parser.c revision 8855
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. 353044Sdg * 368855Srgrimes * $Id: parser.c,v 1.5 1995/01/11 07:07:00 paul Exp $ 371556Srgrimes */ 381556Srgrimes 391556Srgrimes#ifndef lint 401556Srgrimesstatic char sccsid[] = "@(#)parser.c 8.1 (Berkeley) 5/31/93"; 411556Srgrimes#endif /* not lint */ 421556Srgrimes 431556Srgrimes#include "shell.h" 441556Srgrimes#include "parser.h" 451556Srgrimes#include "nodes.h" 461556Srgrimes#include "expand.h" /* defines rmescapes() */ 471556Srgrimes#include "redir.h" /* defines copyfd() */ 481556Srgrimes#include "syntax.h" 491556Srgrimes#include "options.h" 501556Srgrimes#include "input.h" 511556Srgrimes#include "output.h" 521556Srgrimes#include "var.h" 531556Srgrimes#include "error.h" 541556Srgrimes#include "memalloc.h" 551556Srgrimes#include "mystring.h" 561556Srgrimes#include "alias.h" 571556Srgrimes#include "myhistedit.h" 581556Srgrimes 591556Srgrimes 601556Srgrimes/* 611556Srgrimes * Shell command parser. 621556Srgrimes */ 631556Srgrimes 641556Srgrimes#define EOFMARKLEN 79 651556Srgrimes 661556Srgrimes/* values returned by readtoken */ 671556Srgrimes#include "token.def" 681556Srgrimes 691556Srgrimes 701556Srgrimes 711556Srgrimesstruct heredoc { 721556Srgrimes struct heredoc *next; /* next here document in list */ 731556Srgrimes union node *here; /* redirection node */ 741556Srgrimes char *eofmark; /* string indicating end of input */ 751556Srgrimes int striptabs; /* if set, strip leading tabs */ 761556Srgrimes}; 771556Srgrimes 781556Srgrimes 791556Srgrimes 801556Srgrimesstruct heredoc *heredoclist; /* list of here documents to read */ 811556Srgrimesint parsebackquote; /* nonzero if we are inside backquotes */ 821556Srgrimesint doprompt; /* if set, prompt the user */ 831556Srgrimesint needprompt; /* true if interactive and at start of line */ 841556Srgrimesint lasttoken; /* last token read */ 851556SrgrimesMKINIT int tokpushback; /* last token pushed back */ 861556Srgrimeschar *wordtext; /* text of last word returned by readtoken */ 871556SrgrimesMKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ 881556Srgrimesstruct nodelist *backquotelist; 891556Srgrimesunion node *redirnode; 901556Srgrimesstruct heredoc *heredoc; 911556Srgrimesint quoteflag; /* set if (part of) last token was quoted */ 921556Srgrimesint startlinno; /* line # where last token started */ 931556Srgrimes 941556Srgrimes 951556Srgrimes#define GDB_HACK 1 /* avoid local declarations which gdb can't handle */ 961556Srgrimes#ifdef GDB_HACK 971556Srgrimesstatic const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'}; 981556Srgrimesstatic const char types[] = "}-+?="; 991556Srgrimes#endif 1001556Srgrimes 1011556Srgrimes 1021556SrgrimesSTATIC union node *list __P((int)); 1031556SrgrimesSTATIC union node *andor __P((void)); 1041556SrgrimesSTATIC union node *pipeline __P((void)); 1051556SrgrimesSTATIC union node *command __P((void)); 1061556SrgrimesSTATIC union node *simplecmd __P((union node **, union node *)); 1071556SrgrimesSTATIC void parsefname __P((void)); 1081556SrgrimesSTATIC void parseheredoc __P((void)); 1091556SrgrimesSTATIC int readtoken __P((void)); 1101556SrgrimesSTATIC int readtoken1 __P((int, char const *, char *, int)); 1111556SrgrimesSTATIC void attyline __P((void)); 1121556SrgrimesSTATIC int noexpand __P((char *)); 1131556SrgrimesSTATIC void synexpect __P((int)); 1141556SrgrimesSTATIC void synerror __P((char *)); 1151556SrgrimesSTATIC void setprompt __P((int)); 1161556Srgrimes 1171556Srgrimes/* 1181556Srgrimes * Read and parse a command. Returns NEOF on end of file. (NULL is a 1191556Srgrimes * valid parse tree indicating a blank line.) 1201556Srgrimes */ 1211556Srgrimes 1221556Srgrimesunion node * 1231556Srgrimesparsecmd(interact) { 1241556Srgrimes int t; 1251556Srgrimes 1261556Srgrimes doprompt = interact; 1271556Srgrimes if (doprompt) 1281556Srgrimes setprompt(1); 1291556Srgrimes else 1301556Srgrimes setprompt(0); 1311556Srgrimes needprompt = 0; 1321556Srgrimes t = readtoken(); 1331556Srgrimes if (t == TEOF) 1341556Srgrimes return NEOF; 1351556Srgrimes if (t == TNL) 1361556Srgrimes return NULL; 1371556Srgrimes tokpushback++; 1381556Srgrimes return list(1); 1391556Srgrimes} 1401556Srgrimes 1411556Srgrimes 1421556SrgrimesSTATIC union node * 1431556Srgrimeslist(nlflag) { 1441556Srgrimes union node *n1, *n2, *n3; 1451556Srgrimes 1461556Srgrimes checkkwd = 2; 1471556Srgrimes if (nlflag == 0 && tokendlist[peektoken()]) 1481556Srgrimes return NULL; 1491556Srgrimes n1 = andor(); 1501556Srgrimes for (;;) { 1511556Srgrimes switch (readtoken()) { 1521556Srgrimes case TBACKGND: 1531556Srgrimes if (n1->type == NCMD || n1->type == NPIPE) { 1541556Srgrimes n1->ncmd.backgnd = 1; 1551556Srgrimes } else if (n1->type == NREDIR) { 1561556Srgrimes n1->type = NBACKGND; 1571556Srgrimes } else { 1581556Srgrimes n3 = (union node *)stalloc(sizeof (struct nredir)); 1591556Srgrimes n3->type = NBACKGND; 1601556Srgrimes n3->nredir.n = n1; 1611556Srgrimes n3->nredir.redirect = NULL; 1621556Srgrimes n1 = n3; 1631556Srgrimes } 1641556Srgrimes goto tsemi; 1651556Srgrimes case TNL: 1661556Srgrimes tokpushback++; 1671556Srgrimes /* fall through */ 1681556Srgrimestsemi: case TSEMI: 1691556Srgrimes if (readtoken() == TNL) { 1701556Srgrimes parseheredoc(); 1711556Srgrimes if (nlflag) 1721556Srgrimes return n1; 1731556Srgrimes } else { 1741556Srgrimes tokpushback++; 1751556Srgrimes } 1761556Srgrimes checkkwd = 2; 1771556Srgrimes if (tokendlist[peektoken()]) 1781556Srgrimes return n1; 1791556Srgrimes n2 = andor(); 1801556Srgrimes n3 = (union node *)stalloc(sizeof (struct nbinary)); 1811556Srgrimes n3->type = NSEMI; 1821556Srgrimes n3->nbinary.ch1 = n1; 1831556Srgrimes n3->nbinary.ch2 = n2; 1841556Srgrimes n1 = n3; 1851556Srgrimes break; 1861556Srgrimes case TEOF: 1871556Srgrimes if (heredoclist) 1881556Srgrimes parseheredoc(); 1891556Srgrimes else 1901556Srgrimes pungetc(); /* push back EOF on input */ 1911556Srgrimes return n1; 1921556Srgrimes default: 1931556Srgrimes if (nlflag) 1941556Srgrimes synexpect(-1); 1951556Srgrimes tokpushback++; 1961556Srgrimes return n1; 1971556Srgrimes } 1981556Srgrimes } 1991556Srgrimes} 2001556Srgrimes 2011556Srgrimes 2021556Srgrimes 2031556SrgrimesSTATIC union node * 2041556Srgrimesandor() { 2051556Srgrimes union node *n1, *n2, *n3; 2061556Srgrimes int t; 2071556Srgrimes 2081556Srgrimes n1 = pipeline(); 2091556Srgrimes for (;;) { 2101556Srgrimes if ((t = readtoken()) == TAND) { 2111556Srgrimes t = NAND; 2121556Srgrimes } else if (t == TOR) { 2131556Srgrimes t = NOR; 2141556Srgrimes } else { 2151556Srgrimes tokpushback++; 2161556Srgrimes return n1; 2171556Srgrimes } 2181556Srgrimes n2 = pipeline(); 2191556Srgrimes n3 = (union node *)stalloc(sizeof (struct nbinary)); 2201556Srgrimes n3->type = t; 2211556Srgrimes n3->nbinary.ch1 = n1; 2221556Srgrimes n3->nbinary.ch2 = n2; 2231556Srgrimes n1 = n3; 2241556Srgrimes } 2251556Srgrimes} 2261556Srgrimes 2271556Srgrimes 2281556Srgrimes 2291556SrgrimesSTATIC union node * 2301556Srgrimespipeline() { 2311556Srgrimes union node *n1, *pipenode, *notnode; 2321556Srgrimes struct nodelist *lp, *prev; 2331556Srgrimes int negate = 0; 2341556Srgrimes 2351556Srgrimes TRACE(("pipeline: entered\n")); 2361556Srgrimes while (readtoken() == TNOT) { 2371556Srgrimes TRACE(("pipeline: TNOT recognized\n")); 2381556Srgrimes negate = !negate; 2391556Srgrimes } 2401556Srgrimes tokpushback++; 2411556Srgrimes n1 = command(); 2421556Srgrimes if (readtoken() == TPIPE) { 2431556Srgrimes pipenode = (union node *)stalloc(sizeof (struct npipe)); 2441556Srgrimes pipenode->type = NPIPE; 2451556Srgrimes pipenode->npipe.backgnd = 0; 2461556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 2471556Srgrimes pipenode->npipe.cmdlist = lp; 2481556Srgrimes lp->n = n1; 2491556Srgrimes do { 2501556Srgrimes prev = lp; 2511556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 2521556Srgrimes lp->n = command(); 2531556Srgrimes prev->next = lp; 2541556Srgrimes } while (readtoken() == TPIPE); 2551556Srgrimes lp->next = NULL; 2561556Srgrimes n1 = pipenode; 2571556Srgrimes } 2581556Srgrimes tokpushback++; 2591556Srgrimes if (negate) { 2601556Srgrimes notnode = (union node *)stalloc(sizeof (struct nnot)); 2611556Srgrimes notnode->type = NNOT; 2621556Srgrimes notnode->nnot.com = n1; 2631556Srgrimes n1 = notnode; 2641556Srgrimes } 2651556Srgrimes return n1; 2661556Srgrimes} 2671556Srgrimes 2681556Srgrimes 2691556Srgrimes 2701556SrgrimesSTATIC union node * 2711556Srgrimescommand() { 2721556Srgrimes union node *n1, *n2; 2731556Srgrimes union node *ap, **app; 2741556Srgrimes union node *cp, **cpp; 2751556Srgrimes union node *redir, **rpp; 2761556Srgrimes int t; 2771556Srgrimes 2781556Srgrimes checkkwd = 2; 2791556Srgrimes redir = 0; 2801556Srgrimes rpp = &redir; 2811556Srgrimes /* Check for redirection which may precede command */ 2821556Srgrimes while (readtoken() == TREDIR) { 2831556Srgrimes *rpp = n2 = redirnode; 2841556Srgrimes rpp = &n2->nfile.next; 2851556Srgrimes parsefname(); 2861556Srgrimes } 2871556Srgrimes tokpushback++; 2881556Srgrimes 2891556Srgrimes switch (readtoken()) { 2901556Srgrimes case TIF: 2911556Srgrimes n1 = (union node *)stalloc(sizeof (struct nif)); 2921556Srgrimes n1->type = NIF; 2931556Srgrimes n1->nif.test = list(0); 2941556Srgrimes if (readtoken() != TTHEN) 2951556Srgrimes synexpect(TTHEN); 2961556Srgrimes n1->nif.ifpart = list(0); 2971556Srgrimes n2 = n1; 2981556Srgrimes while (readtoken() == TELIF) { 2991556Srgrimes n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 3001556Srgrimes n2 = n2->nif.elsepart; 3011556Srgrimes n2->type = NIF; 3021556Srgrimes n2->nif.test = list(0); 3031556Srgrimes if (readtoken() != TTHEN) 3041556Srgrimes synexpect(TTHEN); 3051556Srgrimes n2->nif.ifpart = list(0); 3061556Srgrimes } 3071556Srgrimes if (lasttoken == TELSE) 3081556Srgrimes n2->nif.elsepart = list(0); 3091556Srgrimes else { 3101556Srgrimes n2->nif.elsepart = NULL; 3111556Srgrimes tokpushback++; 3121556Srgrimes } 3131556Srgrimes if (readtoken() != TFI) 3141556Srgrimes synexpect(TFI); 3151556Srgrimes checkkwd = 1; 3161556Srgrimes break; 3171556Srgrimes case TWHILE: 3181556Srgrimes case TUNTIL: { 3191556Srgrimes int got; 3201556Srgrimes n1 = (union node *)stalloc(sizeof (struct nbinary)); 3211556Srgrimes n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 3221556Srgrimes n1->nbinary.ch1 = list(0); 3231556Srgrimes if ((got=readtoken()) != TDO) { 3241556SrgrimesTRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 3251556Srgrimes synexpect(TDO); 3261556Srgrimes } 3271556Srgrimes n1->nbinary.ch2 = list(0); 3281556Srgrimes if (readtoken() != TDONE) 3291556Srgrimes synexpect(TDONE); 3301556Srgrimes checkkwd = 1; 3311556Srgrimes break; 3321556Srgrimes } 3331556Srgrimes case TFOR: 3341556Srgrimes if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 3351556Srgrimes synerror("Bad for loop variable"); 3361556Srgrimes n1 = (union node *)stalloc(sizeof (struct nfor)); 3371556Srgrimes n1->type = NFOR; 3381556Srgrimes n1->nfor.var = wordtext; 3391556Srgrimes if (readtoken() == TWORD && ! quoteflag && equal(wordtext, "in")) { 3401556Srgrimes app = ≈ 3411556Srgrimes while (readtoken() == TWORD) { 3421556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 3431556Srgrimes n2->type = NARG; 3441556Srgrimes n2->narg.text = wordtext; 3451556Srgrimes n2->narg.backquote = backquotelist; 3461556Srgrimes *app = n2; 3471556Srgrimes app = &n2->narg.next; 3481556Srgrimes } 3491556Srgrimes *app = NULL; 3501556Srgrimes n1->nfor.args = ap; 3511556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 3521556Srgrimes synexpect(-1); 3531556Srgrimes } else { 3541556Srgrimes#ifndef GDB_HACK 3551556Srgrimes static const char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, 3561556Srgrimes '@', '=', '\0'}; 3571556Srgrimes#endif 3581556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 3591556Srgrimes n2->type = NARG; 3601556Srgrimes n2->narg.text = (char *)argvars; 3611556Srgrimes n2->narg.backquote = NULL; 3621556Srgrimes n2->narg.next = NULL; 3631556Srgrimes n1->nfor.args = n2; 3641556Srgrimes /* 3651556Srgrimes * Newline or semicolon here is optional (but note 3661556Srgrimes * that the original Bourne shell only allowed NL). 3671556Srgrimes */ 3681556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 3691556Srgrimes tokpushback++; 3701556Srgrimes } 3711556Srgrimes checkkwd = 2; 3721556Srgrimes if ((t = readtoken()) == TDO) 3731556Srgrimes t = TDONE; 3741556Srgrimes else if (t == TBEGIN) 3751556Srgrimes t = TEND; 3761556Srgrimes else 3771556Srgrimes synexpect(-1); 3781556Srgrimes n1->nfor.body = list(0); 3791556Srgrimes if (readtoken() != t) 3801556Srgrimes synexpect(t); 3811556Srgrimes checkkwd = 1; 3821556Srgrimes break; 3831556Srgrimes case TCASE: 3841556Srgrimes n1 = (union node *)stalloc(sizeof (struct ncase)); 3851556Srgrimes n1->type = NCASE; 3861556Srgrimes if (readtoken() != TWORD) 3871556Srgrimes synexpect(TWORD); 3881556Srgrimes n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 3891556Srgrimes n2->type = NARG; 3901556Srgrimes n2->narg.text = wordtext; 3911556Srgrimes n2->narg.backquote = backquotelist; 3921556Srgrimes n2->narg.next = NULL; 3931556Srgrimes while (readtoken() == TNL); 3941556Srgrimes if (lasttoken != TWORD || ! equal(wordtext, "in")) 3951556Srgrimes synerror("expecting \"in\""); 3961556Srgrimes cpp = &n1->ncase.cases; 3972760Ssef checkkwd = 2, readtoken(); 3982760Ssef do { 3991556Srgrimes *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 4001556Srgrimes cp->type = NCLIST; 4011556Srgrimes app = &cp->nclist.pattern; 4021556Srgrimes for (;;) { 4031556Srgrimes *app = ap = (union node *)stalloc(sizeof (struct narg)); 4041556Srgrimes ap->type = NARG; 4051556Srgrimes ap->narg.text = wordtext; 4061556Srgrimes ap->narg.backquote = backquotelist; 4072760Ssef if (checkkwd = 2, readtoken() != TPIPE) 4081556Srgrimes break; 4091556Srgrimes app = &ap->narg.next; 4102760Ssef readtoken(); 4111556Srgrimes } 4121556Srgrimes ap->narg.next = NULL; 4131556Srgrimes if (lasttoken != TRP) 4141556Srgrimes synexpect(TRP); 4151556Srgrimes cp->nclist.body = list(0); 4162760Ssef 4172760Ssef checkkwd = 2; 4182760Ssef if ((t = readtoken()) != TESAC) { 4192760Ssef if (t != TENDCASE) 4202760Ssef synexpect(TENDCASE); 4212760Ssef else 4222760Ssef checkkwd = 2, readtoken(); 4232760Ssef } 4241556Srgrimes cpp = &cp->nclist.next; 4252760Ssef } while(lasttoken != TESAC); 4261556Srgrimes *cpp = NULL; 4271556Srgrimes checkkwd = 1; 4281556Srgrimes break; 4291556Srgrimes case TLP: 4301556Srgrimes n1 = (union node *)stalloc(sizeof (struct nredir)); 4311556Srgrimes n1->type = NSUBSHELL; 4321556Srgrimes n1->nredir.n = list(0); 4331556Srgrimes n1->nredir.redirect = NULL; 4341556Srgrimes if (readtoken() != TRP) 4351556Srgrimes synexpect(TRP); 4361556Srgrimes checkkwd = 1; 4371556Srgrimes break; 4381556Srgrimes case TBEGIN: 4391556Srgrimes n1 = list(0); 4401556Srgrimes if (readtoken() != TEND) 4411556Srgrimes synexpect(TEND); 4421556Srgrimes checkkwd = 1; 4431556Srgrimes break; 4441556Srgrimes /* Handle an empty command like other simple commands. */ 4451556Srgrimes case TNL: 4461556Srgrimes case TWORD: 4471556Srgrimes tokpushback++; 4481556Srgrimes return simplecmd(rpp, redir); 4491556Srgrimes default: 4501556Srgrimes synexpect(-1); 4511556Srgrimes } 4521556Srgrimes 4531556Srgrimes /* Now check for redirection which may follow command */ 4541556Srgrimes while (readtoken() == TREDIR) { 4551556Srgrimes *rpp = n2 = redirnode; 4561556Srgrimes rpp = &n2->nfile.next; 4571556Srgrimes parsefname(); 4581556Srgrimes } 4591556Srgrimes tokpushback++; 4601556Srgrimes *rpp = NULL; 4611556Srgrimes if (redir) { 4621556Srgrimes if (n1->type != NSUBSHELL) { 4631556Srgrimes n2 = (union node *)stalloc(sizeof (struct nredir)); 4641556Srgrimes n2->type = NREDIR; 4651556Srgrimes n2->nredir.n = n1; 4661556Srgrimes n1 = n2; 4671556Srgrimes } 4681556Srgrimes n1->nredir.redirect = redir; 4691556Srgrimes } 4701556Srgrimes return n1; 4711556Srgrimes} 4721556Srgrimes 4731556Srgrimes 4741556SrgrimesSTATIC union node * 4758855Srgrimessimplecmd(rpp, redir) 4761556Srgrimes union node **rpp, *redir; 4771556Srgrimes { 4781556Srgrimes union node *args, **app; 4791556Srgrimes union node **orig_rpp = rpp; 4801556Srgrimes union node *n; 4811556Srgrimes 4821556Srgrimes /* If we don't have any redirections already, then we must reset */ 4831556Srgrimes /* rpp to be the address of the local redir variable. */ 4841556Srgrimes if (redir == 0) 4851556Srgrimes rpp = &redir; 4861556Srgrimes 4871556Srgrimes args = NULL; 4881556Srgrimes app = &args; 4898855Srgrimes /* 4901556Srgrimes * We save the incoming value, because we need this for shell 4911556Srgrimes * functions. There can not be a redirect or an argument between 4928855Srgrimes * the function name and the open parenthesis. 4931556Srgrimes */ 4941556Srgrimes orig_rpp = rpp; 4951556Srgrimes 4961556Srgrimes for (;;) { 4971556Srgrimes if (readtoken() == TWORD) { 4981556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 4991556Srgrimes n->type = NARG; 5001556Srgrimes n->narg.text = wordtext; 5011556Srgrimes n->narg.backquote = backquotelist; 5021556Srgrimes *app = n; 5031556Srgrimes app = &n->narg.next; 5041556Srgrimes } else if (lasttoken == TREDIR) { 5051556Srgrimes *rpp = n = redirnode; 5061556Srgrimes rpp = &n->nfile.next; 5071556Srgrimes parsefname(); /* read name of redirection file */ 5081556Srgrimes } else if (lasttoken == TLP && app == &args->narg.next 5091556Srgrimes && rpp == orig_rpp) { 5101556Srgrimes /* We have a function */ 5111556Srgrimes if (readtoken() != TRP) 5121556Srgrimes synexpect(TRP); 5131556Srgrimes#ifdef notdef 5141556Srgrimes if (! goodname(n->narg.text)) 5151556Srgrimes synerror("Bad function name"); 5161556Srgrimes#endif 5171556Srgrimes n->type = NDEFUN; 5181556Srgrimes n->narg.next = command(); 5191556Srgrimes return n; 5201556Srgrimes } else { 5211556Srgrimes tokpushback++; 5221556Srgrimes break; 5231556Srgrimes } 5241556Srgrimes } 5251556Srgrimes *app = NULL; 5261556Srgrimes *rpp = NULL; 5271556Srgrimes n = (union node *)stalloc(sizeof (struct ncmd)); 5281556Srgrimes n->type = NCMD; 5291556Srgrimes n->ncmd.backgnd = 0; 5301556Srgrimes n->ncmd.args = args; 5311556Srgrimes n->ncmd.redirect = redir; 5321556Srgrimes return n; 5331556Srgrimes} 5341556Srgrimes 5351556Srgrimes 5361556SrgrimesSTATIC void 5371556Srgrimesparsefname() { 5381556Srgrimes union node *n = redirnode; 5391556Srgrimes 5401556Srgrimes if (readtoken() != TWORD) 5411556Srgrimes synexpect(-1); 5421556Srgrimes if (n->type == NHERE) { 5431556Srgrimes struct heredoc *here = heredoc; 5441556Srgrimes struct heredoc *p; 5451556Srgrimes int i; 5461556Srgrimes 5471556Srgrimes if (quoteflag == 0) 5481556Srgrimes n->type = NXHERE; 5491556Srgrimes TRACE(("Here document %d\n", n->type)); 5501556Srgrimes if (here->striptabs) { 5511556Srgrimes while (*wordtext == '\t') 5521556Srgrimes wordtext++; 5531556Srgrimes } 5541556Srgrimes if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 5551556Srgrimes synerror("Illegal eof marker for << redirection"); 5561556Srgrimes rmescapes(wordtext); 5571556Srgrimes here->eofmark = wordtext; 5581556Srgrimes here->next = NULL; 5591556Srgrimes if (heredoclist == NULL) 5601556Srgrimes heredoclist = here; 5611556Srgrimes else { 5621556Srgrimes for (p = heredoclist ; p->next ; p = p->next); 5631556Srgrimes p->next = here; 5641556Srgrimes } 5651556Srgrimes } else if (n->type == NTOFD || n->type == NFROMFD) { 5661556Srgrimes if (is_digit(wordtext[0])) 5671556Srgrimes n->ndup.dupfd = digit_val(wordtext[0]); 5681556Srgrimes else if (wordtext[0] == '-') 5691556Srgrimes n->ndup.dupfd = -1; 5701556Srgrimes else 5711556Srgrimes goto bad; 5721556Srgrimes if (wordtext[1] != '\0') { 5731556Srgrimesbad: 5741556Srgrimes synerror("Bad fd number"); 5751556Srgrimes } 5761556Srgrimes } else { 5771556Srgrimes n->nfile.fname = (union node *)stalloc(sizeof (struct narg)); 5781556Srgrimes n = n->nfile.fname; 5791556Srgrimes n->type = NARG; 5801556Srgrimes n->narg.next = NULL; 5811556Srgrimes n->narg.text = wordtext; 5821556Srgrimes n->narg.backquote = backquotelist; 5831556Srgrimes } 5841556Srgrimes} 5851556Srgrimes 5861556Srgrimes 5871556Srgrimes/* 5881556Srgrimes * Input any here documents. 5891556Srgrimes */ 5901556Srgrimes 5911556SrgrimesSTATIC void 5921556Srgrimesparseheredoc() { 5931556Srgrimes struct heredoc *here; 5941556Srgrimes union node *n; 5951556Srgrimes 5961556Srgrimes while (heredoclist) { 5971556Srgrimes here = heredoclist; 5981556Srgrimes heredoclist = here->next; 5991556Srgrimes if (needprompt) { 6001556Srgrimes setprompt(2); 6011556Srgrimes needprompt = 0; 6021556Srgrimes } 6031556Srgrimes readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 6041556Srgrimes here->eofmark, here->striptabs); 6051556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 6061556Srgrimes n->narg.type = NARG; 6071556Srgrimes n->narg.next = NULL; 6081556Srgrimes n->narg.text = wordtext; 6091556Srgrimes n->narg.backquote = backquotelist; 6101556Srgrimes here->here->nhere.doc = n; 6111556Srgrimes } 6121556Srgrimes} 6131556Srgrimes 6141556SrgrimesSTATIC int 6151556Srgrimespeektoken() { 6161556Srgrimes int t; 6171556Srgrimes 6181556Srgrimes t = readtoken(); 6191556Srgrimes tokpushback++; 6201556Srgrimes return (t); 6211556Srgrimes} 6221556Srgrimes 6231556SrgrimesSTATIC int xxreadtoken(); 6241556Srgrimes 6251556SrgrimesSTATIC int 6261556Srgrimesreadtoken() { 6271556Srgrimes int t; 6281556Srgrimes int savecheckkwd = checkkwd; 6291556Srgrimes struct alias *ap; 6301556Srgrimes#ifdef DEBUG 6311556Srgrimes int alreadyseen = tokpushback; 6321556Srgrimes#endif 6338855Srgrimes 6341556Srgrimes top: 6351556Srgrimes t = xxreadtoken(); 6361556Srgrimes 6371556Srgrimes if (checkkwd) { 6381556Srgrimes /* 6391556Srgrimes * eat newlines 6401556Srgrimes */ 6411556Srgrimes if (checkkwd == 2) { 6421556Srgrimes checkkwd = 0; 6431556Srgrimes while (t == TNL) { 6441556Srgrimes parseheredoc(); 6451556Srgrimes t = xxreadtoken(); 6461556Srgrimes } 6471556Srgrimes } else 6481556Srgrimes checkkwd = 0; 6491556Srgrimes /* 6501556Srgrimes * check for keywords and aliases 6511556Srgrimes */ 6521556Srgrimes if (t == TWORD && !quoteflag) { 6531556Srgrimes register char * const *pp, *s; 6541556Srgrimes 6551556Srgrimes for (pp = (char **)parsekwd; *pp; pp++) { 6561556Srgrimes if (**pp == *wordtext && equal(*pp, wordtext)) { 6571556Srgrimes lasttoken = t = pp - parsekwd + KWDOFFSET; 6581556Srgrimes TRACE(("keyword %s recognized\n", tokname[t])); 6591556Srgrimes goto out; 6601556Srgrimes } 6611556Srgrimes } 6621556Srgrimes if (ap = lookupalias(wordtext, 1)) { 6631556Srgrimes pushstring(ap->val, strlen(ap->val), ap); 6641556Srgrimes checkkwd = savecheckkwd; 6651556Srgrimes goto top; 6661556Srgrimes } 6671556Srgrimes } 6681556Srgrimesout: 6691556Srgrimes checkkwd = 0; 6701556Srgrimes } 6711556Srgrimes#ifdef DEBUG 6721556Srgrimes if (!alreadyseen) 6731556Srgrimes TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 6741556Srgrimes else 6751556Srgrimes TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 6761556Srgrimes#endif 6771556Srgrimes return (t); 6781556Srgrimes} 6791556Srgrimes 6801556Srgrimes 6811556Srgrimes/* 6821556Srgrimes * Read the next input token. 6831556Srgrimes * If the token is a word, we set backquotelist to the list of cmds in 6841556Srgrimes * backquotes. We set quoteflag to true if any part of the word was 6851556Srgrimes * quoted. 6861556Srgrimes * If the token is TREDIR, then we set redirnode to a structure containing 6871556Srgrimes * the redirection. 6881556Srgrimes * In all cases, the variable startlinno is set to the number of the line 6891556Srgrimes * on which the token starts. 6901556Srgrimes * 6911556Srgrimes * [Change comment: here documents and internal procedures] 6921556Srgrimes * [Readtoken shouldn't have any arguments. Perhaps we should make the 6931556Srgrimes * word parsing code into a separate routine. In this case, readtoken 6941556Srgrimes * doesn't need to have any internal procedures, but parseword does. 6951556Srgrimes * We could also make parseoperator in essence the main routine, and 6961556Srgrimes * have parseword (readtoken1?) handle both words and redirection.] 6971556Srgrimes */ 6981556Srgrimes 6991556Srgrimes#define RETURN(token) return lasttoken = token 7001556Srgrimes 7011556SrgrimesSTATIC int 7021556Srgrimesxxreadtoken() { 7031556Srgrimes register c; 7041556Srgrimes 7051556Srgrimes if (tokpushback) { 7061556Srgrimes tokpushback = 0; 7071556Srgrimes return lasttoken; 7081556Srgrimes } 7091556Srgrimes if (needprompt) { 7101556Srgrimes setprompt(2); 7111556Srgrimes needprompt = 0; 7121556Srgrimes } 7131556Srgrimes startlinno = plinno; 7141556Srgrimes for (;;) { /* until token or start of word found */ 7151556Srgrimes c = pgetc_macro(); 7161556Srgrimes if (c == ' ' || c == '\t') 7171556Srgrimes continue; /* quick check for white space first */ 7181556Srgrimes switch (c) { 7191556Srgrimes case ' ': case '\t': 7201556Srgrimes continue; 7211556Srgrimes case '#': 7221556Srgrimes while ((c = pgetc()) != '\n' && c != PEOF); 7231556Srgrimes pungetc(); 7241556Srgrimes continue; 7251556Srgrimes case '\\': 7261556Srgrimes if (pgetc() == '\n') { 7271556Srgrimes startlinno = ++plinno; 7281556Srgrimes if (doprompt) 7291556Srgrimes setprompt(2); 7301556Srgrimes else 7311556Srgrimes setprompt(0); 7321556Srgrimes continue; 7331556Srgrimes } 7341556Srgrimes pungetc(); 7351556Srgrimes goto breakloop; 7361556Srgrimes case '\n': 7371556Srgrimes plinno++; 7381556Srgrimes needprompt = doprompt; 7391556Srgrimes RETURN(TNL); 7401556Srgrimes case PEOF: 7411556Srgrimes RETURN(TEOF); 7421556Srgrimes case '&': 7431556Srgrimes if (pgetc() == '&') 7441556Srgrimes RETURN(TAND); 7451556Srgrimes pungetc(); 7461556Srgrimes RETURN(TBACKGND); 7471556Srgrimes case '|': 7481556Srgrimes if (pgetc() == '|') 7491556Srgrimes RETURN(TOR); 7501556Srgrimes pungetc(); 7511556Srgrimes RETURN(TPIPE); 7521556Srgrimes case ';': 7531556Srgrimes if (pgetc() == ';') 7541556Srgrimes RETURN(TENDCASE); 7551556Srgrimes pungetc(); 7561556Srgrimes RETURN(TSEMI); 7571556Srgrimes case '(': 7581556Srgrimes RETURN(TLP); 7591556Srgrimes case ')': 7601556Srgrimes RETURN(TRP); 7611556Srgrimes default: 7621556Srgrimes goto breakloop; 7631556Srgrimes } 7641556Srgrimes } 7651556Srgrimesbreakloop: 7661556Srgrimes return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 7671556Srgrimes#undef RETURN 7681556Srgrimes} 7691556Srgrimes 7701556Srgrimes 7711556Srgrimes 7721556Srgrimes/* 7731556Srgrimes * If eofmark is NULL, read a word or a redirection symbol. If eofmark 7741556Srgrimes * is not NULL, read a here document. In the latter case, eofmark is the 7751556Srgrimes * word which marks the end of the document and striptabs is true if 7761556Srgrimes * leading tabs should be stripped from the document. The argument firstc 7771556Srgrimes * is the first character of the input token or document. 7781556Srgrimes * 7791556Srgrimes * Because C does not have internal subroutines, I have simulated them 7801556Srgrimes * using goto's to implement the subroutine linkage. The following macros 7811556Srgrimes * will run code that appears at the end of readtoken1. 7821556Srgrimes */ 7831556Srgrimes 7841556Srgrimes#define CHECKEND() {goto checkend; checkend_return:;} 7851556Srgrimes#define PARSEREDIR() {goto parseredir; parseredir_return:;} 7861556Srgrimes#define PARSESUB() {goto parsesub; parsesub_return:;} 7871556Srgrimes#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} 7881556Srgrimes#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} 7891556Srgrimes#define PARSEARITH() {goto parsearith; parsearith_return:;} 7901556Srgrimes 7911556SrgrimesSTATIC int 7921556Srgrimesreadtoken1(firstc, syntax, eofmark, striptabs) 7931556Srgrimes int firstc; 7941556Srgrimes char const *syntax; 7951556Srgrimes char *eofmark; 7961556Srgrimes int striptabs; 7971556Srgrimes { 7981556Srgrimes register c = firstc; 7991556Srgrimes register char *out; 8001556Srgrimes int len; 8011556Srgrimes char line[EOFMARKLEN + 1]; 8021556Srgrimes struct nodelist *bqlist; 8031556Srgrimes int quotef; 8041556Srgrimes int dblquote; 8051556Srgrimes int varnest; /* levels of variables expansion */ 8061556Srgrimes int arinest; /* levels of arithmetic expansion */ 8071556Srgrimes int parenlevel; /* levels of parens in arithmetic */ 8081556Srgrimes int oldstyle; 8091556Srgrimes char const *prevsyntax; /* syntax before arithmetic */ 8101556Srgrimes 8111556Srgrimes startlinno = plinno; 8121556Srgrimes dblquote = 0; 8131556Srgrimes if (syntax == DQSYNTAX) 8141556Srgrimes dblquote = 1; 8151556Srgrimes quotef = 0; 8161556Srgrimes bqlist = NULL; 8171556Srgrimes varnest = 0; 8181556Srgrimes arinest = 0; 8191556Srgrimes parenlevel = 0; 8201556Srgrimes 8211556Srgrimes STARTSTACKSTR(out); 8221556Srgrimes loop: { /* for each line, until end of word */ 8231556Srgrimes#if ATTY 8241556Srgrimes if (c == '\034' && doprompt 8251556Srgrimes && attyset() && ! equal(termval(), "emacs")) { 8261556Srgrimes attyline(); 8271556Srgrimes if (syntax == BASESYNTAX) 8281556Srgrimes return readtoken(); 8291556Srgrimes c = pgetc(); 8301556Srgrimes goto loop; 8311556Srgrimes } 8321556Srgrimes#endif 8331556Srgrimes CHECKEND(); /* set c to PEOF if at end of here document */ 8341556Srgrimes for (;;) { /* until end of line or end of word */ 8351556Srgrimes CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ 8361556Srgrimes if (parsebackquote && c == '\\') { 8371556Srgrimes c = pgetc(); /* XXX - compat with old /bin/sh */ 8385507Spaul if (/*c != '\\' && */c != '`' && c != '$') { 8391556Srgrimes pungetc(); 8401556Srgrimes c = '\\'; 8411556Srgrimes } 8421556Srgrimes } 8431556Srgrimes switch(syntax[c]) { 8441556Srgrimes case CNL: /* '\n' */ 8451556Srgrimes if (syntax == BASESYNTAX) 8461556Srgrimes goto endword; /* exit outer loop */ 8471556Srgrimes USTPUTC(c, out); 8481556Srgrimes plinno++; 8491556Srgrimes if (doprompt) 8501556Srgrimes setprompt(2); 8511556Srgrimes else 8521556Srgrimes setprompt(0); 8531556Srgrimes c = pgetc(); 8541556Srgrimes goto loop; /* continue outer loop */ 8551556Srgrimes case CWORD: 8561556Srgrimes USTPUTC(c, out); 8571556Srgrimes break; 8581556Srgrimes case CCTL: 8591556Srgrimes if (eofmark == NULL || dblquote) 8601556Srgrimes USTPUTC(CTLESC, out); 8611556Srgrimes USTPUTC(c, out); 8621556Srgrimes break; 8631556Srgrimes case CBACK: /* backslash */ 8641556Srgrimes c = pgetc(); 8651556Srgrimes if (c == PEOF) { 8661556Srgrimes USTPUTC('\\', out); 8671556Srgrimes pungetc(); 8681556Srgrimes } else if (c == '\n') { 8691556Srgrimes if (doprompt) 8701556Srgrimes setprompt(2); 8711556Srgrimes else 8721556Srgrimes setprompt(0); 8731556Srgrimes } else { 8741556Srgrimes if (dblquote && c != '\\' && c != '`' && c != '$' 8751556Srgrimes && (c != '"' || eofmark != NULL)) 8761556Srgrimes USTPUTC('\\', out); 8771556Srgrimes if (SQSYNTAX[c] == CCTL) 8781556Srgrimes USTPUTC(CTLESC, out); 8791556Srgrimes USTPUTC(c, out); 8801556Srgrimes quotef++; 8811556Srgrimes } 8821556Srgrimes break; 8831556Srgrimes case CSQUOTE: 8841556Srgrimes syntax = SQSYNTAX; 8851556Srgrimes break; 8861556Srgrimes case CDQUOTE: 8871556Srgrimes syntax = DQSYNTAX; 8881556Srgrimes dblquote = 1; 8891556Srgrimes break; 8901556Srgrimes case CENDQUOTE: 8911556Srgrimes if (eofmark) { 8921556Srgrimes USTPUTC(c, out); 8931556Srgrimes } else { 8941556Srgrimes if (arinest) 8951556Srgrimes syntax = ARISYNTAX; 8961556Srgrimes else 8971556Srgrimes syntax = BASESYNTAX; 8981556Srgrimes quotef++; 8991556Srgrimes dblquote = 0; 9001556Srgrimes } 9011556Srgrimes break; 9021556Srgrimes case CVAR: /* '$' */ 9031556Srgrimes PARSESUB(); /* parse substitution */ 9041556Srgrimes break; 9051556Srgrimes case CENDVAR: /* '}' */ 9061556Srgrimes if (varnest > 0) { 9071556Srgrimes varnest--; 9081556Srgrimes USTPUTC(CTLENDVAR, out); 9091556Srgrimes } else { 9101556Srgrimes USTPUTC(c, out); 9111556Srgrimes } 9121556Srgrimes break; 9131556Srgrimes case CLP: /* '(' in arithmetic */ 9141556Srgrimes parenlevel++; 9151556Srgrimes USTPUTC(c, out); 9161556Srgrimes break; 9171556Srgrimes case CRP: /* ')' in arithmetic */ 9181556Srgrimes if (parenlevel > 0) { 9191556Srgrimes USTPUTC(c, out); 9201556Srgrimes --parenlevel; 9211556Srgrimes } else { 9221556Srgrimes if (pgetc() == ')') { 9231556Srgrimes if (--arinest == 0) { 9241556Srgrimes USTPUTC(CTLENDARI, out); 9251556Srgrimes syntax = prevsyntax; 9261556Srgrimes } else 9271556Srgrimes USTPUTC(')', out); 9281556Srgrimes } else { 9298855Srgrimes /* 9301556Srgrimes * unbalanced parens 9311556Srgrimes * (don't 2nd guess - no error) 9321556Srgrimes */ 9331556Srgrimes pungetc(); 9341556Srgrimes USTPUTC(')', out); 9351556Srgrimes } 9361556Srgrimes } 9371556Srgrimes break; 9381556Srgrimes case CBQUOTE: /* '`' */ 9391556Srgrimes PARSEBACKQOLD(); 9401556Srgrimes break; 9411556Srgrimes case CEOF: 9421556Srgrimes goto endword; /* exit outer loop */ 9431556Srgrimes default: 9441556Srgrimes if (varnest == 0) 9451556Srgrimes goto endword; /* exit outer loop */ 9461556Srgrimes USTPUTC(c, out); 9471556Srgrimes } 9481556Srgrimes c = pgetc_macro(); 9491556Srgrimes } 9501556Srgrimes } 9511556Srgrimesendword: 9521556Srgrimes if (syntax == ARISYNTAX) 9531556Srgrimes synerror("Missing '))'"); 9541556Srgrimes if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL) 9551556Srgrimes synerror("Unterminated quoted string"); 9561556Srgrimes if (varnest != 0) { 9571556Srgrimes startlinno = plinno; 9581556Srgrimes synerror("Missing '}'"); 9591556Srgrimes } 9601556Srgrimes USTPUTC('\0', out); 9611556Srgrimes len = out - stackblock(); 9621556Srgrimes out = stackblock(); 9631556Srgrimes if (eofmark == NULL) { 9641556Srgrimes if ((c == '>' || c == '<') 9651556Srgrimes && quotef == 0 9661556Srgrimes && len <= 2 9671556Srgrimes && (*out == '\0' || is_digit(*out))) { 9681556Srgrimes PARSEREDIR(); 9691556Srgrimes return lasttoken = TREDIR; 9701556Srgrimes } else { 9711556Srgrimes pungetc(); 9721556Srgrimes } 9731556Srgrimes } 9741556Srgrimes quoteflag = quotef; 9751556Srgrimes backquotelist = bqlist; 9761556Srgrimes grabstackblock(len); 9771556Srgrimes wordtext = out; 9781556Srgrimes return lasttoken = TWORD; 9791556Srgrimes/* end of readtoken routine */ 9801556Srgrimes 9811556Srgrimes 9821556Srgrimes 9831556Srgrimes/* 9841556Srgrimes * Check to see whether we are at the end of the here document. When this 9851556Srgrimes * is called, c is set to the first character of the next input line. If 9861556Srgrimes * we are at the end of the here document, this routine sets the c to PEOF. 9871556Srgrimes */ 9881556Srgrimes 9891556Srgrimescheckend: { 9901556Srgrimes if (eofmark) { 9911556Srgrimes if (striptabs) { 9921556Srgrimes while (c == '\t') 9931556Srgrimes c = pgetc(); 9941556Srgrimes } 9951556Srgrimes if (c == *eofmark) { 9961556Srgrimes if (pfgets(line, sizeof line) != NULL) { 9971556Srgrimes register char *p, *q; 9981556Srgrimes 9991556Srgrimes p = line; 10001556Srgrimes for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 10011556Srgrimes if (*p == '\n' && *q == '\0') { 10021556Srgrimes c = PEOF; 10031556Srgrimes plinno++; 10041556Srgrimes needprompt = doprompt; 10051556Srgrimes } else { 10061556Srgrimes pushstring(line, strlen(line), NULL); 10071556Srgrimes } 10081556Srgrimes } 10091556Srgrimes } 10101556Srgrimes } 10111556Srgrimes goto checkend_return; 10121556Srgrimes} 10131556Srgrimes 10141556Srgrimes 10151556Srgrimes/* 10161556Srgrimes * Parse a redirection operator. The variable "out" points to a string 10171556Srgrimes * specifying the fd to be redirected. The variable "c" contains the 10181556Srgrimes * first character of the redirection operator. 10191556Srgrimes */ 10201556Srgrimes 10211556Srgrimesparseredir: { 10221556Srgrimes char fd = *out; 10231556Srgrimes union node *np; 10241556Srgrimes 10251556Srgrimes np = (union node *)stalloc(sizeof (struct nfile)); 10261556Srgrimes if (c == '>') { 10271556Srgrimes np->nfile.fd = 1; 10281556Srgrimes c = pgetc(); 10291556Srgrimes if (c == '>') 10301556Srgrimes np->type = NAPPEND; 10311556Srgrimes else if (c == '&') 10321556Srgrimes np->type = NTOFD; 10331556Srgrimes else { 10341556Srgrimes np->type = NTO; 10351556Srgrimes pungetc(); 10361556Srgrimes } 10371556Srgrimes } else { /* c == '<' */ 10381556Srgrimes np->nfile.fd = 0; 10391556Srgrimes c = pgetc(); 10401556Srgrimes if (c == '<') { 10411556Srgrimes if (sizeof (struct nfile) != sizeof (struct nhere)) { 10421556Srgrimes np = (union node *)stalloc(sizeof (struct nhere)); 10431556Srgrimes np->nfile.fd = 0; 10441556Srgrimes } 10451556Srgrimes np->type = NHERE; 10461556Srgrimes heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 10471556Srgrimes heredoc->here = np; 10481556Srgrimes if ((c = pgetc()) == '-') { 10491556Srgrimes heredoc->striptabs = 1; 10501556Srgrimes } else { 10511556Srgrimes heredoc->striptabs = 0; 10521556Srgrimes pungetc(); 10531556Srgrimes } 10541556Srgrimes } else if (c == '&') 10551556Srgrimes np->type = NFROMFD; 10561556Srgrimes else { 10571556Srgrimes np->type = NFROM; 10581556Srgrimes pungetc(); 10591556Srgrimes } 10601556Srgrimes } 10611556Srgrimes if (fd != '\0') 10621556Srgrimes np->nfile.fd = digit_val(fd); 10631556Srgrimes redirnode = np; 10641556Srgrimes goto parseredir_return; 10651556Srgrimes} 10661556Srgrimes 10671556Srgrimes 10681556Srgrimes/* 10691556Srgrimes * Parse a substitution. At this point, we have read the dollar sign 10701556Srgrimes * and nothing else. 10711556Srgrimes */ 10721556Srgrimes 10731556Srgrimesparsesub: { 10741556Srgrimes int subtype; 10751556Srgrimes int typeloc; 10761556Srgrimes int flags; 10771556Srgrimes char *p; 10781556Srgrimes#ifndef GDB_HACK 10791556Srgrimes static const char types[] = "}-+?="; 10801556Srgrimes#endif 10811556Srgrimes 10821556Srgrimes c = pgetc(); 10831556Srgrimes if (c != '(' && c != '{' && !is_name(c) && !is_special(c)) { 10841556Srgrimes USTPUTC('$', out); 10851556Srgrimes pungetc(); 10861556Srgrimes } else if (c == '(') { /* $(command) or $((arith)) */ 10871556Srgrimes if (pgetc() == '(') { 10881556Srgrimes PARSEARITH(); 10891556Srgrimes } else { 10901556Srgrimes pungetc(); 10911556Srgrimes PARSEBACKQNEW(); 10921556Srgrimes } 10931556Srgrimes } else { 10941556Srgrimes USTPUTC(CTLVAR, out); 10951556Srgrimes typeloc = out - stackblock(); 10961556Srgrimes USTPUTC(VSNORMAL, out); 10971556Srgrimes subtype = VSNORMAL; 10981556Srgrimes if (c == '{') { 10991556Srgrimes c = pgetc(); 11001556Srgrimes subtype = 0; 11011556Srgrimes } 11021556Srgrimes if (is_name(c)) { 11031556Srgrimes do { 11041556Srgrimes STPUTC(c, out); 11051556Srgrimes c = pgetc(); 11061556Srgrimes } while (is_in_name(c)); 11071556Srgrimes } else { 11081556Srgrimes if (! is_special(c)) 11091556Srgrimesbadsub: synerror("Bad substitution"); 11101556Srgrimes USTPUTC(c, out); 11111556Srgrimes c = pgetc(); 11121556Srgrimes } 11131556Srgrimes STPUTC('=', out); 11141556Srgrimes flags = 0; 11151556Srgrimes if (subtype == 0) { 11161556Srgrimes if (c == ':') { 11171556Srgrimes flags = VSNUL; 11181556Srgrimes c = pgetc(); 11191556Srgrimes } 11201556Srgrimes p = strchr(types, c); 11211556Srgrimes if (p == NULL) 11221556Srgrimes goto badsub; 11231556Srgrimes subtype = p - types + VSNORMAL; 11241556Srgrimes } else { 11251556Srgrimes pungetc(); 11261556Srgrimes } 11271556Srgrimes if (dblquote || arinest) 11281556Srgrimes flags |= VSQUOTE; 11291556Srgrimes *(stackblock() + typeloc) = subtype | flags; 11301556Srgrimes if (subtype != VSNORMAL) 11311556Srgrimes varnest++; 11321556Srgrimes } 11331556Srgrimes goto parsesub_return; 11341556Srgrimes} 11351556Srgrimes 11361556Srgrimes 11371556Srgrimes/* 11381556Srgrimes * Called to parse command substitutions. Newstyle is set if the command 11391556Srgrimes * is enclosed inside $(...); nlpp is a pointer to the head of the linked 11401556Srgrimes * list of commands (passed by reference), and savelen is the number of 11411556Srgrimes * characters on the top of the stack which must be preserved. 11421556Srgrimes */ 11431556Srgrimes 11441556Srgrimesparsebackq: { 11451556Srgrimes struct nodelist **nlpp; 11461556Srgrimes int savepbq; 11471556Srgrimes union node *n; 11481556Srgrimes char *volatile str; 11491556Srgrimes struct jmploc jmploc; 11501556Srgrimes struct jmploc *volatile savehandler; 11511556Srgrimes int savelen; 11521556Srgrimes 11531556Srgrimes savepbq = parsebackquote; 11541556Srgrimes if (setjmp(jmploc.loc)) { 11551556Srgrimes if (str) 11561556Srgrimes ckfree(str); 11571556Srgrimes parsebackquote = 0; 11581556Srgrimes handler = savehandler; 11591556Srgrimes longjmp(handler->loc, 1); 11601556Srgrimes } 11611556Srgrimes INTOFF; 11621556Srgrimes str = NULL; 11631556Srgrimes savelen = out - stackblock(); 11641556Srgrimes if (savelen > 0) { 11651556Srgrimes str = ckmalloc(savelen); 11661556Srgrimes bcopy(stackblock(), str, savelen); 11671556Srgrimes } 11681556Srgrimes savehandler = handler; 11691556Srgrimes handler = &jmploc; 11701556Srgrimes INTON; 11711556Srgrimes if (oldstyle) { 11721556Srgrimes /* We must read until the closing backquote, giving special 11731556Srgrimes treatment to some slashes, and then push the string and 11741556Srgrimes reread it as input, interpreting it normally. */ 11751556Srgrimes register char *out; 11761556Srgrimes register c; 11771556Srgrimes int savelen; 11781556Srgrimes char *str; 11798855Srgrimes 11801556Srgrimes STARTSTACKSTR(out); 11811556Srgrimes while ((c = pgetc ()) != '`') { 11821556Srgrimes if (c == '\\') { 11831556Srgrimes c = pgetc (); 11845507Spaul if ( c != '\\' && c != '`' && c != '$' 11851556Srgrimes && (!dblquote || c != '"')) 11861556Srgrimes STPUTC('\\', out); 11871556Srgrimes } 11881556Srgrimes STPUTC(c, out); 11891556Srgrimes } 11901556Srgrimes STPUTC('\0', out); 11911556Srgrimes savelen = out - stackblock(); 11921556Srgrimes if (savelen > 0) { 11931556Srgrimes str = ckmalloc(savelen); 11941556Srgrimes bcopy(stackblock(), str, savelen); 11951556Srgrimes } 11961556Srgrimes setinputstring(str, 1); 11971556Srgrimes } 11981556Srgrimes nlpp = &bqlist; 11991556Srgrimes while (*nlpp) 12001556Srgrimes nlpp = &(*nlpp)->next; 12011556Srgrimes *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 12021556Srgrimes (*nlpp)->next = NULL; 12031556Srgrimes parsebackquote = oldstyle; 12041556Srgrimes n = list(0); 12051556Srgrimes if (!oldstyle && (readtoken() != TRP)) 12061556Srgrimes synexpect(TRP); 12071556Srgrimes (*nlpp)->n = n; 12081556Srgrimes /* Start reading from old file again. */ 12091556Srgrimes if (oldstyle) 12101556Srgrimes popfile(); 12111556Srgrimes while (stackblocksize() <= savelen) 12121556Srgrimes growstackblock(); 12131556Srgrimes STARTSTACKSTR(out); 12141556Srgrimes if (str) { 12151556Srgrimes bcopy(str, out, savelen); 12161556Srgrimes STADJUST(savelen, out); 12171556Srgrimes INTOFF; 12181556Srgrimes ckfree(str); 12191556Srgrimes str = NULL; 12201556Srgrimes INTON; 12211556Srgrimes } 12221556Srgrimes parsebackquote = savepbq; 12231556Srgrimes handler = savehandler; 12241556Srgrimes if (arinest || dblquote) 12251556Srgrimes USTPUTC(CTLBACKQ | CTLQUOTE, out); 12261556Srgrimes else 12271556Srgrimes USTPUTC(CTLBACKQ, out); 12281556Srgrimes if (oldstyle) 12291556Srgrimes goto parsebackq_oldreturn; 12301556Srgrimes else 12311556Srgrimes goto parsebackq_newreturn; 12321556Srgrimes} 12331556Srgrimes 12341556Srgrimes/* 12351556Srgrimes * Parse an arithmetic expansion (indicate start of one and set state) 12361556Srgrimes */ 12371556Srgrimesparsearith: { 12381556Srgrimes 12391556Srgrimes if (++arinest == 1) { 12401556Srgrimes prevsyntax = syntax; 12411556Srgrimes syntax = ARISYNTAX; 12421556Srgrimes USTPUTC(CTLARI, out); 12431556Srgrimes } else { 12441556Srgrimes /* 12451556Srgrimes * we collapse embedded arithmetic expansion to 12461556Srgrimes * parenthesis, which should be equivalent 12471556Srgrimes */ 12481556Srgrimes USTPUTC('(', out); 12491556Srgrimes } 12501556Srgrimes goto parsearith_return; 12511556Srgrimes} 12521556Srgrimes 12531556Srgrimes} /* end of readtoken */ 12541556Srgrimes 12551556Srgrimes 12561556Srgrimes 12571556Srgrimes#ifdef mkinit 12581556SrgrimesRESET { 12591556Srgrimes tokpushback = 0; 12601556Srgrimes checkkwd = 0; 12611556Srgrimes} 12621556Srgrimes#endif 12631556Srgrimes 12641556Srgrimes/* 12651556Srgrimes * Returns true if the text contains nothing to expand (no dollar signs 12661556Srgrimes * or backquotes). 12671556Srgrimes */ 12681556Srgrimes 12691556SrgrimesSTATIC int 12701556Srgrimesnoexpand(text) 12711556Srgrimes char *text; 12721556Srgrimes { 12731556Srgrimes register char *p; 12741556Srgrimes register char c; 12751556Srgrimes 12761556Srgrimes p = text; 12771556Srgrimes while ((c = *p++) != '\0') { 12781556Srgrimes if (c == CTLESC) 12791556Srgrimes p++; 12801556Srgrimes else if (BASESYNTAX[c] == CCTL) 12811556Srgrimes return 0; 12821556Srgrimes } 12831556Srgrimes return 1; 12841556Srgrimes} 12851556Srgrimes 12861556Srgrimes 12871556Srgrimes/* 12881556Srgrimes * Return true if the argument is a legal variable name (a letter or 12891556Srgrimes * underscore followed by zero or more letters, underscores, and digits). 12901556Srgrimes */ 12911556Srgrimes 12921556Srgrimesint 12931556Srgrimesgoodname(name) 12941556Srgrimes char *name; 12951556Srgrimes { 12961556Srgrimes register char *p; 12971556Srgrimes 12981556Srgrimes p = name; 12991556Srgrimes if (! is_name(*p)) 13001556Srgrimes return 0; 13011556Srgrimes while (*++p) { 13021556Srgrimes if (! is_in_name(*p)) 13031556Srgrimes return 0; 13041556Srgrimes } 13051556Srgrimes return 1; 13061556Srgrimes} 13071556Srgrimes 13081556Srgrimes 13091556Srgrimes/* 13101556Srgrimes * Called when an unexpected token is read during the parse. The argument 13111556Srgrimes * is the token that is expected, or -1 if more than one type of token can 13121556Srgrimes * occur at this point. 13131556Srgrimes */ 13141556Srgrimes 13151556SrgrimesSTATIC void 13161556Srgrimessynexpect(token) { 13171556Srgrimes char msg[64]; 13181556Srgrimes 13191556Srgrimes if (token >= 0) { 13201556Srgrimes fmtstr(msg, 64, "%s unexpected (expecting %s)", 13211556Srgrimes tokname[lasttoken], tokname[token]); 13221556Srgrimes } else { 13231556Srgrimes fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 13241556Srgrimes } 13251556Srgrimes synerror(msg); 13261556Srgrimes} 13271556Srgrimes 13281556Srgrimes 13291556SrgrimesSTATIC void 13301556Srgrimessynerror(msg) 13311556Srgrimes char *msg; 13321556Srgrimes { 13331556Srgrimes if (commandname) 13341556Srgrimes outfmt(&errout, "%s: %d: ", commandname, startlinno); 13351556Srgrimes outfmt(&errout, "Syntax error: %s\n", msg); 13361556Srgrimes error((char *)NULL); 13371556Srgrimes} 13381556Srgrimes 13391556SrgrimesSTATIC void 13401556Srgrimessetprompt(which) 13411556Srgrimes int which; 13421556Srgrimes { 13431556Srgrimes whichprompt = which; 13441556Srgrimes 13451556Srgrimes if (!el) 13461556Srgrimes out2str(getprompt(NULL)); 13471556Srgrimes} 13481556Srgrimes 13491556Srgrimes/* 13501556Srgrimes * called by editline -- any expansions to the prompt 13511556Srgrimes * should be added here. 13521556Srgrimes */ 13531556Srgrimeschar * 13541556Srgrimesgetprompt(unused) 13551556Srgrimes void *unused; 13561556Srgrimes { 13571556Srgrimes switch (whichprompt) { 13581556Srgrimes case 0: 13591556Srgrimes return ""; 13601556Srgrimes case 1: 13611556Srgrimes return ps1val(); 13621556Srgrimes case 2: 13631556Srgrimes return ps2val(); 13641556Srgrimes default: 13651556Srgrimes return "<internal prompt error>"; 13661556Srgrimes } 13671556Srgrimes} 1368