parser.c revision 222907
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 * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)parser.c 8.7 (Berkeley) 5/16/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/parser.c 222907 2011-06-09 23:12:23Z jilles $"); 401556Srgrimes 4117987Speter#include <stdlib.h> 42149017Sstefanf#include <unistd.h> 43209337Sjilles#include <stdio.h> 4417987Speter 451556Srgrimes#include "shell.h" 461556Srgrimes#include "parser.h" 471556Srgrimes#include "nodes.h" 481556Srgrimes#include "expand.h" /* defines rmescapes() */ 491556Srgrimes#include "syntax.h" 501556Srgrimes#include "options.h" 511556Srgrimes#include "input.h" 521556Srgrimes#include "output.h" 531556Srgrimes#include "var.h" 541556Srgrimes#include "error.h" 551556Srgrimes#include "memalloc.h" 561556Srgrimes#include "mystring.h" 571556Srgrimes#include "alias.h" 5817987Speter#include "show.h" 5959436Scracauer#include "eval.h" 60214304Sjilles#include "exec.h" /* to check for special builtins */ 6117987Speter#ifndef NO_HISTORY 621556Srgrimes#include "myhistedit.h" 6317987Speter#endif 641556Srgrimes 651556Srgrimes/* 661556Srgrimes * Shell command parser. 671556Srgrimes */ 681556Srgrimes 69142845Sobrien#define EOFMARKLEN 79 70142845Sobrien#define PROMPTLEN 128 711556Srgrimes 72214709Sjilles/* values of checkkwd variable */ 73214709Sjilles#define CHKALIAS 0x1 74214709Sjilles#define CHKKWD 0x2 75214709Sjilles#define CHKNL 0x4 76214709Sjilles 771556Srgrimes/* values returned by readtoken */ 7817987Speter#include "token.h" 791556Srgrimes 801556Srgrimes 811556Srgrimes 821556Srgrimesstruct heredoc { 831556Srgrimes struct heredoc *next; /* next here document in list */ 841556Srgrimes union node *here; /* redirection node */ 851556Srgrimes char *eofmark; /* string indicating end of input */ 861556Srgrimes int striptabs; /* if set, strip leading tabs */ 871556Srgrimes}; 881556Srgrimes 89206145Sjillesstruct parser_temp { 90206145Sjilles struct parser_temp *next; 91206145Sjilles void *data; 92206145Sjilles}; 931556Srgrimes 941556Srgrimes 95213760Sobrienstatic struct heredoc *heredoclist; /* list of here documents to read */ 96213760Sobrienstatic int doprompt; /* if set, prompt the user */ 97213760Sobrienstatic int needprompt; /* true if interactive and at start of line */ 98213760Sobrienstatic int lasttoken; /* last token read */ 991556SrgrimesMKINIT int tokpushback; /* last token pushed back */ 100213760Sobrienstatic char *wordtext; /* text of last word returned by readtoken */ 1011556SrgrimesMKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ 102213760Sobrienstatic struct nodelist *backquotelist; 103213760Sobrienstatic union node *redirnode; 104213760Sobrienstatic struct heredoc *heredoc; 105213760Sobrienstatic int quoteflag; /* set if (part of) last token was quoted */ 106213760Sobrienstatic int startlinno; /* line # where last token started */ 107213760Sobrienstatic int funclinno; /* line # where the current function started */ 108213760Sobrienstatic struct parser_temp *parser_temp; 1091556Srgrimes 1101556Srgrimes 111214525Sjillesstatic union node *list(int, int); 112213811Sobrienstatic union node *andor(void); 113213811Sobrienstatic union node *pipeline(void); 114213811Sobrienstatic union node *command(void); 115213811Sobrienstatic union node *simplecmd(union node **, union node *); 116213811Sobrienstatic union node *makename(void); 117213811Sobrienstatic void parsefname(void); 118213811Sobrienstatic void parseheredoc(void); 119213811Sobrienstatic int peektoken(void); 120213811Sobrienstatic int readtoken(void); 121213811Sobrienstatic int xxreadtoken(void); 122213811Sobrienstatic int readtoken1(int, char const *, char *, int); 123213811Sobrienstatic int noexpand(char *); 124213811Sobrienstatic void synexpect(int) __dead2; 125213811Sobrienstatic void synerror(const char *) __dead2; 126213811Sobrienstatic void setprompt(int); 1271556Srgrimes 12817987Speter 129213811Sobrienstatic void * 130206145Sjillesparser_temp_alloc(size_t len) 131206145Sjilles{ 132206145Sjilles struct parser_temp *t; 133206145Sjilles 134206145Sjilles INTOFF; 135206145Sjilles t = ckmalloc(sizeof(*t)); 136206145Sjilles t->data = NULL; 137206145Sjilles t->next = parser_temp; 138206145Sjilles parser_temp = t; 139206145Sjilles t->data = ckmalloc(len); 140206145Sjilles INTON; 141206145Sjilles return t->data; 142206145Sjilles} 143206145Sjilles 144206145Sjilles 145213811Sobrienstatic void * 146206145Sjillesparser_temp_realloc(void *ptr, size_t len) 147206145Sjilles{ 148206145Sjilles struct parser_temp *t; 149206145Sjilles 150206145Sjilles INTOFF; 151206145Sjilles t = parser_temp; 152206145Sjilles if (ptr != t->data) 153206145Sjilles error("bug: parser_temp_realloc misused"); 154206145Sjilles t->data = ckrealloc(t->data, len); 155206145Sjilles INTON; 156206145Sjilles return t->data; 157206145Sjilles} 158206145Sjilles 159206145Sjilles 160213811Sobrienstatic void 161206145Sjillesparser_temp_free_upto(void *ptr) 162206145Sjilles{ 163206145Sjilles struct parser_temp *t; 164206145Sjilles int done = 0; 165206145Sjilles 166206145Sjilles INTOFF; 167206145Sjilles while (parser_temp != NULL && !done) { 168206145Sjilles t = parser_temp; 169206145Sjilles parser_temp = t->next; 170206145Sjilles done = t->data == ptr; 171206145Sjilles ckfree(t->data); 172206145Sjilles ckfree(t); 173206145Sjilles } 174206145Sjilles INTON; 175206145Sjilles if (!done) 176206145Sjilles error("bug: parser_temp_free_upto misused"); 177206145Sjilles} 178206145Sjilles 179206145Sjilles 180213811Sobrienstatic void 181206145Sjillesparser_temp_free_all(void) 182206145Sjilles{ 183206145Sjilles struct parser_temp *t; 184206145Sjilles 185206145Sjilles INTOFF; 186206145Sjilles while (parser_temp != NULL) { 187206145Sjilles t = parser_temp; 188206145Sjilles parser_temp = t->next; 189206145Sjilles ckfree(t->data); 190206145Sjilles ckfree(t); 191206145Sjilles } 192206145Sjilles INTON; 193206145Sjilles} 194206145Sjilles 195206145Sjilles 1961556Srgrimes/* 1971556Srgrimes * Read and parse a command. Returns NEOF on end of file. (NULL is a 1981556Srgrimes * valid parse tree indicating a blank line.) 1991556Srgrimes */ 2001556Srgrimes 2011556Srgrimesunion node * 20290111Simpparsecmd(int interact) 20317987Speter{ 2041556Srgrimes int t; 2051556Srgrimes 206206145Sjilles /* This assumes the parser is not re-entered, 207206145Sjilles * which could happen if we add command substitution on PS1/PS2. 208206145Sjilles */ 209206145Sjilles parser_temp_free_all(); 210208656Sjilles heredoclist = NULL; 211206145Sjilles 21260593Scracauer tokpushback = 0; 2131556Srgrimes doprompt = interact; 2141556Srgrimes if (doprompt) 2151556Srgrimes setprompt(1); 2161556Srgrimes else 2171556Srgrimes setprompt(0); 2181556Srgrimes needprompt = 0; 2191556Srgrimes t = readtoken(); 2201556Srgrimes if (t == TEOF) 2211556Srgrimes return NEOF; 2221556Srgrimes if (t == TNL) 2231556Srgrimes return NULL; 2241556Srgrimes tokpushback++; 225214531Sjilles return list(1, 1); 2261556Srgrimes} 2271556Srgrimes 2281556Srgrimes 229213811Sobrienstatic union node * 230214525Sjilleslist(int nlflag, int erflag) 23117987Speter{ 232214599Sjilles union node *ntop, *n1, *n2, *n3; 23317987Speter int tok; 2341556Srgrimes 235214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 236214531Sjilles if (!nlflag && !erflag && tokendlist[peektoken()]) 2371556Srgrimes return NULL; 238214599Sjilles ntop = n1 = NULL; 2391556Srgrimes for (;;) { 24017987Speter n2 = andor(); 24117987Speter tok = readtoken(); 24217987Speter if (tok == TBACKGND) { 24317987Speter if (n2->type == NCMD || n2->type == NPIPE) { 24417987Speter n2->ncmd.backgnd = 1; 24517987Speter } else if (n2->type == NREDIR) { 24617987Speter n2->type = NBACKGND; 24717987Speter } else { 24817987Speter n3 = (union node *)stalloc(sizeof (struct nredir)); 24917987Speter n3->type = NBACKGND; 25017987Speter n3->nredir.n = n2; 25117987Speter n3->nredir.redirect = NULL; 25217987Speter n2 = n3; 25317987Speter } 25417987Speter } 255214599Sjilles if (ntop == NULL) 256214599Sjilles ntop = n2; 257214599Sjilles else if (n1 == NULL) { 258214599Sjilles n1 = (union node *)stalloc(sizeof (struct nbinary)); 259214599Sjilles n1->type = NSEMI; 260214599Sjilles n1->nbinary.ch1 = ntop; 261214599Sjilles n1->nbinary.ch2 = n2; 262214599Sjilles ntop = n1; 26317987Speter } 26417987Speter else { 26517987Speter n3 = (union node *)stalloc(sizeof (struct nbinary)); 26617987Speter n3->type = NSEMI; 267214599Sjilles n3->nbinary.ch1 = n1->nbinary.ch2; 26817987Speter n3->nbinary.ch2 = n2; 269214599Sjilles n1->nbinary.ch2 = n3; 27017987Speter n1 = n3; 27117987Speter } 27217987Speter switch (tok) { 27313882Sjoerg case TBACKGND: 27417987Speter case TSEMI: 27517987Speter tok = readtoken(); 276102410Scharnier /* FALLTHROUGH */ 2771556Srgrimes case TNL: 27817987Speter if (tok == TNL) { 27917987Speter parseheredoc(); 28017987Speter if (nlflag) 281214599Sjilles return ntop; 282210488Sjilles } else if (tok == TEOF && nlflag) { 283210488Sjilles parseheredoc(); 284214599Sjilles return ntop; 28517987Speter } else { 28617987Speter tokpushback++; 28717987Speter } 288214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 289214531Sjilles if (!nlflag && !erflag && tokendlist[peektoken()]) 290214599Sjilles return ntop; 2911556Srgrimes break; 2921556Srgrimes case TEOF: 2931556Srgrimes if (heredoclist) 2941556Srgrimes parseheredoc(); 2951556Srgrimes else 2961556Srgrimes pungetc(); /* push back EOF on input */ 297214599Sjilles return ntop; 2981556Srgrimes default: 299214525Sjilles if (nlflag || erflag) 3001556Srgrimes synexpect(-1); 3011556Srgrimes tokpushback++; 302214599Sjilles return ntop; 3031556Srgrimes } 3041556Srgrimes } 3051556Srgrimes} 3061556Srgrimes 3071556Srgrimes 3081556Srgrimes 309213811Sobrienstatic union node * 31090111Simpandor(void) 31190111Simp{ 3121556Srgrimes union node *n1, *n2, *n3; 3131556Srgrimes int t; 3141556Srgrimes 3151556Srgrimes n1 = pipeline(); 3161556Srgrimes for (;;) { 3171556Srgrimes if ((t = readtoken()) == TAND) { 3181556Srgrimes t = NAND; 3191556Srgrimes } else if (t == TOR) { 3201556Srgrimes t = NOR; 3211556Srgrimes } else { 3221556Srgrimes tokpushback++; 3231556Srgrimes return n1; 3241556Srgrimes } 3251556Srgrimes n2 = pipeline(); 3261556Srgrimes n3 = (union node *)stalloc(sizeof (struct nbinary)); 3271556Srgrimes n3->type = t; 3281556Srgrimes n3->nbinary.ch1 = n1; 3291556Srgrimes n3->nbinary.ch2 = n2; 3301556Srgrimes n1 = n3; 3311556Srgrimes } 3321556Srgrimes} 3331556Srgrimes 3341556Srgrimes 3351556Srgrimes 336213811Sobrienstatic union node * 33790111Simppipeline(void) 33890111Simp{ 33975336Sbrian union node *n1, *n2, *pipenode; 3401556Srgrimes struct nodelist *lp, *prev; 341214281Sjilles int negate, t; 3421556Srgrimes 34375336Sbrian negate = 0; 344214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 3451556Srgrimes TRACE(("pipeline: entered\n")); 34675336Sbrian while (readtoken() == TNOT) 34775336Sbrian negate = !negate; 34875336Sbrian tokpushback++; 3491556Srgrimes n1 = command(); 3501556Srgrimes if (readtoken() == TPIPE) { 3511556Srgrimes pipenode = (union node *)stalloc(sizeof (struct npipe)); 3521556Srgrimes pipenode->type = NPIPE; 3531556Srgrimes pipenode->npipe.backgnd = 0; 3541556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 3551556Srgrimes pipenode->npipe.cmdlist = lp; 3561556Srgrimes lp->n = n1; 3571556Srgrimes do { 3581556Srgrimes prev = lp; 3591556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 360214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 361214281Sjilles t = readtoken(); 362214281Sjilles tokpushback++; 363214281Sjilles if (t == TNOT) 364214281Sjilles lp->n = pipeline(); 365214281Sjilles else 366214281Sjilles lp->n = command(); 3671556Srgrimes prev->next = lp; 3681556Srgrimes } while (readtoken() == TPIPE); 3691556Srgrimes lp->next = NULL; 3701556Srgrimes n1 = pipenode; 3711556Srgrimes } 3721556Srgrimes tokpushback++; 37375336Sbrian if (negate) { 37475336Sbrian n2 = (union node *)stalloc(sizeof (struct nnot)); 37575336Sbrian n2->type = NNOT; 37675336Sbrian n2->nnot.com = n1; 37775336Sbrian return n2; 37875336Sbrian } else 37975336Sbrian return n1; 3801556Srgrimes} 3811556Srgrimes 3821556Srgrimes 3831556Srgrimes 384213811Sobrienstatic union node * 38590111Simpcommand(void) 38690111Simp{ 3871556Srgrimes union node *n1, *n2; 3881556Srgrimes union node *ap, **app; 3891556Srgrimes union node *cp, **cpp; 3901556Srgrimes union node *redir, **rpp; 391214281Sjilles int t; 392218325Sjilles int is_subshell; 3931556Srgrimes 394214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 395218325Sjilles is_subshell = 0; 39617987Speter redir = NULL; 39717987Speter n1 = NULL; 3981556Srgrimes rpp = &redir; 39920425Ssteve 4001556Srgrimes /* Check for redirection which may precede command */ 4011556Srgrimes while (readtoken() == TREDIR) { 4021556Srgrimes *rpp = n2 = redirnode; 4031556Srgrimes rpp = &n2->nfile.next; 4041556Srgrimes parsefname(); 4051556Srgrimes } 4061556Srgrimes tokpushback++; 4071556Srgrimes 4081556Srgrimes switch (readtoken()) { 4091556Srgrimes case TIF: 4101556Srgrimes n1 = (union node *)stalloc(sizeof (struct nif)); 4111556Srgrimes n1->type = NIF; 412214525Sjilles if ((n1->nif.test = list(0, 0)) == NULL) 413104554Stjr synexpect(-1); 4141556Srgrimes if (readtoken() != TTHEN) 4151556Srgrimes synexpect(TTHEN); 416214525Sjilles n1->nif.ifpart = list(0, 0); 4171556Srgrimes n2 = n1; 4181556Srgrimes while (readtoken() == TELIF) { 4191556Srgrimes n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 4201556Srgrimes n2 = n2->nif.elsepart; 4211556Srgrimes n2->type = NIF; 422214525Sjilles if ((n2->nif.test = list(0, 0)) == NULL) 423104554Stjr synexpect(-1); 4241556Srgrimes if (readtoken() != TTHEN) 4251556Srgrimes synexpect(TTHEN); 426214525Sjilles n2->nif.ifpart = list(0, 0); 4271556Srgrimes } 4281556Srgrimes if (lasttoken == TELSE) 429214525Sjilles n2->nif.elsepart = list(0, 0); 4301556Srgrimes else { 4311556Srgrimes n2->nif.elsepart = NULL; 4321556Srgrimes tokpushback++; 4331556Srgrimes } 4341556Srgrimes if (readtoken() != TFI) 4351556Srgrimes synexpect(TFI); 436214709Sjilles checkkwd = CHKKWD | CHKALIAS; 4371556Srgrimes break; 4381556Srgrimes case TWHILE: 4391556Srgrimes case TUNTIL: { 4401556Srgrimes int got; 4411556Srgrimes n1 = (union node *)stalloc(sizeof (struct nbinary)); 4421556Srgrimes n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 443214525Sjilles if ((n1->nbinary.ch1 = list(0, 0)) == NULL) 444104554Stjr synexpect(-1); 4451556Srgrimes if ((got=readtoken()) != TDO) { 4461556SrgrimesTRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 4471556Srgrimes synexpect(TDO); 4481556Srgrimes } 449214525Sjilles n1->nbinary.ch2 = list(0, 0); 4501556Srgrimes if (readtoken() != TDONE) 4511556Srgrimes synexpect(TDONE); 452214709Sjilles checkkwd = CHKKWD | CHKALIAS; 4531556Srgrimes break; 4541556Srgrimes } 4551556Srgrimes case TFOR: 4561556Srgrimes if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 4571556Srgrimes synerror("Bad for loop variable"); 4581556Srgrimes n1 = (union node *)stalloc(sizeof (struct nfor)); 4591556Srgrimes n1->type = NFOR; 4601556Srgrimes n1->nfor.var = wordtext; 461199282Sjilles while (readtoken() == TNL) 462199282Sjilles ; 463199282Sjilles if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) { 4641556Srgrimes app = ≈ 4651556Srgrimes while (readtoken() == TWORD) { 4661556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 4671556Srgrimes n2->type = NARG; 4681556Srgrimes n2->narg.text = wordtext; 4691556Srgrimes n2->narg.backquote = backquotelist; 4701556Srgrimes *app = n2; 4711556Srgrimes app = &n2->narg.next; 4721556Srgrimes } 4731556Srgrimes *app = NULL; 4741556Srgrimes n1->nfor.args = ap; 4751556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 4761556Srgrimes synexpect(-1); 4771556Srgrimes } else { 478149096Sstefanf static char argvars[5] = { 479149096Sstefanf CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' 480149096Sstefanf }; 4811556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 4821556Srgrimes n2->type = NARG; 483149096Sstefanf n2->narg.text = argvars; 4841556Srgrimes n2->narg.backquote = NULL; 4851556Srgrimes n2->narg.next = NULL; 4861556Srgrimes n1->nfor.args = n2; 4871556Srgrimes /* 4881556Srgrimes * Newline or semicolon here is optional (but note 4891556Srgrimes * that the original Bourne shell only allowed NL). 4901556Srgrimes */ 4911556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 4921556Srgrimes tokpushback++; 4931556Srgrimes } 494214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 4951556Srgrimes if ((t = readtoken()) == TDO) 4961556Srgrimes t = TDONE; 4971556Srgrimes else if (t == TBEGIN) 4981556Srgrimes t = TEND; 4991556Srgrimes else 5001556Srgrimes synexpect(-1); 501214525Sjilles n1->nfor.body = list(0, 0); 5021556Srgrimes if (readtoken() != t) 5031556Srgrimes synexpect(t); 504214709Sjilles checkkwd = CHKKWD | CHKALIAS; 5051556Srgrimes break; 5061556Srgrimes case TCASE: 5071556Srgrimes n1 = (union node *)stalloc(sizeof (struct ncase)); 5081556Srgrimes n1->type = NCASE; 5091556Srgrimes if (readtoken() != TWORD) 5101556Srgrimes synexpect(TWORD); 5111556Srgrimes n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 5121556Srgrimes n2->type = NARG; 5131556Srgrimes n2->narg.text = wordtext; 5141556Srgrimes n2->narg.backquote = backquotelist; 5151556Srgrimes n2->narg.next = NULL; 5161556Srgrimes while (readtoken() == TNL); 5171556Srgrimes if (lasttoken != TWORD || ! equal(wordtext, "in")) 5181556Srgrimes synerror("expecting \"in\""); 5191556Srgrimes cpp = &n1->ncase.cases; 520214709Sjilles checkkwd = CHKNL | CHKKWD, readtoken(); 521104202Stjr while (lasttoken != TESAC) { 5221556Srgrimes *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 5231556Srgrimes cp->type = NCLIST; 5241556Srgrimes app = &cp->nclist.pattern; 525104207Stjr if (lasttoken == TLP) 526104207Stjr readtoken(); 5271556Srgrimes for (;;) { 5281556Srgrimes *app = ap = (union node *)stalloc(sizeof (struct narg)); 5291556Srgrimes ap->type = NARG; 5301556Srgrimes ap->narg.text = wordtext; 5311556Srgrimes ap->narg.backquote = backquotelist; 532214709Sjilles checkkwd = CHKNL | CHKKWD; 533214709Sjilles if (readtoken() != TPIPE) 5341556Srgrimes break; 5351556Srgrimes app = &ap->narg.next; 5362760Ssef readtoken(); 5371556Srgrimes } 5381556Srgrimes ap->narg.next = NULL; 5391556Srgrimes if (lasttoken != TRP) 540214709Sjilles synexpect(TRP); 541214525Sjilles cp->nclist.body = list(0, 0); 5422760Ssef 543214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 5442760Ssef if ((t = readtoken()) != TESAC) { 5452760Ssef if (t != TENDCASE) 546214709Sjilles synexpect(TENDCASE); 5472760Ssef else 548214709Sjilles checkkwd = CHKNL | CHKKWD, readtoken(); 5492760Ssef } 5501556Srgrimes cpp = &cp->nclist.next; 551104202Stjr } 5521556Srgrimes *cpp = NULL; 553214709Sjilles checkkwd = CHKKWD | CHKALIAS; 5541556Srgrimes break; 5551556Srgrimes case TLP: 5561556Srgrimes n1 = (union node *)stalloc(sizeof (struct nredir)); 5571556Srgrimes n1->type = NSUBSHELL; 558214525Sjilles n1->nredir.n = list(0, 0); 5591556Srgrimes n1->nredir.redirect = NULL; 5601556Srgrimes if (readtoken() != TRP) 5611556Srgrimes synexpect(TRP); 562214709Sjilles checkkwd = CHKKWD | CHKALIAS; 563218325Sjilles is_subshell = 1; 5641556Srgrimes break; 5651556Srgrimes case TBEGIN: 566214525Sjilles n1 = list(0, 0); 5671556Srgrimes if (readtoken() != TEND) 5681556Srgrimes synexpect(TEND); 569214709Sjilles checkkwd = CHKKWD | CHKALIAS; 5701556Srgrimes break; 5711556Srgrimes /* Handle an empty command like other simple commands. */ 572210221Sjilles case TBACKGND: 57317987Speter case TSEMI: 574101662Stjr case TAND: 575101662Stjr case TOR: 57617987Speter /* 57717987Speter * An empty command before a ; doesn't make much sense, and 57817987Speter * should certainly be disallowed in the case of `if ;'. 57917987Speter */ 58017987Speter if (!redir) 58117987Speter synexpect(-1); 5821556Srgrimes case TNL: 58310399Sjoerg case TEOF: 5841556Srgrimes case TWORD: 58517987Speter case TRP: 5861556Srgrimes tokpushback++; 58775160Sbrian n1 = simplecmd(rpp, redir); 588214281Sjilles return n1; 5891556Srgrimes default: 5901556Srgrimes synexpect(-1); 5911556Srgrimes } 5921556Srgrimes 5931556Srgrimes /* Now check for redirection which may follow command */ 5941556Srgrimes while (readtoken() == TREDIR) { 5951556Srgrimes *rpp = n2 = redirnode; 5961556Srgrimes rpp = &n2->nfile.next; 5971556Srgrimes parsefname(); 5981556Srgrimes } 5991556Srgrimes tokpushback++; 6001556Srgrimes *rpp = NULL; 6011556Srgrimes if (redir) { 602218325Sjilles if (!is_subshell) { 6031556Srgrimes n2 = (union node *)stalloc(sizeof (struct nredir)); 6041556Srgrimes n2->type = NREDIR; 6051556Srgrimes n2->nredir.n = n1; 6061556Srgrimes n1 = n2; 6071556Srgrimes } 6081556Srgrimes n1->nredir.redirect = redir; 6091556Srgrimes } 61075160Sbrian 611214281Sjilles return n1; 6121556Srgrimes} 6131556Srgrimes 6141556Srgrimes 615213811Sobrienstatic union node * 61690111Simpsimplecmd(union node **rpp, union node *redir) 61790111Simp{ 6181556Srgrimes union node *args, **app; 6191556Srgrimes union node **orig_rpp = rpp; 620210087Sjilles union node *n = NULL; 621214304Sjilles int special; 622222165Sjilles int savecheckkwd; 6231556Srgrimes 6241556Srgrimes /* If we don't have any redirections already, then we must reset */ 6251556Srgrimes /* rpp to be the address of the local redir variable. */ 6261556Srgrimes if (redir == 0) 6271556Srgrimes rpp = &redir; 6281556Srgrimes 6291556Srgrimes args = NULL; 6301556Srgrimes app = &args; 6318855Srgrimes /* 6321556Srgrimes * We save the incoming value, because we need this for shell 6331556Srgrimes * functions. There can not be a redirect or an argument between 6348855Srgrimes * the function name and the open parenthesis. 6351556Srgrimes */ 6361556Srgrimes orig_rpp = rpp; 6371556Srgrimes 638222165Sjilles savecheckkwd = CHKALIAS; 639222165Sjilles 6401556Srgrimes for (;;) { 641222165Sjilles checkkwd = savecheckkwd; 6421556Srgrimes if (readtoken() == TWORD) { 6431556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 6441556Srgrimes n->type = NARG; 6451556Srgrimes n->narg.text = wordtext; 6461556Srgrimes n->narg.backquote = backquotelist; 6471556Srgrimes *app = n; 6481556Srgrimes app = &n->narg.next; 649222165Sjilles if (savecheckkwd != 0 && !isassignment(wordtext)) 650222165Sjilles savecheckkwd = 0; 6511556Srgrimes } else if (lasttoken == TREDIR) { 6521556Srgrimes *rpp = n = redirnode; 6531556Srgrimes rpp = &n->nfile.next; 6541556Srgrimes parsefname(); /* read name of redirection file */ 6551556Srgrimes } else if (lasttoken == TLP && app == &args->narg.next 6561556Srgrimes && rpp == orig_rpp) { 6571556Srgrimes /* We have a function */ 6581556Srgrimes if (readtoken() != TRP) 6591556Srgrimes synexpect(TRP); 660179022Sstefanf funclinno = plinno; 661214291Sjilles /* 662214291Sjilles * - Require plain text. 663214291Sjilles * - Functions with '/' cannot be called. 664214534Sjilles * - Reject name=(). 665214534Sjilles * - Reject ksh extended glob patterns. 666214291Sjilles */ 667214291Sjilles if (!noexpand(n->narg.text) || quoteflag || 668214534Sjilles strchr(n->narg.text, '/') || 669214534Sjilles strchr("!%*+-=?@}~", 670214534Sjilles n->narg.text[strlen(n->narg.text) - 1])) 6711556Srgrimes synerror("Bad function name"); 672214291Sjilles rmescapes(n->narg.text); 673214304Sjilles if (find_builtin(n->narg.text, &special) >= 0 && 674214304Sjilles special) 675214304Sjilles synerror("Cannot override a special builtin with a function"); 6761556Srgrimes n->type = NDEFUN; 6771556Srgrimes n->narg.next = command(); 678179022Sstefanf funclinno = 0; 679210087Sjilles return n; 6801556Srgrimes } else { 6811556Srgrimes tokpushback++; 6821556Srgrimes break; 6831556Srgrimes } 6841556Srgrimes } 6851556Srgrimes *app = NULL; 6861556Srgrimes *rpp = NULL; 6871556Srgrimes n = (union node *)stalloc(sizeof (struct ncmd)); 6881556Srgrimes n->type = NCMD; 6891556Srgrimes n->ncmd.backgnd = 0; 6901556Srgrimes n->ncmd.args = args; 6911556Srgrimes n->ncmd.redirect = redir; 692210087Sjilles return n; 6931556Srgrimes} 6941556Srgrimes 695213811Sobrienstatic union node * 69690111Simpmakename(void) 69790111Simp{ 69817987Speter union node *n; 6991556Srgrimes 70017987Speter n = (union node *)stalloc(sizeof (struct narg)); 70117987Speter n->type = NARG; 70217987Speter n->narg.next = NULL; 70317987Speter n->narg.text = wordtext; 70417987Speter n->narg.backquote = backquotelist; 70517987Speter return n; 70617987Speter} 70717987Speter 708213760Sobrienvoid 709213760Sobrienfixredir(union node *n, const char *text, int err) 71090111Simp{ 71117987Speter TRACE(("Fix redir %s %d\n", text, err)); 71217987Speter if (!err) 71317987Speter n->ndup.vname = NULL; 71417987Speter 71517987Speter if (is_digit(text[0]) && text[1] == '\0') 71617987Speter n->ndup.dupfd = digit_val(text[0]); 71717987Speter else if (text[0] == '-' && text[1] == '\0') 71817987Speter n->ndup.dupfd = -1; 71917987Speter else { 72020425Ssteve 72117987Speter if (err) 72217987Speter synerror("Bad fd number"); 72317987Speter else 72417987Speter n->ndup.vname = makename(); 72517987Speter } 72617987Speter} 72717987Speter 72817987Speter 729213811Sobrienstatic void 73090111Simpparsefname(void) 73190111Simp{ 7321556Srgrimes union node *n = redirnode; 7331556Srgrimes 7341556Srgrimes if (readtoken() != TWORD) 7351556Srgrimes synexpect(-1); 7361556Srgrimes if (n->type == NHERE) { 7371556Srgrimes struct heredoc *here = heredoc; 7381556Srgrimes struct heredoc *p; 7391556Srgrimes int i; 7401556Srgrimes 7411556Srgrimes if (quoteflag == 0) 7421556Srgrimes n->type = NXHERE; 7431556Srgrimes TRACE(("Here document %d\n", n->type)); 7441556Srgrimes if (here->striptabs) { 7451556Srgrimes while (*wordtext == '\t') 7461556Srgrimes wordtext++; 7471556Srgrimes } 7481556Srgrimes if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 7491556Srgrimes synerror("Illegal eof marker for << redirection"); 7501556Srgrimes rmescapes(wordtext); 7511556Srgrimes here->eofmark = wordtext; 7521556Srgrimes here->next = NULL; 7531556Srgrimes if (heredoclist == NULL) 7541556Srgrimes heredoclist = here; 7551556Srgrimes else { 7561556Srgrimes for (p = heredoclist ; p->next ; p = p->next); 7571556Srgrimes p->next = here; 7581556Srgrimes } 7591556Srgrimes } else if (n->type == NTOFD || n->type == NFROMFD) { 76017987Speter fixredir(n, wordtext, 0); 7611556Srgrimes } else { 76217987Speter n->nfile.fname = makename(); 7631556Srgrimes } 7641556Srgrimes} 7651556Srgrimes 7661556Srgrimes 7671556Srgrimes/* 7681556Srgrimes * Input any here documents. 7691556Srgrimes */ 7701556Srgrimes 771213811Sobrienstatic void 77290111Simpparseheredoc(void) 77390111Simp{ 7741556Srgrimes struct heredoc *here; 7751556Srgrimes union node *n; 7761556Srgrimes 7771556Srgrimes while (heredoclist) { 7781556Srgrimes here = heredoclist; 7791556Srgrimes heredoclist = here->next; 7801556Srgrimes if (needprompt) { 7811556Srgrimes setprompt(2); 7821556Srgrimes needprompt = 0; 7831556Srgrimes } 7841556Srgrimes readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 7851556Srgrimes here->eofmark, here->striptabs); 7861556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 7871556Srgrimes n->narg.type = NARG; 7881556Srgrimes n->narg.next = NULL; 7891556Srgrimes n->narg.text = wordtext; 7901556Srgrimes n->narg.backquote = backquotelist; 7911556Srgrimes here->here->nhere.doc = n; 7921556Srgrimes } 7931556Srgrimes} 7941556Srgrimes 795213811Sobrienstatic int 79690111Simppeektoken(void) 79790111Simp{ 7981556Srgrimes int t; 7991556Srgrimes 8001556Srgrimes t = readtoken(); 8011556Srgrimes tokpushback++; 8021556Srgrimes return (t); 8031556Srgrimes} 8041556Srgrimes 805213811Sobrienstatic int 80690111Simpreadtoken(void) 80790111Simp{ 8081556Srgrimes int t; 8091556Srgrimes struct alias *ap; 8101556Srgrimes#ifdef DEBUG 8111556Srgrimes int alreadyseen = tokpushback; 8121556Srgrimes#endif 8138855Srgrimes 8141556Srgrimes top: 8151556Srgrimes t = xxreadtoken(); 8161556Srgrimes 817214709Sjilles /* 818214709Sjilles * eat newlines 819214709Sjilles */ 820214709Sjilles if (checkkwd & CHKNL) { 821214709Sjilles while (t == TNL) { 822214709Sjilles parseheredoc(); 823214709Sjilles t = xxreadtoken(); 824214709Sjilles } 825214709Sjilles } 8261556Srgrimes 827214709Sjilles /* 828214709Sjilles * check for keywords and aliases 829214709Sjilles */ 830214709Sjilles if (t == TWORD && !quoteflag) 831214709Sjilles { 832214709Sjilles const char * const *pp; 833214709Sjilles 834214709Sjilles if (checkkwd & CHKKWD) 83598463Sjmallett for (pp = parsekwd; *pp; pp++) { 83620425Ssteve if (**pp == *wordtext && equal(*pp, wordtext)) 83717987Speter { 8381556Srgrimes lasttoken = t = pp - parsekwd + KWDOFFSET; 8391556Srgrimes TRACE(("keyword %s recognized\n", tokname[t])); 8401556Srgrimes goto out; 8411556Srgrimes } 8421556Srgrimes } 843214709Sjilles if (checkkwd & CHKALIAS && 844214709Sjilles (ap = lookupalias(wordtext, 1)) != NULL) { 845214709Sjilles pushstring(ap->val, strlen(ap->val), ap); 846214709Sjilles goto top; 8471556Srgrimes } 848214709Sjilles } 8491556Srgrimesout: 850214709Sjilles if (t != TNOT) 851214709Sjilles checkkwd = 0; 852214709Sjilles 8531556Srgrimes#ifdef DEBUG 8541556Srgrimes if (!alreadyseen) 8551556Srgrimes TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 8561556Srgrimes else 8571556Srgrimes TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 8581556Srgrimes#endif 8591556Srgrimes return (t); 8601556Srgrimes} 8611556Srgrimes 8621556Srgrimes 8631556Srgrimes/* 8641556Srgrimes * Read the next input token. 8651556Srgrimes * If the token is a word, we set backquotelist to the list of cmds in 8661556Srgrimes * backquotes. We set quoteflag to true if any part of the word was 8671556Srgrimes * quoted. 8681556Srgrimes * If the token is TREDIR, then we set redirnode to a structure containing 8691556Srgrimes * the redirection. 8701556Srgrimes * In all cases, the variable startlinno is set to the number of the line 8711556Srgrimes * on which the token starts. 8721556Srgrimes * 8731556Srgrimes * [Change comment: here documents and internal procedures] 8741556Srgrimes * [Readtoken shouldn't have any arguments. Perhaps we should make the 8751556Srgrimes * word parsing code into a separate routine. In this case, readtoken 8761556Srgrimes * doesn't need to have any internal procedures, but parseword does. 8771556Srgrimes * We could also make parseoperator in essence the main routine, and 8781556Srgrimes * have parseword (readtoken1?) handle both words and redirection.] 8791556Srgrimes */ 8801556Srgrimes 8811556Srgrimes#define RETURN(token) return lasttoken = token 8821556Srgrimes 883213811Sobrienstatic int 88490111Simpxxreadtoken(void) 88590111Simp{ 88625230Ssteve int c; 8871556Srgrimes 8881556Srgrimes if (tokpushback) { 8891556Srgrimes tokpushback = 0; 8901556Srgrimes return lasttoken; 8911556Srgrimes } 8921556Srgrimes if (needprompt) { 8931556Srgrimes setprompt(2); 8941556Srgrimes needprompt = 0; 8951556Srgrimes } 8961556Srgrimes startlinno = plinno; 8971556Srgrimes for (;;) { /* until token or start of word found */ 8981556Srgrimes c = pgetc_macro(); 8991556Srgrimes switch (c) { 9001556Srgrimes case ' ': case '\t': 9011556Srgrimes continue; 9021556Srgrimes case '#': 9031556Srgrimes while ((c = pgetc()) != '\n' && c != PEOF); 9041556Srgrimes pungetc(); 9051556Srgrimes continue; 9061556Srgrimes case '\\': 9071556Srgrimes if (pgetc() == '\n') { 9081556Srgrimes startlinno = ++plinno; 9091556Srgrimes if (doprompt) 9101556Srgrimes setprompt(2); 9111556Srgrimes else 9121556Srgrimes setprompt(0); 9131556Srgrimes continue; 9141556Srgrimes } 9151556Srgrimes pungetc(); 9161556Srgrimes goto breakloop; 9171556Srgrimes case '\n': 9181556Srgrimes plinno++; 9191556Srgrimes needprompt = doprompt; 9201556Srgrimes RETURN(TNL); 9211556Srgrimes case PEOF: 9221556Srgrimes RETURN(TEOF); 9231556Srgrimes case '&': 9241556Srgrimes if (pgetc() == '&') 9251556Srgrimes RETURN(TAND); 9261556Srgrimes pungetc(); 9271556Srgrimes RETURN(TBACKGND); 9281556Srgrimes case '|': 9291556Srgrimes if (pgetc() == '|') 9301556Srgrimes RETURN(TOR); 9311556Srgrimes pungetc(); 9321556Srgrimes RETURN(TPIPE); 9331556Srgrimes case ';': 9341556Srgrimes if (pgetc() == ';') 9351556Srgrimes RETURN(TENDCASE); 9361556Srgrimes pungetc(); 9371556Srgrimes RETURN(TSEMI); 9381556Srgrimes case '(': 9391556Srgrimes RETURN(TLP); 9401556Srgrimes case ')': 9411556Srgrimes RETURN(TRP); 9421556Srgrimes default: 9431556Srgrimes goto breakloop; 9441556Srgrimes } 9451556Srgrimes } 9461556Srgrimesbreakloop: 9471556Srgrimes return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 9481556Srgrimes#undef RETURN 9491556Srgrimes} 9501556Srgrimes 9511556Srgrimes 952213811Sobrien#define MAXNEST_static 8 953206145Sjillesstruct tokenstate 954206145Sjilles{ 955206145Sjilles const char *syntax; /* *SYNTAX */ 956206145Sjilles int parenlevel; /* levels of parentheses in arithmetic */ 957206145Sjilles enum tokenstate_category 958206145Sjilles { 959206145Sjilles TSTATE_TOP, 960206145Sjilles TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */ 961206145Sjilles TSTATE_VAR_NEW, /* other ${var...}, own dquote state */ 962206145Sjilles TSTATE_ARITH 963206145Sjilles } category; 964206145Sjilles}; 965206145Sjilles 966206145Sjilles 967205130Sjilles/* 968205130Sjilles * Called to parse command substitutions. 969205130Sjilles */ 9701556Srgrimes 971213811Sobrienstatic char * 972205130Sjillesparsebackq(char *out, struct nodelist **pbqlist, 973205130Sjilles int oldstyle, int dblquote, int quoted) 974205130Sjilles{ 975205130Sjilles struct nodelist **nlpp; 976205130Sjilles union node *n; 977205130Sjilles char *volatile str; 978205130Sjilles struct jmploc jmploc; 979205130Sjilles struct jmploc *const savehandler = handler; 980205130Sjilles int savelen; 981205130Sjilles int saveprompt; 982205130Sjilles const int bq_startlinno = plinno; 983205130Sjilles char *volatile ostr = NULL; 984205130Sjilles struct parsefile *const savetopfile = getcurrentfile(); 985208655Sjilles struct heredoc *const saveheredoclist = heredoclist; 986208655Sjilles struct heredoc *here; 987205130Sjilles 988205130Sjilles str = NULL; 989205130Sjilles if (setjmp(jmploc.loc)) { 990205130Sjilles popfilesupto(savetopfile); 991205130Sjilles if (str) 992205130Sjilles ckfree(str); 993205130Sjilles if (ostr) 994205130Sjilles ckfree(ostr); 995208655Sjilles heredoclist = saveheredoclist; 996205130Sjilles handler = savehandler; 997205130Sjilles if (exception == EXERROR) { 998205130Sjilles startlinno = bq_startlinno; 999205130Sjilles synerror("Error in command substitution"); 1000205130Sjilles } 1001205130Sjilles longjmp(handler->loc, 1); 1002205130Sjilles } 1003205130Sjilles INTOFF; 1004205130Sjilles savelen = out - stackblock(); 1005205130Sjilles if (savelen > 0) { 1006205130Sjilles str = ckmalloc(savelen); 1007205130Sjilles memcpy(str, stackblock(), savelen); 1008205130Sjilles } 1009205130Sjilles handler = &jmploc; 1010208655Sjilles heredoclist = NULL; 1011205130Sjilles INTON; 1012205130Sjilles if (oldstyle) { 1013205130Sjilles /* We must read until the closing backquote, giving special 1014205130Sjilles treatment to some slashes, and then push the string and 1015205130Sjilles reread it as input, interpreting it normally. */ 1016205130Sjilles char *oout; 1017205130Sjilles int c; 1018205130Sjilles int olen; 1019205130Sjilles 1020205130Sjilles 1021205130Sjilles STARTSTACKSTR(oout); 1022205130Sjilles for (;;) { 1023205130Sjilles if (needprompt) { 1024205130Sjilles setprompt(2); 1025205130Sjilles needprompt = 0; 1026205130Sjilles } 1027215783Sjilles CHECKSTRSPACE(2, oout); 1028205130Sjilles switch (c = pgetc()) { 1029205130Sjilles case '`': 1030205130Sjilles goto done; 1031205130Sjilles 1032205130Sjilles case '\\': 1033205130Sjilles if ((c = pgetc()) == '\n') { 1034205130Sjilles plinno++; 1035205130Sjilles if (doprompt) 1036205130Sjilles setprompt(2); 1037205130Sjilles else 1038205130Sjilles setprompt(0); 1039205130Sjilles /* 1040205130Sjilles * If eating a newline, avoid putting 1041205130Sjilles * the newline into the new character 1042215783Sjilles * stream (via the USTPUTC after the 1043205130Sjilles * switch). 1044205130Sjilles */ 1045205130Sjilles continue; 1046205130Sjilles } 1047205130Sjilles if (c != '\\' && c != '`' && c != '$' 1048205130Sjilles && (!dblquote || c != '"')) 1049215783Sjilles USTPUTC('\\', oout); 1050205130Sjilles break; 1051205130Sjilles 1052205130Sjilles case '\n': 1053205130Sjilles plinno++; 1054205130Sjilles needprompt = doprompt; 1055205130Sjilles break; 1056205130Sjilles 1057205130Sjilles case PEOF: 1058205130Sjilles startlinno = plinno; 1059205130Sjilles synerror("EOF in backquote substitution"); 1060205130Sjilles break; 1061205130Sjilles 1062205130Sjilles default: 1063205130Sjilles break; 1064205130Sjilles } 1065215783Sjilles USTPUTC(c, oout); 1066205130Sjilles } 1067205130Sjillesdone: 1068215783Sjilles USTPUTC('\0', oout); 1069205130Sjilles olen = oout - stackblock(); 1070205130Sjilles INTOFF; 1071205130Sjilles ostr = ckmalloc(olen); 1072205130Sjilles memcpy(ostr, stackblock(), olen); 1073205130Sjilles setinputstring(ostr, 1); 1074205130Sjilles INTON; 1075205130Sjilles } 1076205130Sjilles nlpp = pbqlist; 1077205130Sjilles while (*nlpp) 1078205130Sjilles nlpp = &(*nlpp)->next; 1079205130Sjilles *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 1080205130Sjilles (*nlpp)->next = NULL; 1081205130Sjilles 1082205130Sjilles if (oldstyle) { 1083205130Sjilles saveprompt = doprompt; 1084205130Sjilles doprompt = 0; 1085205130Sjilles } 1086205130Sjilles 1087214525Sjilles n = list(0, oldstyle); 1088205130Sjilles 1089205130Sjilles if (oldstyle) 1090205130Sjilles doprompt = saveprompt; 1091205130Sjilles else { 1092205130Sjilles if (readtoken() != TRP) 1093205130Sjilles synexpect(TRP); 1094205130Sjilles } 1095205130Sjilles 1096205130Sjilles (*nlpp)->n = n; 1097205130Sjilles if (oldstyle) { 1098205130Sjilles /* 1099205130Sjilles * Start reading from old file again, ignoring any pushed back 1100205130Sjilles * tokens left from the backquote parsing 1101205130Sjilles */ 1102205130Sjilles popfile(); 1103205130Sjilles tokpushback = 0; 1104205130Sjilles } 1105205130Sjilles STARTSTACKSTR(out); 1106216706Sjilles CHECKSTRSPACE(savelen + 1, out); 1107208655Sjilles INTOFF; 1108205130Sjilles if (str) { 1109205130Sjilles memcpy(out, str, savelen); 1110205130Sjilles STADJUST(savelen, out); 1111205130Sjilles ckfree(str); 1112205130Sjilles str = NULL; 1113205130Sjilles } 1114205130Sjilles if (ostr) { 1115205130Sjilles ckfree(ostr); 1116205130Sjilles ostr = NULL; 1117205130Sjilles } 1118208655Sjilles here = saveheredoclist; 1119208655Sjilles if (here != NULL) { 1120208655Sjilles while (here->next != NULL) 1121208655Sjilles here = here->next; 1122208655Sjilles here->next = heredoclist; 1123208655Sjilles heredoclist = saveheredoclist; 1124208655Sjilles } 1125205130Sjilles handler = savehandler; 1126208655Sjilles INTON; 1127205130Sjilles if (quoted) 1128205130Sjilles USTPUTC(CTLBACKQ | CTLQUOTE, out); 1129205130Sjilles else 1130205130Sjilles USTPUTC(CTLBACKQ, out); 1131205130Sjilles return out; 1132205130Sjilles} 1133205130Sjilles 1134205130Sjilles 11351556Srgrimes/* 1136221513Sjilles * Called to parse a backslash escape sequence inside $'...'. 1137221513Sjilles * The backslash has already been read. 1138221513Sjilles */ 1139221513Sjillesstatic char * 1140221513Sjillesreadcstyleesc(char *out) 1141221513Sjilles{ 1142221513Sjilles int c, v, i, n; 1143221513Sjilles 1144221513Sjilles c = pgetc(); 1145221513Sjilles switch (c) { 1146221513Sjilles case '\0': 1147221513Sjilles synerror("Unterminated quoted string"); 1148221513Sjilles case '\n': 1149221513Sjilles plinno++; 1150221513Sjilles if (doprompt) 1151221513Sjilles setprompt(2); 1152221513Sjilles else 1153221513Sjilles setprompt(0); 1154221513Sjilles return out; 1155221513Sjilles case '\\': 1156221513Sjilles case '\'': 1157221513Sjilles case '"': 1158221513Sjilles v = c; 1159221513Sjilles break; 1160221513Sjilles case 'a': v = '\a'; break; 1161221513Sjilles case 'b': v = '\b'; break; 1162221513Sjilles case 'e': v = '\033'; break; 1163221513Sjilles case 'f': v = '\f'; break; 1164221513Sjilles case 'n': v = '\n'; break; 1165221513Sjilles case 'r': v = '\r'; break; 1166221513Sjilles case 't': v = '\t'; break; 1167221513Sjilles case 'v': v = '\v'; break; 1168221513Sjilles case 'x': 1169221513Sjilles v = 0; 1170221513Sjilles for (;;) { 1171221513Sjilles c = pgetc(); 1172221513Sjilles if (c >= '0' && c <= '9') 1173221513Sjilles v = (v << 4) + c - '0'; 1174221513Sjilles else if (c >= 'A' && c <= 'F') 1175221513Sjilles v = (v << 4) + c - 'A' + 10; 1176221513Sjilles else if (c >= 'a' && c <= 'f') 1177221513Sjilles v = (v << 4) + c - 'a' + 10; 1178221513Sjilles else 1179221513Sjilles break; 1180221513Sjilles } 1181221513Sjilles pungetc(); 1182221513Sjilles break; 1183221513Sjilles case '0': case '1': case '2': case '3': 1184221513Sjilles case '4': case '5': case '6': case '7': 1185221513Sjilles v = c - '0'; 1186221513Sjilles c = pgetc(); 1187221513Sjilles if (c >= '0' && c <= '7') { 1188221513Sjilles v <<= 3; 1189221513Sjilles v += c - '0'; 1190221513Sjilles c = pgetc(); 1191221513Sjilles if (c >= '0' && c <= '7') { 1192221513Sjilles v <<= 3; 1193221513Sjilles v += c - '0'; 1194221513Sjilles } else 1195221513Sjilles pungetc(); 1196221513Sjilles } else 1197221513Sjilles pungetc(); 1198221513Sjilles break; 1199221513Sjilles case 'c': 1200221513Sjilles c = pgetc(); 1201221513Sjilles if (c < 0x3f || c > 0x7a || c == 0x60) 1202221513Sjilles synerror("Bad escape sequence"); 1203221513Sjilles if (c == '\\' && pgetc() != '\\') 1204221513Sjilles synerror("Bad escape sequence"); 1205221513Sjilles if (c == '?') 1206221513Sjilles v = 127; 1207221513Sjilles else 1208221513Sjilles v = c & 0x1f; 1209221513Sjilles break; 1210221513Sjilles case 'u': 1211221513Sjilles case 'U': 1212221513Sjilles n = c == 'U' ? 8 : 4; 1213221513Sjilles v = 0; 1214221513Sjilles for (i = 0; i < n; i++) { 1215221513Sjilles c = pgetc(); 1216221513Sjilles if (c >= '0' && c <= '9') 1217221513Sjilles v = (v << 4) + c - '0'; 1218221513Sjilles else if (c >= 'A' && c <= 'F') 1219221513Sjilles v = (v << 4) + c - 'A' + 10; 1220221513Sjilles else if (c >= 'a' && c <= 'f') 1221221513Sjilles v = (v << 4) + c - 'a' + 10; 1222221513Sjilles else 1223221513Sjilles synerror("Bad escape sequence"); 1224221513Sjilles } 1225221513Sjilles if (v == 0 || (v >= 0xd800 && v <= 0xdfff)) 1226221513Sjilles synerror("Bad escape sequence"); 1227221513Sjilles /* We really need iconv here. */ 1228221669Sjilles if (initial_localeisutf8 && v > 127) { 1229221669Sjilles CHECKSTRSPACE(4, out); 1230221669Sjilles /* 1231221669Sjilles * We cannot use wctomb() as the locale may have 1232221669Sjilles * changed. 1233221669Sjilles */ 1234221669Sjilles if (v <= 0x7ff) { 1235221669Sjilles USTPUTC(0xc0 | v >> 6, out); 1236221669Sjilles USTPUTC(0x80 | (v & 0x3f), out); 1237221669Sjilles return out; 1238221669Sjilles } else if (v <= 0xffff) { 1239221669Sjilles USTPUTC(0xe0 | v >> 12, out); 1240221669Sjilles USTPUTC(0x80 | ((v >> 6) & 0x3f), out); 1241221669Sjilles USTPUTC(0x80 | (v & 0x3f), out); 1242221669Sjilles return out; 1243221669Sjilles } else if (v <= 0x10ffff) { 1244221669Sjilles USTPUTC(0xf0 | v >> 18, out); 1245221669Sjilles USTPUTC(0x80 | ((v >> 12) & 0x3f), out); 1246221669Sjilles USTPUTC(0x80 | ((v >> 6) & 0x3f), out); 1247221669Sjilles USTPUTC(0x80 | (v & 0x3f), out); 1248221669Sjilles return out; 1249221669Sjilles } 1250221669Sjilles } 1251221513Sjilles if (v > 127) 1252221513Sjilles v = '?'; 1253221513Sjilles break; 1254221513Sjilles default: 1255221513Sjilles synerror("Bad escape sequence"); 1256221513Sjilles } 1257221513Sjilles v = (char)v; 1258221513Sjilles /* 1259221513Sjilles * We can't handle NUL bytes. 1260221513Sjilles * POSIX says we should skip till the closing quote. 1261221513Sjilles */ 1262221513Sjilles if (v == '\0') { 1263221513Sjilles while ((c = pgetc()) != '\'') { 1264221513Sjilles if (c == '\\') 1265221513Sjilles c = pgetc(); 1266221513Sjilles if (c == PEOF) 1267221513Sjilles synerror("Unterminated quoted string"); 1268221513Sjilles } 1269221513Sjilles pungetc(); 1270221513Sjilles return out; 1271221513Sjilles } 1272221513Sjilles if (SQSYNTAX[v] == CCTL) 1273221513Sjilles USTPUTC(CTLESC, out); 1274221513Sjilles USTPUTC(v, out); 1275221513Sjilles return out; 1276221513Sjilles} 1277221513Sjilles 1278221513Sjilles 1279221513Sjilles/* 12801556Srgrimes * If eofmark is NULL, read a word or a redirection symbol. If eofmark 12811556Srgrimes * is not NULL, read a here document. In the latter case, eofmark is the 12821556Srgrimes * word which marks the end of the document and striptabs is true if 12831556Srgrimes * leading tabs should be stripped from the document. The argument firstc 12841556Srgrimes * is the first character of the input token or document. 12851556Srgrimes * 12861556Srgrimes * Because C does not have internal subroutines, I have simulated them 12871556Srgrimes * using goto's to implement the subroutine linkage. The following macros 12881556Srgrimes * will run code that appears at the end of readtoken1. 12891556Srgrimes */ 12901556Srgrimes 12911556Srgrimes#define CHECKEND() {goto checkend; checkend_return:;} 12921556Srgrimes#define PARSEREDIR() {goto parseredir; parseredir_return:;} 12931556Srgrimes#define PARSESUB() {goto parsesub; parsesub_return:;} 12941556Srgrimes#define PARSEARITH() {goto parsearith; parsearith_return:;} 12951556Srgrimes 1296213811Sobrienstatic int 1297206145Sjillesreadtoken1(int firstc, char const *initialsyntax, char *eofmark, int striptabs) 129890111Simp{ 129917987Speter int c = firstc; 130017987Speter char *out; 13011556Srgrimes int len; 13021556Srgrimes char line[EOFMARKLEN + 1]; 13031556Srgrimes struct nodelist *bqlist; 13041556Srgrimes int quotef; 1305206145Sjilles int newvarnest; 1306206145Sjilles int level; 130754679Scracauer int synentry; 1308213811Sobrien struct tokenstate state_static[MAXNEST_static]; 1309213811Sobrien int maxnest = MAXNEST_static; 1310206145Sjilles struct tokenstate *state = state_static; 1311221513Sjilles int sqiscstyle = 0; 13121556Srgrimes 13131556Srgrimes startlinno = plinno; 13141556Srgrimes quotef = 0; 13151556Srgrimes bqlist = NULL; 1316206145Sjilles newvarnest = 0; 1317206145Sjilles level = 0; 1318206145Sjilles state[level].syntax = initialsyntax; 1319206145Sjilles state[level].parenlevel = 0; 1320206145Sjilles state[level].category = TSTATE_TOP; 13211556Srgrimes 13221556Srgrimes STARTSTACKSTR(out); 13231556Srgrimes loop: { /* for each line, until end of word */ 13241556Srgrimes CHECKEND(); /* set c to PEOF if at end of here document */ 13251556Srgrimes for (;;) { /* until end of line or end of word */ 1326214512Sjilles CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ 132754679Scracauer 1328206145Sjilles synentry = state[level].syntax[c]; 132954679Scracauer 133054679Scracauer switch(synentry) { 13311556Srgrimes case CNL: /* '\n' */ 1332206145Sjilles if (state[level].syntax == BASESYNTAX) 13331556Srgrimes goto endword; /* exit outer loop */ 13341556Srgrimes USTPUTC(c, out); 13351556Srgrimes plinno++; 13361556Srgrimes if (doprompt) 13371556Srgrimes setprompt(2); 13381556Srgrimes else 13391556Srgrimes setprompt(0); 13401556Srgrimes c = pgetc(); 13411556Srgrimes goto loop; /* continue outer loop */ 1342221513Sjilles case CSBACK: 1343221513Sjilles if (sqiscstyle) { 1344221513Sjilles out = readcstyleesc(out); 1345221513Sjilles break; 1346221513Sjilles } 1347221513Sjilles /* FALLTHROUGH */ 13481556Srgrimes case CWORD: 13491556Srgrimes USTPUTC(c, out); 13501556Srgrimes break; 13511556Srgrimes case CCTL: 1352206145Sjilles if (eofmark == NULL || initialsyntax != SQSYNTAX) 13531556Srgrimes USTPUTC(CTLESC, out); 13541556Srgrimes USTPUTC(c, out); 13551556Srgrimes break; 13561556Srgrimes case CBACK: /* backslash */ 13571556Srgrimes c = pgetc(); 13581556Srgrimes if (c == PEOF) { 13591556Srgrimes USTPUTC('\\', out); 13601556Srgrimes pungetc(); 13611556Srgrimes } else if (c == '\n') { 1362160849Syar plinno++; 13631556Srgrimes if (doprompt) 13641556Srgrimes setprompt(2); 13651556Srgrimes else 13661556Srgrimes setprompt(0); 13671556Srgrimes } else { 1368206145Sjilles if (state[level].syntax == DQSYNTAX && 1369206145Sjilles c != '\\' && c != '`' && c != '$' && 1370206145Sjilles (c != '"' || (eofmark != NULL && 1371206145Sjilles newvarnest == 0)) && 1372206145Sjilles (c != '}' || state[level].category != TSTATE_VAR_OLD)) 13731556Srgrimes USTPUTC('\\', out); 1374214512Sjilles if ((eofmark == NULL || 1375214512Sjilles newvarnest > 0) && 1376214512Sjilles state[level].syntax == BASESYNTAX) 1377214512Sjilles USTPUTC(CTLQUOTEMARK, out); 137883675Stegge if (SQSYNTAX[c] == CCTL) 13791556Srgrimes USTPUTC(CTLESC, out); 13801556Srgrimes USTPUTC(c, out); 1381214512Sjilles if ((eofmark == NULL || 1382214512Sjilles newvarnest > 0) && 1383214512Sjilles state[level].syntax == BASESYNTAX && 1384214512Sjilles state[level].category == TSTATE_VAR_OLD) 1385214512Sjilles USTPUTC(CTLQUOTEEND, out); 13861556Srgrimes quotef++; 13871556Srgrimes } 13881556Srgrimes break; 13891556Srgrimes case CSQUOTE: 1390206145Sjilles USTPUTC(CTLQUOTEMARK, out); 1391206145Sjilles state[level].syntax = SQSYNTAX; 1392221513Sjilles sqiscstyle = 0; 13931556Srgrimes break; 13941556Srgrimes case CDQUOTE: 1395206145Sjilles USTPUTC(CTLQUOTEMARK, out); 1396206145Sjilles state[level].syntax = DQSYNTAX; 13971556Srgrimes break; 13981556Srgrimes case CENDQUOTE: 1399206145Sjilles if (eofmark != NULL && newvarnest == 0) 14001556Srgrimes USTPUTC(c, out); 1401206145Sjilles else { 1402214512Sjilles if (state[level].category == TSTATE_VAR_OLD) 1403214512Sjilles USTPUTC(CTLQUOTEEND, out); 1404214305Sjilles state[level].syntax = BASESYNTAX; 14051556Srgrimes quotef++; 14061556Srgrimes } 14071556Srgrimes break; 14081556Srgrimes case CVAR: /* '$' */ 14091556Srgrimes PARSESUB(); /* parse substitution */ 14101556Srgrimes break; 14111556Srgrimes case CENDVAR: /* '}' */ 1412206145Sjilles if (level > 0 && 1413214492Sjilles ((state[level].category == TSTATE_VAR_OLD && 1414214492Sjilles state[level].syntax == 1415214492Sjilles state[level - 1].syntax) || 1416214490Sjilles (state[level].category == TSTATE_VAR_NEW && 1417214490Sjilles state[level].syntax == BASESYNTAX))) { 1418214492Sjilles if (state[level].category == TSTATE_VAR_NEW) 1419206145Sjilles newvarnest--; 1420206145Sjilles level--; 14211556Srgrimes USTPUTC(CTLENDVAR, out); 14221556Srgrimes } else { 14231556Srgrimes USTPUTC(c, out); 14241556Srgrimes } 14251556Srgrimes break; 14261556Srgrimes case CLP: /* '(' in arithmetic */ 1427206145Sjilles state[level].parenlevel++; 14281556Srgrimes USTPUTC(c, out); 14291556Srgrimes break; 14301556Srgrimes case CRP: /* ')' in arithmetic */ 1431206145Sjilles if (state[level].parenlevel > 0) { 14321556Srgrimes USTPUTC(c, out); 1433206145Sjilles --state[level].parenlevel; 14341556Srgrimes } else { 14351556Srgrimes if (pgetc() == ')') { 1436206145Sjilles if (level > 0 && 1437206145Sjilles state[level].category == TSTATE_ARITH) { 1438206145Sjilles level--; 14391556Srgrimes USTPUTC(CTLENDARI, out); 14401556Srgrimes } else 14411556Srgrimes USTPUTC(')', out); 14421556Srgrimes } else { 14438855Srgrimes /* 14441556Srgrimes * unbalanced parens 14451556Srgrimes * (don't 2nd guess - no error) 14461556Srgrimes */ 14471556Srgrimes pungetc(); 14481556Srgrimes USTPUTC(')', out); 14491556Srgrimes } 14501556Srgrimes } 14511556Srgrimes break; 14521556Srgrimes case CBQUOTE: /* '`' */ 1453206145Sjilles out = parsebackq(out, &bqlist, 1, 1454206145Sjilles state[level].syntax == DQSYNTAX && 1455206145Sjilles (eofmark == NULL || newvarnest > 0), 1456206145Sjilles state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX); 14571556Srgrimes break; 14581556Srgrimes case CEOF: 14591556Srgrimes goto endword; /* exit outer loop */ 1460214305Sjilles case CIGN: 1461214305Sjilles break; 14621556Srgrimes default: 1463206145Sjilles if (level == 0) 14641556Srgrimes goto endword; /* exit outer loop */ 14651556Srgrimes USTPUTC(c, out); 14661556Srgrimes } 14671556Srgrimes c = pgetc_macro(); 14681556Srgrimes } 14691556Srgrimes } 14701556Srgrimesendword: 1471206145Sjilles if (state[level].syntax == ARISYNTAX) 14721556Srgrimes synerror("Missing '))'"); 1473206145Sjilles if (state[level].syntax != BASESYNTAX && eofmark == NULL) 14741556Srgrimes synerror("Unterminated quoted string"); 1475206145Sjilles if (state[level].category == TSTATE_VAR_OLD || 1476206145Sjilles state[level].category == TSTATE_VAR_NEW) { 14771556Srgrimes startlinno = plinno; 14781556Srgrimes synerror("Missing '}'"); 14791556Srgrimes } 1480206145Sjilles if (state != state_static) 1481206145Sjilles parser_temp_free_upto(state); 14821556Srgrimes USTPUTC('\0', out); 14831556Srgrimes len = out - stackblock(); 14841556Srgrimes out = stackblock(); 14851556Srgrimes if (eofmark == NULL) { 14861556Srgrimes if ((c == '>' || c == '<') 14871556Srgrimes && quotef == 0 14881556Srgrimes && len <= 2 14891556Srgrimes && (*out == '\0' || is_digit(*out))) { 14901556Srgrimes PARSEREDIR(); 14911556Srgrimes return lasttoken = TREDIR; 14921556Srgrimes } else { 14931556Srgrimes pungetc(); 14941556Srgrimes } 14951556Srgrimes } 14961556Srgrimes quoteflag = quotef; 14971556Srgrimes backquotelist = bqlist; 14981556Srgrimes grabstackblock(len); 14991556Srgrimes wordtext = out; 15001556Srgrimes return lasttoken = TWORD; 15011556Srgrimes/* end of readtoken routine */ 15021556Srgrimes 15031556Srgrimes 15041556Srgrimes/* 15051556Srgrimes * Check to see whether we are at the end of the here document. When this 15061556Srgrimes * is called, c is set to the first character of the next input line. If 15071556Srgrimes * we are at the end of the here document, this routine sets the c to PEOF. 15081556Srgrimes */ 15091556Srgrimes 15101556Srgrimescheckend: { 15111556Srgrimes if (eofmark) { 15121556Srgrimes if (striptabs) { 15131556Srgrimes while (c == '\t') 15141556Srgrimes c = pgetc(); 15151556Srgrimes } 15161556Srgrimes if (c == *eofmark) { 15171556Srgrimes if (pfgets(line, sizeof line) != NULL) { 151825230Ssteve char *p, *q; 15191556Srgrimes 15201556Srgrimes p = line; 15211556Srgrimes for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 1522222134Sjilles if ((*p == '\0' || *p == '\n') && *q == '\0') { 15231556Srgrimes c = PEOF; 1524222134Sjilles if (*p == '\n') { 1525222134Sjilles plinno++; 1526222134Sjilles needprompt = doprompt; 1527222134Sjilles } 15281556Srgrimes } else { 15291556Srgrimes pushstring(line, strlen(line), NULL); 15301556Srgrimes } 15311556Srgrimes } 15321556Srgrimes } 15331556Srgrimes } 15341556Srgrimes goto checkend_return; 15351556Srgrimes} 15361556Srgrimes 15371556Srgrimes 15381556Srgrimes/* 15391556Srgrimes * Parse a redirection operator. The variable "out" points to a string 15401556Srgrimes * specifying the fd to be redirected. The variable "c" contains the 15411556Srgrimes * first character of the redirection operator. 15421556Srgrimes */ 15431556Srgrimes 15441556Srgrimesparseredir: { 15451556Srgrimes char fd = *out; 15461556Srgrimes union node *np; 15471556Srgrimes 15481556Srgrimes np = (union node *)stalloc(sizeof (struct nfile)); 15491556Srgrimes if (c == '>') { 15501556Srgrimes np->nfile.fd = 1; 15511556Srgrimes c = pgetc(); 15521556Srgrimes if (c == '>') 15531556Srgrimes np->type = NAPPEND; 15541556Srgrimes else if (c == '&') 15551556Srgrimes np->type = NTOFD; 155696922Stjr else if (c == '|') 155796922Stjr np->type = NCLOBBER; 15581556Srgrimes else { 15591556Srgrimes np->type = NTO; 15601556Srgrimes pungetc(); 15611556Srgrimes } 15621556Srgrimes } else { /* c == '<' */ 15631556Srgrimes np->nfile.fd = 0; 15641556Srgrimes c = pgetc(); 15651556Srgrimes if (c == '<') { 15661556Srgrimes if (sizeof (struct nfile) != sizeof (struct nhere)) { 15671556Srgrimes np = (union node *)stalloc(sizeof (struct nhere)); 15681556Srgrimes np->nfile.fd = 0; 15691556Srgrimes } 15701556Srgrimes np->type = NHERE; 15711556Srgrimes heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 15721556Srgrimes heredoc->here = np; 15731556Srgrimes if ((c = pgetc()) == '-') { 15741556Srgrimes heredoc->striptabs = 1; 15751556Srgrimes } else { 15761556Srgrimes heredoc->striptabs = 0; 15771556Srgrimes pungetc(); 15781556Srgrimes } 15791556Srgrimes } else if (c == '&') 15801556Srgrimes np->type = NFROMFD; 158166612Sbrian else if (c == '>') 158266612Sbrian np->type = NFROMTO; 15831556Srgrimes else { 15841556Srgrimes np->type = NFROM; 15851556Srgrimes pungetc(); 15861556Srgrimes } 15871556Srgrimes } 15881556Srgrimes if (fd != '\0') 15891556Srgrimes np->nfile.fd = digit_val(fd); 15901556Srgrimes redirnode = np; 15911556Srgrimes goto parseredir_return; 15921556Srgrimes} 15931556Srgrimes 15941556Srgrimes 15951556Srgrimes/* 15961556Srgrimes * Parse a substitution. At this point, we have read the dollar sign 15971556Srgrimes * and nothing else. 15981556Srgrimes */ 15991556Srgrimes 16001556Srgrimesparsesub: { 1601179022Sstefanf char buf[10]; 16021556Srgrimes int subtype; 16031556Srgrimes int typeloc; 16041556Srgrimes int flags; 16051556Srgrimes char *p; 16061556Srgrimes static const char types[] = "}-+?="; 1607179022Sstefanf int bracketed_name = 0; /* used to handle ${[0-9]*} variables */ 1608179022Sstefanf int linno; 1609179387Sstefanf int length; 1610219623Sjilles int c1; 16111556Srgrimes 16121556Srgrimes c = pgetc(); 1613221513Sjilles if (c == '(') { /* $(command) or $((arith)) */ 16141556Srgrimes if (pgetc() == '(') { 16151556Srgrimes PARSEARITH(); 16161556Srgrimes } else { 16171556Srgrimes pungetc(); 1618206145Sjilles out = parsebackq(out, &bqlist, 0, 1619206145Sjilles state[level].syntax == DQSYNTAX && 1620206145Sjilles (eofmark == NULL || newvarnest > 0), 1621206145Sjilles state[level].syntax == DQSYNTAX || 1622206145Sjilles state[level].syntax == ARISYNTAX); 16231556Srgrimes } 1624221513Sjilles } else if (c == '{' || is_name(c) || is_special(c)) { 16251556Srgrimes USTPUTC(CTLVAR, out); 16261556Srgrimes typeloc = out - stackblock(); 16271556Srgrimes USTPUTC(VSNORMAL, out); 16281556Srgrimes subtype = VSNORMAL; 1629179022Sstefanf flags = 0; 16301556Srgrimes if (c == '{') { 163118202Speter bracketed_name = 1; 16321556Srgrimes c = pgetc(); 1633219623Sjilles subtype = 0; 16341556Srgrimes } 1635219623Sjillesvarname: 1636149026Sstefanf if (!is_eof(c) && is_name(c)) { 1637179387Sstefanf length = 0; 16381556Srgrimes do { 16391556Srgrimes STPUTC(c, out); 16401556Srgrimes c = pgetc(); 1641179387Sstefanf length++; 1642149026Sstefanf } while (!is_eof(c) && is_in_name(c)); 1643179387Sstefanf if (length == 6 && 1644179387Sstefanf strncmp(out - length, "LINENO", length) == 0) { 1645179022Sstefanf /* Replace the variable name with the 1646179022Sstefanf * current line number. */ 1647179022Sstefanf linno = plinno; 1648179022Sstefanf if (funclinno != 0) 1649179022Sstefanf linno -= funclinno - 1; 1650179022Sstefanf snprintf(buf, sizeof(buf), "%d", linno); 1651179022Sstefanf STADJUST(-6, out); 1652215783Sjilles STPUTS(buf, out); 1653179022Sstefanf flags |= VSLINENO; 1654179022Sstefanf } 165518202Speter } else if (is_digit(c)) { 165618202Speter if (bracketed_name) { 165718202Speter do { 165818202Speter STPUTC(c, out); 165918202Speter c = pgetc(); 166018202Speter } while (is_digit(c)); 166118202Speter } else { 166218202Speter STPUTC(c, out); 166318202Speter c = pgetc(); 166418202Speter } 1665219623Sjilles } else if (is_special(c)) { 1666219623Sjilles c1 = c; 1667219623Sjilles c = pgetc(); 1668219623Sjilles if (subtype == 0 && c1 == '#') { 1669219623Sjilles subtype = VSLENGTH; 1670219623Sjilles if (strchr(types, c) == NULL && c != ':' && 1671219623Sjilles c != '#' && c != '%') 1672219623Sjilles goto varname; 1673219623Sjilles c1 = c; 1674219623Sjilles c = pgetc(); 1675219623Sjilles if (c1 != '}' && c == '}') { 1676219623Sjilles pungetc(); 1677219623Sjilles c = c1; 1678219623Sjilles goto varname; 1679219623Sjilles } 1680219623Sjilles pungetc(); 1681219623Sjilles c = c1; 1682219623Sjilles c1 = '#'; 1683219623Sjilles subtype = 0; 1684219623Sjilles } 1685219623Sjilles USTPUTC(c1, out); 16861556Srgrimes } else { 1687219623Sjilles subtype = VSERROR; 1688219623Sjilles if (c == '}') 1689219623Sjilles pungetc(); 1690219623Sjilles else if (c == '\n' || c == PEOF) 1691219623Sjilles synerror("Unexpected end of line in substitution"); 1692219623Sjilles else 1693164003Sstefanf USTPUTC(c, out); 16941556Srgrimes } 16951556Srgrimes if (subtype == 0) { 169617987Speter switch (c) { 169717987Speter case ':': 1698179022Sstefanf flags |= VSNUL; 16991556Srgrimes c = pgetc(); 170017987Speter /*FALLTHROUGH*/ 170117987Speter default: 170217987Speter p = strchr(types, c); 1703164003Sstefanf if (p == NULL) { 1704206144Sjilles if (c == '\n' || c == PEOF) 1705206144Sjilles synerror("Unexpected end of line in substitution"); 1706164003Sstefanf if (flags == VSNUL) 1707164003Sstefanf STPUTC(':', out); 1708164003Sstefanf STPUTC(c, out); 1709164003Sstefanf subtype = VSERROR; 1710164003Sstefanf } else 1711164003Sstefanf subtype = p - types + VSNORMAL; 171217987Speter break; 171317987Speter case '%': 171420425Ssteve case '#': 171517987Speter { 171617987Speter int cc = c; 171717987Speter subtype = c == '#' ? VSTRIMLEFT : 171817987Speter VSTRIMRIGHT; 171917987Speter c = pgetc(); 172017987Speter if (c == cc) 172117987Speter subtype++; 172217987Speter else 172317987Speter pungetc(); 172417987Speter break; 172517987Speter } 17261556Srgrimes } 1727164003Sstefanf } else if (subtype != VSERROR) { 1728221461Sjilles if (subtype == VSLENGTH && c != '}') 1729221461Sjilles subtype = VSERROR; 17301556Srgrimes pungetc(); 17311556Srgrimes } 1732164003Sstefanf STPUTC('=', out); 1733220903Sjilles if (state[level].syntax == DQSYNTAX || 1734220903Sjilles state[level].syntax == ARISYNTAX) 17351556Srgrimes flags |= VSQUOTE; 17361556Srgrimes *(stackblock() + typeloc) = subtype | flags; 1737206145Sjilles if (subtype != VSNORMAL) { 1738206145Sjilles if (level + 1 >= maxnest) { 1739206145Sjilles maxnest *= 2; 1740206145Sjilles if (state == state_static) { 1741206145Sjilles state = parser_temp_alloc( 1742206145Sjilles maxnest * sizeof(*state)); 1743206145Sjilles memcpy(state, state_static, 1744213811Sobrien MAXNEST_static * sizeof(*state)); 1745206145Sjilles } else 1746206145Sjilles state = parser_temp_realloc(state, 1747206145Sjilles maxnest * sizeof(*state)); 1748206145Sjilles } 1749206145Sjilles level++; 1750206145Sjilles state[level].parenlevel = 0; 1751206145Sjilles if (subtype == VSMINUS || subtype == VSPLUS || 1752206145Sjilles subtype == VSQUESTION || subtype == VSASSIGN) { 1753206145Sjilles /* 1754206145Sjilles * For operators that were in the Bourne shell, 1755206145Sjilles * inherit the double-quote state. 1756206145Sjilles */ 1757206145Sjilles state[level].syntax = state[level - 1].syntax; 1758206145Sjilles state[level].category = TSTATE_VAR_OLD; 1759206145Sjilles } else { 1760206145Sjilles /* 1761206145Sjilles * The other operators take a pattern, 1762206145Sjilles * so go to BASESYNTAX. 1763206145Sjilles * Also, ' and " are now special, even 1764206145Sjilles * in here documents. 1765206145Sjilles */ 1766206145Sjilles state[level].syntax = BASESYNTAX; 1767206145Sjilles state[level].category = TSTATE_VAR_NEW; 1768206145Sjilles newvarnest++; 1769206145Sjilles } 1770206145Sjilles } 1771221513Sjilles } else if (c == '\'' && state[level].syntax == BASESYNTAX) { 1772221513Sjilles /* $'cstylequotes' */ 1773221513Sjilles USTPUTC(CTLQUOTEMARK, out); 1774221513Sjilles state[level].syntax = SQSYNTAX; 1775221513Sjilles sqiscstyle = 1; 1776221513Sjilles } else { 1777221513Sjilles USTPUTC('$', out); 1778221513Sjilles pungetc(); 17791556Srgrimes } 17801556Srgrimes goto parsesub_return; 17811556Srgrimes} 17821556Srgrimes 17831556Srgrimes 17841556Srgrimes/* 17851556Srgrimes * Parse an arithmetic expansion (indicate start of one and set state) 17861556Srgrimes */ 17871556Srgrimesparsearith: { 17881556Srgrimes 1789206145Sjilles if (level + 1 >= maxnest) { 1790206145Sjilles maxnest *= 2; 1791206145Sjilles if (state == state_static) { 1792206145Sjilles state = parser_temp_alloc( 1793206145Sjilles maxnest * sizeof(*state)); 1794206145Sjilles memcpy(state, state_static, 1795213811Sobrien MAXNEST_static * sizeof(*state)); 1796206145Sjilles } else 1797206145Sjilles state = parser_temp_realloc(state, 1798206145Sjilles maxnest * sizeof(*state)); 17991556Srgrimes } 1800206145Sjilles level++; 1801206145Sjilles state[level].syntax = ARISYNTAX; 1802206145Sjilles state[level].parenlevel = 0; 1803206145Sjilles state[level].category = TSTATE_ARITH; 1804206145Sjilles USTPUTC(CTLARI, out); 1805206145Sjilles if (state[level - 1].syntax == DQSYNTAX) 1806206145Sjilles USTPUTC('"',out); 1807206145Sjilles else 1808206145Sjilles USTPUTC(' ',out); 18091556Srgrimes goto parsearith_return; 18101556Srgrimes} 18111556Srgrimes 18121556Srgrimes} /* end of readtoken */ 18131556Srgrimes 18141556Srgrimes 18151556Srgrimes 18161556Srgrimes#ifdef mkinit 18171556SrgrimesRESET { 18181556Srgrimes tokpushback = 0; 18191556Srgrimes checkkwd = 0; 18201556Srgrimes} 18211556Srgrimes#endif 18221556Srgrimes 18231556Srgrimes/* 18241556Srgrimes * Returns true if the text contains nothing to expand (no dollar signs 18251556Srgrimes * or backquotes). 18261556Srgrimes */ 18271556Srgrimes 1828213811Sobrienstatic int 182990111Simpnoexpand(char *text) 183090111Simp{ 183125230Ssteve char *p; 183225230Ssteve char c; 18331556Srgrimes 18341556Srgrimes p = text; 18351556Srgrimes while ((c = *p++) != '\0') { 183639137Stegge if ( c == CTLQUOTEMARK) 183739137Stegge continue; 18381556Srgrimes if (c == CTLESC) 18391556Srgrimes p++; 184083675Stegge else if (BASESYNTAX[(int)c] == CCTL) 18411556Srgrimes return 0; 18421556Srgrimes } 18431556Srgrimes return 1; 18441556Srgrimes} 18451556Srgrimes 18461556Srgrimes 18471556Srgrimes/* 18481556Srgrimes * Return true if the argument is a legal variable name (a letter or 18491556Srgrimes * underscore followed by zero or more letters, underscores, and digits). 18501556Srgrimes */ 18511556Srgrimes 18521556Srgrimesint 1853200956Sjillesgoodname(const char *name) 185490111Simp{ 1855200956Sjilles const char *p; 18561556Srgrimes 18571556Srgrimes p = name; 18581556Srgrimes if (! is_name(*p)) 18591556Srgrimes return 0; 18601556Srgrimes while (*++p) { 18611556Srgrimes if (! is_in_name(*p)) 18621556Srgrimes return 0; 18631556Srgrimes } 18641556Srgrimes return 1; 18651556Srgrimes} 18661556Srgrimes 18671556Srgrimes 1868222165Sjillesint 1869222165Sjillesisassignment(const char *p) 1870222165Sjilles{ 1871222165Sjilles if (!is_name(*p)) 1872222165Sjilles return 0; 1873222165Sjilles p++; 1874222165Sjilles for (;;) { 1875222165Sjilles if (*p == '=') 1876222165Sjilles return 1; 1877222165Sjilles else if (!is_in_name(*p)) 1878222165Sjilles return 0; 1879222165Sjilles p++; 1880222165Sjilles } 1881222165Sjilles} 1882222165Sjilles 1883222165Sjilles 18841556Srgrimes/* 18851556Srgrimes * Called when an unexpected token is read during the parse. The argument 18861556Srgrimes * is the token that is expected, or -1 if more than one type of token can 18871556Srgrimes * occur at this point. 18881556Srgrimes */ 18891556Srgrimes 1890213811Sobrienstatic void 189190111Simpsynexpect(int token) 189217987Speter{ 18931556Srgrimes char msg[64]; 18941556Srgrimes 18951556Srgrimes if (token >= 0) { 18961556Srgrimes fmtstr(msg, 64, "%s unexpected (expecting %s)", 18971556Srgrimes tokname[lasttoken], tokname[token]); 18981556Srgrimes } else { 18991556Srgrimes fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 19001556Srgrimes } 19011556Srgrimes synerror(msg); 19021556Srgrimes} 19031556Srgrimes 19041556Srgrimes 1905213811Sobrienstatic void 1906201053Sjillessynerror(const char *msg) 190790111Simp{ 19081556Srgrimes if (commandname) 1909201366Sjilles outfmt(out2, "%s: %d: ", commandname, startlinno); 1910201366Sjilles outfmt(out2, "Syntax error: %s\n", msg); 19111556Srgrimes error((char *)NULL); 19121556Srgrimes} 19131556Srgrimes 1914213811Sobrienstatic void 191590111Simpsetprompt(int which) 191690111Simp{ 19171556Srgrimes whichprompt = which; 19181556Srgrimes 191917987Speter#ifndef NO_HISTORY 19201556Srgrimes if (!el) 192117987Speter#endif 1922199629Sjilles { 19231556Srgrimes out2str(getprompt(NULL)); 1924199629Sjilles flushout(out2); 1925199629Sjilles } 19261556Srgrimes} 19271556Srgrimes 19281556Srgrimes/* 19291556Srgrimes * called by editline -- any expansions to the prompt 19301556Srgrimes * should be added here. 19311556Srgrimes */ 19321556Srgrimeschar * 193390111Simpgetprompt(void *unused __unused) 193425905Ssteve{ 1935142845Sobrien static char ps[PROMPTLEN]; 1936142845Sobrien char *fmt; 1937209653Sjilles const char *pwd; 1938209653Sjilles int i, trim; 1939214538Sjilles static char internal_error[] = "??"; 1940142845Sobrien 1941142845Sobrien /* 1942142845Sobrien * Select prompt format. 1943142845Sobrien */ 19441556Srgrimes switch (whichprompt) { 19451556Srgrimes case 0: 1946201053Sjilles fmt = nullstr; 1947142845Sobrien break; 19481556Srgrimes case 1: 1949142845Sobrien fmt = ps1val(); 1950142845Sobrien break; 19511556Srgrimes case 2: 1952142845Sobrien fmt = ps2val(); 1953142845Sobrien break; 19541556Srgrimes default: 1955201053Sjilles return internal_error; 19561556Srgrimes } 1957142845Sobrien 1958142845Sobrien /* 1959142845Sobrien * Format prompt string. 1960142845Sobrien */ 1961142845Sobrien for (i = 0; (i < 127) && (*fmt != '\0'); i++, fmt++) 1962142845Sobrien if (*fmt == '\\') 1963142845Sobrien switch (*++fmt) { 1964142845Sobrien 1965142845Sobrien /* 1966142845Sobrien * Hostname. 1967142845Sobrien * 1968142845Sobrien * \h specifies just the local hostname, 1969142845Sobrien * \H specifies fully-qualified hostname. 1970142845Sobrien */ 1971142845Sobrien case 'h': 1972142845Sobrien case 'H': 1973149024Sstefanf ps[i] = '\0'; 1974142845Sobrien gethostname(&ps[i], PROMPTLEN - i); 1975142845Sobrien /* Skip to end of hostname. */ 1976142845Sobrien trim = (*fmt == 'h') ? '.' : '\0'; 1977142845Sobrien while ((ps[i+1] != '\0') && (ps[i+1] != trim)) 1978142845Sobrien i++; 1979142845Sobrien break; 1980142845Sobrien 1981142845Sobrien /* 1982142845Sobrien * Working directory. 1983142845Sobrien * 1984142845Sobrien * \W specifies just the final component, 1985142845Sobrien * \w specifies the entire path. 1986142845Sobrien */ 1987142845Sobrien case 'W': 1988142845Sobrien case 'w': 1989209653Sjilles pwd = lookupvar("PWD"); 1990209653Sjilles if (pwd == NULL) 1991209653Sjilles pwd = "?"; 1992209653Sjilles if (*fmt == 'W' && 1993209653Sjilles *pwd == '/' && pwd[1] != '\0') 1994209653Sjilles strlcpy(&ps[i], strrchr(pwd, '/') + 1, 1995209653Sjilles PROMPTLEN - i); 1996209653Sjilles else 1997209653Sjilles strlcpy(&ps[i], pwd, PROMPTLEN - i); 1998142845Sobrien /* Skip to end of path. */ 1999142845Sobrien while (ps[i + 1] != '\0') 2000142845Sobrien i++; 2001142845Sobrien break; 2002142845Sobrien 2003142845Sobrien /* 2004142845Sobrien * Superuser status. 2005142845Sobrien * 2006142845Sobrien * '$' for normal users, '#' for root. 2007142845Sobrien */ 2008142845Sobrien case '$': 2009142845Sobrien ps[i] = (geteuid() != 0) ? '$' : '#'; 2010142845Sobrien break; 2011142845Sobrien 2012142845Sobrien /* 2013142845Sobrien * A literal \. 2014142845Sobrien */ 2015142845Sobrien case '\\': 2016142845Sobrien ps[i] = '\\'; 2017142845Sobrien break; 2018142845Sobrien 2019142845Sobrien /* 2020142845Sobrien * Emit unrecognized formats verbatim. 2021142845Sobrien */ 2022142845Sobrien default: 2023142845Sobrien ps[i++] = '\\'; 2024142845Sobrien ps[i] = *fmt; 2025142845Sobrien break; 2026142845Sobrien } 2027142845Sobrien else 2028142845Sobrien ps[i] = *fmt; 2029142845Sobrien ps[i] = '\0'; 2030142845Sobrien return (ps); 20311556Srgrimes} 2032222907Sjilles 2033222907Sjilles 2034222907Sjillesconst char * 2035222907Sjillesexpandstr(char *ps) 2036222907Sjilles{ 2037222907Sjilles union node n; 2038222907Sjilles struct jmploc jmploc; 2039222907Sjilles struct jmploc *const savehandler = handler; 2040222907Sjilles const int saveprompt = doprompt; 2041222907Sjilles struct parsefile *const savetopfile = getcurrentfile(); 2042222907Sjilles struct parser_temp *const saveparser_temp = parser_temp; 2043222907Sjilles const char *result = NULL; 2044222907Sjilles 2045222907Sjilles if (!setjmp(jmploc.loc)) { 2046222907Sjilles handler = &jmploc; 2047222907Sjilles parser_temp = NULL; 2048222907Sjilles setinputstring(ps, 1); 2049222907Sjilles doprompt = 0; 2050222907Sjilles readtoken1(pgetc(), DQSYNTAX, "\n\n", 0); 2051222907Sjilles if (backquotelist != NULL) 2052222907Sjilles error("Command substitution not allowed here"); 2053222907Sjilles 2054222907Sjilles n.narg.type = NARG; 2055222907Sjilles n.narg.next = NULL; 2056222907Sjilles n.narg.text = wordtext; 2057222907Sjilles n.narg.backquote = backquotelist; 2058222907Sjilles 2059222907Sjilles expandarg(&n, NULL, 0); 2060222907Sjilles result = stackblock(); 2061222907Sjilles INTOFF; 2062222907Sjilles } 2063222907Sjilles handler = savehandler; 2064222907Sjilles doprompt = saveprompt; 2065222907Sjilles popfilesupto(savetopfile); 2066222907Sjilles if (parser_temp != saveparser_temp) { 2067222907Sjilles parser_temp_free_all(); 2068222907Sjilles parser_temp = saveparser_temp; 2069222907Sjilles } 2070222907Sjilles if (result != NULL) { 2071222907Sjilles INTON; 2072222907Sjilles } else if (exception == EXINT) 2073222907Sjilles raise(SIGINT); 2074222907Sjilles return result; 2075222907Sjilles} 2076