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 goto numvar; 888 case '?': 889 num = oexitstatus; 890 goto numvar; 891 case '#': 892 num = shellparam.nparam; 893 goto numvar; 894 case '!': 895 num = backgndpidval(); 896 numvar: 897 expdest = cvtnum(num, expdest); 898 break; 899 case '-': 900 for (i = 0 ; i < NOPTS ; i++) { 901 if (optlist[i].val) 902 STPUTC(optlist[i].letter, expdest); 903 } 904 break; 905 case '@': 906 if (flag & EXP_FULL && quoted) { 907 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 908 strtodest(p, flag, subtype, quoted); 909 if (*ap) 910 STPUTC('\0', expdest); 911 } 912 break; 913 } 914 /* FALLTHROUGH */ 915 case '*': 916 if (ifsset()) 917 sep = ifsval()[0]; 918 else 919 sep = ' '; 920 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 921 strtodest(p, flag, subtype, quoted); 922 if (!*ap) 923 break; 924 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 925 STPUTC(sep, expdest); 926 } 927 break; 928 default: 929 if (is_digit(*name)) { 930 num = atoi(name); 931 if (num == 0) 932 p = arg0; 933 else if (num > 0 && num <= shellparam.nparam) 934 p = shellparam.p[num - 1]; 935 else 936 break; 937 strtodest(p, flag, subtype, quoted); 938 } 939 break; 940 } 941 } 942 943 944 945 /* 946 * Record the fact that we have to scan this region of the 947 * string for IFS characters. 948 */ 949 950 static void 951 recordregion(int start, int end, int inquotes) 952 { 953 struct ifsregion *ifsp; 954 955 INTOFF; 956 if (ifslastp == NULL) { 957 ifsp = &ifsfirst; 958 } else { 959 if (ifslastp->endoff == start 960 && ifslastp->inquotes == inquotes) { 961 /* extend previous area */ 962 ifslastp->endoff = end; 963 INTON; 964 return; 965 } 966 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 967 ifslastp->next = ifsp; 968 } 969 ifslastp = ifsp; 970 ifslastp->next = NULL; 971 ifslastp->begoff = start; 972 ifslastp->endoff = end; 973 ifslastp->inquotes = inquotes; 974 INTON; 975 } 976 977 978 979 /* 980 * Break the argument string into pieces based upon IFS and add the 981 * strings to the argument list. The regions of the string to be 982 * searched for IFS characters have been stored by recordregion. 983 * CTLESC characters are preserved but have little effect in this pass 984 * other than escaping CTL* characters. In particular, they do not escape 985 * IFS characters: that should be done with the ifsregion mechanism. 986 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 987 * This pass treats them as a regular character, making the string non-empty. 988 * Later, they are removed along with the other CTL* characters. 989 */ 990 static void 991 ifsbreakup(char *string, struct arglist *arglist) 992 { 993 struct ifsregion *ifsp; 994 struct strlist *sp; 995 char *start; 996 char *p; 997 char *q; 998 const char *ifs; 999 const char *ifsspc; 1000 int had_param_ch = 0; 1001 1002 start = string; 1003 1004 if (ifslastp == NULL) { 1005 /* Return entire argument, IFS doesn't apply to any of it */ 1006 sp = (struct strlist *)stalloc(sizeof *sp); 1007 sp->text = start; 1008 *arglist->lastp = sp; 1009 arglist->lastp = &sp->next; 1010 return; 1011 } 1012 1013 ifs = ifsset() ? ifsval() : " \t\n"; 1014 1015 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1016 p = string + ifsp->begoff; 1017 while (p < string + ifsp->endoff) { 1018 q = p; 1019 if (*p == CTLESC) 1020 p++; 1021 if (ifsp->inquotes) { 1022 /* Only NULs (should be from "$@") end args */ 1023 had_param_ch = 1; 1024 if (*p != 0) { 1025 p++; 1026 continue; 1027 } 1028 ifsspc = NULL; 1029 } else { 1030 if (!strchr(ifs, *p)) { 1031 had_param_ch = 1; 1032 p++; 1033 continue; 1034 } 1035 ifsspc = strchr(" \t\n", *p); 1036 1037 /* Ignore IFS whitespace at start */ 1038 if (q == start && ifsspc != NULL) { 1039 p++; 1040 start = p; 1041 continue; 1042 } 1043 had_param_ch = 0; 1044 } 1045 1046 /* Save this argument... */ 1047 *q = '\0'; 1048 sp = (struct strlist *)stalloc(sizeof *sp); 1049 sp->text = start; 1050 *arglist->lastp = sp; 1051 arglist->lastp = &sp->next; 1052 p++; 1053 1054 if (ifsspc != NULL) { 1055 /* Ignore further trailing IFS whitespace */ 1056 for (; p < string + ifsp->endoff; p++) { 1057 q = p; 1058 if (*p == CTLESC) 1059 p++; 1060 if (strchr(ifs, *p) == NULL) { 1061 p = q; 1062 break; 1063 } 1064 if (strchr(" \t\n", *p) == NULL) { 1065 p++; 1066 break; 1067 } 1068 } 1069 } 1070 start = p; 1071 } 1072 } 1073 1074 /* 1075 * Save anything left as an argument. 1076 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1077 * generating 2 arguments, the second of which is empty. 1078 * Some recent clarification of the Posix spec say that it 1079 * should only generate one.... 1080 */ 1081 if (had_param_ch || *start != 0) { 1082 sp = (struct strlist *)stalloc(sizeof *sp); 1083 sp->text = start; 1084 *arglist->lastp = sp; 1085 arglist->lastp = &sp->next; 1086 } 1087 } 1088 1089 1090 static char expdir[PATH_MAX]; 1091 #define expdir_end (expdir + sizeof(expdir)) 1092 1093 /* 1094 * Perform pathname generation and remove control characters. 1095 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1096 * The results are stored in the list exparg. 1097 */ 1098 static void 1099 expandmeta(struct strlist *str, int flag __unused) 1100 { 1101 char *p; 1102 struct strlist **savelastp; 1103 struct strlist *sp; 1104 char c; 1105 /* TODO - EXP_REDIR */ 1106 1107 while (str) { 1108 if (fflag) 1109 goto nometa; 1110 p = str->text; 1111 for (;;) { /* fast check for meta chars */ 1112 if ((c = *p++) == '\0') 1113 goto nometa; 1114 if (c == '*' || c == '?' || c == '[') 1115 break; 1116 } 1117 savelastp = exparg.lastp; 1118 INTOFF; 1119 expmeta(expdir, str->text); 1120 INTON; 1121 if (exparg.lastp == savelastp) { 1122 /* 1123 * no matches 1124 */ 1125 nometa: 1126 *exparg.lastp = str; 1127 rmescapes(str->text); 1128 exparg.lastp = &str->next; 1129 } else { 1130 *exparg.lastp = NULL; 1131 *savelastp = sp = expsort(*savelastp); 1132 while (sp->next != NULL) 1133 sp = sp->next; 1134 exparg.lastp = &sp->next; 1135 } 1136 str = str->next; 1137 } 1138 } 1139 1140 1141 /* 1142 * Do metacharacter (i.e. *, ?, [...]) expansion. 1143 */ 1144 1145 static void 1146 expmeta(char *enddir, char *name) 1147 { 1148 const char *p; 1149 const char *q; 1150 const char *start; 1151 char *endname; 1152 int metaflag; 1153 struct stat statb; 1154 DIR *dirp; 1155 struct dirent *dp; 1156 int atend; 1157 int matchdot; 1158 int esc; 1159 int namlen; 1160 1161 metaflag = 0; 1162 start = name; 1163 for (p = name; esc = 0, *p; p += esc + 1) { 1164 if (*p == '*' || *p == '?') 1165 metaflag = 1; 1166 else if (*p == '[') { 1167 q = p + 1; 1168 if (*q == '!' || *q == '^') 1169 q++; 1170 for (;;) { 1171 while (*q == CTLQUOTEMARK) 1172 q++; 1173 if (*q == CTLESC) 1174 q++; 1175 if (*q == '/' || *q == '\0') 1176 break; 1177 if (*++q == ']') { 1178 metaflag = 1; 1179 break; 1180 } 1181 } 1182 } else if (*p == '\0') 1183 break; 1184 else if (*p == CTLQUOTEMARK) 1185 continue; 1186 else { 1187 if (*p == CTLESC) 1188 esc++; 1189 if (p[esc] == '/') { 1190 if (metaflag) 1191 break; 1192 start = p + esc + 1; 1193 } 1194 } 1195 } 1196 if (metaflag == 0) { /* we've reached the end of the file name */ 1197 if (enddir != expdir) 1198 metaflag++; 1199 for (p = name ; ; p++) { 1200 if (*p == CTLQUOTEMARK) 1201 continue; 1202 if (*p == CTLESC) 1203 p++; 1204 *enddir++ = *p; 1205 if (*p == '\0') 1206 break; 1207 if (enddir == expdir_end) 1208 return; 1209 } 1210 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1211 addfname(expdir); 1212 return; 1213 } 1214 endname = name + (p - name); 1215 if (start != name) { 1216 p = name; 1217 while (p < start) { 1218 while (*p == CTLQUOTEMARK) 1219 p++; 1220 if (*p == CTLESC) 1221 p++; 1222 *enddir++ = *p++; 1223 if (enddir == expdir_end) 1224 return; 1225 } 1226 } 1227 if (enddir == expdir) { 1228 p = "."; 1229 } else if (enddir == expdir + 1 && *expdir == '/') { 1230 p = "/"; 1231 } else { 1232 p = expdir; 1233 enddir[-1] = '\0'; 1234 } 1235 if ((dirp = opendir(p)) == NULL) 1236 return; 1237 if (enddir != expdir) 1238 enddir[-1] = '/'; 1239 if (*endname == 0) { 1240 atend = 1; 1241 } else { 1242 atend = 0; 1243 *endname = '\0'; 1244 endname += esc + 1; 1245 } 1246 matchdot = 0; 1247 p = start; 1248 while (*p == CTLQUOTEMARK) 1249 p++; 1250 if (*p == CTLESC) 1251 p++; 1252 if (*p == '.') 1253 matchdot++; 1254 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1255 if (dp->d_name[0] == '.' && ! matchdot) 1256 continue; 1257 if (patmatch(start, dp->d_name, 0)) { 1258 namlen = dp->d_namlen; 1259 if (enddir + namlen + 1 > expdir_end) 1260 continue; 1261 memcpy(enddir, dp->d_name, namlen + 1); 1262 if (atend) 1263 addfname(expdir); 1264 else { 1265 if (dp->d_type != DT_UNKNOWN && 1266 dp->d_type != DT_DIR && 1267 dp->d_type != DT_LNK) 1268 continue; 1269 if (enddir + namlen + 2 > expdir_end) 1270 continue; 1271 enddir[namlen] = '/'; 1272 enddir[namlen + 1] = '\0'; 1273 expmeta(enddir + namlen + 1, endname); 1274 } 1275 } 1276 } 1277 closedir(dirp); 1278 if (! atend) 1279 endname[-esc - 1] = esc ? CTLESC : '/'; 1280 } 1281 1282 1283 /* 1284 * Add a file name to the list. 1285 */ 1286 1287 static void 1288 addfname(char *name) 1289 { 1290 char *p; 1291 struct strlist *sp; 1292 size_t len; 1293 1294 len = strlen(name); 1295 p = stalloc(len + 1); 1296 memcpy(p, name, len + 1); 1297 sp = (struct strlist *)stalloc(sizeof *sp); 1298 sp->text = p; 1299 *exparg.lastp = sp; 1300 exparg.lastp = &sp->next; 1301 } 1302 1303 1304 /* 1305 * Sort the results of file name expansion. It calculates the number of 1306 * strings to sort and then calls msort (short for merge sort) to do the 1307 * work. 1308 */ 1309 1310 static struct strlist * 1311 expsort(struct strlist *str) 1312 { 1313 int len; 1314 struct strlist *sp; 1315 1316 len = 0; 1317 for (sp = str ; sp ; sp = sp->next) 1318 len++; 1319 return msort(str, len); 1320 } 1321 1322 1323 static struct strlist * 1324 msort(struct strlist *list, int len) 1325 { 1326 struct strlist *p, *q = NULL; 1327 struct strlist **lpp; 1328 int half; 1329 int n; 1330 1331 if (len <= 1) 1332 return list; 1333 half = len >> 1; 1334 p = list; 1335 for (n = half ; --n >= 0 ; ) { 1336 q = p; 1337 p = p->next; 1338 } 1339 q->next = NULL; /* terminate first half of list */ 1340 q = msort(list, half); /* sort first half of list */ 1341 p = msort(p, len - half); /* sort second half */ 1342 lpp = &list; 1343 for (;;) { 1344 if (strcmp(p->text, q->text) < 0) { 1345 *lpp = p; 1346 lpp = &p->next; 1347 if ((p = *lpp) == NULL) { 1348 *lpp = q; 1349 break; 1350 } 1351 } else { 1352 *lpp = q; 1353 lpp = &q->next; 1354 if ((q = *lpp) == NULL) { 1355 *lpp = p; 1356 break; 1357 } 1358 } 1359 } 1360 return list; 1361 } 1362 1363 1364 1365 static wchar_t 1366 get_wc(const char **p) 1367 { 1368 wchar_t c; 1369 int chrlen; 1370 1371 chrlen = mbtowc(&c, *p, 4); 1372 if (chrlen == 0) 1373 return 0; 1374 else if (chrlen == -1) 1375 c = 0; 1376 else 1377 *p += chrlen; 1378 return c; 1379 } 1380 1381 1382 /* 1383 * See if a character matches a character class, starting at the first colon 1384 * of "[:class:]". 1385 * If a valid character class is recognized, a pointer to the next character 1386 * after the final closing bracket is stored into *end, otherwise a null 1387 * pointer is stored into *end. 1388 */ 1389 static int 1390 match_charclass(const char *p, wchar_t chr, const char **end) 1391 { 1392 char name[20]; 1393 const char *nameend; 1394 wctype_t cclass; 1395 1396 *end = NULL; 1397 p++; 1398 nameend = strstr(p, ":]"); 1399 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1400 nameend == p) 1401 return 0; 1402 memcpy(name, p, nameend - p); 1403 name[nameend - p] = '\0'; 1404 *end = nameend + 2; 1405 cclass = wctype(name); 1406 /* An unknown class matches nothing but is valid nevertheless. */ 1407 if (cclass == 0) 1408 return 0; 1409 return iswctype(chr, cclass); 1410 } 1411 1412 1413 /* 1414 * Returns true if the pattern matches the string. 1415 */ 1416 1417 static int 1418 patmatch(const char *pattern, const char *string, int squoted) 1419 { 1420 const char *p, *q, *end; 1421 const char *bt_p, *bt_q; 1422 char c; 1423 wchar_t wc, wc2; 1424 1425 p = pattern; 1426 q = string; 1427 bt_p = NULL; 1428 bt_q = NULL; 1429 for (;;) { 1430 switch (c = *p++) { 1431 case '\0': 1432 if (*q != '\0') 1433 goto backtrack; 1434 return 1; 1435 case CTLESC: 1436 if (squoted && *q == CTLESC) 1437 q++; 1438 if (*q++ != *p++) 1439 goto backtrack; 1440 break; 1441 case CTLQUOTEMARK: 1442 continue; 1443 case '?': 1444 if (squoted && *q == CTLESC) 1445 q++; 1446 if (*q == '\0') 1447 return 0; 1448 if (localeisutf8) { 1449 wc = get_wc(&q); 1450 /* 1451 * A '?' does not match invalid UTF-8 but a 1452 * '*' does, so backtrack. 1453 */ 1454 if (wc == 0) 1455 goto backtrack; 1456 } else 1457 wc = (unsigned char)*q++; 1458 break; 1459 case '*': 1460 c = *p; 1461 while (c == CTLQUOTEMARK || c == '*') 1462 c = *++p; 1463 /* 1464 * If the pattern ends here, we know the string 1465 * matches without needing to look at the rest of it. 1466 */ 1467 if (c == '\0') 1468 return 1; 1469 /* 1470 * First try the shortest match for the '*' that 1471 * could work. We can forget any earlier '*' since 1472 * there is no way having it match more characters 1473 * can help us, given that we are already here. 1474 */ 1475 bt_p = p; 1476 bt_q = q; 1477 break; 1478 case '[': { 1479 const char *endp; 1480 int invert, found; 1481 wchar_t chr; 1482 1483 endp = p; 1484 if (*endp == '!' || *endp == '^') 1485 endp++; 1486 for (;;) { 1487 while (*endp == CTLQUOTEMARK) 1488 endp++; 1489 if (*endp == 0) 1490 goto dft; /* no matching ] */ 1491 if (*endp == CTLESC) 1492 endp++; 1493 if (*++endp == ']') 1494 break; 1495 } 1496 invert = 0; 1497 if (*p == '!' || *p == '^') { 1498 invert++; 1499 p++; 1500 } 1501 found = 0; 1502 if (squoted && *q == CTLESC) 1503 q++; 1504 if (*q == '\0') 1505 return 0; 1506 if (localeisutf8) { 1507 chr = get_wc(&q); 1508 if (chr == 0) 1509 goto backtrack; 1510 } else 1511 chr = (unsigned char)*q++; 1512 c = *p++; 1513 do { 1514 if (c == CTLQUOTEMARK) 1515 continue; 1516 if (c == '[' && *p == ':') { 1517 found |= match_charclass(p, chr, &end); 1518 if (end != NULL) 1519 p = end; 1520 } 1521 if (c == CTLESC) 1522 c = *p++; 1523 if (localeisutf8 && c & 0x80) { 1524 p--; 1525 wc = get_wc(&p); 1526 if (wc == 0) /* bad utf-8 */ 1527 return 0; 1528 } else 1529 wc = (unsigned char)c; 1530 if (*p == '-' && p[1] != ']') { 1531 p++; 1532 while (*p == CTLQUOTEMARK) 1533 p++; 1534 if (*p == CTLESC) 1535 p++; 1536 if (localeisutf8) { 1537 wc2 = get_wc(&p); 1538 if (wc2 == 0) /* bad utf-8 */ 1539 return 0; 1540 } else 1541 wc2 = (unsigned char)*p++; 1542 if ( collate_range_cmp(chr, wc) >= 0 1543 && collate_range_cmp(chr, wc2) <= 0 1544 ) 1545 found = 1; 1546 } else { 1547 if (chr == wc) 1548 found = 1; 1549 } 1550 } while ((c = *p++) != ']'); 1551 if (found == invert) 1552 goto backtrack; 1553 break; 1554 } 1555 dft: default: 1556 if (squoted && *q == CTLESC) 1557 q++; 1558 if (*q == '\0') 1559 return 0; 1560 if (*q++ == c) 1561 break; 1562 backtrack: 1563 /* 1564 * If we have a mismatch (other than hitting the end 1565 * of the string), go back to the last '*' seen and 1566 * have it match one additional character. 1567 */ 1568 if (bt_p == NULL) 1569 return 0; 1570 if (squoted && *bt_q == CTLESC) 1571 bt_q++; 1572 if (*bt_q == '\0') 1573 return 0; 1574 bt_q++; 1575 p = bt_p; 1576 q = bt_q; 1577 break; 1578 } 1579 } 1580 } 1581 1582 1583 1584 /* 1585 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1586 */ 1587 1588 void 1589 rmescapes(char *str) 1590 { 1591 char *p, *q; 1592 1593 p = str; 1594 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1595 if (*p++ == '\0') 1596 return; 1597 } 1598 q = p; 1599 while (*p) { 1600 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1601 p++; 1602 continue; 1603 } 1604 if (*p == CTLESC) 1605 p++; 1606 *q++ = *p++; 1607 } 1608 *q = '\0'; 1609 } 1610 1611 1612 1613 /* 1614 * See if a pattern matches in a case statement. 1615 */ 1616 1617 int 1618 casematch(union node *pattern, const char *val) 1619 { 1620 struct stackmark smark; 1621 int result; 1622 char *p; 1623 1624 setstackmark(&smark); 1625 argbackq = pattern->narg.backquote; 1626 STARTSTACKSTR(expdest); 1627 ifslastp = NULL; 1628 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1629 STPUTC('\0', expdest); 1630 p = grabstackstr(expdest); 1631 result = patmatch(p, val, 0); 1632 popstackmark(&smark); 1633 return result; 1634 } 1635 1636 /* 1637 * Our own itoa(). 1638 */ 1639 1640 static char * 1641 cvtnum(int num, char *buf) 1642 { 1643 char temp[32]; 1644 int neg = num < 0; 1645 char *p = temp + 31; 1646 1647 temp[31] = '\0'; 1648 1649 do { 1650 *--p = num % 10 + '0'; 1651 } while ((num /= 10) != 0); 1652 1653 if (neg) 1654 *--p = '-'; 1655 1656 STPUTS(p, buf); 1657 return buf; 1658 } 1659 1660 /* 1661 * Do most of the work for wordexp(3). 1662 */ 1663 1664 int 1665 wordexpcmd(int argc, char **argv) 1666 { 1667 size_t len; 1668 int i; 1669 1670 out1fmt("%08x", argc - 1); 1671 for (i = 1, len = 0; i < argc; i++) 1672 len += strlen(argv[i]); 1673 out1fmt("%08x", (int)len); 1674 for (i = 1; i < argc; i++) 1675 outbin(argv[i], strlen(argv[i]) + 1, out1); 1676 return (0); 1677 } 1678