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("$FreeBSD$"); 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 */ 99255068Sjillesstatic int tokpushback; /* last token pushed back */ 100213760Sobrienstatic char *wordtext; /* text of last word returned by readtoken */ 101253659Sjillesstatic int checkkwd; 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 111255087Sjillesstatic union node *list(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); 117255085Sjillesstatic union node *makebinary(int type, union node *n1, union node *n2); 118213811Sobrienstatic void parsefname(void); 119213811Sobrienstatic void parseheredoc(void); 120213811Sobrienstatic int peektoken(void); 121213811Sobrienstatic int readtoken(void); 122213811Sobrienstatic int xxreadtoken(void); 123248980Sjillesstatic int readtoken1(int, const char *, const char *, int); 124213811Sobrienstatic int noexpand(char *); 125255073Sjillesstatic void consumetoken(int); 126213811Sobrienstatic void synexpect(int) __dead2; 127213811Sobrienstatic void synerror(const char *) __dead2; 128213811Sobrienstatic void setprompt(int); 1291556Srgrimes 13017987Speter 131213811Sobrienstatic void * 132206145Sjillesparser_temp_alloc(size_t len) 133206145Sjilles{ 134206145Sjilles struct parser_temp *t; 135206145Sjilles 136206145Sjilles INTOFF; 137206145Sjilles t = ckmalloc(sizeof(*t)); 138206145Sjilles t->data = NULL; 139206145Sjilles t->next = parser_temp; 140206145Sjilles parser_temp = t; 141206145Sjilles t->data = ckmalloc(len); 142206145Sjilles INTON; 143206145Sjilles return t->data; 144206145Sjilles} 145206145Sjilles 146206145Sjilles 147213811Sobrienstatic void * 148206145Sjillesparser_temp_realloc(void *ptr, size_t len) 149206145Sjilles{ 150206145Sjilles struct parser_temp *t; 151206145Sjilles 152206145Sjilles INTOFF; 153206145Sjilles t = parser_temp; 154206145Sjilles if (ptr != t->data) 155206145Sjilles error("bug: parser_temp_realloc misused"); 156206145Sjilles t->data = ckrealloc(t->data, len); 157206145Sjilles INTON; 158206145Sjilles return t->data; 159206145Sjilles} 160206145Sjilles 161206145Sjilles 162213811Sobrienstatic void 163206145Sjillesparser_temp_free_upto(void *ptr) 164206145Sjilles{ 165206145Sjilles struct parser_temp *t; 166206145Sjilles int done = 0; 167206145Sjilles 168206145Sjilles INTOFF; 169206145Sjilles while (parser_temp != NULL && !done) { 170206145Sjilles t = parser_temp; 171206145Sjilles parser_temp = t->next; 172206145Sjilles done = t->data == ptr; 173206145Sjilles ckfree(t->data); 174206145Sjilles ckfree(t); 175206145Sjilles } 176206145Sjilles INTON; 177206145Sjilles if (!done) 178206145Sjilles error("bug: parser_temp_free_upto misused"); 179206145Sjilles} 180206145Sjilles 181206145Sjilles 182213811Sobrienstatic void 183206145Sjillesparser_temp_free_all(void) 184206145Sjilles{ 185206145Sjilles struct parser_temp *t; 186206145Sjilles 187206145Sjilles INTOFF; 188206145Sjilles while (parser_temp != NULL) { 189206145Sjilles t = parser_temp; 190206145Sjilles parser_temp = t->next; 191206145Sjilles ckfree(t->data); 192206145Sjilles ckfree(t); 193206145Sjilles } 194206145Sjilles INTON; 195206145Sjilles} 196206145Sjilles 197206145Sjilles 1981556Srgrimes/* 1991556Srgrimes * Read and parse a command. Returns NEOF on end of file. (NULL is a 2001556Srgrimes * valid parse tree indicating a blank line.) 2011556Srgrimes */ 2021556Srgrimes 2031556Srgrimesunion node * 20490111Simpparsecmd(int interact) 20517987Speter{ 2061556Srgrimes int t; 2071556Srgrimes 208206145Sjilles /* This assumes the parser is not re-entered, 209206145Sjilles * which could happen if we add command substitution on PS1/PS2. 210206145Sjilles */ 211206145Sjilles parser_temp_free_all(); 212208656Sjilles heredoclist = NULL; 213206145Sjilles 21460593Scracauer tokpushback = 0; 215254426Sjilles checkkwd = 0; 2161556Srgrimes doprompt = interact; 2171556Srgrimes if (doprompt) 2181556Srgrimes setprompt(1); 2191556Srgrimes else 2201556Srgrimes setprompt(0); 2211556Srgrimes needprompt = 0; 2221556Srgrimes t = readtoken(); 2231556Srgrimes if (t == TEOF) 2241556Srgrimes return NEOF; 2251556Srgrimes if (t == TNL) 2261556Srgrimes return NULL; 2271556Srgrimes tokpushback++; 228255087Sjilles return list(1); 2291556Srgrimes} 2301556Srgrimes 2311556Srgrimes 232289938Sjilles/* 233289938Sjilles * Read and parse words for wordexp. 234289938Sjilles * Returns a list of NARG nodes; NULL if there are no words. 235289938Sjilles */ 236289938Sjillesunion node * 237289938Sjillesparsewordexp(void) 238289938Sjilles{ 239289938Sjilles union node *n, *first = NULL, **pnext; 240289938Sjilles int t; 241289938Sjilles 242289938Sjilles /* This assumes the parser is not re-entered, 243289938Sjilles * which could happen if we add command substitution on PS1/PS2. 244289938Sjilles */ 245289938Sjilles parser_temp_free_all(); 246289938Sjilles heredoclist = NULL; 247289938Sjilles 248289938Sjilles tokpushback = 0; 249289938Sjilles checkkwd = 0; 250289938Sjilles doprompt = 0; 251289938Sjilles setprompt(0); 252289938Sjilles needprompt = 0; 253289938Sjilles pnext = &first; 254289938Sjilles while ((t = readtoken()) != TEOF) { 255289938Sjilles if (t != TWORD) 256289938Sjilles synexpect(TWORD); 257289938Sjilles n = makename(); 258289938Sjilles *pnext = n; 259289938Sjilles pnext = &n->narg.next; 260289938Sjilles } 261289938Sjilles return first; 262289938Sjilles} 263289938Sjilles 264289938Sjilles 265213811Sobrienstatic union node * 266255087Sjilleslist(int nlflag) 26717987Speter{ 268214599Sjilles union node *ntop, *n1, *n2, *n3; 26917987Speter int tok; 2701556Srgrimes 271214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 272255087Sjilles if (!nlflag && tokendlist[peektoken()]) 2731556Srgrimes return NULL; 274214599Sjilles ntop = n1 = NULL; 2751556Srgrimes for (;;) { 27617987Speter n2 = andor(); 27717987Speter tok = readtoken(); 27817987Speter if (tok == TBACKGND) { 279245382Sjilles if (n2 != NULL && n2->type == NPIPE) { 280223282Sjilles n2->npipe.backgnd = 1; 281245382Sjilles } else if (n2 != NULL && n2->type == NREDIR) { 28217987Speter n2->type = NBACKGND; 28317987Speter } else { 28417987Speter n3 = (union node *)stalloc(sizeof (struct nredir)); 28517987Speter n3->type = NBACKGND; 28617987Speter n3->nredir.n = n2; 28717987Speter n3->nredir.redirect = NULL; 28817987Speter n2 = n3; 28917987Speter } 29017987Speter } 291214599Sjilles if (ntop == NULL) 292214599Sjilles ntop = n2; 293214599Sjilles else if (n1 == NULL) { 294255085Sjilles n1 = makebinary(NSEMI, ntop, n2); 295214599Sjilles ntop = n1; 29617987Speter } 29717987Speter else { 298255085Sjilles n3 = makebinary(NSEMI, n1->nbinary.ch2, n2); 299214599Sjilles n1->nbinary.ch2 = n3; 30017987Speter n1 = n3; 30117987Speter } 30217987Speter switch (tok) { 30313882Sjoerg case TBACKGND: 30417987Speter case TSEMI: 30517987Speter tok = readtoken(); 306102410Scharnier /* FALLTHROUGH */ 3071556Srgrimes case TNL: 30817987Speter if (tok == TNL) { 30917987Speter parseheredoc(); 31017987Speter if (nlflag) 311214599Sjilles return ntop; 312210488Sjilles } else if (tok == TEOF && nlflag) { 313210488Sjilles parseheredoc(); 314214599Sjilles return ntop; 31517987Speter } else { 31617987Speter tokpushback++; 31717987Speter } 318214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 319255087Sjilles if (!nlflag && tokendlist[peektoken()]) 320214599Sjilles return ntop; 3211556Srgrimes break; 3221556Srgrimes case TEOF: 3231556Srgrimes if (heredoclist) 3241556Srgrimes parseheredoc(); 3251556Srgrimes else 3261556Srgrimes pungetc(); /* push back EOF on input */ 327214599Sjilles return ntop; 3281556Srgrimes default: 329255087Sjilles if (nlflag) 3301556Srgrimes synexpect(-1); 3311556Srgrimes tokpushback++; 332214599Sjilles return ntop; 3331556Srgrimes } 3341556Srgrimes } 3351556Srgrimes} 3361556Srgrimes 3371556Srgrimes 3381556Srgrimes 339213811Sobrienstatic union node * 34090111Simpandor(void) 34190111Simp{ 342255085Sjilles union node *n; 3431556Srgrimes int t; 3441556Srgrimes 345255085Sjilles n = pipeline(); 3461556Srgrimes for (;;) { 3471556Srgrimes if ((t = readtoken()) == TAND) { 3481556Srgrimes t = NAND; 3491556Srgrimes } else if (t == TOR) { 3501556Srgrimes t = NOR; 3511556Srgrimes } else { 3521556Srgrimes tokpushback++; 353255085Sjilles return n; 3541556Srgrimes } 355255085Sjilles n = makebinary(t, n, pipeline()); 3561556Srgrimes } 3571556Srgrimes} 3581556Srgrimes 3591556Srgrimes 3601556Srgrimes 361213811Sobrienstatic union node * 36290111Simppipeline(void) 36390111Simp{ 36475336Sbrian union node *n1, *n2, *pipenode; 3651556Srgrimes struct nodelist *lp, *prev; 366214281Sjilles int negate, t; 3671556Srgrimes 36875336Sbrian negate = 0; 369214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 3701556Srgrimes TRACE(("pipeline: entered\n")); 37175336Sbrian while (readtoken() == TNOT) 37275336Sbrian negate = !negate; 37375336Sbrian tokpushback++; 3741556Srgrimes n1 = command(); 3751556Srgrimes if (readtoken() == TPIPE) { 3761556Srgrimes pipenode = (union node *)stalloc(sizeof (struct npipe)); 3771556Srgrimes pipenode->type = NPIPE; 3781556Srgrimes pipenode->npipe.backgnd = 0; 3791556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 3801556Srgrimes pipenode->npipe.cmdlist = lp; 3811556Srgrimes lp->n = n1; 3821556Srgrimes do { 3831556Srgrimes prev = lp; 3841556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 385214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 386214281Sjilles t = readtoken(); 387214281Sjilles tokpushback++; 388214281Sjilles if (t == TNOT) 389214281Sjilles lp->n = pipeline(); 390214281Sjilles else 391214281Sjilles lp->n = command(); 3921556Srgrimes prev->next = lp; 3931556Srgrimes } while (readtoken() == TPIPE); 3941556Srgrimes lp->next = NULL; 3951556Srgrimes n1 = pipenode; 3961556Srgrimes } 3971556Srgrimes tokpushback++; 39875336Sbrian if (negate) { 39975336Sbrian n2 = (union node *)stalloc(sizeof (struct nnot)); 40075336Sbrian n2->type = NNOT; 40175336Sbrian n2->nnot.com = n1; 40275336Sbrian return n2; 40375336Sbrian } else 40475336Sbrian return n1; 4051556Srgrimes} 4061556Srgrimes 4071556Srgrimes 4081556Srgrimes 409213811Sobrienstatic union node * 41090111Simpcommand(void) 41190111Simp{ 4121556Srgrimes union node *n1, *n2; 4131556Srgrimes union node *ap, **app; 4141556Srgrimes union node *cp, **cpp; 4151556Srgrimes union node *redir, **rpp; 416214281Sjilles int t; 417218325Sjilles int is_subshell; 4181556Srgrimes 419214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 420218325Sjilles is_subshell = 0; 42117987Speter redir = NULL; 42217987Speter n1 = NULL; 4231556Srgrimes rpp = &redir; 42420425Ssteve 4251556Srgrimes /* Check for redirection which may precede command */ 4261556Srgrimes while (readtoken() == TREDIR) { 4271556Srgrimes *rpp = n2 = redirnode; 4281556Srgrimes rpp = &n2->nfile.next; 4291556Srgrimes parsefname(); 4301556Srgrimes } 4311556Srgrimes tokpushback++; 4321556Srgrimes 4331556Srgrimes switch (readtoken()) { 4341556Srgrimes case TIF: 4351556Srgrimes n1 = (union node *)stalloc(sizeof (struct nif)); 4361556Srgrimes n1->type = NIF; 437255087Sjilles if ((n1->nif.test = list(0)) == NULL) 438104554Stjr synexpect(-1); 439255073Sjilles consumetoken(TTHEN); 440255087Sjilles n1->nif.ifpart = list(0); 4411556Srgrimes n2 = n1; 4421556Srgrimes while (readtoken() == TELIF) { 4431556Srgrimes n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 4441556Srgrimes n2 = n2->nif.elsepart; 4451556Srgrimes n2->type = NIF; 446255087Sjilles if ((n2->nif.test = list(0)) == NULL) 447104554Stjr synexpect(-1); 448255073Sjilles consumetoken(TTHEN); 449255087Sjilles n2->nif.ifpart = list(0); 4501556Srgrimes } 4511556Srgrimes if (lasttoken == TELSE) 452255087Sjilles n2->nif.elsepart = list(0); 4531556Srgrimes else { 4541556Srgrimes n2->nif.elsepart = NULL; 4551556Srgrimes tokpushback++; 4561556Srgrimes } 457255073Sjilles consumetoken(TFI); 458214709Sjilles checkkwd = CHKKWD | CHKALIAS; 4591556Srgrimes break; 4601556Srgrimes case TWHILE: 461255073Sjilles case TUNTIL: 462255085Sjilles t = lasttoken; 463255087Sjilles if ((n1 = list(0)) == NULL) 464104554Stjr synexpect(-1); 465255073Sjilles consumetoken(TDO); 466255087Sjilles n1 = makebinary((t == TWHILE)? NWHILE : NUNTIL, n1, list(0)); 467255073Sjilles consumetoken(TDONE); 468214709Sjilles checkkwd = CHKKWD | CHKALIAS; 4691556Srgrimes break; 4701556Srgrimes case TFOR: 4711556Srgrimes if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 4721556Srgrimes synerror("Bad for loop variable"); 4731556Srgrimes n1 = (union node *)stalloc(sizeof (struct nfor)); 4741556Srgrimes n1->type = NFOR; 4751556Srgrimes n1->nfor.var = wordtext; 476199282Sjilles while (readtoken() == TNL) 477199282Sjilles ; 478199282Sjilles if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) { 4791556Srgrimes app = ≈ 4801556Srgrimes while (readtoken() == TWORD) { 481255081Sjilles n2 = makename(); 4821556Srgrimes *app = n2; 4831556Srgrimes app = &n2->narg.next; 4841556Srgrimes } 4851556Srgrimes *app = NULL; 4861556Srgrimes n1->nfor.args = ap; 4871556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 4881556Srgrimes synexpect(-1); 4891556Srgrimes } else { 490149096Sstefanf static char argvars[5] = { 491149096Sstefanf CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' 492149096Sstefanf }; 4931556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 4941556Srgrimes n2->type = NARG; 495149096Sstefanf n2->narg.text = argvars; 4961556Srgrimes n2->narg.backquote = NULL; 4971556Srgrimes n2->narg.next = NULL; 4981556Srgrimes n1->nfor.args = n2; 4991556Srgrimes /* 5001556Srgrimes * Newline or semicolon here is optional (but note 5011556Srgrimes * that the original Bourne shell only allowed NL). 5021556Srgrimes */ 5031556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 5041556Srgrimes tokpushback++; 5051556Srgrimes } 506214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 5071556Srgrimes if ((t = readtoken()) == TDO) 5081556Srgrimes t = TDONE; 5091556Srgrimes else if (t == TBEGIN) 5101556Srgrimes t = TEND; 5111556Srgrimes else 5121556Srgrimes synexpect(-1); 513255087Sjilles n1->nfor.body = list(0); 514255073Sjilles consumetoken(t); 515214709Sjilles checkkwd = CHKKWD | CHKALIAS; 5161556Srgrimes break; 5171556Srgrimes case TCASE: 5181556Srgrimes n1 = (union node *)stalloc(sizeof (struct ncase)); 5191556Srgrimes n1->type = NCASE; 520255073Sjilles consumetoken(TWORD); 521255081Sjilles n1->ncase.expr = makename(); 5221556Srgrimes while (readtoken() == TNL); 5231556Srgrimes if (lasttoken != TWORD || ! equal(wordtext, "in")) 5241556Srgrimes synerror("expecting \"in\""); 5251556Srgrimes cpp = &n1->ncase.cases; 526214709Sjilles checkkwd = CHKNL | CHKKWD, readtoken(); 527104202Stjr while (lasttoken != TESAC) { 5281556Srgrimes *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 5291556Srgrimes cp->type = NCLIST; 5301556Srgrimes app = &cp->nclist.pattern; 531104207Stjr if (lasttoken == TLP) 532104207Stjr readtoken(); 5331556Srgrimes for (;;) { 534255081Sjilles *app = ap = makename(); 535214709Sjilles checkkwd = CHKNL | CHKKWD; 536214709Sjilles if (readtoken() != TPIPE) 5371556Srgrimes break; 5381556Srgrimes app = &ap->narg.next; 5392760Ssef readtoken(); 5401556Srgrimes } 5411556Srgrimes ap->narg.next = NULL; 5421556Srgrimes if (lasttoken != TRP) 543214709Sjilles synexpect(TRP); 544255087Sjilles cp->nclist.body = list(0); 5452760Ssef 546214709Sjilles checkkwd = CHKNL | CHKKWD | CHKALIAS; 5472760Ssef if ((t = readtoken()) != TESAC) { 548223186Sjilles if (t == TENDCASE) 549223186Sjilles ; 550223186Sjilles else if (t == TFALLTHRU) 551223186Sjilles cp->type = NCLISTFALLTHRU; 552223186Sjilles else 553214709Sjilles synexpect(TENDCASE); 554223186Sjilles checkkwd = CHKNL | CHKKWD, readtoken(); 5552760Ssef } 5561556Srgrimes cpp = &cp->nclist.next; 557104202Stjr } 5581556Srgrimes *cpp = NULL; 559214709Sjilles checkkwd = CHKKWD | CHKALIAS; 5601556Srgrimes break; 5611556Srgrimes case TLP: 5621556Srgrimes n1 = (union node *)stalloc(sizeof (struct nredir)); 5631556Srgrimes n1->type = NSUBSHELL; 564255087Sjilles n1->nredir.n = list(0); 5651556Srgrimes n1->nredir.redirect = NULL; 566255073Sjilles consumetoken(TRP); 567214709Sjilles checkkwd = CHKKWD | CHKALIAS; 568218325Sjilles is_subshell = 1; 5691556Srgrimes break; 5701556Srgrimes case TBEGIN: 571255087Sjilles n1 = list(0); 572255073Sjilles consumetoken(TEND); 573214709Sjilles checkkwd = CHKKWD | CHKALIAS; 5741556Srgrimes break; 575254843Sjilles /* A simple command must have at least one redirection or word. */ 576210221Sjilles case TBACKGND: 57717987Speter case TSEMI: 578101662Stjr case TAND: 579101662Stjr case TOR: 580254335Sjilles case TPIPE: 581254335Sjilles case TENDCASE: 582254335Sjilles case TFALLTHRU: 583254843Sjilles case TEOF: 584254843Sjilles case TNL: 585254843Sjilles case TRP: 58617987Speter if (!redir) 58717987Speter synexpect(-1); 5881556Srgrimes case TWORD: 5891556Srgrimes tokpushback++; 59075160Sbrian n1 = simplecmd(rpp, redir); 591214281Sjilles return n1; 5921556Srgrimes default: 5931556Srgrimes synexpect(-1); 5941556Srgrimes } 5951556Srgrimes 5961556Srgrimes /* Now check for redirection which may follow command */ 5971556Srgrimes while (readtoken() == TREDIR) { 5981556Srgrimes *rpp = n2 = redirnode; 5991556Srgrimes rpp = &n2->nfile.next; 6001556Srgrimes parsefname(); 6011556Srgrimes } 6021556Srgrimes tokpushback++; 6031556Srgrimes *rpp = NULL; 6041556Srgrimes if (redir) { 605218325Sjilles if (!is_subshell) { 6061556Srgrimes n2 = (union node *)stalloc(sizeof (struct nredir)); 6071556Srgrimes n2->type = NREDIR; 6081556Srgrimes n2->nredir.n = n1; 6091556Srgrimes n1 = n2; 6101556Srgrimes } 6111556Srgrimes n1->nredir.redirect = redir; 6121556Srgrimes } 61375160Sbrian 614214281Sjilles return n1; 6151556Srgrimes} 6161556Srgrimes 6171556Srgrimes 618213811Sobrienstatic union node * 61990111Simpsimplecmd(union node **rpp, union node *redir) 62090111Simp{ 6211556Srgrimes union node *args, **app; 6221556Srgrimes union node **orig_rpp = rpp; 623210087Sjilles union node *n = NULL; 624214304Sjilles int special; 625222165Sjilles int savecheckkwd; 6261556Srgrimes 6271556Srgrimes /* If we don't have any redirections already, then we must reset */ 6281556Srgrimes /* rpp to be the address of the local redir variable. */ 6291556Srgrimes if (redir == 0) 6301556Srgrimes rpp = &redir; 6311556Srgrimes 6321556Srgrimes args = NULL; 6331556Srgrimes app = &args; 6348855Srgrimes /* 6351556Srgrimes * We save the incoming value, because we need this for shell 6361556Srgrimes * functions. There can not be a redirect or an argument between 6378855Srgrimes * the function name and the open parenthesis. 6381556Srgrimes */ 6391556Srgrimes orig_rpp = rpp; 6401556Srgrimes 641222165Sjilles savecheckkwd = CHKALIAS; 642222165Sjilles 6431556Srgrimes for (;;) { 644222165Sjilles checkkwd = savecheckkwd; 6451556Srgrimes if (readtoken() == TWORD) { 646255081Sjilles n = makename(); 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 */ 658255073Sjilles consumetoken(TRP); 659179022Sstefanf funclinno = plinno; 660214291Sjilles /* 661214291Sjilles * - Require plain text. 662214291Sjilles * - Functions with '/' cannot be called. 663214534Sjilles * - Reject name=(). 664214534Sjilles * - Reject ksh extended glob patterns. 665214291Sjilles */ 666214291Sjilles if (!noexpand(n->narg.text) || quoteflag || 667214534Sjilles strchr(n->narg.text, '/') || 668214534Sjilles strchr("!%*+-=?@}~", 669214534Sjilles n->narg.text[strlen(n->narg.text) - 1])) 6701556Srgrimes synerror("Bad function name"); 671214291Sjilles rmescapes(n->narg.text); 672214304Sjilles if (find_builtin(n->narg.text, &special) >= 0 && 673214304Sjilles special) 674214304Sjilles synerror("Cannot override a special builtin with a function"); 6751556Srgrimes n->type = NDEFUN; 6761556Srgrimes n->narg.next = command(); 677179022Sstefanf funclinno = 0; 678210087Sjilles return n; 6791556Srgrimes } else { 6801556Srgrimes tokpushback++; 6811556Srgrimes break; 6821556Srgrimes } 6831556Srgrimes } 6841556Srgrimes *app = NULL; 6851556Srgrimes *rpp = NULL; 6861556Srgrimes n = (union node *)stalloc(sizeof (struct ncmd)); 6871556Srgrimes n->type = NCMD; 6881556Srgrimes n->ncmd.args = args; 6891556Srgrimes n->ncmd.redirect = redir; 690210087Sjilles return n; 6911556Srgrimes} 6921556Srgrimes 693213811Sobrienstatic union node * 69490111Simpmakename(void) 69590111Simp{ 69617987Speter union node *n; 6971556Srgrimes 69817987Speter n = (union node *)stalloc(sizeof (struct narg)); 69917987Speter n->type = NARG; 70017987Speter n->narg.next = NULL; 70117987Speter n->narg.text = wordtext; 70217987Speter n->narg.backquote = backquotelist; 70317987Speter return n; 70417987Speter} 70517987Speter 706255085Sjillesstatic union node * 707255085Sjillesmakebinary(int type, union node *n1, union node *n2) 708255085Sjilles{ 709255085Sjilles union node *n; 710255085Sjilles 711255085Sjilles n = (union node *)stalloc(sizeof (struct nbinary)); 712255085Sjilles n->type = type; 713255085Sjilles n->nbinary.ch1 = n1; 714255085Sjilles n->nbinary.ch2 = n2; 715255085Sjilles return (n); 716255085Sjilles} 717255085Sjilles 718213760Sobrienvoid 719262951Sjmmvforcealias(void) 720262951Sjmmv{ 721262951Sjmmv checkkwd |= CHKALIAS; 722262951Sjmmv} 723262951Sjmmv 724262951Sjmmvvoid 725213760Sobrienfixredir(union node *n, const char *text, int err) 72690111Simp{ 72717987Speter TRACE(("Fix redir %s %d\n", text, err)); 72817987Speter if (!err) 72917987Speter n->ndup.vname = NULL; 73017987Speter 73117987Speter if (is_digit(text[0]) && text[1] == '\0') 73217987Speter n->ndup.dupfd = digit_val(text[0]); 73317987Speter else if (text[0] == '-' && text[1] == '\0') 73417987Speter n->ndup.dupfd = -1; 73517987Speter else { 73620425Ssteve 73717987Speter if (err) 73817987Speter synerror("Bad fd number"); 73917987Speter else 74017987Speter n->ndup.vname = makename(); 74117987Speter } 74217987Speter} 74317987Speter 74417987Speter 745213811Sobrienstatic void 74690111Simpparsefname(void) 74790111Simp{ 7481556Srgrimes union node *n = redirnode; 7491556Srgrimes 750255073Sjilles consumetoken(TWORD); 7511556Srgrimes if (n->type == NHERE) { 7521556Srgrimes struct heredoc *here = heredoc; 7531556Srgrimes struct heredoc *p; 7541556Srgrimes int i; 7551556Srgrimes 7561556Srgrimes if (quoteflag == 0) 7571556Srgrimes n->type = NXHERE; 7581556Srgrimes TRACE(("Here document %d\n", n->type)); 7591556Srgrimes if (here->striptabs) { 7601556Srgrimes while (*wordtext == '\t') 7611556Srgrimes wordtext++; 7621556Srgrimes } 7631556Srgrimes if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 7641556Srgrimes synerror("Illegal eof marker for << redirection"); 7651556Srgrimes rmescapes(wordtext); 7661556Srgrimes here->eofmark = wordtext; 7671556Srgrimes here->next = NULL; 7681556Srgrimes if (heredoclist == NULL) 7691556Srgrimes heredoclist = here; 7701556Srgrimes else { 7711556Srgrimes for (p = heredoclist ; p->next ; p = p->next); 7721556Srgrimes p->next = here; 7731556Srgrimes } 7741556Srgrimes } else if (n->type == NTOFD || n->type == NFROMFD) { 77517987Speter fixredir(n, wordtext, 0); 7761556Srgrimes } else { 77717987Speter n->nfile.fname = makename(); 7781556Srgrimes } 7791556Srgrimes} 7801556Srgrimes 7811556Srgrimes 7821556Srgrimes/* 7831556Srgrimes * Input any here documents. 7841556Srgrimes */ 7851556Srgrimes 786213811Sobrienstatic void 78790111Simpparseheredoc(void) 78890111Simp{ 7891556Srgrimes struct heredoc *here; 7901556Srgrimes union node *n; 7911556Srgrimes 7921556Srgrimes while (heredoclist) { 7931556Srgrimes here = heredoclist; 7941556Srgrimes heredoclist = here->next; 7951556Srgrimes if (needprompt) { 7961556Srgrimes setprompt(2); 7971556Srgrimes needprompt = 0; 7981556Srgrimes } 7991556Srgrimes readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 8001556Srgrimes here->eofmark, here->striptabs); 801255081Sjilles n = makename(); 8021556Srgrimes here->here->nhere.doc = n; 8031556Srgrimes } 8041556Srgrimes} 8051556Srgrimes 806213811Sobrienstatic int 80790111Simppeektoken(void) 80890111Simp{ 8091556Srgrimes int t; 8101556Srgrimes 8111556Srgrimes t = readtoken(); 8121556Srgrimes tokpushback++; 8131556Srgrimes return (t); 8141556Srgrimes} 8151556Srgrimes 816213811Sobrienstatic int 81790111Simpreadtoken(void) 81890111Simp{ 8191556Srgrimes int t; 8201556Srgrimes struct alias *ap; 8211556Srgrimes#ifdef DEBUG 8221556Srgrimes int alreadyseen = tokpushback; 8231556Srgrimes#endif 8248855Srgrimes 8251556Srgrimes top: 8261556Srgrimes t = xxreadtoken(); 8271556Srgrimes 828214709Sjilles /* 829214709Sjilles * eat newlines 830214709Sjilles */ 831214709Sjilles if (checkkwd & CHKNL) { 832214709Sjilles while (t == TNL) { 833214709Sjilles parseheredoc(); 834214709Sjilles t = xxreadtoken(); 835214709Sjilles } 836214709Sjilles } 8371556Srgrimes 838214709Sjilles /* 839214709Sjilles * check for keywords and aliases 840214709Sjilles */ 841214709Sjilles if (t == TWORD && !quoteflag) 842214709Sjilles { 843214709Sjilles const char * const *pp; 844214709Sjilles 845214709Sjilles if (checkkwd & CHKKWD) 84698463Sjmallett for (pp = parsekwd; *pp; pp++) { 84720425Ssteve if (**pp == *wordtext && equal(*pp, wordtext)) 84817987Speter { 8491556Srgrimes lasttoken = t = pp - parsekwd + KWDOFFSET; 8501556Srgrimes TRACE(("keyword %s recognized\n", tokname[t])); 8511556Srgrimes goto out; 8521556Srgrimes } 8531556Srgrimes } 854214709Sjilles if (checkkwd & CHKALIAS && 855214709Sjilles (ap = lookupalias(wordtext, 1)) != NULL) { 856214709Sjilles pushstring(ap->val, strlen(ap->val), ap); 857214709Sjilles goto top; 8581556Srgrimes } 859214709Sjilles } 8601556Srgrimesout: 861214709Sjilles if (t != TNOT) 862214709Sjilles checkkwd = 0; 863214709Sjilles 8641556Srgrimes#ifdef DEBUG 8651556Srgrimes if (!alreadyseen) 8661556Srgrimes TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 8671556Srgrimes else 8681556Srgrimes TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 8691556Srgrimes#endif 8701556Srgrimes return (t); 8711556Srgrimes} 8721556Srgrimes 8731556Srgrimes 8741556Srgrimes/* 8751556Srgrimes * Read the next input token. 8761556Srgrimes * If the token is a word, we set backquotelist to the list of cmds in 8771556Srgrimes * backquotes. We set quoteflag to true if any part of the word was 8781556Srgrimes * quoted. 8791556Srgrimes * If the token is TREDIR, then we set redirnode to a structure containing 8801556Srgrimes * the redirection. 8811556Srgrimes * In all cases, the variable startlinno is set to the number of the line 8821556Srgrimes * on which the token starts. 8831556Srgrimes * 8841556Srgrimes * [Change comment: here documents and internal procedures] 8851556Srgrimes * [Readtoken shouldn't have any arguments. Perhaps we should make the 8861556Srgrimes * word parsing code into a separate routine. In this case, readtoken 8871556Srgrimes * doesn't need to have any internal procedures, but parseword does. 8881556Srgrimes * We could also make parseoperator in essence the main routine, and 8891556Srgrimes * have parseword (readtoken1?) handle both words and redirection.] 8901556Srgrimes */ 8911556Srgrimes 8921556Srgrimes#define RETURN(token) return lasttoken = token 8931556Srgrimes 894213811Sobrienstatic int 89590111Simpxxreadtoken(void) 89690111Simp{ 89725230Ssteve int c; 8981556Srgrimes 8991556Srgrimes if (tokpushback) { 9001556Srgrimes tokpushback = 0; 9011556Srgrimes return lasttoken; 9021556Srgrimes } 9031556Srgrimes if (needprompt) { 9041556Srgrimes setprompt(2); 9051556Srgrimes needprompt = 0; 9061556Srgrimes } 9071556Srgrimes startlinno = plinno; 9081556Srgrimes for (;;) { /* until token or start of word found */ 9091556Srgrimes c = pgetc_macro(); 9101556Srgrimes switch (c) { 9111556Srgrimes case ' ': case '\t': 9121556Srgrimes continue; 9131556Srgrimes case '#': 9141556Srgrimes while ((c = pgetc()) != '\n' && c != PEOF); 9151556Srgrimes pungetc(); 9161556Srgrimes continue; 9171556Srgrimes case '\\': 9181556Srgrimes if (pgetc() == '\n') { 9191556Srgrimes startlinno = ++plinno; 9201556Srgrimes if (doprompt) 9211556Srgrimes setprompt(2); 9221556Srgrimes else 9231556Srgrimes setprompt(0); 9241556Srgrimes continue; 9251556Srgrimes } 9261556Srgrimes pungetc(); 9271556Srgrimes goto breakloop; 9281556Srgrimes case '\n': 9291556Srgrimes plinno++; 9301556Srgrimes needprompt = doprompt; 9311556Srgrimes RETURN(TNL); 9321556Srgrimes case PEOF: 9331556Srgrimes RETURN(TEOF); 9341556Srgrimes case '&': 9351556Srgrimes if (pgetc() == '&') 9361556Srgrimes RETURN(TAND); 9371556Srgrimes pungetc(); 9381556Srgrimes RETURN(TBACKGND); 9391556Srgrimes case '|': 9401556Srgrimes if (pgetc() == '|') 9411556Srgrimes RETURN(TOR); 9421556Srgrimes pungetc(); 9431556Srgrimes RETURN(TPIPE); 9441556Srgrimes case ';': 945223186Sjilles c = pgetc(); 946223186Sjilles if (c == ';') 9471556Srgrimes RETURN(TENDCASE); 948223186Sjilles else if (c == '&') 949223186Sjilles RETURN(TFALLTHRU); 9501556Srgrimes pungetc(); 9511556Srgrimes RETURN(TSEMI); 9521556Srgrimes case '(': 9531556Srgrimes RETURN(TLP); 9541556Srgrimes case ')': 9551556Srgrimes RETURN(TRP); 9561556Srgrimes default: 9571556Srgrimes goto breakloop; 9581556Srgrimes } 9591556Srgrimes } 9601556Srgrimesbreakloop: 9611556Srgrimes return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 9621556Srgrimes#undef RETURN 9631556Srgrimes} 9641556Srgrimes 9651556Srgrimes 966213811Sobrien#define MAXNEST_static 8 967206145Sjillesstruct tokenstate 968206145Sjilles{ 969206145Sjilles const char *syntax; /* *SYNTAX */ 970206145Sjilles int parenlevel; /* levels of parentheses in arithmetic */ 971206145Sjilles enum tokenstate_category 972206145Sjilles { 973206145Sjilles TSTATE_TOP, 974206145Sjilles TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */ 975206145Sjilles TSTATE_VAR_NEW, /* other ${var...}, own dquote state */ 976206145Sjilles TSTATE_ARITH 977206145Sjilles } category; 978206145Sjilles}; 979206145Sjilles 980206145Sjilles 981205130Sjilles/* 982205130Sjilles * Called to parse command substitutions. 983205130Sjilles */ 9841556Srgrimes 985213811Sobrienstatic char * 986205130Sjillesparsebackq(char *out, struct nodelist **pbqlist, 987205130Sjilles int oldstyle, int dblquote, int quoted) 988205130Sjilles{ 989205130Sjilles struct nodelist **nlpp; 990205130Sjilles union node *n; 991205130Sjilles char *volatile str; 992205130Sjilles struct jmploc jmploc; 993205130Sjilles struct jmploc *const savehandler = handler; 994248980Sjilles size_t savelen; 995205130Sjilles int saveprompt; 996205130Sjilles const int bq_startlinno = plinno; 997205130Sjilles char *volatile ostr = NULL; 998205130Sjilles struct parsefile *const savetopfile = getcurrentfile(); 999208655Sjilles struct heredoc *const saveheredoclist = heredoclist; 1000208655Sjilles struct heredoc *here; 1001205130Sjilles 1002205130Sjilles str = NULL; 1003205130Sjilles if (setjmp(jmploc.loc)) { 1004205130Sjilles popfilesupto(savetopfile); 1005205130Sjilles if (str) 1006205130Sjilles ckfree(str); 1007205130Sjilles if (ostr) 1008205130Sjilles ckfree(ostr); 1009208655Sjilles heredoclist = saveheredoclist; 1010205130Sjilles handler = savehandler; 1011205130Sjilles if (exception == EXERROR) { 1012205130Sjilles startlinno = bq_startlinno; 1013205130Sjilles synerror("Error in command substitution"); 1014205130Sjilles } 1015205130Sjilles longjmp(handler->loc, 1); 1016205130Sjilles } 1017205130Sjilles INTOFF; 1018205130Sjilles savelen = out - stackblock(); 1019205130Sjilles if (savelen > 0) { 1020205130Sjilles str = ckmalloc(savelen); 1021205130Sjilles memcpy(str, stackblock(), savelen); 1022205130Sjilles } 1023205130Sjilles handler = &jmploc; 1024208655Sjilles heredoclist = NULL; 1025205130Sjilles INTON; 1026205130Sjilles if (oldstyle) { 1027205130Sjilles /* We must read until the closing backquote, giving special 1028205130Sjilles treatment to some slashes, and then push the string and 1029205130Sjilles reread it as input, interpreting it normally. */ 1030205130Sjilles char *oout; 1031205130Sjilles int c; 1032205130Sjilles int olen; 1033205130Sjilles 1034205130Sjilles 1035205130Sjilles STARTSTACKSTR(oout); 1036205130Sjilles for (;;) { 1037205130Sjilles if (needprompt) { 1038205130Sjilles setprompt(2); 1039205130Sjilles needprompt = 0; 1040205130Sjilles } 1041215783Sjilles CHECKSTRSPACE(2, oout); 1042205130Sjilles switch (c = pgetc()) { 1043205130Sjilles case '`': 1044205130Sjilles goto done; 1045205130Sjilles 1046205130Sjilles case '\\': 1047205130Sjilles if ((c = pgetc()) == '\n') { 1048205130Sjilles plinno++; 1049205130Sjilles if (doprompt) 1050205130Sjilles setprompt(2); 1051205130Sjilles else 1052205130Sjilles setprompt(0); 1053205130Sjilles /* 1054205130Sjilles * If eating a newline, avoid putting 1055205130Sjilles * the newline into the new character 1056215783Sjilles * stream (via the USTPUTC after the 1057205130Sjilles * switch). 1058205130Sjilles */ 1059205130Sjilles continue; 1060205130Sjilles } 1061205130Sjilles if (c != '\\' && c != '`' && c != '$' 1062205130Sjilles && (!dblquote || c != '"')) 1063215783Sjilles USTPUTC('\\', oout); 1064205130Sjilles break; 1065205130Sjilles 1066205130Sjilles case '\n': 1067205130Sjilles plinno++; 1068205130Sjilles needprompt = doprompt; 1069205130Sjilles break; 1070205130Sjilles 1071205130Sjilles case PEOF: 1072205130Sjilles startlinno = plinno; 1073205130Sjilles synerror("EOF in backquote substitution"); 1074205130Sjilles break; 1075205130Sjilles 1076205130Sjilles default: 1077205130Sjilles break; 1078205130Sjilles } 1079215783Sjilles USTPUTC(c, oout); 1080205130Sjilles } 1081205130Sjillesdone: 1082215783Sjilles USTPUTC('\0', oout); 1083205130Sjilles olen = oout - stackblock(); 1084205130Sjilles INTOFF; 1085205130Sjilles ostr = ckmalloc(olen); 1086205130Sjilles memcpy(ostr, stackblock(), olen); 1087205130Sjilles setinputstring(ostr, 1); 1088205130Sjilles INTON; 1089205130Sjilles } 1090205130Sjilles nlpp = pbqlist; 1091205130Sjilles while (*nlpp) 1092205130Sjilles nlpp = &(*nlpp)->next; 1093205130Sjilles *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 1094205130Sjilles (*nlpp)->next = NULL; 1095205130Sjilles 1096205130Sjilles if (oldstyle) { 1097205130Sjilles saveprompt = doprompt; 1098205130Sjilles doprompt = 0; 1099205130Sjilles } 1100205130Sjilles 1101255087Sjilles n = list(0); 1102205130Sjilles 1103255087Sjilles if (oldstyle) { 1104255087Sjilles if (peektoken() != TEOF) 1105255087Sjilles synexpect(-1); 1106205130Sjilles doprompt = saveprompt; 1107255087Sjilles } else 1108255073Sjilles consumetoken(TRP); 1109205130Sjilles 1110205130Sjilles (*nlpp)->n = n; 1111205130Sjilles if (oldstyle) { 1112205130Sjilles /* 1113205130Sjilles * Start reading from old file again, ignoring any pushed back 1114205130Sjilles * tokens left from the backquote parsing 1115205130Sjilles */ 1116205130Sjilles popfile(); 1117205130Sjilles tokpushback = 0; 1118205130Sjilles } 1119205130Sjilles STARTSTACKSTR(out); 1120216706Sjilles CHECKSTRSPACE(savelen + 1, out); 1121208655Sjilles INTOFF; 1122205130Sjilles if (str) { 1123205130Sjilles memcpy(out, str, savelen); 1124205130Sjilles STADJUST(savelen, out); 1125205130Sjilles ckfree(str); 1126205130Sjilles str = NULL; 1127205130Sjilles } 1128205130Sjilles if (ostr) { 1129205130Sjilles ckfree(ostr); 1130205130Sjilles ostr = NULL; 1131205130Sjilles } 1132208655Sjilles here = saveheredoclist; 1133208655Sjilles if (here != NULL) { 1134208655Sjilles while (here->next != NULL) 1135208655Sjilles here = here->next; 1136208655Sjilles here->next = heredoclist; 1137208655Sjilles heredoclist = saveheredoclist; 1138208655Sjilles } 1139205130Sjilles handler = savehandler; 1140208655Sjilles INTON; 1141205130Sjilles if (quoted) 1142205130Sjilles USTPUTC(CTLBACKQ | CTLQUOTE, out); 1143205130Sjilles else 1144205130Sjilles USTPUTC(CTLBACKQ, out); 1145205130Sjilles return out; 1146205130Sjilles} 1147205130Sjilles 1148205130Sjilles 11491556Srgrimes/* 1150221513Sjilles * Called to parse a backslash escape sequence inside $'...'. 1151221513Sjilles * The backslash has already been read. 1152221513Sjilles */ 1153221513Sjillesstatic char * 1154221513Sjillesreadcstyleesc(char *out) 1155221513Sjilles{ 1156221513Sjilles int c, v, i, n; 1157221513Sjilles 1158221513Sjilles c = pgetc(); 1159221513Sjilles switch (c) { 1160221513Sjilles case '\0': 1161221513Sjilles synerror("Unterminated quoted string"); 1162221513Sjilles case '\n': 1163221513Sjilles plinno++; 1164221513Sjilles if (doprompt) 1165221513Sjilles setprompt(2); 1166221513Sjilles else 1167221513Sjilles setprompt(0); 1168221513Sjilles return out; 1169221513Sjilles case '\\': 1170221513Sjilles case '\'': 1171221513Sjilles case '"': 1172221513Sjilles v = c; 1173221513Sjilles break; 1174221513Sjilles case 'a': v = '\a'; break; 1175221513Sjilles case 'b': v = '\b'; break; 1176221513Sjilles case 'e': v = '\033'; break; 1177221513Sjilles case 'f': v = '\f'; break; 1178221513Sjilles case 'n': v = '\n'; break; 1179221513Sjilles case 'r': v = '\r'; break; 1180221513Sjilles case 't': v = '\t'; break; 1181221513Sjilles case 'v': v = '\v'; break; 1182221513Sjilles case 'x': 1183221513Sjilles v = 0; 1184221513Sjilles for (;;) { 1185221513Sjilles c = pgetc(); 1186221513Sjilles if (c >= '0' && c <= '9') 1187221513Sjilles v = (v << 4) + c - '0'; 1188221513Sjilles else if (c >= 'A' && c <= 'F') 1189221513Sjilles v = (v << 4) + c - 'A' + 10; 1190221513Sjilles else if (c >= 'a' && c <= 'f') 1191221513Sjilles v = (v << 4) + c - 'a' + 10; 1192221513Sjilles else 1193221513Sjilles break; 1194221513Sjilles } 1195221513Sjilles pungetc(); 1196221513Sjilles break; 1197221513Sjilles case '0': case '1': case '2': case '3': 1198221513Sjilles case '4': case '5': case '6': case '7': 1199221513Sjilles v = c - '0'; 1200221513Sjilles c = pgetc(); 1201221513Sjilles if (c >= '0' && c <= '7') { 1202221513Sjilles v <<= 3; 1203221513Sjilles v += c - '0'; 1204221513Sjilles c = pgetc(); 1205221513Sjilles if (c >= '0' && c <= '7') { 1206221513Sjilles v <<= 3; 1207221513Sjilles v += c - '0'; 1208221513Sjilles } else 1209221513Sjilles pungetc(); 1210221513Sjilles } else 1211221513Sjilles pungetc(); 1212221513Sjilles break; 1213221513Sjilles case 'c': 1214221513Sjilles c = pgetc(); 1215221513Sjilles if (c < 0x3f || c > 0x7a || c == 0x60) 1216221513Sjilles synerror("Bad escape sequence"); 1217221513Sjilles if (c == '\\' && pgetc() != '\\') 1218221513Sjilles synerror("Bad escape sequence"); 1219221513Sjilles if (c == '?') 1220221513Sjilles v = 127; 1221221513Sjilles else 1222221513Sjilles v = c & 0x1f; 1223221513Sjilles break; 1224221513Sjilles case 'u': 1225221513Sjilles case 'U': 1226221513Sjilles n = c == 'U' ? 8 : 4; 1227221513Sjilles v = 0; 1228221513Sjilles for (i = 0; i < n; i++) { 1229221513Sjilles c = pgetc(); 1230221513Sjilles if (c >= '0' && c <= '9') 1231221513Sjilles v = (v << 4) + c - '0'; 1232221513Sjilles else if (c >= 'A' && c <= 'F') 1233221513Sjilles v = (v << 4) + c - 'A' + 10; 1234221513Sjilles else if (c >= 'a' && c <= 'f') 1235221513Sjilles v = (v << 4) + c - 'a' + 10; 1236221513Sjilles else 1237221513Sjilles synerror("Bad escape sequence"); 1238221513Sjilles } 1239221513Sjilles if (v == 0 || (v >= 0xd800 && v <= 0xdfff)) 1240221513Sjilles synerror("Bad escape sequence"); 1241221513Sjilles /* We really need iconv here. */ 1242221669Sjilles if (initial_localeisutf8 && v > 127) { 1243221669Sjilles CHECKSTRSPACE(4, out); 1244221669Sjilles /* 1245221669Sjilles * We cannot use wctomb() as the locale may have 1246221669Sjilles * changed. 1247221669Sjilles */ 1248221669Sjilles if (v <= 0x7ff) { 1249221669Sjilles USTPUTC(0xc0 | v >> 6, out); 1250221669Sjilles USTPUTC(0x80 | (v & 0x3f), out); 1251221669Sjilles return out; 1252221669Sjilles } else if (v <= 0xffff) { 1253221669Sjilles USTPUTC(0xe0 | v >> 12, out); 1254221669Sjilles USTPUTC(0x80 | ((v >> 6) & 0x3f), out); 1255221669Sjilles USTPUTC(0x80 | (v & 0x3f), out); 1256221669Sjilles return out; 1257221669Sjilles } else if (v <= 0x10ffff) { 1258221669Sjilles USTPUTC(0xf0 | v >> 18, out); 1259221669Sjilles USTPUTC(0x80 | ((v >> 12) & 0x3f), out); 1260221669Sjilles USTPUTC(0x80 | ((v >> 6) & 0x3f), out); 1261221669Sjilles USTPUTC(0x80 | (v & 0x3f), out); 1262221669Sjilles return out; 1263221669Sjilles } 1264221669Sjilles } 1265221513Sjilles if (v > 127) 1266221513Sjilles v = '?'; 1267221513Sjilles break; 1268221513Sjilles default: 1269221513Sjilles synerror("Bad escape sequence"); 1270221513Sjilles } 1271221513Sjilles v = (char)v; 1272221513Sjilles /* 1273221513Sjilles * We can't handle NUL bytes. 1274221513Sjilles * POSIX says we should skip till the closing quote. 1275221513Sjilles */ 1276221513Sjilles if (v == '\0') { 1277221513Sjilles while ((c = pgetc()) != '\'') { 1278221513Sjilles if (c == '\\') 1279221513Sjilles c = pgetc(); 1280221513Sjilles if (c == PEOF) 1281221513Sjilles synerror("Unterminated quoted string"); 1282221513Sjilles } 1283221513Sjilles pungetc(); 1284221513Sjilles return out; 1285221513Sjilles } 1286221513Sjilles if (SQSYNTAX[v] == CCTL) 1287221513Sjilles USTPUTC(CTLESC, out); 1288221513Sjilles USTPUTC(v, out); 1289221513Sjilles return out; 1290221513Sjilles} 1291221513Sjilles 1292221513Sjilles 1293221513Sjilles/* 12941556Srgrimes * If eofmark is NULL, read a word or a redirection symbol. If eofmark 12951556Srgrimes * is not NULL, read a here document. In the latter case, eofmark is the 12961556Srgrimes * word which marks the end of the document and striptabs is true if 12971556Srgrimes * leading tabs should be stripped from the document. The argument firstc 12981556Srgrimes * is the first character of the input token or document. 12991556Srgrimes * 13001556Srgrimes * Because C does not have internal subroutines, I have simulated them 13011556Srgrimes * using goto's to implement the subroutine linkage. The following macros 13021556Srgrimes * will run code that appears at the end of readtoken1. 13031556Srgrimes */ 13041556Srgrimes 13051556Srgrimes#define CHECKEND() {goto checkend; checkend_return:;} 13061556Srgrimes#define PARSEREDIR() {goto parseredir; parseredir_return:;} 13071556Srgrimes#define PARSESUB() {goto parsesub; parsesub_return:;} 13081556Srgrimes#define PARSEARITH() {goto parsearith; parsearith_return:;} 13091556Srgrimes 1310213811Sobrienstatic int 1311248980Sjillesreadtoken1(int firstc, char const *initialsyntax, const char *eofmark, 1312248980Sjilles int striptabs) 131390111Simp{ 131417987Speter int c = firstc; 131517987Speter char *out; 13161556Srgrimes int len; 13171556Srgrimes char line[EOFMARKLEN + 1]; 13181556Srgrimes struct nodelist *bqlist; 13191556Srgrimes int quotef; 1320206145Sjilles int newvarnest; 1321206145Sjilles int level; 132254679Scracauer int synentry; 1323213811Sobrien struct tokenstate state_static[MAXNEST_static]; 1324213811Sobrien int maxnest = MAXNEST_static; 1325206145Sjilles struct tokenstate *state = state_static; 1326221513Sjilles int sqiscstyle = 0; 13271556Srgrimes 13281556Srgrimes startlinno = plinno; 13291556Srgrimes quotef = 0; 13301556Srgrimes bqlist = NULL; 1331206145Sjilles newvarnest = 0; 1332206145Sjilles level = 0; 1333206145Sjilles state[level].syntax = initialsyntax; 1334206145Sjilles state[level].parenlevel = 0; 1335206145Sjilles state[level].category = TSTATE_TOP; 13361556Srgrimes 13371556Srgrimes STARTSTACKSTR(out); 13381556Srgrimes loop: { /* for each line, until end of word */ 13391556Srgrimes CHECKEND(); /* set c to PEOF if at end of here document */ 13401556Srgrimes for (;;) { /* until end of line or end of word */ 1341214512Sjilles CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ 134254679Scracauer 1343206145Sjilles synentry = state[level].syntax[c]; 134454679Scracauer 134554679Scracauer switch(synentry) { 13461556Srgrimes case CNL: /* '\n' */ 1347206145Sjilles if (state[level].syntax == BASESYNTAX) 13481556Srgrimes goto endword; /* exit outer loop */ 13491556Srgrimes USTPUTC(c, out); 13501556Srgrimes plinno++; 13511556Srgrimes if (doprompt) 13521556Srgrimes setprompt(2); 13531556Srgrimes else 13541556Srgrimes setprompt(0); 13551556Srgrimes c = pgetc(); 13561556Srgrimes goto loop; /* continue outer loop */ 1357221513Sjilles case CSBACK: 1358221513Sjilles if (sqiscstyle) { 1359221513Sjilles out = readcstyleesc(out); 1360221513Sjilles break; 1361221513Sjilles } 1362221513Sjilles /* FALLTHROUGH */ 13631556Srgrimes case CWORD: 13641556Srgrimes USTPUTC(c, out); 13651556Srgrimes break; 13661556Srgrimes case CCTL: 1367206145Sjilles if (eofmark == NULL || initialsyntax != SQSYNTAX) 13681556Srgrimes USTPUTC(CTLESC, out); 13691556Srgrimes USTPUTC(c, out); 13701556Srgrimes break; 13711556Srgrimes case CBACK: /* backslash */ 13721556Srgrimes c = pgetc(); 13731556Srgrimes if (c == PEOF) { 13741556Srgrimes USTPUTC('\\', out); 13751556Srgrimes pungetc(); 13761556Srgrimes } else if (c == '\n') { 1377160849Syar plinno++; 13781556Srgrimes if (doprompt) 13791556Srgrimes setprompt(2); 13801556Srgrimes else 13811556Srgrimes setprompt(0); 13821556Srgrimes } else { 1383206145Sjilles if (state[level].syntax == DQSYNTAX && 1384206145Sjilles c != '\\' && c != '`' && c != '$' && 1385206145Sjilles (c != '"' || (eofmark != NULL && 1386206145Sjilles newvarnest == 0)) && 1387206145Sjilles (c != '}' || state[level].category != TSTATE_VAR_OLD)) 13881556Srgrimes USTPUTC('\\', out); 1389214512Sjilles if ((eofmark == NULL || 1390214512Sjilles newvarnest > 0) && 1391214512Sjilles state[level].syntax == BASESYNTAX) 1392214512Sjilles USTPUTC(CTLQUOTEMARK, out); 139383675Stegge if (SQSYNTAX[c] == CCTL) 13941556Srgrimes USTPUTC(CTLESC, out); 13951556Srgrimes USTPUTC(c, out); 1396214512Sjilles if ((eofmark == NULL || 1397214512Sjilles newvarnest > 0) && 1398214512Sjilles state[level].syntax == BASESYNTAX && 1399214512Sjilles state[level].category == TSTATE_VAR_OLD) 1400214512Sjilles USTPUTC(CTLQUOTEEND, out); 14011556Srgrimes quotef++; 14021556Srgrimes } 14031556Srgrimes break; 14041556Srgrimes case CSQUOTE: 1405206145Sjilles USTPUTC(CTLQUOTEMARK, out); 1406206145Sjilles state[level].syntax = SQSYNTAX; 1407221513Sjilles sqiscstyle = 0; 14081556Srgrimes break; 14091556Srgrimes case CDQUOTE: 1410206145Sjilles USTPUTC(CTLQUOTEMARK, out); 1411206145Sjilles state[level].syntax = DQSYNTAX; 14121556Srgrimes break; 14131556Srgrimes case CENDQUOTE: 1414206145Sjilles if (eofmark != NULL && newvarnest == 0) 14151556Srgrimes USTPUTC(c, out); 1416206145Sjilles else { 1417214512Sjilles if (state[level].category == TSTATE_VAR_OLD) 1418214512Sjilles USTPUTC(CTLQUOTEEND, out); 1419214305Sjilles state[level].syntax = BASESYNTAX; 14201556Srgrimes quotef++; 14211556Srgrimes } 14221556Srgrimes break; 14231556Srgrimes case CVAR: /* '$' */ 14241556Srgrimes PARSESUB(); /* parse substitution */ 14251556Srgrimes break; 14261556Srgrimes case CENDVAR: /* '}' */ 1427206145Sjilles if (level > 0 && 1428214492Sjilles ((state[level].category == TSTATE_VAR_OLD && 1429214492Sjilles state[level].syntax == 1430214492Sjilles state[level - 1].syntax) || 1431214490Sjilles (state[level].category == TSTATE_VAR_NEW && 1432214490Sjilles state[level].syntax == BASESYNTAX))) { 1433214492Sjilles if (state[level].category == TSTATE_VAR_NEW) 1434206145Sjilles newvarnest--; 1435206145Sjilles level--; 14361556Srgrimes USTPUTC(CTLENDVAR, out); 14371556Srgrimes } else { 14381556Srgrimes USTPUTC(c, out); 14391556Srgrimes } 14401556Srgrimes break; 14411556Srgrimes case CLP: /* '(' in arithmetic */ 1442206145Sjilles state[level].parenlevel++; 14431556Srgrimes USTPUTC(c, out); 14441556Srgrimes break; 14451556Srgrimes case CRP: /* ')' in arithmetic */ 1446206145Sjilles if (state[level].parenlevel > 0) { 14471556Srgrimes USTPUTC(c, out); 1448206145Sjilles --state[level].parenlevel; 14491556Srgrimes } else { 14501556Srgrimes if (pgetc() == ')') { 1451206145Sjilles if (level > 0 && 1452206145Sjilles state[level].category == TSTATE_ARITH) { 1453206145Sjilles level--; 14541556Srgrimes USTPUTC(CTLENDARI, out); 14551556Srgrimes } else 14561556Srgrimes USTPUTC(')', out); 14571556Srgrimes } else { 14588855Srgrimes /* 14591556Srgrimes * unbalanced parens 14601556Srgrimes * (don't 2nd guess - no error) 14611556Srgrimes */ 14621556Srgrimes pungetc(); 14631556Srgrimes USTPUTC(')', out); 14641556Srgrimes } 14651556Srgrimes } 14661556Srgrimes break; 14671556Srgrimes case CBQUOTE: /* '`' */ 1468206145Sjilles out = parsebackq(out, &bqlist, 1, 1469206145Sjilles state[level].syntax == DQSYNTAX && 1470206145Sjilles (eofmark == NULL || newvarnest > 0), 1471206145Sjilles state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX); 14721556Srgrimes break; 14731556Srgrimes case CEOF: 14741556Srgrimes goto endword; /* exit outer loop */ 1475214305Sjilles case CIGN: 1476214305Sjilles break; 14771556Srgrimes default: 1478206145Sjilles if (level == 0) 14791556Srgrimes goto endword; /* exit outer loop */ 14801556Srgrimes USTPUTC(c, out); 14811556Srgrimes } 14821556Srgrimes c = pgetc_macro(); 14831556Srgrimes } 14841556Srgrimes } 14851556Srgrimesendword: 1486206145Sjilles if (state[level].syntax == ARISYNTAX) 14871556Srgrimes synerror("Missing '))'"); 1488206145Sjilles if (state[level].syntax != BASESYNTAX && eofmark == NULL) 14891556Srgrimes synerror("Unterminated quoted string"); 1490206145Sjilles if (state[level].category == TSTATE_VAR_OLD || 1491206145Sjilles state[level].category == TSTATE_VAR_NEW) { 14921556Srgrimes startlinno = plinno; 14931556Srgrimes synerror("Missing '}'"); 14941556Srgrimes } 1495206145Sjilles if (state != state_static) 1496206145Sjilles parser_temp_free_upto(state); 14971556Srgrimes USTPUTC('\0', out); 14981556Srgrimes len = out - stackblock(); 14991556Srgrimes out = stackblock(); 15001556Srgrimes if (eofmark == NULL) { 15011556Srgrimes if ((c == '>' || c == '<') 15021556Srgrimes && quotef == 0 15031556Srgrimes && len <= 2 15041556Srgrimes && (*out == '\0' || is_digit(*out))) { 15051556Srgrimes PARSEREDIR(); 15061556Srgrimes return lasttoken = TREDIR; 15071556Srgrimes } else { 15081556Srgrimes pungetc(); 15091556Srgrimes } 15101556Srgrimes } 15111556Srgrimes quoteflag = quotef; 15121556Srgrimes backquotelist = bqlist; 15131556Srgrimes grabstackblock(len); 15141556Srgrimes wordtext = out; 15151556Srgrimes return lasttoken = TWORD; 15161556Srgrimes/* end of readtoken routine */ 15171556Srgrimes 15181556Srgrimes 15191556Srgrimes/* 15201556Srgrimes * Check to see whether we are at the end of the here document. When this 15211556Srgrimes * is called, c is set to the first character of the next input line. If 15221556Srgrimes * we are at the end of the here document, this routine sets the c to PEOF. 15231556Srgrimes */ 15241556Srgrimes 15251556Srgrimescheckend: { 15261556Srgrimes if (eofmark) { 15271556Srgrimes if (striptabs) { 15281556Srgrimes while (c == '\t') 15291556Srgrimes c = pgetc(); 15301556Srgrimes } 15311556Srgrimes if (c == *eofmark) { 15321556Srgrimes if (pfgets(line, sizeof line) != NULL) { 1533248980Sjilles const char *p, *q; 15341556Srgrimes 15351556Srgrimes p = line; 15361556Srgrimes for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 1537222134Sjilles if ((*p == '\0' || *p == '\n') && *q == '\0') { 15381556Srgrimes c = PEOF; 1539222134Sjilles if (*p == '\n') { 1540222134Sjilles plinno++; 1541222134Sjilles needprompt = doprompt; 1542222134Sjilles } 15431556Srgrimes } else { 15441556Srgrimes pushstring(line, strlen(line), NULL); 15451556Srgrimes } 15461556Srgrimes } 15471556Srgrimes } 15481556Srgrimes } 15491556Srgrimes goto checkend_return; 15501556Srgrimes} 15511556Srgrimes 15521556Srgrimes 15531556Srgrimes/* 15541556Srgrimes * Parse a redirection operator. The variable "out" points to a string 15551556Srgrimes * specifying the fd to be redirected. The variable "c" contains the 15561556Srgrimes * first character of the redirection operator. 15571556Srgrimes */ 15581556Srgrimes 15591556Srgrimesparseredir: { 15601556Srgrimes char fd = *out; 15611556Srgrimes union node *np; 15621556Srgrimes 15631556Srgrimes np = (union node *)stalloc(sizeof (struct nfile)); 15641556Srgrimes if (c == '>') { 15651556Srgrimes np->nfile.fd = 1; 15661556Srgrimes c = pgetc(); 15671556Srgrimes if (c == '>') 15681556Srgrimes np->type = NAPPEND; 15691556Srgrimes else if (c == '&') 15701556Srgrimes np->type = NTOFD; 157196922Stjr else if (c == '|') 157296922Stjr np->type = NCLOBBER; 15731556Srgrimes else { 15741556Srgrimes np->type = NTO; 15751556Srgrimes pungetc(); 15761556Srgrimes } 15771556Srgrimes } else { /* c == '<' */ 15781556Srgrimes np->nfile.fd = 0; 15791556Srgrimes c = pgetc(); 15801556Srgrimes if (c == '<') { 15811556Srgrimes if (sizeof (struct nfile) != sizeof (struct nhere)) { 15821556Srgrimes np = (union node *)stalloc(sizeof (struct nhere)); 15831556Srgrimes np->nfile.fd = 0; 15841556Srgrimes } 15851556Srgrimes np->type = NHERE; 15861556Srgrimes heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 15871556Srgrimes heredoc->here = np; 15881556Srgrimes if ((c = pgetc()) == '-') { 15891556Srgrimes heredoc->striptabs = 1; 15901556Srgrimes } else { 15911556Srgrimes heredoc->striptabs = 0; 15921556Srgrimes pungetc(); 15931556Srgrimes } 15941556Srgrimes } else if (c == '&') 15951556Srgrimes np->type = NFROMFD; 159666612Sbrian else if (c == '>') 159766612Sbrian np->type = NFROMTO; 15981556Srgrimes else { 15991556Srgrimes np->type = NFROM; 16001556Srgrimes pungetc(); 16011556Srgrimes } 16021556Srgrimes } 16031556Srgrimes if (fd != '\0') 16041556Srgrimes np->nfile.fd = digit_val(fd); 16051556Srgrimes redirnode = np; 16061556Srgrimes goto parseredir_return; 16071556Srgrimes} 16081556Srgrimes 16091556Srgrimes 16101556Srgrimes/* 16111556Srgrimes * Parse a substitution. At this point, we have read the dollar sign 16121556Srgrimes * and nothing else. 16131556Srgrimes */ 16141556Srgrimes 16151556Srgrimesparsesub: { 1616179022Sstefanf char buf[10]; 16171556Srgrimes int subtype; 16181556Srgrimes int typeloc; 16191556Srgrimes int flags; 16201556Srgrimes char *p; 16211556Srgrimes static const char types[] = "}-+?="; 1622179022Sstefanf int bracketed_name = 0; /* used to handle ${[0-9]*} variables */ 1623179022Sstefanf int linno; 1624179387Sstefanf int length; 1625219623Sjilles int c1; 16261556Srgrimes 16271556Srgrimes c = pgetc(); 1628221513Sjilles if (c == '(') { /* $(command) or $((arith)) */ 16291556Srgrimes if (pgetc() == '(') { 16301556Srgrimes PARSEARITH(); 16311556Srgrimes } else { 16321556Srgrimes pungetc(); 1633206145Sjilles out = parsebackq(out, &bqlist, 0, 1634206145Sjilles state[level].syntax == DQSYNTAX && 1635206145Sjilles (eofmark == NULL || newvarnest > 0), 1636206145Sjilles state[level].syntax == DQSYNTAX || 1637206145Sjilles state[level].syntax == ARISYNTAX); 16381556Srgrimes } 1639221513Sjilles } else if (c == '{' || is_name(c) || is_special(c)) { 16401556Srgrimes USTPUTC(CTLVAR, out); 16411556Srgrimes typeloc = out - stackblock(); 16421556Srgrimes USTPUTC(VSNORMAL, out); 16431556Srgrimes subtype = VSNORMAL; 1644179022Sstefanf flags = 0; 16451556Srgrimes if (c == '{') { 164618202Speter bracketed_name = 1; 16471556Srgrimes c = pgetc(); 1648219623Sjilles subtype = 0; 16491556Srgrimes } 1650219623Sjillesvarname: 1651149026Sstefanf if (!is_eof(c) && is_name(c)) { 1652179387Sstefanf length = 0; 16531556Srgrimes do { 16541556Srgrimes STPUTC(c, out); 16551556Srgrimes c = pgetc(); 1656179387Sstefanf length++; 1657149026Sstefanf } while (!is_eof(c) && is_in_name(c)); 1658179387Sstefanf if (length == 6 && 1659179387Sstefanf strncmp(out - length, "LINENO", length) == 0) { 1660179022Sstefanf /* Replace the variable name with the 1661179022Sstefanf * current line number. */ 1662179022Sstefanf linno = plinno; 1663179022Sstefanf if (funclinno != 0) 1664179022Sstefanf linno -= funclinno - 1; 1665179022Sstefanf snprintf(buf, sizeof(buf), "%d", linno); 1666179022Sstefanf STADJUST(-6, out); 1667215783Sjilles STPUTS(buf, out); 1668179022Sstefanf flags |= VSLINENO; 1669179022Sstefanf } 167018202Speter } else if (is_digit(c)) { 167118202Speter if (bracketed_name) { 167218202Speter do { 167318202Speter STPUTC(c, out); 167418202Speter c = pgetc(); 167518202Speter } while (is_digit(c)); 167618202Speter } else { 167718202Speter STPUTC(c, out); 167818202Speter c = pgetc(); 167918202Speter } 1680219623Sjilles } else if (is_special(c)) { 1681219623Sjilles c1 = c; 1682219623Sjilles c = pgetc(); 1683219623Sjilles if (subtype == 0 && c1 == '#') { 1684219623Sjilles subtype = VSLENGTH; 1685219623Sjilles if (strchr(types, c) == NULL && c != ':' && 1686219623Sjilles c != '#' && c != '%') 1687219623Sjilles goto varname; 1688219623Sjilles c1 = c; 1689219623Sjilles c = pgetc(); 1690219623Sjilles if (c1 != '}' && c == '}') { 1691219623Sjilles pungetc(); 1692219623Sjilles c = c1; 1693219623Sjilles goto varname; 1694219623Sjilles } 1695219623Sjilles pungetc(); 1696219623Sjilles c = c1; 1697219623Sjilles c1 = '#'; 1698219623Sjilles subtype = 0; 1699219623Sjilles } 1700219623Sjilles USTPUTC(c1, out); 17011556Srgrimes } else { 1702219623Sjilles subtype = VSERROR; 1703219623Sjilles if (c == '}') 1704219623Sjilles pungetc(); 1705219623Sjilles else if (c == '\n' || c == PEOF) 1706219623Sjilles synerror("Unexpected end of line in substitution"); 1707287749Sjilles else if (BASESYNTAX[c] != CCTL) 1708164003Sstefanf USTPUTC(c, out); 17091556Srgrimes } 17101556Srgrimes if (subtype == 0) { 171117987Speter switch (c) { 171217987Speter case ':': 1713179022Sstefanf flags |= VSNUL; 17141556Srgrimes c = pgetc(); 171517987Speter /*FALLTHROUGH*/ 171617987Speter default: 171717987Speter p = strchr(types, c); 1718164003Sstefanf if (p == NULL) { 1719206144Sjilles if (c == '\n' || c == PEOF) 1720206144Sjilles synerror("Unexpected end of line in substitution"); 1721164003Sstefanf if (flags == VSNUL) 1722164003Sstefanf STPUTC(':', out); 1723287749Sjilles if (BASESYNTAX[c] != CCTL) 1724287749Sjilles STPUTC(c, out); 1725164003Sstefanf subtype = VSERROR; 1726164003Sstefanf } else 1727164003Sstefanf subtype = p - types + VSNORMAL; 172817987Speter break; 172917987Speter case '%': 173020425Ssteve case '#': 173117987Speter { 173217987Speter int cc = c; 173317987Speter subtype = c == '#' ? VSTRIMLEFT : 173417987Speter VSTRIMRIGHT; 173517987Speter c = pgetc(); 173617987Speter if (c == cc) 173717987Speter subtype++; 173817987Speter else 173917987Speter pungetc(); 174017987Speter break; 174117987Speter } 17421556Srgrimes } 1743164003Sstefanf } else if (subtype != VSERROR) { 1744221461Sjilles if (subtype == VSLENGTH && c != '}') 1745221461Sjilles subtype = VSERROR; 17461556Srgrimes pungetc(); 17471556Srgrimes } 1748164003Sstefanf STPUTC('=', out); 1749220903Sjilles if (state[level].syntax == DQSYNTAX || 1750220903Sjilles state[level].syntax == ARISYNTAX) 17511556Srgrimes flags |= VSQUOTE; 17521556Srgrimes *(stackblock() + typeloc) = subtype | flags; 1753206145Sjilles if (subtype != VSNORMAL) { 1754206145Sjilles if (level + 1 >= maxnest) { 1755206145Sjilles maxnest *= 2; 1756206145Sjilles if (state == state_static) { 1757206145Sjilles state = parser_temp_alloc( 1758206145Sjilles maxnest * sizeof(*state)); 1759206145Sjilles memcpy(state, state_static, 1760213811Sobrien MAXNEST_static * sizeof(*state)); 1761206145Sjilles } else 1762206145Sjilles state = parser_temp_realloc(state, 1763206145Sjilles maxnest * sizeof(*state)); 1764206145Sjilles } 1765206145Sjilles level++; 1766206145Sjilles state[level].parenlevel = 0; 1767206145Sjilles if (subtype == VSMINUS || subtype == VSPLUS || 1768206145Sjilles subtype == VSQUESTION || subtype == VSASSIGN) { 1769206145Sjilles /* 1770206145Sjilles * For operators that were in the Bourne shell, 1771206145Sjilles * inherit the double-quote state. 1772206145Sjilles */ 1773206145Sjilles state[level].syntax = state[level - 1].syntax; 1774206145Sjilles state[level].category = TSTATE_VAR_OLD; 1775206145Sjilles } else { 1776206145Sjilles /* 1777206145Sjilles * The other operators take a pattern, 1778206145Sjilles * so go to BASESYNTAX. 1779206145Sjilles * Also, ' and " are now special, even 1780206145Sjilles * in here documents. 1781206145Sjilles */ 1782206145Sjilles state[level].syntax = BASESYNTAX; 1783206145Sjilles state[level].category = TSTATE_VAR_NEW; 1784206145Sjilles newvarnest++; 1785206145Sjilles } 1786206145Sjilles } 1787221513Sjilles } else if (c == '\'' && state[level].syntax == BASESYNTAX) { 1788221513Sjilles /* $'cstylequotes' */ 1789221513Sjilles USTPUTC(CTLQUOTEMARK, out); 1790221513Sjilles state[level].syntax = SQSYNTAX; 1791221513Sjilles sqiscstyle = 1; 1792221513Sjilles } else { 1793221513Sjilles USTPUTC('$', out); 1794221513Sjilles pungetc(); 17951556Srgrimes } 17961556Srgrimes goto parsesub_return; 17971556Srgrimes} 17981556Srgrimes 17991556Srgrimes 18001556Srgrimes/* 18011556Srgrimes * Parse an arithmetic expansion (indicate start of one and set state) 18021556Srgrimes */ 18031556Srgrimesparsearith: { 18041556Srgrimes 1805206145Sjilles if (level + 1 >= maxnest) { 1806206145Sjilles maxnest *= 2; 1807206145Sjilles if (state == state_static) { 1808206145Sjilles state = parser_temp_alloc( 1809206145Sjilles maxnest * sizeof(*state)); 1810206145Sjilles memcpy(state, state_static, 1811213811Sobrien MAXNEST_static * sizeof(*state)); 1812206145Sjilles } else 1813206145Sjilles state = parser_temp_realloc(state, 1814206145Sjilles maxnest * sizeof(*state)); 18151556Srgrimes } 1816206145Sjilles level++; 1817206145Sjilles state[level].syntax = ARISYNTAX; 1818206145Sjilles state[level].parenlevel = 0; 1819206145Sjilles state[level].category = TSTATE_ARITH; 1820206145Sjilles USTPUTC(CTLARI, out); 1821206145Sjilles if (state[level - 1].syntax == DQSYNTAX) 1822206145Sjilles USTPUTC('"',out); 1823206145Sjilles else 1824206145Sjilles USTPUTC(' ',out); 18251556Srgrimes goto parsearith_return; 18261556Srgrimes} 18271556Srgrimes 18281556Srgrimes} /* end of readtoken */ 18291556Srgrimes 18301556Srgrimes 18311556Srgrimes/* 18321556Srgrimes * Returns true if the text contains nothing to expand (no dollar signs 18331556Srgrimes * or backquotes). 18341556Srgrimes */ 18351556Srgrimes 1836213811Sobrienstatic int 183790111Simpnoexpand(char *text) 183890111Simp{ 183925230Ssteve char *p; 184025230Ssteve char c; 18411556Srgrimes 18421556Srgrimes p = text; 18431556Srgrimes while ((c = *p++) != '\0') { 184439137Stegge if ( c == CTLQUOTEMARK) 184539137Stegge continue; 18461556Srgrimes if (c == CTLESC) 18471556Srgrimes p++; 184883675Stegge else if (BASESYNTAX[(int)c] == CCTL) 18491556Srgrimes return 0; 18501556Srgrimes } 18511556Srgrimes return 1; 18521556Srgrimes} 18531556Srgrimes 18541556Srgrimes 18551556Srgrimes/* 18561556Srgrimes * Return true if the argument is a legal variable name (a letter or 18571556Srgrimes * underscore followed by zero or more letters, underscores, and digits). 18581556Srgrimes */ 18591556Srgrimes 18601556Srgrimesint 1861200956Sjillesgoodname(const char *name) 186290111Simp{ 1863200956Sjilles const char *p; 18641556Srgrimes 18651556Srgrimes p = name; 18661556Srgrimes if (! is_name(*p)) 18671556Srgrimes return 0; 18681556Srgrimes while (*++p) { 18691556Srgrimes if (! is_in_name(*p)) 18701556Srgrimes return 0; 18711556Srgrimes } 18721556Srgrimes return 1; 18731556Srgrimes} 18741556Srgrimes 18751556Srgrimes 1876222165Sjillesint 1877222165Sjillesisassignment(const char *p) 1878222165Sjilles{ 1879222165Sjilles if (!is_name(*p)) 1880222165Sjilles return 0; 1881222165Sjilles p++; 1882222165Sjilles for (;;) { 1883222165Sjilles if (*p == '=') 1884222165Sjilles return 1; 1885222165Sjilles else if (!is_in_name(*p)) 1886222165Sjilles return 0; 1887222165Sjilles p++; 1888222165Sjilles } 1889222165Sjilles} 1890222165Sjilles 1891222165Sjilles 1892255073Sjillesstatic void 1893255073Sjillesconsumetoken(int token) 1894255073Sjilles{ 1895255073Sjilles if (readtoken() != token) 1896255073Sjilles synexpect(token); 1897255073Sjilles} 1898255073Sjilles 1899255073Sjilles 19001556Srgrimes/* 19011556Srgrimes * Called when an unexpected token is read during the parse. The argument 19021556Srgrimes * is the token that is expected, or -1 if more than one type of token can 19031556Srgrimes * occur at this point. 19041556Srgrimes */ 19051556Srgrimes 1906213811Sobrienstatic void 190790111Simpsynexpect(int token) 190817987Speter{ 19091556Srgrimes char msg[64]; 19101556Srgrimes 19111556Srgrimes if (token >= 0) { 19121556Srgrimes fmtstr(msg, 64, "%s unexpected (expecting %s)", 19131556Srgrimes tokname[lasttoken], tokname[token]); 19141556Srgrimes } else { 19151556Srgrimes fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 19161556Srgrimes } 19171556Srgrimes synerror(msg); 19181556Srgrimes} 19191556Srgrimes 19201556Srgrimes 1921213811Sobrienstatic void 1922201053Sjillessynerror(const char *msg) 192390111Simp{ 19241556Srgrimes if (commandname) 1925201366Sjilles outfmt(out2, "%s: %d: ", commandname, startlinno); 1926201366Sjilles outfmt(out2, "Syntax error: %s\n", msg); 19271556Srgrimes error((char *)NULL); 19281556Srgrimes} 19291556Srgrimes 1930213811Sobrienstatic void 193190111Simpsetprompt(int which) 193290111Simp{ 19331556Srgrimes whichprompt = which; 19341556Srgrimes 193517987Speter#ifndef NO_HISTORY 19361556Srgrimes if (!el) 193717987Speter#endif 1938199629Sjilles { 19391556Srgrimes out2str(getprompt(NULL)); 1940199629Sjilles flushout(out2); 1941199629Sjilles } 19421556Srgrimes} 19431556Srgrimes 19441556Srgrimes/* 19451556Srgrimes * called by editline -- any expansions to the prompt 19461556Srgrimes * should be added here. 19471556Srgrimes */ 19481556Srgrimeschar * 194990111Simpgetprompt(void *unused __unused) 195025905Ssteve{ 1951142845Sobrien static char ps[PROMPTLEN]; 1952142845Sobrien char *fmt; 1953209653Sjilles const char *pwd; 1954209653Sjilles int i, trim; 1955214538Sjilles static char internal_error[] = "??"; 1956142845Sobrien 1957142845Sobrien /* 1958142845Sobrien * Select prompt format. 1959142845Sobrien */ 19601556Srgrimes switch (whichprompt) { 19611556Srgrimes case 0: 1962201053Sjilles fmt = nullstr; 1963142845Sobrien break; 19641556Srgrimes case 1: 1965142845Sobrien fmt = ps1val(); 1966142845Sobrien break; 19671556Srgrimes case 2: 1968142845Sobrien fmt = ps2val(); 1969142845Sobrien break; 19701556Srgrimes default: 1971201053Sjilles return internal_error; 19721556Srgrimes } 1973142845Sobrien 1974142845Sobrien /* 1975142845Sobrien * Format prompt string. 1976142845Sobrien */ 1977301140Struckman for (i = 0; (i < PROMPTLEN - 1) && (*fmt != '\0'); i++, fmt++) 1978142845Sobrien if (*fmt == '\\') 1979142845Sobrien switch (*++fmt) { 1980142845Sobrien 1981142845Sobrien /* 1982142845Sobrien * Hostname. 1983142845Sobrien * 1984142845Sobrien * \h specifies just the local hostname, 1985142845Sobrien * \H specifies fully-qualified hostname. 1986142845Sobrien */ 1987142845Sobrien case 'h': 1988142845Sobrien case 'H': 1989149024Sstefanf ps[i] = '\0'; 1990301140Struckman gethostname(&ps[i], PROMPTLEN - i - 1); 1991301140Struckman ps[PROMPTLEN - 1] = '\0'; 1992142845Sobrien /* Skip to end of hostname. */ 1993142845Sobrien trim = (*fmt == 'h') ? '.' : '\0'; 1994299487Svangyzen while ((ps[i] != '\0') && (ps[i] != trim)) 1995142845Sobrien i++; 1996299487Svangyzen --i; 1997142845Sobrien break; 1998142845Sobrien 1999142845Sobrien /* 2000142845Sobrien * Working directory. 2001142845Sobrien * 2002142845Sobrien * \W specifies just the final component, 2003142845Sobrien * \w specifies the entire path. 2004142845Sobrien */ 2005142845Sobrien case 'W': 2006142845Sobrien case 'w': 2007209653Sjilles pwd = lookupvar("PWD"); 2008299487Svangyzen if (pwd == NULL || *pwd == '\0') 2009209653Sjilles pwd = "?"; 2010209653Sjilles if (*fmt == 'W' && 2011209653Sjilles *pwd == '/' && pwd[1] != '\0') 2012209653Sjilles strlcpy(&ps[i], strrchr(pwd, '/') + 1, 2013209653Sjilles PROMPTLEN - i); 2014209653Sjilles else 2015209653Sjilles strlcpy(&ps[i], pwd, PROMPTLEN - i); 2016142845Sobrien /* Skip to end of path. */ 2017142845Sobrien while (ps[i + 1] != '\0') 2018142845Sobrien i++; 2019142845Sobrien break; 2020142845Sobrien 2021142845Sobrien /* 2022142845Sobrien * Superuser status. 2023142845Sobrien * 2024142845Sobrien * '$' for normal users, '#' for root. 2025142845Sobrien */ 2026142845Sobrien case '$': 2027142845Sobrien ps[i] = (geteuid() != 0) ? '$' : '#'; 2028142845Sobrien break; 2029142845Sobrien 2030142845Sobrien /* 2031142845Sobrien * A literal \. 2032142845Sobrien */ 2033142845Sobrien case '\\': 2034142845Sobrien ps[i] = '\\'; 2035142845Sobrien break; 2036142845Sobrien 2037142845Sobrien /* 2038142845Sobrien * Emit unrecognized formats verbatim. 2039142845Sobrien */ 2040142845Sobrien default: 2041301140Struckman ps[i] = '\\'; 2042301571Struckman if (i < PROMPTLEN - 2) 2043301140Struckman ps[++i] = *fmt; 2044142845Sobrien break; 2045142845Sobrien } 2046142845Sobrien else 2047142845Sobrien ps[i] = *fmt; 2048142845Sobrien ps[i] = '\0'; 2049142845Sobrien return (ps); 20501556Srgrimes} 2051222907Sjilles 2052222907Sjilles 2053222907Sjillesconst char * 2054248980Sjillesexpandstr(const char *ps) 2055222907Sjilles{ 2056222907Sjilles union node n; 2057222907Sjilles struct jmploc jmploc; 2058222907Sjilles struct jmploc *const savehandler = handler; 2059222907Sjilles const int saveprompt = doprompt; 2060222907Sjilles struct parsefile *const savetopfile = getcurrentfile(); 2061222907Sjilles struct parser_temp *const saveparser_temp = parser_temp; 2062222907Sjilles const char *result = NULL; 2063222907Sjilles 2064222907Sjilles if (!setjmp(jmploc.loc)) { 2065222907Sjilles handler = &jmploc; 2066222907Sjilles parser_temp = NULL; 2067222907Sjilles setinputstring(ps, 1); 2068222907Sjilles doprompt = 0; 2069222907Sjilles readtoken1(pgetc(), DQSYNTAX, "\n\n", 0); 2070222907Sjilles if (backquotelist != NULL) 2071222907Sjilles error("Command substitution not allowed here"); 2072222907Sjilles 2073222907Sjilles n.narg.type = NARG; 2074222907Sjilles n.narg.next = NULL; 2075222907Sjilles n.narg.text = wordtext; 2076222907Sjilles n.narg.backquote = backquotelist; 2077222907Sjilles 2078222907Sjilles expandarg(&n, NULL, 0); 2079222907Sjilles result = stackblock(); 2080222907Sjilles INTOFF; 2081222907Sjilles } 2082222907Sjilles handler = savehandler; 2083222907Sjilles doprompt = saveprompt; 2084222907Sjilles popfilesupto(savetopfile); 2085222907Sjilles if (parser_temp != saveparser_temp) { 2086222907Sjilles parser_temp_free_all(); 2087222907Sjilles parser_temp = saveparser_temp; 2088222907Sjilles } 2089222907Sjilles if (result != NULL) { 2090222907Sjilles INTON; 2091222907Sjilles } else if (exception == EXINT) 2092222907Sjilles raise(SIGINT); 2093222907Sjilles return result; 2094222907Sjilles} 2095