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 INTOFF; 960 if (ifslastp == NULL) { 961 ifsp = &ifsfirst; 962 } else { 963 if (ifslastp->endoff == start 964 && ifslastp->inquotes == inquotes) { 965 /* extend previous area */ 966 ifslastp->endoff = end; 967 INTON; 968 return; 969 } 970 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 971 ifslastp->next = ifsp; 972 } 973 ifslastp = ifsp; 974 ifslastp->next = NULL; 975 ifslastp->begoff = start; 976 ifslastp->endoff = end; 977 ifslastp->inquotes = inquotes; 978 INTON; 979 } 980 981 982 983 /* 984 * Break the argument string into pieces based upon IFS and add the 985 * strings to the argument list. The regions of the string to be 986 * searched for IFS characters have been stored by recordregion. 987 * CTLESC characters are preserved but have little effect in this pass 988 * other than escaping CTL* characters. In particular, they do not escape 989 * IFS characters: that should be done with the ifsregion mechanism. 990 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 991 * This pass treats them as a regular character, making the string non-empty. 992 * Later, they are removed along with the other CTL* characters. 993 */ 994 static void 995 ifsbreakup(char *string, struct arglist *arglist) 996 { 997 struct ifsregion *ifsp; 998 struct strlist *sp; 999 char *start; 1000 char *p; 1001 char *q; 1002 const char *ifs; 1003 const char *ifsspc; 1004 int had_param_ch = 0; 1005 1006 start = string; 1007 1008 if (ifslastp == NULL) { 1009 /* Return entire argument, IFS doesn't apply to any of it */ 1010 sp = (struct strlist *)stalloc(sizeof *sp); 1011 sp->text = start; 1012 *arglist->lastp = sp; 1013 arglist->lastp = &sp->next; 1014 return; 1015 } 1016 1017 ifs = ifsset() ? ifsval() : " \t\n"; 1018 1019 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1020 p = string + ifsp->begoff; 1021 while (p < string + ifsp->endoff) { 1022 q = p; 1023 if (*p == CTLESC) 1024 p++; 1025 if (ifsp->inquotes) { 1026 /* Only NULs (should be from "$@") end args */ 1027 had_param_ch = 1; 1028 if (*p != 0) { 1029 p++; 1030 continue; 1031 } 1032 ifsspc = NULL; 1033 } else { 1034 if (!strchr(ifs, *p)) { 1035 had_param_ch = 1; 1036 p++; 1037 continue; 1038 } 1039 ifsspc = strchr(" \t\n", *p); 1040 1041 /* Ignore IFS whitespace at start */ 1042 if (q == start && ifsspc != NULL) { 1043 p++; 1044 start = p; 1045 continue; 1046 } 1047 had_param_ch = 0; 1048 } 1049 1050 /* Save this argument... */ 1051 *q = '\0'; 1052 sp = (struct strlist *)stalloc(sizeof *sp); 1053 sp->text = start; 1054 *arglist->lastp = sp; 1055 arglist->lastp = &sp->next; 1056 p++; 1057 1058 if (ifsspc != NULL) { 1059 /* Ignore further trailing IFS whitespace */ 1060 for (; p < string + ifsp->endoff; p++) { 1061 q = p; 1062 if (*p == CTLESC) 1063 p++; 1064 if (strchr(ifs, *p) == NULL) { 1065 p = q; 1066 break; 1067 } 1068 if (strchr(" \t\n", *p) == NULL) { 1069 p++; 1070 break; 1071 } 1072 } 1073 } 1074 start = p; 1075 } 1076 } 1077 1078 /* 1079 * Save anything left as an argument. 1080 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1081 * generating 2 arguments, the second of which is empty. 1082 * Some recent clarification of the Posix spec say that it 1083 * should only generate one.... 1084 */ 1085 if (had_param_ch || *start != 0) { 1086 sp = (struct strlist *)stalloc(sizeof *sp); 1087 sp->text = start; 1088 *arglist->lastp = sp; 1089 arglist->lastp = &sp->next; 1090 } 1091 } 1092 1093 1094 static char expdir[PATH_MAX]; 1095 #define expdir_end (expdir + sizeof(expdir)) 1096 1097 /* 1098 * Perform pathname generation and remove control characters. 1099 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1100 * The results are stored in the list exparg. 1101 */ 1102 static void 1103 expandmeta(struct strlist *str, int flag __unused) 1104 { 1105 char *p; 1106 struct strlist **savelastp; 1107 struct strlist *sp; 1108 char c; 1109 /* TODO - EXP_REDIR */ 1110 1111 while (str) { 1112 if (fflag) 1113 goto nometa; 1114 p = str->text; 1115 for (;;) { /* fast check for meta chars */ 1116 if ((c = *p++) == '\0') 1117 goto nometa; 1118 if (c == '*' || c == '?' || c == '[') 1119 break; 1120 } 1121 savelastp = exparg.lastp; 1122 INTOFF; 1123 expmeta(expdir, str->text); 1124 INTON; 1125 if (exparg.lastp == savelastp) { 1126 /* 1127 * no matches 1128 */ 1129 nometa: 1130 *exparg.lastp = str; 1131 rmescapes(str->text); 1132 exparg.lastp = &str->next; 1133 } else { 1134 *exparg.lastp = NULL; 1135 *savelastp = sp = expsort(*savelastp); 1136 while (sp->next != NULL) 1137 sp = sp->next; 1138 exparg.lastp = &sp->next; 1139 } 1140 str = str->next; 1141 } 1142 } 1143 1144 1145 /* 1146 * Do metacharacter (i.e. *, ?, [...]) expansion. 1147 */ 1148 1149 static void 1150 expmeta(char *enddir, char *name) 1151 { 1152 const char *p; 1153 const char *q; 1154 const char *start; 1155 char *endname; 1156 int metaflag; 1157 struct stat statb; 1158 DIR *dirp; 1159 struct dirent *dp; 1160 int atend; 1161 int matchdot; 1162 int esc; 1163 int namlen; 1164 1165 metaflag = 0; 1166 start = name; 1167 for (p = name; esc = 0, *p; p += esc + 1) { 1168 if (*p == '*' || *p == '?') 1169 metaflag = 1; 1170 else if (*p == '[') { 1171 q = p + 1; 1172 if (*q == '!' || *q == '^') 1173 q++; 1174 for (;;) { 1175 while (*q == CTLQUOTEMARK) 1176 q++; 1177 if (*q == CTLESC) 1178 q++; 1179 if (*q == '/' || *q == '\0') 1180 break; 1181 if (*++q == ']') { 1182 metaflag = 1; 1183 break; 1184 } 1185 } 1186 } else if (*p == '\0') 1187 break; 1188 else if (*p == CTLQUOTEMARK) 1189 continue; 1190 else { 1191 if (*p == CTLESC) 1192 esc++; 1193 if (p[esc] == '/') { 1194 if (metaflag) 1195 break; 1196 start = p + esc + 1; 1197 } 1198 } 1199 } 1200 if (metaflag == 0) { /* we've reached the end of the file name */ 1201 if (enddir != expdir) 1202 metaflag++; 1203 for (p = name ; ; p++) { 1204 if (*p == CTLQUOTEMARK) 1205 continue; 1206 if (*p == CTLESC) 1207 p++; 1208 *enddir++ = *p; 1209 if (*p == '\0') 1210 break; 1211 if (enddir == expdir_end) 1212 return; 1213 } 1214 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1215 addfname(expdir); 1216 return; 1217 } 1218 endname = name + (p - name); 1219 if (start != name) { 1220 p = name; 1221 while (p < start) { 1222 while (*p == CTLQUOTEMARK) 1223 p++; 1224 if (*p == CTLESC) 1225 p++; 1226 *enddir++ = *p++; 1227 if (enddir == expdir_end) 1228 return; 1229 } 1230 } 1231 if (enddir == expdir) { 1232 p = "."; 1233 } else if (enddir == expdir + 1 && *expdir == '/') { 1234 p = "/"; 1235 } else { 1236 p = expdir; 1237 enddir[-1] = '\0'; 1238 } 1239 if ((dirp = opendir(p)) == NULL) 1240 return; 1241 if (enddir != expdir) 1242 enddir[-1] = '/'; 1243 if (*endname == 0) { 1244 atend = 1; 1245 } else { 1246 atend = 0; 1247 *endname = '\0'; 1248 endname += esc + 1; 1249 } 1250 matchdot = 0; 1251 p = start; 1252 while (*p == CTLQUOTEMARK) 1253 p++; 1254 if (*p == CTLESC) 1255 p++; 1256 if (*p == '.') 1257 matchdot++; 1258 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1259 if (dp->d_name[0] == '.' && ! matchdot) 1260 continue; 1261 if (patmatch(start, dp->d_name, 0)) { 1262 namlen = dp->d_namlen; 1263 if (enddir + namlen + 1 > expdir_end) 1264 continue; 1265 memcpy(enddir, dp->d_name, namlen + 1); 1266 if (atend) 1267 addfname(expdir); 1268 else { 1269 if (dp->d_type != DT_UNKNOWN && 1270 dp->d_type != DT_DIR && 1271 dp->d_type != DT_LNK) 1272 continue; 1273 if (enddir + namlen + 2 > expdir_end) 1274 continue; 1275 enddir[namlen] = '/'; 1276 enddir[namlen + 1] = '\0'; 1277 expmeta(enddir + namlen + 1, endname); 1278 } 1279 } 1280 } 1281 closedir(dirp); 1282 if (! atend) 1283 endname[-esc - 1] = esc ? CTLESC : '/'; 1284 } 1285 1286 1287 /* 1288 * Add a file name to the list. 1289 */ 1290 1291 static void 1292 addfname(char *name) 1293 { 1294 char *p; 1295 struct strlist *sp; 1296 size_t len; 1297 1298 len = strlen(name); 1299 p = stalloc(len + 1); 1300 memcpy(p, name, len + 1); 1301 sp = (struct strlist *)stalloc(sizeof *sp); 1302 sp->text = p; 1303 *exparg.lastp = sp; 1304 exparg.lastp = &sp->next; 1305 } 1306 1307 1308 /* 1309 * Sort the results of file name expansion. It calculates the number of 1310 * strings to sort and then calls msort (short for merge sort) to do the 1311 * work. 1312 */ 1313 1314 static struct strlist * 1315 expsort(struct strlist *str) 1316 { 1317 int len; 1318 struct strlist *sp; 1319 1320 len = 0; 1321 for (sp = str ; sp ; sp = sp->next) 1322 len++; 1323 return msort(str, len); 1324 } 1325 1326 1327 static struct strlist * 1328 msort(struct strlist *list, int len) 1329 { 1330 struct strlist *p, *q = NULL; 1331 struct strlist **lpp; 1332 int half; 1333 int n; 1334 1335 if (len <= 1) 1336 return list; 1337 half = len >> 1; 1338 p = list; 1339 for (n = half ; --n >= 0 ; ) { 1340 q = p; 1341 p = p->next; 1342 } 1343 q->next = NULL; /* terminate first half of list */ 1344 q = msort(list, half); /* sort first half of list */ 1345 p = msort(p, len - half); /* sort second half */ 1346 lpp = &list; 1347 for (;;) { 1348 if (strcmp(p->text, q->text) < 0) { 1349 *lpp = p; 1350 lpp = &p->next; 1351 if ((p = *lpp) == NULL) { 1352 *lpp = q; 1353 break; 1354 } 1355 } else { 1356 *lpp = q; 1357 lpp = &q->next; 1358 if ((q = *lpp) == NULL) { 1359 *lpp = p; 1360 break; 1361 } 1362 } 1363 } 1364 return list; 1365 } 1366 1367 1368 1369 static wchar_t 1370 get_wc(const char **p) 1371 { 1372 wchar_t c; 1373 int chrlen; 1374 1375 chrlen = mbtowc(&c, *p, 4); 1376 if (chrlen == 0) 1377 return 0; 1378 else if (chrlen == -1) 1379 c = 0; 1380 else 1381 *p += chrlen; 1382 return c; 1383 } 1384 1385 1386 /* 1387 * See if a character matches a character class, starting at the first colon 1388 * of "[:class:]". 1389 * If a valid character class is recognized, a pointer to the next character 1390 * after the final closing bracket is stored into *end, otherwise a null 1391 * pointer is stored into *end. 1392 */ 1393 static int 1394 match_charclass(const char *p, wchar_t chr, const char **end) 1395 { 1396 char name[20]; 1397 const char *nameend; 1398 wctype_t cclass; 1399 1400 *end = NULL; 1401 p++; 1402 nameend = strstr(p, ":]"); 1403 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1404 nameend == p) 1405 return 0; 1406 memcpy(name, p, nameend - p); 1407 name[nameend - p] = '\0'; 1408 *end = nameend + 2; 1409 cclass = wctype(name); 1410 /* An unknown class matches nothing but is valid nevertheless. */ 1411 if (cclass == 0) 1412 return 0; 1413 return iswctype(chr, cclass); 1414 } 1415 1416 1417 /* 1418 * Returns true if the pattern matches the string. 1419 */ 1420 1421 static int 1422 patmatch(const char *pattern, const char *string, int squoted) 1423 { 1424 const char *p, *q, *end; 1425 const char *bt_p, *bt_q; 1426 char c; 1427 wchar_t wc, wc2; 1428 1429 p = pattern; 1430 q = string; 1431 bt_p = NULL; 1432 bt_q = NULL; 1433 for (;;) { 1434 switch (c = *p++) { 1435 case '\0': 1436 if (*q != '\0') 1437 goto backtrack; 1438 return 1; 1439 case CTLESC: 1440 if (squoted && *q == CTLESC) 1441 q++; 1442 if (*q++ != *p++) 1443 goto backtrack; 1444 break; 1445 case CTLQUOTEMARK: 1446 continue; 1447 case '?': 1448 if (squoted && *q == CTLESC) 1449 q++; 1450 if (*q == '\0') 1451 return 0; 1452 if (localeisutf8) { 1453 wc = get_wc(&q); 1454 /* 1455 * A '?' does not match invalid UTF-8 but a 1456 * '*' does, so backtrack. 1457 */ 1458 if (wc == 0) 1459 goto backtrack; 1460 } else 1461 wc = (unsigned char)*q++; 1462 break; 1463 case '*': 1464 c = *p; 1465 while (c == CTLQUOTEMARK || c == '*') 1466 c = *++p; 1467 /* 1468 * If the pattern ends here, we know the string 1469 * matches without needing to look at the rest of it. 1470 */ 1471 if (c == '\0') 1472 return 1; 1473 /* 1474 * First try the shortest match for the '*' that 1475 * could work. We can forget any earlier '*' since 1476 * there is no way having it match more characters 1477 * can help us, given that we are already here. 1478 */ 1479 bt_p = p; 1480 bt_q = q; 1481 break; 1482 case '[': { 1483 const char *endp; 1484 int invert, found; 1485 wchar_t chr; 1486 1487 endp = p; 1488 if (*endp == '!' || *endp == '^') 1489 endp++; 1490 for (;;) { 1491 while (*endp == CTLQUOTEMARK) 1492 endp++; 1493 if (*endp == 0) 1494 goto dft; /* no matching ] */ 1495 if (*endp == CTLESC) 1496 endp++; 1497 if (*++endp == ']') 1498 break; 1499 } 1500 invert = 0; 1501 if (*p == '!' || *p == '^') { 1502 invert++; 1503 p++; 1504 } 1505 found = 0; 1506 if (squoted && *q == CTLESC) 1507 q++; 1508 if (*q == '\0') 1509 return 0; 1510 if (localeisutf8) { 1511 chr = get_wc(&q); 1512 if (chr == 0) 1513 goto backtrack; 1514 } else 1515 chr = (unsigned char)*q++; 1516 c = *p++; 1517 do { 1518 if (c == CTLQUOTEMARK) 1519 continue; 1520 if (c == '[' && *p == ':') { 1521 found |= match_charclass(p, chr, &end); 1522 if (end != NULL) 1523 p = end; 1524 } 1525 if (c == CTLESC) 1526 c = *p++; 1527 if (localeisutf8 && c & 0x80) { 1528 p--; 1529 wc = get_wc(&p); 1530 if (wc == 0) /* bad utf-8 */ 1531 return 0; 1532 } else 1533 wc = (unsigned char)c; 1534 if (*p == '-' && p[1] != ']') { 1535 p++; 1536 while (*p == CTLQUOTEMARK) 1537 p++; 1538 if (*p == CTLESC) 1539 p++; 1540 if (localeisutf8) { 1541 wc2 = get_wc(&p); 1542 if (wc2 == 0) /* bad utf-8 */ 1543 return 0; 1544 } else 1545 wc2 = (unsigned char)*p++; 1546 if ( collate_range_cmp(chr, wc) >= 0 1547 && collate_range_cmp(chr, wc2) <= 0 1548 ) 1549 found = 1; 1550 } else { 1551 if (chr == wc) 1552 found = 1; 1553 } 1554 } while ((c = *p++) != ']'); 1555 if (found == invert) 1556 goto backtrack; 1557 break; 1558 } 1559 dft: default: 1560 if (squoted && *q == CTLESC) 1561 q++; 1562 if (*q == '\0') 1563 return 0; 1564 if (*q++ == c) 1565 break; 1566 backtrack: 1567 /* 1568 * If we have a mismatch (other than hitting the end 1569 * of the string), go back to the last '*' seen and 1570 * have it match one additional character. 1571 */ 1572 if (bt_p == NULL) 1573 return 0; 1574 if (squoted && *bt_q == CTLESC) 1575 bt_q++; 1576 if (*bt_q == '\0') 1577 return 0; 1578 bt_q++; 1579 p = bt_p; 1580 q = bt_q; 1581 break; 1582 } 1583 } 1584 } 1585 1586 1587 1588 /* 1589 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1590 */ 1591 1592 void 1593 rmescapes(char *str) 1594 { 1595 char *p, *q; 1596 1597 p = str; 1598 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1599 if (*p++ == '\0') 1600 return; 1601 } 1602 q = p; 1603 while (*p) { 1604 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1605 p++; 1606 continue; 1607 } 1608 if (*p == CTLESC) 1609 p++; 1610 *q++ = *p++; 1611 } 1612 *q = '\0'; 1613 } 1614 1615 1616 1617 /* 1618 * See if a pattern matches in a case statement. 1619 */ 1620 1621 int 1622 casematch(union node *pattern, const char *val) 1623 { 1624 struct stackmark smark; 1625 int result; 1626 char *p; 1627 1628 setstackmark(&smark); 1629 argbackq = pattern->narg.backquote; 1630 STARTSTACKSTR(expdest); 1631 ifslastp = NULL; 1632 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1633 STPUTC('\0', expdest); 1634 p = grabstackstr(expdest); 1635 result = patmatch(p, val, 0); 1636 popstackmark(&smark); 1637 return result; 1638 } 1639 1640 /* 1641 * Our own itoa(). 1642 */ 1643 1644 static char * 1645 cvtnum(int num, char *buf) 1646 { 1647 char temp[32]; 1648 int neg = num < 0; 1649 char *p = temp + 31; 1650 1651 temp[31] = '\0'; 1652 1653 do { 1654 *--p = num % 10 + '0'; 1655 } while ((num /= 10) != 0); 1656 1657 if (neg) 1658 *--p = '-'; 1659 1660 STPUTS(p, buf); 1661 return buf; 1662 } 1663 1664 /* 1665 * Do most of the work for wordexp(3). 1666 */ 1667 1668 int 1669 wordexpcmd(int argc, char **argv) 1670 { 1671 size_t len; 1672 int i; 1673 1674 out1fmt("%08x", argc - 1); 1675 for (i = 1, len = 0; i < argc; i++) 1676 len += strlen(argv[i]); 1677 out1fmt("%08x", (int)len); 1678 for (i = 1; i < argc; i++) 1679 outbin(argv[i], strlen(argv[i]) + 1, out1); 1680 return (0); 1681 } 1682