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 long num; 850 851 errno = 0; 852 num = strtol(name, NULL, 10); 853 if (errno != 0 || num > shellparam.nparam) 854 return 0; 855 856 if (num == 0) 857 ap = arg0; 858 else 859 ap = shellparam.p[num - 1]; 860 861 if (nulok && (ap == NULL || *ap == '\0')) 862 return 0; 863 } 864 return 1; 865 } 866 867 static void 868 strtodest(const char *p, int flag, int subtype, int quoted) 869 { 870 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 871 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 872 else 873 STPUTS(p, expdest); 874 } 875 876 /* 877 * Add the value of a specialized variable to the stack string. 878 */ 879 880 static void 881 varvalue(const char *name, int quoted, int subtype, int flag) 882 { 883 int num; 884 char *p; 885 int i; 886 char sep; 887 char **ap; 888 889 switch (*name) { 890 case '$': 891 num = rootpid; 892 goto numvar; 893 case '?': 894 num = oexitstatus; 895 goto numvar; 896 case '#': 897 num = shellparam.nparam; 898 goto numvar; 899 case '!': 900 num = backgndpidval(); 901 numvar: 902 expdest = cvtnum(num, expdest); 903 break; 904 case '-': 905 for (i = 0 ; i < NOPTS ; i++) { 906 if (optlist[i].val) 907 STPUTC(optlist[i].letter, expdest); 908 } 909 break; 910 case '@': 911 if (flag & EXP_FULL && quoted) { 912 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 913 strtodest(p, flag, subtype, quoted); 914 if (*ap) 915 STPUTC('\0', expdest); 916 } 917 break; 918 } 919 /* FALLTHROUGH */ 920 case '*': 921 if (ifsset()) 922 sep = ifsval()[0]; 923 else 924 sep = ' '; 925 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 926 strtodest(p, flag, subtype, quoted); 927 if (!*ap) 928 break; 929 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 930 STPUTC(sep, expdest); 931 } 932 break; 933 default: 934 if (is_digit(*name)) { 935 num = atoi(name); 936 if (num == 0) 937 p = arg0; 938 else if (num > 0 && num <= shellparam.nparam) 939 p = shellparam.p[num - 1]; 940 else 941 break; 942 strtodest(p, flag, subtype, quoted); 943 } 944 break; 945 } 946 } 947 948 949 950 /* 951 * Record the fact that we have to scan this region of the 952 * string for IFS characters. 953 */ 954 955 static void 956 recordregion(int start, int end, int inquotes) 957 { 958 struct ifsregion *ifsp; 959 960 INTOFF; 961 if (ifslastp == NULL) { 962 ifsp = &ifsfirst; 963 } else { 964 if (ifslastp->endoff == start 965 && ifslastp->inquotes == inquotes) { 966 /* extend previous area */ 967 ifslastp->endoff = end; 968 INTON; 969 return; 970 } 971 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 972 ifslastp->next = ifsp; 973 } 974 ifslastp = ifsp; 975 ifslastp->next = NULL; 976 ifslastp->begoff = start; 977 ifslastp->endoff = end; 978 ifslastp->inquotes = inquotes; 979 INTON; 980 } 981 982 983 984 /* 985 * Break the argument string into pieces based upon IFS and add the 986 * strings to the argument list. The regions of the string to be 987 * searched for IFS characters have been stored by recordregion. 988 * CTLESC characters are preserved but have little effect in this pass 989 * other than escaping CTL* characters. In particular, they do not escape 990 * IFS characters: that should be done with the ifsregion mechanism. 991 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 992 * This pass treats them as a regular character, making the string non-empty. 993 * Later, they are removed along with the other CTL* characters. 994 */ 995 static void 996 ifsbreakup(char *string, struct arglist *arglist) 997 { 998 struct ifsregion *ifsp; 999 struct strlist *sp; 1000 char *start; 1001 char *p; 1002 char *q; 1003 const char *ifs; 1004 const char *ifsspc; 1005 int had_param_ch = 0; 1006 1007 start = string; 1008 1009 if (ifslastp == NULL) { 1010 /* Return entire argument, IFS doesn't apply to any of it */ 1011 sp = (struct strlist *)stalloc(sizeof *sp); 1012 sp->text = start; 1013 *arglist->lastp = sp; 1014 arglist->lastp = &sp->next; 1015 return; 1016 } 1017 1018 ifs = ifsset() ? ifsval() : " \t\n"; 1019 1020 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1021 p = string + ifsp->begoff; 1022 while (p < string + ifsp->endoff) { 1023 q = p; 1024 if (*p == CTLESC) 1025 p++; 1026 if (ifsp->inquotes) { 1027 /* Only NULs (should be from "$@") end args */ 1028 had_param_ch = 1; 1029 if (*p != 0) { 1030 p++; 1031 continue; 1032 } 1033 ifsspc = NULL; 1034 } else { 1035 if (!strchr(ifs, *p)) { 1036 had_param_ch = 1; 1037 p++; 1038 continue; 1039 } 1040 ifsspc = strchr(" \t\n", *p); 1041 1042 /* Ignore IFS whitespace at start */ 1043 if (q == start && ifsspc != NULL) { 1044 p++; 1045 start = p; 1046 continue; 1047 } 1048 had_param_ch = 0; 1049 } 1050 1051 /* Save this argument... */ 1052 *q = '\0'; 1053 sp = (struct strlist *)stalloc(sizeof *sp); 1054 sp->text = start; 1055 *arglist->lastp = sp; 1056 arglist->lastp = &sp->next; 1057 p++; 1058 1059 if (ifsspc != NULL) { 1060 /* Ignore further trailing IFS whitespace */ 1061 for (; p < string + ifsp->endoff; p++) { 1062 q = p; 1063 if (*p == CTLESC) 1064 p++; 1065 if (strchr(ifs, *p) == NULL) { 1066 p = q; 1067 break; 1068 } 1069 if (strchr(" \t\n", *p) == NULL) { 1070 p++; 1071 break; 1072 } 1073 } 1074 } 1075 start = p; 1076 } 1077 } 1078 1079 /* 1080 * Save anything left as an argument. 1081 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1082 * generating 2 arguments, the second of which is empty. 1083 * Some recent clarification of the Posix spec say that it 1084 * should only generate one.... 1085 */ 1086 if (had_param_ch || *start != 0) { 1087 sp = (struct strlist *)stalloc(sizeof *sp); 1088 sp->text = start; 1089 *arglist->lastp = sp; 1090 arglist->lastp = &sp->next; 1091 } 1092 } 1093 1094 1095 static char expdir[PATH_MAX]; 1096 #define expdir_end (expdir + sizeof(expdir)) 1097 1098 /* 1099 * Perform pathname generation and remove control characters. 1100 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1101 * The results are stored in the list exparg. 1102 */ 1103 static void 1104 expandmeta(struct strlist *str, int flag __unused) 1105 { 1106 char *p; 1107 struct strlist **savelastp; 1108 struct strlist *sp; 1109 char c; 1110 /* TODO - EXP_REDIR */ 1111 1112 while (str) { 1113 if (fflag) 1114 goto nometa; 1115 p = str->text; 1116 for (;;) { /* fast check for meta chars */ 1117 if ((c = *p++) == '\0') 1118 goto nometa; 1119 if (c == '*' || c == '?' || c == '[') 1120 break; 1121 } 1122 savelastp = exparg.lastp; 1123 INTOFF; 1124 expmeta(expdir, str->text); 1125 INTON; 1126 if (exparg.lastp == savelastp) { 1127 /* 1128 * no matches 1129 */ 1130 nometa: 1131 *exparg.lastp = str; 1132 rmescapes(str->text); 1133 exparg.lastp = &str->next; 1134 } else { 1135 *exparg.lastp = NULL; 1136 *savelastp = sp = expsort(*savelastp); 1137 while (sp->next != NULL) 1138 sp = sp->next; 1139 exparg.lastp = &sp->next; 1140 } 1141 str = str->next; 1142 } 1143 } 1144 1145 1146 /* 1147 * Do metacharacter (i.e. *, ?, [...]) expansion. 1148 */ 1149 1150 static void 1151 expmeta(char *enddir, char *name) 1152 { 1153 const char *p; 1154 const char *q; 1155 const char *start; 1156 char *endname; 1157 int metaflag; 1158 struct stat statb; 1159 DIR *dirp; 1160 struct dirent *dp; 1161 int atend; 1162 int matchdot; 1163 int esc; 1164 int namlen; 1165 1166 metaflag = 0; 1167 start = name; 1168 for (p = name; esc = 0, *p; p += esc + 1) { 1169 if (*p == '*' || *p == '?') 1170 metaflag = 1; 1171 else if (*p == '[') { 1172 q = p + 1; 1173 if (*q == '!' || *q == '^') 1174 q++; 1175 for (;;) { 1176 while (*q == CTLQUOTEMARK) 1177 q++; 1178 if (*q == CTLESC) 1179 q++; 1180 if (*q == '/' || *q == '\0') 1181 break; 1182 if (*++q == ']') { 1183 metaflag = 1; 1184 break; 1185 } 1186 } 1187 } else if (*p == '\0') 1188 break; 1189 else if (*p == CTLQUOTEMARK) 1190 continue; 1191 else { 1192 if (*p == CTLESC) 1193 esc++; 1194 if (p[esc] == '/') { 1195 if (metaflag) 1196 break; 1197 start = p + esc + 1; 1198 } 1199 } 1200 } 1201 if (metaflag == 0) { /* we've reached the end of the file name */ 1202 if (enddir != expdir) 1203 metaflag++; 1204 for (p = name ; ; p++) { 1205 if (*p == CTLQUOTEMARK) 1206 continue; 1207 if (*p == CTLESC) 1208 p++; 1209 *enddir++ = *p; 1210 if (*p == '\0') 1211 break; 1212 if (enddir == expdir_end) 1213 return; 1214 } 1215 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1216 addfname(expdir); 1217 return; 1218 } 1219 endname = name + (p - name); 1220 if (start != name) { 1221 p = name; 1222 while (p < start) { 1223 while (*p == CTLQUOTEMARK) 1224 p++; 1225 if (*p == CTLESC) 1226 p++; 1227 *enddir++ = *p++; 1228 if (enddir == expdir_end) 1229 return; 1230 } 1231 } 1232 if (enddir == expdir) { 1233 p = "."; 1234 } else if (enddir == expdir + 1 && *expdir == '/') { 1235 p = "/"; 1236 } else { 1237 p = expdir; 1238 enddir[-1] = '\0'; 1239 } 1240 if ((dirp = opendir(p)) == NULL) 1241 return; 1242 if (enddir != expdir) 1243 enddir[-1] = '/'; 1244 if (*endname == 0) { 1245 atend = 1; 1246 } else { 1247 atend = 0; 1248 *endname = '\0'; 1249 endname += esc + 1; 1250 } 1251 matchdot = 0; 1252 p = start; 1253 while (*p == CTLQUOTEMARK) 1254 p++; 1255 if (*p == CTLESC) 1256 p++; 1257 if (*p == '.') 1258 matchdot++; 1259 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1260 if (dp->d_name[0] == '.' && ! matchdot) 1261 continue; 1262 if (patmatch(start, dp->d_name, 0)) { 1263 namlen = dp->d_namlen; 1264 if (enddir + namlen + 1 > expdir_end) 1265 continue; 1266 memcpy(enddir, dp->d_name, namlen + 1); 1267 if (atend) 1268 addfname(expdir); 1269 else { 1270 if (dp->d_type != DT_UNKNOWN && 1271 dp->d_type != DT_DIR && 1272 dp->d_type != DT_LNK) 1273 continue; 1274 if (enddir + namlen + 2 > expdir_end) 1275 continue; 1276 enddir[namlen] = '/'; 1277 enddir[namlen + 1] = '\0'; 1278 expmeta(enddir + namlen + 1, endname); 1279 } 1280 } 1281 } 1282 closedir(dirp); 1283 if (! atend) 1284 endname[-esc - 1] = esc ? CTLESC : '/'; 1285 } 1286 1287 1288 /* 1289 * Add a file name to the list. 1290 */ 1291 1292 static void 1293 addfname(char *name) 1294 { 1295 char *p; 1296 struct strlist *sp; 1297 size_t len; 1298 1299 len = strlen(name); 1300 p = stalloc(len + 1); 1301 memcpy(p, name, len + 1); 1302 sp = (struct strlist *)stalloc(sizeof *sp); 1303 sp->text = p; 1304 *exparg.lastp = sp; 1305 exparg.lastp = &sp->next; 1306 } 1307 1308 1309 /* 1310 * Sort the results of file name expansion. It calculates the number of 1311 * strings to sort and then calls msort (short for merge sort) to do the 1312 * work. 1313 */ 1314 1315 static struct strlist * 1316 expsort(struct strlist *str) 1317 { 1318 int len; 1319 struct strlist *sp; 1320 1321 len = 0; 1322 for (sp = str ; sp ; sp = sp->next) 1323 len++; 1324 return msort(str, len); 1325 } 1326 1327 1328 static struct strlist * 1329 msort(struct strlist *list, int len) 1330 { 1331 struct strlist *p, *q = NULL; 1332 struct strlist **lpp; 1333 int half; 1334 int n; 1335 1336 if (len <= 1) 1337 return list; 1338 half = len >> 1; 1339 p = list; 1340 for (n = half ; --n >= 0 ; ) { 1341 q = p; 1342 p = p->next; 1343 } 1344 q->next = NULL; /* terminate first half of list */ 1345 q = msort(list, half); /* sort first half of list */ 1346 p = msort(p, len - half); /* sort second half */ 1347 lpp = &list; 1348 for (;;) { 1349 if (strcmp(p->text, q->text) < 0) { 1350 *lpp = p; 1351 lpp = &p->next; 1352 if ((p = *lpp) == NULL) { 1353 *lpp = q; 1354 break; 1355 } 1356 } else { 1357 *lpp = q; 1358 lpp = &q->next; 1359 if ((q = *lpp) == NULL) { 1360 *lpp = p; 1361 break; 1362 } 1363 } 1364 } 1365 return list; 1366 } 1367 1368 1369 1370 static wchar_t 1371 get_wc(const char **p) 1372 { 1373 wchar_t c; 1374 int chrlen; 1375 1376 chrlen = mbtowc(&c, *p, 4); 1377 if (chrlen == 0) 1378 return 0; 1379 else if (chrlen == -1) 1380 c = 0; 1381 else 1382 *p += chrlen; 1383 return c; 1384 } 1385 1386 1387 /* 1388 * See if a character matches a character class, starting at the first colon 1389 * of "[:class:]". 1390 * If a valid character class is recognized, a pointer to the next character 1391 * after the final closing bracket is stored into *end, otherwise a null 1392 * pointer is stored into *end. 1393 */ 1394 static int 1395 match_charclass(const char *p, wchar_t chr, const char **end) 1396 { 1397 char name[20]; 1398 const char *nameend; 1399 wctype_t cclass; 1400 1401 *end = NULL; 1402 p++; 1403 nameend = strstr(p, ":]"); 1404 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1405 nameend == p) 1406 return 0; 1407 memcpy(name, p, nameend - p); 1408 name[nameend - p] = '\0'; 1409 *end = nameend + 2; 1410 cclass = wctype(name); 1411 /* An unknown class matches nothing but is valid nevertheless. */ 1412 if (cclass == 0) 1413 return 0; 1414 return iswctype(chr, cclass); 1415 } 1416 1417 1418 /* 1419 * Returns true if the pattern matches the string. 1420 */ 1421 1422 static int 1423 patmatch(const char *pattern, const char *string, int squoted) 1424 { 1425 const char *p, *q, *end; 1426 const char *bt_p, *bt_q; 1427 char c; 1428 wchar_t wc, wc2; 1429 1430 p = pattern; 1431 q = string; 1432 bt_p = NULL; 1433 bt_q = NULL; 1434 for (;;) { 1435 switch (c = *p++) { 1436 case '\0': 1437 if (*q != '\0') 1438 goto backtrack; 1439 return 1; 1440 case CTLESC: 1441 if (squoted && *q == CTLESC) 1442 q++; 1443 if (*q++ != *p++) 1444 goto backtrack; 1445 break; 1446 case CTLQUOTEMARK: 1447 continue; 1448 case '?': 1449 if (squoted && *q == CTLESC) 1450 q++; 1451 if (*q == '\0') 1452 return 0; 1453 if (localeisutf8) { 1454 wc = get_wc(&q); 1455 /* 1456 * A '?' does not match invalid UTF-8 but a 1457 * '*' does, so backtrack. 1458 */ 1459 if (wc == 0) 1460 goto backtrack; 1461 } else 1462 wc = (unsigned char)*q++; 1463 break; 1464 case '*': 1465 c = *p; 1466 while (c == CTLQUOTEMARK || c == '*') 1467 c = *++p; 1468 /* 1469 * If the pattern ends here, we know the string 1470 * matches without needing to look at the rest of it. 1471 */ 1472 if (c == '\0') 1473 return 1; 1474 /* 1475 * First try the shortest match for the '*' that 1476 * could work. We can forget any earlier '*' since 1477 * there is no way having it match more characters 1478 * can help us, given that we are already here. 1479 */ 1480 bt_p = p; 1481 bt_q = q; 1482 break; 1483 case '[': { 1484 const char *endp; 1485 int invert, found; 1486 wchar_t chr; 1487 1488 endp = p; 1489 if (*endp == '!' || *endp == '^') 1490 endp++; 1491 for (;;) { 1492 while (*endp == CTLQUOTEMARK) 1493 endp++; 1494 if (*endp == 0) 1495 goto dft; /* no matching ] */ 1496 if (*endp == CTLESC) 1497 endp++; 1498 if (*++endp == ']') 1499 break; 1500 } 1501 invert = 0; 1502 if (*p == '!' || *p == '^') { 1503 invert++; 1504 p++; 1505 } 1506 found = 0; 1507 if (squoted && *q == CTLESC) 1508 q++; 1509 if (*q == '\0') 1510 return 0; 1511 if (localeisutf8) { 1512 chr = get_wc(&q); 1513 if (chr == 0) 1514 goto backtrack; 1515 } else 1516 chr = (unsigned char)*q++; 1517 c = *p++; 1518 do { 1519 if (c == CTLQUOTEMARK) 1520 continue; 1521 if (c == '[' && *p == ':') { 1522 found |= match_charclass(p, chr, &end); 1523 if (end != NULL) 1524 p = end; 1525 } 1526 if (c == CTLESC) 1527 c = *p++; 1528 if (localeisutf8 && c & 0x80) { 1529 p--; 1530 wc = get_wc(&p); 1531 if (wc == 0) /* bad utf-8 */ 1532 return 0; 1533 } else 1534 wc = (unsigned char)c; 1535 if (*p == '-' && p[1] != ']') { 1536 p++; 1537 while (*p == CTLQUOTEMARK) 1538 p++; 1539 if (*p == CTLESC) 1540 p++; 1541 if (localeisutf8) { 1542 wc2 = get_wc(&p); 1543 if (wc2 == 0) /* bad utf-8 */ 1544 return 0; 1545 } else 1546 wc2 = (unsigned char)*p++; 1547 if ( collate_range_cmp(chr, wc) >= 0 1548 && collate_range_cmp(chr, wc2) <= 0 1549 ) 1550 found = 1; 1551 } else { 1552 if (chr == wc) 1553 found = 1; 1554 } 1555 } while ((c = *p++) != ']'); 1556 if (found == invert) 1557 goto backtrack; 1558 break; 1559 } 1560 dft: default: 1561 if (squoted && *q == CTLESC) 1562 q++; 1563 if (*q == '\0') 1564 return 0; 1565 if (*q++ == c) 1566 break; 1567 backtrack: 1568 /* 1569 * If we have a mismatch (other than hitting the end 1570 * of the string), go back to the last '*' seen and 1571 * have it match one additional character. 1572 */ 1573 if (bt_p == NULL) 1574 return 0; 1575 if (squoted && *bt_q == CTLESC) 1576 bt_q++; 1577 if (*bt_q == '\0') 1578 return 0; 1579 bt_q++; 1580 p = bt_p; 1581 q = bt_q; 1582 break; 1583 } 1584 } 1585 } 1586 1587 1588 1589 /* 1590 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1591 */ 1592 1593 void 1594 rmescapes(char *str) 1595 { 1596 char *p, *q; 1597 1598 p = str; 1599 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1600 if (*p++ == '\0') 1601 return; 1602 } 1603 q = p; 1604 while (*p) { 1605 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1606 p++; 1607 continue; 1608 } 1609 if (*p == CTLESC) 1610 p++; 1611 *q++ = *p++; 1612 } 1613 *q = '\0'; 1614 } 1615 1616 1617 1618 /* 1619 * See if a pattern matches in a case statement. 1620 */ 1621 1622 int 1623 casematch(union node *pattern, const char *val) 1624 { 1625 struct stackmark smark; 1626 int result; 1627 char *p; 1628 1629 setstackmark(&smark); 1630 argbackq = pattern->narg.backquote; 1631 STARTSTACKSTR(expdest); 1632 ifslastp = NULL; 1633 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1634 STPUTC('\0', expdest); 1635 p = grabstackstr(expdest); 1636 result = patmatch(p, val, 0); 1637 popstackmark(&smark); 1638 return result; 1639 } 1640 1641 /* 1642 * Our own itoa(). 1643 */ 1644 1645 static char * 1646 cvtnum(int num, char *buf) 1647 { 1648 char temp[32]; 1649 int neg = num < 0; 1650 char *p = temp + 31; 1651 1652 temp[31] = '\0'; 1653 1654 do { 1655 *--p = num % 10 + '0'; 1656 } while ((num /= 10) != 0); 1657 1658 if (neg) 1659 *--p = '-'; 1660 1661 STPUTS(p, buf); 1662 return buf; 1663 } 1664 1665 /* 1666 * Do most of the work for wordexp(3). 1667 */ 1668 1669 int 1670 wordexpcmd(int argc, char **argv) 1671 { 1672 size_t len; 1673 int i; 1674 1675 out1fmt("%08x", argc - 1); 1676 for (i = 1, len = 0; i < argc; i++) 1677 len += strlen(argv[i]); 1678 out1fmt("%08x", (int)len); 1679 for (i = 1; i < argc; i++) 1680 outbin(argv[i], strlen(argv[i]) + 1, out1); 1681 return (0); 1682 } 1683