bin/sh/parser.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Kenneth Almquist.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <pwd.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40 #include <time.h>
  41
  42 #include "shell.h"
  43 #include "parser.h"
  44 #include "nodes.h"
  45 #include "expand.h"     /* defines rmescapes() */
  46 #include "syntax.h"
  47 #include "options.h"
  48 #include "input.h"
  49 #include "output.h"
  50 #include "var.h"
  51 #include "error.h"
  52 #include "memalloc.h"
  53 #include "mystring.h"
  54 #include "alias.h"
  55 #include "show.h"
  56 #include "eval.h"
  57 #include "exec.h"       /* to check for special builtins */
  58 #ifndef NO_HISTORY
  59 #include "myhistedit.h"
  60 #endif
  61
  62 /*
  63  * Shell command parser.
  64  */
  65
  66 #define PROMPTLEN       192
  67
  68 /* values of checkkwd variable */
  69 #define CHKALIAS        0x1
  70 #define CHKKWD          0x2
  71 #define CHKNL           0x4
  72
  73 /* values returned by readtoken */
  74 #include "token.h"
  75
  76
  77
  78 struct heredoc {
  79         struct heredoc *next;   /* next here document in list */
  80         union node *here;               /* redirection node */
  81         char *eofmark;          /* string indicating end of input */
  82         int striptabs;          /* if set, strip leading tabs */
  83 };
  84
  85 struct parser_temp {
  86         struct parser_temp *next;
  87         void *data;
  88 };
  89
  90
  91 static struct heredoc *heredoclist;     /* list of here documents to read */
  92 static int doprompt;            /* if set, prompt the user */
  93 static int needprompt;          /* true if interactive and at start of line */
  94 static int lasttoken;           /* last token read */
  95 static int tokpushback;         /* last token pushed back */
  96 static char *wordtext;          /* text of last word returned by readtoken */
  97 static int checkkwd;
  98 static struct nodelist *backquotelist;
  99 static union node *redirnode;
 100 static struct heredoc *heredoc;
 101 static int quoteflag;           /* set if (part of) last token was quoted */
 102 static int startlinno;          /* line # where last token started */
 103 static int funclinno;           /* line # where the current function started */
 104 static struct parser_temp *parser_temp;
 105
 106 #define NOEOFMARK ((const char *)&heredoclist)
 107
 108
 109 static union node *list(int);
 110 static union node *andor(void);
 111 static union node *pipeline(void);
 112 static union node *command(void);
 113 static union node *simplecmd(union node **, union node *);
 114 static union node *makename(void);
 115 static union node *makebinary(int type, union node *n1, union node *n2);
 116 static void parsefname(void);
 117 static void parseheredoc(void);
 118 static int peektoken(void);
 119 static int readtoken(void);
 120 static int xxreadtoken(void);
 121 static int readtoken1(int, const char *, const char *, int);
 122 static int noexpand(char *);
 123 static void consumetoken(int);
 124 static void synexpect(int) __dead2;
 125 static void synerror(const char *) __dead2;
 126 static void setprompt(int);
 127 static int pgetc_linecont(void);
 128 static void getusername(char *, size_t);
 129
 130
 131 static void *
 132 parser_temp_alloc(size_t len)
 133 {
 134         struct parser_temp *t;
 135
 136         INTOFF;
 137         t = ckmalloc(sizeof(*t));
 138         t->data = NULL;
 139         t->next = parser_temp;
 140         parser_temp = t;
 141         t->data = ckmalloc(len);
 142         INTON;
 143         return t->data;
 144 }
 145
 146
 147 static void *
 148 parser_temp_realloc(void *ptr, size_t len)
 149 {
 150         struct parser_temp *t;
 151
 152         INTOFF;
 153         t = parser_temp;
 154         if (ptr != t->data)
 155                 error("bug: parser_temp_realloc misused");
 156         t->data = ckrealloc(t->data, len);
 157         INTON;
 158         return t->data;
 159 }
 160
 161
 162 static void
 163 parser_temp_free_upto(void *ptr)
 164 {
 165         struct parser_temp *t;
 166         int done = 0;
 167
 168         INTOFF;
 169         while (parser_temp != NULL && !done) {
 170                 t = parser_temp;
 171                 parser_temp = t->next;
 172                 done = t->data == ptr;
 173                 ckfree(t->data);
 174                 ckfree(t);
 175         }
 176         INTON;
 177         if (!done)
 178                 error("bug: parser_temp_free_upto misused");
 179 }
 180
 181
 182 static void
 183 parser_temp_free_all(void)
 184 {
 185         struct parser_temp *t;
 186
 187         INTOFF;
 188         while (parser_temp != NULL) {
 189                 t = parser_temp;
 190                 parser_temp = t->next;
 191                 ckfree(t->data);
 192                 ckfree(t);
 193         }
 194         INTON;
 195 }
 196
 197
 198 /*
 199  * Read and parse a command.  Returns NEOF on end of file.  (NULL is a
 200  * valid parse tree indicating a blank line.)
 201  */
 202
 203 union node *
 204 parsecmd(int interact)
 205 {
 206         int t;
 207
 208         /* This assumes the parser is not re-entered,
 209          * which could happen if we add command substitution on PS1/PS2.
 210          */
 211         parser_temp_free_all();
 212         heredoclist = NULL;
 213
 214         tokpushback = 0;
 215         checkkwd = 0;
 216         doprompt = interact;
 217         if (doprompt)
 218                 setprompt(1);
 219         else
 220                 setprompt(0);
 221         needprompt = 0;
 222         t = readtoken();
 223         if (t == TEOF)
 224                 return NEOF;
 225         if (t == TNL)
 226                 return NULL;
 227         tokpushback++;
 228         return list(1);
 229 }
 230
 231
 232 /*
 233  * Read and parse words for wordexp.
 234  * Returns a list of NARG nodes; NULL if there are no words.
 235  */
 236 union node *
 237 parsewordexp(void)
 238 {
 239         union node *n, *first = NULL, **pnext;
 240         int t;
 241
 242         /* This assumes the parser is not re-entered,
 243          * which could happen if we add command substitution on PS1/PS2.
 244          */
 245         parser_temp_free_all();
 246         heredoclist = NULL;
 247
 248         tokpushback = 0;
 249         checkkwd = 0;
 250         doprompt = 0;
 251         setprompt(0);
 252         needprompt = 0;
 253         pnext = &first;
 254         while ((t = readtoken()) != TEOF) {
 255                 if (t != TWORD)
 256                         synexpect(TWORD);
 257                 n = makename();
 258                 *pnext = n;
 259                 pnext = &n->narg.next;
 260         }
 261         return first;
 262 }
 263
 264
 265 static union node *
 266 list(int nlflag)
 267 {
 268         union node *ntop, *n1, *n2, *n3;
 269         int tok;
 270
 271         checkkwd = CHKNL | CHKKWD | CHKALIAS;
 272         if (!nlflag && tokendlist[peektoken()])
 273                 return NULL;
 274         ntop = n1 = NULL;
 275         for (;;) {
 276                 n2 = andor();
 277                 tok = readtoken();
 278                 if (tok == TBACKGND) {
 279                         if (n2 != NULL && n2->type == NPIPE) {
 280                                 n2->npipe.backgnd = 1;
 281                         } else if (n2 != NULL && n2->type == NREDIR) {
 282                                 n2->type = NBACKGND;
 283                         } else {
 284                                 n3 = (union node *)stalloc(sizeof (struct nredir));
 285                                 n3->type = NBACKGND;
 286                                 n3->nredir.n = n2;
 287                                 n3->nredir.redirect = NULL;
 288                                 n2 = n3;
 289                         }
 290                 }
 291                 if (ntop == NULL)
 292                         ntop = n2;
 293                 else if (n1 == NULL) {
 294                         n1 = makebinary(NSEMI, ntop, n2);
 295                         ntop = n1;
 296                 }
 297                 else {
 298                         n3 = makebinary(NSEMI, n1->nbinary.ch2, n2);
 299                         n1->nbinary.ch2 = n3;
 300                         n1 = n3;
 301                 }
 302                 switch (tok) {
 303                 case TBACKGND:
 304                 case TSEMI:
 305                         tok = readtoken();
 306                         /* FALLTHROUGH */
 307                 case TNL:
 308                         if (tok == TNL) {
 309                                 parseheredoc();
 310                                 if (nlflag)
 311                                         return ntop;
 312                         } else if (tok == TEOF && nlflag) {
 313                                 parseheredoc();
 314                                 return ntop;
 315                         } else {
 316                                 tokpushback++;
 317                         }
 318                         checkkwd = CHKNL | CHKKWD | CHKALIAS;
 319                         if (!nlflag && tokendlist[peektoken()])
 320                                 return ntop;
 321                         break;
 322                 case TEOF:
 323                         if (heredoclist)
 324                                 parseheredoc();
 325                         else
 326                                 pungetc();              /* push back EOF on input */
 327                         return ntop;
 328                 default:
 329                         if (nlflag)
 330                                 synexpect(-1);
 331                         tokpushback++;
 332                         return ntop;
 333                 }
 334         }
 335 }
 336
 337
 338
 339 static union node *
 340 andor(void)
 341 {
 342         union node *n;
 343         int t;
 344
 345         n = pipeline();
 346         for (;;) {
 347                 if ((t = readtoken()) == TAND) {
 348                         t = NAND;
 349                 } else if (t == TOR) {
 350                         t = NOR;
 351                 } else {
 352                         tokpushback++;
 353                         return n;
 354                 }
 355                 n = makebinary(t, n, pipeline());
 356         }
 357 }
 358
 359
 360
 361 static union node *
 362 pipeline(void)
 363 {
 364         union node *n1, *n2, *pipenode;
 365         struct nodelist *lp, *prev;
 366         int negate, t;
 367
 368         negate = 0;
 369         checkkwd = CHKNL | CHKKWD | CHKALIAS;
 370         TRACE(("pipeline: entered\n"));
 371         while (readtoken() == TNOT)
 372                 negate = !negate;
 373         tokpushback++;
 374         n1 = command();
 375         if (readtoken() == TPIPE) {
 376                 pipenode = (union node *)stalloc(sizeof (struct npipe));
 377                 pipenode->type = NPIPE;
 378                 pipenode->npipe.backgnd = 0;
 379                 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
 380                 pipenode->npipe.cmdlist = lp;
 381                 lp->n = n1;
 382                 do {
 383                         prev = lp;
 384                         lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
 385                         checkkwd = CHKNL | CHKKWD | CHKALIAS;
 386                         t = readtoken();
 387                         tokpushback++;
 388                         if (t == TNOT)
 389                                 lp->n = pipeline();
 390                         else
 391                                 lp->n = command();
 392                         prev->next = lp;
 393                 } while (readtoken() == TPIPE);
 394                 lp->next = NULL;
 395                 n1 = pipenode;
 396         }
 397         tokpushback++;
 398         if (negate) {
 399                 n2 = (union node *)stalloc(sizeof (struct nnot));
 400                 n2->type = NNOT;
 401                 n2->nnot.com = n1;
 402                 return n2;
 403         } else
 404                 return n1;
 405 }
 406
 407
 408
 409 static union node *
 410 command(void)
 411 {
 412         union node *n1, *n2;
 413         union node *ap, **app;
 414         union node *cp, **cpp;
 415         union node *redir, **rpp;
 416         int t;
 417         int is_subshell;
 418
 419         checkkwd = CHKNL | CHKKWD | CHKALIAS;
 420         is_subshell = 0;
 421         redir = NULL;
 422         n1 = NULL;
 423         rpp = &redir;
 424
 425         /* Check for redirection which may precede command */
 426         while (readtoken() == TREDIR) {
 427                 *rpp = n2 = redirnode;
 428                 rpp = &n2->nfile.next;
 429                 parsefname();
 430         }
 431         tokpushback++;
 432
 433         switch (readtoken()) {
 434         case TIF:
 435                 n1 = (union node *)stalloc(sizeof (struct nif));
 436                 n1->type = NIF;
 437                 if ((n1->nif.test = list(0)) == NULL)
 438                         synexpect(-1);
 439                 consumetoken(TTHEN);
 440                 n1->nif.ifpart = list(0);
 441                 n2 = n1;
 442                 while (readtoken() == TELIF) {
 443                         n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
 444                         n2 = n2->nif.elsepart;
 445                         n2->type = NIF;
 446                         if ((n2->nif.test = list(0)) == NULL)
 447                                 synexpect(-1);
 448                         consumetoken(TTHEN);
 449                         n2->nif.ifpart = list(0);
 450                 }
 451                 if (lasttoken == TELSE)
 452                         n2->nif.elsepart = list(0);
 453                 else {
 454                         n2->nif.elsepart = NULL;
 455                         tokpushback++;
 456                 }
 457                 consumetoken(TFI);
 458                 checkkwd = CHKKWD | CHKALIAS;
 459                 break;
 460         case TWHILE:
 461         case TUNTIL:
 462                 t = lasttoken;
 463                 if ((n1 = list(0)) == NULL)
 464                         synexpect(-1);
 465                 consumetoken(TDO);
 466                 n1 = makebinary((t == TWHILE)? NWHILE : NUNTIL, n1, list(0));
 467                 consumetoken(TDONE);
 468                 checkkwd = CHKKWD | CHKALIAS;
 469                 break;
 470         case TFOR:
 471                 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
 472                         synerror("Bad for loop variable");
 473                 n1 = (union node *)stalloc(sizeof (struct nfor));
 474                 n1->type = NFOR;
 475                 n1->nfor.var = wordtext;
 476                 checkkwd = CHKNL;
 477                 if (readtoken() == TWORD && !quoteflag &&
 478                     equal(wordtext, "in")) {
 479                         app = &ap;
 480                         while (readtoken() == TWORD) {
 481                                 n2 = makename();
 482                                 *app = n2;
 483                                 app = &n2->narg.next;
 484                         }
 485                         *app = NULL;
 486                         n1->nfor.args = ap;
 487                         if (lasttoken == TNL)
 488                                 tokpushback++;
 489                         else if (lasttoken != TSEMI)
 490                                 synexpect(-1);
 491                 } else {
 492                         static char argvars[5] = {
 493                                 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
 494                         };
 495                         n2 = (union node *)stalloc(sizeof (struct narg));
 496                         n2->type = NARG;
 497                         n2->narg.text = argvars;
 498                         n2->narg.backquote = NULL;
 499                         n2->narg.next = NULL;
 500                         n1->nfor.args = n2;
 501                         /*
 502                          * Newline or semicolon here is optional (but note
 503                          * that the original Bourne shell only allowed NL).
 504                          */
 505                         if (lasttoken != TSEMI)
 506                                 tokpushback++;
 507                 }
 508                 checkkwd = CHKNL | CHKKWD | CHKALIAS;
 509                 if ((t = readtoken()) == TDO)
 510                         t = TDONE;
 511                 else if (t == TBEGIN)
 512                         t = TEND;
 513                 else
 514                         synexpect(-1);
 515                 n1->nfor.body = list(0);
 516                 consumetoken(t);
 517                 checkkwd = CHKKWD | CHKALIAS;
 518                 break;
 519         case TCASE:
 520                 n1 = (union node *)stalloc(sizeof (struct ncase));
 521                 n1->type = NCASE;
 522                 consumetoken(TWORD);
 523                 n1->ncase.expr = makename();
 524                 checkkwd = CHKNL;
 525                 if (readtoken() != TWORD || ! equal(wordtext, "in"))
 526                         synerror("expecting \"in\"");
 527                 cpp = &n1->ncase.cases;
 528                 checkkwd = CHKNL | CHKKWD, readtoken();
 529                 while (lasttoken != TESAC) {
 530                         *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
 531                         cp->type = NCLIST;
 532                         app = &cp->nclist.pattern;
 533                         if (lasttoken == TLP)
 534                                 readtoken();
 535                         for (;;) {
 536                                 *app = ap = makename();
 537                                 checkkwd = CHKNL | CHKKWD;
 538                                 if (readtoken() != TPIPE)
 539                                         break;
 540                                 app = &ap->narg.next;
 541                                 readtoken();
 542                         }
 543                         ap->narg.next = NULL;
 544                         if (lasttoken != TRP)
 545                                 synexpect(TRP);
 546                         cp->nclist.body = list(0);
 547
 548                         checkkwd = CHKNL | CHKKWD | CHKALIAS;
 549                         if ((t = readtoken()) != TESAC) {
 550                                 if (t == TENDCASE)
 551                                         ;
 552                                 else if (t == TFALLTHRU)
 553                                         cp->type = NCLISTFALLTHRU;
 554                                 else
 555                                         synexpect(TENDCASE);
 556                                 checkkwd = CHKNL | CHKKWD, readtoken();
 557                         }
 558                         cpp = &cp->nclist.next;
 559                 }
 560                 *cpp = NULL;
 561                 checkkwd = CHKKWD | CHKALIAS;
 562                 break;
 563         case TLP:
 564                 n1 = (union node *)stalloc(sizeof (struct nredir));
 565                 n1->type = NSUBSHELL;
 566                 n1->nredir.n = list(0);
 567                 n1->nredir.redirect = NULL;
 568                 consumetoken(TRP);
 569                 checkkwd = CHKKWD | CHKALIAS;
 570                 is_subshell = 1;
 571                 break;
 572         case TBEGIN:
 573                 n1 = list(0);
 574                 consumetoken(TEND);
 575                 checkkwd = CHKKWD | CHKALIAS;
 576                 break;
 577         /* A simple command must have at least one redirection or word. */
 578         case TBACKGND:
 579         case TSEMI:
 580         case TAND:
 581         case TOR:
 582         case TPIPE:
 583         case TENDCASE:
 584         case TFALLTHRU:
 585         case TEOF:
 586         case TNL:
 587         case TRP:
 588                 if (!redir)
 589                         synexpect(-1);
 590         case TWORD:
 591                 tokpushback++;
 592                 n1 = simplecmd(rpp, redir);
 593                 return n1;
 594         default:
 595                 synexpect(-1);
 596         }
 597
 598         /* Now check for redirection which may follow command */
 599         while (readtoken() == TREDIR) {
 600                 *rpp = n2 = redirnode;
 601                 rpp = &n2->nfile.next;
 602                 parsefname();
 603         }
 604         tokpushback++;
 605         *rpp = NULL;
 606         if (redir) {
 607                 if (!is_subshell) {
 608                         n2 = (union node *)stalloc(sizeof (struct nredir));
 609                         n2->type = NREDIR;
 610                         n2->nredir.n = n1;
 611                         n1 = n2;
 612                 }
 613                 n1->nredir.redirect = redir;
 614         }
 615
 616         return n1;
 617 }
 618
 619
 620 static union node *
 621 simplecmd(union node **rpp, union node *redir)
 622 {
 623         union node *args, **app;
 624         union node **orig_rpp = rpp;
 625         union node *n = NULL;
 626         int special;
 627         int savecheckkwd;
 628
 629         /* If we don't have any redirections already, then we must reset */
 630         /* rpp to be the address of the local redir variable.  */
 631         if (redir == NULL)
 632                 rpp = &redir;
 633
 634         args = NULL;
 635         app = &args;
 636         /*
 637          * We save the incoming value, because we need this for shell
 638          * functions.  There can not be a redirect or an argument between
 639          * the function name and the open parenthesis.
 640          */
 641         orig_rpp = rpp;
 642
 643         savecheckkwd = CHKALIAS;
 644
 645         for (;;) {
 646                 checkkwd = savecheckkwd;
 647                 if (readtoken() == TWORD) {
 648                         n = makename();
 649                         *app = n;
 650                         app = &n->narg.next;
 651                         if (savecheckkwd != 0 && !isassignment(wordtext))
 652                                 savecheckkwd = 0;
 653                 } else if (lasttoken == TREDIR) {
 654                         *rpp = n = redirnode;
 655                         rpp = &n->nfile.next;
 656                         parsefname();   /* read name of redirection file */
 657                 } else if (lasttoken == TLP && app == &args->narg.next
 658                                             && rpp == orig_rpp) {
 659                         /* We have a function */
 660                         consumetoken(TRP);
 661                         funclinno = plinno;
 662                         /*
 663                          * - Require plain text.
 664                          * - Functions with '/' cannot be called.
 665                          * - Reject name=().
 666                          * - Reject ksh extended glob patterns.
 667                          */
 668                         if (!noexpand(n->narg.text) || quoteflag ||
 669                             strchr(n->narg.text, '/') ||
 670                             strchr("!%*+-=?@}~",
 671                                 n->narg.text[strlen(n->narg.text) - 1]))
 672                                 synerror("Bad function name");
 673                         rmescapes(n->narg.text);
 674                         if (find_builtin(n->narg.text, &special) >= 0 &&
 675                             special)
 676                                 synerror("Cannot override a special builtin with a function");
 677                         n->type = NDEFUN;
 678                         n->narg.next = command();
 679                         funclinno = 0;
 680                         return n;
 681                 } else {
 682                         tokpushback++;
 683                         break;
 684                 }
 685         }
 686         *app = NULL;
 687         *rpp = NULL;
 688         n = (union node *)stalloc(sizeof (struct ncmd));
 689         n->type = NCMD;
 690         n->ncmd.args = args;
 691         n->ncmd.redirect = redir;
 692         return n;
 693 }
 694
 695 static union node *
 696 makename(void)
 697 {
 698         union node *n;
 699
 700         n = (union node *)stalloc(sizeof (struct narg));
 701         n->type = NARG;
 702         n->narg.next = NULL;
 703         n->narg.text = wordtext;
 704         n->narg.backquote = backquotelist;
 705         return n;
 706 }
 707
 708 static union node *
 709 makebinary(int type, union node *n1, union node *n2)
 710 {
 711         union node *n;
 712
 713         n = (union node *)stalloc(sizeof (struct nbinary));
 714         n->type = type;
 715         n->nbinary.ch1 = n1;
 716         n->nbinary.ch2 = n2;
 717         return (n);
 718 }
 719
 720 void
 721 forcealias(void)
 722 {
 723         checkkwd |= CHKALIAS;
 724 }
 725
 726 void
 727 fixredir(union node *n, const char *text, int err)
 728 {
 729         TRACE(("Fix redir %s %d\n", text, err));
 730         if (!err)
 731                 n->ndup.vname = NULL;
 732
 733         if (is_digit(text[0]) && text[1] == '\0')
 734                 n->ndup.dupfd = digit_val(text[0]);
 735         else if (text[0] == '-' && text[1] == '\0')
 736                 n->ndup.dupfd = -1;
 737         else {
 738
 739                 if (err)
 740                         synerror("Bad fd number");
 741                 else
 742                         n->ndup.vname = makename();
 743         }
 744 }
 745
 746
 747 static void
 748 parsefname(void)
 749 {
 750         union node *n = redirnode;
 751
 752         consumetoken(TWORD);
 753         if (n->type == NHERE) {
 754                 struct heredoc *here = heredoc;
 755                 struct heredoc *p;
 756
 757                 if (quoteflag == 0)
 758                         n->type = NXHERE;
 759                 TRACE(("Here document %d\n", n->type));
 760                 if (here->striptabs) {
 761                         while (*wordtext == '\t')
 762                                 wordtext++;
 763                 }
 764                 if (! noexpand(wordtext))
 765                         synerror("Illegal eof marker for << redirection");
 766                 rmescapes(wordtext);
 767                 here->eofmark = wordtext;
 768                 here->next = NULL;
 769                 if (heredoclist == NULL)
 770                         heredoclist = here;
 771                 else {
 772                         for (p = heredoclist ; p->next ; p = p->next);
 773                         p->next = here;
 774                 }
 775         } else if (n->type == NTOFD || n->type == NFROMFD) {
 776                 fixredir(n, wordtext, 0);
 777         } else {
 778                 n->nfile.fname = makename();
 779         }
 780 }
 781
 782
 783 /*
 784  * Input any here documents.
 785  */
 786
 787 static void
 788 parseheredoc(void)
 789 {
 790         struct heredoc *here;
 791         union node *n;
 792
 793         while (heredoclist) {
 794                 here = heredoclist;
 795                 heredoclist = here->next;
 796                 if (needprompt) {
 797                         setprompt(2);
 798                         needprompt = 0;
 799                 }
 800                 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
 801                                 here->eofmark, here->striptabs);
 802                 n = makename();
 803                 here->here->nhere.doc = n;
 804         }
 805 }
 806
 807 static int
 808 peektoken(void)
 809 {
 810         int t;
 811
 812         t = readtoken();
 813         tokpushback++;
 814         return (t);
 815 }
 816
 817 static int
 818 readtoken(void)
 819 {
 820         int t;
 821         struct alias *ap;
 822 #ifdef DEBUG
 823         int alreadyseen = tokpushback;
 824 #endif
 825
 826         top:
 827         t = xxreadtoken();
 828
 829         /*
 830          * eat newlines
 831          */
 832         if (checkkwd & CHKNL) {
 833                 while (t == TNL) {
 834                         parseheredoc();
 835                         t = xxreadtoken();
 836                 }
 837         }
 838
 839         /*
 840          * check for keywords and aliases
 841          */
 842         if (t == TWORD && !quoteflag)
 843         {
 844                 const char * const *pp;
 845
 846                 if (checkkwd & CHKKWD)
 847                         for (pp = parsekwd; *pp; pp++) {
 848                                 if (**pp == *wordtext && equal(*pp, wordtext))
 849                                 {
 850                                         lasttoken = t = pp - parsekwd + KWDOFFSET;
 851                                         TRACE(("keyword %s recognized\n", tokname[t]));
 852                                         goto out;
 853                                 }
 854                         }
 855                 if (checkkwd & CHKALIAS &&
 856                     (ap = lookupalias(wordtext, 1)) != NULL) {
 857                         pushstring(ap->val, strlen(ap->val), ap);
 858                         goto top;
 859                 }
 860         }
 861 out:
 862         if (t != TNOT)
 863                 checkkwd = 0;
 864
 865 #ifdef DEBUG
 866         if (!alreadyseen)
 867             TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
 868         else
 869             TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));
 870 #endif
 871         return (t);
 872 }
 873
 874
 875 /*
 876  * Read the next input token.
 877  * If the token is a word, we set backquotelist to the list of cmds in
 878  *      backquotes.  We set quoteflag to true if any part of the word was
 879  *      quoted.
 880  * If the token is TREDIR, then we set redirnode to a structure containing
 881  *      the redirection.
 882  * In all cases, the variable startlinno is set to the number of the line
 883  *      on which the token starts.
 884  *
 885  * [Change comment:  here documents and internal procedures]
 886  * [Readtoken shouldn't have any arguments.  Perhaps we should make the
 887  *  word parsing code into a separate routine.  In this case, readtoken
 888  *  doesn't need to have any internal procedures, but parseword does.
 889  *  We could also make parseoperator in essence the main routine, and
 890  *  have parseword (readtoken1?) handle both words and redirection.]
 891  */
 892
 893 #define RETURN(token)   return lasttoken = token
 894
 895 static int
 896 xxreadtoken(void)
 897 {
 898         int c;
 899
 900         if (tokpushback) {
 901                 tokpushback = 0;
 902                 return lasttoken;
 903         }
 904         if (needprompt) {
 905                 setprompt(2);
 906                 needprompt = 0;
 907         }
 908         startlinno = plinno;
 909         for (;;) {      /* until token or start of word found */
 910                 c = pgetc_macro();
 911                 switch (c) {
 912                 case ' ': case '\t':
 913                         continue;
 914                 case '#':
 915                         while ((c = pgetc()) != '\n' && c != PEOF);
 916                         pungetc();
 917                         continue;
 918                 case '\\':
 919                         if (pgetc() == '\n') {
 920                                 startlinno = ++plinno;
 921                                 if (doprompt)
 922                                         setprompt(2);
 923                                 else
 924                                         setprompt(0);
 925                                 continue;
 926                         }
 927                         pungetc();
 928                         /* FALLTHROUGH */
 929                 default:
 930                         return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
 931                 case '\n':
 932                         plinno++;
 933                         needprompt = doprompt;
 934                         RETURN(TNL);
 935                 case PEOF:
 936                         RETURN(TEOF);
 937                 case '&':
 938                         if (pgetc_linecont() == '&')
 939                                 RETURN(TAND);
 940                         pungetc();
 941                         RETURN(TBACKGND);
 942                 case '|':
 943                         if (pgetc_linecont() == '|')
 944                                 RETURN(TOR);
 945                         pungetc();
 946                         RETURN(TPIPE);
 947                 case ';':
 948                         c = pgetc_linecont();
 949                         if (c == ';')
 950                                 RETURN(TENDCASE);
 951                         else if (c == '&')
 952                                 RETURN(TFALLTHRU);
 953                         pungetc();
 954                         RETURN(TSEMI);
 955                 case '(':
 956                         RETURN(TLP);
 957                 case ')':
 958                         RETURN(TRP);
 959                 }
 960         }
 961 #undef RETURN
 962 }
 963
 964
 965 #define MAXNEST_static 8
 966 struct tokenstate
 967 {
 968         const char *syntax; /* *SYNTAX */
 969         int parenlevel; /* levels of parentheses in arithmetic */
 970         enum tokenstate_category
 971         {
 972                 TSTATE_TOP,
 973                 TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */
 974                 TSTATE_VAR_NEW, /* other ${var...}, own dquote state */
 975                 TSTATE_ARITH
 976         } category;
 977 };
 978
 979
 980 /*
 981  * Check to see whether we are at the end of the here document.  When this
 982  * is called, c is set to the first character of the next input line.  If
 983  * we are at the end of the here document, this routine sets the c to PEOF.
 984  * The new value of c is returned.
 985  */
 986
 987 static int
 988 checkend(int c, const char *eofmark, int striptabs)
 989 {
 990         if (striptabs) {
 991                 while (c == '\t')
 992                         c = pgetc();
 993         }
 994         if (c == *eofmark) {
 995                 int c2;
 996                 const char *q;
 997
 998                 for (q = eofmark + 1; c2 = pgetc(), *q != '\0' && c2 == *q; q++)
 999                         ;
1000                 if ((c2 == PEOF || c2 == '\n') && *q == '\0') {
1001                         c = PEOF;
1002                         if (c2 == '\n') {
1003                                 plinno++;
1004                                 needprompt = doprompt;
1005                         }
1006                 } else {
1007                         pungetc();
1008                         pushstring(eofmark + 1, q - (eofmark + 1), NULL);
1009                 }
1010         } else if (c == '\n' && *eofmark == '\0') {
1011                 c = PEOF;
1012                 plinno++;
1013                 needprompt = doprompt;
1014         }
1015         return (c);
1016 }
1017
1018
1019 /*
1020  * Parse a redirection operator.  The variable "out" points to a string
1021  * specifying the fd to be redirected.  The variable "c" contains the
1022  * first character of the redirection operator.
1023  */
1024
1025 static void
1026 parseredir(char *out, int c)
1027 {
1028         char fd = *out;
1029         union node *np;
1030
1031         np = (union node *)stalloc(sizeof (struct nfile));
1032         if (c == '>') {
1033                 np->nfile.fd = 1;
1034                 c = pgetc_linecont();
1035                 if (c == '>')
1036                         np->type = NAPPEND;
1037                 else if (c == '&')
1038                         np->type = NTOFD;
1039                 else if (c == '|')
1040                         np->type = NCLOBBER;
1041                 else {
1042                         np->type = NTO;
1043                         pungetc();
1044                 }
1045         } else {        /* c == '<' */
1046                 np->nfile.fd = 0;
1047                 c = pgetc_linecont();
1048                 if (c == '<') {
1049                         if (sizeof (struct nfile) != sizeof (struct nhere)) {
1050                                 np = (union node *)stalloc(sizeof (struct nhere));
1051                                 np->nfile.fd = 0;
1052                         }
1053                         np->type = NHERE;
1054                         heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
1055                         heredoc->here = np;
1056                         if ((c = pgetc_linecont()) == '-') {
1057                                 heredoc->striptabs = 1;
1058                         } else {
1059                                 heredoc->striptabs = 0;
1060                                 pungetc();
1061                         }
1062                 } else if (c == '&')
1063                         np->type = NFROMFD;
1064                 else if (c == '>')
1065                         np->type = NFROMTO;
1066                 else {
1067                         np->type = NFROM;
1068                         pungetc();
1069                 }
1070         }
1071         if (fd != '\0')
1072                 np->nfile.fd = digit_val(fd);
1073         redirnode = np;
1074 }
1075
1076 /*
1077  * Called to parse command substitutions.
1078  */
1079
1080 static char *
1081 parsebackq(char *out, struct nodelist **pbqlist,
1082                 int oldstyle, int dblquote, int quoted)
1083 {
1084         struct nodelist **nlpp;
1085         union node *n;
1086         char *volatile str;
1087         struct jmploc jmploc;
1088         struct jmploc *const savehandler = handler;
1089         size_t savelen;
1090         int saveprompt;
1091         const int bq_startlinno = plinno;
1092         char *volatile ostr = NULL;
1093         struct parsefile *const savetopfile = getcurrentfile();
1094         struct heredoc *const saveheredoclist = heredoclist;
1095         struct heredoc *here;
1096
1097         str = NULL;
1098         if (setjmp(jmploc.loc)) {
1099                 popfilesupto(savetopfile);
1100                 if (str)
1101                         ckfree(str);
1102                 if (ostr)
1103                         ckfree(ostr);
1104                 heredoclist = saveheredoclist;
1105                 handler = savehandler;
1106                 if (exception == EXERROR) {
1107                         startlinno = bq_startlinno;
1108                         synerror("Error in command substitution");
1109                 }
1110                 longjmp(handler->loc, 1);
1111         }
1112         INTOFF;
1113         savelen = out - stackblock();
1114         if (savelen > 0) {
1115                 str = ckmalloc(savelen);
1116                 memcpy(str, stackblock(), savelen);
1117         }
1118         handler = &jmploc;
1119         heredoclist = NULL;
1120         INTON;
1121         if (oldstyle) {
1122                 /* We must read until the closing backquote, giving special
1123                    treatment to some slashes, and then push the string and
1124                    reread it as input, interpreting it normally.  */
1125                 char *oout;
1126                 int c;
1127                 int olen;
1128
1129
1130                 STARTSTACKSTR(oout);
1131                 for (;;) {
1132                         if (needprompt) {
1133                                 setprompt(2);
1134                                 needprompt = 0;
1135                         }
1136                         CHECKSTRSPACE(2, oout);
1137                         c = pgetc_linecont();
1138                         if (c == '`')
1139                                 break;
1140                         switch (c) {
1141                         case '\\':
1142                                 c = pgetc();
1143                                 if (c != '\\' && c != '`' && c != '$'
1144                                     && (!dblquote || c != '"'))
1145                                         USTPUTC('\\', oout);
1146                                 break;
1147
1148                         case '\n':
1149                                 plinno++;
1150                                 needprompt = doprompt;
1151                                 break;
1152
1153                         case PEOF:
1154                                 startlinno = plinno;
1155                                 synerror("EOF in backquote substitution");
1156                                 break;
1157
1158                         default:
1159                                 break;
1160                         }
1161                         USTPUTC(c, oout);
1162                 }
1163                 USTPUTC('\0', oout);
1164                 olen = oout - stackblock();
1165                 INTOFF;
1166                 ostr = ckmalloc(olen);
1167                 memcpy(ostr, stackblock(), olen);
1168                 setinputstring(ostr, 1);
1169                 INTON;
1170         }
1171         nlpp = pbqlist;
1172         while (*nlpp)
1173                 nlpp = &(*nlpp)->next;
1174         *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
1175         (*nlpp)->next = NULL;
1176
1177         if (oldstyle) {
1178                 saveprompt = doprompt;
1179                 doprompt = 0;
1180         }
1181
1182         n = list(0);
1183
1184         if (oldstyle) {
1185                 if (peektoken() != TEOF)
1186                         synexpect(-1);
1187                 doprompt = saveprompt;
1188         } else
1189                 consumetoken(TRP);
1190
1191         (*nlpp)->n = n;
1192         if (oldstyle) {
1193                 /*
1194                  * Start reading from old file again, ignoring any pushed back
1195                  * tokens left from the backquote parsing
1196                  */
1197                 popfile();
1198                 tokpushback = 0;
1199         }
1200         STARTSTACKSTR(out);
1201         CHECKSTRSPACE(savelen + 1, out);
1202         INTOFF;
1203         if (str) {
1204                 memcpy(out, str, savelen);
1205                 STADJUST(savelen, out);
1206                 ckfree(str);
1207                 str = NULL;
1208         }
1209         if (ostr) {
1210                 ckfree(ostr);
1211                 ostr = NULL;
1212         }
1213         here = saveheredoclist;
1214         if (here != NULL) {
1215                 while (here->next != NULL)
1216                         here = here->next;
1217                 here->next = heredoclist;
1218                 heredoclist = saveheredoclist;
1219         }
1220         handler = savehandler;
1221         INTON;
1222         if (quoted)
1223                 USTPUTC(CTLBACKQ | CTLQUOTE, out);
1224         else
1225                 USTPUTC(CTLBACKQ, out);
1226         return out;
1227 }
1228
1229
1230 /*
1231  * Called to parse a backslash escape sequence inside $'...'.
1232  * The backslash has already been read.
1233  */
1234 static char *
1235 readcstyleesc(char *out)
1236 {
1237         int c, vc, i, n;
1238         unsigned int v;
1239
1240         c = pgetc();
1241         switch (c) {
1242         case '\0':
1243                 synerror("Unterminated quoted string");
1244         case '\n':
1245                 plinno++;
1246                 if (doprompt)
1247                         setprompt(2);
1248                 else
1249                         setprompt(0);
1250                 return out;
1251         case '\\':
1252         case '\'':
1253         case '"':
1254                 v = c;
1255                 break;
1256         case 'a': v = '\a'; break;
1257         case 'b': v = '\b'; break;
1258         case 'e': v = '\033'; break;
1259         case 'f': v = '\f'; break;
1260         case 'n': v = '\n'; break;
1261         case 'r': v = '\r'; break;
1262         case 't': v = '\t'; break;
1263         case 'v': v = '\v'; break;
1264         case 'x':
1265                   v = 0;
1266                   for (;;) {
1267                           c = pgetc();
1268                           if (c >= '0' && c <= '9')
1269                                   v = (v << 4) + c - '0';
1270                           else if (c >= 'A' && c <= 'F')
1271                                   v = (v << 4) + c - 'A' + 10;
1272                           else if (c >= 'a' && c <= 'f')
1273                                   v = (v << 4) + c - 'a' + 10;
1274                           else
1275                                   break;
1276                   }
1277                   pungetc();
1278                   break;
1279         case '0': case '1': case '2': case '3':
1280         case '4': case '5': case '6': case '7':
1281                   v = c - '0';
1282                   c = pgetc();
1283                   if (c >= '0' && c <= '7') {
1284                           v <<= 3;
1285                           v += c - '0';
1286                           c = pgetc();
1287                           if (c >= '0' && c <= '7') {
1288                                   v <<= 3;
1289                                   v += c - '0';
1290                           } else
1291                                   pungetc();
1292                   } else
1293                           pungetc();
1294                   break;
1295         case 'c':
1296                   c = pgetc();
1297                   if (c < 0x3f || c > 0x7a || c == 0x60)
1298                           synerror("Bad escape sequence");
1299                   if (c == '\\' && pgetc() != '\\')
1300                           synerror("Bad escape sequence");
1301                   if (c == '?')
1302                           v = 127;
1303                   else
1304                           v = c & 0x1f;
1305                   break;
1306         case 'u':
1307         case 'U':
1308                   n = c == 'U' ? 8 : 4;
1309                   v = 0;
1310                   for (i = 0; i < n; i++) {
1311                           c = pgetc();
1312                           if (c >= '0' && c <= '9')
1313                                   v = (v << 4) + c - '0';
1314                           else if (c >= 'A' && c <= 'F')
1315                                   v = (v << 4) + c - 'A' + 10;
1316                           else if (c >= 'a' && c <= 'f')
1317                                   v = (v << 4) + c - 'a' + 10;
1318                           else
1319                                   synerror("Bad escape sequence");
1320                   }
1321                   if (v == 0 || (v >= 0xd800 && v <= 0xdfff))
1322                           synerror("Bad escape sequence");
1323                   /* We really need iconv here. */
1324                   if (initial_localeisutf8 && v > 127) {
1325                           CHECKSTRSPACE(4, out);
1326                           /*
1327                            * We cannot use wctomb() as the locale may have
1328                            * changed.
1329                            */
1330                           if (v <= 0x7ff) {
1331                                   USTPUTC(0xc0 | v >> 6, out);
1332                                   USTPUTC(0x80 | (v & 0x3f), out);
1333                                   return out;
1334                           } else if (v <= 0xffff) {
1335                                   USTPUTC(0xe0 | v >> 12, out);
1336                                   USTPUTC(0x80 | ((v >> 6) & 0x3f), out);
1337                                   USTPUTC(0x80 | (v & 0x3f), out);
1338                                   return out;
1339                           } else if (v <= 0x10ffff) {
1340                                   USTPUTC(0xf0 | v >> 18, out);
1341                                   USTPUTC(0x80 | ((v >> 12) & 0x3f), out);
1342                                   USTPUTC(0x80 | ((v >> 6) & 0x3f), out);
1343                                   USTPUTC(0x80 | (v & 0x3f), out);
1344                                   return out;
1345                           }
1346                   }
1347                   if (v > 127)
1348                           v = '?';
1349                   break;
1350         default:
1351                   synerror("Bad escape sequence");
1352         }
1353         vc = (char)v;
1354         /*
1355          * We can't handle NUL bytes.
1356          * POSIX says we should skip till the closing quote.
1357          */
1358         if (vc == '\0') {
1359                 while ((c = pgetc()) != '\'') {
1360                         if (c == '\\')
1361                                 c = pgetc();
1362                         if (c == PEOF)
1363                                 synerror("Unterminated quoted string");
1364                         if (c == '\n') {
1365                                 plinno++;
1366                                 if (doprompt)
1367                                         setprompt(2);
1368                                 else
1369                                         setprompt(0);
1370                         }
1371                 }
1372                 pungetc();
1373                 return out;
1374         }
1375         if (SQSYNTAX[vc] == CCTL)
1376                 USTPUTC(CTLESC, out);
1377         USTPUTC(vc, out);
1378         return out;
1379 }
1380
1381
1382 /*
1383  * If eofmark is NULL, read a word or a redirection symbol.  If eofmark
1384  * is not NULL, read a here document.  In the latter case, eofmark is the
1385  * word which marks the end of the document and striptabs is true if
1386  * leading tabs should be stripped from the document.  The argument firstc
1387  * is the first character of the input token or document.
1388  *
1389  * Because C does not have internal subroutines, I have simulated them
1390  * using goto's to implement the subroutine linkage.  The following macros
1391  * will run code that appears at the end of readtoken1.
1392  */
1393
1394 #define PARSESUB()      {goto parsesub; parsesub_return:;}
1395 #define PARSEARITH()    {goto parsearith; parsearith_return:;}
1396
1397 static int
1398 readtoken1(int firstc, char const *initialsyntax, const char *eofmark,
1399     int striptabs)
1400 {
1401         int c = firstc;
1402         char *out;
1403         int len;
1404         struct nodelist *bqlist;
1405         int quotef;
1406         int newvarnest;
1407         int level;
1408         int synentry;
1409         struct tokenstate state_static[MAXNEST_static];
1410         int maxnest = MAXNEST_static;
1411         struct tokenstate *state = state_static;
1412         int sqiscstyle = 0;
1413
1414         startlinno = plinno;
1415         quotef = 0;
1416         bqlist = NULL;
1417         newvarnest = 0;
1418         level = 0;
1419         state[level].syntax = initialsyntax;
1420         state[level].parenlevel = 0;
1421         state[level].category = TSTATE_TOP;
1422
1423         STARTSTACKSTR(out);
1424         loop: { /* for each line, until end of word */
1425                 if (eofmark && eofmark != NOEOFMARK)
1426                         /* set c to PEOF if at end of here document */
1427                         c = checkend(c, eofmark, striptabs);
1428                 for (;;) {      /* until end of line or end of word */
1429                         CHECKSTRSPACE(4, out);  /* permit 4 calls to USTPUTC */
1430
1431                         synentry = state[level].syntax[c];
1432
1433                         switch(synentry) {
1434                         case CNL:       /* '\n' */
1435                                 if (level == 0)
1436                                         goto endword;   /* exit outer loop */
1437                                 /* FALLTHROUGH */
1438                         case CQNL:
1439                                 USTPUTC(c, out);
1440                                 plinno++;
1441                                 if (doprompt)
1442                                         setprompt(2);
1443                                 else
1444                                         setprompt(0);
1445                                 c = pgetc();
1446                                 goto loop;              /* continue outer loop */
1447                         case CSBACK:
1448                                 if (sqiscstyle) {
1449                                         out = readcstyleesc(out);
1450                                         break;
1451                                 }
1452                                 /* FALLTHROUGH */
1453                         case CWORD:
1454                                 USTPUTC(c, out);
1455                                 break;
1456                         case CCTL:
1457                                 if (eofmark == NULL || initialsyntax != SQSYNTAX)
1458                                         USTPUTC(CTLESC, out);
1459                                 USTPUTC(c, out);
1460                                 break;
1461                         case CBACK:     /* backslash */
1462                                 c = pgetc();
1463                                 if (c == PEOF) {
1464                                         USTPUTC('\\', out);
1465                                         pungetc();
1466                                 } else if (c == '\n') {
1467                                         plinno++;
1468                                         if (doprompt)
1469                                                 setprompt(2);
1470                                         else
1471                                                 setprompt(0);
1472                                 } else {
1473                                         if (state[level].syntax == DQSYNTAX &&
1474                                             c != '\\' && c != '`' && c != '$' &&
1475                                             (c != '"' || (eofmark != NULL &&
1476                                                 newvarnest == 0)) &&
1477                                             (c != '}' || state[level].category != TSTATE_VAR_OLD))
1478                                                 USTPUTC('\\', out);
1479                                         if ((eofmark == NULL ||
1480                                             newvarnest > 0) &&
1481                                             state[level].syntax == BASESYNTAX)
1482                                                 USTPUTC(CTLQUOTEMARK, out);
1483                                         if (SQSYNTAX[c] == CCTL)
1484                                                 USTPUTC(CTLESC, out);
1485                                         USTPUTC(c, out);
1486                                         if ((eofmark == NULL ||
1487                                             newvarnest > 0) &&
1488                                             state[level].syntax == BASESYNTAX &&
1489                                             state[level].category == TSTATE_VAR_OLD)
1490                                                 USTPUTC(CTLQUOTEEND, out);
1491                                         quotef++;
1492                                 }
1493                                 break;
1494                         case CSQUOTE:
1495                                 USTPUTC(CTLQUOTEMARK, out);
1496                                 state[level].syntax = SQSYNTAX;
1497                                 sqiscstyle = 0;
1498                                 break;
1499                         case CDQUOTE:
1500                                 USTPUTC(CTLQUOTEMARK, out);
1501                                 state[level].syntax = DQSYNTAX;
1502                                 break;
1503                         case CENDQUOTE:
1504                                 if (eofmark != NULL && newvarnest == 0)
1505                                         USTPUTC(c, out);
1506                                 else {
1507                                         if (state[level].category == TSTATE_VAR_OLD)
1508                                                 USTPUTC(CTLQUOTEEND, out);
1509                                         state[level].syntax = BASESYNTAX;
1510                                         quotef++;
1511                                 }
1512                                 break;
1513                         case CVAR:      /* '$' */
1514                                 PARSESUB();             /* parse substitution */
1515                                 break;
1516                         case CENDVAR:   /* '}' */
1517                                 if (level > 0 &&
1518                                     ((state[level].category == TSTATE_VAR_OLD &&
1519                                       state[level].syntax ==
1520                                       state[level - 1].syntax) ||
1521                                     (state[level].category == TSTATE_VAR_NEW &&
1522                                      state[level].syntax == BASESYNTAX))) {
1523                                         if (state[level].category == TSTATE_VAR_NEW)
1524                                                 newvarnest--;
1525                                         level--;
1526                                         USTPUTC(CTLENDVAR, out);
1527                                 } else {
1528                                         USTPUTC(c, out);
1529                                 }
1530                                 break;
1531                         case CLP:       /* '(' in arithmetic */
1532                                 state[level].parenlevel++;
1533                                 USTPUTC(c, out);
1534                                 break;
1535                         case CRP:       /* ')' in arithmetic */
1536                                 if (state[level].parenlevel > 0) {
1537                                         USTPUTC(c, out);
1538                                         --state[level].parenlevel;
1539                                 } else {
1540                                         if (pgetc_linecont() == ')') {
1541                                                 if (level > 0 &&
1542                                                     state[level].category == TSTATE_ARITH) {
1543                                                         level--;
1544                                                         USTPUTC(CTLENDARI, out);
1545                                                 } else
1546                                                         USTPUTC(')', out);
1547                                         } else {
1548                                                 /*
1549                                                  * unbalanced parens
1550                                                  *  (don't 2nd guess - no error)
1551                                                  */
1552                                                 pungetc();
1553                                                 USTPUTC(')', out);
1554                                         }
1555                                 }
1556                                 break;
1557                         case CBQUOTE:   /* '`' */
1558                                 out = parsebackq(out, &bqlist, 1,
1559                                     state[level].syntax == DQSYNTAX &&
1560                                     (eofmark == NULL || newvarnest > 0),
1561                                     state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX);
1562                                 break;
1563                         case CEOF:
1564                                 goto endword;           /* exit outer loop */
1565                         case CIGN:
1566                                 break;
1567                         default:
1568                                 if (level == 0)
1569                                         goto endword;   /* exit outer loop */
1570                                 USTPUTC(c, out);
1571                         }
1572                         c = pgetc_macro();
1573                 }
1574         }
1575 endword:
1576         if (state[level].syntax == ARISYNTAX)
1577                 synerror("Missing '))'");
1578         if (state[level].syntax != BASESYNTAX && eofmark == NULL)
1579                 synerror("Unterminated quoted string");
1580         if (state[level].category == TSTATE_VAR_OLD ||
1581             state[level].category == TSTATE_VAR_NEW) {
1582                 startlinno = plinno;
1583                 synerror("Missing '}'");
1584         }
1585         if (state != state_static)
1586                 parser_temp_free_upto(state);
1587         USTPUTC('\0', out);
1588         len = out - stackblock();
1589         out = stackblock();
1590         if (eofmark == NULL) {
1591                 if ((c == '>' || c == '<')
1592                  && quotef == 0
1593                  && len <= 2
1594                  && (*out == '\0' || is_digit(*out))) {
1595                         parseredir(out, c);
1596                         return lasttoken = TREDIR;
1597                 } else {
1598                         pungetc();
1599                 }
1600         }
1601         quoteflag = quotef;
1602         backquotelist = bqlist;
1603         grabstackblock(len);
1604         wordtext = out;
1605         return lasttoken = TWORD;
1606 /* end of readtoken routine */
1607
1608
1609 /*
1610  * Parse a substitution.  At this point, we have read the dollar sign
1611  * and nothing else.
1612  */
1613
1614 parsesub: {
1615         int subtype;
1616         int typeloc;
1617         int flags;
1618         char *p;
1619         static const char types[] = "}-+?=";
1620         int linno;
1621         int length;
1622         int c1;
1623
1624         c = pgetc_linecont();
1625         if (c == '(') { /* $(command) or $((arith)) */
1626                 if (pgetc_linecont() == '(') {
1627                         PARSEARITH();
1628                 } else {
1629                         pungetc();
1630                         out = parsebackq(out, &bqlist, 0,
1631                             state[level].syntax == DQSYNTAX &&
1632                             (eofmark == NULL || newvarnest > 0),
1633                             state[level].syntax == DQSYNTAX ||
1634                             state[level].syntax == ARISYNTAX);
1635                 }
1636         } else if (c == '{' || is_name(c) || is_special(c)) {
1637                 USTPUTC(CTLVAR, out);
1638                 typeloc = out - stackblock();
1639                 USTPUTC(VSNORMAL, out);
1640                 subtype = VSNORMAL;
1641                 flags = 0;
1642                 if (c == '{') {
1643                         c = pgetc_linecont();
1644                         subtype = 0;
1645                 }
1646 varname:
1647                 if (!is_eof(c) && is_name(c)) {
1648                         length = 0;
1649                         do {
1650                                 STPUTC(c, out);
1651                                 c = pgetc_linecont();
1652                                 length++;
1653                         } while (!is_eof(c) && is_in_name(c));
1654                         if (length == 6 &&
1655                             strncmp(out - length, "LINENO", length) == 0) {
1656                                 /* Replace the variable name with the
1657                                  * current line number. */
1658                                 STADJUST(-6, out);
1659                                 CHECKSTRSPACE(11, out);
1660                                 linno = plinno;
1661                                 if (funclinno != 0)
1662                                         linno -= funclinno - 1;
1663                                 length = snprintf(out, 11, "%d", linno);
1664                                 if (length > 10)
1665                                         length = 10;
1666                                 out += length;
1667                                 flags |= VSLINENO;
1668                         }
1669                 } else if (is_digit(c)) {
1670                         if (subtype != VSNORMAL) {
1671                                 do {
1672                                         STPUTC(c, out);
1673                                         c = pgetc_linecont();
1674                                 } while (is_digit(c));
1675                         } else {
1676                                 USTPUTC(c, out);
1677                                 c = pgetc_linecont();
1678                         }
1679                 } else if (is_special(c)) {
1680                         c1 = c;
1681                         c = pgetc_linecont();
1682                         if (subtype == 0 && c1 == '#') {
1683                                 subtype = VSLENGTH;
1684                                 if (strchr(types, c) == NULL && c != ':' &&
1685                                     c != '#' && c != '%')
1686                                         goto varname;
1687                                 c1 = c;
1688                                 c = pgetc_linecont();
1689                                 if (c1 != '}' && c == '}') {
1690                                         pungetc();
1691                                         c = c1;
1692                                         goto varname;
1693                                 }
1694                                 pungetc();
1695                                 c = c1;
1696                                 c1 = '#';
1697                                 subtype = 0;
1698                         }
1699                         USTPUTC(c1, out);
1700                 } else {
1701                         subtype = VSERROR;
1702                         if (c == '}')
1703                                 pungetc();
1704                         else if (c == '\n' || c == PEOF)
1705                                 synerror("Unexpected end of line in substitution");
1706                         else if (BASESYNTAX[c] != CCTL)
1707                                 USTPUTC(c, out);
1708                 }
1709                 if (subtype == 0) {
1710                         switch (c) {
1711                         case ':':
1712                                 flags |= VSNUL;
1713                                 c = pgetc_linecont();
1714                                 /*FALLTHROUGH*/
1715                         default:
1716                                 p = strchr(types, c);
1717                                 if (p == NULL) {
1718                                         if (c == '\n' || c == PEOF)
1719                                                 synerror("Unexpected end of line in substitution");
1720                                         if (flags == VSNUL)
1721                                                 STPUTC(':', out);
1722                                         if (BASESYNTAX[c] != CCTL)
1723                                                 STPUTC(c, out);
1724                                         subtype = VSERROR;
1725                                 } else
1726                                         subtype = p - types + VSNORMAL;
1727                                 break;
1728                         case '%':
1729                         case '#':
1730                                 {
1731                                         int cc = c;
1732                                         subtype = c == '#' ? VSTRIMLEFT :
1733                                                              VSTRIMRIGHT;
1734                                         c = pgetc_linecont();
1735                                         if (c == cc)
1736                                                 subtype++;
1737                                         else
1738                                                 pungetc();
1739                                         break;
1740                                 }
1741                         }
1742                 } else if (subtype != VSERROR) {
1743                         if (subtype == VSLENGTH && c != '}')
1744                                 subtype = VSERROR;
1745                         pungetc();
1746                 }
1747                 STPUTC('=', out);
1748                 if (state[level].syntax == DQSYNTAX ||
1749                     state[level].syntax == ARISYNTAX)
1750                         flags |= VSQUOTE;
1751                 *(stackblock() + typeloc) = subtype | flags;
1752                 if (subtype != VSNORMAL) {
1753                         if (level + 1 >= maxnest) {
1754                                 maxnest *= 2;
1755                                 if (state == state_static) {
1756                                         state = parser_temp_alloc(
1757                                             maxnest * sizeof(*state));
1758                                         memcpy(state, state_static,
1759                                             MAXNEST_static * sizeof(*state));
1760                                 } else
1761                                         state = parser_temp_realloc(state,
1762                                             maxnest * sizeof(*state));
1763                         }
1764                         level++;
1765                         state[level].parenlevel = 0;
1766                         if (subtype == VSMINUS || subtype == VSPLUS ||
1767                             subtype == VSQUESTION || subtype == VSASSIGN) {
1768                                 /*
1769                                  * For operators that were in the Bourne shell,
1770                                  * inherit the double-quote state.
1771                                  */
1772                                 state[level].syntax = state[level - 1].syntax;
1773                                 state[level].category = TSTATE_VAR_OLD;
1774                         } else {
1775                                 /*
1776                                  * The other operators take a pattern,
1777                                  * so go to BASESYNTAX.
1778                                  * Also, ' and " are now special, even
1779                                  * in here documents.
1780                                  */
1781                                 state[level].syntax = BASESYNTAX;
1782                                 state[level].category = TSTATE_VAR_NEW;
1783                                 newvarnest++;
1784                         }
1785                 }
1786         } else if (c == '\'' && state[level].syntax == BASESYNTAX) {
1787                 /* $'cstylequotes' */
1788                 USTPUTC(CTLQUOTEMARK, out);
1789                 state[level].syntax = SQSYNTAX;
1790                 sqiscstyle = 1;
1791         } else {
1792                 USTPUTC('$', out);
1793                 pungetc();
1794         }
1795         goto parsesub_return;
1796 }
1797
1798
1799 /*
1800  * Parse an arithmetic expansion (indicate start of one and set state)
1801  */
1802 parsearith: {
1803
1804         if (level + 1 >= maxnest) {
1805                 maxnest *= 2;
1806                 if (state == state_static) {
1807                         state = parser_temp_alloc(
1808                             maxnest * sizeof(*state));
1809                         memcpy(state, state_static,
1810                             MAXNEST_static * sizeof(*state));
1811                 } else
1812                         state = parser_temp_realloc(state,
1813                             maxnest * sizeof(*state));
1814         }
1815         level++;
1816         state[level].syntax = ARISYNTAX;
1817         state[level].parenlevel = 0;
1818         state[level].category = TSTATE_ARITH;
1819         USTPUTC(CTLARI, out);
1820         if (state[level - 1].syntax == DQSYNTAX)
1821                 USTPUTC('"',out);
1822         else
1823                 USTPUTC(' ',out);
1824         goto parsearith_return;
1825 }
1826
1827 } /* end of readtoken */
1828
1829
1830 /*
1831  * Returns true if the text contains nothing to expand (no dollar signs
1832  * or backquotes).
1833  */
1834
1835 static int
1836 noexpand(char *text)
1837 {
1838         char *p;
1839         char c;
1840
1841         p = text;
1842         while ((c = *p++) != '\0') {
1843                 if ( c == CTLQUOTEMARK)
1844                         continue;
1845                 if (c == CTLESC)
1846                         p++;
1847                 else if (BASESYNTAX[(int)c] == CCTL)
1848                         return 0;
1849         }
1850         return 1;
1851 }
1852
1853
1854 /*
1855  * Return true if the argument is a legal variable name (a letter or
1856  * underscore followed by zero or more letters, underscores, and digits).
1857  */
1858
1859 int
1860 goodname(const char *name)
1861 {
1862         const char *p;
1863
1864         p = name;
1865         if (! is_name(*p))
1866                 return 0;
1867         while (*++p) {
1868                 if (! is_in_name(*p))
1869                         return 0;
1870         }
1871         return 1;
1872 }
1873
1874
1875 int
1876 isassignment(const char *p)
1877 {
1878         if (!is_name(*p))
1879                 return 0;
1880         p++;
1881         for (;;) {
1882                 if (*p == '=')
1883                         return 1;
1884                 else if (!is_in_name(*p))
1885                         return 0;
1886                 p++;
1887         }
1888 }
1889
1890
1891 static void
1892 consumetoken(int token)
1893 {
1894         if (readtoken() != token)
1895                 synexpect(token);
1896 }
1897
1898
1899 /*
1900  * Called when an unexpected token is read during the parse.  The argument
1901  * is the token that is expected, or -1 if more than one type of token can
1902  * occur at this point.
1903  */
1904
1905 static void
1906 synexpect(int token)
1907 {
1908         char msg[64];
1909
1910         if (token >= 0) {
1911                 fmtstr(msg, 64, "%s unexpected (expecting %s)",
1912                         tokname[lasttoken], tokname[token]);
1913         } else {
1914                 fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
1915         }
1916         synerror(msg);
1917 }
1918
1919
1920 static void
1921 synerror(const char *msg)
1922 {
1923         if (commandname)
1924                 outfmt(out2, "%s: %d: ", commandname, startlinno);
1925         else if (arg0)
1926                 outfmt(out2, "%s: ", arg0);
1927         outfmt(out2, "Syntax error: %s\n", msg);
1928         error((char *)NULL);
1929 }
1930
1931 static void
1932 setprompt(int which)
1933 {
1934         whichprompt = which;
1935         if (which == 0)
1936                 return;
1937
1938 #ifndef NO_HISTORY
1939         if (!el)
1940 #endif
1941         {
1942                 out2str(getprompt(NULL));
1943                 flushout(out2);
1944         }
1945 }
1946
1947 static int
1948 pgetc_linecont(void)
1949 {
1950         int c;
1951
1952         while ((c = pgetc_macro()) == '\\') {
1953                 c = pgetc();
1954                 if (c == '\n') {
1955                         plinno++;
1956                         if (doprompt)
1957                                 setprompt(2);
1958                         else
1959                                 setprompt(0);
1960                 } else {
1961                         pungetc();
1962                         /* Allow the backslash to be pushed back. */
1963                         pushstring("\\", 1, NULL);
1964                         return (pgetc());
1965                 }
1966         }
1967         return (c);
1968 }
1969
1970
1971 static struct passwd *
1972 getpwlogin(void)
1973 {
1974         const char *login;
1975
1976         login = getlogin();
1977         if (login == NULL)
1978                 return (NULL);
1979
1980         return (getpwnam(login));
1981 }
1982
1983
1984 static void
1985 getusername(char *name, size_t namelen)
1986 {
1987         static char cached_name[MAXLOGNAME];
1988         struct passwd *pw;
1989         uid_t euid;
1990
1991         if (cached_name[0] == '\0') {
1992                 euid = geteuid();
1993
1994                 /*
1995                  * Handle the case when there is more than one
1996                  * login with the same UID, or when the login
1997                  * returned by getlogin(2) does no longer match
1998                  * the current UID.
1999                  */
2000                 pw = getpwlogin();
2001                 if (pw == NULL || pw->pw_uid != euid)
2002                         pw = getpwuid(euid);
2003
2004                 if (pw != NULL) {
2005                         strlcpy(cached_name, pw->pw_name,
2006                             sizeof(cached_name));
2007                 } else {
2008                         snprintf(cached_name, sizeof(cached_name),
2009                             "%u", euid);
2010                 }
2011         }
2012
2013         strlcpy(name, cached_name, namelen);
2014 }
2015
2016
2017 /*
2018  * called by editline -- any expansions to the prompt
2019  *    should be added here.
2020  */
2021 char *
2022 getprompt(void *unused __unused)
2023 {
2024         static char ps[PROMPTLEN];
2025         const char *fmt;
2026         const char *home;
2027         const char *pwd;
2028         size_t homelen;
2029         int i, trim;
2030         static char internal_error[] = "??";
2031
2032         /*
2033          * Select prompt format.
2034          */
2035         switch (whichprompt) {
2036         case 0:
2037                 fmt = "";
2038                 break;
2039         case 1:
2040                 fmt = ps1val();
2041                 break;
2042         case 2:
2043                 fmt = ps2val();
2044                 break;
2045         default:
2046                 return internal_error;
2047         }
2048
2049         /*
2050          * Format prompt string.
2051          */
2052         for (i = 0; (i < PROMPTLEN - 1) && (*fmt != '\0'); i++, fmt++) {
2053                 if (*fmt != '\\') {
2054                         ps[i] = *fmt;
2055                         continue;
2056                 }
2057
2058                 switch (*++fmt) {
2059
2060                 /*
2061                  * Non-printing sequence begin and end.
2062                  */
2063                 case '[':
2064                 case ']':
2065                         ps[i] = '\001';
2066                         break;
2067
2068                 /*
2069                  * Literal \ and some ASCII characters:
2070                  * \a   BEL
2071                  * \e   ESC
2072                  * \r   CR
2073                  */
2074                 case '\\':
2075                 case 'a':
2076                 case 'e':
2077                 case 'r':
2078                         if (*fmt == 'a')
2079                                 ps[i] = '\007';
2080                         else if (*fmt == 'e')
2081                                 ps[i] = '\033';
2082                         else if (*fmt == 'r')
2083                                 ps[i] = '\r';
2084                         else
2085                                 ps[i] = '\\';
2086                         break;
2087
2088                 /*
2089                  * CRLF sequence
2090                  */
2091                 case 'n':
2092                         if (i < PROMPTLEN - 3) {
2093                                 ps[i++] = '\r';
2094                                 ps[i] = '\n';
2095                         }
2096                         break;
2097
2098                 /*
2099                  * Print the current time as per provided strftime format.
2100                  */
2101                 case 'D': {
2102                         char tfmt[128] = "%X"; /* \D{} means %X. */
2103                         struct tm *now;
2104
2105                         if (fmt[1] != '{') {
2106                                 /*
2107                                  * "\D" but not "\D{", so treat the '\'
2108                                  * literally and rewind fmt to treat 'D'
2109                                  * literally next iteration.
2110                                  */
2111                                 ps[i] = '\\';
2112                                 fmt--;
2113                                 break;
2114                         }
2115                         fmt += 2; /* Consume "D{". */
2116                         if (fmt[0] != '}') {
2117                                 char *end;
2118
2119                                 end = memccpy(tfmt, fmt, '}', sizeof(tfmt));
2120                                 if (end == NULL) {
2121                                         /*
2122                                          * Format too long or no '}', so
2123                                          * ignore "\D{" altogether.
2124                                          * The loop will do i++, but nothing
2125                                          * was written to ps, so do i-- here.
2126                                          * Rewind fmt for similar reason.
2127                                          */
2128                                         i--;
2129                                         fmt--;
2130                                         break;
2131                                 }
2132                                 *--end = '\0'; /* Ignore the copy of '}'. */
2133                                 fmt += end - tfmt;
2134                         }
2135                         now = localtime(&(time_t){time(NULL)});
2136                         i += strftime(&ps[i], PROMPTLEN - i - 1, tfmt, now);
2137                         i--; /* The loop will do i++. */
2138                         break;
2139                 }
2140
2141                 /*
2142                  * Hostname.
2143                  *
2144                  * \h specifies just the local hostname,
2145                  * \H specifies fully-qualified hostname.
2146                  */
2147                 case 'h':
2148                 case 'H':
2149                         ps[i] = '\0';
2150                         gethostname(&ps[i], PROMPTLEN - i - 1);
2151                         ps[PROMPTLEN - 1] = '\0';
2152                         /* Skip to end of hostname. */
2153                         trim = (*fmt == 'h') ? '.' : '\0';
2154                         while ((ps[i] != '\0') && (ps[i] != trim))
2155                                 i++;
2156                         --i;
2157                         break;
2158
2159                 /*
2160                  * User name.
2161                  */
2162                 case 'u':
2163                         ps[i] = '\0';
2164                         getusername(&ps[i], PROMPTLEN - i);
2165                         /* Skip to end of username. */
2166                         while (ps[i + 1] != '\0')
2167                                 i++;
2168                         break;
2169
2170                 /*
2171                  * Working directory.
2172                  *
2173                  * \W specifies just the final component,
2174                  * \w specifies the entire path.
2175                  */
2176                 case 'W':
2177                 case 'w':
2178                         pwd = lookupvar("PWD");
2179                         if (pwd == NULL || *pwd == '\0')
2180                                 pwd = "?";
2181                         if (*fmt == 'W' &&
2182                             *pwd == '/' && pwd[1] != '\0')
2183                                 strlcpy(&ps[i], strrchr(pwd, '/') + 1,
2184                                     PROMPTLEN - i);
2185                         else {
2186                                 home = lookupvar("HOME");
2187                                 if (home != NULL)
2188                                         homelen = strlen(home);
2189                                 if (home != NULL &&
2190                                     strcmp(home, "/") != 0 &&
2191                                     strncmp(pwd, home, homelen) == 0 &&
2192                                     (pwd[homelen] == '/' ||
2193                                     pwd[homelen] == '\0')) {
2194                                         strlcpy(&ps[i], "~",
2195                                             PROMPTLEN - i);
2196                                         strlcpy(&ps[i + 1],
2197                                             pwd + homelen,
2198                                             PROMPTLEN - i - 1);
2199                                 } else {
2200                                         strlcpy(&ps[i], pwd, PROMPTLEN - i);
2201                                 }
2202                         }
2203                         /* Skip to end of path. */
2204                         while (ps[i + 1] != '\0')
2205                                 i++;
2206                         break;
2207
2208                 /*
2209                  * Superuser status.
2210                  *
2211                  * '$' for normal users, '#' for root.
2212                  */
2213                 case '$':
2214                         ps[i] = (geteuid() != 0) ? '$' : '#';
2215                         break;
2216
2217                 /*
2218                  * Emit unrecognized formats verbatim.
2219                  */
2220                 default:
2221                         ps[i] = '\\';
2222                         if (i < PROMPTLEN - 2)
2223                                 ps[++i] = *fmt;
2224                         break;
2225                 }
2226
2227         }
2228         ps[i] = '\0';
2229         return (ps);
2230 }
2231
2232
2233 const char *
2234 expandstr(const char *ps)
2235 {
2236         union node n;
2237         struct jmploc jmploc;
2238         struct jmploc *const savehandler = handler;
2239         const int saveprompt = doprompt;
2240         struct parsefile *const savetopfile = getcurrentfile();
2241         struct parser_temp *const saveparser_temp = parser_temp;
2242         const char *result = NULL;
2243
2244         if (!setjmp(jmploc.loc)) {
2245                 handler = &jmploc;
2246                 parser_temp = NULL;
2247                 setinputstring(ps, 1);
2248                 doprompt = 0;
2249                 readtoken1(pgetc(), DQSYNTAX, NOEOFMARK, 0);
2250                 if (backquotelist != NULL)
2251                         error("Command substitution not allowed here");
2252
2253                 n.narg.type = NARG;
2254                 n.narg.next = NULL;
2255                 n.narg.text = wordtext;
2256                 n.narg.backquote = backquotelist;
2257
2258                 expandarg(&n, NULL, 0);
2259                 result = stackblock();
2260                 INTOFF;
2261         }
2262         handler = savehandler;
2263         doprompt = saveprompt;
2264         popfilesupto(savetopfile);
2265         if (parser_temp != saveparser_temp) {
2266                 parser_temp_free_all();
2267                 parser_temp = saveparser_temp;
2268         }
2269         if (result != NULL) {
2270                 INTON;
2271         } else if (exception == EXINT)
2272                 raise(SIGINT);
2273         return result;
2274 }