expand.c revision 316942
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1997-2005 5 * Herbert Xu <herbert@gondor.apana.org.au>. 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 * 4. 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#ifndef lint 36#if 0 37static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 38#endif 39#endif /* not lint */ 40#include <sys/cdefs.h> 41__FBSDID("$FreeBSD: stable/10/bin/sh/expand.c 316942 2017-04-14 21:42:27Z jilles $"); 42 43#include <sys/types.h> 44#include <sys/time.h> 45#include <sys/stat.h> 46#include <dirent.h> 47#include <errno.h> 48#include <inttypes.h> 49#include <limits.h> 50#include <pwd.h> 51#include <stdio.h> 52#include <stdlib.h> 53#include <string.h> 54#include <unistd.h> 55#include <wchar.h> 56#include <wctype.h> 57 58/* 59 * Routines to expand arguments to commands. We have to deal with 60 * backquotes, shell variables, and file metacharacters. 61 */ 62 63#include "shell.h" 64#include "main.h" 65#include "nodes.h" 66#include "eval.h" 67#include "expand.h" 68#include "syntax.h" 69#include "parser.h" 70#include "jobs.h" 71#include "options.h" 72#include "var.h" 73#include "input.h" 74#include "output.h" 75#include "memalloc.h" 76#include "error.h" 77#include "mystring.h" 78#include "arith.h" 79#include "show.h" 80#include "builtins.h" 81 82/* 83 * Structure specifying which parts of the string should be searched 84 * for IFS characters. 85 */ 86 87struct ifsregion { 88 struct ifsregion *next; /* next region in list */ 89 int begoff; /* offset of start of region */ 90 int endoff; /* offset of end of region */ 91 int inquotes; /* search for nul bytes only */ 92}; 93 94 95static char *expdest; /* output of current string */ 96static struct nodelist *argbackq; /* list of back quote expressions */ 97static struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 98static struct ifsregion *ifslastp; /* last struct in list */ 99static struct arglist exparg; /* holds expanded arg list */ 100 101static char *argstr(char *, int); 102static char *exptilde(char *, int); 103static char *expari(char *); 104static void expbackq(union node *, int, int); 105static int subevalvar(char *, char *, int, int, int, int, int); 106static char *evalvar(char *, int); 107static int varisset(const char *, int); 108static void strtodest(const char *, int, int, int); 109static void varvalue(const char *, int, int, int); 110static void recordregion(int, int, int); 111static void removerecordregions(int); 112static void ifsbreakup(char *, struct arglist *); 113static void expandmeta(struct strlist *); 114static void expmeta(char *, char *); 115static void addfname(char *); 116static struct strlist *expsort(struct strlist *); 117static struct strlist *msort(struct strlist *, int); 118static int patmatch(const char *, const char *, int); 119static char *cvtnum(int, char *); 120static int collate_range_cmp(wchar_t, wchar_t); 121 122static int 123collate_range_cmp(wchar_t c1, wchar_t c2) 124{ 125 static wchar_t s1[2], s2[2]; 126 127 s1[0] = c1; 128 s2[0] = c2; 129 return (wcscoll(s1, s2)); 130} 131 132static char * 133stputs_quotes(const char *data, const char *syntax, char *p) 134{ 135 while (*data) { 136 CHECKSTRSPACE(2, p); 137 if (syntax[(int)*data] == CCTL) 138 USTPUTC(CTLESC, p); 139 USTPUTC(*data++, p); 140 } 141 return (p); 142} 143#define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) 144 145/* 146 * Perform expansions on an argument, placing the resulting list of arguments 147 * in arglist. Parameter expansion, command substitution and arithmetic 148 * expansion are always performed; additional expansions can be requested 149 * via flag (EXP_*). 150 * The result is left in the stack string. 151 * When arglist is NULL, perform here document expansion. 152 * 153 * Caution: this function uses global state and is not reentrant. 154 * However, a new invocation after an interrupted invocation is safe 155 * and will reset the global state for the new call. 156 */ 157void 158expandarg(union node *arg, struct arglist *arglist, int flag) 159{ 160 struct strlist *sp; 161 char *p; 162 163 argbackq = arg->narg.backquote; 164 STARTSTACKSTR(expdest); 165 ifsfirst.next = NULL; 166 ifslastp = NULL; 167 argstr(arg->narg.text, flag); 168 if (arglist == NULL) { 169 STACKSTRNUL(expdest); 170 return; /* here document expanded */ 171 } 172 STPUTC('\0', expdest); 173 p = grabstackstr(expdest); 174 exparg.lastp = &exparg.list; 175 if (flag & EXP_FULL) { 176 ifsbreakup(p, &exparg); 177 *exparg.lastp = NULL; 178 exparg.lastp = &exparg.list; 179 expandmeta(exparg.list); 180 } else { 181 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 182 sp->text = p; 183 *exparg.lastp = sp; 184 exparg.lastp = &sp->next; 185 } 186 while (ifsfirst.next != NULL) { 187 struct ifsregion *ifsp; 188 INTOFF; 189 ifsp = ifsfirst.next->next; 190 ckfree(ifsfirst.next); 191 ifsfirst.next = ifsp; 192 INTON; 193 } 194 *exparg.lastp = NULL; 195 if (exparg.list) { 196 *arglist->lastp = exparg.list; 197 arglist->lastp = exparg.lastp; 198 } 199} 200 201 202 203/* 204 * Perform parameter expansion, command substitution and arithmetic 205 * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 206 * Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'. 207 * This is used to expand word in ${var+word} etc. 208 * If EXP_FULL or EXP_CASE are set, keep and/or generate CTLESC 209 * characters to allow for further processing. 210 * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 211 */ 212static char * 213argstr(char *p, int flag) 214{ 215 char c; 216 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */ 217 int firsteq = 1; 218 int split_lit; 219 int lit_quoted; 220 221 split_lit = flag & EXP_SPLIT_LIT; 222 lit_quoted = flag & EXP_LIT_QUOTED; 223 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 224 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 225 p = exptilde(p, flag); 226 for (;;) { 227 CHECKSTRSPACE(2, expdest); 228 switch (c = *p++) { 229 case '\0': 230 return (p - 1); 231 case CTLENDVAR: 232 case CTLENDARI: 233 return (p); 234 case CTLQUOTEMARK: 235 lit_quoted = 1; 236 /* "$@" syntax adherence hack */ 237 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 238 break; 239 if ((flag & EXP_FULL) != 0) 240 USTPUTC(c, expdest); 241 break; 242 case CTLQUOTEEND: 243 lit_quoted = 0; 244 break; 245 case CTLESC: 246 if (quotes) 247 USTPUTC(c, expdest); 248 c = *p++; 249 USTPUTC(c, expdest); 250 if (split_lit && !lit_quoted) 251 recordregion(expdest - stackblock() - 252 (quotes ? 2 : 1), 253 expdest - stackblock(), 0); 254 break; 255 case CTLVAR: 256 p = evalvar(p, flag); 257 break; 258 case CTLBACKQ: 259 case CTLBACKQ|CTLQUOTE: 260 expbackq(argbackq->n, c & CTLQUOTE, flag); 261 argbackq = argbackq->next; 262 break; 263 case CTLARI: 264 p = expari(p); 265 break; 266 case ':': 267 case '=': 268 /* 269 * sort of a hack - expand tildes in variable 270 * assignments (after the first '=' and after ':'s). 271 */ 272 USTPUTC(c, expdest); 273 if (split_lit && !lit_quoted) 274 recordregion(expdest - stackblock() - 1, 275 expdest - stackblock(), 0); 276 if (flag & EXP_VARTILDE && *p == '~' && 277 (c != '=' || firsteq)) { 278 if (c == '=') 279 firsteq = 0; 280 p = exptilde(p, flag); 281 } 282 break; 283 default: 284 USTPUTC(c, expdest); 285 if (split_lit && !lit_quoted) 286 recordregion(expdest - stackblock() - 1, 287 expdest - stackblock(), 0); 288 } 289 } 290} 291 292/* 293 * Perform tilde expansion, placing the result in the stack string and 294 * returning the next position in the input string to process. 295 */ 296static char * 297exptilde(char *p, int flag) 298{ 299 char c, *startp = p; 300 struct passwd *pw; 301 char *home; 302 303 for (;;) { 304 c = *p; 305 switch(c) { 306 case CTLESC: /* This means CTL* are always considered quoted. */ 307 case CTLVAR: 308 case CTLBACKQ: 309 case CTLBACKQ | CTLQUOTE: 310 case CTLARI: 311 case CTLENDARI: 312 case CTLQUOTEMARK: 313 return (startp); 314 case ':': 315 if ((flag & EXP_VARTILDE) == 0) 316 break; 317 /* FALLTHROUGH */ 318 case '\0': 319 case '/': 320 case CTLENDVAR: 321 *p = '\0'; 322 if (*(startp+1) == '\0') { 323 home = lookupvar("HOME"); 324 } else { 325 pw = getpwnam(startp+1); 326 home = pw != NULL ? pw->pw_dir : NULL; 327 } 328 *p = c; 329 if (home == NULL || *home == '\0') 330 return (startp); 331 strtodest(home, flag, VSNORMAL, 1); 332 return (p); 333 } 334 p++; 335 } 336} 337 338 339static void 340removerecordregions(int endoff) 341{ 342 if (ifslastp == NULL) 343 return; 344 345 if (ifsfirst.endoff > endoff) { 346 while (ifsfirst.next != NULL) { 347 struct ifsregion *ifsp; 348 INTOFF; 349 ifsp = ifsfirst.next->next; 350 ckfree(ifsfirst.next); 351 ifsfirst.next = ifsp; 352 INTON; 353 } 354 if (ifsfirst.begoff > endoff) 355 ifslastp = NULL; 356 else { 357 ifslastp = &ifsfirst; 358 ifsfirst.endoff = endoff; 359 } 360 return; 361 } 362 363 ifslastp = &ifsfirst; 364 while (ifslastp->next && ifslastp->next->begoff < endoff) 365 ifslastp=ifslastp->next; 366 while (ifslastp->next != NULL) { 367 struct ifsregion *ifsp; 368 INTOFF; 369 ifsp = ifslastp->next->next; 370 ckfree(ifslastp->next); 371 ifslastp->next = ifsp; 372 INTON; 373 } 374 if (ifslastp->endoff > endoff) 375 ifslastp->endoff = endoff; 376} 377 378/* 379 * Expand arithmetic expression. 380 * Note that flag is not required as digits never require CTLESC characters. 381 */ 382static char * 383expari(char *p) 384{ 385 char *q, *start; 386 arith_t result; 387 int begoff; 388 int quoted; 389 int adj; 390 391 quoted = *p++ == '"'; 392 begoff = expdest - stackblock(); 393 p = argstr(p, 0); 394 removerecordregions(begoff); 395 STPUTC('\0', expdest); 396 start = stackblock() + begoff; 397 398 q = grabstackstr(expdest); 399 result = arith(start); 400 ungrabstackstr(q, expdest); 401 402 start = stackblock() + begoff; 403 adj = start - expdest; 404 STADJUST(adj, expdest); 405 406 CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest); 407 fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result); 408 adj = strlen(expdest); 409 STADJUST(adj, expdest); 410 if (!quoted) 411 recordregion(begoff, expdest - stackblock(), 0); 412 return p; 413} 414 415 416/* 417 * Perform command substitution. 418 */ 419static void 420expbackq(union node *cmd, int quoted, int flag) 421{ 422 struct backcmd in; 423 int i; 424 char buf[128]; 425 char *p; 426 char *dest = expdest; 427 struct ifsregion saveifs, *savelastp; 428 struct nodelist *saveargbackq; 429 char lastc; 430 int startloc = dest - stackblock(); 431 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 432 int quotes = flag & (EXP_FULL | EXP_CASE); 433 size_t nnl; 434 435 INTOFF; 436 saveifs = ifsfirst; 437 savelastp = ifslastp; 438 saveargbackq = argbackq; 439 p = grabstackstr(dest); 440 evalbackcmd(cmd, &in); 441 ungrabstackstr(p, dest); 442 443 p = in.buf; 444 lastc = '\0'; 445 nnl = 0; 446 /* Don't copy trailing newlines */ 447 for (;;) { 448 if (--in.nleft < 0) { 449 if (in.fd < 0) 450 break; 451 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 452 TRACE(("expbackq: read returns %d\n", i)); 453 if (i <= 0) 454 break; 455 p = buf; 456 in.nleft = i - 1; 457 } 458 lastc = *p++; 459 if (lastc != '\0') { 460 if (lastc == '\n') { 461 nnl++; 462 } else { 463 CHECKSTRSPACE(nnl + 2, dest); 464 while (nnl > 0) { 465 nnl--; 466 USTPUTC('\n', dest); 467 } 468 if (quotes && syntax[(int)lastc] == CCTL) 469 USTPUTC(CTLESC, dest); 470 USTPUTC(lastc, dest); 471 } 472 } 473 } 474 475 if (in.fd >= 0) 476 close(in.fd); 477 if (in.buf) 478 ckfree(in.buf); 479 if (in.jp) { 480 p = grabstackstr(dest); 481 exitstatus = waitforjob(in.jp, (int *)NULL); 482 ungrabstackstr(p, dest); 483 } 484 TRACE(("expbackq: size=%td: \"%.*s\"\n", 485 ((dest - stackblock()) - startloc), 486 (int)((dest - stackblock()) - startloc), 487 stackblock() + startloc)); 488 ifsfirst = saveifs; 489 ifslastp = savelastp; 490 if (quoted == 0) 491 recordregion(startloc, dest - stackblock(), 0); 492 argbackq = saveargbackq; 493 expdest = dest; 494 INTON; 495} 496 497 498 499static void 500recordleft(const char *str, const char *loc, char *startp) 501{ 502 int amount; 503 504 amount = ((str - 1) - (loc - startp)) - expdest; 505 STADJUST(amount, expdest); 506 while (loc != str - 1) 507 *startp++ = *loc++; 508} 509 510static int 511subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 512 int varflags, int quotes) 513{ 514 char *startp; 515 char *loc = NULL; 516 char *q; 517 int c = 0; 518 struct nodelist *saveargbackq = argbackq; 519 int amount; 520 521 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 522 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 523 EXP_CASE : 0) | EXP_TILDE); 524 STACKSTRNUL(expdest); 525 argbackq = saveargbackq; 526 startp = stackblock() + startloc; 527 if (str == NULL) 528 str = stackblock() + strloc; 529 530 switch (subtype) { 531 case VSASSIGN: 532 setvar(str, startp, 0); 533 amount = startp - expdest; 534 STADJUST(amount, expdest); 535 varflags &= ~VSNUL; 536 return 1; 537 538 case VSQUESTION: 539 if (*p != CTLENDVAR) { 540 outfmt(out2, "%s\n", startp); 541 error((char *)NULL); 542 } 543 error("%.*s: parameter %snot set", (int)(p - str - 1), 544 str, (varflags & VSNUL) ? "null or " 545 : nullstr); 546 return 0; 547 548 case VSTRIMLEFT: 549 for (loc = startp; loc < str; loc++) { 550 c = *loc; 551 *loc = '\0'; 552 if (patmatch(str, startp, quotes)) { 553 *loc = c; 554 recordleft(str, loc, startp); 555 return 1; 556 } 557 *loc = c; 558 if (quotes && *loc == CTLESC) 559 loc++; 560 } 561 return 0; 562 563 case VSTRIMLEFTMAX: 564 for (loc = str - 1; loc >= startp;) { 565 c = *loc; 566 *loc = '\0'; 567 if (patmatch(str, startp, quotes)) { 568 *loc = c; 569 recordleft(str, loc, startp); 570 return 1; 571 } 572 *loc = c; 573 loc--; 574 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 575 for (q = startp; q < loc; q++) 576 if (*q == CTLESC) 577 q++; 578 if (q > loc) 579 loc--; 580 } 581 } 582 return 0; 583 584 case VSTRIMRIGHT: 585 for (loc = str - 1; loc >= startp;) { 586 if (patmatch(str, loc, quotes)) { 587 amount = loc - expdest; 588 STADJUST(amount, expdest); 589 return 1; 590 } 591 loc--; 592 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 593 for (q = startp; q < loc; q++) 594 if (*q == CTLESC) 595 q++; 596 if (q > loc) 597 loc--; 598 } 599 } 600 return 0; 601 602 case VSTRIMRIGHTMAX: 603 for (loc = startp; loc < str - 1; loc++) { 604 if (patmatch(str, loc, quotes)) { 605 amount = loc - expdest; 606 STADJUST(amount, expdest); 607 return 1; 608 } 609 if (quotes && *loc == CTLESC) 610 loc++; 611 } 612 return 0; 613 614 615 default: 616 abort(); 617 } 618} 619 620 621/* 622 * Expand a variable, and return a pointer to the next character in the 623 * input string. 624 */ 625 626static char * 627evalvar(char *p, int flag) 628{ 629 int subtype; 630 int varflags; 631 char *var; 632 const char *val; 633 int patloc; 634 int c; 635 int set; 636 int special; 637 int startloc; 638 int varlen; 639 int varlenb; 640 int easy; 641 int quotes = flag & (EXP_FULL | EXP_CASE); 642 int record = 0; 643 644 varflags = (unsigned char)*p++; 645 subtype = varflags & VSTYPE; 646 var = p; 647 special = 0; 648 if (! is_name(*p)) 649 special = 1; 650 p = strchr(p, '=') + 1; 651again: /* jump here after setting a variable with ${var=text} */ 652 if (varflags & VSLINENO) { 653 set = 1; 654 special = 1; 655 val = NULL; 656 } else if (special) { 657 set = varisset(var, varflags & VSNUL); 658 val = NULL; 659 } else { 660 val = bltinlookup(var, 1); 661 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 662 val = NULL; 663 set = 0; 664 } else 665 set = 1; 666 } 667 varlen = 0; 668 startloc = expdest - stackblock(); 669 if (!set && uflag && *var != '@' && *var != '*') { 670 switch (subtype) { 671 case VSNORMAL: 672 case VSTRIMLEFT: 673 case VSTRIMLEFTMAX: 674 case VSTRIMRIGHT: 675 case VSTRIMRIGHTMAX: 676 case VSLENGTH: 677 error("%.*s: parameter not set", (int)(p - var - 1), 678 var); 679 } 680 } 681 if (set && subtype != VSPLUS) { 682 /* insert the value of the variable */ 683 if (special) { 684 if (varflags & VSLINENO) 685 STPUTBIN(var, p - var - 1, expdest); 686 else 687 varvalue(var, varflags & VSQUOTE, subtype, flag); 688 if (subtype == VSLENGTH) { 689 varlenb = expdest - stackblock() - startloc; 690 varlen = varlenb; 691 if (localeisutf8) { 692 val = stackblock() + startloc; 693 for (;val != expdest; val++) 694 if ((*val & 0xC0) == 0x80) 695 varlen--; 696 } 697 STADJUST(-varlenb, expdest); 698 } 699 } else { 700 if (subtype == VSLENGTH) { 701 for (;*val; val++) 702 if (!localeisutf8 || 703 (*val & 0xC0) != 0x80) 704 varlen++; 705 } 706 else 707 strtodest(val, flag, subtype, 708 varflags & VSQUOTE); 709 } 710 } 711 712 if (subtype == VSPLUS) 713 set = ! set; 714 715 easy = ((varflags & VSQUOTE) == 0 || 716 (*var == '@' && shellparam.nparam != 1)); 717 718 719 switch (subtype) { 720 case VSLENGTH: 721 expdest = cvtnum(varlen, expdest); 722 record = 1; 723 break; 724 725 case VSNORMAL: 726 record = easy; 727 break; 728 729 case VSPLUS: 730 case VSMINUS: 731 if (!set) { 732 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 733 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 734 break; 735 } 736 record = easy; 737 break; 738 739 case VSTRIMLEFT: 740 case VSTRIMLEFTMAX: 741 case VSTRIMRIGHT: 742 case VSTRIMRIGHTMAX: 743 if (!set) 744 break; 745 /* 746 * Terminate the string and start recording the pattern 747 * right after it 748 */ 749 STPUTC('\0', expdest); 750 patloc = expdest - stackblock(); 751 if (subevalvar(p, NULL, patloc, subtype, 752 startloc, varflags, quotes) == 0) { 753 int amount = (expdest - stackblock() - patloc) + 1; 754 STADJUST(-amount, expdest); 755 } 756 /* Remove any recorded regions beyond start of variable */ 757 removerecordregions(startloc); 758 record = 1; 759 break; 760 761 case VSASSIGN: 762 case VSQUESTION: 763 if (!set) { 764 if (subevalvar(p, var, 0, subtype, startloc, varflags, 765 quotes)) { 766 varflags &= ~VSNUL; 767 /* 768 * Remove any recorded regions beyond 769 * start of variable 770 */ 771 removerecordregions(startloc); 772 goto again; 773 } 774 break; 775 } 776 record = easy; 777 break; 778 779 case VSERROR: 780 c = p - var - 1; 781 error("${%.*s%s}: Bad substitution", c, var, 782 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 783 784 default: 785 abort(); 786 } 787 788 if (record) 789 recordregion(startloc, expdest - stackblock(), 790 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' && 791 (*var == '@' || *var == '*'))); 792 793 if (subtype != VSNORMAL) { /* skip to end of alternative */ 794 int nesting = 1; 795 for (;;) { 796 if ((c = *p++) == CTLESC) 797 p++; 798 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 799 if (set) 800 argbackq = argbackq->next; 801 } else if (c == CTLVAR) { 802 if ((*p++ & VSTYPE) != VSNORMAL) 803 nesting++; 804 } else if (c == CTLENDVAR) { 805 if (--nesting == 0) 806 break; 807 } 808 } 809 } 810 return p; 811} 812 813 814 815/* 816 * Test whether a specialized variable is set. 817 */ 818 819static int 820varisset(const char *name, int nulok) 821{ 822 823 if (*name == '!') 824 return backgndpidset(); 825 else if (*name == '@' || *name == '*') { 826 if (*shellparam.p == NULL) 827 return 0; 828 829 if (nulok) { 830 char **av; 831 832 for (av = shellparam.p; *av; av++) 833 if (**av != '\0') 834 return 1; 835 return 0; 836 } 837 } else if (is_digit(*name)) { 838 char *ap; 839 long num; 840 841 errno = 0; 842 num = strtol(name, NULL, 10); 843 if (errno != 0 || num > shellparam.nparam) 844 return 0; 845 846 if (num == 0) 847 ap = arg0; 848 else 849 ap = shellparam.p[num - 1]; 850 851 if (nulok && (ap == NULL || *ap == '\0')) 852 return 0; 853 } 854 return 1; 855} 856 857static void 858strtodest(const char *p, int flag, int subtype, int quoted) 859{ 860 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 861 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 862 else 863 STPUTS(p, expdest); 864} 865 866/* 867 * Add the value of a specialized variable to the stack string. 868 */ 869 870static void 871varvalue(const char *name, int quoted, int subtype, int flag) 872{ 873 int num; 874 char *p; 875 int i; 876 char sep; 877 char **ap; 878 879 switch (*name) { 880 case '$': 881 num = rootpid; 882 goto numvar; 883 case '?': 884 num = oexitstatus; 885 goto numvar; 886 case '#': 887 num = shellparam.nparam; 888 goto numvar; 889 case '!': 890 num = backgndpidval(); 891numvar: 892 expdest = cvtnum(num, expdest); 893 break; 894 case '-': 895 for (i = 0 ; i < NOPTS ; i++) { 896 if (optlist[i].val) 897 STPUTC(optlist[i].letter, expdest); 898 } 899 break; 900 case '@': 901 if (flag & EXP_FULL && quoted) { 902 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 903 strtodest(p, flag, subtype, quoted); 904 if (*ap) 905 STPUTC('\0', expdest); 906 } 907 break; 908 } 909 /* FALLTHROUGH */ 910 case '*': 911 if (ifsset()) 912 sep = ifsval()[0]; 913 else 914 sep = ' '; 915 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 916 strtodest(p, flag, subtype, quoted); 917 if (!*ap) 918 break; 919 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 920 STPUTC(sep, expdest); 921 } 922 break; 923 case '0': 924 p = arg0; 925 strtodest(p, flag, subtype, quoted); 926 break; 927 default: 928 if (is_digit(*name)) { 929 num = atoi(name); 930 if (num > 0 && num <= shellparam.nparam) { 931 p = shellparam.p[num - 1]; 932 strtodest(p, flag, subtype, quoted); 933 } 934 } 935 break; 936 } 937} 938 939 940 941/* 942 * Record the fact that we have to scan this region of the 943 * string for IFS characters. 944 */ 945 946static void 947recordregion(int start, int end, int inquotes) 948{ 949 struct ifsregion *ifsp; 950 951 INTOFF; 952 if (ifslastp == NULL) { 953 ifsp = &ifsfirst; 954 } else { 955 if (ifslastp->endoff == start 956 && ifslastp->inquotes == inquotes) { 957 /* extend previous area */ 958 ifslastp->endoff = end; 959 INTON; 960 return; 961 } 962 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 963 ifslastp->next = ifsp; 964 } 965 ifslastp = ifsp; 966 ifslastp->next = NULL; 967 ifslastp->begoff = start; 968 ifslastp->endoff = end; 969 ifslastp->inquotes = inquotes; 970 INTON; 971} 972 973 974 975/* 976 * Break the argument string into pieces based upon IFS and add the 977 * strings to the argument list. The regions of the string to be 978 * searched for IFS characters have been stored by recordregion. 979 * CTLESC characters are preserved but have little effect in this pass 980 * other than escaping CTL* characters. In particular, they do not escape 981 * IFS characters: that should be done with the ifsregion mechanism. 982 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 983 * This pass treats them as a regular character, making the string non-empty. 984 * Later, they are removed along with the other CTL* characters. 985 */ 986static void 987ifsbreakup(char *string, struct arglist *arglist) 988{ 989 struct ifsregion *ifsp; 990 struct strlist *sp; 991 char *start; 992 char *p; 993 char *q; 994 const char *ifs; 995 const char *ifsspc; 996 int had_param_ch = 0; 997 998 start = string; 999 1000 if (ifslastp == NULL) { 1001 /* Return entire argument, IFS doesn't apply to any of it */ 1002 sp = (struct strlist *)stalloc(sizeof *sp); 1003 sp->text = start; 1004 *arglist->lastp = sp; 1005 arglist->lastp = &sp->next; 1006 return; 1007 } 1008 1009 ifs = ifsset() ? ifsval() : " \t\n"; 1010 1011 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1012 p = string + ifsp->begoff; 1013 while (p < string + ifsp->endoff) { 1014 q = p; 1015 if (*p == CTLESC) 1016 p++; 1017 if (ifsp->inquotes) { 1018 /* Only NULs (should be from "$@") end args */ 1019 had_param_ch = 1; 1020 if (*p != 0) { 1021 p++; 1022 continue; 1023 } 1024 ifsspc = NULL; 1025 } else { 1026 if (!strchr(ifs, *p)) { 1027 had_param_ch = 1; 1028 p++; 1029 continue; 1030 } 1031 ifsspc = strchr(" \t\n", *p); 1032 1033 /* Ignore IFS whitespace at start */ 1034 if (q == start && ifsspc != NULL) { 1035 p++; 1036 start = p; 1037 continue; 1038 } 1039 had_param_ch = 0; 1040 } 1041 1042 /* Save this argument... */ 1043 *q = '\0'; 1044 sp = (struct strlist *)stalloc(sizeof *sp); 1045 sp->text = start; 1046 *arglist->lastp = sp; 1047 arglist->lastp = &sp->next; 1048 p++; 1049 1050 if (ifsspc != NULL) { 1051 /* Ignore further trailing IFS whitespace */ 1052 for (; p < string + ifsp->endoff; p++) { 1053 q = p; 1054 if (*p == CTLESC) 1055 p++; 1056 if (strchr(ifs, *p) == NULL) { 1057 p = q; 1058 break; 1059 } 1060 if (strchr(" \t\n", *p) == NULL) { 1061 p++; 1062 break; 1063 } 1064 } 1065 } 1066 start = p; 1067 } 1068 } 1069 1070 /* 1071 * Save anything left as an argument. 1072 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1073 * generating 2 arguments, the second of which is empty. 1074 * Some recent clarification of the Posix spec say that it 1075 * should only generate one.... 1076 */ 1077 if (had_param_ch || *start != 0) { 1078 sp = (struct strlist *)stalloc(sizeof *sp); 1079 sp->text = start; 1080 *arglist->lastp = sp; 1081 arglist->lastp = &sp->next; 1082 } 1083} 1084 1085 1086static char expdir[PATH_MAX]; 1087#define expdir_end (expdir + sizeof(expdir)) 1088 1089/* 1090 * Perform pathname generation and remove control characters. 1091 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1092 * The results are stored in the list exparg. 1093 */ 1094static void 1095expandmeta(struct strlist *str) 1096{ 1097 char *p; 1098 struct strlist **savelastp; 1099 struct strlist *sp; 1100 char c; 1101 1102 while (str) { 1103 if (fflag) 1104 goto nometa; 1105 p = str->text; 1106 for (;;) { /* fast check for meta chars */ 1107 if ((c = *p++) == '\0') 1108 goto nometa; 1109 if (c == '*' || c == '?' || c == '[') 1110 break; 1111 } 1112 savelastp = exparg.lastp; 1113 INTOFF; 1114 expmeta(expdir, str->text); 1115 INTON; 1116 if (exparg.lastp == savelastp) { 1117 /* 1118 * no matches 1119 */ 1120nometa: 1121 *exparg.lastp = str; 1122 rmescapes(str->text); 1123 exparg.lastp = &str->next; 1124 } else { 1125 *exparg.lastp = NULL; 1126 *savelastp = sp = expsort(*savelastp); 1127 while (sp->next != NULL) 1128 sp = sp->next; 1129 exparg.lastp = &sp->next; 1130 } 1131 str = str->next; 1132 } 1133} 1134 1135 1136/* 1137 * Do metacharacter (i.e. *, ?, [...]) expansion. 1138 */ 1139 1140static void 1141expmeta(char *enddir, char *name) 1142{ 1143 const char *p; 1144 const char *q; 1145 const char *start; 1146 char *endname; 1147 int metaflag; 1148 struct stat statb; 1149 DIR *dirp; 1150 struct dirent *dp; 1151 int atend; 1152 int matchdot; 1153 int esc; 1154 int namlen; 1155 1156 metaflag = 0; 1157 start = name; 1158 for (p = name; esc = 0, *p; p += esc + 1) { 1159 if (*p == '*' || *p == '?') 1160 metaflag = 1; 1161 else if (*p == '[') { 1162 q = p + 1; 1163 if (*q == '!' || *q == '^') 1164 q++; 1165 for (;;) { 1166 while (*q == CTLQUOTEMARK) 1167 q++; 1168 if (*q == CTLESC) 1169 q++; 1170 if (*q == '/' || *q == '\0') 1171 break; 1172 if (*++q == ']') { 1173 metaflag = 1; 1174 break; 1175 } 1176 } 1177 } else if (*p == '\0') 1178 break; 1179 else if (*p == CTLQUOTEMARK) 1180 continue; 1181 else { 1182 if (*p == CTLESC) 1183 esc++; 1184 if (p[esc] == '/') { 1185 if (metaflag) 1186 break; 1187 start = p + esc + 1; 1188 } 1189 } 1190 } 1191 if (metaflag == 0) { /* we've reached the end of the file name */ 1192 if (enddir != expdir) 1193 metaflag++; 1194 for (p = name ; ; p++) { 1195 if (*p == CTLQUOTEMARK) 1196 continue; 1197 if (*p == CTLESC) 1198 p++; 1199 *enddir++ = *p; 1200 if (*p == '\0') 1201 break; 1202 if (enddir == expdir_end) 1203 return; 1204 } 1205 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1206 addfname(expdir); 1207 return; 1208 } 1209 endname = name + (p - name); 1210 if (start != name) { 1211 p = name; 1212 while (p < start) { 1213 while (*p == CTLQUOTEMARK) 1214 p++; 1215 if (*p == CTLESC) 1216 p++; 1217 *enddir++ = *p++; 1218 if (enddir == expdir_end) 1219 return; 1220 } 1221 } 1222 if (enddir == expdir) { 1223 p = "."; 1224 } else if (enddir == expdir + 1 && *expdir == '/') { 1225 p = "/"; 1226 } else { 1227 p = expdir; 1228 enddir[-1] = '\0'; 1229 } 1230 if ((dirp = opendir(p)) == NULL) 1231 return; 1232 if (enddir != expdir) 1233 enddir[-1] = '/'; 1234 if (*endname == 0) { 1235 atend = 1; 1236 } else { 1237 atend = 0; 1238 *endname = '\0'; 1239 endname += esc + 1; 1240 } 1241 matchdot = 0; 1242 p = start; 1243 while (*p == CTLQUOTEMARK) 1244 p++; 1245 if (*p == CTLESC) 1246 p++; 1247 if (*p == '.') 1248 matchdot++; 1249 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1250 if (dp->d_name[0] == '.' && ! matchdot) 1251 continue; 1252 if (patmatch(start, dp->d_name, 0)) { 1253 namlen = dp->d_namlen; 1254 if (enddir + namlen + 1 > expdir_end) 1255 continue; 1256 memcpy(enddir, dp->d_name, namlen + 1); 1257 if (atend) 1258 addfname(expdir); 1259 else { 1260 if (dp->d_type != DT_UNKNOWN && 1261 dp->d_type != DT_DIR && 1262 dp->d_type != DT_LNK) 1263 continue; 1264 if (enddir + namlen + 2 > expdir_end) 1265 continue; 1266 enddir[namlen] = '/'; 1267 enddir[namlen + 1] = '\0'; 1268 expmeta(enddir + namlen + 1, endname); 1269 } 1270 } 1271 } 1272 closedir(dirp); 1273 if (! atend) 1274 endname[-esc - 1] = esc ? CTLESC : '/'; 1275} 1276 1277 1278/* 1279 * Add a file name to the list. 1280 */ 1281 1282static void 1283addfname(char *name) 1284{ 1285 char *p; 1286 struct strlist *sp; 1287 1288 p = stsavestr(name); 1289 sp = (struct strlist *)stalloc(sizeof *sp); 1290 sp->text = p; 1291 *exparg.lastp = sp; 1292 exparg.lastp = &sp->next; 1293} 1294 1295 1296/* 1297 * Sort the results of file name expansion. It calculates the number of 1298 * strings to sort and then calls msort (short for merge sort) to do the 1299 * work. 1300 */ 1301 1302static struct strlist * 1303expsort(struct strlist *str) 1304{ 1305 int len; 1306 struct strlist *sp; 1307 1308 len = 0; 1309 for (sp = str ; sp ; sp = sp->next) 1310 len++; 1311 return msort(str, len); 1312} 1313 1314 1315static struct strlist * 1316msort(struct strlist *list, int len) 1317{ 1318 struct strlist *p, *q = NULL; 1319 struct strlist **lpp; 1320 int half; 1321 int n; 1322 1323 if (len <= 1) 1324 return list; 1325 half = len >> 1; 1326 p = list; 1327 for (n = half ; --n >= 0 ; ) { 1328 q = p; 1329 p = p->next; 1330 } 1331 q->next = NULL; /* terminate first half of list */ 1332 q = msort(list, half); /* sort first half of list */ 1333 p = msort(p, len - half); /* sort second half */ 1334 lpp = &list; 1335 for (;;) { 1336 if (strcmp(p->text, q->text) < 0) { 1337 *lpp = p; 1338 lpp = &p->next; 1339 if ((p = *lpp) == NULL) { 1340 *lpp = q; 1341 break; 1342 } 1343 } else { 1344 *lpp = q; 1345 lpp = &q->next; 1346 if ((q = *lpp) == NULL) { 1347 *lpp = p; 1348 break; 1349 } 1350 } 1351 } 1352 return list; 1353} 1354 1355 1356 1357static wchar_t 1358get_wc(const char **p) 1359{ 1360 wchar_t c; 1361 int chrlen; 1362 1363 chrlen = mbtowc(&c, *p, 4); 1364 if (chrlen == 0) 1365 return 0; 1366 else if (chrlen == -1) 1367 c = 0; 1368 else 1369 *p += chrlen; 1370 return c; 1371} 1372 1373 1374/* 1375 * See if a character matches a character class, starting at the first colon 1376 * of "[:class:]". 1377 * If a valid character class is recognized, a pointer to the next character 1378 * after the final closing bracket is stored into *end, otherwise a null 1379 * pointer is stored into *end. 1380 */ 1381static int 1382match_charclass(const char *p, wchar_t chr, const char **end) 1383{ 1384 char name[20]; 1385 const char *nameend; 1386 wctype_t cclass; 1387 1388 *end = NULL; 1389 p++; 1390 nameend = strstr(p, ":]"); 1391 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1392 nameend == p) 1393 return 0; 1394 memcpy(name, p, nameend - p); 1395 name[nameend - p] = '\0'; 1396 *end = nameend + 2; 1397 cclass = wctype(name); 1398 /* An unknown class matches nothing but is valid nevertheless. */ 1399 if (cclass == 0) 1400 return 0; 1401 return iswctype(chr, cclass); 1402} 1403 1404 1405/* 1406 * Returns true if the pattern matches the string. 1407 */ 1408 1409static int 1410patmatch(const char *pattern, const char *string, int squoted) 1411{ 1412 const char *p, *q, *end; 1413 const char *bt_p, *bt_q; 1414 char c; 1415 wchar_t wc, wc2; 1416 1417 p = pattern; 1418 q = string; 1419 bt_p = NULL; 1420 bt_q = NULL; 1421 for (;;) { 1422 switch (c = *p++) { 1423 case '\0': 1424 if (*q != '\0') 1425 goto backtrack; 1426 return 1; 1427 case CTLESC: 1428 if (squoted && *q == CTLESC) 1429 q++; 1430 if (*q++ != *p++) 1431 goto backtrack; 1432 break; 1433 case CTLQUOTEMARK: 1434 continue; 1435 case '?': 1436 if (squoted && *q == CTLESC) 1437 q++; 1438 if (*q == '\0') 1439 return 0; 1440 if (localeisutf8) { 1441 wc = get_wc(&q); 1442 /* 1443 * A '?' does not match invalid UTF-8 but a 1444 * '*' does, so backtrack. 1445 */ 1446 if (wc == 0) 1447 goto backtrack; 1448 } else 1449 wc = (unsigned char)*q++; 1450 break; 1451 case '*': 1452 c = *p; 1453 while (c == CTLQUOTEMARK || c == '*') 1454 c = *++p; 1455 /* 1456 * If the pattern ends here, we know the string 1457 * matches without needing to look at the rest of it. 1458 */ 1459 if (c == '\0') 1460 return 1; 1461 /* 1462 * First try the shortest match for the '*' that 1463 * could work. We can forget any earlier '*' since 1464 * there is no way having it match more characters 1465 * can help us, given that we are already here. 1466 */ 1467 bt_p = p; 1468 bt_q = q; 1469 break; 1470 case '[': { 1471 const char *savep, *saveq; 1472 int invert, found; 1473 wchar_t chr; 1474 1475 savep = p, saveq = q; 1476 invert = 0; 1477 if (*p == '!' || *p == '^') { 1478 invert++; 1479 p++; 1480 } 1481 found = 0; 1482 if (squoted && *q == CTLESC) 1483 q++; 1484 if (*q == '\0') 1485 return 0; 1486 if (localeisutf8) { 1487 chr = get_wc(&q); 1488 if (chr == 0) 1489 goto backtrack; 1490 } else 1491 chr = (unsigned char)*q++; 1492 c = *p++; 1493 do { 1494 if (c == '\0') { 1495 p = savep, q = saveq; 1496 c = '['; 1497 goto dft; 1498 } 1499 if (c == CTLQUOTEMARK) 1500 continue; 1501 if (c == '[' && *p == ':') { 1502 found |= match_charclass(p, chr, &end); 1503 if (end != NULL) 1504 p = end; 1505 } 1506 if (c == CTLESC) 1507 c = *p++; 1508 if (localeisutf8 && c & 0x80) { 1509 p--; 1510 wc = get_wc(&p); 1511 if (wc == 0) /* bad utf-8 */ 1512 return 0; 1513 } else 1514 wc = (unsigned char)c; 1515 if (*p == '-' && p[1] != ']') { 1516 p++; 1517 while (*p == CTLQUOTEMARK) 1518 p++; 1519 if (*p == CTLESC) 1520 p++; 1521 if (localeisutf8) { 1522 wc2 = get_wc(&p); 1523 if (wc2 == 0) /* bad utf-8 */ 1524 return 0; 1525 } else 1526 wc2 = (unsigned char)*p++; 1527 if ( collate_range_cmp(chr, wc) >= 0 1528 && collate_range_cmp(chr, wc2) <= 0 1529 ) 1530 found = 1; 1531 } else { 1532 if (chr == wc) 1533 found = 1; 1534 } 1535 } while ((c = *p++) != ']'); 1536 if (found == invert) 1537 goto backtrack; 1538 break; 1539 } 1540dft: default: 1541 if (squoted && *q == CTLESC) 1542 q++; 1543 if (*q == '\0') 1544 return 0; 1545 if (*q++ == c) 1546 break; 1547backtrack: 1548 /* 1549 * If we have a mismatch (other than hitting the end 1550 * of the string), go back to the last '*' seen and 1551 * have it match one additional character. 1552 */ 1553 if (bt_p == NULL) 1554 return 0; 1555 if (squoted && *bt_q == CTLESC) 1556 bt_q++; 1557 if (*bt_q == '\0') 1558 return 0; 1559 bt_q++; 1560 p = bt_p; 1561 q = bt_q; 1562 break; 1563 } 1564 } 1565} 1566 1567 1568 1569/* 1570 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1571 */ 1572 1573void 1574rmescapes(char *str) 1575{ 1576 char *p, *q; 1577 1578 p = str; 1579 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1580 if (*p++ == '\0') 1581 return; 1582 } 1583 q = p; 1584 while (*p) { 1585 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1586 p++; 1587 continue; 1588 } 1589 if (*p == CTLESC) 1590 p++; 1591 *q++ = *p++; 1592 } 1593 *q = '\0'; 1594} 1595 1596 1597 1598/* 1599 * See if a pattern matches in a case statement. 1600 */ 1601 1602int 1603casematch(union node *pattern, const char *val) 1604{ 1605 struct stackmark smark; 1606 int result; 1607 char *p; 1608 1609 setstackmark(&smark); 1610 argbackq = pattern->narg.backquote; 1611 STARTSTACKSTR(expdest); 1612 ifslastp = NULL; 1613 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1614 STPUTC('\0', expdest); 1615 p = grabstackstr(expdest); 1616 result = patmatch(p, val, 0); 1617 popstackmark(&smark); 1618 return result; 1619} 1620 1621/* 1622 * Our own itoa(). 1623 */ 1624 1625static char * 1626cvtnum(int num, char *buf) 1627{ 1628 char temp[32]; 1629 int neg = num < 0; 1630 char *p = temp + 31; 1631 1632 temp[31] = '\0'; 1633 1634 do { 1635 *--p = num % 10 + '0'; 1636 } while ((num /= 10) != 0); 1637 1638 if (neg) 1639 *--p = '-'; 1640 1641 STPUTS(p, buf); 1642 return buf; 1643} 1644 1645/* 1646 * Do most of the work for wordexp(3). 1647 */ 1648 1649int 1650wordexpcmd(int argc, char **argv) 1651{ 1652 size_t len; 1653 int i; 1654 1655 out1fmt("%08x", argc - 1); 1656 for (i = 1, len = 0; i < argc; i++) 1657 len += strlen(argv[i]); 1658 out1fmt("%08x", (int)len); 1659 for (i = 1; i < argc; i++) 1660 outbin(argv[i], strlen(argv[i]) + 1, out1); 1661 return (0); 1662} 1663 1664/* 1665 * Do most of the work for wordexp(3), new version. 1666 */ 1667 1668int 1669freebsd_wordexpcmd(int argc __unused, char **argv __unused) 1670{ 1671 struct arglist arglist; 1672 union node *args, *n; 1673 struct strlist *sp; 1674 size_t count, len; 1675 int ch; 1676 int protected = 0; 1677 int fd = -1; 1678 1679 while ((ch = nextopt("f:p")) != '\0') { 1680 switch (ch) { 1681 case 'f': 1682 fd = number(shoptarg); 1683 break; 1684 case 'p': 1685 protected = 1; 1686 break; 1687 } 1688 } 1689 if (*argptr != NULL) 1690 error("wrong number of arguments"); 1691 if (fd < 0) 1692 error("missing fd"); 1693 INTOFF; 1694 setinputfd(fd, 1); 1695 INTON; 1696 args = parsewordexp(); 1697 popfile(); /* will also close fd */ 1698 if (protected) 1699 for (n = args; n != NULL; n = n->narg.next) { 1700 if (n->narg.backquote != NULL) { 1701 outcslow('C', out1); 1702 error("command substitution disabled"); 1703 } 1704 } 1705 outcslow(' ', out1); 1706 arglist.lastp = &arglist.list; 1707 for (n = args; n != NULL; n = n->narg.next) 1708 expandarg(n, &arglist, EXP_FULL | EXP_TILDE); 1709 *arglist.lastp = NULL; 1710 for (sp = arglist.list, count = len = 0; sp; sp = sp->next) 1711 count++, len += strlen(sp->text); 1712 out1fmt("%016zx %016zx", count, len); 1713 for (sp = arglist.list; sp; sp = sp->next) 1714 outbin(sp->text, strlen(sp->text) + 1, out1); 1715 return (0); 1716} 1717