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 void argstr(char *, int); 102 static char *exptilde(char *, int); 103 static void expari(int); 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(char *, int); 108 static void varvalue(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 character as well as '\0'. 211 * This is used to expand word in ${var+word} etc. 212 * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC 213 * characters to allow for further processing. 214 * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 215 */ 216 static void 217 argstr(char *p, int flag) 218 { 219 char c; 220 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 221 int firsteq = 1; 222 int split_lit; 223 int lit_quoted; 224 225 split_lit = flag & EXP_SPLIT_LIT; 226 lit_quoted = flag & EXP_LIT_QUOTED; 227 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 228 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 229 p = exptilde(p, flag); 230 for (;;) { 231 CHECKSTRSPACE(2, expdest); 232 switch (c = *p++) { 233 case '\0': 234 case CTLENDVAR: 235 goto breakloop; 236 case CTLQUOTEMARK: 237 lit_quoted = 1; 238 /* "$@" syntax adherence hack */ 239 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 240 break; 241 if ((flag & EXP_FULL) != 0) 242 USTPUTC(c, expdest); 243 break; 244 case CTLQUOTEEND: 245 lit_quoted = 0; 246 break; 247 case CTLESC: 248 if (quotes) 249 USTPUTC(c, expdest); 250 c = *p++; 251 USTPUTC(c, expdest); 252 if (split_lit && !lit_quoted) 253 recordregion(expdest - stackblock() - 254 (quotes ? 2 : 1), 255 expdest - stackblock(), 0); 256 break; 257 case CTLVAR: 258 p = evalvar(p, flag); 259 break; 260 case CTLBACKQ: 261 case CTLBACKQ|CTLQUOTE: 262 expbackq(argbackq->n, c & CTLQUOTE, flag); 263 argbackq = argbackq->next; 264 break; 265 case CTLENDARI: 266 expari(flag); 267 break; 268 case ':': 269 case '=': 270 /* 271 * sort of a hack - expand tildes in variable 272 * assignments (after the first '=' and after ':'s). 273 */ 274 USTPUTC(c, expdest); 275 if (split_lit && !lit_quoted) 276 recordregion(expdest - stackblock() - 1, 277 expdest - stackblock(), 0); 278 if (flag & EXP_VARTILDE && *p == '~' && 279 (c != '=' || firsteq)) { 280 if (c == '=') 281 firsteq = 0; 282 p = exptilde(p, flag); 283 } 284 break; 285 default: 286 USTPUTC(c, expdest); 287 if (split_lit && !lit_quoted) 288 recordregion(expdest - stackblock() - 1, 289 expdest - stackblock(), 0); 290 } 291 } 292 breakloop:; 293 } 294 295 /* 296 * Perform tilde expansion, placing the result in the stack string and 297 * returning the next position in the input string to process. 298 */ 299 static char * 300 exptilde(char *p, int flag) 301 { 302 char c, *startp = p; 303 struct passwd *pw; 304 char *home; 305 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 306 307 while ((c = *p) != '\0') { 308 switch(c) { 309 case CTLESC: /* This means CTL* are always considered quoted. */ 310 case CTLVAR: 311 case CTLBACKQ: 312 case CTLBACKQ | CTLQUOTE: 313 case CTLARI: 314 case CTLENDARI: 315 case CTLQUOTEMARK: 316 return (startp); 317 case ':': 318 if (flag & EXP_VARTILDE) 319 goto done; 320 break; 321 case '/': 322 case CTLENDVAR: 323 goto done; 324 } 325 p++; 326 } 327 done: 328 *p = '\0'; 329 if (*(startp+1) == '\0') { 330 if ((home = lookupvar("HOME")) == NULL) 331 goto lose; 332 } else { 333 if ((pw = getpwnam(startp+1)) == NULL) 334 goto lose; 335 home = pw->pw_dir; 336 } 337 if (*home == '\0') 338 goto lose; 339 *p = c; 340 if (quotes) 341 STPUTS_QUOTES(home, SQSYNTAX, expdest); 342 else 343 STPUTS(home, expdest); 344 return (p); 345 lose: 346 *p = c; 347 return (startp); 348 } 349 350 351 static void 352 removerecordregions(int endoff) 353 { 354 if (ifslastp == NULL) 355 return; 356 357 if (ifsfirst.endoff > endoff) { 358 while (ifsfirst.next != NULL) { 359 struct ifsregion *ifsp; 360 INTOFF; 361 ifsp = ifsfirst.next->next; 362 ckfree(ifsfirst.next); 363 ifsfirst.next = ifsp; 364 INTON; 365 } 366 if (ifsfirst.begoff > endoff) 367 ifslastp = NULL; 368 else { 369 ifslastp = &ifsfirst; 370 ifsfirst.endoff = endoff; 371 } 372 return; 373 } 374 375 ifslastp = &ifsfirst; 376 while (ifslastp->next && ifslastp->next->begoff < endoff) 377 ifslastp=ifslastp->next; 378 while (ifslastp->next != NULL) { 379 struct ifsregion *ifsp; 380 INTOFF; 381 ifsp = ifslastp->next->next; 382 ckfree(ifslastp->next); 383 ifslastp->next = ifsp; 384 INTON; 385 } 386 if (ifslastp->endoff > endoff) 387 ifslastp->endoff = endoff; 388 } 389 390 /* 391 * Expand arithmetic expression. Backup to start of expression, 392 * evaluate, place result in (backed up) result, adjust string position. 393 */ 394 static void 395 expari(int flag) 396 { 397 char *p, *q, *start; 398 arith_t result; 399 int begoff; 400 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 401 int quoted; 402 403 /* 404 * This routine is slightly over-complicated for 405 * efficiency. First we make sure there is 406 * enough space for the result, which may be bigger 407 * than the expression. Next we 408 * scan backwards looking for the start of arithmetic. If the 409 * next previous character is a CTLESC character, then we 410 * have to rescan starting from the beginning since CTLESC 411 * characters have to be processed left to right. 412 */ 413 CHECKSTRSPACE(DIGITS(result) - 2, expdest); 414 USTPUTC('\0', expdest); 415 start = stackblock(); 416 p = expdest - 2; 417 while (p >= start && *p != CTLARI) 418 --p; 419 if (p < start || *p != CTLARI) 420 error("missing CTLARI (shouldn't happen)"); 421 if (p > start && *(p - 1) == CTLESC) 422 for (p = start; *p != CTLARI; p++) 423 if (*p == CTLESC) 424 p++; 425 426 if (p[1] == '"') 427 quoted=1; 428 else 429 quoted=0; 430 begoff = p - start; 431 removerecordregions(begoff); 432 if (quotes) 433 rmescapes(p+2); 434 q = grabstackstr(expdest); 435 result = arith(p+2); 436 ungrabstackstr(q, expdest); 437 fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 438 while (*p++) 439 ; 440 if (quoted == 0) 441 recordregion(begoff, p - 1 - start, 0); 442 result = expdest - p + 1; 443 STADJUST(-result, expdest); 444 } 445 446 447 /* 448 * Perform command substitution. 449 */ 450 static void 451 expbackq(union node *cmd, int quoted, int flag) 452 { 453 struct backcmd in; 454 int i; 455 char buf[128]; 456 char *p; 457 char *dest = expdest; 458 struct ifsregion saveifs, *savelastp; 459 struct nodelist *saveargbackq; 460 char lastc; 461 int startloc = dest - stackblock(); 462 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 463 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 464 size_t nnl; 465 466 INTOFF; 467 saveifs = ifsfirst; 468 savelastp = ifslastp; 469 saveargbackq = argbackq; 470 p = grabstackstr(dest); 471 evalbackcmd(cmd, &in); 472 ungrabstackstr(p, dest); 473 ifsfirst = saveifs; 474 ifslastp = savelastp; 475 argbackq = saveargbackq; 476 477 p = in.buf; 478 lastc = '\0'; 479 nnl = 0; 480 /* Don't copy trailing newlines */ 481 for (;;) { 482 if (--in.nleft < 0) { 483 if (in.fd < 0) 484 break; 485 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 486 TRACE(("expbackq: read returns %d\n", i)); 487 if (i <= 0) 488 break; 489 p = buf; 490 in.nleft = i - 1; 491 } 492 lastc = *p++; 493 if (lastc != '\0') { 494 if (lastc == '\n') { 495 nnl++; 496 } else { 497 CHECKSTRSPACE(nnl + 2, dest); 498 while (nnl > 0) { 499 nnl--; 500 USTPUTC('\n', dest); 501 } 502 if (quotes && syntax[(int)lastc] == CCTL) 503 USTPUTC(CTLESC, dest); 504 USTPUTC(lastc, dest); 505 } 506 } 507 } 508 509 if (in.fd >= 0) 510 close(in.fd); 511 if (in.buf) 512 ckfree(in.buf); 513 if (in.jp) 514 exitstatus = waitforjob(in.jp, (int *)NULL); 515 if (quoted == 0) 516 recordregion(startloc, dest - stackblock(), 0); 517 TRACE(("expbackq: size=%td: \"%.*s\"\n", 518 ((dest - stackblock()) - startloc), 519 (int)((dest - stackblock()) - startloc), 520 stackblock() + startloc)); 521 expdest = dest; 522 INTON; 523 } 524 525 526 527 static int 528 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 529 int varflags, int quotes) 530 { 531 char *startp; 532 char *loc = NULL; 533 char *q; 534 int c = 0; 535 struct nodelist *saveargbackq = argbackq; 536 int amount; 537 538 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 539 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 540 EXP_CASE : 0) | EXP_TILDE); 541 STACKSTRNUL(expdest); 542 argbackq = saveargbackq; 543 startp = stackblock() + startloc; 544 if (str == NULL) 545 str = stackblock() + strloc; 546 547 switch (subtype) { 548 case VSASSIGN: 549 setvar(str, startp, 0); 550 amount = startp - expdest; 551 STADJUST(amount, expdest); 552 varflags &= ~VSNUL; 553 return 1; 554 555 case VSQUESTION: 556 if (*p != CTLENDVAR) { 557 outfmt(out2, "%s\n", startp); 558 error((char *)NULL); 559 } 560 error("%.*s: parameter %snot set", (int)(p - str - 1), 561 str, (varflags & VSNUL) ? "null or " 562 : nullstr); 563 return 0; 564 565 case VSTRIMLEFT: 566 for (loc = startp; loc < str; loc++) { 567 c = *loc; 568 *loc = '\0'; 569 if (patmatch(str, startp, quotes)) { 570 *loc = c; 571 goto recordleft; 572 } 573 *loc = c; 574 if (quotes && *loc == CTLESC) 575 loc++; 576 } 577 return 0; 578 579 case VSTRIMLEFTMAX: 580 for (loc = str - 1; loc >= startp;) { 581 c = *loc; 582 *loc = '\0'; 583 if (patmatch(str, startp, quotes)) { 584 *loc = c; 585 goto recordleft; 586 } 587 *loc = c; 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 VSTRIMRIGHT: 600 for (loc = str - 1; loc >= startp;) { 601 if (patmatch(str, loc, quotes)) { 602 amount = loc - expdest; 603 STADJUST(amount, expdest); 604 return 1; 605 } 606 loc--; 607 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 608 for (q = startp; q < loc; q++) 609 if (*q == CTLESC) 610 q++; 611 if (q > loc) 612 loc--; 613 } 614 } 615 return 0; 616 617 case VSTRIMRIGHTMAX: 618 for (loc = startp; loc < str - 1; loc++) { 619 if (patmatch(str, loc, quotes)) { 620 amount = loc - expdest; 621 STADJUST(amount, expdest); 622 return 1; 623 } 624 if (quotes && *loc == CTLESC) 625 loc++; 626 } 627 return 0; 628 629 630 default: 631 abort(); 632 } 633 634 recordleft: 635 amount = ((str - 1) - (loc - startp)) - expdest; 636 STADJUST(amount, expdest); 637 while (loc != str - 1) 638 *startp++ = *loc++; 639 return 1; 640 } 641 642 643 /* 644 * Expand a variable, and return a pointer to the next character in the 645 * input string. 646 */ 647 648 static char * 649 evalvar(char *p, int flag) 650 { 651 int subtype; 652 int varflags; 653 char *var; 654 char *val; 655 int patloc; 656 int c; 657 int set; 658 int special; 659 int startloc; 660 int varlen; 661 int varlenb; 662 int easy; 663 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 664 665 varflags = (unsigned char)*p++; 666 subtype = varflags & VSTYPE; 667 var = p; 668 special = 0; 669 if (! is_name(*p)) 670 special = 1; 671 p = strchr(p, '=') + 1; 672 again: /* jump here after setting a variable with ${var=text} */ 673 if (varflags & VSLINENO) { 674 set = 1; 675 special = 0; 676 val = var; 677 p[-1] = '\0'; /* temporarily overwrite '=' to have \0 678 terminated string */ 679 } else if (special) { 680 set = varisset(var, varflags & VSNUL); 681 val = NULL; 682 } else { 683 val = bltinlookup(var, 1); 684 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 685 val = NULL; 686 set = 0; 687 } else 688 set = 1; 689 } 690 varlen = 0; 691 startloc = expdest - stackblock(); 692 if (!set && uflag && *var != '@' && *var != '*') { 693 switch (subtype) { 694 case VSNORMAL: 695 case VSTRIMLEFT: 696 case VSTRIMLEFTMAX: 697 case VSTRIMRIGHT: 698 case VSTRIMRIGHTMAX: 699 case VSLENGTH: 700 error("%.*s: parameter not set", (int)(p - var - 1), 701 var); 702 } 703 } 704 if (set && subtype != VSPLUS) { 705 /* insert the value of the variable */ 706 if (special) { 707 varvalue(var, varflags & VSQUOTE, subtype, flag); 708 if (subtype == VSLENGTH) { 709 varlenb = expdest - stackblock() - startloc; 710 varlen = varlenb; 711 if (localeisutf8) { 712 val = stackblock() + startloc; 713 for (;val != expdest; val++) 714 if ((*val & 0xC0) == 0x80) 715 varlen--; 716 } 717 STADJUST(-varlenb, expdest); 718 } 719 } else { 720 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 721 : BASESYNTAX; 722 723 if (subtype == VSLENGTH) { 724 for (;*val; val++) 725 if (!localeisutf8 || 726 (*val & 0xC0) != 0x80) 727 varlen++; 728 } 729 else { 730 if (quotes) 731 STPUTS_QUOTES(val, syntax, expdest); 732 else 733 STPUTS(val, expdest); 734 735 } 736 } 737 } 738 739 if (subtype == VSPLUS) 740 set = ! set; 741 742 easy = ((varflags & VSQUOTE) == 0 || 743 (*var == '@' && shellparam.nparam != 1)); 744 745 746 switch (subtype) { 747 case VSLENGTH: 748 expdest = cvtnum(varlen, expdest); 749 goto record; 750 751 case VSNORMAL: 752 if (!easy) 753 break; 754 record: 755 recordregion(startloc, expdest - stackblock(), 756 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' && 757 (*var == '@' || *var == '*'))); 758 break; 759 760 case VSPLUS: 761 case VSMINUS: 762 if (!set) { 763 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 764 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 765 break; 766 } 767 if (easy) 768 goto record; 769 break; 770 771 case VSTRIMLEFT: 772 case VSTRIMLEFTMAX: 773 case VSTRIMRIGHT: 774 case VSTRIMRIGHTMAX: 775 if (!set) 776 break; 777 /* 778 * Terminate the string and start recording the pattern 779 * right after it 780 */ 781 STPUTC('\0', expdest); 782 patloc = expdest - stackblock(); 783 if (subevalvar(p, NULL, patloc, subtype, 784 startloc, varflags, quotes) == 0) { 785 int amount = (expdest - stackblock() - patloc) + 1; 786 STADJUST(-amount, expdest); 787 } 788 /* Remove any recorded regions beyond start of variable */ 789 removerecordregions(startloc); 790 goto record; 791 792 case VSASSIGN: 793 case VSQUESTION: 794 if (!set) { 795 if (subevalvar(p, var, 0, subtype, startloc, varflags, 796 quotes)) { 797 varflags &= ~VSNUL; 798 /* 799 * Remove any recorded regions beyond 800 * start of variable 801 */ 802 removerecordregions(startloc); 803 goto again; 804 } 805 break; 806 } 807 if (easy) 808 goto record; 809 break; 810 811 case VSERROR: 812 c = p - var - 1; 813 error("${%.*s%s}: Bad substitution", c, var, 814 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 815 816 default: 817 abort(); 818 } 819 p[-1] = '='; /* recover overwritten '=' */ 820 821 if (subtype != VSNORMAL) { /* skip to end of alternative */ 822 int nesting = 1; 823 for (;;) { 824 if ((c = *p++) == CTLESC) 825 p++; 826 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 827 if (set) 828 argbackq = argbackq->next; 829 } else if (c == CTLVAR) { 830 if ((*p++ & VSTYPE) != VSNORMAL) 831 nesting++; 832 } else if (c == CTLENDVAR) { 833 if (--nesting == 0) 834 break; 835 } 836 } 837 } 838 return p; 839 } 840 841 842 843 /* 844 * Test whether a specialized variable is set. 845 */ 846 847 static int 848 varisset(char *name, int nulok) 849 { 850 851 if (*name == '!') 852 return backgndpidset(); 853 else if (*name == '@' || *name == '*') { 854 if (*shellparam.p == NULL) 855 return 0; 856 857 if (nulok) { 858 char **av; 859 860 for (av = shellparam.p; *av; av++) 861 if (**av != '\0') 862 return 1; 863 return 0; 864 } 865 } else if (is_digit(*name)) { 866 char *ap; 867 int num = atoi(name); 868 869 if (num > shellparam.nparam) 870 return 0; 871 872 if (num == 0) 873 ap = arg0; 874 else 875 ap = shellparam.p[num - 1]; 876 877 if (nulok && (ap == NULL || *ap == '\0')) 878 return 0; 879 } 880 return 1; 881 } 882 883 static void 884 strtodest(const char *p, int flag, int subtype, int quoted) 885 { 886 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 887 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 888 else 889 STPUTS(p, expdest); 890 } 891 892 /* 893 * Add the value of a specialized variable to the stack string. 894 */ 895 896 static void 897 varvalue(char *name, int quoted, int subtype, int flag) 898 { 899 int num; 900 char *p; 901 int i; 902 char sep; 903 char **ap; 904 905 switch (*name) { 906 case '$': 907 num = rootpid; 908 goto numvar; 909 case '?': 910 num = oexitstatus; 911 goto numvar; 912 case '#': 913 num = shellparam.nparam; 914 goto numvar; 915 case '!': 916 num = backgndpidval(); 917 numvar: 918 expdest = cvtnum(num, expdest); 919 break; 920 case '-': 921 for (i = 0 ; i < NOPTS ; i++) { 922 if (optlist[i].val) 923 STPUTC(optlist[i].letter, expdest); 924 } 925 break; 926 case '@': 927 if (flag & EXP_FULL && quoted) { 928 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 929 strtodest(p, flag, subtype, quoted); 930 if (*ap) 931 STPUTC('\0', expdest); 932 } 933 break; 934 } 935 /* FALLTHROUGH */ 936 case '*': 937 if (ifsset()) 938 sep = ifsval()[0]; 939 else 940 sep = ' '; 941 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 942 strtodest(p, flag, subtype, quoted); 943 if (!*ap) 944 break; 945 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 946 STPUTC(sep, expdest); 947 } 948 break; 949 case '0': 950 p = arg0; 951 strtodest(p, flag, subtype, quoted); 952 break; 953 default: 954 if (is_digit(*name)) { 955 num = atoi(name); 956 if (num > 0 && num <= shellparam.nparam) { 957 p = shellparam.p[num - 1]; 958 strtodest(p, flag, subtype, quoted); 959 } 960 } 961 break; 962 } 963 } 964 965 966 967 /* 968 * Record the fact that we have to scan this region of the 969 * string for IFS characters. 970 */ 971 972 static void 973 recordregion(int start, int end, int inquotes) 974 { 975 struct ifsregion *ifsp; 976 977 if (ifslastp == NULL) { 978 ifsp = &ifsfirst; 979 } else { 980 if (ifslastp->endoff == start 981 && ifslastp->inquotes == inquotes) { 982 /* extend previous area */ 983 ifslastp->endoff = end; 984 return; 985 } 986 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 987 ifslastp->next = ifsp; 988 } 989 ifslastp = ifsp; 990 ifslastp->next = NULL; 991 ifslastp->begoff = start; 992 ifslastp->endoff = end; 993 ifslastp->inquotes = inquotes; 994 } 995 996 997 998 /* 999 * Break the argument string into pieces based upon IFS and add the 1000 * strings to the argument list. The regions of the string to be 1001 * searched for IFS characters have been stored by recordregion. 1002 * CTLESC characters are preserved but have little effect in this pass 1003 * other than escaping CTL* characters. In particular, they do not escape 1004 * IFS characters: that should be done with the ifsregion mechanism. 1005 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 1006 * This pass treats them as a regular character, making the string non-empty. 1007 * Later, they are removed along with the other CTL* characters. 1008 */ 1009 static void 1010 ifsbreakup(char *string, struct arglist *arglist) 1011 { 1012 struct ifsregion *ifsp; 1013 struct strlist *sp; 1014 char *start; 1015 char *p; 1016 char *q; 1017 const char *ifs; 1018 const char *ifsspc; 1019 int had_param_ch = 0; 1020 1021 start = string; 1022 1023 if (ifslastp == NULL) { 1024 /* Return entire argument, IFS doesn't apply to any of it */ 1025 sp = (struct strlist *)stalloc(sizeof *sp); 1026 sp->text = start; 1027 *arglist->lastp = sp; 1028 arglist->lastp = &sp->next; 1029 return; 1030 } 1031 1032 ifs = ifsset() ? ifsval() : " \t\n"; 1033 1034 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1035 p = string + ifsp->begoff; 1036 while (p < string + ifsp->endoff) { 1037 q = p; 1038 if (*p == CTLESC) 1039 p++; 1040 if (ifsp->inquotes) { 1041 /* Only NULs (should be from "$@") end args */ 1042 had_param_ch = 1; 1043 if (*p != 0) { 1044 p++; 1045 continue; 1046 } 1047 ifsspc = NULL; 1048 } else { 1049 if (!strchr(ifs, *p)) { 1050 had_param_ch = 1; 1051 p++; 1052 continue; 1053 } 1054 ifsspc = strchr(" \t\n", *p); 1055 1056 /* Ignore IFS whitespace at start */ 1057 if (q == start && ifsspc != NULL) { 1058 p++; 1059 start = p; 1060 continue; 1061 } 1062 had_param_ch = 0; 1063 } 1064 1065 /* Save this argument... */ 1066 *q = '\0'; 1067 sp = (struct strlist *)stalloc(sizeof *sp); 1068 sp->text = start; 1069 *arglist->lastp = sp; 1070 arglist->lastp = &sp->next; 1071 p++; 1072 1073 if (ifsspc != NULL) { 1074 /* Ignore further trailing IFS whitespace */ 1075 for (; p < string + ifsp->endoff; p++) { 1076 q = p; 1077 if (*p == CTLESC) 1078 p++; 1079 if (strchr(ifs, *p) == NULL) { 1080 p = q; 1081 break; 1082 } 1083 if (strchr(" \t\n", *p) == NULL) { 1084 p++; 1085 break; 1086 } 1087 } 1088 } 1089 start = p; 1090 } 1091 } 1092 1093 /* 1094 * Save anything left as an argument. 1095 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1096 * generating 2 arguments, the second of which is empty. 1097 * Some recent clarification of the Posix spec say that it 1098 * should only generate one.... 1099 */ 1100 if (had_param_ch || *start != 0) { 1101 sp = (struct strlist *)stalloc(sizeof *sp); 1102 sp->text = start; 1103 *arglist->lastp = sp; 1104 arglist->lastp = &sp->next; 1105 } 1106 } 1107 1108 1109 static char expdir[PATH_MAX]; 1110 #define expdir_end (expdir + sizeof(expdir)) 1111 1112 /* 1113 * Perform pathname generation and remove control characters. 1114 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1115 * The results are stored in the list exparg. 1116 */ 1117 static void 1118 expandmeta(struct strlist *str, int flag __unused) 1119 { 1120 char *p; 1121 struct strlist **savelastp; 1122 struct strlist *sp; 1123 char c; 1124 /* TODO - EXP_REDIR */ 1125 1126 while (str) { 1127 if (fflag) 1128 goto nometa; 1129 p = str->text; 1130 for (;;) { /* fast check for meta chars */ 1131 if ((c = *p++) == '\0') 1132 goto nometa; 1133 if (c == '*' || c == '?' || c == '[') 1134 break; 1135 } 1136 savelastp = exparg.lastp; 1137 INTOFF; 1138 expmeta(expdir, str->text); 1139 INTON; 1140 if (exparg.lastp == savelastp) { 1141 /* 1142 * no matches 1143 */ 1144 nometa: 1145 *exparg.lastp = str; 1146 rmescapes(str->text); 1147 exparg.lastp = &str->next; 1148 } else { 1149 *exparg.lastp = NULL; 1150 *savelastp = sp = expsort(*savelastp); 1151 while (sp->next != NULL) 1152 sp = sp->next; 1153 exparg.lastp = &sp->next; 1154 } 1155 str = str->next; 1156 } 1157 } 1158 1159 1160 /* 1161 * Do metacharacter (i.e. *, ?, [...]) expansion. 1162 */ 1163 1164 static void 1165 expmeta(char *enddir, char *name) 1166 { 1167 const char *p; 1168 const char *q; 1169 const char *start; 1170 char *endname; 1171 int metaflag; 1172 struct stat statb; 1173 DIR *dirp; 1174 struct dirent *dp; 1175 int atend; 1176 int matchdot; 1177 int esc; 1178 int namlen; 1179 1180 metaflag = 0; 1181 start = name; 1182 for (p = name; esc = 0, *p; p += esc + 1) { 1183 if (*p == '*' || *p == '?') 1184 metaflag = 1; 1185 else if (*p == '[') { 1186 q = p + 1; 1187 if (*q == '!' || *q == '^') 1188 q++; 1189 for (;;) { 1190 while (*q == CTLQUOTEMARK) 1191 q++; 1192 if (*q == CTLESC) 1193 q++; 1194 if (*q == '/' || *q == '\0') 1195 break; 1196 if (*++q == ']') { 1197 metaflag = 1; 1198 break; 1199 } 1200 } 1201 } else if (*p == '\0') 1202 break; 1203 else if (*p == CTLQUOTEMARK) 1204 continue; 1205 else { 1206 if (*p == CTLESC) 1207 esc++; 1208 if (p[esc] == '/') { 1209 if (metaflag) 1210 break; 1211 start = p + esc + 1; 1212 } 1213 } 1214 } 1215 if (metaflag == 0) { /* we've reached the end of the file name */ 1216 if (enddir != expdir) 1217 metaflag++; 1218 for (p = name ; ; p++) { 1219 if (*p == CTLQUOTEMARK) 1220 continue; 1221 if (*p == CTLESC) 1222 p++; 1223 *enddir++ = *p; 1224 if (*p == '\0') 1225 break; 1226 if (enddir == expdir_end) 1227 return; 1228 } 1229 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1230 addfname(expdir); 1231 return; 1232 } 1233 endname = name + (p - name); 1234 if (start != name) { 1235 p = name; 1236 while (p < start) { 1237 while (*p == CTLQUOTEMARK) 1238 p++; 1239 if (*p == CTLESC) 1240 p++; 1241 *enddir++ = *p++; 1242 if (enddir == expdir_end) 1243 return; 1244 } 1245 } 1246 if (enddir == expdir) { 1247 p = "."; 1248 } else if (enddir == expdir + 1 && *expdir == '/') { 1249 p = "/"; 1250 } else { 1251 p = expdir; 1252 enddir[-1] = '\0'; 1253 } 1254 if ((dirp = opendir(p)) == NULL) 1255 return; 1256 if (enddir != expdir) 1257 enddir[-1] = '/'; 1258 if (*endname == 0) { 1259 atend = 1; 1260 } else { 1261 atend = 0; 1262 *endname = '\0'; 1263 endname += esc + 1; 1264 } 1265 matchdot = 0; 1266 p = start; 1267 while (*p == CTLQUOTEMARK) 1268 p++; 1269 if (*p == CTLESC) 1270 p++; 1271 if (*p == '.') 1272 matchdot++; 1273 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1274 if (dp->d_name[0] == '.' && ! matchdot) 1275 continue; 1276 if (patmatch(start, dp->d_name, 0)) { 1277 namlen = dp->d_namlen; 1278 if (enddir + namlen + 1 > expdir_end) 1279 continue; 1280 memcpy(enddir, dp->d_name, namlen + 1); 1281 if (atend) 1282 addfname(expdir); 1283 else { 1284 if (dp->d_type != DT_UNKNOWN && 1285 dp->d_type != DT_DIR && 1286 dp->d_type != DT_LNK) 1287 continue; 1288 if (enddir + namlen + 2 > expdir_end) 1289 continue; 1290 enddir[namlen] = '/'; 1291 enddir[namlen + 1] = '\0'; 1292 expmeta(enddir + namlen + 1, endname); 1293 } 1294 } 1295 } 1296 closedir(dirp); 1297 if (! atend) 1298 endname[-esc - 1] = esc ? CTLESC : '/'; 1299 } 1300 1301 1302 /* 1303 * Add a file name to the list. 1304 */ 1305 1306 static void 1307 addfname(char *name) 1308 { 1309 char *p; 1310 struct strlist *sp; 1311 size_t len; 1312 1313 len = strlen(name); 1314 p = stalloc(len + 1); 1315 memcpy(p, name, len + 1); 1316 sp = (struct strlist *)stalloc(sizeof *sp); 1317 sp->text = p; 1318 *exparg.lastp = sp; 1319 exparg.lastp = &sp->next; 1320 } 1321 1322 1323 /* 1324 * Sort the results of file name expansion. It calculates the number of 1325 * strings to sort and then calls msort (short for merge sort) to do the 1326 * work. 1327 */ 1328 1329 static struct strlist * 1330 expsort(struct strlist *str) 1331 { 1332 int len; 1333 struct strlist *sp; 1334 1335 len = 0; 1336 for (sp = str ; sp ; sp = sp->next) 1337 len++; 1338 return msort(str, len); 1339 } 1340 1341 1342 static struct strlist * 1343 msort(struct strlist *list, int len) 1344 { 1345 struct strlist *p, *q = NULL; 1346 struct strlist **lpp; 1347 int half; 1348 int n; 1349 1350 if (len <= 1) 1351 return list; 1352 half = len >> 1; 1353 p = list; 1354 for (n = half ; --n >= 0 ; ) { 1355 q = p; 1356 p = p->next; 1357 } 1358 q->next = NULL; /* terminate first half of list */ 1359 q = msort(list, half); /* sort first half of list */ 1360 p = msort(p, len - half); /* sort second half */ 1361 lpp = &list; 1362 for (;;) { 1363 if (strcmp(p->text, q->text) < 0) { 1364 *lpp = p; 1365 lpp = &p->next; 1366 if ((p = *lpp) == NULL) { 1367 *lpp = q; 1368 break; 1369 } 1370 } else { 1371 *lpp = q; 1372 lpp = &q->next; 1373 if ((q = *lpp) == NULL) { 1374 *lpp = p; 1375 break; 1376 } 1377 } 1378 } 1379 return list; 1380 } 1381 1382 1383 1384 static wchar_t 1385 get_wc(const char **p) 1386 { 1387 wchar_t c; 1388 int chrlen; 1389 1390 chrlen = mbtowc(&c, *p, 4); 1391 if (chrlen == 0) 1392 return 0; 1393 else if (chrlen == -1) 1394 c = 0; 1395 else 1396 *p += chrlen; 1397 return c; 1398 } 1399 1400 1401 /* 1402 * See if a character matches a character class, starting at the first colon 1403 * of "[:class:]". 1404 * If a valid character class is recognized, a pointer to the next character 1405 * after the final closing bracket is stored into *end, otherwise a null 1406 * pointer is stored into *end. 1407 */ 1408 static int 1409 match_charclass(const char *p, wchar_t chr, const char **end) 1410 { 1411 char name[20]; 1412 const char *nameend; 1413 wctype_t cclass; 1414 1415 *end = NULL; 1416 p++; 1417 nameend = strstr(p, ":]"); 1418 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1419 nameend == p) 1420 return 0; 1421 memcpy(name, p, nameend - p); 1422 name[nameend - p] = '\0'; 1423 *end = nameend + 2; 1424 cclass = wctype(name); 1425 /* An unknown class matches nothing but is valid nevertheless. */ 1426 if (cclass == 0) 1427 return 0; 1428 return iswctype(chr, cclass); 1429 } 1430 1431 1432 /* 1433 * Returns true if the pattern matches the string. 1434 */ 1435 1436 static int 1437 patmatch(const char *pattern, const char *string, int squoted) 1438 { 1439 const char *p, *q, *end; 1440 const char *bt_p, *bt_q; 1441 char c; 1442 wchar_t wc, wc2; 1443 1444 p = pattern; 1445 q = string; 1446 bt_p = NULL; 1447 bt_q = NULL; 1448 for (;;) { 1449 switch (c = *p++) { 1450 case '\0': 1451 if (*q != '\0') 1452 goto backtrack; 1453 return 1; 1454 case CTLESC: 1455 if (squoted && *q == CTLESC) 1456 q++; 1457 if (*q++ != *p++) 1458 goto backtrack; 1459 break; 1460 case CTLQUOTEMARK: 1461 continue; 1462 case '?': 1463 if (squoted && *q == CTLESC) 1464 q++; 1465 if (*q == '\0') 1466 return 0; 1467 if (localeisutf8) { 1468 wc = get_wc(&q); 1469 /* 1470 * A '?' does not match invalid UTF-8 but a 1471 * '*' does, so backtrack. 1472 */ 1473 if (wc == 0) 1474 goto backtrack; 1475 } else 1476 wc = (unsigned char)*q++; 1477 break; 1478 case '*': 1479 c = *p; 1480 while (c == CTLQUOTEMARK || c == '*') 1481 c = *++p; 1482 /* 1483 * If the pattern ends here, we know the string 1484 * matches without needing to look at the rest of it. 1485 */ 1486 if (c == '\0') 1487 return 1; 1488 /* 1489 * First try the shortest match for the '*' that 1490 * could work. We can forget any earlier '*' since 1491 * there is no way having it match more characters 1492 * can help us, given that we are already here. 1493 */ 1494 bt_p = p; 1495 bt_q = q; 1496 break; 1497 case '[': { 1498 const char *endp; 1499 int invert, found; 1500 wchar_t chr; 1501 1502 endp = p; 1503 if (*endp == '!' || *endp == '^') 1504 endp++; 1505 for (;;) { 1506 while (*endp == CTLQUOTEMARK) 1507 endp++; 1508 if (*endp == 0) 1509 goto dft; /* no matching ] */ 1510 if (*endp == CTLESC) 1511 endp++; 1512 if (*++endp == ']') 1513 break; 1514 } 1515 invert = 0; 1516 if (*p == '!' || *p == '^') { 1517 invert++; 1518 p++; 1519 } 1520 found = 0; 1521 if (squoted && *q == CTLESC) 1522 q++; 1523 if (*q == '\0') 1524 return 0; 1525 if (localeisutf8) { 1526 chr = get_wc(&q); 1527 if (chr == 0) 1528 goto backtrack; 1529 } else 1530 chr = (unsigned char)*q++; 1531 c = *p++; 1532 do { 1533 if (c == CTLQUOTEMARK) 1534 continue; 1535 if (c == '[' && *p == ':') { 1536 found |= match_charclass(p, chr, &end); 1537 if (end != NULL) 1538 p = end; 1539 } 1540 if (c == CTLESC) 1541 c = *p++; 1542 if (localeisutf8 && c & 0x80) { 1543 p--; 1544 wc = get_wc(&p); 1545 if (wc == 0) /* bad utf-8 */ 1546 return 0; 1547 } else 1548 wc = (unsigned char)c; 1549 if (*p == '-' && p[1] != ']') { 1550 p++; 1551 while (*p == CTLQUOTEMARK) 1552 p++; 1553 if (*p == CTLESC) 1554 p++; 1555 if (localeisutf8) { 1556 wc2 = get_wc(&p); 1557 if (wc2 == 0) /* bad utf-8 */ 1558 return 0; 1559 } else 1560 wc2 = (unsigned char)*p++; 1561 if ( collate_range_cmp(chr, wc) >= 0 1562 && collate_range_cmp(chr, wc2) <= 0 1563 ) 1564 found = 1; 1565 } else { 1566 if (chr == wc) 1567 found = 1; 1568 } 1569 } while ((c = *p++) != ']'); 1570 if (found == invert) 1571 goto backtrack; 1572 break; 1573 } 1574 dft: default: 1575 if (squoted && *q == CTLESC) 1576 q++; 1577 if (*q == '\0') 1578 return 0; 1579 if (*q++ == c) 1580 break; 1581 backtrack: 1582 /* 1583 * If we have a mismatch (other than hitting the end 1584 * of the string), go back to the last '*' seen and 1585 * have it match one additional character. 1586 */ 1587 if (bt_p == NULL) 1588 return 0; 1589 if (squoted && *bt_q == CTLESC) 1590 bt_q++; 1591 if (*bt_q == '\0') 1592 return 0; 1593 bt_q++; 1594 p = bt_p; 1595 q = bt_q; 1596 break; 1597 } 1598 } 1599 } 1600 1601 1602 1603 /* 1604 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1605 */ 1606 1607 void 1608 rmescapes(char *str) 1609 { 1610 char *p, *q; 1611 1612 p = str; 1613 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1614 if (*p++ == '\0') 1615 return; 1616 } 1617 q = p; 1618 while (*p) { 1619 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1620 p++; 1621 continue; 1622 } 1623 if (*p == CTLESC) 1624 p++; 1625 *q++ = *p++; 1626 } 1627 *q = '\0'; 1628 } 1629 1630 1631 1632 /* 1633 * See if a pattern matches in a case statement. 1634 */ 1635 1636 int 1637 casematch(union node *pattern, const char *val) 1638 { 1639 struct stackmark smark; 1640 int result; 1641 char *p; 1642 1643 setstackmark(&smark); 1644 argbackq = pattern->narg.backquote; 1645 STARTSTACKSTR(expdest); 1646 ifslastp = NULL; 1647 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1648 STPUTC('\0', expdest); 1649 p = grabstackstr(expdest); 1650 result = patmatch(p, val, 0); 1651 popstackmark(&smark); 1652 return result; 1653 } 1654 1655 /* 1656 * Our own itoa(). 1657 */ 1658 1659 static char * 1660 cvtnum(int num, char *buf) 1661 { 1662 char temp[32]; 1663 int neg = num < 0; 1664 char *p = temp + 31; 1665 1666 temp[31] = '\0'; 1667 1668 do { 1669 *--p = num % 10 + '0'; 1670 } while ((num /= 10) != 0); 1671 1672 if (neg) 1673 *--p = '-'; 1674 1675 STPUTS(p, buf); 1676 return buf; 1677 } 1678 1679 /* 1680 * Do most of the work for wordexp(3). 1681 */ 1682 1683 int 1684 wordexpcmd(int argc, char **argv) 1685 { 1686 size_t len; 1687 int i; 1688 1689 out1fmt("%08x", argc - 1); 1690 for (i = 1, len = 0; i < argc; i++) 1691 len += strlen(argv[i]); 1692 out1fmt("%08x", (int)len); 1693 for (i = 1; i < argc; i++) 1694 outbin(argv[i], strlen(argv[i]) + 1, out1); 1695 return (0); 1696 } 1697