parser.c revision 214490
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 214490 2010-10-28 21:51:14Z 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 721556Srgrimes/* values returned by readtoken */ 7317987Speter#include "token.h" 741556Srgrimes 751556Srgrimes 761556Srgrimes 771556Srgrimesstruct heredoc { 781556Srgrimes struct heredoc *next; /* next here document in list */ 791556Srgrimes union node *here; /* redirection node */ 801556Srgrimes char *eofmark; /* string indicating end of input */ 811556Srgrimes int striptabs; /* if set, strip leading tabs */ 821556Srgrimes}; 831556Srgrimes 84206145Sjillesstruct parser_temp { 85206145Sjilles struct parser_temp *next; 86206145Sjilles void *data; 87206145Sjilles}; 881556Srgrimes 891556Srgrimes 90213760Sobrienstatic struct heredoc *heredoclist; /* list of here documents to read */ 91213760Sobrienstatic int doprompt; /* if set, prompt the user */ 92213760Sobrienstatic int needprompt; /* true if interactive and at start of line */ 93213760Sobrienstatic int lasttoken; /* last token read */ 941556SrgrimesMKINIT int tokpushback; /* last token pushed back */ 95213760Sobrienstatic char *wordtext; /* text of last word returned by readtoken */ 961556SrgrimesMKINIT int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ 97213760Sobrienstatic struct nodelist *backquotelist; 98213760Sobrienstatic union node *redirnode; 99213760Sobrienstatic struct heredoc *heredoc; 100213760Sobrienstatic int quoteflag; /* set if (part of) last token was quoted */ 101213760Sobrienstatic int startlinno; /* line # where last token started */ 102213760Sobrienstatic int funclinno; /* line # where the current function started */ 103213760Sobrienstatic struct parser_temp *parser_temp; 1041556Srgrimes 10518018Speter/* XXX When 'noaliases' is set to one, no alias expansion takes place. */ 10618018Speterstatic int noaliases = 0; 1071556Srgrimes 1081556Srgrimes 109213811Sobrienstatic union node *list(int); 110213811Sobrienstatic union node *andor(void); 111213811Sobrienstatic union node *pipeline(void); 112213811Sobrienstatic union node *command(void); 113213811Sobrienstatic union node *simplecmd(union node **, union node *); 114213811Sobrienstatic union node *makename(void); 115213811Sobrienstatic void parsefname(void); 116213811Sobrienstatic void parseheredoc(void); 117213811Sobrienstatic int peektoken(void); 118213811Sobrienstatic int readtoken(void); 119213811Sobrienstatic int xxreadtoken(void); 120213811Sobrienstatic int readtoken1(int, char const *, char *, int); 121213811Sobrienstatic int noexpand(char *); 122213811Sobrienstatic void synexpect(int) __dead2; 123213811Sobrienstatic void synerror(const char *) __dead2; 124213811Sobrienstatic void setprompt(int); 1251556Srgrimes 12617987Speter 127213811Sobrienstatic void * 128206145Sjillesparser_temp_alloc(size_t len) 129206145Sjilles{ 130206145Sjilles struct parser_temp *t; 131206145Sjilles 132206145Sjilles INTOFF; 133206145Sjilles t = ckmalloc(sizeof(*t)); 134206145Sjilles t->data = NULL; 135206145Sjilles t->next = parser_temp; 136206145Sjilles parser_temp = t; 137206145Sjilles t->data = ckmalloc(len); 138206145Sjilles INTON; 139206145Sjilles return t->data; 140206145Sjilles} 141206145Sjilles 142206145Sjilles 143213811Sobrienstatic void * 144206145Sjillesparser_temp_realloc(void *ptr, size_t len) 145206145Sjilles{ 146206145Sjilles struct parser_temp *t; 147206145Sjilles 148206145Sjilles INTOFF; 149206145Sjilles t = parser_temp; 150206145Sjilles if (ptr != t->data) 151206145Sjilles error("bug: parser_temp_realloc misused"); 152206145Sjilles t->data = ckrealloc(t->data, len); 153206145Sjilles INTON; 154206145Sjilles return t->data; 155206145Sjilles} 156206145Sjilles 157206145Sjilles 158213811Sobrienstatic void 159206145Sjillesparser_temp_free_upto(void *ptr) 160206145Sjilles{ 161206145Sjilles struct parser_temp *t; 162206145Sjilles int done = 0; 163206145Sjilles 164206145Sjilles INTOFF; 165206145Sjilles while (parser_temp != NULL && !done) { 166206145Sjilles t = parser_temp; 167206145Sjilles parser_temp = t->next; 168206145Sjilles done = t->data == ptr; 169206145Sjilles ckfree(t->data); 170206145Sjilles ckfree(t); 171206145Sjilles } 172206145Sjilles INTON; 173206145Sjilles if (!done) 174206145Sjilles error("bug: parser_temp_free_upto misused"); 175206145Sjilles} 176206145Sjilles 177206145Sjilles 178213811Sobrienstatic void 179206145Sjillesparser_temp_free_all(void) 180206145Sjilles{ 181206145Sjilles struct parser_temp *t; 182206145Sjilles 183206145Sjilles INTOFF; 184206145Sjilles while (parser_temp != NULL) { 185206145Sjilles t = parser_temp; 186206145Sjilles parser_temp = t->next; 187206145Sjilles ckfree(t->data); 188206145Sjilles ckfree(t); 189206145Sjilles } 190206145Sjilles INTON; 191206145Sjilles} 192206145Sjilles 193206145Sjilles 1941556Srgrimes/* 1951556Srgrimes * Read and parse a command. Returns NEOF on end of file. (NULL is a 1961556Srgrimes * valid parse tree indicating a blank line.) 1971556Srgrimes */ 1981556Srgrimes 1991556Srgrimesunion node * 20090111Simpparsecmd(int interact) 20117987Speter{ 2021556Srgrimes int t; 2031556Srgrimes 204206145Sjilles /* This assumes the parser is not re-entered, 205206145Sjilles * which could happen if we add command substitution on PS1/PS2. 206206145Sjilles */ 207206145Sjilles parser_temp_free_all(); 208208656Sjilles heredoclist = NULL; 209206145Sjilles 21060593Scracauer tokpushback = 0; 2111556Srgrimes doprompt = interact; 2121556Srgrimes if (doprompt) 2131556Srgrimes setprompt(1); 2141556Srgrimes else 2151556Srgrimes setprompt(0); 2161556Srgrimes needprompt = 0; 2171556Srgrimes t = readtoken(); 2181556Srgrimes if (t == TEOF) 2191556Srgrimes return NEOF; 2201556Srgrimes if (t == TNL) 2211556Srgrimes return NULL; 2221556Srgrimes tokpushback++; 2231556Srgrimes return list(1); 2241556Srgrimes} 2251556Srgrimes 2261556Srgrimes 227213811Sobrienstatic union node * 22890111Simplist(int nlflag) 22917987Speter{ 2301556Srgrimes union node *n1, *n2, *n3; 23117987Speter int tok; 2321556Srgrimes 2331556Srgrimes checkkwd = 2; 2341556Srgrimes if (nlflag == 0 && tokendlist[peektoken()]) 2351556Srgrimes return NULL; 23617987Speter n1 = NULL; 2371556Srgrimes for (;;) { 23817987Speter n2 = andor(); 23917987Speter tok = readtoken(); 24017987Speter if (tok == TBACKGND) { 24117987Speter if (n2->type == NCMD || n2->type == NPIPE) { 24217987Speter n2->ncmd.backgnd = 1; 24317987Speter } else if (n2->type == NREDIR) { 24417987Speter n2->type = NBACKGND; 24517987Speter } else { 24617987Speter n3 = (union node *)stalloc(sizeof (struct nredir)); 24717987Speter n3->type = NBACKGND; 24817987Speter n3->nredir.n = n2; 24917987Speter n3->nredir.redirect = NULL; 25017987Speter n2 = n3; 25117987Speter } 25217987Speter } 25317987Speter if (n1 == NULL) { 25417987Speter n1 = n2; 25517987Speter } 25617987Speter else { 25717987Speter n3 = (union node *)stalloc(sizeof (struct nbinary)); 25817987Speter n3->type = NSEMI; 25917987Speter n3->nbinary.ch1 = n1; 26017987Speter n3->nbinary.ch2 = n2; 26117987Speter n1 = n3; 26217987Speter } 26317987Speter switch (tok) { 26413882Sjoerg case TBACKGND: 26517987Speter case TSEMI: 26617987Speter tok = readtoken(); 267102410Scharnier /* FALLTHROUGH */ 2681556Srgrimes case TNL: 26917987Speter if (tok == TNL) { 27017987Speter parseheredoc(); 27117987Speter if (nlflag) 27217987Speter return n1; 273210488Sjilles } else if (tok == TEOF && nlflag) { 274210488Sjilles parseheredoc(); 275210488Sjilles return n1; 27617987Speter } else { 27717987Speter tokpushback++; 27817987Speter } 2791556Srgrimes checkkwd = 2; 2801556Srgrimes if (tokendlist[peektoken()]) 2811556Srgrimes return n1; 2821556Srgrimes break; 2831556Srgrimes case TEOF: 2841556Srgrimes if (heredoclist) 2851556Srgrimes parseheredoc(); 2861556Srgrimes else 2871556Srgrimes pungetc(); /* push back EOF on input */ 2881556Srgrimes return n1; 2891556Srgrimes default: 2901556Srgrimes if (nlflag) 2911556Srgrimes synexpect(-1); 2921556Srgrimes tokpushback++; 2931556Srgrimes return n1; 2941556Srgrimes } 2951556Srgrimes } 2961556Srgrimes} 2971556Srgrimes 2981556Srgrimes 2991556Srgrimes 300213811Sobrienstatic union node * 30190111Simpandor(void) 30290111Simp{ 3031556Srgrimes union node *n1, *n2, *n3; 3041556Srgrimes int t; 3051556Srgrimes 3061556Srgrimes n1 = pipeline(); 3071556Srgrimes for (;;) { 3081556Srgrimes if ((t = readtoken()) == TAND) { 3091556Srgrimes t = NAND; 3101556Srgrimes } else if (t == TOR) { 3111556Srgrimes t = NOR; 3121556Srgrimes } else { 3131556Srgrimes tokpushback++; 3141556Srgrimes return n1; 3151556Srgrimes } 3161556Srgrimes n2 = pipeline(); 3171556Srgrimes n3 = (union node *)stalloc(sizeof (struct nbinary)); 3181556Srgrimes n3->type = t; 3191556Srgrimes n3->nbinary.ch1 = n1; 3201556Srgrimes n3->nbinary.ch2 = n2; 3211556Srgrimes n1 = n3; 3221556Srgrimes } 3231556Srgrimes} 3241556Srgrimes 3251556Srgrimes 3261556Srgrimes 327213811Sobrienstatic union node * 32890111Simppipeline(void) 32990111Simp{ 33075336Sbrian union node *n1, *n2, *pipenode; 3311556Srgrimes struct nodelist *lp, *prev; 332214281Sjilles int negate, t; 3331556Srgrimes 33475336Sbrian negate = 0; 335191009Sstefanf checkkwd = 2; 3361556Srgrimes TRACE(("pipeline: entered\n")); 33775336Sbrian while (readtoken() == TNOT) 33875336Sbrian negate = !negate; 33975336Sbrian tokpushback++; 3401556Srgrimes n1 = command(); 3411556Srgrimes if (readtoken() == TPIPE) { 3421556Srgrimes pipenode = (union node *)stalloc(sizeof (struct npipe)); 3431556Srgrimes pipenode->type = NPIPE; 3441556Srgrimes pipenode->npipe.backgnd = 0; 3451556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 3461556Srgrimes pipenode->npipe.cmdlist = lp; 3471556Srgrimes lp->n = n1; 3481556Srgrimes do { 3491556Srgrimes prev = lp; 3501556Srgrimes lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 351214281Sjilles checkkwd = 2; 352214281Sjilles t = readtoken(); 353214281Sjilles tokpushback++; 354214281Sjilles if (t == TNOT) 355214281Sjilles lp->n = pipeline(); 356214281Sjilles else 357214281Sjilles lp->n = command(); 3581556Srgrimes prev->next = lp; 3591556Srgrimes } while (readtoken() == TPIPE); 3601556Srgrimes lp->next = NULL; 3611556Srgrimes n1 = pipenode; 3621556Srgrimes } 3631556Srgrimes tokpushback++; 36475336Sbrian if (negate) { 36575336Sbrian n2 = (union node *)stalloc(sizeof (struct nnot)); 36675336Sbrian n2->type = NNOT; 36775336Sbrian n2->nnot.com = n1; 36875336Sbrian return n2; 36975336Sbrian } else 37075336Sbrian return n1; 3711556Srgrimes} 3721556Srgrimes 3731556Srgrimes 3741556Srgrimes 375213811Sobrienstatic union node * 37690111Simpcommand(void) 37790111Simp{ 3781556Srgrimes union node *n1, *n2; 3791556Srgrimes union node *ap, **app; 3801556Srgrimes union node *cp, **cpp; 3811556Srgrimes union node *redir, **rpp; 382214281Sjilles int t; 3831556Srgrimes 3841556Srgrimes checkkwd = 2; 38517987Speter redir = NULL; 38617987Speter n1 = NULL; 3871556Srgrimes rpp = &redir; 38820425Ssteve 3891556Srgrimes /* Check for redirection which may precede command */ 3901556Srgrimes while (readtoken() == TREDIR) { 3911556Srgrimes *rpp = n2 = redirnode; 3921556Srgrimes rpp = &n2->nfile.next; 3931556Srgrimes parsefname(); 3941556Srgrimes } 3951556Srgrimes tokpushback++; 3961556Srgrimes 3971556Srgrimes switch (readtoken()) { 3981556Srgrimes case TIF: 3991556Srgrimes n1 = (union node *)stalloc(sizeof (struct nif)); 4001556Srgrimes n1->type = NIF; 401104554Stjr if ((n1->nif.test = list(0)) == NULL) 402104554Stjr synexpect(-1); 4031556Srgrimes if (readtoken() != TTHEN) 4041556Srgrimes synexpect(TTHEN); 4051556Srgrimes n1->nif.ifpart = list(0); 4061556Srgrimes n2 = n1; 4071556Srgrimes while (readtoken() == TELIF) { 4081556Srgrimes n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); 4091556Srgrimes n2 = n2->nif.elsepart; 4101556Srgrimes n2->type = NIF; 411104554Stjr if ((n2->nif.test = list(0)) == NULL) 412104554Stjr synexpect(-1); 4131556Srgrimes if (readtoken() != TTHEN) 4141556Srgrimes synexpect(TTHEN); 4151556Srgrimes n2->nif.ifpart = list(0); 4161556Srgrimes } 4171556Srgrimes if (lasttoken == TELSE) 4181556Srgrimes n2->nif.elsepart = list(0); 4191556Srgrimes else { 4201556Srgrimes n2->nif.elsepart = NULL; 4211556Srgrimes tokpushback++; 4221556Srgrimes } 4231556Srgrimes if (readtoken() != TFI) 4241556Srgrimes synexpect(TFI); 4251556Srgrimes checkkwd = 1; 4261556Srgrimes break; 4271556Srgrimes case TWHILE: 4281556Srgrimes case TUNTIL: { 4291556Srgrimes int got; 4301556Srgrimes n1 = (union node *)stalloc(sizeof (struct nbinary)); 4311556Srgrimes n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; 432104554Stjr if ((n1->nbinary.ch1 = list(0)) == NULL) 433104554Stjr synexpect(-1); 4341556Srgrimes if ((got=readtoken()) != TDO) { 4351556SrgrimesTRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); 4361556Srgrimes synexpect(TDO); 4371556Srgrimes } 4381556Srgrimes n1->nbinary.ch2 = list(0); 4391556Srgrimes if (readtoken() != TDONE) 4401556Srgrimes synexpect(TDONE); 4411556Srgrimes checkkwd = 1; 4421556Srgrimes break; 4431556Srgrimes } 4441556Srgrimes case TFOR: 4451556Srgrimes if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) 4461556Srgrimes synerror("Bad for loop variable"); 4471556Srgrimes n1 = (union node *)stalloc(sizeof (struct nfor)); 4481556Srgrimes n1->type = NFOR; 4491556Srgrimes n1->nfor.var = wordtext; 450199282Sjilles while (readtoken() == TNL) 451199282Sjilles ; 452199282Sjilles if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) { 4531556Srgrimes app = ≈ 4541556Srgrimes while (readtoken() == TWORD) { 4551556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 4561556Srgrimes n2->type = NARG; 4571556Srgrimes n2->narg.text = wordtext; 4581556Srgrimes n2->narg.backquote = backquotelist; 4591556Srgrimes *app = n2; 4601556Srgrimes app = &n2->narg.next; 4611556Srgrimes } 4621556Srgrimes *app = NULL; 4631556Srgrimes n1->nfor.args = ap; 4641556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 4651556Srgrimes synexpect(-1); 4661556Srgrimes } else { 467149096Sstefanf static char argvars[5] = { 468149096Sstefanf CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' 469149096Sstefanf }; 4701556Srgrimes n2 = (union node *)stalloc(sizeof (struct narg)); 4711556Srgrimes n2->type = NARG; 472149096Sstefanf n2->narg.text = argvars; 4731556Srgrimes n2->narg.backquote = NULL; 4741556Srgrimes n2->narg.next = NULL; 4751556Srgrimes n1->nfor.args = n2; 4761556Srgrimes /* 4771556Srgrimes * Newline or semicolon here is optional (but note 4781556Srgrimes * that the original Bourne shell only allowed NL). 4791556Srgrimes */ 4801556Srgrimes if (lasttoken != TNL && lasttoken != TSEMI) 4811556Srgrimes tokpushback++; 4821556Srgrimes } 4831556Srgrimes checkkwd = 2; 4841556Srgrimes if ((t = readtoken()) == TDO) 4851556Srgrimes t = TDONE; 4861556Srgrimes else if (t == TBEGIN) 4871556Srgrimes t = TEND; 4881556Srgrimes else 4891556Srgrimes synexpect(-1); 4901556Srgrimes n1->nfor.body = list(0); 4911556Srgrimes if (readtoken() != t) 4921556Srgrimes synexpect(t); 4931556Srgrimes checkkwd = 1; 4941556Srgrimes break; 4951556Srgrimes case TCASE: 4961556Srgrimes n1 = (union node *)stalloc(sizeof (struct ncase)); 4971556Srgrimes n1->type = NCASE; 4981556Srgrimes if (readtoken() != TWORD) 4991556Srgrimes synexpect(TWORD); 5001556Srgrimes n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); 5011556Srgrimes n2->type = NARG; 5021556Srgrimes n2->narg.text = wordtext; 5031556Srgrimes n2->narg.backquote = backquotelist; 5041556Srgrimes n2->narg.next = NULL; 5051556Srgrimes while (readtoken() == TNL); 5061556Srgrimes if (lasttoken != TWORD || ! equal(wordtext, "in")) 5071556Srgrimes synerror("expecting \"in\""); 5081556Srgrimes cpp = &n1->ncase.cases; 50918018Speter noaliases = 1; /* turn off alias expansion */ 5102760Ssef checkkwd = 2, readtoken(); 511104202Stjr while (lasttoken != TESAC) { 5121556Srgrimes *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); 5131556Srgrimes cp->type = NCLIST; 5141556Srgrimes app = &cp->nclist.pattern; 515104207Stjr if (lasttoken == TLP) 516104207Stjr readtoken(); 5171556Srgrimes for (;;) { 5181556Srgrimes *app = ap = (union node *)stalloc(sizeof (struct narg)); 5191556Srgrimes ap->type = NARG; 5201556Srgrimes ap->narg.text = wordtext; 5211556Srgrimes ap->narg.backquote = backquotelist; 5222760Ssef if (checkkwd = 2, readtoken() != TPIPE) 5231556Srgrimes break; 5241556Srgrimes app = &ap->narg.next; 5252760Ssef readtoken(); 5261556Srgrimes } 5271556Srgrimes ap->narg.next = NULL; 5281556Srgrimes if (lasttoken != TRP) 52918018Speter noaliases = 0, synexpect(TRP); 5301556Srgrimes cp->nclist.body = list(0); 5312760Ssef 5322760Ssef checkkwd = 2; 5332760Ssef if ((t = readtoken()) != TESAC) { 5342760Ssef if (t != TENDCASE) 53518018Speter noaliases = 0, synexpect(TENDCASE); 5362760Ssef else 5372760Ssef checkkwd = 2, readtoken(); 5382760Ssef } 5391556Srgrimes cpp = &cp->nclist.next; 540104202Stjr } 54118018Speter noaliases = 0; /* reset alias expansion */ 5421556Srgrimes *cpp = NULL; 5431556Srgrimes checkkwd = 1; 5441556Srgrimes break; 5451556Srgrimes case TLP: 5461556Srgrimes n1 = (union node *)stalloc(sizeof (struct nredir)); 5471556Srgrimes n1->type = NSUBSHELL; 5481556Srgrimes n1->nredir.n = list(0); 5491556Srgrimes n1->nredir.redirect = NULL; 5501556Srgrimes if (readtoken() != TRP) 5511556Srgrimes synexpect(TRP); 5521556Srgrimes checkkwd = 1; 5531556Srgrimes break; 5541556Srgrimes case TBEGIN: 5551556Srgrimes n1 = list(0); 5561556Srgrimes if (readtoken() != TEND) 5571556Srgrimes synexpect(TEND); 5581556Srgrimes checkkwd = 1; 5591556Srgrimes break; 5601556Srgrimes /* Handle an empty command like other simple commands. */ 561210221Sjilles case TBACKGND: 56217987Speter case TSEMI: 563101662Stjr case TAND: 564101662Stjr case TOR: 56517987Speter /* 56617987Speter * An empty command before a ; doesn't make much sense, and 56717987Speter * should certainly be disallowed in the case of `if ;'. 56817987Speter */ 56917987Speter if (!redir) 57017987Speter synexpect(-1); 5711556Srgrimes case TNL: 57210399Sjoerg case TEOF: 5731556Srgrimes case TWORD: 57417987Speter case TRP: 5751556Srgrimes tokpushback++; 57675160Sbrian n1 = simplecmd(rpp, redir); 577214281Sjilles return n1; 5781556Srgrimes default: 5791556Srgrimes synexpect(-1); 5801556Srgrimes } 5811556Srgrimes 5821556Srgrimes /* Now check for redirection which may follow command */ 5831556Srgrimes while (readtoken() == TREDIR) { 5841556Srgrimes *rpp = n2 = redirnode; 5851556Srgrimes rpp = &n2->nfile.next; 5861556Srgrimes parsefname(); 5871556Srgrimes } 5881556Srgrimes tokpushback++; 5891556Srgrimes *rpp = NULL; 5901556Srgrimes if (redir) { 5911556Srgrimes if (n1->type != NSUBSHELL) { 5921556Srgrimes n2 = (union node *)stalloc(sizeof (struct nredir)); 5931556Srgrimes n2->type = NREDIR; 5941556Srgrimes n2->nredir.n = n1; 5951556Srgrimes n1 = n2; 5961556Srgrimes } 5971556Srgrimes n1->nredir.redirect = redir; 5981556Srgrimes } 59975160Sbrian 600214281Sjilles return n1; 6011556Srgrimes} 6021556Srgrimes 6031556Srgrimes 604213811Sobrienstatic union node * 60590111Simpsimplecmd(union node **rpp, union node *redir) 60690111Simp{ 6071556Srgrimes union node *args, **app; 6081556Srgrimes union node **orig_rpp = rpp; 609210087Sjilles union node *n = NULL; 610214304Sjilles int special; 6111556Srgrimes 6121556Srgrimes /* If we don't have any redirections already, then we must reset */ 6131556Srgrimes /* rpp to be the address of the local redir variable. */ 6141556Srgrimes if (redir == 0) 6151556Srgrimes rpp = &redir; 6161556Srgrimes 6171556Srgrimes args = NULL; 6181556Srgrimes app = &args; 6198855Srgrimes /* 6201556Srgrimes * We save the incoming value, because we need this for shell 6211556Srgrimes * functions. There can not be a redirect or an argument between 6228855Srgrimes * the function name and the open parenthesis. 6231556Srgrimes */ 6241556Srgrimes orig_rpp = rpp; 6251556Srgrimes 6261556Srgrimes for (;;) { 6271556Srgrimes if (readtoken() == TWORD) { 6281556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 6291556Srgrimes n->type = NARG; 6301556Srgrimes n->narg.text = wordtext; 6311556Srgrimes n->narg.backquote = backquotelist; 6321556Srgrimes *app = n; 6331556Srgrimes app = &n->narg.next; 6341556Srgrimes } else if (lasttoken == TREDIR) { 6351556Srgrimes *rpp = n = redirnode; 6361556Srgrimes rpp = &n->nfile.next; 6371556Srgrimes parsefname(); /* read name of redirection file */ 6381556Srgrimes } else if (lasttoken == TLP && app == &args->narg.next 6391556Srgrimes && rpp == orig_rpp) { 6401556Srgrimes /* We have a function */ 6411556Srgrimes if (readtoken() != TRP) 6421556Srgrimes synexpect(TRP); 643179022Sstefanf funclinno = plinno; 644214291Sjilles /* 645214291Sjilles * - Require plain text. 646214291Sjilles * - Functions with '/' cannot be called. 647214291Sjilles */ 648214291Sjilles if (!noexpand(n->narg.text) || quoteflag || 649214291Sjilles strchr(n->narg.text, '/')) 6501556Srgrimes synerror("Bad function name"); 651214291Sjilles rmescapes(n->narg.text); 652214304Sjilles if (find_builtin(n->narg.text, &special) >= 0 && 653214304Sjilles special) 654214304Sjilles synerror("Cannot override a special builtin with a function"); 6551556Srgrimes n->type = NDEFUN; 6561556Srgrimes n->narg.next = command(); 657179022Sstefanf funclinno = 0; 658210087Sjilles return n; 6591556Srgrimes } else { 6601556Srgrimes tokpushback++; 6611556Srgrimes break; 6621556Srgrimes } 6631556Srgrimes } 6641556Srgrimes *app = NULL; 6651556Srgrimes *rpp = NULL; 6661556Srgrimes n = (union node *)stalloc(sizeof (struct ncmd)); 6671556Srgrimes n->type = NCMD; 6681556Srgrimes n->ncmd.backgnd = 0; 6691556Srgrimes n->ncmd.args = args; 6701556Srgrimes n->ncmd.redirect = redir; 671210087Sjilles return n; 6721556Srgrimes} 6731556Srgrimes 674213811Sobrienstatic union node * 67590111Simpmakename(void) 67690111Simp{ 67717987Speter union node *n; 6781556Srgrimes 67917987Speter n = (union node *)stalloc(sizeof (struct narg)); 68017987Speter n->type = NARG; 68117987Speter n->narg.next = NULL; 68217987Speter n->narg.text = wordtext; 68317987Speter n->narg.backquote = backquotelist; 68417987Speter return n; 68517987Speter} 68617987Speter 687213760Sobrienvoid 688213760Sobrienfixredir(union node *n, const char *text, int err) 68990111Simp{ 69017987Speter TRACE(("Fix redir %s %d\n", text, err)); 69117987Speter if (!err) 69217987Speter n->ndup.vname = NULL; 69317987Speter 69417987Speter if (is_digit(text[0]) && text[1] == '\0') 69517987Speter n->ndup.dupfd = digit_val(text[0]); 69617987Speter else if (text[0] == '-' && text[1] == '\0') 69717987Speter n->ndup.dupfd = -1; 69817987Speter else { 69920425Ssteve 70017987Speter if (err) 70117987Speter synerror("Bad fd number"); 70217987Speter else 70317987Speter n->ndup.vname = makename(); 70417987Speter } 70517987Speter} 70617987Speter 70717987Speter 708213811Sobrienstatic void 70990111Simpparsefname(void) 71090111Simp{ 7111556Srgrimes union node *n = redirnode; 7121556Srgrimes 7131556Srgrimes if (readtoken() != TWORD) 7141556Srgrimes synexpect(-1); 7151556Srgrimes if (n->type == NHERE) { 7161556Srgrimes struct heredoc *here = heredoc; 7171556Srgrimes struct heredoc *p; 7181556Srgrimes int i; 7191556Srgrimes 7201556Srgrimes if (quoteflag == 0) 7211556Srgrimes n->type = NXHERE; 7221556Srgrimes TRACE(("Here document %d\n", n->type)); 7231556Srgrimes if (here->striptabs) { 7241556Srgrimes while (*wordtext == '\t') 7251556Srgrimes wordtext++; 7261556Srgrimes } 7271556Srgrimes if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) 7281556Srgrimes synerror("Illegal eof marker for << redirection"); 7291556Srgrimes rmescapes(wordtext); 7301556Srgrimes here->eofmark = wordtext; 7311556Srgrimes here->next = NULL; 7321556Srgrimes if (heredoclist == NULL) 7331556Srgrimes heredoclist = here; 7341556Srgrimes else { 7351556Srgrimes for (p = heredoclist ; p->next ; p = p->next); 7361556Srgrimes p->next = here; 7371556Srgrimes } 7381556Srgrimes } else if (n->type == NTOFD || n->type == NFROMFD) { 73917987Speter fixredir(n, wordtext, 0); 7401556Srgrimes } else { 74117987Speter n->nfile.fname = makename(); 7421556Srgrimes } 7431556Srgrimes} 7441556Srgrimes 7451556Srgrimes 7461556Srgrimes/* 7471556Srgrimes * Input any here documents. 7481556Srgrimes */ 7491556Srgrimes 750213811Sobrienstatic void 75190111Simpparseheredoc(void) 75290111Simp{ 7531556Srgrimes struct heredoc *here; 7541556Srgrimes union node *n; 7551556Srgrimes 7561556Srgrimes while (heredoclist) { 7571556Srgrimes here = heredoclist; 7581556Srgrimes heredoclist = here->next; 7591556Srgrimes if (needprompt) { 7601556Srgrimes setprompt(2); 7611556Srgrimes needprompt = 0; 7621556Srgrimes } 7631556Srgrimes readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, 7641556Srgrimes here->eofmark, here->striptabs); 7651556Srgrimes n = (union node *)stalloc(sizeof (struct narg)); 7661556Srgrimes n->narg.type = NARG; 7671556Srgrimes n->narg.next = NULL; 7681556Srgrimes n->narg.text = wordtext; 7691556Srgrimes n->narg.backquote = backquotelist; 7701556Srgrimes here->here->nhere.doc = n; 7711556Srgrimes } 7721556Srgrimes} 7731556Srgrimes 774213811Sobrienstatic int 77590111Simppeektoken(void) 77690111Simp{ 7771556Srgrimes int t; 7781556Srgrimes 7791556Srgrimes t = readtoken(); 7801556Srgrimes tokpushback++; 7811556Srgrimes return (t); 7821556Srgrimes} 7831556Srgrimes 784213811Sobrienstatic int 78590111Simpreadtoken(void) 78690111Simp{ 7871556Srgrimes int t; 7881556Srgrimes int savecheckkwd = checkkwd; 7891556Srgrimes struct alias *ap; 7901556Srgrimes#ifdef DEBUG 7911556Srgrimes int alreadyseen = tokpushback; 7921556Srgrimes#endif 7938855Srgrimes 7941556Srgrimes top: 7951556Srgrimes t = xxreadtoken(); 7961556Srgrimes 7971556Srgrimes if (checkkwd) { 7981556Srgrimes /* 7991556Srgrimes * eat newlines 8001556Srgrimes */ 8011556Srgrimes if (checkkwd == 2) { 8021556Srgrimes checkkwd = 0; 8031556Srgrimes while (t == TNL) { 8041556Srgrimes parseheredoc(); 8051556Srgrimes t = xxreadtoken(); 8061556Srgrimes } 8071556Srgrimes } else 8081556Srgrimes checkkwd = 0; 8091556Srgrimes /* 8101556Srgrimes * check for keywords and aliases 8111556Srgrimes */ 81220425Ssteve if (t == TWORD && !quoteflag) 81317987Speter { 81498463Sjmallett const char * const *pp; 8151556Srgrimes 81698463Sjmallett for (pp = parsekwd; *pp; pp++) { 81720425Ssteve if (**pp == *wordtext && equal(*pp, wordtext)) 81817987Speter { 8191556Srgrimes lasttoken = t = pp - parsekwd + KWDOFFSET; 8201556Srgrimes TRACE(("keyword %s recognized\n", tokname[t])); 8211556Srgrimes goto out; 8221556Srgrimes } 8231556Srgrimes } 82418018Speter if (noaliases == 0 && 82518018Speter (ap = lookupalias(wordtext, 1)) != NULL) { 8261556Srgrimes pushstring(ap->val, strlen(ap->val), ap); 8271556Srgrimes checkkwd = savecheckkwd; 8281556Srgrimes goto top; 8291556Srgrimes } 8301556Srgrimes } 8311556Srgrimesout: 83275160Sbrian checkkwd = (t == TNOT) ? savecheckkwd : 0; 8331556Srgrimes } 8341556Srgrimes#ifdef DEBUG 8351556Srgrimes if (!alreadyseen) 8361556Srgrimes TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 8371556Srgrimes else 8381556Srgrimes TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); 8391556Srgrimes#endif 8401556Srgrimes return (t); 8411556Srgrimes} 8421556Srgrimes 8431556Srgrimes 8441556Srgrimes/* 8451556Srgrimes * Read the next input token. 8461556Srgrimes * If the token is a word, we set backquotelist to the list of cmds in 8471556Srgrimes * backquotes. We set quoteflag to true if any part of the word was 8481556Srgrimes * quoted. 8491556Srgrimes * If the token is TREDIR, then we set redirnode to a structure containing 8501556Srgrimes * the redirection. 8511556Srgrimes * In all cases, the variable startlinno is set to the number of the line 8521556Srgrimes * on which the token starts. 8531556Srgrimes * 8541556Srgrimes * [Change comment: here documents and internal procedures] 8551556Srgrimes * [Readtoken shouldn't have any arguments. Perhaps we should make the 8561556Srgrimes * word parsing code into a separate routine. In this case, readtoken 8571556Srgrimes * doesn't need to have any internal procedures, but parseword does. 8581556Srgrimes * We could also make parseoperator in essence the main routine, and 8591556Srgrimes * have parseword (readtoken1?) handle both words and redirection.] 8601556Srgrimes */ 8611556Srgrimes 8621556Srgrimes#define RETURN(token) return lasttoken = token 8631556Srgrimes 864213811Sobrienstatic int 86590111Simpxxreadtoken(void) 86690111Simp{ 86725230Ssteve int c; 8681556Srgrimes 8691556Srgrimes if (tokpushback) { 8701556Srgrimes tokpushback = 0; 8711556Srgrimes return lasttoken; 8721556Srgrimes } 8731556Srgrimes if (needprompt) { 8741556Srgrimes setprompt(2); 8751556Srgrimes needprompt = 0; 8761556Srgrimes } 8771556Srgrimes startlinno = plinno; 8781556Srgrimes for (;;) { /* until token or start of word found */ 8791556Srgrimes c = pgetc_macro(); 8801556Srgrimes if (c == ' ' || c == '\t') 8811556Srgrimes continue; /* quick check for white space first */ 8821556Srgrimes switch (c) { 8831556Srgrimes case ' ': case '\t': 8841556Srgrimes continue; 8851556Srgrimes case '#': 8861556Srgrimes while ((c = pgetc()) != '\n' && c != PEOF); 8871556Srgrimes pungetc(); 8881556Srgrimes continue; 8891556Srgrimes case '\\': 8901556Srgrimes if (pgetc() == '\n') { 8911556Srgrimes startlinno = ++plinno; 8921556Srgrimes if (doprompt) 8931556Srgrimes setprompt(2); 8941556Srgrimes else 8951556Srgrimes setprompt(0); 8961556Srgrimes continue; 8971556Srgrimes } 8981556Srgrimes pungetc(); 8991556Srgrimes goto breakloop; 9001556Srgrimes case '\n': 9011556Srgrimes plinno++; 9021556Srgrimes needprompt = doprompt; 9031556Srgrimes RETURN(TNL); 9041556Srgrimes case PEOF: 9051556Srgrimes RETURN(TEOF); 9061556Srgrimes case '&': 9071556Srgrimes if (pgetc() == '&') 9081556Srgrimes RETURN(TAND); 9091556Srgrimes pungetc(); 9101556Srgrimes RETURN(TBACKGND); 9111556Srgrimes case '|': 9121556Srgrimes if (pgetc() == '|') 9131556Srgrimes RETURN(TOR); 9141556Srgrimes pungetc(); 9151556Srgrimes RETURN(TPIPE); 9161556Srgrimes case ';': 9171556Srgrimes if (pgetc() == ';') 9181556Srgrimes RETURN(TENDCASE); 9191556Srgrimes pungetc(); 9201556Srgrimes RETURN(TSEMI); 9211556Srgrimes case '(': 9221556Srgrimes RETURN(TLP); 9231556Srgrimes case ')': 9241556Srgrimes RETURN(TRP); 9251556Srgrimes default: 9261556Srgrimes goto breakloop; 9271556Srgrimes } 9281556Srgrimes } 9291556Srgrimesbreakloop: 9301556Srgrimes return readtoken1(c, BASESYNTAX, (char *)NULL, 0); 9311556Srgrimes#undef RETURN 9321556Srgrimes} 9331556Srgrimes 9341556Srgrimes 935213811Sobrien#define MAXNEST_static 8 936206145Sjillesstruct tokenstate 937206145Sjilles{ 938206145Sjilles const char *syntax; /* *SYNTAX */ 939206145Sjilles int parenlevel; /* levels of parentheses in arithmetic */ 940206145Sjilles enum tokenstate_category 941206145Sjilles { 942206145Sjilles TSTATE_TOP, 943206145Sjilles TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */ 944206145Sjilles TSTATE_VAR_NEW, /* other ${var...}, own dquote state */ 945206145Sjilles TSTATE_ARITH 946206145Sjilles } category; 947206145Sjilles}; 948206145Sjilles 949206145Sjilles 950205130Sjilles/* 951205130Sjilles * Called to parse command substitutions. 952205130Sjilles */ 9531556Srgrimes 954213811Sobrienstatic char * 955205130Sjillesparsebackq(char *out, struct nodelist **pbqlist, 956205130Sjilles int oldstyle, int dblquote, int quoted) 957205130Sjilles{ 958205130Sjilles struct nodelist **nlpp; 959205130Sjilles union node *n; 960205130Sjilles char *volatile str; 961205130Sjilles struct jmploc jmploc; 962205130Sjilles struct jmploc *const savehandler = handler; 963205130Sjilles int savelen; 964205130Sjilles int saveprompt; 965205130Sjilles const int bq_startlinno = plinno; 966205130Sjilles char *volatile ostr = NULL; 967205130Sjilles struct parsefile *const savetopfile = getcurrentfile(); 968208655Sjilles struct heredoc *const saveheredoclist = heredoclist; 969208655Sjilles struct heredoc *here; 970205130Sjilles 971205130Sjilles str = NULL; 972205130Sjilles if (setjmp(jmploc.loc)) { 973205130Sjilles popfilesupto(savetopfile); 974205130Sjilles if (str) 975205130Sjilles ckfree(str); 976205130Sjilles if (ostr) 977205130Sjilles ckfree(ostr); 978208655Sjilles heredoclist = saveheredoclist; 979205130Sjilles handler = savehandler; 980205130Sjilles if (exception == EXERROR) { 981205130Sjilles startlinno = bq_startlinno; 982205130Sjilles synerror("Error in command substitution"); 983205130Sjilles } 984205130Sjilles longjmp(handler->loc, 1); 985205130Sjilles } 986205130Sjilles INTOFF; 987205130Sjilles savelen = out - stackblock(); 988205130Sjilles if (savelen > 0) { 989205130Sjilles str = ckmalloc(savelen); 990205130Sjilles memcpy(str, stackblock(), savelen); 991205130Sjilles } 992205130Sjilles handler = &jmploc; 993208655Sjilles heredoclist = NULL; 994205130Sjilles INTON; 995205130Sjilles if (oldstyle) { 996205130Sjilles /* We must read until the closing backquote, giving special 997205130Sjilles treatment to some slashes, and then push the string and 998205130Sjilles reread it as input, interpreting it normally. */ 999205130Sjilles char *oout; 1000205130Sjilles int c; 1001205130Sjilles int olen; 1002205130Sjilles 1003205130Sjilles 1004205130Sjilles STARTSTACKSTR(oout); 1005205130Sjilles for (;;) { 1006205130Sjilles if (needprompt) { 1007205130Sjilles setprompt(2); 1008205130Sjilles needprompt = 0; 1009205130Sjilles } 1010205130Sjilles switch (c = pgetc()) { 1011205130Sjilles case '`': 1012205130Sjilles goto done; 1013205130Sjilles 1014205130Sjilles case '\\': 1015205130Sjilles if ((c = pgetc()) == '\n') { 1016205130Sjilles plinno++; 1017205130Sjilles if (doprompt) 1018205130Sjilles setprompt(2); 1019205130Sjilles else 1020205130Sjilles setprompt(0); 1021205130Sjilles /* 1022205130Sjilles * If eating a newline, avoid putting 1023205130Sjilles * the newline into the new character 1024205130Sjilles * stream (via the STPUTC after the 1025205130Sjilles * switch). 1026205130Sjilles */ 1027205130Sjilles continue; 1028205130Sjilles } 1029205130Sjilles if (c != '\\' && c != '`' && c != '$' 1030205130Sjilles && (!dblquote || c != '"')) 1031205130Sjilles STPUTC('\\', oout); 1032205130Sjilles break; 1033205130Sjilles 1034205130Sjilles case '\n': 1035205130Sjilles plinno++; 1036205130Sjilles needprompt = doprompt; 1037205130Sjilles break; 1038205130Sjilles 1039205130Sjilles case PEOF: 1040205130Sjilles startlinno = plinno; 1041205130Sjilles synerror("EOF in backquote substitution"); 1042205130Sjilles break; 1043205130Sjilles 1044205130Sjilles default: 1045205130Sjilles break; 1046205130Sjilles } 1047205130Sjilles STPUTC(c, oout); 1048205130Sjilles } 1049205130Sjillesdone: 1050205130Sjilles STPUTC('\0', oout); 1051205130Sjilles olen = oout - stackblock(); 1052205130Sjilles INTOFF; 1053205130Sjilles ostr = ckmalloc(olen); 1054205130Sjilles memcpy(ostr, stackblock(), olen); 1055205130Sjilles setinputstring(ostr, 1); 1056205130Sjilles INTON; 1057205130Sjilles } 1058205130Sjilles nlpp = pbqlist; 1059205130Sjilles while (*nlpp) 1060205130Sjilles nlpp = &(*nlpp)->next; 1061205130Sjilles *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); 1062205130Sjilles (*nlpp)->next = NULL; 1063205130Sjilles 1064205130Sjilles if (oldstyle) { 1065205130Sjilles saveprompt = doprompt; 1066205130Sjilles doprompt = 0; 1067205130Sjilles } 1068205130Sjilles 1069205130Sjilles n = list(0); 1070205130Sjilles 1071205130Sjilles if (oldstyle) 1072205130Sjilles doprompt = saveprompt; 1073205130Sjilles else { 1074205130Sjilles if (readtoken() != TRP) 1075205130Sjilles synexpect(TRP); 1076205130Sjilles } 1077205130Sjilles 1078205130Sjilles (*nlpp)->n = n; 1079205130Sjilles if (oldstyle) { 1080205130Sjilles /* 1081205130Sjilles * Start reading from old file again, ignoring any pushed back 1082205130Sjilles * tokens left from the backquote parsing 1083205130Sjilles */ 1084205130Sjilles popfile(); 1085205130Sjilles tokpushback = 0; 1086205130Sjilles } 1087205130Sjilles while (stackblocksize() <= savelen) 1088205130Sjilles growstackblock(); 1089205130Sjilles STARTSTACKSTR(out); 1090208655Sjilles INTOFF; 1091205130Sjilles if (str) { 1092205130Sjilles memcpy(out, str, savelen); 1093205130Sjilles STADJUST(savelen, out); 1094205130Sjilles ckfree(str); 1095205130Sjilles str = NULL; 1096205130Sjilles } 1097205130Sjilles if (ostr) { 1098205130Sjilles ckfree(ostr); 1099205130Sjilles ostr = NULL; 1100205130Sjilles } 1101208655Sjilles here = saveheredoclist; 1102208655Sjilles if (here != NULL) { 1103208655Sjilles while (here->next != NULL) 1104208655Sjilles here = here->next; 1105208655Sjilles here->next = heredoclist; 1106208655Sjilles heredoclist = saveheredoclist; 1107208655Sjilles } 1108205130Sjilles handler = savehandler; 1109208655Sjilles INTON; 1110205130Sjilles if (quoted) 1111205130Sjilles USTPUTC(CTLBACKQ | CTLQUOTE, out); 1112205130Sjilles else 1113205130Sjilles USTPUTC(CTLBACKQ, out); 1114205130Sjilles return out; 1115205130Sjilles} 1116205130Sjilles 1117205130Sjilles 11181556Srgrimes/* 11191556Srgrimes * If eofmark is NULL, read a word or a redirection symbol. If eofmark 11201556Srgrimes * is not NULL, read a here document. In the latter case, eofmark is the 11211556Srgrimes * word which marks the end of the document and striptabs is true if 11221556Srgrimes * leading tabs should be stripped from the document. The argument firstc 11231556Srgrimes * is the first character of the input token or document. 11241556Srgrimes * 11251556Srgrimes * Because C does not have internal subroutines, I have simulated them 11261556Srgrimes * using goto's to implement the subroutine linkage. The following macros 11271556Srgrimes * will run code that appears at the end of readtoken1. 11281556Srgrimes */ 11291556Srgrimes 11301556Srgrimes#define CHECKEND() {goto checkend; checkend_return:;} 11311556Srgrimes#define PARSEREDIR() {goto parseredir; parseredir_return:;} 11321556Srgrimes#define PARSESUB() {goto parsesub; parsesub_return:;} 11331556Srgrimes#define PARSEARITH() {goto parsearith; parsearith_return:;} 11341556Srgrimes 1135213811Sobrienstatic int 1136206145Sjillesreadtoken1(int firstc, char const *initialsyntax, char *eofmark, int striptabs) 113790111Simp{ 113817987Speter int c = firstc; 113917987Speter char *out; 11401556Srgrimes int len; 11411556Srgrimes char line[EOFMARKLEN + 1]; 11421556Srgrimes struct nodelist *bqlist; 11431556Srgrimes int quotef; 1144206145Sjilles int newvarnest; 1145206145Sjilles int level; 114654679Scracauer int synentry; 1147213811Sobrien struct tokenstate state_static[MAXNEST_static]; 1148213811Sobrien int maxnest = MAXNEST_static; 1149206145Sjilles struct tokenstate *state = state_static; 11501556Srgrimes 11511556Srgrimes startlinno = plinno; 11521556Srgrimes quotef = 0; 11531556Srgrimes bqlist = NULL; 1154206145Sjilles newvarnest = 0; 1155206145Sjilles level = 0; 1156206145Sjilles state[level].syntax = initialsyntax; 1157206145Sjilles state[level].parenlevel = 0; 1158206145Sjilles state[level].category = TSTATE_TOP; 11591556Srgrimes 11601556Srgrimes STARTSTACKSTR(out); 11611556Srgrimes loop: { /* for each line, until end of word */ 11621556Srgrimes CHECKEND(); /* set c to PEOF if at end of here document */ 11631556Srgrimes for (;;) { /* until end of line or end of word */ 11641556Srgrimes CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ 116554679Scracauer 1166206145Sjilles synentry = state[level].syntax[c]; 116754679Scracauer 116854679Scracauer switch(synentry) { 11691556Srgrimes case CNL: /* '\n' */ 1170206145Sjilles if (state[level].syntax == BASESYNTAX) 11711556Srgrimes goto endword; /* exit outer loop */ 11721556Srgrimes USTPUTC(c, out); 11731556Srgrimes plinno++; 11741556Srgrimes if (doprompt) 11751556Srgrimes setprompt(2); 11761556Srgrimes else 11771556Srgrimes setprompt(0); 11781556Srgrimes c = pgetc(); 11791556Srgrimes goto loop; /* continue outer loop */ 11801556Srgrimes case CWORD: 11811556Srgrimes USTPUTC(c, out); 11821556Srgrimes break; 11831556Srgrimes case CCTL: 1184206145Sjilles if (eofmark == NULL || initialsyntax != SQSYNTAX) 11851556Srgrimes USTPUTC(CTLESC, out); 11861556Srgrimes USTPUTC(c, out); 11871556Srgrimes break; 11881556Srgrimes case CBACK: /* backslash */ 11891556Srgrimes c = pgetc(); 11901556Srgrimes if (c == PEOF) { 11911556Srgrimes USTPUTC('\\', out); 11921556Srgrimes pungetc(); 11931556Srgrimes } else if (c == '\n') { 1194160849Syar plinno++; 11951556Srgrimes if (doprompt) 11961556Srgrimes setprompt(2); 11971556Srgrimes else 11981556Srgrimes setprompt(0); 11991556Srgrimes } else { 1200206145Sjilles if (state[level].syntax == DQSYNTAX && 1201206145Sjilles c != '\\' && c != '`' && c != '$' && 1202206145Sjilles (c != '"' || (eofmark != NULL && 1203206145Sjilles newvarnest == 0)) && 1204206145Sjilles (c != '}' || state[level].category != TSTATE_VAR_OLD)) 12051556Srgrimes USTPUTC('\\', out); 120683675Stegge if (SQSYNTAX[c] == CCTL) 12071556Srgrimes USTPUTC(CTLESC, out); 1208206145Sjilles else if (eofmark == NULL || 1209206145Sjilles newvarnest > 0) 121038887Stegge USTPUTC(CTLQUOTEMARK, out); 12111556Srgrimes USTPUTC(c, out); 12121556Srgrimes quotef++; 12131556Srgrimes } 12141556Srgrimes break; 12151556Srgrimes case CSQUOTE: 1216206145Sjilles USTPUTC(CTLQUOTEMARK, out); 1217206145Sjilles state[level].syntax = SQSYNTAX; 12181556Srgrimes break; 12191556Srgrimes case CDQUOTE: 1220206145Sjilles USTPUTC(CTLQUOTEMARK, out); 1221206145Sjilles state[level].syntax = DQSYNTAX; 12221556Srgrimes break; 12231556Srgrimes case CENDQUOTE: 1224206145Sjilles if (eofmark != NULL && newvarnest == 0) 12251556Srgrimes USTPUTC(c, out); 1226206145Sjilles else { 1227214305Sjilles state[level].syntax = BASESYNTAX; 12281556Srgrimes quotef++; 12291556Srgrimes } 12301556Srgrimes break; 12311556Srgrimes case CVAR: /* '$' */ 12321556Srgrimes PARSESUB(); /* parse substitution */ 12331556Srgrimes break; 12341556Srgrimes case CENDVAR: /* '}' */ 1235206145Sjilles if (level > 0 && 1236206145Sjilles (state[level].category == TSTATE_VAR_OLD || 1237214490Sjilles (state[level].category == TSTATE_VAR_NEW && 1238214490Sjilles state[level].syntax == BASESYNTAX))) { 1239206145Sjilles if (state[level].category == TSTATE_VAR_OLD) 1240206145Sjilles state[level - 1].syntax = state[level].syntax; 1241206145Sjilles else 1242206145Sjilles newvarnest--; 1243206145Sjilles level--; 12441556Srgrimes USTPUTC(CTLENDVAR, out); 12451556Srgrimes } else { 12461556Srgrimes USTPUTC(c, out); 12471556Srgrimes } 12481556Srgrimes break; 12491556Srgrimes case CLP: /* '(' in arithmetic */ 1250206145Sjilles state[level].parenlevel++; 12511556Srgrimes USTPUTC(c, out); 12521556Srgrimes break; 12531556Srgrimes case CRP: /* ')' in arithmetic */ 1254206145Sjilles if (state[level].parenlevel > 0) { 12551556Srgrimes USTPUTC(c, out); 1256206145Sjilles --state[level].parenlevel; 12571556Srgrimes } else { 12581556Srgrimes if (pgetc() == ')') { 1259206145Sjilles if (level > 0 && 1260206145Sjilles state[level].category == TSTATE_ARITH) { 1261206145Sjilles level--; 12621556Srgrimes USTPUTC(CTLENDARI, out); 12631556Srgrimes } else 12641556Srgrimes USTPUTC(')', out); 12651556Srgrimes } else { 12668855Srgrimes /* 12671556Srgrimes * unbalanced parens 12681556Srgrimes * (don't 2nd guess - no error) 12691556Srgrimes */ 12701556Srgrimes pungetc(); 12711556Srgrimes USTPUTC(')', out); 12721556Srgrimes } 12731556Srgrimes } 12741556Srgrimes break; 12751556Srgrimes case CBQUOTE: /* '`' */ 1276206145Sjilles out = parsebackq(out, &bqlist, 1, 1277206145Sjilles state[level].syntax == DQSYNTAX && 1278206145Sjilles (eofmark == NULL || newvarnest > 0), 1279206145Sjilles state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX); 12801556Srgrimes break; 12811556Srgrimes case CEOF: 12821556Srgrimes goto endword; /* exit outer loop */ 1283214305Sjilles case CIGN: 1284214305Sjilles break; 12851556Srgrimes default: 1286206145Sjilles if (level == 0) 12871556Srgrimes goto endword; /* exit outer loop */ 12881556Srgrimes USTPUTC(c, out); 12891556Srgrimes } 12901556Srgrimes c = pgetc_macro(); 12911556Srgrimes } 12921556Srgrimes } 12931556Srgrimesendword: 1294206145Sjilles if (state[level].syntax == ARISYNTAX) 12951556Srgrimes synerror("Missing '))'"); 1296206145Sjilles if (state[level].syntax != BASESYNTAX && eofmark == NULL) 12971556Srgrimes synerror("Unterminated quoted string"); 1298206145Sjilles if (state[level].category == TSTATE_VAR_OLD || 1299206145Sjilles state[level].category == TSTATE_VAR_NEW) { 13001556Srgrimes startlinno = plinno; 13011556Srgrimes synerror("Missing '}'"); 13021556Srgrimes } 1303206145Sjilles if (state != state_static) 1304206145Sjilles parser_temp_free_upto(state); 13051556Srgrimes USTPUTC('\0', out); 13061556Srgrimes len = out - stackblock(); 13071556Srgrimes out = stackblock(); 13081556Srgrimes if (eofmark == NULL) { 13091556Srgrimes if ((c == '>' || c == '<') 13101556Srgrimes && quotef == 0 13111556Srgrimes && len <= 2 13121556Srgrimes && (*out == '\0' || is_digit(*out))) { 13131556Srgrimes PARSEREDIR(); 13141556Srgrimes return lasttoken = TREDIR; 13151556Srgrimes } else { 13161556Srgrimes pungetc(); 13171556Srgrimes } 13181556Srgrimes } 13191556Srgrimes quoteflag = quotef; 13201556Srgrimes backquotelist = bqlist; 13211556Srgrimes grabstackblock(len); 13221556Srgrimes wordtext = out; 13231556Srgrimes return lasttoken = TWORD; 13241556Srgrimes/* end of readtoken routine */ 13251556Srgrimes 13261556Srgrimes 13271556Srgrimes/* 13281556Srgrimes * Check to see whether we are at the end of the here document. When this 13291556Srgrimes * is called, c is set to the first character of the next input line. If 13301556Srgrimes * we are at the end of the here document, this routine sets the c to PEOF. 13311556Srgrimes */ 13321556Srgrimes 13331556Srgrimescheckend: { 13341556Srgrimes if (eofmark) { 13351556Srgrimes if (striptabs) { 13361556Srgrimes while (c == '\t') 13371556Srgrimes c = pgetc(); 13381556Srgrimes } 13391556Srgrimes if (c == *eofmark) { 13401556Srgrimes if (pfgets(line, sizeof line) != NULL) { 134125230Ssteve char *p, *q; 13421556Srgrimes 13431556Srgrimes p = line; 13441556Srgrimes for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); 13451556Srgrimes if (*p == '\n' && *q == '\0') { 13461556Srgrimes c = PEOF; 13471556Srgrimes plinno++; 13481556Srgrimes needprompt = doprompt; 13491556Srgrimes } else { 13501556Srgrimes pushstring(line, strlen(line), NULL); 13511556Srgrimes } 13521556Srgrimes } 13531556Srgrimes } 13541556Srgrimes } 13551556Srgrimes goto checkend_return; 13561556Srgrimes} 13571556Srgrimes 13581556Srgrimes 13591556Srgrimes/* 13601556Srgrimes * Parse a redirection operator. The variable "out" points to a string 13611556Srgrimes * specifying the fd to be redirected. The variable "c" contains the 13621556Srgrimes * first character of the redirection operator. 13631556Srgrimes */ 13641556Srgrimes 13651556Srgrimesparseredir: { 13661556Srgrimes char fd = *out; 13671556Srgrimes union node *np; 13681556Srgrimes 13691556Srgrimes np = (union node *)stalloc(sizeof (struct nfile)); 13701556Srgrimes if (c == '>') { 13711556Srgrimes np->nfile.fd = 1; 13721556Srgrimes c = pgetc(); 13731556Srgrimes if (c == '>') 13741556Srgrimes np->type = NAPPEND; 13751556Srgrimes else if (c == '&') 13761556Srgrimes np->type = NTOFD; 137796922Stjr else if (c == '|') 137896922Stjr np->type = NCLOBBER; 13791556Srgrimes else { 13801556Srgrimes np->type = NTO; 13811556Srgrimes pungetc(); 13821556Srgrimes } 13831556Srgrimes } else { /* c == '<' */ 13841556Srgrimes np->nfile.fd = 0; 13851556Srgrimes c = pgetc(); 13861556Srgrimes if (c == '<') { 13871556Srgrimes if (sizeof (struct nfile) != sizeof (struct nhere)) { 13881556Srgrimes np = (union node *)stalloc(sizeof (struct nhere)); 13891556Srgrimes np->nfile.fd = 0; 13901556Srgrimes } 13911556Srgrimes np->type = NHERE; 13921556Srgrimes heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); 13931556Srgrimes heredoc->here = np; 13941556Srgrimes if ((c = pgetc()) == '-') { 13951556Srgrimes heredoc->striptabs = 1; 13961556Srgrimes } else { 13971556Srgrimes heredoc->striptabs = 0; 13981556Srgrimes pungetc(); 13991556Srgrimes } 14001556Srgrimes } else if (c == '&') 14011556Srgrimes np->type = NFROMFD; 140266612Sbrian else if (c == '>') 140366612Sbrian np->type = NFROMTO; 14041556Srgrimes else { 14051556Srgrimes np->type = NFROM; 14061556Srgrimes pungetc(); 14071556Srgrimes } 14081556Srgrimes } 14091556Srgrimes if (fd != '\0') 14101556Srgrimes np->nfile.fd = digit_val(fd); 14111556Srgrimes redirnode = np; 14121556Srgrimes goto parseredir_return; 14131556Srgrimes} 14141556Srgrimes 14151556Srgrimes 14161556Srgrimes/* 14171556Srgrimes * Parse a substitution. At this point, we have read the dollar sign 14181556Srgrimes * and nothing else. 14191556Srgrimes */ 14201556Srgrimes 14211556Srgrimesparsesub: { 1422179022Sstefanf char buf[10]; 14231556Srgrimes int subtype; 14241556Srgrimes int typeloc; 14251556Srgrimes int flags; 14261556Srgrimes char *p; 14271556Srgrimes static const char types[] = "}-+?="; 1428179022Sstefanf int bracketed_name = 0; /* used to handle ${[0-9]*} variables */ 1429179022Sstefanf int i; 1430179022Sstefanf int linno; 1431179387Sstefanf int length; 14321556Srgrimes 14331556Srgrimes c = pgetc(); 1434149026Sstefanf if (c != '(' && c != '{' && (is_eof(c) || !is_name(c)) && 1435149026Sstefanf !is_special(c)) { 14361556Srgrimes USTPUTC('$', out); 14371556Srgrimes pungetc(); 14381556Srgrimes } else if (c == '(') { /* $(command) or $((arith)) */ 14391556Srgrimes if (pgetc() == '(') { 14401556Srgrimes PARSEARITH(); 14411556Srgrimes } else { 14421556Srgrimes pungetc(); 1443206145Sjilles out = parsebackq(out, &bqlist, 0, 1444206145Sjilles state[level].syntax == DQSYNTAX && 1445206145Sjilles (eofmark == NULL || newvarnest > 0), 1446206145Sjilles state[level].syntax == DQSYNTAX || 1447206145Sjilles state[level].syntax == ARISYNTAX); 14481556Srgrimes } 14491556Srgrimes } else { 14501556Srgrimes USTPUTC(CTLVAR, out); 14511556Srgrimes typeloc = out - stackblock(); 14521556Srgrimes USTPUTC(VSNORMAL, out); 14531556Srgrimes subtype = VSNORMAL; 1454179022Sstefanf flags = 0; 14551556Srgrimes if (c == '{') { 145618202Speter bracketed_name = 1; 14571556Srgrimes c = pgetc(); 145817987Speter if (c == '#') { 145917987Speter if ((c = pgetc()) == '}') 146017987Speter c = '#'; 146117987Speter else 146217987Speter subtype = VSLENGTH; 146317987Speter } 146417987Speter else 146517987Speter subtype = 0; 14661556Srgrimes } 1467149026Sstefanf if (!is_eof(c) && is_name(c)) { 1468179387Sstefanf length = 0; 14691556Srgrimes do { 14701556Srgrimes STPUTC(c, out); 14711556Srgrimes c = pgetc(); 1472179387Sstefanf length++; 1473149026Sstefanf } while (!is_eof(c) && is_in_name(c)); 1474179387Sstefanf if (length == 6 && 1475179387Sstefanf strncmp(out - length, "LINENO", length) == 0) { 1476179022Sstefanf /* Replace the variable name with the 1477179022Sstefanf * current line number. */ 1478179022Sstefanf linno = plinno; 1479179022Sstefanf if (funclinno != 0) 1480179022Sstefanf linno -= funclinno - 1; 1481179022Sstefanf snprintf(buf, sizeof(buf), "%d", linno); 1482179022Sstefanf STADJUST(-6, out); 1483179022Sstefanf for (i = 0; buf[i] != '\0'; i++) 1484179022Sstefanf STPUTC(buf[i], out); 1485179022Sstefanf flags |= VSLINENO; 1486179022Sstefanf } 148718202Speter } else if (is_digit(c)) { 148818202Speter if (bracketed_name) { 148918202Speter do { 149018202Speter STPUTC(c, out); 149118202Speter c = pgetc(); 149218202Speter } while (is_digit(c)); 149318202Speter } else { 149418202Speter STPUTC(c, out); 149518202Speter c = pgetc(); 149618202Speter } 14971556Srgrimes } else { 1498164003Sstefanf if (! is_special(c)) { 1499164003Sstefanf subtype = VSERROR; 1500164003Sstefanf if (c == '}') 1501164003Sstefanf pungetc(); 1502206144Sjilles else if (c == '\n' || c == PEOF) 1503206144Sjilles synerror("Unexpected end of line in substitution"); 1504164003Sstefanf else 1505164003Sstefanf USTPUTC(c, out); 1506164003Sstefanf } else { 1507164003Sstefanf USTPUTC(c, out); 1508164003Sstefanf c = pgetc(); 1509164003Sstefanf } 15101556Srgrimes } 15111556Srgrimes if (subtype == 0) { 151217987Speter switch (c) { 151317987Speter case ':': 1514179022Sstefanf flags |= VSNUL; 15151556Srgrimes c = pgetc(); 151617987Speter /*FALLTHROUGH*/ 151717987Speter default: 151817987Speter p = strchr(types, c); 1519164003Sstefanf if (p == NULL) { 1520206144Sjilles if (c == '\n' || c == PEOF) 1521206144Sjilles synerror("Unexpected end of line in substitution"); 1522164003Sstefanf if (flags == VSNUL) 1523164003Sstefanf STPUTC(':', out); 1524164003Sstefanf STPUTC(c, out); 1525164003Sstefanf subtype = VSERROR; 1526164003Sstefanf } else 1527164003Sstefanf subtype = p - types + VSNORMAL; 152817987Speter break; 152917987Speter case '%': 153020425Ssteve case '#': 153117987Speter { 153217987Speter int cc = c; 153317987Speter subtype = c == '#' ? VSTRIMLEFT : 153417987Speter VSTRIMRIGHT; 153517987Speter c = pgetc(); 153617987Speter if (c == cc) 153717987Speter subtype++; 153817987Speter else 153917987Speter pungetc(); 154017987Speter break; 154117987Speter } 15421556Srgrimes } 1543164003Sstefanf } else if (subtype != VSERROR) { 15441556Srgrimes pungetc(); 15451556Srgrimes } 1546164003Sstefanf STPUTC('=', out); 1547206145Sjilles if (subtype != VSLENGTH && (state[level].syntax == DQSYNTAX || 1548206145Sjilles state[level].syntax == ARISYNTAX)) 15491556Srgrimes flags |= VSQUOTE; 15501556Srgrimes *(stackblock() + typeloc) = subtype | flags; 1551206145Sjilles if (subtype != VSNORMAL) { 1552206145Sjilles if (level + 1 >= maxnest) { 1553206145Sjilles maxnest *= 2; 1554206145Sjilles if (state == state_static) { 1555206145Sjilles state = parser_temp_alloc( 1556206145Sjilles maxnest * sizeof(*state)); 1557206145Sjilles memcpy(state, state_static, 1558213811Sobrien MAXNEST_static * sizeof(*state)); 1559206145Sjilles } else 1560206145Sjilles state = parser_temp_realloc(state, 1561206145Sjilles maxnest * sizeof(*state)); 1562206145Sjilles } 1563206145Sjilles level++; 1564206145Sjilles state[level].parenlevel = 0; 1565206145Sjilles if (subtype == VSMINUS || subtype == VSPLUS || 1566206145Sjilles subtype == VSQUESTION || subtype == VSASSIGN) { 1567206145Sjilles /* 1568206145Sjilles * For operators that were in the Bourne shell, 1569206145Sjilles * inherit the double-quote state. 1570206145Sjilles */ 1571206145Sjilles state[level].syntax = state[level - 1].syntax; 1572206145Sjilles state[level].category = TSTATE_VAR_OLD; 1573206145Sjilles } else { 1574206145Sjilles /* 1575206145Sjilles * The other operators take a pattern, 1576206145Sjilles * so go to BASESYNTAX. 1577206145Sjilles * Also, ' and " are now special, even 1578206145Sjilles * in here documents. 1579206145Sjilles */ 1580206145Sjilles state[level].syntax = BASESYNTAX; 1581206145Sjilles state[level].category = TSTATE_VAR_NEW; 1582206145Sjilles newvarnest++; 1583206145Sjilles } 1584206145Sjilles } 15851556Srgrimes } 15861556Srgrimes goto parsesub_return; 15871556Srgrimes} 15881556Srgrimes 15891556Srgrimes 15901556Srgrimes/* 15911556Srgrimes * Parse an arithmetic expansion (indicate start of one and set state) 15921556Srgrimes */ 15931556Srgrimesparsearith: { 15941556Srgrimes 1595206145Sjilles if (level + 1 >= maxnest) { 1596206145Sjilles maxnest *= 2; 1597206145Sjilles if (state == state_static) { 1598206145Sjilles state = parser_temp_alloc( 1599206145Sjilles maxnest * sizeof(*state)); 1600206145Sjilles memcpy(state, state_static, 1601213811Sobrien MAXNEST_static * sizeof(*state)); 1602206145Sjilles } else 1603206145Sjilles state = parser_temp_realloc(state, 1604206145Sjilles maxnest * sizeof(*state)); 16051556Srgrimes } 1606206145Sjilles level++; 1607206145Sjilles state[level].syntax = ARISYNTAX; 1608206145Sjilles state[level].parenlevel = 0; 1609206145Sjilles state[level].category = TSTATE_ARITH; 1610206145Sjilles USTPUTC(CTLARI, out); 1611206145Sjilles if (state[level - 1].syntax == DQSYNTAX) 1612206145Sjilles USTPUTC('"',out); 1613206145Sjilles else 1614206145Sjilles USTPUTC(' ',out); 16151556Srgrimes goto parsearith_return; 16161556Srgrimes} 16171556Srgrimes 16181556Srgrimes} /* end of readtoken */ 16191556Srgrimes 16201556Srgrimes 16211556Srgrimes 16221556Srgrimes#ifdef mkinit 16231556SrgrimesRESET { 16241556Srgrimes tokpushback = 0; 16251556Srgrimes checkkwd = 0; 16261556Srgrimes} 16271556Srgrimes#endif 16281556Srgrimes 16291556Srgrimes/* 16301556Srgrimes * Returns true if the text contains nothing to expand (no dollar signs 16311556Srgrimes * or backquotes). 16321556Srgrimes */ 16331556Srgrimes 1634213811Sobrienstatic int 163590111Simpnoexpand(char *text) 163690111Simp{ 163725230Ssteve char *p; 163825230Ssteve char c; 16391556Srgrimes 16401556Srgrimes p = text; 16411556Srgrimes while ((c = *p++) != '\0') { 164239137Stegge if ( c == CTLQUOTEMARK) 164339137Stegge continue; 16441556Srgrimes if (c == CTLESC) 16451556Srgrimes p++; 164683675Stegge else if (BASESYNTAX[(int)c] == CCTL) 16471556Srgrimes return 0; 16481556Srgrimes } 16491556Srgrimes return 1; 16501556Srgrimes} 16511556Srgrimes 16521556Srgrimes 16531556Srgrimes/* 16541556Srgrimes * Return true if the argument is a legal variable name (a letter or 16551556Srgrimes * underscore followed by zero or more letters, underscores, and digits). 16561556Srgrimes */ 16571556Srgrimes 16581556Srgrimesint 1659200956Sjillesgoodname(const char *name) 166090111Simp{ 1661200956Sjilles const char *p; 16621556Srgrimes 16631556Srgrimes p = name; 16641556Srgrimes if (! is_name(*p)) 16651556Srgrimes return 0; 16661556Srgrimes while (*++p) { 16671556Srgrimes if (! is_in_name(*p)) 16681556Srgrimes return 0; 16691556Srgrimes } 16701556Srgrimes return 1; 16711556Srgrimes} 16721556Srgrimes 16731556Srgrimes 16741556Srgrimes/* 16751556Srgrimes * Called when an unexpected token is read during the parse. The argument 16761556Srgrimes * is the token that is expected, or -1 if more than one type of token can 16771556Srgrimes * occur at this point. 16781556Srgrimes */ 16791556Srgrimes 1680213811Sobrienstatic void 168190111Simpsynexpect(int token) 168217987Speter{ 16831556Srgrimes char msg[64]; 16841556Srgrimes 16851556Srgrimes if (token >= 0) { 16861556Srgrimes fmtstr(msg, 64, "%s unexpected (expecting %s)", 16871556Srgrimes tokname[lasttoken], tokname[token]); 16881556Srgrimes } else { 16891556Srgrimes fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); 16901556Srgrimes } 16911556Srgrimes synerror(msg); 16921556Srgrimes} 16931556Srgrimes 16941556Srgrimes 1695213811Sobrienstatic void 1696201053Sjillessynerror(const char *msg) 169790111Simp{ 16981556Srgrimes if (commandname) 1699201366Sjilles outfmt(out2, "%s: %d: ", commandname, startlinno); 1700201366Sjilles outfmt(out2, "Syntax error: %s\n", msg); 17011556Srgrimes error((char *)NULL); 17021556Srgrimes} 17031556Srgrimes 1704213811Sobrienstatic void 170590111Simpsetprompt(int which) 170690111Simp{ 17071556Srgrimes whichprompt = which; 17081556Srgrimes 170917987Speter#ifndef NO_HISTORY 17101556Srgrimes if (!el) 171117987Speter#endif 1712199629Sjilles { 17131556Srgrimes out2str(getprompt(NULL)); 1714199629Sjilles flushout(out2); 1715199629Sjilles } 17161556Srgrimes} 17171556Srgrimes 17181556Srgrimes/* 17191556Srgrimes * called by editline -- any expansions to the prompt 17201556Srgrimes * should be added here. 17211556Srgrimes */ 17221556Srgrimeschar * 172390111Simpgetprompt(void *unused __unused) 172425905Ssteve{ 1725142845Sobrien static char ps[PROMPTLEN]; 1726142845Sobrien char *fmt; 1727209653Sjilles const char *pwd; 1728209653Sjilles int i, trim; 1729201053Sjilles static char internal_error[] = "<internal prompt error>"; 1730142845Sobrien 1731142845Sobrien /* 1732142845Sobrien * Select prompt format. 1733142845Sobrien */ 17341556Srgrimes switch (whichprompt) { 17351556Srgrimes case 0: 1736201053Sjilles fmt = nullstr; 1737142845Sobrien break; 17381556Srgrimes case 1: 1739142845Sobrien fmt = ps1val(); 1740142845Sobrien break; 17411556Srgrimes case 2: 1742142845Sobrien fmt = ps2val(); 1743142845Sobrien break; 17441556Srgrimes default: 1745201053Sjilles return internal_error; 17461556Srgrimes } 1747142845Sobrien 1748142845Sobrien /* 1749142845Sobrien * Format prompt string. 1750142845Sobrien */ 1751142845Sobrien for (i = 0; (i < 127) && (*fmt != '\0'); i++, fmt++) 1752142845Sobrien if (*fmt == '\\') 1753142845Sobrien switch (*++fmt) { 1754142845Sobrien 1755142845Sobrien /* 1756142845Sobrien * Hostname. 1757142845Sobrien * 1758142845Sobrien * \h specifies just the local hostname, 1759142845Sobrien * \H specifies fully-qualified hostname. 1760142845Sobrien */ 1761142845Sobrien case 'h': 1762142845Sobrien case 'H': 1763149024Sstefanf ps[i] = '\0'; 1764142845Sobrien gethostname(&ps[i], PROMPTLEN - i); 1765142845Sobrien /* Skip to end of hostname. */ 1766142845Sobrien trim = (*fmt == 'h') ? '.' : '\0'; 1767142845Sobrien while ((ps[i+1] != '\0') && (ps[i+1] != trim)) 1768142845Sobrien i++; 1769142845Sobrien break; 1770142845Sobrien 1771142845Sobrien /* 1772142845Sobrien * Working directory. 1773142845Sobrien * 1774142845Sobrien * \W specifies just the final component, 1775142845Sobrien * \w specifies the entire path. 1776142845Sobrien */ 1777142845Sobrien case 'W': 1778142845Sobrien case 'w': 1779209653Sjilles pwd = lookupvar("PWD"); 1780209653Sjilles if (pwd == NULL) 1781209653Sjilles pwd = "?"; 1782209653Sjilles if (*fmt == 'W' && 1783209653Sjilles *pwd == '/' && pwd[1] != '\0') 1784209653Sjilles strlcpy(&ps[i], strrchr(pwd, '/') + 1, 1785209653Sjilles PROMPTLEN - i); 1786209653Sjilles else 1787209653Sjilles strlcpy(&ps[i], pwd, PROMPTLEN - i); 1788142845Sobrien /* Skip to end of path. */ 1789142845Sobrien while (ps[i + 1] != '\0') 1790142845Sobrien i++; 1791142845Sobrien break; 1792142845Sobrien 1793142845Sobrien /* 1794142845Sobrien * Superuser status. 1795142845Sobrien * 1796142845Sobrien * '$' for normal users, '#' for root. 1797142845Sobrien */ 1798142845Sobrien case '$': 1799142845Sobrien ps[i] = (geteuid() != 0) ? '$' : '#'; 1800142845Sobrien break; 1801142845Sobrien 1802142845Sobrien /* 1803142845Sobrien * A literal \. 1804142845Sobrien */ 1805142845Sobrien case '\\': 1806142845Sobrien ps[i] = '\\'; 1807142845Sobrien break; 1808142845Sobrien 1809142845Sobrien /* 1810142845Sobrien * Emit unrecognized formats verbatim. 1811142845Sobrien */ 1812142845Sobrien default: 1813142845Sobrien ps[i++] = '\\'; 1814142845Sobrien ps[i] = *fmt; 1815142845Sobrien break; 1816142845Sobrien } 1817142845Sobrien else 1818142845Sobrien ps[i] = *fmt; 1819142845Sobrien ps[i] = '\0'; 1820142845Sobrien return (ps); 18211556Srgrimes} 1822