parser.c revision 101662
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 411556Srgrimes#endif /* not lint */ 4299110Sobrien#include <sys/cdefs.h> 4399110Sobrien__FBSDID("$FreeBSD: head/bin/sh/parser.c 101662 2002-08-11 03:04:23Z tjr $"); 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 11190111SimpSTATIC union node *list(int); 11290111SimpSTATIC union node *andor(void); 11390111SimpSTATIC union node *pipeline(void); 11490111SimpSTATIC union node *command(void); 11590111SimpSTATIC union node *simplecmd(union node **, union node *); 11690111SimpSTATIC union node *makename(void); 11790111SimpSTATIC void parsefname(void); 11890111SimpSTATIC void parseheredoc(void); 11990111SimpSTATIC int peektoken(void); 12090111SimpSTATIC int readtoken(void); 12190111SimpSTATIC int xxreadtoken(void); 12290111SimpSTATIC int readtoken1(int, char const *, char *, int); 12390111SimpSTATIC int noexpand(char *); 12490111SimpSTATIC void synexpect(int); 12590111SimpSTATIC void synerror(char *); 12690111SimpSTATIC void setprompt(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 * 13590111Simpparsecmd(int interact) 13617987Speter{ 1371556Srgrimes int t; 1381556Srgrimes 13960593Scracauer tokpushback = 0; 1401556Srgrimes doprompt = interact; 1411556Srgrimes if (doprompt) 1421556Srgrimes setprompt(1); 1431556Srgrimes else 1441556Srgrimes setprompt(0); 1451556Srgrimes needprompt = 0; 1461556Srgrimes t = readtoken(); 1471556Srgrimes if (t == TEOF) 1481556Srgrimes return NEOF; 1491556Srgrimes if (t == TNL) 1501556Srgrimes return NULL; 1511556Srgrimes tokpushback++; 1521556Srgrimes return list(1); 1531556Srgrimes} 1541556Srgrimes 1551556Srgrimes 1561556SrgrimesSTATIC union node * 15790111Simplist(int nlflag) 15817987Speter{ 1591556Srgrimes union node *n1, *n2, *n3; 16017987Speter int tok; 1611556Srgrimes 1621556Srgrimes checkkwd = 2; 1631556Srgrimes if (nlflag == 0 && tokendlist[peektoken()]) 1641556Srgrimes return NULL; 16517987Speter n1 = NULL; 1661556Srgrimes for (;;) { 16717987Speter n2 = andor(); 16817987Speter tok = readtoken(); 16917987Speter if (tok == TBACKGND) { 17017987Speter if (n2->type == NCMD || n2->type == NPIPE) { 17117987Speter n2->ncmd.backgnd = 1; 17217987Speter } else if (n2->type == NREDIR) { 17317987Speter n2->type = NBACKGND; 17417987Speter } else { 17517987Speter n3 = (union node *)stalloc(sizeof (struct nredir)); 17617987Speter n3->type = NBACKGND; 17717987Speter n3->nredir.n = n2; 17817987Speter n3->nredir.redirect = NULL; 17917987Speter n2 = n3; 18017987Speter } 18117987Speter } 18217987Speter if (n1 == NULL) { 18317987Speter n1 = n2; 18417987Speter } 18517987Speter else { 18617987Speter n3 = (union node *)stalloc(sizeof (struct nbinary)); 18717987Speter n3->type = NSEMI; 18817987Speter n3->nbinary.ch1 = n1; 18917987Speter n3->nbinary.ch2 = n2; 19017987Speter n1 = n3; 19117987Speter } 19217987Speter switch (tok) { 19313882Sjoerg case TBACKGND: 19417987Speter case TSEMI: 19517987Speter tok = readtoken(); 19617987Speter /* fall through */ 1971556Srgrimes case TNL: 19817987Speter if (tok == TNL) { 19917987Speter parseheredoc(); 20017987Speter if (nlflag) 20117987Speter return n1; 20217987Speter } else { 20317987Speter tokpushback++; 20417987Speter } 2051556Srgrimes checkkwd = 2; 2061556Srgrimes if (tokendlist[peektoken()]) 2071556Srgrimes return n1; 2081556Srgrimes break; 2091556Srgrimes case TEOF: 2101556Srgrimes if (heredoclist) 2111556Srgrimes parseheredoc(); 2121556Srgrimes else 2131556Srgrimes pungetc(); /* push back EOF on input */ 2141556Srgrimes return n1; 2151556Srgrimes default: 2161556Srgrimes if (nlflag) 2171556Srgrimes synexpect(-1); 2181556Srgrimes tokpushback++; 2191556Srgrimes return n1; 2201556Srgrimes } 2211556Srgrimes } 2221556Srgrimes} 2231556Srgrimes 2241556Srgrimes 2251556Srgrimes 2261556SrgrimesSTATIC union node * 22790111Simpandor(void) 22890111Simp{ 2291556Srgrimes union node *n1, *n2, *n3; 2301556Srgrimes int t; 2311556Srgrimes 2321556Srgrimes n1 = pipeline(); 2331556Srgrimes for (;;) { 2341556Srgrimes if ((t = readtoken()) == TAND) { 2351556Srgrimes t = NAND; 2361556Srgrimes } else if (t == TOR) { 2371556Srgrimes t = NOR; 2381556Srgrimes } else { 2391556Srgrimes tokpushback++; 2401556Srgrimes return n1; 2411556Srgrimes } 2421556Srgrimes n2 = pipeline(); 2431556Srgrimes n3 = (union node *)stalloc(sizeof (struct nbinary)); 2441556Srgrimes n3->type = t; 2451556Srgrimes n3->nbinary.ch1 = n1; 2461556Srgrimes n3->nbinary.ch2 = n2; 2471556Srgrimes n1 = n3; 2481556Srgrimes } 2491556Srgrimes} 2501556Srgrimes 2511556Srgrimes 2521556Srgrimes 2531556SrgrimesSTATIC union node * 25490111Simppipeline(void) 25590111Simp{ 25675336Sbrian union node *n1, *n2, *pipenode; 2571556Srgrimes struct nodelist *lp, *prev; 25875336Sbrian int negate; 2591556Srgrimes 26075336Sbrian negate = 0; 2611556Srgrimes TRACE(("pipeline: entered\n")); 26275336Sbrian while (readtoken() == TNOT) 26375336Sbrian negate = !negate; 26475336Sbrian tokpushback++; 2651556Srgrimes n1 = command(); 2661556Srgrimes if (readtoken() == TPIPE) { 2671556Srgrimes pipenode = (union node *)stalloc(sizeof (struct npipe)); 2681556Srgrimes pipenode->type = NPIPE; 2691556Srgrimes pipenode->npipe.backgnd = 0; 2701556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 2711556Srgrimes pipenode->npipe.cmdlist = lp; 2721556Srgrimes lp->n = n1; 2731556Srgrimes do { 2741556Srgrimes prev = lp; 2751556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 2761556Srgrimes lp->n = command(); 2771556Srgrimes prev->next = lp; 2781556Srgrimes } while (readtoken() == TPIPE); 2791556Srgrimes lp->next = NULL; 2801556Srgrimes n1 = pipenode; 2811556Srgrimes } 2821556Srgrimes tokpushback++; 28375336Sbrian if (negate) { 28475336Sbrian n2 = (union node *)stalloc(sizeof (struct nnot)); 28575336Sbrian n2->type = NNOT; 28675336Sbrian n2->nnot.com = n1; 28775336Sbrian return n2; 28875336Sbrian } else 28975336Sbrian return n1; 2901556Srgrimes} 2911556Srgrimes 2921556Srgrimes 2931556Srgrimes 2941556SrgrimesSTATIC union node * 29590111Simpcommand(void) 29690111Simp{ 2971556Srgrimes union node *n1, *n2; 2981556Srgrimes union node *ap, **app; 2991556Srgrimes union node *cp, **cpp; 3001556Srgrimes union node *redir, **rpp; 30175160Sbrian int t, negate = 0; 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 31675160Sbrian while (readtoken() == TNOT) { 31775160Sbrian TRACE(("command: TNOT recognized\n")); 31875160Sbrian negate = !negate; 31975160Sbrian } 32075160Sbrian tokpushback++; 32175160Sbrian 3221556Srgrimes switch (readtoken()) { 3231556Srgrimes case TIF: 3241556Srgrimes n1 = (union node *)stalloc(sizeof (struct nif)); 3251556Srgrimes n1->type = NIF; 3261556Srgrimes n1->nif.test = list(0); 3271556Srgrimes if (readtoken() != TTHEN) 3281556Srgrimes synexpect(TTHEN); 3291556Srgrimes n1->nif.ifpart = list(0); 3301556Srgrimes n2 = n1; 3311556Srgrimes while (readtoken() == TELIF) { 3321556Srgrimes n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 3331556Srgrimes n2 = n2->nif.elsepart; 3341556Srgrimes n2->type = NIF; 3351556Srgrimes n2->nif.test = list(0); 3361556Srgrimes if (readtoken() != TTHEN) 3371556Srgrimes synexpect(TTHEN); 3381556Srgrimes n2->nif.ifpart = list(0); 3391556Srgrimes } 3401556Srgrimes if (lasttoken == TELSE) 3411556Srgrimes n2->nif.elsepart = list(0); 3421556Srgrimes else { 3431556Srgrimes n2->nif.elsepart = NULL; 3441556Srgrimes tokpushback++; 3451556Srgrimes } 3461556Srgrimes if (readtoken() != TFI) 3471556Srgrimes synexpect(TFI); 3481556Srgrimes checkkwd = 1; 3491556Srgrimes break; 3501556Srgrimes case TWHILE: 3511556Srgrimes case TUNTIL: { 3521556Srgrimes int got; 3531556Srgrimes n1 = (union node *)stalloc(sizeof (struct nbinary)); 3541556Srgrimes n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 3551556Srgrimes n1->nbinary.ch1 = list(0); 3561556Srgrimes if ((got=readtoken()) != TDO) { 3571556SrgrimesTRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 3581556Srgrimes synexpect(TDO); 3591556Srgrimes } 3601556Srgrimes n1->nbinary.ch2 = list(0); 3611556Srgrimes if (readtoken() != TDONE) 3621556Srgrimes synexpect(TDONE); 3631556Srgrimes checkkwd = 1; 3641556Srgrimes break; 3651556Srgrimes } 3661556Srgrimes case TFOR: 3671556Srgrimes if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 3681556Srgrimes synerror("Bad for loop variable"); 3691556Srgrimes n1 = (union node *)stalloc(sizeof (struct nfor)); 3701556Srgrimes n1->type = NFOR; 3711556Srgrimes n1->nfor.var = wordtext; 3721556Srgrimes if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) { 3731556Srgrimes app = ≈ 3741556Srgrimes while (readtoken() == TWORD) { 3751556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 3761556Srgrimes n2->type = NARG; 3771556Srgrimes n2->narg.text = wordtext; 3781556Srgrimes n2->narg.backquote = backquotelist; 3791556Srgrimes *app = n2; 3801556Srgrimes app = &n2->narg.next; 3811556Srgrimes } 3821556Srgrimes *app = NULL; 3831556Srgrimes n1->nfor.args = ap; 3841556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 3851556Srgrimes synexpect(-1); 3861556Srgrimes } else { 3871556Srgrimes#ifndef GDB_HACK 3881556Srgrimes static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, 3891556Srgrimes '@', '=', '\0'}; 3901556Srgrimes#endif 3911556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 3921556Srgrimes n2->type = NARG; 3931556Srgrimes n2->narg.text = (char *)argvars; 3941556Srgrimes n2->narg.backquote = NULL; 3951556Srgrimes n2->narg.next = NULL; 3961556Srgrimes n1->nfor.args = n2; 3971556Srgrimes /* 3981556Srgrimes * Newline or semicolon here is optional (but note 3991556Srgrimes * that the original Bourne shell only allowed NL). 4001556Srgrimes */ 4011556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 4021556Srgrimes tokpushback++; 4031556Srgrimes } 4041556Srgrimes checkkwd = 2; 4051556Srgrimes if ((t = readtoken()) == TDO) 4061556Srgrimes t = TDONE; 4071556Srgrimes else if (t == TBEGIN) 4081556Srgrimes t = TEND; 4091556Srgrimes else 4101556Srgrimes synexpect(-1); 4111556Srgrimes n1->nfor.body = list(0); 4121556Srgrimes if (readtoken() != t) 4131556Srgrimes synexpect(t); 4141556Srgrimes checkkwd = 1; 4151556Srgrimes break; 4161556Srgrimes case TCASE: 4171556Srgrimes n1 = (union node *)stalloc(sizeof (struct ncase)); 4181556Srgrimes n1->type = NCASE; 4191556Srgrimes if (readtoken() != TWORD) 4201556Srgrimes synexpect(TWORD); 4211556Srgrimes n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 4221556Srgrimes n2->type = NARG; 4231556Srgrimes n2->narg.text = wordtext; 4241556Srgrimes n2->narg.backquote = backquotelist; 4251556Srgrimes n2->narg.next = NULL; 4261556Srgrimes while (readtoken() == TNL); 4271556Srgrimes if (lasttoken != TWORD || ! equal(wordtext, "in")) 4281556Srgrimes synerror("expecting \"in\""); 4291556Srgrimes cpp = &n1->ncase.cases; 43018018Speter noaliases = 1; /* turn off alias expansion */ 4312760Ssef checkkwd = 2, readtoken(); 4322760Ssef do { 4331556Srgrimes *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 4341556Srgrimes cp->type = NCLIST; 4351556Srgrimes app = &cp->nclist.pattern; 4361556Srgrimes for (;;) { 4371556Srgrimes *app = ap = (union node *)stalloc(sizeof (struct narg)); 4381556Srgrimes ap->type = NARG; 4391556Srgrimes ap->narg.text = wordtext; 4401556Srgrimes ap->narg.backquote = backquotelist; 4412760Ssef if (checkkwd = 2, readtoken() != TPIPE) 4421556Srgrimes break; 4431556Srgrimes app = &ap->narg.next; 4442760Ssef readtoken(); 4451556Srgrimes } 4461556Srgrimes ap->narg.next = NULL; 4471556Srgrimes if (lasttoken != TRP) 44818018Speter noaliases = 0, synexpect(TRP); 4491556Srgrimes cp->nclist.body = list(0); 4502760Ssef 4512760Ssef checkkwd = 2; 4522760Ssef if ((t = readtoken()) != TESAC) { 4532760Ssef if (t != TENDCASE) 45418018Speter noaliases = 0, synexpect(TENDCASE); 4552760Ssef else 4562760Ssef checkkwd = 2, readtoken(); 4572760Ssef } 4581556Srgrimes cpp = &cp->nclist.next; 4592760Ssef } while(lasttoken != TESAC); 46018018Speter noaliases = 0; /* reset alias expansion */ 4611556Srgrimes *cpp = NULL; 4621556Srgrimes checkkwd = 1; 4631556Srgrimes break; 4641556Srgrimes case TLP: 4651556Srgrimes n1 = (union node *)stalloc(sizeof (struct nredir)); 4661556Srgrimes n1->type = NSUBSHELL; 4671556Srgrimes n1->nredir.n = list(0); 4681556Srgrimes n1->nredir.redirect = NULL; 4691556Srgrimes if (readtoken() != TRP) 4701556Srgrimes synexpect(TRP); 4711556Srgrimes checkkwd = 1; 4721556Srgrimes break; 4731556Srgrimes case TBEGIN: 4741556Srgrimes n1 = list(0); 4751556Srgrimes if (readtoken() != TEND) 4761556Srgrimes synexpect(TEND); 4771556Srgrimes checkkwd = 1; 4781556Srgrimes break; 4791556Srgrimes /* Handle an empty command like other simple commands. */ 48017987Speter case TSEMI: 481101662Stjr case TAND: 482101662Stjr case TOR: 48317987Speter /* 48417987Speter * An empty command before a ; doesn't make much sense, and 48517987Speter * should certainly be disallowed in the case of `if ;'. 48617987Speter */ 48717987Speter if (!redir) 48817987Speter synexpect(-1); 4891556Srgrimes case TNL: 49010399Sjoerg case TEOF: 4911556Srgrimes case TWORD: 49217987Speter case TRP: 4931556Srgrimes tokpushback++; 49475160Sbrian n1 = simplecmd(rpp, redir); 49575160Sbrian goto checkneg; 4961556Srgrimes default: 4971556Srgrimes synexpect(-1); 4981556Srgrimes } 4991556Srgrimes 5001556Srgrimes /* Now check for redirection which may follow command */ 5011556Srgrimes while (readtoken() == TREDIR) { 5021556Srgrimes *rpp = n2 = redirnode; 5031556Srgrimes rpp = &n2->nfile.next; 5041556Srgrimes parsefname(); 5051556Srgrimes } 5061556Srgrimes tokpushback++; 5071556Srgrimes *rpp = NULL; 5081556Srgrimes if (redir) { 5091556Srgrimes if (n1->type != NSUBSHELL) { 5101556Srgrimes n2 = (union node *)stalloc(sizeof (struct nredir)); 5111556Srgrimes n2->type = NREDIR; 5121556Srgrimes n2->nredir.n = n1; 5131556Srgrimes n1 = n2; 5141556Srgrimes } 5151556Srgrimes n1->nredir.redirect = redir; 5161556Srgrimes } 51775160Sbrian 51875160Sbriancheckneg: 51975160Sbrian if (negate) { 52075160Sbrian n2 = (union node *)stalloc(sizeof (struct nnot)); 52175160Sbrian n2->type = NNOT; 52275160Sbrian n2->nnot.com = n1; 52375160Sbrian return n2; 52475160Sbrian } 52575160Sbrian else 52675160Sbrian return n1; 5271556Srgrimes} 5281556Srgrimes 5291556Srgrimes 5301556SrgrimesSTATIC union node * 53190111Simpsimplecmd(union node **rpp, union node *redir) 53290111Simp{ 5331556Srgrimes union node *args, **app; 5341556Srgrimes union node **orig_rpp = rpp; 53575160Sbrian union node *n = NULL, *n2; 53675160Sbrian int negate = 0; 5371556Srgrimes 5381556Srgrimes /* If we don't have any redirections already, then we must reset */ 5391556Srgrimes /* rpp to be the address of the local redir variable. */ 5401556Srgrimes if (redir == 0) 5411556Srgrimes rpp = &redir; 5421556Srgrimes 5431556Srgrimes args = NULL; 5441556Srgrimes app = &args; 5458855Srgrimes /* 5461556Srgrimes * We save the incoming value, because we need this for shell 5471556Srgrimes * functions. There can not be a redirect or an argument between 5488855Srgrimes * the function name and the open parenthesis. 5491556Srgrimes */ 5501556Srgrimes orig_rpp = rpp; 5511556Srgrimes 55275160Sbrian while (readtoken() == TNOT) { 55375160Sbrian TRACE(("command: TNOT recognized\n")); 55475160Sbrian negate = !negate; 55575160Sbrian } 55675160Sbrian tokpushback++; 55775160Sbrian 5581556Srgrimes for (;;) { 5591556Srgrimes if (readtoken() == TWORD) { 5601556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 5611556Srgrimes n->type = NARG; 5621556Srgrimes n->narg.text = wordtext; 5631556Srgrimes n->narg.backquote = backquotelist; 5641556Srgrimes *app = n; 5651556Srgrimes app = &n->narg.next; 5661556Srgrimes } else if (lasttoken == TREDIR) { 5671556Srgrimes *rpp = n = redirnode; 5681556Srgrimes rpp = &n->nfile.next; 5691556Srgrimes parsefname(); /* read name of redirection file */ 5701556Srgrimes } else if (lasttoken == TLP && app == &args->narg.next 5711556Srgrimes && rpp == orig_rpp) { 5721556Srgrimes /* We have a function */ 5731556Srgrimes if (readtoken() != TRP) 5741556Srgrimes synexpect(TRP); 5751556Srgrimes#ifdef notdef 5761556Srgrimes if (! goodname(n->narg.text)) 5771556Srgrimes synerror("Bad function name"); 5781556Srgrimes#endif 5791556Srgrimes n->type = NDEFUN; 5801556Srgrimes n->narg.next = command(); 58175160Sbrian goto checkneg; 5821556Srgrimes } else { 5831556Srgrimes tokpushback++; 5841556Srgrimes break; 5851556Srgrimes } 5861556Srgrimes } 5871556Srgrimes *app = NULL; 5881556Srgrimes *rpp = NULL; 5891556Srgrimes n = (union node *)stalloc(sizeof (struct ncmd)); 5901556Srgrimes n->type = NCMD; 5911556Srgrimes n->ncmd.backgnd = 0; 5921556Srgrimes n->ncmd.args = args; 5931556Srgrimes n->ncmd.redirect = redir; 59475160Sbrian 59575160Sbriancheckneg: 59675160Sbrian if (negate) { 59775160Sbrian n2 = (union node *)stalloc(sizeof (struct nnot)); 59875160Sbrian n2->type = NNOT; 59975160Sbrian n2->nnot.com = n; 60075160Sbrian return n2; 60175160Sbrian } 60275160Sbrian else 60375160Sbrian return n; 6041556Srgrimes} 6051556Srgrimes 60617987SpeterSTATIC union node * 60790111Simpmakename(void) 60890111Simp{ 60917987Speter union node *n; 6101556Srgrimes 61117987Speter n = (union node *)stalloc(sizeof (struct narg)); 61217987Speter n->type = NARG; 61317987Speter n->narg.next = NULL; 61417987Speter n->narg.text = wordtext; 61517987Speter n->narg.backquote = backquotelist; 61617987Speter return n; 61717987Speter} 61817987Speter 61990111Simpvoid fixredir(union node *n, const char *text, int err) 62090111Simp{ 62117987Speter TRACE(("Fix redir %s %d\n", text, err)); 62217987Speter if (!err) 62317987Speter n->ndup.vname = NULL; 62417987Speter 62517987Speter if (is_digit(text[0]) && text[1] == '\0') 62617987Speter n->ndup.dupfd = digit_val(text[0]); 62717987Speter else if (text[0] == '-' && text[1] == '\0') 62817987Speter n->ndup.dupfd = -1; 62917987Speter else { 63020425Ssteve 63117987Speter if (err) 63217987Speter synerror("Bad fd number"); 63317987Speter else 63417987Speter n->ndup.vname = makename(); 63517987Speter } 63617987Speter} 63717987Speter 63817987Speter 6391556SrgrimesSTATIC void 64090111Simpparsefname(void) 64190111Simp{ 6421556Srgrimes union node *n = redirnode; 6431556Srgrimes 6441556Srgrimes if (readtoken() != TWORD) 6451556Srgrimes synexpect(-1); 6461556Srgrimes if (n->type == NHERE) { 6471556Srgrimes struct heredoc *here = heredoc; 6481556Srgrimes struct heredoc *p; 6491556Srgrimes int i; 6501556Srgrimes 6511556Srgrimes if (quoteflag == 0) 6521556Srgrimes n->type = NXHERE; 6531556Srgrimes TRACE(("Here document %d\n", n->type)); 6541556Srgrimes if (here->striptabs) { 6551556Srgrimes while (*wordtext == '\t') 6561556Srgrimes wordtext++; 6571556Srgrimes } 6581556Srgrimes if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 6591556Srgrimes synerror("Illegal eof marker for << redirection"); 6601556Srgrimes rmescapes(wordtext); 6611556Srgrimes here->eofmark = wordtext; 6621556Srgrimes here->next = NULL; 6631556Srgrimes if (heredoclist == NULL) 6641556Srgrimes heredoclist = here; 6651556Srgrimes else { 6661556Srgrimes for (p = heredoclist ; p->next ; p = p->next); 6671556Srgrimes p->next = here; 6681556Srgrimes } 6691556Srgrimes } else if (n->type == NTOFD || n->type == NFROMFD) { 67017987Speter fixredir(n, wordtext, 0); 6711556Srgrimes } else { 67217987Speter n->nfile.fname = makename(); 6731556Srgrimes } 6741556Srgrimes} 6751556Srgrimes 6761556Srgrimes 6771556Srgrimes/* 6781556Srgrimes * Input any here documents. 6791556Srgrimes */ 6801556Srgrimes 6811556SrgrimesSTATIC void 68290111Simpparseheredoc(void) 68390111Simp{ 6841556Srgrimes struct heredoc *here; 6851556Srgrimes union node *n; 6861556Srgrimes 6871556Srgrimes while (heredoclist) { 6881556Srgrimes here = heredoclist; 6891556Srgrimes heredoclist = here->next; 6901556Srgrimes if (needprompt) { 6911556Srgrimes setprompt(2); 6921556Srgrimes needprompt = 0; 6931556Srgrimes } 6941556Srgrimes readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 6951556Srgrimes here->eofmark, here->striptabs); 6961556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 6971556Srgrimes n->narg.type = NARG; 6981556Srgrimes n->narg.next = NULL; 6991556Srgrimes n->narg.text = wordtext; 7001556Srgrimes n->narg.backquote = backquotelist; 7011556Srgrimes here->here->nhere.doc = n; 7021556Srgrimes } 7031556Srgrimes} 7041556Srgrimes 7051556SrgrimesSTATIC int 70690111Simppeektoken(void) 70790111Simp{ 7081556Srgrimes int t; 7091556Srgrimes 7101556Srgrimes t = readtoken(); 7111556Srgrimes tokpushback++; 7121556Srgrimes return (t); 7131556Srgrimes} 7141556Srgrimes 7151556SrgrimesSTATIC int 71690111Simpreadtoken(void) 71790111Simp{ 7181556Srgrimes int t; 7191556Srgrimes int savecheckkwd = checkkwd; 7201556Srgrimes struct alias *ap; 7211556Srgrimes#ifdef DEBUG 7221556Srgrimes int alreadyseen = tokpushback; 7231556Srgrimes#endif 7248855Srgrimes 7251556Srgrimes top: 7261556Srgrimes t = xxreadtoken(); 7271556Srgrimes 7281556Srgrimes if (checkkwd) { 7291556Srgrimes /* 7301556Srgrimes * eat newlines 7311556Srgrimes */ 7321556Srgrimes if (checkkwd == 2) { 7331556Srgrimes checkkwd = 0; 7341556Srgrimes while (t == TNL) { 7351556Srgrimes parseheredoc(); 7361556Srgrimes t = xxreadtoken(); 7371556Srgrimes } 7381556Srgrimes } else 7391556Srgrimes checkkwd = 0; 7401556Srgrimes /* 7411556Srgrimes * check for keywords and aliases 7421556Srgrimes */ 74320425Ssteve if (t == TWORD && !quoteflag) 74417987Speter { 74598463Sjmallett const char * const *pp; 7461556Srgrimes 74798463Sjmallett for (pp = parsekwd; *pp; pp++) { 74820425Ssteve if (**pp == *wordtext && equal(*pp, wordtext)) 74917987Speter { 7501556Srgrimes lasttoken = t = pp - parsekwd + KWDOFFSET; 7511556Srgrimes TRACE(("keyword %s recognized\n", tokname[t])); 7521556Srgrimes goto out; 7531556Srgrimes } 7541556Srgrimes } 75518018Speter if (noaliases == 0 && 75618018Speter (ap = lookupalias(wordtext, 1)) != NULL) { 7571556Srgrimes pushstring(ap->val, strlen(ap->val), ap); 7581556Srgrimes checkkwd = savecheckkwd; 7591556Srgrimes goto top; 7601556Srgrimes } 7611556Srgrimes } 7621556Srgrimesout: 76375160Sbrian checkkwd = (t == TNOT) ? savecheckkwd : 0; 7641556Srgrimes } 7651556Srgrimes#ifdef DEBUG 7661556Srgrimes if (!alreadyseen) 7671556Srgrimes TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 7681556Srgrimes else 7691556Srgrimes TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 7701556Srgrimes#endif 7711556Srgrimes return (t); 7721556Srgrimes} 7731556Srgrimes 7741556Srgrimes 7751556Srgrimes/* 7761556Srgrimes * Read the next input token. 7771556Srgrimes * If the token is a word, we set backquotelist to the list of cmds in 7781556Srgrimes * backquotes. We set quoteflag to true if any part of the word was 7791556Srgrimes * quoted. 7801556Srgrimes * If the token is TREDIR, then we set redirnode to a structure containing 7811556Srgrimes * the redirection. 7821556Srgrimes * In all cases, the variable startlinno is set to the number of the line 7831556Srgrimes * on which the token starts. 7841556Srgrimes * 7851556Srgrimes * [Change comment: here documents and internal procedures] 7861556Srgrimes * [Readtoken shouldn't have any arguments. Perhaps we should make the 7871556Srgrimes * word parsing code into a separate routine. In this case, readtoken 7881556Srgrimes * doesn't need to have any internal procedures, but parseword does. 7891556Srgrimes * We could also make parseoperator in essence the main routine, and 7901556Srgrimes * have parseword (readtoken1?) handle both words and redirection.] 7911556Srgrimes */ 7921556Srgrimes 7931556Srgrimes#define RETURN(token) return lasttoken = token 7941556Srgrimes 7951556SrgrimesSTATIC int 79690111Simpxxreadtoken(void) 79790111Simp{ 79825230Ssteve int c; 7991556Srgrimes 8001556Srgrimes if (tokpushback) { 8011556Srgrimes tokpushback = 0; 8021556Srgrimes return lasttoken; 8031556Srgrimes } 8041556Srgrimes if (needprompt) { 8051556Srgrimes setprompt(2); 8061556Srgrimes needprompt = 0; 8071556Srgrimes } 8081556Srgrimes startlinno = plinno; 8091556Srgrimes for (;;) { /* until token or start of word found */ 8101556Srgrimes c = pgetc_macro(); 8111556Srgrimes if (c == ' ' || c == '\t') 8121556Srgrimes continue; /* quick check for white space first */ 8131556Srgrimes switch (c) { 8141556Srgrimes case ' ': case '\t': 8151556Srgrimes continue; 8161556Srgrimes case '#': 8171556Srgrimes while ((c = pgetc()) != '\n' && c != PEOF); 8181556Srgrimes pungetc(); 8191556Srgrimes continue; 8201556Srgrimes case '\\': 8211556Srgrimes if (pgetc() == '\n') { 8221556Srgrimes startlinno = ++plinno; 8231556Srgrimes if (doprompt) 8241556Srgrimes setprompt(2); 8251556Srgrimes else 8261556Srgrimes setprompt(0); 8271556Srgrimes continue; 8281556Srgrimes } 8291556Srgrimes pungetc(); 8301556Srgrimes goto breakloop; 8311556Srgrimes case '\n': 8321556Srgrimes plinno++; 8331556Srgrimes needprompt = doprompt; 8341556Srgrimes RETURN(TNL); 8351556Srgrimes case PEOF: 8361556Srgrimes RETURN(TEOF); 8371556Srgrimes case '&': 8381556Srgrimes if (pgetc() == '&') 8391556Srgrimes RETURN(TAND); 8401556Srgrimes pungetc(); 8411556Srgrimes RETURN(TBACKGND); 8421556Srgrimes case '|': 8431556Srgrimes if (pgetc() == '|') 8441556Srgrimes RETURN(TOR); 8451556Srgrimes pungetc(); 8461556Srgrimes RETURN(TPIPE); 8471556Srgrimes case ';': 8481556Srgrimes if (pgetc() == ';') 8491556Srgrimes RETURN(TENDCASE); 8501556Srgrimes pungetc(); 8511556Srgrimes RETURN(TSEMI); 8521556Srgrimes case '(': 8531556Srgrimes RETURN(TLP); 8541556Srgrimes case ')': 8551556Srgrimes RETURN(TRP); 8561556Srgrimes default: 8571556Srgrimes goto breakloop; 8581556Srgrimes } 8591556Srgrimes } 8601556Srgrimesbreakloop: 8611556Srgrimes return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 8621556Srgrimes#undef RETURN 8631556Srgrimes} 8641556Srgrimes 8651556Srgrimes 8661556Srgrimes 8671556Srgrimes/* 8681556Srgrimes * If eofmark is NULL, read a word or a redirection symbol. If eofmark 8691556Srgrimes * is not NULL, read a here document. In the latter case, eofmark is the 8701556Srgrimes * word which marks the end of the document and striptabs is true if 8711556Srgrimes * leading tabs should be stripped from the document. The argument firstc 8721556Srgrimes * is the first character of the input token or document. 8731556Srgrimes * 8741556Srgrimes * Because C does not have internal subroutines, I have simulated them 8751556Srgrimes * using goto's to implement the subroutine linkage. The following macros 8761556Srgrimes * will run code that appears at the end of readtoken1. 8771556Srgrimes */ 8781556Srgrimes 8791556Srgrimes#define CHECKEND() {goto checkend; checkend_return:;} 8801556Srgrimes#define PARSEREDIR() {goto parseredir; parseredir_return:;} 8811556Srgrimes#define PARSESUB() {goto parsesub; parsesub_return:;} 8821556Srgrimes#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} 8831556Srgrimes#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} 8841556Srgrimes#define PARSEARITH() {goto parsearith; parsearith_return:;} 8851556Srgrimes 8861556SrgrimesSTATIC int 88790111Simpreadtoken1(int firstc, char const *syntax, char *eofmark, int striptabs) 88890111Simp{ 88917987Speter int c = firstc; 89017987Speter char *out; 8911556Srgrimes int len; 8921556Srgrimes char line[EOFMARKLEN + 1]; 8931556Srgrimes struct nodelist *bqlist; 8941556Srgrimes int quotef; 8951556Srgrimes int dblquote; 8961556Srgrimes int varnest; /* levels of variables expansion */ 8971556Srgrimes int arinest; /* levels of arithmetic expansion */ 8981556Srgrimes int parenlevel; /* levels of parens in arithmetic */ 8991556Srgrimes int oldstyle; 9001556Srgrimes char const *prevsyntax; /* syntax before arithmetic */ 90154679Scracauer int synentry; 90217987Speter#if __GNUC__ 90317987Speter /* Avoid longjmp clobbering */ 90417987Speter (void) &out; 90517987Speter (void) "ef; 90617987Speter (void) &dblquote; 90717987Speter (void) &varnest; 90817987Speter (void) &arinest; 90917987Speter (void) &parenlevel; 91017987Speter (void) &oldstyle; 91117987Speter (void) &prevsyntax; 91217987Speter (void) &syntax; 91354679Scracauer (void) &synentry; 91417987Speter#endif 9151556Srgrimes 9161556Srgrimes startlinno = plinno; 9171556Srgrimes dblquote = 0; 9181556Srgrimes if (syntax == DQSYNTAX) 9191556Srgrimes dblquote = 1; 9201556Srgrimes quotef = 0; 9211556Srgrimes bqlist = NULL; 9221556Srgrimes varnest = 0; 9231556Srgrimes arinest = 0; 9241556Srgrimes parenlevel = 0; 9251556Srgrimes 9261556Srgrimes STARTSTACKSTR(out); 9271556Srgrimes loop: { /* for each line, until end of word */ 9281556Srgrimes#if ATTY 9291556Srgrimes if (c == '\034' && doprompt 9301556Srgrimes && attyset() && ! equal(termval(), "emacs")) { 9311556Srgrimes attyline(); 9321556Srgrimes if (syntax == BASESYNTAX) 9331556Srgrimes return readtoken(); 9341556Srgrimes c = pgetc(); 9351556Srgrimes goto loop; 9361556Srgrimes } 9371556Srgrimes#endif 9381556Srgrimes CHECKEND(); /* set c to PEOF if at end of here document */ 9391556Srgrimes for (;;) { /* until end of line or end of word */ 9401556Srgrimes CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ 94154679Scracauer 94264705Scracauer synentry = syntax[c]; 94354679Scracauer 94454679Scracauer switch(synentry) { 9451556Srgrimes case CNL: /* '\n' */ 9461556Srgrimes if (syntax == BASESYNTAX) 9471556Srgrimes goto endword; /* exit outer loop */ 9481556Srgrimes USTPUTC(c, out); 9491556Srgrimes plinno++; 9501556Srgrimes if (doprompt) 9511556Srgrimes setprompt(2); 9521556Srgrimes else 9531556Srgrimes setprompt(0); 9541556Srgrimes c = pgetc(); 9551556Srgrimes goto loop; /* continue outer loop */ 9561556Srgrimes case CWORD: 9571556Srgrimes USTPUTC(c, out); 9581556Srgrimes break; 9591556Srgrimes case CCTL: 9601556Srgrimes if (eofmark == NULL || dblquote) 9611556Srgrimes USTPUTC(CTLESC, out); 9621556Srgrimes USTPUTC(c, out); 9631556Srgrimes break; 9641556Srgrimes case CBACK: /* backslash */ 9651556Srgrimes c = pgetc(); 9661556Srgrimes if (c == PEOF) { 9671556Srgrimes USTPUTC('\\', out); 9681556Srgrimes pungetc(); 9691556Srgrimes } else if (c == '\n') { 9701556Srgrimes if (doprompt) 9711556Srgrimes setprompt(2); 9721556Srgrimes else 9731556Srgrimes setprompt(0); 9741556Srgrimes } else { 97554631Scracauer if (dblquote && c != '\\' && 97654631Scracauer c != '`' && c != '$' && 97754631Scracauer (c != '"' || eofmark != NULL)) 9781556Srgrimes USTPUTC('\\', out); 97983675Stegge if (SQSYNTAX[c] == CCTL) 9801556Srgrimes USTPUTC(CTLESC, out); 98139137Stegge else if (eofmark == NULL) 98238887Stegge USTPUTC(CTLQUOTEMARK, out); 9831556Srgrimes USTPUTC(c, out); 9841556Srgrimes quotef++; 9851556Srgrimes } 9861556Srgrimes break; 9871556Srgrimes case CSQUOTE: 98839137Stegge if (eofmark == NULL) 98939137Stegge USTPUTC(CTLQUOTEMARK, out); 9901556Srgrimes syntax = SQSYNTAX; 9911556Srgrimes break; 9921556Srgrimes case CDQUOTE: 99339137Stegge if (eofmark == NULL) 99439137Stegge USTPUTC(CTLQUOTEMARK, out); 9951556Srgrimes syntax = DQSYNTAX; 9961556Srgrimes dblquote = 1; 9971556Srgrimes break; 9981556Srgrimes case CENDQUOTE: 99939137Stegge if (eofmark != NULL && arinest == 0 && 100039137Stegge varnest == 0) { 10011556Srgrimes USTPUTC(c, out); 10021556Srgrimes } else { 100339137Stegge if (arinest) { 10041556Srgrimes syntax = ARISYNTAX; 100539137Stegge dblquote = 0; 100639137Stegge } else if (eofmark == NULL) { 10071556Srgrimes syntax = BASESYNTAX; 100839137Stegge dblquote = 0; 100939137Stegge } 10101556Srgrimes quotef++; 10111556Srgrimes } 10121556Srgrimes break; 10131556Srgrimes case CVAR: /* '$' */ 10141556Srgrimes PARSESUB(); /* parse substitution */ 10151556Srgrimes break; 10161556Srgrimes case CENDVAR: /* '}' */ 10171556Srgrimes if (varnest > 0) { 10181556Srgrimes varnest--; 10191556Srgrimes USTPUTC(CTLENDVAR, out); 10201556Srgrimes } else { 10211556Srgrimes USTPUTC(c, out); 10221556Srgrimes } 10231556Srgrimes break; 10241556Srgrimes case CLP: /* '(' in arithmetic */ 10251556Srgrimes parenlevel++; 10261556Srgrimes USTPUTC(c, out); 10271556Srgrimes break; 10281556Srgrimes case CRP: /* ')' in arithmetic */ 10291556Srgrimes if (parenlevel > 0) { 10301556Srgrimes USTPUTC(c, out); 10311556Srgrimes --parenlevel; 10321556Srgrimes } else { 10331556Srgrimes if (pgetc() == ')') { 10341556Srgrimes if (--arinest == 0) { 10351556Srgrimes USTPUTC(CTLENDARI, out); 10361556Srgrimes syntax = prevsyntax; 103739137Stegge if (syntax == DQSYNTAX) 103839137Stegge dblquote = 1; 103939137Stegge else 104039137Stegge dblquote = 0; 10411556Srgrimes } else 10421556Srgrimes USTPUTC(')', out); 10431556Srgrimes } else { 10448855Srgrimes /* 10451556Srgrimes * unbalanced parens 10461556Srgrimes * (don't 2nd guess - no error) 10471556Srgrimes */ 10481556Srgrimes pungetc(); 10491556Srgrimes USTPUTC(')', out); 10501556Srgrimes } 10511556Srgrimes } 10521556Srgrimes break; 10531556Srgrimes case CBQUOTE: /* '`' */ 10541556Srgrimes PARSEBACKQOLD(); 10551556Srgrimes break; 10561556Srgrimes case CEOF: 10571556Srgrimes goto endword; /* exit outer loop */ 10581556Srgrimes default: 10591556Srgrimes if (varnest == 0) 10601556Srgrimes goto endword; /* exit outer loop */ 10611556Srgrimes USTPUTC(c, out); 10621556Srgrimes } 10631556Srgrimes c = pgetc_macro(); 10641556Srgrimes } 10651556Srgrimes } 10661556Srgrimesendword: 10671556Srgrimes if (syntax == ARISYNTAX) 10681556Srgrimes synerror("Missing '))'"); 10691556Srgrimes if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL) 10701556Srgrimes synerror("Unterminated quoted string"); 10711556Srgrimes if (varnest != 0) { 10721556Srgrimes startlinno = plinno; 10731556Srgrimes synerror("Missing '}'"); 10741556Srgrimes } 10751556Srgrimes USTPUTC('\0', out); 10761556Srgrimes len = out - stackblock(); 10771556Srgrimes out = stackblock(); 10781556Srgrimes if (eofmark == NULL) { 10791556Srgrimes if ((c == '>' || c == '<') 10801556Srgrimes && quotef == 0 10811556Srgrimes && len <= 2 10821556Srgrimes && (*out == '\0' || is_digit(*out))) { 10831556Srgrimes PARSEREDIR(); 10841556Srgrimes return lasttoken = TREDIR; 10851556Srgrimes } else { 10861556Srgrimes pungetc(); 10871556Srgrimes } 10881556Srgrimes } 10891556Srgrimes quoteflag = quotef; 10901556Srgrimes backquotelist = bqlist; 10911556Srgrimes grabstackblock(len); 10921556Srgrimes wordtext = out; 10931556Srgrimes return lasttoken = TWORD; 10941556Srgrimes/* end of readtoken routine */ 10951556Srgrimes 10961556Srgrimes 10971556Srgrimes 10981556Srgrimes/* 10991556Srgrimes * Check to see whether we are at the end of the here document. When this 11001556Srgrimes * is called, c is set to the first character of the next input line. If 11011556Srgrimes * we are at the end of the here document, this routine sets the c to PEOF. 11021556Srgrimes */ 11031556Srgrimes 11041556Srgrimescheckend: { 11051556Srgrimes if (eofmark) { 11061556Srgrimes if (striptabs) { 11071556Srgrimes while (c == '\t') 11081556Srgrimes c = pgetc(); 11091556Srgrimes } 11101556Srgrimes if (c == *eofmark) { 11111556Srgrimes if (pfgets(line, sizeof line) != NULL) { 111225230Ssteve char *p, *q; 11131556Srgrimes 11141556Srgrimes p = line; 11151556Srgrimes for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 11161556Srgrimes if (*p == '\n' && *q == '\0') { 11171556Srgrimes c = PEOF; 11181556Srgrimes plinno++; 11191556Srgrimes needprompt = doprompt; 11201556Srgrimes } else { 11211556Srgrimes pushstring(line, strlen(line), NULL); 11221556Srgrimes } 11231556Srgrimes } 11241556Srgrimes } 11251556Srgrimes } 11261556Srgrimes goto checkend_return; 11271556Srgrimes} 11281556Srgrimes 11291556Srgrimes 11301556Srgrimes/* 11311556Srgrimes * Parse a redirection operator. The variable "out" points to a string 11321556Srgrimes * specifying the fd to be redirected. The variable "c" contains the 11331556Srgrimes * first character of the redirection operator. 11341556Srgrimes */ 11351556Srgrimes 11361556Srgrimesparseredir: { 11371556Srgrimes char fd = *out; 11381556Srgrimes union node *np; 11391556Srgrimes 11401556Srgrimes np = (union node *)stalloc(sizeof (struct nfile)); 11411556Srgrimes if (c == '>') { 11421556Srgrimes np->nfile.fd = 1; 11431556Srgrimes c = pgetc(); 11441556Srgrimes if (c == '>') 11451556Srgrimes np->type = NAPPEND; 11461556Srgrimes else if (c == '&') 11471556Srgrimes np->type = NTOFD; 114896922Stjr else if (c == '|') 114996922Stjr np->type = NCLOBBER; 11501556Srgrimes else { 11511556Srgrimes np->type = NTO; 11521556Srgrimes pungetc(); 11531556Srgrimes } 11541556Srgrimes } else { /* c == '<' */ 11551556Srgrimes np->nfile.fd = 0; 11561556Srgrimes c = pgetc(); 11571556Srgrimes if (c == '<') { 11581556Srgrimes if (sizeof (struct nfile) != sizeof (struct nhere)) { 11591556Srgrimes np = (union node *)stalloc(sizeof (struct nhere)); 11601556Srgrimes np->nfile.fd = 0; 11611556Srgrimes } 11621556Srgrimes np->type = NHERE; 11631556Srgrimes heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 11641556Srgrimes heredoc->here = np; 11651556Srgrimes if ((c = pgetc()) == '-') { 11661556Srgrimes heredoc->striptabs = 1; 11671556Srgrimes } else { 11681556Srgrimes heredoc->striptabs = 0; 11691556Srgrimes pungetc(); 11701556Srgrimes } 11711556Srgrimes } else if (c == '&') 11721556Srgrimes np->type = NFROMFD; 117366612Sbrian else if (c == '>') 117466612Sbrian np->type = NFROMTO; 11751556Srgrimes else { 11761556Srgrimes np->type = NFROM; 11771556Srgrimes pungetc(); 11781556Srgrimes } 11791556Srgrimes } 11801556Srgrimes if (fd != '\0') 11811556Srgrimes np->nfile.fd = digit_val(fd); 11821556Srgrimes redirnode = np; 11831556Srgrimes goto parseredir_return; 11841556Srgrimes} 11851556Srgrimes 11861556Srgrimes 11871556Srgrimes/* 11881556Srgrimes * Parse a substitution. At this point, we have read the dollar sign 11891556Srgrimes * and nothing else. 11901556Srgrimes */ 11911556Srgrimes 11921556Srgrimesparsesub: { 11931556Srgrimes int subtype; 11941556Srgrimes int typeloc; 11951556Srgrimes int flags; 11961556Srgrimes char *p; 11971556Srgrimes#ifndef GDB_HACK 11981556Srgrimes static const char types[] = "}-+?="; 11991556Srgrimes#endif 120018202Speter int bracketed_name = 0; /* used to handle ${[0-9]*} variables */ 12011556Srgrimes 12021556Srgrimes c = pgetc(); 12031556Srgrimes if (c != '(' && c != '{' && !is_name(c) && !is_special(c)) { 12041556Srgrimes USTPUTC('$', out); 12051556Srgrimes pungetc(); 12061556Srgrimes } else if (c == '(') { /* $(command) or $((arith)) */ 12071556Srgrimes if (pgetc() == '(') { 12081556Srgrimes PARSEARITH(); 12091556Srgrimes } else { 12101556Srgrimes pungetc(); 12111556Srgrimes PARSEBACKQNEW(); 12121556Srgrimes } 12131556Srgrimes } else { 12141556Srgrimes USTPUTC(CTLVAR, out); 12151556Srgrimes typeloc = out - stackblock(); 12161556Srgrimes USTPUTC(VSNORMAL, out); 12171556Srgrimes subtype = VSNORMAL; 12181556Srgrimes if (c == '{') { 121918202Speter bracketed_name = 1; 12201556Srgrimes c = pgetc(); 122117987Speter if (c == '#') { 122217987Speter if ((c = pgetc()) == '}') 122317987Speter c = '#'; 122417987Speter else 122517987Speter subtype = VSLENGTH; 122617987Speter } 122717987Speter else 122817987Speter subtype = 0; 12291556Srgrimes } 12301556Srgrimes if (is_name(c)) { 12311556Srgrimes do { 12321556Srgrimes STPUTC(c, out); 12331556Srgrimes c = pgetc(); 12341556Srgrimes } while (is_in_name(c)); 123518202Speter } else if (is_digit(c)) { 123618202Speter if (bracketed_name) { 123718202Speter do { 123818202Speter STPUTC(c, out); 123918202Speter c = pgetc(); 124018202Speter } while (is_digit(c)); 124118202Speter } else { 124218202Speter STPUTC(c, out); 124318202Speter c = pgetc(); 124418202Speter } 12451556Srgrimes } else { 12461556Srgrimes if (! is_special(c)) 12471556Srgrimesbadsub: synerror("Bad substitution"); 12481556Srgrimes USTPUTC(c, out); 12491556Srgrimes c = pgetc(); 12501556Srgrimes } 12511556Srgrimes STPUTC('=', out); 12521556Srgrimes flags = 0; 12531556Srgrimes if (subtype == 0) { 125417987Speter switch (c) { 125517987Speter case ':': 12561556Srgrimes flags = VSNUL; 12571556Srgrimes c = pgetc(); 125817987Speter /*FALLTHROUGH*/ 125917987Speter default: 126017987Speter p = strchr(types, c); 126117987Speter if (p == NULL) 126217987Speter goto badsub; 126317987Speter subtype = p - types + VSNORMAL; 126417987Speter break; 126517987Speter case '%': 126620425Ssteve case '#': 126717987Speter { 126817987Speter int cc = c; 126917987Speter subtype = c == '#' ? VSTRIMLEFT : 127017987Speter VSTRIMRIGHT; 127117987Speter c = pgetc(); 127217987Speter if (c == cc) 127317987Speter subtype++; 127417987Speter else 127517987Speter pungetc(); 127617987Speter break; 127717987Speter } 12781556Srgrimes } 12791556Srgrimes } else { 12801556Srgrimes pungetc(); 12811556Srgrimes } 128257225Scracauer if (subtype != VSLENGTH && (dblquote || arinest)) 12831556Srgrimes flags |= VSQUOTE; 12841556Srgrimes *(stackblock() + typeloc) = subtype | flags; 12851556Srgrimes if (subtype != VSNORMAL) 12861556Srgrimes varnest++; 12871556Srgrimes } 12881556Srgrimes goto parsesub_return; 12891556Srgrimes} 12901556Srgrimes 12911556Srgrimes 12921556Srgrimes/* 12931556Srgrimes * Called to parse command substitutions. Newstyle is set if the command 12941556Srgrimes * is enclosed inside $(...); nlpp is a pointer to the head of the linked 12951556Srgrimes * list of commands (passed by reference), and savelen is the number of 12961556Srgrimes * characters on the top of the stack which must be preserved. 12971556Srgrimes */ 12981556Srgrimes 12991556Srgrimesparsebackq: { 13001556Srgrimes struct nodelist **nlpp; 13011556Srgrimes int savepbq; 13021556Srgrimes union node *n; 13031556Srgrimes char *volatile str; 13041556Srgrimes struct jmploc jmploc; 13051556Srgrimes struct jmploc *volatile savehandler; 13061556Srgrimes int savelen; 130720425Ssteve int saveprompt; 130820425Ssteve#if __GNUC__ 130920425Ssteve /* Avoid longjmp clobbering */ 131020425Ssteve (void) &saveprompt; 131120425Ssteve#endif 13121556Srgrimes 13131556Srgrimes savepbq = parsebackquote; 13141556Srgrimes if (setjmp(jmploc.loc)) { 13151556Srgrimes if (str) 13161556Srgrimes ckfree(str); 13171556Srgrimes parsebackquote = 0; 13181556Srgrimes handler = savehandler; 13191556Srgrimes longjmp(handler->loc, 1); 13201556Srgrimes } 13211556Srgrimes INTOFF; 13221556Srgrimes str = NULL; 13231556Srgrimes savelen = out - stackblock(); 13241556Srgrimes if (savelen > 0) { 13251556Srgrimes str = ckmalloc(savelen); 132617987Speter memcpy(str, stackblock(), savelen); 13271556Srgrimes } 13281556Srgrimes savehandler = handler; 13291556Srgrimes handler = &jmploc; 13301556Srgrimes INTON; 13311556Srgrimes if (oldstyle) { 13321556Srgrimes /* We must read until the closing backquote, giving special 13331556Srgrimes treatment to some slashes, and then push the string and 13341556Srgrimes reread it as input, interpreting it normally. */ 133525230Ssteve char *out; 133625230Ssteve int c; 13371556Srgrimes int savelen; 13381556Srgrimes char *str; 13398855Srgrimes 134020425Ssteve 13411556Srgrimes STARTSTACKSTR(out); 134220425Ssteve for (;;) { 134320425Ssteve if (needprompt) { 134420425Ssteve setprompt(2); 134520425Ssteve needprompt = 0; 134620425Ssteve } 134720425Ssteve switch (c = pgetc()) { 134820425Ssteve case '`': 134920425Ssteve goto done; 135020425Ssteve 135120425Ssteve case '\\': 135220425Ssteve if ((c = pgetc()) == '\n') { 135320425Ssteve plinno++; 135420425Ssteve if (doprompt) 135520425Ssteve setprompt(2); 135620425Ssteve else 135720425Ssteve setprompt(0); 135820425Ssteve /* 135920425Ssteve * If eating a newline, avoid putting 136020425Ssteve * the newline into the new character 136120425Ssteve * stream (via the STPUTC after the 136220425Ssteve * switch). 136320425Ssteve */ 136420425Ssteve continue; 136520425Ssteve } 136617987Speter if (c != '\\' && c != '`' && c != '$' 13671556Srgrimes && (!dblquote || c != '"')) 13681556Srgrimes STPUTC('\\', out); 136920425Ssteve break; 137020425Ssteve 137120425Ssteve case '\n': 137220425Ssteve plinno++; 137320425Ssteve needprompt = doprompt; 137420425Ssteve break; 137520425Ssteve 137620425Ssteve case PEOF: 137720425Ssteve startlinno = plinno; 137820425Ssteve synerror("EOF in backquote substitution"); 137920425Ssteve break; 138020425Ssteve 138120425Ssteve default: 138220425Ssteve break; 138320425Ssteve } 138420425Ssteve STPUTC(c, out); 13851556Srgrimes } 138620425Sstevedone: 13871556Srgrimes STPUTC('\0', out); 13881556Srgrimes savelen = out - stackblock(); 13891556Srgrimes if (savelen > 0) { 13901556Srgrimes str = ckmalloc(savelen); 139117987Speter memcpy(str, stackblock(), savelen); 139217987Speter setinputstring(str, 1); 13931556Srgrimes } 13941556Srgrimes } 13951556Srgrimes nlpp = &bqlist; 13961556Srgrimes while (*nlpp) 13971556Srgrimes nlpp = &(*nlpp)->next; 13981556Srgrimes *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 13991556Srgrimes (*nlpp)->next = NULL; 14001556Srgrimes parsebackquote = oldstyle; 140120425Ssteve 140220425Ssteve if (oldstyle) { 140320425Ssteve saveprompt = doprompt; 140420425Ssteve doprompt = 0; 140520425Ssteve } 140620425Ssteve 14071556Srgrimes n = list(0); 140820425Ssteve 140920425Ssteve if (oldstyle) 141020425Ssteve doprompt = saveprompt; 141120425Ssteve else { 141220425Ssteve if (readtoken() != TRP) 141320425Ssteve synexpect(TRP); 141420425Ssteve } 141520425Ssteve 14161556Srgrimes (*nlpp)->n = n; 141720425Ssteve if (oldstyle) { 141820425Ssteve /* 141920425Ssteve * Start reading from old file again, ignoring any pushed back 142020425Ssteve * tokens left from the backquote parsing 142120425Ssteve */ 14221556Srgrimes popfile(); 142320425Ssteve tokpushback = 0; 142420425Ssteve } 14251556Srgrimes while (stackblocksize() <= savelen) 14261556Srgrimes growstackblock(); 14271556Srgrimes STARTSTACKSTR(out); 14281556Srgrimes if (str) { 142917987Speter memcpy(out, str, savelen); 14301556Srgrimes STADJUST(savelen, out); 14311556Srgrimes INTOFF; 14321556Srgrimes ckfree(str); 14331556Srgrimes str = NULL; 14341556Srgrimes INTON; 14351556Srgrimes } 14361556Srgrimes parsebackquote = savepbq; 14371556Srgrimes handler = savehandler; 14381556Srgrimes if (arinest || dblquote) 14391556Srgrimes USTPUTC(CTLBACKQ | CTLQUOTE, out); 14401556Srgrimes else 14411556Srgrimes USTPUTC(CTLBACKQ, out); 14421556Srgrimes if (oldstyle) 14431556Srgrimes goto parsebackq_oldreturn; 14441556Srgrimes else 14451556Srgrimes goto parsebackq_newreturn; 14461556Srgrimes} 14471556Srgrimes 14481556Srgrimes/* 14491556Srgrimes * Parse an arithmetic expansion (indicate start of one and set state) 14501556Srgrimes */ 14511556Srgrimesparsearith: { 14521556Srgrimes 14531556Srgrimes if (++arinest == 1) { 14541556Srgrimes prevsyntax = syntax; 14551556Srgrimes syntax = ARISYNTAX; 14561556Srgrimes USTPUTC(CTLARI, out); 145738887Stegge if (dblquote) 145838887Stegge USTPUTC('"',out); 145938887Stegge else 146038887Stegge USTPUTC(' ',out); 14611556Srgrimes } else { 14621556Srgrimes /* 14631556Srgrimes * we collapse embedded arithmetic expansion to 14641556Srgrimes * parenthesis, which should be equivalent 14651556Srgrimes */ 14661556Srgrimes USTPUTC('(', out); 14671556Srgrimes } 14681556Srgrimes goto parsearith_return; 14691556Srgrimes} 14701556Srgrimes 14711556Srgrimes} /* end of readtoken */ 14721556Srgrimes 14731556Srgrimes 14741556Srgrimes 14751556Srgrimes#ifdef mkinit 14761556SrgrimesRESET { 14771556Srgrimes tokpushback = 0; 14781556Srgrimes checkkwd = 0; 14791556Srgrimes} 14801556Srgrimes#endif 14811556Srgrimes 14821556Srgrimes/* 14831556Srgrimes * Returns true if the text contains nothing to expand (no dollar signs 14841556Srgrimes * or backquotes). 14851556Srgrimes */ 14861556Srgrimes 14871556SrgrimesSTATIC int 148890111Simpnoexpand(char *text) 148990111Simp{ 149025230Ssteve char *p; 149125230Ssteve char c; 14921556Srgrimes 14931556Srgrimes p = text; 14941556Srgrimes while ((c = *p++) != '\0') { 149539137Stegge if ( c == CTLQUOTEMARK) 149639137Stegge continue; 14971556Srgrimes if (c == CTLESC) 14981556Srgrimes p++; 149983675Stegge else if (BASESYNTAX[(int)c] == CCTL) 15001556Srgrimes return 0; 15011556Srgrimes } 15021556Srgrimes return 1; 15031556Srgrimes} 15041556Srgrimes 15051556Srgrimes 15061556Srgrimes/* 15071556Srgrimes * Return true if the argument is a legal variable name (a letter or 15081556Srgrimes * underscore followed by zero or more letters, underscores, and digits). 15091556Srgrimes */ 15101556Srgrimes 15111556Srgrimesint 151290111Simpgoodname(char *name) 151390111Simp{ 151425230Ssteve char *p; 15151556Srgrimes 15161556Srgrimes p = name; 15171556Srgrimes if (! is_name(*p)) 15181556Srgrimes return 0; 15191556Srgrimes while (*++p) { 15201556Srgrimes if (! is_in_name(*p)) 15211556Srgrimes return 0; 15221556Srgrimes } 15231556Srgrimes return 1; 15241556Srgrimes} 15251556Srgrimes 15261556Srgrimes 15271556Srgrimes/* 15281556Srgrimes * Called when an unexpected token is read during the parse. The argument 15291556Srgrimes * is the token that is expected, or -1 if more than one type of token can 15301556Srgrimes * occur at this point. 15311556Srgrimes */ 15321556Srgrimes 15331556SrgrimesSTATIC void 153490111Simpsynexpect(int token) 153517987Speter{ 15361556Srgrimes char msg[64]; 15371556Srgrimes 15381556Srgrimes if (token >= 0) { 15391556Srgrimes fmtstr(msg, 64, "%s unexpected (expecting %s)", 15401556Srgrimes tokname[lasttoken], tokname[token]); 15411556Srgrimes } else { 15421556Srgrimes fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 15431556Srgrimes } 15441556Srgrimes synerror(msg); 15451556Srgrimes} 15461556Srgrimes 15471556Srgrimes 15481556SrgrimesSTATIC void 154990111Simpsynerror(char *msg) 155090111Simp{ 15511556Srgrimes if (commandname) 15521556Srgrimes outfmt(&errout, "%s: %d: ", commandname, startlinno); 15531556Srgrimes outfmt(&errout, "Syntax error: %s\n", msg); 15541556Srgrimes error((char *)NULL); 15551556Srgrimes} 15561556Srgrimes 15571556SrgrimesSTATIC void 155890111Simpsetprompt(int which) 155990111Simp{ 15601556Srgrimes whichprompt = which; 15611556Srgrimes 156217987Speter#ifndef NO_HISTORY 15631556Srgrimes if (!el) 156417987Speter#endif 15651556Srgrimes out2str(getprompt(NULL)); 15661556Srgrimes} 15671556Srgrimes 15681556Srgrimes/* 15691556Srgrimes * called by editline -- any expansions to the prompt 15701556Srgrimes * should be added here. 15711556Srgrimes */ 15721556Srgrimeschar * 157390111Simpgetprompt(void *unused __unused) 157425905Ssteve{ 15751556Srgrimes switch (whichprompt) { 15761556Srgrimes case 0: 15771556Srgrimes return ""; 15781556Srgrimes case 1: 15791556Srgrimes return ps1val(); 15801556Srgrimes case 2: 15811556Srgrimes return ps2val(); 15821556Srgrimes default: 15831556Srgrimes return "<internal prompt error>"; 15841556Srgrimes } 15851556Srgrimes} 1586