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 if ((home = lookupvar("HOME")) == NULL) 332 goto lose; 333 } else { 334 if ((pw = getpwnam(startp+1)) == NULL) 335 goto lose; 336 home = pw->pw_dir; 337 } 338 if (*home == '\0') 339 goto lose; 340 *p = c; 341 if (quotes) 342 STPUTS_QUOTES(home, SQSYNTAX, expdest); 343 else 344 STPUTS(home, expdest); 345 return (p); 346 lose: 347 *p = c; 348 return (startp); 349 } 350 351 352 static void 353 removerecordregions(int endoff) 354 { 355 if (ifslastp == NULL) 356 return; 357 358 if (ifsfirst.endoff > endoff) { 359 while (ifsfirst.next != NULL) { 360 struct ifsregion *ifsp; 361 INTOFF; 362 ifsp = ifsfirst.next->next; 363 ckfree(ifsfirst.next); 364 ifsfirst.next = ifsp; 365 INTON; 366 } 367 if (ifsfirst.begoff > endoff) 368 ifslastp = NULL; 369 else { 370 ifslastp = &ifsfirst; 371 ifsfirst.endoff = endoff; 372 } 373 return; 374 } 375 376 ifslastp = &ifsfirst; 377 while (ifslastp->next && ifslastp->next->begoff < endoff) 378 ifslastp=ifslastp->next; 379 while (ifslastp->next != NULL) { 380 struct ifsregion *ifsp; 381 INTOFF; 382 ifsp = ifslastp->next->next; 383 ckfree(ifslastp->next); 384 ifslastp->next = ifsp; 385 INTON; 386 } 387 if (ifslastp->endoff > endoff) 388 ifslastp->endoff = endoff; 389 } 390 391 /* 392 * Expand arithmetic expression. 393 * Note that flag is not required as digits never require CTLESC characters. 394 */ 395 static char * 396 expari(char *p) 397 { 398 char *q, *start; 399 arith_t result; 400 int begoff; 401 int quoted; 402 int adj; 403 404 quoted = *p++ == '"'; 405 begoff = expdest - stackblock(); 406 p = argstr(p, 0); 407 removerecordregions(begoff); 408 STPUTC('\0', expdest); 409 start = stackblock() + begoff; 410 411 q = grabstackstr(expdest); 412 result = arith(start); 413 ungrabstackstr(q, expdest); 414 415 start = stackblock() + begoff; 416 adj = start - expdest; 417 STADJUST(adj, expdest); 418 419 CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest); 420 fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result); 421 adj = strlen(expdest); 422 STADJUST(adj, expdest); 423 if (!quoted) 424 recordregion(begoff, expdest - stackblock(), 0); 425 return p; 426 } 427 428 429 /* 430 * Perform command substitution. 431 */ 432 static void 433 expbackq(union node *cmd, int quoted, int flag) 434 { 435 struct backcmd in; 436 int i; 437 char buf[128]; 438 char *p; 439 char *dest = expdest; 440 struct ifsregion saveifs, *savelastp; 441 struct nodelist *saveargbackq; 442 char lastc; 443 int startloc = dest - stackblock(); 444 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 445 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 446 size_t nnl; 447 448 INTOFF; 449 saveifs = ifsfirst; 450 savelastp = ifslastp; 451 saveargbackq = argbackq; 452 p = grabstackstr(dest); 453 evalbackcmd(cmd, &in); 454 ungrabstackstr(p, dest); 455 ifsfirst = saveifs; 456 ifslastp = savelastp; 457 argbackq = saveargbackq; 458 459 p = in.buf; 460 lastc = '\0'; 461 nnl = 0; 462 /* Don't copy trailing newlines */ 463 for (;;) { 464 if (--in.nleft < 0) { 465 if (in.fd < 0) 466 break; 467 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 468 TRACE(("expbackq: read returns %d\n", i)); 469 if (i <= 0) 470 break; 471 p = buf; 472 in.nleft = i - 1; 473 } 474 lastc = *p++; 475 if (lastc != '\0') { 476 if (lastc == '\n') { 477 nnl++; 478 } else { 479 CHECKSTRSPACE(nnl + 2, dest); 480 while (nnl > 0) { 481 nnl--; 482 USTPUTC('\n', dest); 483 } 484 if (quotes && syntax[(int)lastc] == CCTL) 485 USTPUTC(CTLESC, dest); 486 USTPUTC(lastc, dest); 487 } 488 } 489 } 490 491 if (in.fd >= 0) 492 close(in.fd); 493 if (in.buf) 494 ckfree(in.buf); 495 if (in.jp) 496 exitstatus = waitforjob(in.jp, (int *)NULL); 497 if (quoted == 0) 498 recordregion(startloc, dest - stackblock(), 0); 499 TRACE(("expbackq: size=%td: \"%.*s\"\n", 500 ((dest - stackblock()) - startloc), 501 (int)((dest - stackblock()) - startloc), 502 stackblock() + startloc)); 503 expdest = dest; 504 INTON; 505 } 506 507 508 509 static int 510 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 511 int varflags, int quotes) 512 { 513 char *startp; 514 char *loc = NULL; 515 char *q; 516 int c = 0; 517 struct nodelist *saveargbackq = argbackq; 518 int amount; 519 520 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 521 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 522 EXP_CASE : 0) | EXP_TILDE); 523 STACKSTRNUL(expdest); 524 argbackq = saveargbackq; 525 startp = stackblock() + startloc; 526 if (str == NULL) 527 str = stackblock() + strloc; 528 529 switch (subtype) { 530 case VSASSIGN: 531 setvar(str, startp, 0); 532 amount = startp - expdest; 533 STADJUST(amount, expdest); 534 varflags &= ~VSNUL; 535 return 1; 536 537 case VSQUESTION: 538 if (*p != CTLENDVAR) { 539 outfmt(out2, "%s\n", startp); 540 error((char *)NULL); 541 } 542 error("%.*s: parameter %snot set", (int)(p - str - 1), 543 str, (varflags & VSNUL) ? "null or " 544 : nullstr); 545 return 0; 546 547 case VSTRIMLEFT: 548 for (loc = startp; loc < str; loc++) { 549 c = *loc; 550 *loc = '\0'; 551 if (patmatch(str, startp, quotes)) { 552 *loc = c; 553 goto recordleft; 554 } 555 *loc = c; 556 if (quotes && *loc == CTLESC) 557 loc++; 558 } 559 return 0; 560 561 case VSTRIMLEFTMAX: 562 for (loc = str - 1; loc >= startp;) { 563 c = *loc; 564 *loc = '\0'; 565 if (patmatch(str, startp, quotes)) { 566 *loc = c; 567 goto recordleft; 568 } 569 *loc = c; 570 loc--; 571 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 572 for (q = startp; q < loc; q++) 573 if (*q == CTLESC) 574 q++; 575 if (q > loc) 576 loc--; 577 } 578 } 579 return 0; 580 581 case VSTRIMRIGHT: 582 for (loc = str - 1; loc >= startp;) { 583 if (patmatch(str, loc, quotes)) { 584 amount = loc - expdest; 585 STADJUST(amount, expdest); 586 return 1; 587 } 588 loc--; 589 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 590 for (q = startp; q < loc; q++) 591 if (*q == CTLESC) 592 q++; 593 if (q > loc) 594 loc--; 595 } 596 } 597 return 0; 598 599 case VSTRIMRIGHTMAX: 600 for (loc = startp; loc < str - 1; loc++) { 601 if (patmatch(str, loc, quotes)) { 602 amount = loc - expdest; 603 STADJUST(amount, expdest); 604 return 1; 605 } 606 if (quotes && *loc == CTLESC) 607 loc++; 608 } 609 return 0; 610 611 612 default: 613 abort(); 614 } 615 616 recordleft: 617 amount = ((str - 1) - (loc - startp)) - expdest; 618 STADJUST(amount, expdest); 619 while (loc != str - 1) 620 *startp++ = *loc++; 621 return 1; 622 } 623 624 625 /* 626 * Expand a variable, and return a pointer to the next character in the 627 * input string. 628 */ 629 630 static char * 631 evalvar(char *p, int flag) 632 { 633 int subtype; 634 int varflags; 635 char *var; 636 const char *val; 637 int patloc; 638 int c; 639 int set; 640 int special; 641 int startloc; 642 int varlen; 643 int varlenb; 644 int easy; 645 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 646 647 varflags = (unsigned char)*p++; 648 subtype = varflags & VSTYPE; 649 var = p; 650 special = 0; 651 if (! is_name(*p)) 652 special = 1; 653 p = strchr(p, '=') + 1; 654 again: /* jump here after setting a variable with ${var=text} */ 655 if (varflags & VSLINENO) { 656 set = 1; 657 special = 1; 658 val = NULL; 659 } else if (special) { 660 set = varisset(var, varflags & VSNUL); 661 val = NULL; 662 } else { 663 val = bltinlookup(var, 1); 664 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 665 val = NULL; 666 set = 0; 667 } else 668 set = 1; 669 } 670 varlen = 0; 671 startloc = expdest - stackblock(); 672 if (!set && uflag && *var != '@' && *var != '*') { 673 switch (subtype) { 674 case VSNORMAL: 675 case VSTRIMLEFT: 676 case VSTRIMLEFTMAX: 677 case VSTRIMRIGHT: 678 case VSTRIMRIGHTMAX: 679 case VSLENGTH: 680 error("%.*s: parameter not set", (int)(p - var - 1), 681 var); 682 } 683 } 684 if (set && subtype != VSPLUS) { 685 /* insert the value of the variable */ 686 if (special) { 687 if (varflags & VSLINENO) 688 STPUTBIN(var, p - var - 1, expdest); 689 else 690 varvalue(var, varflags & VSQUOTE, subtype, flag); 691 if (subtype == VSLENGTH) { 692 varlenb = expdest - stackblock() - startloc; 693 varlen = varlenb; 694 if (localeisutf8) { 695 val = stackblock() + startloc; 696 for (;val != expdest; val++) 697 if ((*val & 0xC0) == 0x80) 698 varlen--; 699 } 700 STADJUST(-varlenb, expdest); 701 } 702 } else { 703 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 704 : BASESYNTAX; 705 706 if (subtype == VSLENGTH) { 707 for (;*val; val++) 708 if (!localeisutf8 || 709 (*val & 0xC0) != 0x80) 710 varlen++; 711 } 712 else { 713 if (quotes) 714 STPUTS_QUOTES(val, syntax, expdest); 715 else 716 STPUTS(val, expdest); 717 718 } 719 } 720 } 721 722 if (subtype == VSPLUS) 723 set = ! set; 724 725 easy = ((varflags & VSQUOTE) == 0 || 726 (*var == '@' && shellparam.nparam != 1)); 727 728 729 switch (subtype) { 730 case VSLENGTH: 731 expdest = cvtnum(varlen, expdest); 732 goto record; 733 734 case VSNORMAL: 735 if (!easy) 736 break; 737 record: 738 recordregion(startloc, expdest - stackblock(), 739 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' && 740 (*var == '@' || *var == '*'))); 741 break; 742 743 case VSPLUS: 744 case VSMINUS: 745 if (!set) { 746 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 747 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 748 break; 749 } 750 if (easy) 751 goto record; 752 break; 753 754 case VSTRIMLEFT: 755 case VSTRIMLEFTMAX: 756 case VSTRIMRIGHT: 757 case VSTRIMRIGHTMAX: 758 if (!set) 759 break; 760 /* 761 * Terminate the string and start recording the pattern 762 * right after it 763 */ 764 STPUTC('\0', expdest); 765 patloc = expdest - stackblock(); 766 if (subevalvar(p, NULL, patloc, subtype, 767 startloc, varflags, quotes) == 0) { 768 int amount = (expdest - stackblock() - patloc) + 1; 769 STADJUST(-amount, expdest); 770 } 771 /* Remove any recorded regions beyond start of variable */ 772 removerecordregions(startloc); 773 goto record; 774 775 case VSASSIGN: 776 case VSQUESTION: 777 if (!set) { 778 if (subevalvar(p, var, 0, subtype, startloc, varflags, 779 quotes)) { 780 varflags &= ~VSNUL; 781 /* 782 * Remove any recorded regions beyond 783 * start of variable 784 */ 785 removerecordregions(startloc); 786 goto again; 787 } 788 break; 789 } 790 if (easy) 791 goto record; 792 break; 793 794 case VSERROR: 795 c = p - var - 1; 796 error("${%.*s%s}: Bad substitution", c, var, 797 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 798 799 default: 800 abort(); 801 } 802 803 if (subtype != VSNORMAL) { /* skip to end of alternative */ 804 int nesting = 1; 805 for (;;) { 806 if ((c = *p++) == CTLESC) 807 p++; 808 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 809 if (set) 810 argbackq = argbackq->next; 811 } else if (c == CTLVAR) { 812 if ((*p++ & VSTYPE) != VSNORMAL) 813 nesting++; 814 } else if (c == CTLENDVAR) { 815 if (--nesting == 0) 816 break; 817 } 818 } 819 } 820 return p; 821 } 822 823 824 825 /* 826 * Test whether a specialized variable is set. 827 */ 828 829 static int 830 varisset(const char *name, int nulok) 831 { 832 833 if (*name == '!') 834 return backgndpidset(); 835 else if (*name == '@' || *name == '*') { 836 if (*shellparam.p == NULL) 837 return 0; 838 839 if (nulok) { 840 char **av; 841 842 for (av = shellparam.p; *av; av++) 843 if (**av != '\0') 844 return 1; 845 return 0; 846 } 847 } else if (is_digit(*name)) { 848 char *ap; 849 int num = atoi(name); 850 851 if (num > shellparam.nparam) 852 return 0; 853 854 if (num == 0) 855 ap = arg0; 856 else 857 ap = shellparam.p[num - 1]; 858 859 if (nulok && (ap == NULL || *ap == '\0')) 860 return 0; 861 } 862 return 1; 863 } 864 865 static void 866 strtodest(const char *p, int flag, int subtype, int quoted) 867 { 868 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 869 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 870 else 871 STPUTS(p, expdest); 872 } 873 874 /* 875 * Add the value of a specialized variable to the stack string. 876 */ 877 878 static void 879 varvalue(const char *name, int quoted, int subtype, int flag) 880 { 881 int num; 882 char *p; 883 int i; 884 char sep; 885 char **ap; 886 887 switch (*name) { 888 case '$': 889 num = rootpid; 890 goto numvar; 891 case '?': 892 num = oexitstatus; 893 goto numvar; 894 case '#': 895 num = shellparam.nparam; 896 goto numvar; 897 case '!': 898 num = backgndpidval(); 899 numvar: 900 expdest = cvtnum(num, expdest); 901 break; 902 case '-': 903 for (i = 0 ; i < NOPTS ; i++) { 904 if (optlist[i].val) 905 STPUTC(optlist[i].letter, expdest); 906 } 907 break; 908 case '@': 909 if (flag & EXP_FULL && quoted) { 910 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 911 strtodest(p, flag, subtype, quoted); 912 if (*ap) 913 STPUTC('\0', expdest); 914 } 915 break; 916 } 917 /* FALLTHROUGH */ 918 case '*': 919 if (ifsset()) 920 sep = ifsval()[0]; 921 else 922 sep = ' '; 923 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 924 strtodest(p, flag, subtype, quoted); 925 if (!*ap) 926 break; 927 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 928 STPUTC(sep, expdest); 929 } 930 break; 931 case '0': 932 p = arg0; 933 strtodest(p, flag, subtype, quoted); 934 break; 935 default: 936 if (is_digit(*name)) { 937 num = atoi(name); 938 if (num > 0 && num <= shellparam.nparam) { 939 p = shellparam.p[num - 1]; 940 strtodest(p, flag, subtype, quoted); 941 } 942 } 943 break; 944 } 945 } 946 947 948 949 /* 950 * Record the fact that we have to scan this region of the 951 * string for IFS characters. 952 */ 953 954 static void 955 recordregion(int start, int end, int inquotes) 956 { 957 struct ifsregion *ifsp; 958 959 if (ifslastp == NULL) { 960 ifsp = &ifsfirst; 961 } else { 962 if (ifslastp->endoff == start 963 && ifslastp->inquotes == inquotes) { 964 /* extend previous area */ 965 ifslastp->endoff = end; 966 return; 967 } 968 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 969 ifslastp->next = ifsp; 970 } 971 ifslastp = ifsp; 972 ifslastp->next = NULL; 973 ifslastp->begoff = start; 974 ifslastp->endoff = end; 975 ifslastp->inquotes = inquotes; 976 } 977 978 979 980 /* 981 * Break the argument string into pieces based upon IFS and add the 982 * strings to the argument list. The regions of the string to be 983 * searched for IFS characters have been stored by recordregion. 984 * CTLESC characters are preserved but have little effect in this pass 985 * other than escaping CTL* characters. In particular, they do not escape 986 * IFS characters: that should be done with the ifsregion mechanism. 987 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 988 * This pass treats them as a regular character, making the string non-empty. 989 * Later, they are removed along with the other CTL* characters. 990 */ 991 static void 992 ifsbreakup(char *string, struct arglist *arglist) 993 { 994 struct ifsregion *ifsp; 995 struct strlist *sp; 996 char *start; 997 char *p; 998 char *q; 999 const char *ifs; 1000 const char *ifsspc; 1001 int had_param_ch = 0; 1002 1003 start = string; 1004 1005 if (ifslastp == NULL) { 1006 /* Return entire argument, IFS doesn't apply to any of it */ 1007 sp = (struct strlist *)stalloc(sizeof *sp); 1008 sp->text = start; 1009 *arglist->lastp = sp; 1010 arglist->lastp = &sp->next; 1011 return; 1012 } 1013 1014 ifs = ifsset() ? ifsval() : " \t\n"; 1015 1016 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1017 p = string + ifsp->begoff; 1018 while (p < string + ifsp->endoff) { 1019 q = p; 1020 if (*p == CTLESC) 1021 p++; 1022 if (ifsp->inquotes) { 1023 /* Only NULs (should be from "$@") end args */ 1024 had_param_ch = 1; 1025 if (*p != 0) { 1026 p++; 1027 continue; 1028 } 1029 ifsspc = NULL; 1030 } else { 1031 if (!strchr(ifs, *p)) { 1032 had_param_ch = 1; 1033 p++; 1034 continue; 1035 } 1036 ifsspc = strchr(" \t\n", *p); 1037 1038 /* Ignore IFS whitespace at start */ 1039 if (q == start && ifsspc != NULL) { 1040 p++; 1041 start = p; 1042 continue; 1043 } 1044 had_param_ch = 0; 1045 } 1046 1047 /* Save this argument... */ 1048 *q = '\0'; 1049 sp = (struct strlist *)stalloc(sizeof *sp); 1050 sp->text = start; 1051 *arglist->lastp = sp; 1052 arglist->lastp = &sp->next; 1053 p++; 1054 1055 if (ifsspc != NULL) { 1056 /* Ignore further trailing IFS whitespace */ 1057 for (; p < string + ifsp->endoff; p++) { 1058 q = p; 1059 if (*p == CTLESC) 1060 p++; 1061 if (strchr(ifs, *p) == NULL) { 1062 p = q; 1063 break; 1064 } 1065 if (strchr(" \t\n", *p) == NULL) { 1066 p++; 1067 break; 1068 } 1069 } 1070 } 1071 start = p; 1072 } 1073 } 1074 1075 /* 1076 * Save anything left as an argument. 1077 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1078 * generating 2 arguments, the second of which is empty. 1079 * Some recent clarification of the Posix spec say that it 1080 * should only generate one.... 1081 */ 1082 if (had_param_ch || *start != 0) { 1083 sp = (struct strlist *)stalloc(sizeof *sp); 1084 sp->text = start; 1085 *arglist->lastp = sp; 1086 arglist->lastp = &sp->next; 1087 } 1088 } 1089 1090 1091 static char expdir[PATH_MAX]; 1092 #define expdir_end (expdir + sizeof(expdir)) 1093 1094 /* 1095 * Perform pathname generation and remove control characters. 1096 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1097 * The results are stored in the list exparg. 1098 */ 1099 static void 1100 expandmeta(struct strlist *str, int flag __unused) 1101 { 1102 char *p; 1103 struct strlist **savelastp; 1104 struct strlist *sp; 1105 char c; 1106 /* TODO - EXP_REDIR */ 1107 1108 while (str) { 1109 if (fflag) 1110 goto nometa; 1111 p = str->text; 1112 for (;;) { /* fast check for meta chars */ 1113 if ((c = *p++) == '\0') 1114 goto nometa; 1115 if (c == '*' || c == '?' || c == '[') 1116 break; 1117 } 1118 savelastp = exparg.lastp; 1119 INTOFF; 1120 expmeta(expdir, str->text); 1121 INTON; 1122 if (exparg.lastp == savelastp) { 1123 /* 1124 * no matches 1125 */ 1126 nometa: 1127 *exparg.lastp = str; 1128 rmescapes(str->text); 1129 exparg.lastp = &str->next; 1130 } else { 1131 *exparg.lastp = NULL; 1132 *savelastp = sp = expsort(*savelastp); 1133 while (sp->next != NULL) 1134 sp = sp->next; 1135 exparg.lastp = &sp->next; 1136 } 1137 str = str->next; 1138 } 1139 } 1140 1141 1142 /* 1143 * Do metacharacter (i.e. *, ?, [...]) expansion. 1144 */ 1145 1146 static void 1147 expmeta(char *enddir, char *name) 1148 { 1149 const char *p; 1150 const char *q; 1151 const char *start; 1152 char *endname; 1153 int metaflag; 1154 struct stat statb; 1155 DIR *dirp; 1156 struct dirent *dp; 1157 int atend; 1158 int matchdot; 1159 int esc; 1160 int namlen; 1161 1162 metaflag = 0; 1163 start = name; 1164 for (p = name; esc = 0, *p; p += esc + 1) { 1165 if (*p == '*' || *p == '?') 1166 metaflag = 1; 1167 else if (*p == '[') { 1168 q = p + 1; 1169 if (*q == '!' || *q == '^') 1170 q++; 1171 for (;;) { 1172 while (*q == CTLQUOTEMARK) 1173 q++; 1174 if (*q == CTLESC) 1175 q++; 1176 if (*q == '/' || *q == '\0') 1177 break; 1178 if (*++q == ']') { 1179 metaflag = 1; 1180 break; 1181 } 1182 } 1183 } else if (*p == '\0') 1184 break; 1185 else if (*p == CTLQUOTEMARK) 1186 continue; 1187 else { 1188 if (*p == CTLESC) 1189 esc++; 1190 if (p[esc] == '/') { 1191 if (metaflag) 1192 break; 1193 start = p + esc + 1; 1194 } 1195 } 1196 } 1197 if (metaflag == 0) { /* we've reached the end of the file name */ 1198 if (enddir != expdir) 1199 metaflag++; 1200 for (p = name ; ; p++) { 1201 if (*p == CTLQUOTEMARK) 1202 continue; 1203 if (*p == CTLESC) 1204 p++; 1205 *enddir++ = *p; 1206 if (*p == '\0') 1207 break; 1208 if (enddir == expdir_end) 1209 return; 1210 } 1211 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1212 addfname(expdir); 1213 return; 1214 } 1215 endname = name + (p - name); 1216 if (start != name) { 1217 p = name; 1218 while (p < start) { 1219 while (*p == CTLQUOTEMARK) 1220 p++; 1221 if (*p == CTLESC) 1222 p++; 1223 *enddir++ = *p++; 1224 if (enddir == expdir_end) 1225 return; 1226 } 1227 } 1228 if (enddir == expdir) { 1229 p = "."; 1230 } else if (enddir == expdir + 1 && *expdir == '/') { 1231 p = "/"; 1232 } else { 1233 p = expdir; 1234 enddir[-1] = '\0'; 1235 } 1236 if ((dirp = opendir(p)) == NULL) 1237 return; 1238 if (enddir != expdir) 1239 enddir[-1] = '/'; 1240 if (*endname == 0) { 1241 atend = 1; 1242 } else { 1243 atend = 0; 1244 *endname = '\0'; 1245 endname += esc + 1; 1246 } 1247 matchdot = 0; 1248 p = start; 1249 while (*p == CTLQUOTEMARK) 1250 p++; 1251 if (*p == CTLESC) 1252 p++; 1253 if (*p == '.') 1254 matchdot++; 1255 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1256 if (dp->d_name[0] == '.' && ! matchdot) 1257 continue; 1258 if (patmatch(start, dp->d_name, 0)) { 1259 namlen = dp->d_namlen; 1260 if (enddir + namlen + 1 > expdir_end) 1261 continue; 1262 memcpy(enddir, dp->d_name, namlen + 1); 1263 if (atend) 1264 addfname(expdir); 1265 else { 1266 if (dp->d_type != DT_UNKNOWN && 1267 dp->d_type != DT_DIR && 1268 dp->d_type != DT_LNK) 1269 continue; 1270 if (enddir + namlen + 2 > expdir_end) 1271 continue; 1272 enddir[namlen] = '/'; 1273 enddir[namlen + 1] = '\0'; 1274 expmeta(enddir + namlen + 1, endname); 1275 } 1276 } 1277 } 1278 closedir(dirp); 1279 if (! atend) 1280 endname[-esc - 1] = esc ? CTLESC : '/'; 1281 } 1282 1283 1284 /* 1285 * Add a file name to the list. 1286 */ 1287 1288 static void 1289 addfname(char *name) 1290 { 1291 char *p; 1292 struct strlist *sp; 1293 size_t len; 1294 1295 len = strlen(name); 1296 p = stalloc(len + 1); 1297 memcpy(p, name, len + 1); 1298 sp = (struct strlist *)stalloc(sizeof *sp); 1299 sp->text = p; 1300 *exparg.lastp = sp; 1301 exparg.lastp = &sp->next; 1302 } 1303 1304 1305 /* 1306 * Sort the results of file name expansion. It calculates the number of 1307 * strings to sort and then calls msort (short for merge sort) to do the 1308 * work. 1309 */ 1310 1311 static struct strlist * 1312 expsort(struct strlist *str) 1313 { 1314 int len; 1315 struct strlist *sp; 1316 1317 len = 0; 1318 for (sp = str ; sp ; sp = sp->next) 1319 len++; 1320 return msort(str, len); 1321 } 1322 1323 1324 static struct strlist * 1325 msort(struct strlist *list, int len) 1326 { 1327 struct strlist *p, *q = NULL; 1328 struct strlist **lpp; 1329 int half; 1330 int n; 1331 1332 if (len <= 1) 1333 return list; 1334 half = len >> 1; 1335 p = list; 1336 for (n = half ; --n >= 0 ; ) { 1337 q = p; 1338 p = p->next; 1339 } 1340 q->next = NULL; /* terminate first half of list */ 1341 q = msort(list, half); /* sort first half of list */ 1342 p = msort(p, len - half); /* sort second half */ 1343 lpp = &list; 1344 for (;;) { 1345 if (strcmp(p->text, q->text) < 0) { 1346 *lpp = p; 1347 lpp = &p->next; 1348 if ((p = *lpp) == NULL) { 1349 *lpp = q; 1350 break; 1351 } 1352 } else { 1353 *lpp = q; 1354 lpp = &q->next; 1355 if ((q = *lpp) == NULL) { 1356 *lpp = p; 1357 break; 1358 } 1359 } 1360 } 1361 return list; 1362 } 1363 1364 1365 1366 static wchar_t 1367 get_wc(const char **p) 1368 { 1369 wchar_t c; 1370 int chrlen; 1371 1372 chrlen = mbtowc(&c, *p, 4); 1373 if (chrlen == 0) 1374 return 0; 1375 else if (chrlen == -1) 1376 c = 0; 1377 else 1378 *p += chrlen; 1379 return c; 1380 } 1381 1382 1383 /* 1384 * See if a character matches a character class, starting at the first colon 1385 * of "[:class:]". 1386 * If a valid character class is recognized, a pointer to the next character 1387 * after the final closing bracket is stored into *end, otherwise a null 1388 * pointer is stored into *end. 1389 */ 1390 static int 1391 match_charclass(const char *p, wchar_t chr, const char **end) 1392 { 1393 char name[20]; 1394 const char *nameend; 1395 wctype_t cclass; 1396 1397 *end = NULL; 1398 p++; 1399 nameend = strstr(p, ":]"); 1400 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1401 nameend == p) 1402 return 0; 1403 memcpy(name, p, nameend - p); 1404 name[nameend - p] = '\0'; 1405 *end = nameend + 2; 1406 cclass = wctype(name); 1407 /* An unknown class matches nothing but is valid nevertheless. */ 1408 if (cclass == 0) 1409 return 0; 1410 return iswctype(chr, cclass); 1411 } 1412 1413 1414 /* 1415 * Returns true if the pattern matches the string. 1416 */ 1417 1418 static int 1419 patmatch(const char *pattern, const char *string, int squoted) 1420 { 1421 const char *p, *q, *end; 1422 const char *bt_p, *bt_q; 1423 char c; 1424 wchar_t wc, wc2; 1425 1426 p = pattern; 1427 q = string; 1428 bt_p = NULL; 1429 bt_q = NULL; 1430 for (;;) { 1431 switch (c = *p++) { 1432 case '\0': 1433 if (*q != '\0') 1434 goto backtrack; 1435 return 1; 1436 case CTLESC: 1437 if (squoted && *q == CTLESC) 1438 q++; 1439 if (*q++ != *p++) 1440 goto backtrack; 1441 break; 1442 case CTLQUOTEMARK: 1443 continue; 1444 case '?': 1445 if (squoted && *q == CTLESC) 1446 q++; 1447 if (*q == '\0') 1448 return 0; 1449 if (localeisutf8) { 1450 wc = get_wc(&q); 1451 /* 1452 * A '?' does not match invalid UTF-8 but a 1453 * '*' does, so backtrack. 1454 */ 1455 if (wc == 0) 1456 goto backtrack; 1457 } else 1458 wc = (unsigned char)*q++; 1459 break; 1460 case '*': 1461 c = *p; 1462 while (c == CTLQUOTEMARK || c == '*') 1463 c = *++p; 1464 /* 1465 * If the pattern ends here, we know the string 1466 * matches without needing to look at the rest of it. 1467 */ 1468 if (c == '\0') 1469 return 1; 1470 /* 1471 * First try the shortest match for the '*' that 1472 * could work. We can forget any earlier '*' since 1473 * there is no way having it match more characters 1474 * can help us, given that we are already here. 1475 */ 1476 bt_p = p; 1477 bt_q = q; 1478 break; 1479 case '[': { 1480 const char *endp; 1481 int invert, found; 1482 wchar_t chr; 1483 1484 endp = p; 1485 if (*endp == '!' || *endp == '^') 1486 endp++; 1487 for (;;) { 1488 while (*endp == CTLQUOTEMARK) 1489 endp++; 1490 if (*endp == 0) 1491 goto dft; /* no matching ] */ 1492 if (*endp == CTLESC) 1493 endp++; 1494 if (*++endp == ']') 1495 break; 1496 } 1497 invert = 0; 1498 if (*p == '!' || *p == '^') { 1499 invert++; 1500 p++; 1501 } 1502 found = 0; 1503 if (squoted && *q == CTLESC) 1504 q++; 1505 if (*q == '\0') 1506 return 0; 1507 if (localeisutf8) { 1508 chr = get_wc(&q); 1509 if (chr == 0) 1510 goto backtrack; 1511 } else 1512 chr = (unsigned char)*q++; 1513 c = *p++; 1514 do { 1515 if (c == CTLQUOTEMARK) 1516 continue; 1517 if (c == '[' && *p == ':') { 1518 found |= match_charclass(p, chr, &end); 1519 if (end != NULL) 1520 p = end; 1521 } 1522 if (c == CTLESC) 1523 c = *p++; 1524 if (localeisutf8 && c & 0x80) { 1525 p--; 1526 wc = get_wc(&p); 1527 if (wc == 0) /* bad utf-8 */ 1528 return 0; 1529 } else 1530 wc = (unsigned char)c; 1531 if (*p == '-' && p[1] != ']') { 1532 p++; 1533 while (*p == CTLQUOTEMARK) 1534 p++; 1535 if (*p == CTLESC) 1536 p++; 1537 if (localeisutf8) { 1538 wc2 = get_wc(&p); 1539 if (wc2 == 0) /* bad utf-8 */ 1540 return 0; 1541 } else 1542 wc2 = (unsigned char)*p++; 1543 if ( collate_range_cmp(chr, wc) >= 0 1544 && collate_range_cmp(chr, wc2) <= 0 1545 ) 1546 found = 1; 1547 } else { 1548 if (chr == wc) 1549 found = 1; 1550 } 1551 } while ((c = *p++) != ']'); 1552 if (found == invert) 1553 goto backtrack; 1554 break; 1555 } 1556 dft: default: 1557 if (squoted && *q == CTLESC) 1558 q++; 1559 if (*q == '\0') 1560 return 0; 1561 if (*q++ == c) 1562 break; 1563 backtrack: 1564 /* 1565 * If we have a mismatch (other than hitting the end 1566 * of the string), go back to the last '*' seen and 1567 * have it match one additional character. 1568 */ 1569 if (bt_p == NULL) 1570 return 0; 1571 if (squoted && *bt_q == CTLESC) 1572 bt_q++; 1573 if (*bt_q == '\0') 1574 return 0; 1575 bt_q++; 1576 p = bt_p; 1577 q = bt_q; 1578 break; 1579 } 1580 } 1581 } 1582 1583 1584 1585 /* 1586 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1587 */ 1588 1589 void 1590 rmescapes(char *str) 1591 { 1592 char *p, *q; 1593 1594 p = str; 1595 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1596 if (*p++ == '\0') 1597 return; 1598 } 1599 q = p; 1600 while (*p) { 1601 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1602 p++; 1603 continue; 1604 } 1605 if (*p == CTLESC) 1606 p++; 1607 *q++ = *p++; 1608 } 1609 *q = '\0'; 1610 } 1611 1612 1613 1614 /* 1615 * See if a pattern matches in a case statement. 1616 */ 1617 1618 int 1619 casematch(union node *pattern, const char *val) 1620 { 1621 struct stackmark smark; 1622 int result; 1623 char *p; 1624 1625 setstackmark(&smark); 1626 argbackq = pattern->narg.backquote; 1627 STARTSTACKSTR(expdest); 1628 ifslastp = NULL; 1629 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1630 STPUTC('\0', expdest); 1631 p = grabstackstr(expdest); 1632 result = patmatch(p, val, 0); 1633 popstackmark(&smark); 1634 return result; 1635 } 1636 1637 /* 1638 * Our own itoa(). 1639 */ 1640 1641 static char * 1642 cvtnum(int num, char *buf) 1643 { 1644 char temp[32]; 1645 int neg = num < 0; 1646 char *p = temp + 31; 1647 1648 temp[31] = '\0'; 1649 1650 do { 1651 *--p = num % 10 + '0'; 1652 } while ((num /= 10) != 0); 1653 1654 if (neg) 1655 *--p = '-'; 1656 1657 STPUTS(p, buf); 1658 return buf; 1659 } 1660 1661 /* 1662 * Do most of the work for wordexp(3). 1663 */ 1664 1665 int 1666 wordexpcmd(int argc, char **argv) 1667 { 1668 size_t len; 1669 int i; 1670 1671 out1fmt("%08x", argc - 1); 1672 for (i = 1, len = 0; i < argc; i++) 1673 len += strlen(argv[i]); 1674 out1fmt("%08x", (int)len); 1675 for (i = 1; i < argc; i++) 1676 outbin(argv[i], strlen(argv[i]) + 1, out1); 1677 return (0); 1678 } 1679