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