352760Ssef if (checkkwd = 2, readtoken() != TPIPE) 4361556Srgrimes break; 4371556Srgrimes app = &ap->narg.next; 4382760Ssef readtoken(); 4391556Srgrimes } 4401556Srgrimes ap->narg.next = NULL; 4411556Srgrimes if (lasttoken != TRP) 44218018Speter noaliases = 0, synexpect(TRP); 4431556Srgrimes cp->nclist.body = list(0); 4442760Ssef 4452760Ssef checkkwd = 2; 4462760Ssef if ((t = readtoken()) != TESAC) { 4472760Ssef if (t != TENDCASE) 44818018Speter noaliases = 0, synexpect(TENDCASE); 4492760Ssef else 4502760Ssef checkkwd = 2, readtoken(); 4512760Ssef } 4521556Srgrimes cpp = &cp->nclist.next; 4532760Ssef } while(lasttoken != TESAC); 45418018Speter noaliases = 0; /* reset alias expansion */ 4551556Srgrimes *cpp = NULL; 4561556Srgrimes checkkwd = 1; 4571556Srgrimes break; 4581556Srgrimes case TLP: 4591556Srgrimes n1 = (union node *)stalloc(sizeof (struct nredir)); 4601556Srgrimes n1->type = NSUBSHELL; 4611556Srgrimes n1->nredir.n = list(0); 4621556Srgrimes n1->nredir.redirect = NULL; 4631556Srgrimes if (readtoken() != TRP) 4641556Srgrimes synexpect(TRP); 4651556Srgrimes checkkwd = 1; 4661556Srgrimes break; 4671556Srgrimes case TBEGIN: 4681556Srgrimes n1 = list(0); 4691556Srgrimes if (readtoken() != TEND) 4701556Srgrimes synexpect(TEND); 4711556Srgrimes checkkwd = 1; 4721556Srgrimes break; 4731556Srgrimes /* Handle an empty command like other simple commands. */ 47417987Speter case TSEMI: 47517987Speter /* 47617987Speter * An empty command before a ; doesn't make much sense, and 47717987Speter * should certainly be disallowed in the case of `if ;'. 47817987Speter */ 47917987Speter if (!redir) 48017987Speter synexpect(-1); 48120425Ssteve case TAND: 48220425Ssteve case TOR: 4831556Srgrimes case TNL: 48410399Sjoerg case TEOF: 4851556Srgrimes case TWORD: 48617987Speter case TRP: 4871556Srgrimes tokpushback++; 48825230Ssteve return simplecmd(rpp, redir); 4891556Srgrimes default: 4901556Srgrimes synexpect(-1); 4911556Srgrimes } 4921556Srgrimes 4931556Srgrimes /* Now check for redirection which may follow command */ 4941556Srgrimes while (readtoken() == TREDIR) { 4951556Srgrimes *rpp = n2 = redirnode; 4961556Srgrimes rpp = &n2->nfile.next; 4971556Srgrimes parsefname(); 4981556Srgrimes } 4991556Srgrimes tokpushback++; 5001556Srgrimes *rpp = NULL; 5011556Srgrimes if (redir) { 5021556Srgrimes if (n1->type != NSUBSHELL) { 5031556Srgrimes n2 = (union node *)stalloc(sizeof (struct nredir)); 5041556Srgrimes n2->type = NREDIR; 5051556Srgrimes n2->nredir.n = n1; 5061556Srgrimes n1 = n2; 5071556Srgrimes } 5081556Srgrimes n1->nredir.redirect = redir; 5091556Srgrimes } 51025230Ssteve return n1; 5111556Srgrimes} 5121556Srgrimes 5131556Srgrimes 5141556SrgrimesSTATIC union node * 5158855Srgrimessimplecmd(rpp, redir) 5161556Srgrimes union node **rpp, *redir; 5171556Srgrimes { 5181556Srgrimes union node *args, **app; 5191556Srgrimes union node **orig_rpp = rpp; 52025230Ssteve union node *n = NULL; 5211556Srgrimes 5221556Srgrimes /* If we don't have any redirections already, then we must reset */ 5231556Srgrimes /* rpp to be the address of the local redir variable. */ 5241556Srgrimes if (redir == 0) 5251556Srgrimes rpp = &redir; 5261556Srgrimes 5271556Srgrimes args = NULL; 5281556Srgrimes app = &args; 5298855Srgrimes /* 5301556Srgrimes * We save the incoming value, because we need this for shell 5311556Srgrimes * functions. There can not be a redirect or an argument between 5328855Srgrimes * the function name and the open parenthesis. 5331556Srgrimes */ 5341556Srgrimes orig_rpp = rpp; 5351556Srgrimes 5361556Srgrimes for (;;) { 5371556Srgrimes if (readtoken() == TWORD) { 5381556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 5391556Srgrimes n->type = NARG; 5401556Srgrimes n->narg.text = wordtext; 5411556Srgrimes n->narg.backquote = backquotelist; 5421556Srgrimes *app = n; 5431556Srgrimes app = &n->narg.next; 5441556Srgrimes } else if (lasttoken == TREDIR) { 5451556Srgrimes *rpp = n = redirnode; 5461556Srgrimes rpp = &n->nfile.next; 5471556Srgrimes parsefname(); /* read name of redirection file */ 5481556Srgrimes } else if (lasttoken == TLP && app == &args->narg.next 5491556Srgrimes && rpp == orig_rpp) { 5501556Srgrimes /* We have a function */ 5511556Srgrimes if (readtoken() != TRP) 5521556Srgrimes synexpect(TRP); 5531556Srgrimes#ifdef notdef 5541556Srgrimes if (! goodname(n->narg.text)) 5551556Srgrimes synerror("Bad function name"); 5561556Srgrimes#endif 5571556Srgrimes n->type = NDEFUN; 5581556Srgrimes n->narg.next = command(); 55925230Ssteve return n; 5601556Srgrimes } else { 5611556Srgrimes tokpushback++; 5621556Srgrimes break; 5631556Srgrimes } 5641556Srgrimes } 5651556Srgrimes *app = NULL; 5661556Srgrimes *rpp = NULL; 5671556Srgrimes n = (union node *)stalloc(sizeof (struct ncmd)); 5681556Srgrimes n->type = NCMD; 5691556Srgrimes n->ncmd.backgnd = 0; 5701556Srgrimes n->ncmd.args = args; 5711556Srgrimes n->ncmd.redirect = redir; 57225230Ssteve return n; 5731556Srgrimes} 5741556Srgrimes 57517987SpeterSTATIC union node * 57617987Spetermakename() { 57717987Speter union node *n; 5781556Srgrimes 57917987Speter n = (union node *)stalloc(sizeof (struct narg)); 58017987Speter n->type = NARG; 58117987Speter n->narg.next = NULL; 58217987Speter n->narg.text = wordtext; 58317987Speter n->narg.backquote = backquotelist; 58417987Speter return n; 58517987Speter} 58617987Speter 58717987Spetervoid fixredir(n, text, err) 58817987Speter union node *n; 58917987Speter const char *text; 59017987Speter int err; 59117987Speter { 59217987Speter TRACE(("Fix redir %s %d\n", text, err)); 59317987Speter if (!err) 59417987Speter n->ndup.vname = NULL; 59517987Speter 59617987Speter if (is_digit(text[0]) && text[1] == '\0') 59717987Speter n->ndup.dupfd = digit_val(text[0]); 59817987Speter else if (text[0] == '-' && text[1] == '\0') 59917987Speter n->ndup.dupfd = -1; 60017987Speter else { 60120425Ssteve 60217987Speter if (err) 60317987Speter synerror("Bad fd number"); 60417987Speter else 60517987Speter n->ndup.vname = makename(); 60617987Speter } 60717987Speter} 60817987Speter 60917987Speter 6101556SrgrimesSTATIC void 6111556Srgrimesparsefname() { 6121556Srgrimes union node *n = redirnode; 6131556Srgrimes 6141556Srgrimes if (readtoken() != TWORD) 6151556Srgrimes synexpect(-1); 6161556Srgrimes if (n->type == NHERE) { 6171556Srgrimes struct heredoc *here = heredoc; 6181556Srgrimes struct heredoc *p; 6191556Srgrimes int i; 6201556Srgrimes 6211556Srgrimes if (quoteflag == 0) 6221556Srgrimes n->type = NXHERE; 6231556Srgrimes TRACE(("Here document %d\n", n->type)); 6241556Srgrimes if (here->striptabs) { 6251556Srgrimes while (*wordtext == '\t') 6261556Srgrimes wordtext++; 6271556Srgrimes } 6281556Srgrimes if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 6291556Srgrimes synerror("Illegal eof marker for << redirection"); 6301556Srgrimes rmescapes(wordtext); 6311556Srgrimes here->eofmark = wordtext; 6321556Srgrimes here->next = NULL; 6331556Srgrimes if (heredoclist == NULL) 6341556Srgrimes heredoclist = here; 6351556Srgrimes else { 6361556Srgrimes for (p = heredoclist ; p->next ; p = p->next); 6371556Srgrimes p->next = here; 6381556Srgrimes } 6391556Srgrimes } else if (n->type == NTOFD || n->type == NFROMFD) { 64017987Speter fixredir(n, wordtext, 0); 6411556Srgrimes } else { 64217987Speter n->nfile.fname = makename(); 6431556Srgrimes } 6441556Srgrimes} 6451556Srgrimes 6461556Srgrimes 6471556Srgrimes/* 6481556Srgrimes * Input any here documents. 6491556Srgrimes */ 6501556Srgrimes 6511556SrgrimesSTATIC void 6521556Srgrimesparseheredoc() { 6531556Srgrimes struct heredoc *here; 6541556Srgrimes union node *n; 6551556Srgrimes 6561556Srgrimes while (heredoclist) { 6571556Srgrimes here = heredoclist; 6581556Srgrimes heredoclist = here->next; 6591556Srgrimes if (needprompt) { 6601556Srgrimes setprompt(2); 6611556Srgrimes needprompt = 0; 6621556Srgrimes } 6631556Srgrimes readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 6641556Srgrimes here->eofmark, here->striptabs); 6651556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 6661556Srgrimes n->narg.type = NARG; 6671556Srgrimes n->narg.next = NULL; 6681556Srgrimes n->narg.text = wordtext; 6691556Srgrimes n->narg.backquote = backquotelist; 6701556Srgrimes here->here->nhere.doc = n; 6711556Srgrimes } 6721556Srgrimes} 6731556Srgrimes 6741556SrgrimesSTATIC int 6751556Srgrimespeektoken() { 6761556Srgrimes int t; 6771556Srgrimes 6781556Srgrimes t = readtoken(); 6791556Srgrimes tokpushback++; 6801556Srgrimes return (t); 6811556Srgrimes} 6821556Srgrimes 6831556SrgrimesSTATIC int 6841556Srgrimesreadtoken() { 6851556Srgrimes int t; 6861556Srgrimes int savecheckkwd = checkkwd; 6871556Srgrimes struct alias *ap; 6881556Srgrimes#ifdef DEBUG 6891556Srgrimes int alreadyseen = tokpushback; 6901556Srgrimes#endif 6918855Srgrimes 6921556Srgrimes top: 6931556Srgrimes t = xxreadtoken(); 6941556Srgrimes 6951556Srgrimes if (checkkwd) { 6961556Srgrimes /* 6971556Srgrimes * eat newlines 6981556Srgrimes */ 6991556Srgrimes if (checkkwd == 2) { 7001556Srgrimes checkkwd = 0; 7011556Srgrimes while (t == TNL) { 7021556Srgrimes parseheredoc(); 7031556Srgrimes t = xxreadtoken(); 7041556Srgrimes } 7051556Srgrimes } else 7061556Srgrimes checkkwd = 0; 7071556Srgrimes /* 7081556Srgrimes * check for keywords and aliases 7091556Srgrimes */ 71020425Ssteve if (t == TWORD && !quoteflag) 71117987Speter { 71225230Ssteve char * const *pp; 7131556Srgrimes 7141556Srgrimes for (pp = (char **)parsekwd; *pp; pp++) { 71520425Ssteve if (**pp == *wordtext && equal(*pp, wordtext)) 71617987Speter { 7171556Srgrimes lasttoken = t = pp - parsekwd + KWDOFFSET; 7181556Srgrimes TRACE(("keyword %s recognized\n", tokname[t])); 7191556Srgrimes goto out; 7201556Srgrimes } 7211556Srgrimes } 72218018Speter if (noaliases == 0 && 72318018Speter (ap = lookupalias(wordtext, 1)) != NULL) { 7241556Srgrimes pushstring(ap->val, strlen(ap->val), ap); 7251556Srgrimes checkkwd = savecheckkwd; 7261556Srgrimes goto top; 7271556Srgrimes } 7281556Srgrimes } 7291556Srgrimesout: 73025230Ssteve checkkwd = 0; 7311556Srgrimes } 7321556Srgrimes#ifdef DEBUG 7331556Srgrimes if (!alreadyseen) 7341556Srgrimes TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 7351556Srgrimes else 7361556Srgrimes TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 7371556Srgrimes#endif 7381556Srgrimes return (t); 7391556Srgrimes} 7401556Srgrimes 7411556Srgrimes 7421556Srgrimes/* 7431556Srgrimes * Read the next input token. 7441556Srgrimes * If the token is a word, we set backquotelist to the list of cmds in 7451556Srgrimes * backquotes. We set quoteflag to true if any part of the word was 7461556Srgrimes * quoted. 7471556Srgrimes * If the token is TREDIR, then we set redirnode to a structure containing 7481556Srgrimes * the redirection. 7491556Srgrimes * In all cases, the variable startlinno is set to the number of the line 7501556Srgrimes * on which the token starts. 7511556Srgrimes * 7521556Srgrimes * [Change comment: here documents and internal procedures] 7531556Srgrimes * [Readtoken shouldn't have any arguments. Perhaps we should make the 7541556Srgrimes * word parsing code into a separate routine. In this case, readtoken 7551556Srgrimes * doesn't need to have any internal procedures, but parseword does. 7561556Srgrimes * We could also make parseoperator in essence the main routine, and 7571556Srgrimes * have parseword (readtoken1?) handle both words and redirection.] 7581556Srgrimes */ 7591556Srgrimes 7601556Srgrimes#define RETURN(token) return lasttoken = token 7611556Srgrimes 7621556SrgrimesSTATIC int 7631556Srgrimesxxreadtoken() { 76425230Ssteve int c; 7651556Srgrimes 7661556Srgrimes if (tokpushback) { 7671556Srgrimes tokpushback = 0; 7681556Srgrimes return lasttoken; 7691556Srgrimes } 7701556Srgrimes if (needprompt) { 7711556Srgrimes setprompt(2); 7721556Srgrimes needprompt = 0; 7731556Srgrimes } 7741556Srgrimes startlinno = plinno; 7751556Srgrimes for (;;) { /* until token or start of word found */ 7761556Srgrimes c = pgetc_macro(); 7771556Srgrimes if (c == ' ' || c == '\t') 7781556Srgrimes continue; /* quick check for white space first */ 7791556Srgrimes switch (c) { 7801556Srgrimes case ' ': case '\t': 7811556Srgrimes continue; 7821556Srgrimes case '#': 7831556Srgrimes while ((c = pgetc()) != '\n' && c != PEOF); 7841556Srgrimes pungetc(); 7851556Srgrimes continue; 7861556Srgrimes case '\\': 7871556Srgrimes if (pgetc() == '\n') { 7881556Srgrimes startlinno = ++plinno; 7891556Srgrimes if (doprompt) 7901556Srgrimes setprompt(2); 7911556Srgrimes else 7921556Srgrimes setprompt(0); 7931556Srgrimes continue; 7941556Srgrimes } 7951556Srgrimes pungetc(); 7961556Srgrimes goto breakloop; 7971556Srgrimes case '\n': 7981556Srgrimes plinno++; 7991556Srgrimes needprompt = doprompt; 8001556Srgrimes RETURN(TNL); 8011556Srgrimes case PEOF: 8021556Srgrimes RETURN(TEOF); 8031556Srgrimes case '&': 8041556Srgrimes if (pgetc() == '&') 8051556Srgrimes RETURN(TAND); 8061556Srgrimes pungetc(); 8071556Srgrimes RETURN(TBACKGND); 8081556Srgrimes case '|': 8091556Srgrimes if (pgetc() == '|') 8101556Srgrimes RETURN(TOR); 8111556Srgrimes pungetc(); 8121556Srgrimes RETURN(TPIPE); 8131556Srgrimes case ';': 8141556Srgrimes if (pgetc() == ';') 8151556Srgrimes RETURN(TENDCASE); 8161556Srgrimes pungetc(); 8171556Srgrimes RETURN(TSEMI); 8181556Srgrimes case '(': 8191556Srgrimes RETURN(TLP); 8201556Srgrimes case ')': 8211556Srgrimes RETURN(TRP); 8221556Srgrimes default: 8231556Srgrimes goto breakloop; 8241556Srgrimes } 8251556Srgrimes } 8261556Srgrimesbreakloop: 8271556Srgrimes return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 8281556Srgrimes#undef RETURN 8291556Srgrimes} 8301556Srgrimes 8311556Srgrimes 8321556Srgrimes 8331556Srgrimes/* 8341556Srgrimes * If eofmark is NULL, read a word or a redirection symbol. If eofmark 8351556Srgrimes * is not NULL, read a here document. In the latter case, eofmark is the 8361556Srgrimes * word which marks the end of the document and striptabs is true if 8371556Srgrimes * leading tabs should be stripped from the document. The argument firstc 8381556Srgrimes * is the first character of the input token or document. 8391556Srgrimes * 8401556Srgrimes * Because C does not have internal subroutines, I have simulated them 8411556Srgrimes * using goto's to implement the subroutine linkage. The following macros 8421556Srgrimes * will run code that appears at the end of readtoken1. 8431556Srgrimes */ 8441556Srgrimes 8451556Srgrimes#define CHECKEND() {goto checkend; checkend_return:;} 8461556Srgrimes#define PARSEREDIR() {goto parseredir; parseredir_return:;} 8471556Srgrimes#define PARSESUB() {goto parsesub; parsesub_return:;} 8481556Srgrimes#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} 8491556Srgrimes#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} 8501556Srgrimes#define PARSEARITH() {goto parsearith; parsearith_return:;} 8511556Srgrimes 8521556SrgrimesSTATIC int 8531556Srgrimesreadtoken1(firstc, syntax, eofmark, striptabs) 8541556Srgrimes int firstc; 8551556Srgrimes char const *syntax; 8561556Srgrimes char *eofmark; 8571556Srgrimes int striptabs; 8581556Srgrimes { 85917987Speter int c = firstc; 86017987Speter char *out; 8611556Srgrimes int len; 8621556Srgrimes char line[EOFMARKLEN + 1]; 8631556Srgrimes struct nodelist *bqlist; 8641556Srgrimes int quotef; 8651556Srgrimes int dblquote; 8661556Srgrimes int varnest; /* levels of variables expansion */ 8671556Srgrimes int arinest; /* levels of arithmetic expansion */ 8681556Srgrimes int parenlevel; /* levels of parens in arithmetic */ 8691556Srgrimes int oldstyle; 8701556Srgrimes char const *prevsyntax; /* syntax before arithmetic */ 87154679Scracauer int synentry; 87217987Speter#if __GNUC__ 87317987Speter /* Avoid longjmp clobbering */ 87417987Speter (void) &out; 87517987Speter (void) "ef; 87617987Speter (void) &dblquote; 87717987Speter (void) &varnest; 87817987Speter (void) &arinest; 87917987Speter (void) &parenlevel; 88017987Speter (void) &oldstyle; 88117987Speter (void) &prevsyntax; 88217987Speter (void) &syntax; 88354679Scracauer (void) &synentry; 88417987Speter#endif 8851556Srgrimes 8861556Srgrimes startlinno = plinno; 8871556Srgrimes dblquote = 0; 8881556Srgrimes if (syntax == DQSYNTAX) 8891556Srgrimes dblquote = 1; 8901556Srgrimes quotef = 0; 8911556Srgrimes bqlist = NULL; 8921556Srgrimes varnest = 0; 8931556Srgrimes arinest = 0; 8941556Srgrimes parenlevel = 0; 8951556Srgrimes 8961556Srgrimes STARTSTACKSTR(out); 8971556Srgrimes loop: { /* for each line, until end of word */ 8981556Srgrimes#if ATTY 8991556Srgrimes if (c == '\034' && doprompt 9001556Srgrimes && attyset() && ! equal(termval(), "emacs")) { 9011556Srgrimes attyline(); 9021556Srgrimes if (syntax == BASESYNTAX) 9031556Srgrimes return readtoken(); 9041556Srgrimes c = pgetc(); 9051556Srgrimes goto loop; 9061556Srgrimes } 9071556Srgrimes#endif 9081556Srgrimes CHECKEND(); /* set c to PEOF if at end of here document */ 9091556Srgrimes for (;;) { /* until end of line or end of word */ 9101556Srgrimes CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ 91154679Scracauer 91264705Scracauer synentry = syntax[c]; 91354679Scracauer 91454679Scracauer switch(synentry) { 9151556Srgrimes case CNL: /* '\n' */ 9161556Srgrimes if (syntax == BASESYNTAX) 9171556Srgrimes goto endword; /* exit outer loop */ 9181556Srgrimes USTPUTC(c, out); 9191556Srgrimes plinno++; 9201556Srgrimes if (doprompt) 9211556Srgrimes setprompt(2); 9221556Srgrimes else 9231556Srgrimes setprompt(0); 9241556Srgrimes c = pgetc(); 9251556Srgrimes goto loop; /* continue outer loop */ 9261556Srgrimes case CWORD: 9271556Srgrimes USTPUTC(c, out); 9281556Srgrimes break; 9291556Srgrimes case CCTL: 9301556Srgrimes if (eofmark == NULL || dblquote) 9311556Srgrimes USTPUTC(CTLESC, out); 9321556Srgrimes USTPUTC(c, out); 9331556Srgrimes break; 9341556Srgrimes case CBACK: /* backslash */ 9351556Srgrimes c = pgetc(); 9361556Srgrimes if (c == PEOF) { 9371556Srgrimes USTPUTC('\\', out); 9381556Srgrimes pungetc(); 9391556Srgrimes } else if (c == '\n') { 9401556Srgrimes if (doprompt) 9411556Srgrimes setprompt(2); 9421556Srgrimes else 9431556Srgrimes setprompt(0); 9441556Srgrimes } else { 94554631Scracauer if (dblquote && c != '\\' && 94654631Scracauer c != '`' && c != '$' && 94754631Scracauer (c != '"' || eofmark != NULL)) 9481556Srgrimes USTPUTC('\\', out); 94954631Scracauer if (c >= 0 && SQSYNTAX[c] == CCTL) 9501556Srgrimes USTPUTC(CTLESC, out); 95139137Stegge else if (eofmark == NULL) 95238887Stegge USTPUTC(CTLQUOTEMARK, out); 9531556Srgrimes USTPUTC(c, out); 9541556Srgrimes quotef++; 9551556Srgrimes } 9561556Srgrimes break; 9571556Srgrimes case CSQUOTE: 95839137Stegge if (eofmark == NULL) 95939137Stegge USTPUTC(CTLQUOTEMARK, out); 9601556Srgrimes syntax = SQSYNTAX; 9611556Srgrimes break; 9621556Srgrimes case CDQUOTE: 96339137Stegge if (eofmark == NULL) 96439137Stegge USTPUTC(CTLQUOTEMARK, out); 9651556Srgrimes syntax = DQSYNTAX; 9661556Srgrimes dblquote = 1; 9671556Srgrimes break; 9681556Srgrimes case CENDQUOTE: 96939137Stegge if (eofmark != NULL && arinest == 0 && 97039137Stegge varnest == 0) { 9711556Srgrimes USTPUTC(c, out); 9721556Srgrimes } else { 97339137Stegge if (arinest) { 9741556Srgrimes syntax = ARISYNTAX; 97539137Stegge dblquote = 0; 97639137Stegge } else if (eofmark == NULL) { 9771556Srgrimes syntax = BASESYNTAX; 97839137Stegge dblquote = 0; 97939137Stegge } 9801556Srgrimes quotef++; 9811556Srgrimes } 9821556Srgrimes break; 9831556Srgrimes case CVAR: /* '$' */ 9841556Srgrimes PARSESUB(); /* parse substitution */ 9851556Srgrimes break; 9861556Srgrimes case CENDVAR: /* '}' */ 9871556Srgrimes if (varnest > 0) { 9881556Srgrimes varnest--; 9891556Srgrimes USTPUTC(CTLENDVAR, out); 9901556Srgrimes } else { 9911556Srgrimes USTPUTC(c, out); 9921556Srgrimes } 9931556Srgrimes break; 9941556Srgrimes case CLP: /* '(' in arithmetic */ 9951556Srgrimes parenlevel++; 9961556Srgrimes USTPUTC(c, out); 9971556Srgrimes break; 9981556Srgrimes case CRP: /* ')' in arithmetic */ 9991556Srgrimes if (parenlevel > 0) { 10001556Srgrimes USTPUTC(c, out); 10011556Srgrimes --parenlevel; 10021556Srgrimes } else { 10031556Srgrimes if (pgetc() == ')') { 10041556Srgrimes if (--arinest == 0) { 10051556Srgrimes USTPUTC(CTLENDARI, out); 10061556Srgrimes syntax = prevsyntax; 100739137Stegge if (syntax == DQSYNTAX) 100839137Stegge dblquote = 1; 100939137Stegge else 101039137Stegge dblquote = 0; 10111556Srgrimes } else 10121556Srgrimes USTPUTC(')', out); 10131556Srgrimes } else { 10148855Srgrimes /* 10151556Srgrimes * unbalanced parens 10161556Srgrimes * (don't 2nd guess - no error) 10171556Srgrimes */ 10181556Srgrimes pungetc(); 10191556Srgrimes USTPUTC(')', out); 10201556Srgrimes } 10211556Srgrimes } 10221556Srgrimes break; 10231556Srgrimes case CBQUOTE: /* '`' */ 10241556Srgrimes PARSEBACKQOLD(); 10251556Srgrimes break; 10261556Srgrimes case CEOF: 10271556Srgrimes goto endword; /* exit outer loop */ 10281556Srgrimes default: 10291556Srgrimes if (varnest == 0) 10301556Srgrimes goto endword; /* exit outer loop */ 10311556Srgrimes USTPUTC(c, out); 10321556Srgrimes } 10331556Srgrimes c = pgetc_macro(); 10341556Srgrimes } 10351556Srgrimes } 10361556Srgrimesendword: 10371556Srgrimes if (syntax == ARISYNTAX) 10381556Srgrimes synerror("Missing '))'"); 10391556Srgrimes if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL) 10401556Srgrimes synerror("Unterminated quoted string"); 10411556Srgrimes if (varnest != 0) { 10421556Srgrimes startlinno = plinno; 10431556Srgrimes synerror("Missing '}'"); 10441556Srgrimes } 10451556Srgrimes USTPUTC('\0', out); 10461556Srgrimes len = out - stackblock(); 10471556Srgrimes out = stackblock(); 10481556Srgrimes if (eofmark == NULL) { 10491556Srgrimes if ((c == '>' || c == '<') 10501556Srgrimes && quotef == 0 10511556Srgrimes && len <= 2 10521556Srgrimes && (*out == '\0' || is_digit(*out))) { 10531556Srgrimes PARSEREDIR(); 10541556Srgrimes return lasttoken = TREDIR; 10551556Srgrimes } else { 10561556Srgrimes pungetc(); 10571556Srgrimes } 10581556Srgrimes } 10591556Srgrimes quoteflag = quotef; 10601556Srgrimes backquotelist = bqlist; 10611556Srgrimes grabstackblock(len); 10621556Srgrimes wordtext = out; 10631556Srgrimes return lasttoken = TWORD; 10641556Srgrimes/* end of readtoken routine */ 10651556Srgrimes 10661556Srgrimes 10671556Srgrimes 10681556Srgrimes/* 10691556Srgrimes * Check to see whether we are at the end of the here document. When this 10701556Srgrimes * is called, c is set to the first character of the next input line. If 10711556Srgrimes * we are at the end of the here document, this routine sets the c to PEOF. 10721556Srgrimes */ 10731556Srgrimes 10741556Srgrimescheckend: { 10751556Srgrimes if (eofmark) { 10761556Srgrimes if (striptabs) { 10771556Srgrimes while (c == '\t') 10781556Srgrimes c = pgetc(); 10791556Srgrimes } 10801556Srgrimes if (c == *eofmark) { 10811556Srgrimes if (pfgets(line, sizeof line) != NULL) { 108225230Ssteve char *p, *q; 10831556Srgrimes 10841556Srgrimes p = line; 10851556Srgrimes for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 10861556Srgrimes if (*p == '\n' && *q == '\0') { 10871556Srgrimes c = PEOF; 10881556Srgrimes plinno++; 10891556Srgrimes needprompt = doprompt; 10901556Srgrimes } else { 10911556Srgrimes pushstring(line, strlen(line), NULL); 10921556Srgrimes } 10931556Srgrimes } 10941556Srgrimes } 10951556Srgrimes } 10961556Srgrimes goto checkend_return; 10971556Srgrimes} 10981556Srgrimes 10991556Srgrimes 11001556Srgrimes/* 11011556Srgrimes * Parse a redirection operator. The variable "out" points to a string 11021556Srgrimes * specifying the fd to be redirected. The variable "c" contains the 11031556Srgrimes * first character of the redirection operator. 11041556Srgrimes */ 11051556Srgrimes 11061556Srgrimesparseredir: { 11071556Srgrimes char fd = *out; 11081556Srgrimes union node *np; 11091556Srgrimes 11101556Srgrimes np = (union node *)stalloc(sizeof (struct nfile)); 11111556Srgrimes if (c == '>') { 11121556Srgrimes np->nfile.fd = 1; 11131556Srgrimes c = pgetc(); 11141556Srgrimes if (c == '>') 11151556Srgrimes np->type = NAPPEND; 11161556Srgrimes else if (c == '&') 11171556Srgrimes np->type = NTOFD; 11181556Srgrimes else { 11191556Srgrimes np->type = NTO; 11201556Srgrimes pungetc(); 11211556Srgrimes } 11221556Srgrimes } else { /* c == '<' */ 11231556Srgrimes np->nfile.fd = 0; 11241556Srgrimes c = pgetc(); 11251556Srgrimes if (c == '<') { 11261556Srgrimes if (sizeof (struct nfile) != sizeof (struct nhere)) { 11271556Srgrimes np = (union node *)stalloc(sizeof (struct nhere)); 11281556Srgrimes np->nfile.fd = 0; 11291556Srgrimes } 11301556Srgrimes np->type = NHERE; 11311556Srgrimes heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 11321556Srgrimes heredoc->here = np; 11331556Srgrimes if ((c = pgetc()) == '-') { 11341556Srgrimes heredoc->striptabs = 1; 11351556Srgrimes } else { 11361556Srgrimes heredoc->striptabs = 0; 11371556Srgrimes pungetc(); 11381556Srgrimes } 11391556Srgrimes } else if (c == '&') 11401556Srgrimes np->type = NFROMFD; 114166612Sbrian else if (c == '>') 114266612Sbrian np->type = NFROMTO; 11431556Srgrimes else { 11441556Srgrimes np->type = NFROM; 11451556Srgrimes pungetc(); 11461556Srgrimes } 11471556Srgrimes } 11481556Srgrimes if (fd != '\0') 11491556Srgrimes np->nfile.fd = digit_val(fd); 11501556Srgrimes redirnode = np; 11511556Srgrimes goto parseredir_return; 11521556Srgrimes} 11531556Srgrimes 11541556Srgrimes 11551556Srgrimes/* 11561556Srgrimes * Parse a substitution. At this point, we have read the dollar sign 11571556Srgrimes * and nothing else. 11581556Srgrimes */ 11591556Srgrimes 11601556Srgrimesparsesub: { 11611556Srgrimes int subtype; 11621556Srgrimes int typeloc; 11631556Srgrimes int flags; 11641556Srgrimes char *p; 11651556Srgrimes#ifndef GDB_HACK 11661556Srgrimes static const char types[] = "}-+?="; 11671556Srgrimes#endif 116818202Speter int bracketed_name = 0; /* used to handle ${[0-9]*} variables */ 11691556Srgrimes 11701556Srgrimes c = pgetc(); 11711556Srgrimes if (c != '(' && c != '{' && !is_name(c) && !is_special(c)) { 11721556Srgrimes USTPUTC('$', out); 11731556Srgrimes pungetc(); 11741556Srgrimes } else if (c == '(') { /* $(command) or $((arith)) */ 11751556Srgrimes if (pgetc() == '(') { 11761556Srgrimes PARSEARITH(); 11771556Srgrimes } else { 11781556Srgrimes pungetc(); 11791556Srgrimes PARSEBACKQNEW(); 11801556Srgrimes } 11811556Srgrimes } else { 11821556Srgrimes USTPUTC(CTLVAR, out); 11831556Srgrimes typeloc = out - stackblock(); 11841556Srgrimes USTPUTC(VSNORMAL, out); 11851556Srgrimes subtype = VSNORMAL; 11861556Srgrimes if (c == '{') { 118718202Speter bracketed_name = 1; 11881556Srgrimes c = pgetc(); 118917987Speter if (c == '#') { 119017987Speter if ((c = pgetc()) == '}') 119117987Speter c = '#'; 119217987Speter else 119317987Speter subtype = VSLENGTH; 119417987Speter } 119517987Speter else 119617987Speter subtype = 0; 11971556Srgrimes } 11981556Srgrimes if (is_name(c)) { 11991556Srgrimes do { 12001556Srgrimes STPUTC(c, out); 12011556Srgrimes c = pgetc(); 12021556Srgrimes } while (is_in_name(c)); 120318202Speter } else if (is_digit(c)) { 120418202Speter if (bracketed_name) { 120518202Speter do { 120618202Speter STPUTC(c, out); 120718202Speter c = pgetc(); 120818202Speter } while (is_digit(c)); 120918202Speter } else { 121018202Speter STPUTC(c, out); 121118202Speter c = pgetc(); 121218202Speter } 12131556Srgrimes } else { 12141556Srgrimes if (! is_special(c)) 12151556Srgrimesbadsub: synerror("Bad substitution"); 12161556Srgrimes USTPUTC(c, out); 12171556Srgrimes c = pgetc(); 12181556Srgrimes } 12191556Srgrimes STPUTC('=', out); 12201556Srgrimes flags = 0; 12211556Srgrimes if (subtype == 0) { 122217987Speter switch (c) { 122317987Speter case ':': 12241556Srgrimes flags = VSNUL; 12251556Srgrimes c = pgetc(); 122617987Speter /*FALLTHROUGH*/ 122717987Speter default: 122817987Speter p = strchr(types, c); 122917987Speter if (p == NULL) 123017987Speter goto badsub; 123117987Speter subtype = p - types + VSNORMAL; 123217987Speter break; 123317987Speter case '%': 123420425Ssteve case '#': 123517987Speter { 123617987Speter int cc = c; 123717987Speter subtype = c == '#' ? VSTRIMLEFT : 123817987Speter VSTRIMRIGHT; 123917987Speter c = pgetc(); 124017987Speter if (c == cc) 124117987Speter subtype++; 124217987Speter else 124317987Speter pungetc(); 124417987Speter break; 124517987Speter } 12461556Srgrimes } 12471556Srgrimes } else { 12481556Srgrimes pungetc(); 12491556Srgrimes } 125057225Scracauer if (subtype != VSLENGTH && (dblquote || arinest)) 12511556Srgrimes flags |= VSQUOTE; 12521556Srgrimes *(stackblock() + typeloc) = subtype | flags; 12531556Srgrimes if (subtype != VSNORMAL) 12541556Srgrimes varnest++; 12551556Srgrimes } 12561556Srgrimes goto parsesub_return; 12571556Srgrimes} 12581556Srgrimes 12591556Srgrimes 12601556Srgrimes/* 12611556Srgrimes * Called to parse command substitutions. Newstyle is set if the command 12621556Srgrimes * is enclosed inside $(...); nlpp is a pointer to the head of the linked 12631556Srgrimes * list of commands (passed by reference), and savelen is the number of 12641556Srgrimes * characters on the top of the stack which must be preserved. 12651556Srgrimes */ 12661556Srgrimes 12671556Srgrimesparsebackq: { 12681556Srgrimes struct nodelist **nlpp; 12691556Srgrimes int savepbq; 12701556Srgrimes union node *n; 12711556Srgrimes char *volatile str; 12721556Srgrimes struct jmploc jmploc; 12731556Srgrimes struct jmploc *volatile savehandler; 12741556Srgrimes int savelen; 127520425Ssteve int saveprompt; 127620425Ssteve#if __GNUC__ 127720425Ssteve /* Avoid longjmp clobbering */ 127820425Ssteve (void) &saveprompt; 127920425Ssteve#endif 12801556Srgrimes 12811556Srgrimes savepbq = parsebackquote; 12821556Srgrimes if (setjmp(jmploc.loc)) { 12831556Srgrimes if (str) 12841556Srgrimes ckfree(str); 12851556Srgrimes parsebackquote = 0; 12861556Srgrimes handler = savehandler; 12871556Srgrimes longjmp(handler->loc, 1); 12881556Srgrimes } 12891556Srgrimes INTOFF; 12901556Srgrimes str = NULL; 12911556Srgrimes savelen = out - stackblock(); 12921556Srgrimes if (savelen > 0) { 12931556Srgrimes str = ckmalloc(savelen); 129417987Speter memcpy(str, stackblock(), savelen); 12951556Srgrimes } 12961556Srgrimes savehandler = handler; 12971556Srgrimes handler = &jmploc; 12981556Srgrimes INTON; 12991556Srgrimes if (oldstyle) { 13001556Srgrimes /* We must read until the closing backquote, giving special 13011556Srgrimes treatment to some slashes, and then push the string and 13021556Srgrimes reread it as input, interpreting it normally. */ 130325230Ssteve char *out; 130425230Ssteve int c; 13051556Srgrimes int savelen; 13061556Srgrimes char *str; 13078855Srgrimes 130820425Ssteve 13091556Srgrimes STARTSTACKSTR(out); 131020425Ssteve for (;;) { 131120425Ssteve if (needprompt) { 131220425Ssteve setprompt(2); 131320425Ssteve needprompt = 0; 131420425Ssteve } 131520425Ssteve switch (c = pgetc()) { 131620425Ssteve case '`': 131720425Ssteve goto done; 131820425Ssteve 131920425Ssteve case '\\': 132020425Ssteve if ((c = pgetc()) == '\n') { 132120425Ssteve plinno++; 132220425Ssteve if (doprompt) 132320425Ssteve setprompt(2); 132420425Ssteve else 132520425Ssteve setprompt(0); 132620425Ssteve /* 132720425Ssteve * If eating a newline, avoid putting 132820425Ssteve * the newline into the new character 132920425Ssteve * stream (via the STPUTC after the 133020425Ssteve * switch). 133120425Ssteve */ 133220425Ssteve continue; 133320425Ssteve } 133417987Speter if (c != '\\' && c != '`' && c != '$' 13351556Srgrimes && (!dblquote || c != '"')) 13361556Srgrimes STPUTC('\\', out); 133720425Ssteve break; 133820425Ssteve 133920425Ssteve case '\n': 134020425Ssteve plinno++; 134120425Ssteve needprompt = doprompt; 134220425Ssteve break; 134320425Ssteve 134420425Ssteve case PEOF: 134520425Ssteve startlinno = plinno; 134620425Ssteve synerror("EOF in backquote substitution"); 134720425Ssteve break; 134820425Ssteve 134920425Ssteve default: 135020425Ssteve break; 135120425Ssteve } 135220425Ssteve STPUTC(c, out); 13531556Srgrimes } 135420425Sstevedone: 13551556Srgrimes STPUTC('\0', out); 13561556Srgrimes savelen = out - stackblock(); 13571556Srgrimes if (savelen > 0) { 13581556Srgrimes str = ckmalloc(savelen); 135917987Speter memcpy(str, stackblock(), savelen); 136017987Speter setinputstring(str, 1); 13611556Srgrimes } 13621556Srgrimes } 13631556Srgrimes nlpp = &bqlist; 13641556Srgrimes while (*nlpp) 13651556Srgrimes nlpp = &(*nlpp)->next; 13661556Srgrimes *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 13671556Srgrimes (*nlpp)->next = NULL; 13681556Srgrimes parsebackquote = oldstyle; 136920425Ssteve 137020425Ssteve if (oldstyle) { 137120425Ssteve saveprompt = doprompt; 137220425Ssteve doprompt = 0; 137320425Ssteve } 137420425Ssteve 13751556Srgrimes n = list(0); 137620425Ssteve 137720425Ssteve if (oldstyle) 137820425Ssteve doprompt = saveprompt; 137920425Ssteve else { 138020425Ssteve if (readtoken() != TRP) 138120425Ssteve synexpect(TRP); 138220425Ssteve } 138320425Ssteve 13841556Srgrimes (*nlpp)->n = n; 138520425Ssteve if (oldstyle) { 138620425Ssteve /* 138720425Ssteve * Start reading from old file again, ignoring any pushed back 138820425Ssteve * tokens left from the backquote parsing 138920425Ssteve */ 13901556Srgrimes popfile(); 139120425Ssteve tokpushback = 0; 139220425Ssteve } 13931556Srgrimes while (stackblocksize() <= savelen) 13941556Srgrimes growstackblock(); 13951556Srgrimes STARTSTACKSTR(out); 13961556Srgrimes if (str) { 139717987Speter memcpy(out, str, savelen); 13981556Srgrimes STADJUST(savelen, out); 13991556Srgrimes INTOFF; 14001556Srgrimes ckfree(str); 14011556Srgrimes str = NULL; 14021556Srgrimes INTON; 14031556Srgrimes } 14041556Srgrimes parsebackquote = savepbq; 14051556Srgrimes handler = savehandler; 14061556Srgrimes if (arinest || dblquote) 14071556Srgrimes USTPUTC(CTLBACKQ | CTLQUOTE, out); 14081556Srgrimes else 14091556Srgrimes USTPUTC(CTLBACKQ, out); 14101556Srgrimes if (oldstyle) 14111556Srgrimes goto parsebackq_oldreturn; 14121556Srgrimes else 14131556Srgrimes goto parsebackq_newreturn; 14141556Srgrimes} 14151556Srgrimes 14161556Srgrimes/* 14171556Srgrimes * Parse an arithmetic expansion (indicate start of one and set state) 14181556Srgrimes */ 14191556Srgrimesparsearith: { 14201556Srgrimes 14211556Srgrimes if (++arinest == 1) { 14221556Srgrimes prevsyntax = syntax; 14231556Srgrimes syntax = ARISYNTAX; 14241556Srgrimes USTPUTC(CTLARI, out); 142538887Stegge if (dblquote) 142638887Stegge USTPUTC('"',out); 142738887Stegge else 142838887Stegge USTPUTC(' ',out); 14291556Srgrimes } else { 14301556Srgrimes /* 14311556Srgrimes * we collapse embedded arithmetic expansion to 14321556Srgrimes * parenthesis, which should be equivalent 14331556Srgrimes */ 14341556Srgrimes USTPUTC('(', out); 14351556Srgrimes } 14361556Srgrimes goto parsearith_return; 14371556Srgrimes} 14381556Srgrimes 14391556Srgrimes} /* end of readtoken */ 14401556Srgrimes 14411556Srgrimes 14421556Srgrimes 14431556Srgrimes#ifdef mkinit 14441556SrgrimesRESET { 14451556Srgrimes tokpushback = 0; 14461556Srgrimes checkkwd = 0; 14471556Srgrimes} 14481556Srgrimes#endif 14491556Srgrimes 14501556Srgrimes/* 14511556Srgrimes * Returns true if the text contains nothing to expand (no dollar signs 14521556Srgrimes * or backquotes). 14531556Srgrimes */ 14541556Srgrimes 14551556SrgrimesSTATIC int 14561556Srgrimesnoexpand(text) 14571556Srgrimes char *text; 14581556Srgrimes { 145925230Ssteve char *p; 146025230Ssteve char c; 14611556Srgrimes 14621556Srgrimes p = text; 14631556Srgrimes while ((c = *p++) != '\0') { 146439137Stegge if ( c == CTLQUOTEMARK) 146539137Stegge continue; 14661556Srgrimes if (c == CTLESC) 14671556Srgrimes p++; 146854631Scracauer else if (c >= 0 && BASESYNTAX[(int)c] == CCTL) 14691556Srgrimes return 0; 14701556Srgrimes } 14711556Srgrimes return 1; 14721556Srgrimes} 14731556Srgrimes 14741556Srgrimes 14751556Srgrimes/* 14761556Srgrimes * Return true if the argument is a legal variable name (a letter or 14771556Srgrimes * underscore followed by zero or more letters, underscores, and digits). 14781556Srgrimes */ 14791556Srgrimes 14801556Srgrimesint 14811556Srgrimesgoodname(name) 14821556Srgrimes char *name; 14831556Srgrimes { 148425230Ssteve char *p; 14851556Srgrimes 14861556Srgrimes p = name; 14871556Srgrimes if (! is_name(*p)) 14881556Srgrimes return 0; 14891556Srgrimes while (*++p) { 14901556Srgrimes if (! is_in_name(*p)) 14911556Srgrimes return 0; 14921556Srgrimes } 14931556Srgrimes return 1; 14941556Srgrimes} 14951556Srgrimes 14961556Srgrimes 14971556Srgrimes/* 14981556Srgrimes * Called when an unexpected token is read during the parse. The argument 14991556Srgrimes * is the token that is expected, or -1 if more than one type of token can 15001556Srgrimes * occur at this point. 15011556Srgrimes */ 15021556Srgrimes 15031556SrgrimesSTATIC void 150420425Sstevesynexpect(token) 150517987Speter int token; 150617987Speter{ 15071556Srgrimes char msg[64]; 15081556Srgrimes 15091556Srgrimes if (token >= 0) { 15101556Srgrimes fmtstr(msg, 64, "%s unexpected (expecting %s)", 15111556Srgrimes tokname[lasttoken], tokname[token]); 15121556Srgrimes } else { 15131556Srgrimes fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 15141556Srgrimes } 15151556Srgrimes synerror(msg); 15161556Srgrimes} 15171556Srgrimes 15181556Srgrimes 15191556SrgrimesSTATIC void 15201556Srgrimessynerror(msg) 15211556Srgrimes char *msg; 15221556Srgrimes { 15231556Srgrimes if (commandname) 15241556Srgrimes outfmt(&errout, "%s: %d: ", commandname, startlinno); 15251556Srgrimes outfmt(&errout, "Syntax error: %s\n", msg); 15261556Srgrimes error((char *)NULL); 15271556Srgrimes} 15281556Srgrimes 15291556SrgrimesSTATIC void 15301556Srgrimessetprompt(which) 15311556Srgrimes int which; 15321556Srgrimes { 15331556Srgrimes whichprompt = which; 15341556Srgrimes 153517987Speter#ifndef NO_HISTORY 15361556Srgrimes if (!el) 153717987Speter#endif 15381556Srgrimes out2str(getprompt(NULL)); 15391556Srgrimes} 15401556Srgrimes 15411556Srgrimes/* 15421556Srgrimes * called by editline -- any expansions to the prompt 15431556Srgrimes * should be added here. 15441556Srgrimes */ 15451556Srgrimeschar * 15461556Srgrimesgetprompt(unused) 154725905Ssteve void *unused __unused; 154825905Ssteve{ 15491556Srgrimes switch (whichprompt) { 15501556Srgrimes case 0: 15511556Srgrimes return ""; 15521556Srgrimes case 1: 15531556Srgrimes return ps1val(); 15541556Srgrimes case 2: 15551556Srgrimes return ps2val(); 15561556Srgrimes default: 15571556Srgrimes return "<internal prompt error>"; 15581556Srgrimes } 15591556Srgrimes} 1560