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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)expand.c 8.5 (Berkeley) 5/15/95 39 * $FreeBSD: src/bin/sh/expand.c,v 1.86 2011/05/27 15:56:13 jilles Exp $ 40 */ 41 42 #include <sys/types.h> 43 #include <sys/time.h> 44 #include <sys/stat.h> 45 #include <dirent.h> 46 #include <errno.h> 47 #include <inttypes.h> 48 #include <limits.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <wchar.h> 55 56 /* 57 * Routines to expand arguments to commands. We have to deal with 58 * backquotes, shell variables, and file metacharacters. 59 */ 60 61 #include "shell.h" 62 #include "main.h" 63 #include "nodes.h" 64 #include "eval.h" 65 #include "expand.h" 66 #include "syntax.h" 67 #include "parser.h" 68 #include "jobs.h" 69 #include "options.h" 70 #include "var.h" 71 #include "input.h" 72 #include "output.h" 73 #include "memalloc.h" 74 #include "error.h" 75 #include "mystring.h" 76 #include "arith.h" 77 #include "show.h" 78 79 /* 80 * Structure specifying which parts of the string should be searched 81 * for IFS characters. 82 */ 83 84 struct ifsregion { 85 struct ifsregion *next; /* next region in list */ 86 int begoff; /* offset of start of region */ 87 int endoff; /* offset of end of region */ 88 int inquotes; /* search for nul bytes only */ 89 }; 90 91 92 static char *expdest; /* output of current string */ 93 static struct nodelist *argbackq; /* list of back quote expressions */ 94 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 95 static struct ifsregion *ifslastp; /* last struct in list */ 96 static struct arglist exparg; /* holds expanded arg list */ 97 98 static void argstr(char *, int); 99 static char *exptilde(char *, int); 100 static void expbackq(union node *, int, int); 101 static int subevalvar(char *, char *, int, int, int, int, int); 102 static char *evalvar(char *, int); 103 static int varisset(char *, int); 104 static void varvalue(char *, int, int, int); 105 static void recordregion(int, int, int); 106 static void removerecordregions(int); 107 static void ifsbreakup(char *, struct arglist *); 108 static void expandmeta(struct strlist *, int); 109 static void expmeta(char *, char *); 110 static void addfname(char *); 111 static struct strlist *expsort(struct strlist *); 112 static struct strlist *msort(struct strlist *, int); 113 static char *cvtnum(int, char *); 114 static int collate_range_cmp(wchar_t, wchar_t); 115 116 static int 117 collate_range_cmp(wchar_t c1, wchar_t c2) 118 { 119 static wchar_t s1[2], s2[2]; 120 121 s1[0] = c1; 122 s2[0] = c2; 123 return (wcscoll(s1, s2)); 124 } 125 126 /* 127 * Expand shell variables and backquotes inside a here document. 128 * union node *arg the document 129 * int fd; where to write the expanded version 130 */ 131 132 void 133 expandhere(union node *arg, int fd) 134 { 135 expandarg(arg, NULL, 0); 136 xwrite(fd, stackblock(), expdest - stackblock()); 137 } 138 139 static char * 140 stputs_quotes(const char *data, const char *syntax, char *p) 141 { 142 while (*data) { 143 CHECKSTRSPACE(2, p); 144 if (syntax[(int)*data] == CCTL) 145 USTPUTC(CTLESC, p); 146 USTPUTC(*data++, p); 147 } 148 return (p); 149 } 150 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) 151 152 /* 153 * Perform expansions on an argument, placing the resulting list of arguments 154 * in arglist. Parameter expansion, command substitution and arithmetic 155 * expansion are always performed; additional expansions can be requested 156 * via flag (EXP_*). 157 * The result is left in the stack string. 158 * When arglist is NULL, perform here document expansion. 159 * 160 * Caution: this function uses global state and is not reentrant. 161 * However, a new invocation after an interrupted invocation is safe 162 * and will reset the global state for the new call. 163 */ 164 void 165 expandarg(union node *arg, struct arglist *arglist, int flag) 166 { 167 struct strlist *sp; 168 char *p; 169 170 argbackq = arg->narg.backquote; 171 STARTSTACKSTR(expdest); 172 ifsfirst.next = NULL; 173 ifslastp = NULL; 174 argstr(arg->narg.text, flag); 175 if (arglist == NULL) { 176 return; /* here document expanded */ 177 } 178 STPUTC('\0', expdest); 179 p = grabstackstr(expdest); 180 exparg.lastp = &exparg.list; 181 /* 182 * TODO - EXP_REDIR 183 */ 184 if (flag & EXP_FULL) { 185 ifsbreakup(p, &exparg); 186 *exparg.lastp = NULL; 187 exparg.lastp = &exparg.list; 188 expandmeta(exparg.list, flag); 189 } else { 190 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 191 rmescapes(p); 192 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 193 sp->text = p; 194 *exparg.lastp = sp; 195 exparg.lastp = &sp->next; 196 } 197 while (ifsfirst.next != NULL) { 198 struct ifsregion *ifsp; 199 INTOFF; 200 ifsp = ifsfirst.next->next; 201 ckfree(ifsfirst.next); 202 ifsfirst.next = ifsp; 203 INTON; 204 } 205 *exparg.lastp = NULL; 206 if (exparg.list) { 207 *arglist->lastp = exparg.list; 208 arglist->lastp = exparg.lastp; 209 } 210 } 211 212 213 214 /* 215 * Perform parameter expansion, command substitution and arithmetic 216 * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 217 * Processing ends at a CTLENDVAR character as well as '\0'. 218 * This is used to expand word in ${var+word} etc. 219 * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC 220 * characters to allow for further processing. 221 * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 222 */ 223 static void 224 argstr(char *p, int flag) 225 { 226 char c; 227 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 228 int firsteq = 1; 229 int split_lit; 230 int lit_quoted; 231 232 split_lit = flag & EXP_SPLIT_LIT; 233 lit_quoted = flag & EXP_LIT_QUOTED; 234 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 235 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 236 p = exptilde(p, flag); 237 for (;;) { 238 CHECKSTRSPACE(2, expdest); 239 switch (c = *p++) { 240 case '\0': 241 case CTLENDVAR: 242 goto breakloop; 243 case CTLQUOTEMARK: 244 lit_quoted = 1; 245 /* "$@" syntax adherence hack */ 246 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 247 break; 248 if ((flag & EXP_FULL) != 0) 249 USTPUTC(c, expdest); 250 break; 251 case CTLQUOTEEND: 252 lit_quoted = 0; 253 break; 254 case CTLESC: 255 if (quotes) 256 USTPUTC(c, expdest); 257 c = *p++; 258 USTPUTC(c, expdest); 259 if (split_lit && !lit_quoted) 260 recordregion(expdest - stackblock() - 261 (quotes ? 2 : 1), 262 expdest - stackblock(), 0); 263 break; 264 case CTLVAR: 265 p = evalvar(p, flag); 266 break; 267 case CTLBACKQ: 268 case CTLBACKQ|CTLQUOTE: 269 expbackq(argbackq->n, c & CTLQUOTE, flag); 270 argbackq = argbackq->next; 271 break; 272 case CTLENDARI: 273 expari(flag); 274 break; 275 case ':': 276 case '=': 277 /* 278 * sort of a hack - expand tildes in variable 279 * assignments (after the first '=' and after ':'s). 280 */ 281 USTPUTC(c, expdest); 282 if (split_lit && !lit_quoted) 283 recordregion(expdest - stackblock() - 1, 284 expdest - stackblock(), 0); 285 if (flag & EXP_VARTILDE && *p == '~' && 286 (c != '=' || firsteq)) { 287 if (c == '=') 288 firsteq = 0; 289 p = exptilde(p, flag); 290 } 291 break; 292 default: 293 USTPUTC(c, expdest); 294 if (split_lit && !lit_quoted) 295 recordregion(expdest - stackblock() - 1, 296 expdest - stackblock(), 0); 297 } 298 } 299 breakloop:; 300 } 301 302 /* 303 * Perform tilde expansion, placing the result in the stack string and 304 * returning the next position in the input string to process. 305 */ 306 static char * 307 exptilde(char *p, int flag) 308 { 309 char c, *startp = p; 310 struct passwd *pw; 311 char *home; 312 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 313 314 while ((c = *p) != '\0') { 315 switch(c) { 316 case CTLESC: /* This means CTL* are always considered quoted. */ 317 case CTLVAR: 318 case CTLBACKQ: 319 case CTLBACKQ | CTLQUOTE: 320 case CTLARI: 321 case CTLENDARI: 322 case CTLQUOTEMARK: 323 return (startp); 324 case ':': 325 if (flag & EXP_VARTILDE) 326 goto done; 327 break; 328 case '/': 329 case CTLENDVAR: 330 goto done; 331 } 332 p++; 333 } 334 done: 335 *p = '\0'; 336 if (*(startp+1) == '\0') { 337 if ((home = lookupvar("HOME")) == NULL) 338 goto lose; 339 } else { 340 if ((pw = getpwnam(startp+1)) == NULL) 341 goto lose; 342 home = pw->pw_dir; 343 } 344 if (*home == '\0') 345 goto lose; 346 *p = c; 347 if (quotes) 348 STPUTS_QUOTES(home, SQSYNTAX, expdest); 349 else 350 STPUTS(home, expdest); 351 return (p); 352 lose: 353 *p = c; 354 return (startp); 355 } 356 357 358 static void 359 removerecordregions(int endoff) 360 { 361 if (ifslastp == NULL) 362 return; 363 364 if (ifsfirst.endoff > endoff) { 365 while (ifsfirst.next != NULL) { 366 struct ifsregion *ifsp; 367 INTOFF; 368 ifsp = ifsfirst.next->next; 369 ckfree(ifsfirst.next); 370 ifsfirst.next = ifsp; 371 INTON; 372 } 373 if (ifsfirst.begoff > endoff) 374 ifslastp = NULL; 375 else { 376 ifslastp = &ifsfirst; 377 ifsfirst.endoff = endoff; 378 } 379 return; 380 } 381 382 ifslastp = &ifsfirst; 383 while (ifslastp->next && ifslastp->next->begoff < endoff) 384 ifslastp=ifslastp->next; 385 while (ifslastp->next != NULL) { 386 struct ifsregion *ifsp; 387 INTOFF; 388 ifsp = ifslastp->next->next; 389 ckfree(ifslastp->next); 390 ifslastp->next = ifsp; 391 INTON; 392 } 393 if (ifslastp->endoff > endoff) 394 ifslastp->endoff = endoff; 395 } 396 397 /* 398 * Expand arithmetic expression. Backup to start of expression, 399 * evaluate, place result in (backed up) result, adjust string position. 400 */ 401 void 402 expari(int flag) 403 { 404 char *p, *q, *start; 405 arith_t result; 406 int begoff; 407 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 408 int quoted; 409 410 /* 411 * This routine is slightly over-complicated for 412 * efficiency. First we make sure there is 413 * enough space for the result, which may be bigger 414 * than the expression. Next we 415 * scan backwards looking for the start of arithmetic. If the 416 * next previous character is a CTLESC character, then we 417 * have to rescan starting from the beginning since CTLESC 418 * characters have to be processed left to right. 419 */ 420 CHECKSTRSPACE(DIGITS(result) - 2, expdest); 421 USTPUTC('\0', expdest); 422 start = stackblock(); 423 p = expdest - 2; 424 while (p >= start && *p != CTLARI) 425 --p; 426 if (p < start || *p != CTLARI) 427 error("missing CTLARI (shouldn't happen)"); 428 if (p > start && *(p - 1) == CTLESC) 429 for (p = start; *p != CTLARI; p++) 430 if (*p == CTLESC) 431 p++; 432 433 if (p[1] == '"') 434 quoted=1; 435 else 436 quoted=0; 437 begoff = p - start; 438 removerecordregions(begoff); 439 if (quotes) 440 rmescapes(p+2); 441 q = grabstackstr(expdest); 442 result = arith(p+2); 443 ungrabstackstr(q, expdest); 444 fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 445 while (*p++) 446 ; 447 if (quoted == 0) 448 recordregion(begoff, p - 1 - start, 0); 449 result = expdest - p + 1; 450 STADJUST(-result, expdest); 451 } 452 453 454 /* 455 * Perform command substitution. 456 */ 457 static void 458 expbackq(union node *cmd, int quoted, int flag) 459 { 460 struct backcmd in; 461 int i; 462 char buf[128]; 463 char *p; 464 char *dest = expdest; 465 struct ifsregion saveifs, *savelastp; 466 struct nodelist *saveargbackq; 467 char lastc; 468 int startloc = dest - stackblock(); 469 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 470 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 471 int nnl; 472 473 INTOFF; 474 saveifs = ifsfirst; 475 savelastp = ifslastp; 476 saveargbackq = argbackq; 477 p = grabstackstr(dest); 478 evalbackcmd(cmd, &in); 479 ungrabstackstr(p, dest); 480 ifsfirst = saveifs; 481 ifslastp = savelastp; 482 argbackq = saveargbackq; 483 484 p = in.buf; 485 lastc = '\0'; 486 nnl = 0; 487 /* Don't copy trailing newlines */ 488 for (;;) { 489 if (--in.nleft < 0) { 490 if (in.fd < 0) 491 break; 492 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 493 TRACE(("expbackq: read returns %d\n", i)); 494 if (i <= 0) 495 break; 496 p = buf; 497 in.nleft = i - 1; 498 } 499 lastc = *p++; 500 if (lastc != '\0') { 501 if (lastc == '\n') { 502 nnl++; 503 } else { 504 CHECKSTRSPACE(nnl + 2, dest); 505 while (nnl > 0) { 506 nnl--; 507 USTPUTC('\n', dest); 508 } 509 if (quotes && syntax[(int)lastc] == CCTL) 510 USTPUTC(CTLESC, dest); 511 USTPUTC(lastc, dest); 512 } 513 } 514 } 515 516 if (in.fd >= 0) 517 close(in.fd); 518 if (in.buf) 519 ckfree(in.buf); 520 if (in.jp) 521 exitstatus = waitforjob(in.jp, NULL); 522 if (quoted == 0) 523 recordregion(startloc, dest - stackblock(), 0); 524 TRACE(("expbackq: size=%td: \"%.*s\"\n", 525 ((dest - stackblock()) - startloc), 526 (int)((dest - stackblock()) - startloc), 527 stackblock() + startloc)); 528 expdest = dest; 529 INTON; 530 } 531 532 533 534 static int 535 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 536 int varflags, int quotes) 537 { 538 char *startp; 539 char *loc = NULL; 540 char *q; 541 int c = 0; 542 struct nodelist *saveargbackq = argbackq; 543 int amount; 544 545 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 546 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 547 EXP_CASE : 0) | EXP_TILDE); 548 STACKSTRNUL(expdest); 549 argbackq = saveargbackq; 550 startp = stackblock() + startloc; 551 if (str == NULL) 552 str = stackblock() + strloc; 553 554 switch (subtype) { 555 case VSASSIGN: 556 setvar(str, startp, 0); 557 amount = startp - expdest; 558 STADJUST(amount, expdest); 559 varflags &= ~VSNUL; 560 return 1; 561 562 case VSQUESTION: 563 if (*p != CTLENDVAR) { 564 outfmt(out2, "%s\n", startp); 565 error(NULL); 566 } 567 error("%.*s: parameter %snot set", (int)(p - str - 1), 568 str, (varflags & VSNUL) ? "null or " 569 : nullstr); 570 return 0; 571 572 case VSTRIMLEFT: 573 for (loc = startp; loc < str; loc++) { 574 c = *loc; 575 *loc = '\0'; 576 if (patmatch(str, startp, quotes)) { 577 *loc = c; 578 goto recordleft; 579 } 580 *loc = c; 581 if (quotes && *loc == CTLESC) 582 loc++; 583 } 584 return 0; 585 586 case VSTRIMLEFTMAX: 587 for (loc = str - 1; loc >= startp;) { 588 c = *loc; 589 *loc = '\0'; 590 if (patmatch(str, startp, quotes)) { 591 *loc = c; 592 goto recordleft; 593 } 594 *loc = c; 595 loc--; 596 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 597 for (q = startp; q < loc; q++) 598 if (*q == CTLESC) 599 q++; 600 if (q > loc) 601 loc--; 602 } 603 } 604 return 0; 605 606 case VSTRIMRIGHT: 607 for (loc = str - 1; loc >= startp;) { 608 if (patmatch(str, loc, quotes)) { 609 amount = loc - expdest; 610 STADJUST(amount, expdest); 611 return 1; 612 } 613 loc--; 614 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 615 for (q = startp; q < loc; q++) 616 if (*q == CTLESC) 617 q++; 618 if (q > loc) 619 loc--; 620 } 621 } 622 return 0; 623 624 case VSTRIMRIGHTMAX: 625 for (loc = startp; loc < str - 1; loc++) { 626 if (patmatch(str, loc, quotes)) { 627 amount = loc - expdest; 628 STADJUST(amount, expdest); 629 return 1; 630 } 631 if (quotes && *loc == CTLESC) 632 loc++; 633 } 634 return 0; 635 636 637 default: 638 abort(); 639 } 640 641 recordleft: 642 amount = ((str - 1) - (loc - startp)) - expdest; 643 STADJUST(amount, expdest); 644 while (loc != str - 1) 645 *startp++ = *loc++; 646 return 1; 647 } 648 649 650 /* 651 * Expand a variable, and return a pointer to the next character in the 652 * input string. 653 */ 654 655 static char * 656 evalvar(char *p, int flag) 657 { 658 int subtype; 659 int varflags; 660 char *var; 661 char *val; 662 int patloc; 663 int c; 664 int set; 665 int special; 666 int startloc; 667 int varlen; 668 int varlenb; 669 int easy; 670 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 671 672 varflags = (unsigned char)*p++; 673 subtype = varflags & VSTYPE; 674 var = p; 675 special = 0; 676 if (! is_name(*p)) 677 special = 1; 678 p = strchr(p, '=') + 1; 679 again: /* jump here after setting a variable with ${var=text} */ 680 if (varflags & VSLINENO) { 681 set = 1; 682 special = 0; 683 val = var; 684 p[-1] = '\0'; /* temporarily overwrite '=' to have \0 685 terminated string */ 686 } else if (special) { 687 set = varisset(var, varflags & VSNUL); 688 val = NULL; 689 } else { 690 val = bltinlookup(var, 1); 691 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 692 val = NULL; 693 set = 0; 694 } else 695 set = 1; 696 } 697 varlen = 0; 698 startloc = expdest - stackblock(); 699 if (!set && uflag && *var != '@' && *var != '*') { 700 switch (subtype) { 701 case VSNORMAL: 702 case VSTRIMLEFT: 703 case VSTRIMLEFTMAX: 704 case VSTRIMRIGHT: 705 case VSTRIMRIGHTMAX: 706 case VSLENGTH: 707 error("%.*s: parameter not set", (int)(p - var - 1), 708 var); 709 } 710 } 711 if (set && subtype != VSPLUS) { 712 /* insert the value of the variable */ 713 if (special) { 714 varvalue(var, varflags & VSQUOTE, subtype, flag); 715 if (subtype == VSLENGTH) { 716 varlenb = expdest - stackblock() - startloc; 717 varlen = varlenb; 718 if (localeisutf8) { 719 val = stackblock() + startloc; 720 for (;val != expdest; val++) 721 if ((*val & 0xC0) == 0x80) 722 varlen--; 723 } 724 STADJUST(-varlenb, expdest); 725 } 726 } else { 727 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 728 : BASESYNTAX; 729 730 if (subtype == VSLENGTH) { 731 for (;*val; val++) 732 if (!localeisutf8 || 733 (*val & 0xC0) != 0x80) 734 varlen++; 735 } 736 else { 737 if (quotes) 738 STPUTS_QUOTES(val, syntax, expdest); 739 else 740 STPUTS(val, expdest); 741 742 } 743 } 744 } 745 746 if (subtype == VSPLUS) 747 set = ! set; 748 749 easy = ((varflags & VSQUOTE) == 0 || 750 (*var == '@' && shellparam.nparam != 1)); 751 752 753 switch (subtype) { 754 case VSLENGTH: 755 expdest = cvtnum(varlen, expdest); 756 goto record; 757 758 case VSNORMAL: 759 if (!easy) 760 break; 761 record: 762 recordregion(startloc, expdest - stackblock(), 763 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' && 764 (*var == '@' || *var == '*'))); 765 break; 766 767 case VSPLUS: 768 case VSMINUS: 769 if (!set) { 770 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 771 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 772 break; 773 } 774 if (easy) 775 goto record; 776 break; 777 778 case VSTRIMLEFT: 779 case VSTRIMLEFTMAX: 780 case VSTRIMRIGHT: 781 case VSTRIMRIGHTMAX: 782 if (!set) 783 break; 784 /* 785 * Terminate the string and start recording the pattern 786 * right after it 787 */ 788 STPUTC('\0', expdest); 789 patloc = expdest - stackblock(); 790 if (subevalvar(p, NULL, patloc, subtype, 791 startloc, varflags, quotes) == 0) { 792 int amount = (expdest - stackblock() - patloc) + 1; 793 STADJUST(-amount, expdest); 794 } 795 /* Remove any recorded regions beyond start of variable */ 796 removerecordregions(startloc); 797 goto record; 798 799 case VSASSIGN: 800 case VSQUESTION: 801 if (!set) { 802 if (subevalvar(p, var, 0, subtype, startloc, varflags, 803 quotes)) { 804 varflags &= ~VSNUL; 805 /* 806 * Remove any recorded regions beyond 807 * start of variable 808 */ 809 removerecordregions(startloc); 810 goto again; 811 } 812 break; 813 } 814 if (easy) 815 goto record; 816 break; 817 818 case VSERROR: 819 c = p - var - 1; 820 error("${%.*s%s}: Bad substitution", c, var, 821 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 822 823 default: 824 abort(); 825 } 826 p[-1] = '='; /* recover overwritten '=' */ 827 828 if (subtype != VSNORMAL) { /* skip to end of alternative */ 829 int nesting = 1; 830 for (;;) { 831 if ((c = *p++) == CTLESC) 832 p++; 833 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 834 if (set) 835 argbackq = argbackq->next; 836 } else if (c == CTLVAR) { 837 if ((*p++ & VSTYPE) != VSNORMAL) 838 nesting++; 839 } else if (c == CTLENDVAR) { 840 if (--nesting == 0) 841 break; 842 } 843 } 844 } 845 return p; 846 } 847 848 849 850 /* 851 * Test whether a specialized variable is set. 852 */ 853 854 static int 855 varisset(char *name, int nulok) 856 { 857 858 if (*name == '!') 859 return backgndpidset(); 860 else if (*name == '@' || *name == '*') { 861 if (*shellparam.p == NULL) 862 return 0; 863 864 if (nulok) { 865 char **av; 866 867 for (av = shellparam.p; *av; av++) 868 if (**av != '\0') 869 return 1; 870 return 0; 871 } 872 } else if (is_digit(*name)) { 873 char *ap; 874 int num = atoi(name); 875 876 if (num > shellparam.nparam) 877 return 0; 878 879 if (num == 0) 880 ap = arg0; 881 else 882 ap = shellparam.p[num - 1]; 883 884 if (nulok && (ap == NULL || *ap == '\0')) 885 return 0; 886 } 887 return 1; 888 } 889 890 static void 891 strtodest(const char *p, int flag, int subtype, int quoted) 892 { 893 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 894 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 895 else 896 STPUTS(p, expdest); 897 } 898 899 /* 900 * Add the value of a specialized variable to the stack string. 901 */ 902 903 static void 904 varvalue(char *name, int quoted, int subtype, int flag) 905 { 906 int num; 907 char *p; 908 int i; 909 char sep; 910 char **ap; 911 912 switch (*name) { 913 case '$': 914 num = rootpid; 915 goto numvar; 916 case '?': 917 num = oexitstatus; 918 goto numvar; 919 case '#': 920 num = shellparam.nparam; 921 goto numvar; 922 case '!': 923 num = backgndpidval(); 924 numvar: 925 expdest = cvtnum(num, expdest); 926 break; 927 case '-': 928 for (i = 0 ; i < NOPTS ; i++) { 929 if (optlist[i].val) 930 STPUTC(optlist[i].letter, expdest); 931 } 932 break; 933 case '@': 934 if (flag & EXP_FULL && quoted) { 935 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 936 strtodest(p, flag, subtype, quoted); 937 if (*ap) 938 STPUTC('\0', expdest); 939 } 940 break; 941 } 942 /* FALLTHROUGH */ 943 case '*': 944 if (ifsset()) 945 sep = ifsval()[0]; 946 else 947 sep = ' '; 948 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 949 strtodest(p, flag, subtype, quoted); 950 if (!*ap) 951 break; 952 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 953 STPUTC(sep, expdest); 954 } 955 break; 956 case '0': 957 p = arg0; 958 strtodest(p, flag, subtype, quoted); 959 break; 960 default: 961 if (is_digit(*name)) { 962 num = atoi(name); 963 if (num > 0 && num <= shellparam.nparam) { 964 p = shellparam.p[num - 1]; 965 strtodest(p, flag, subtype, quoted); 966 } 967 } 968 break; 969 } 970 } 971 972 973 974 /* 975 * Record the fact that we have to scan this region of the 976 * string for IFS characters. 977 */ 978 979 static void 980 recordregion(int start, int end, int inquotes) 981 { 982 struct ifsregion *ifsp; 983 984 if (ifslastp == NULL) { 985 ifsp = &ifsfirst; 986 } else { 987 if (ifslastp->endoff == start 988 && ifslastp->inquotes == inquotes) { 989 /* extend previous area */ 990 ifslastp->endoff = end; 991 return; 992 } 993 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 994 ifslastp->next = ifsp; 995 } 996 ifslastp = ifsp; 997 ifslastp->next = NULL; 998 ifslastp->begoff = start; 999 ifslastp->endoff = end; 1000 ifslastp->inquotes = inquotes; 1001 } 1002 1003 1004 1005 /* 1006 * Break the argument string into pieces based upon IFS and add the 1007 * strings to the argument list. The regions of the string to be 1008 * searched for IFS characters have been stored by recordregion. 1009 * CTLESC characters are preserved but have little effect in this pass 1010 * other than escaping CTL* characters. In particular, they do not escape 1011 * IFS characters: that should be done with the ifsregion mechanism. 1012 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 1013 * This pass treats them as a regular character, making the string non-empty. 1014 * Later, they are removed along with the other CTL* characters. 1015 */ 1016 static void 1017 ifsbreakup(char *string, struct arglist *arglist) 1018 { 1019 struct ifsregion *ifsp; 1020 struct strlist *sp; 1021 char *start; 1022 char *p; 1023 char *q; 1024 const char *ifs; 1025 const char *ifsspc; 1026 int had_param_ch = 0; 1027 1028 start = string; 1029 1030 if (ifslastp == NULL) { 1031 /* Return entire argument, IFS doesn't apply to any of it */ 1032 sp = (struct strlist *)stalloc(sizeof *sp); 1033 sp->text = start; 1034 *arglist->lastp = sp; 1035 arglist->lastp = &sp->next; 1036 return; 1037 } 1038 1039 ifs = ifsset() ? ifsval() : " \t\n"; 1040 1041 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1042 p = string + ifsp->begoff; 1043 while (p < string + ifsp->endoff) { 1044 q = p; 1045 if (*p == CTLESC) 1046 p++; 1047 if (ifsp->inquotes) { 1048 /* Only NULs (should be from "$@") end args */ 1049 had_param_ch = 1; 1050 if (*p != 0) { 1051 p++; 1052 continue; 1053 } 1054 ifsspc = NULL; 1055 } else { 1056 if (!strchr(ifs, *p)) { 1057 had_param_ch = 1; 1058 p++; 1059 continue; 1060 } 1061 ifsspc = strchr(" \t\n", *p); 1062 1063 /* Ignore IFS whitespace at start */ 1064 if (q == start && ifsspc != NULL) { 1065 p++; 1066 start = p; 1067 continue; 1068 } 1069 had_param_ch = 0; 1070 } 1071 1072 /* Save this argument... */ 1073 *q = '\0'; 1074 sp = (struct strlist *)stalloc(sizeof *sp); 1075 sp->text = start; 1076 *arglist->lastp = sp; 1077 arglist->lastp = &sp->next; 1078 p++; 1079 1080 if (ifsspc != NULL) { 1081 /* Ignore further trailing IFS whitespace */ 1082 for (; p < string + ifsp->endoff; p++) { 1083 q = p; 1084 if (*p == CTLESC) 1085 p++; 1086 if (strchr(ifs, *p) == NULL) { 1087 p = q; 1088 break; 1089 } 1090 if (strchr(" \t\n", *p) == NULL) { 1091 p++; 1092 break; 1093 } 1094 } 1095 } 1096 start = p; 1097 } 1098 } 1099 1100 /* 1101 * Save anything left as an argument. 1102 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1103 * generating 2 arguments, the second of which is empty. 1104 * Some recent clarification of the Posix spec say that it 1105 * should only generate one.... 1106 */ 1107 if (had_param_ch || *start != 0) { 1108 sp = (struct strlist *)stalloc(sizeof *sp); 1109 sp->text = start; 1110 *arglist->lastp = sp; 1111 arglist->lastp = &sp->next; 1112 } 1113 } 1114 1115 1116 static char expdir[PATH_MAX]; 1117 #define expdir_end (expdir + sizeof(expdir)) 1118 1119 /* 1120 * Perform pathname generation and remove control characters. 1121 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1122 * The results are stored in the list exparg. 1123 */ 1124 static void 1125 expandmeta(struct strlist *str, int flag __unused) 1126 { 1127 char *p; 1128 struct strlist **savelastp; 1129 struct strlist *sp; 1130 char c; 1131 /* TODO - EXP_REDIR */ 1132 1133 while (str) { 1134 if (fflag) 1135 goto nometa; 1136 p = str->text; 1137 for (;;) { /* fast check for meta chars */ 1138 if ((c = *p++) == '\0') 1139 goto nometa; 1140 if (c == '*' || c == '?' || c == '[') 1141 break; 1142 } 1143 savelastp = exparg.lastp; 1144 INTOFF; 1145 expmeta(expdir, str->text); 1146 INTON; 1147 if (exparg.lastp == savelastp) { 1148 /* 1149 * no matches 1150 */ 1151 nometa: 1152 *exparg.lastp = str; 1153 rmescapes(str->text); 1154 exparg.lastp = &str->next; 1155 } else { 1156 *exparg.lastp = NULL; 1157 *savelastp = sp = expsort(*savelastp); 1158 while (sp->next != NULL) 1159 sp = sp->next; 1160 exparg.lastp = &sp->next; 1161 } 1162 str = str->next; 1163 } 1164 } 1165 1166 1167 /* 1168 * Do metacharacter (i.e. *, ?, [...]) expansion. 1169 */ 1170 1171 static void 1172 expmeta(char *enddir, char *name) 1173 { 1174 char *p; 1175 char *q; 1176 char *start; 1177 char *endname; 1178 int metaflag; 1179 struct stat statb; 1180 DIR *dirp; 1181 struct dirent *dp; 1182 int atend; 1183 int matchdot; 1184 int esc; 1185 1186 metaflag = 0; 1187 start = name; 1188 for (p = name; esc = 0, *p; p += esc + 1) { 1189 if (*p == '*' || *p == '?') 1190 metaflag = 1; 1191 else if (*p == '[') { 1192 q = p + 1; 1193 if (*q == '!' || *q == '^') 1194 q++; 1195 for (;;) { 1196 while (*q == CTLQUOTEMARK) 1197 q++; 1198 if (*q == CTLESC) 1199 q++; 1200 if (*q == '/' || *q == '\0') 1201 break; 1202 if (*++q == ']') { 1203 metaflag = 1; 1204 break; 1205 } 1206 } 1207 } else if (*p == '\0') 1208 break; 1209 else if (*p == CTLQUOTEMARK) 1210 continue; 1211 else { 1212 if (*p == CTLESC) 1213 esc++; 1214 if (p[esc] == '/') { 1215 if (metaflag) 1216 break; 1217 start = p + esc + 1; 1218 } 1219 } 1220 } 1221 if (metaflag == 0) { /* we've reached the end of the file name */ 1222 if (enddir != expdir) 1223 metaflag++; 1224 for (p = name ; ; p++) { 1225 if (*p == CTLQUOTEMARK) 1226 continue; 1227 if (*p == CTLESC) 1228 p++; 1229 *enddir++ = *p; 1230 if (*p == '\0') 1231 break; 1232 if (enddir == expdir_end) 1233 return; 1234 } 1235 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1236 addfname(expdir); 1237 return; 1238 } 1239 endname = p; 1240 if (start != name) { 1241 p = name; 1242 while (p < start) { 1243 while (*p == CTLQUOTEMARK) 1244 p++; 1245 if (*p == CTLESC) 1246 p++; 1247 *enddir++ = *p++; 1248 if (enddir == expdir_end) 1249 return; 1250 } 1251 } 1252 if (enddir == expdir) { 1253 p = __DECONST(char *, "."); 1254 } else if (enddir == expdir + 1 && *expdir == '/') { 1255 p = __DECONST(char *, "/"); 1256 } else { 1257 p = expdir; 1258 enddir[-1] = '\0'; 1259 } 1260 if ((dirp = opendir(p)) == NULL) 1261 return; 1262 if (enddir != expdir) 1263 enddir[-1] = '/'; 1264 if (*endname == 0) { 1265 atend = 1; 1266 } else { 1267 atend = 0; 1268 *endname = '\0'; 1269 endname += esc + 1; 1270 } 1271 matchdot = 0; 1272 p = start; 1273 while (*p == CTLQUOTEMARK) 1274 p++; 1275 if (*p == CTLESC) 1276 p++; 1277 if (*p == '.') 1278 matchdot++; 1279 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1280 if (dp->d_name[0] == '.' && ! matchdot) 1281 continue; 1282 if (patmatch(start, dp->d_name, 0)) { 1283 if (enddir + dp->d_namlen + 1 > expdir_end) 1284 continue; 1285 memcpy(enddir, dp->d_name, dp->d_namlen + 1); 1286 if (atend) 1287 addfname(expdir); 1288 else { 1289 if (enddir + dp->d_namlen + 2 > expdir_end) 1290 continue; 1291 enddir[dp->d_namlen] = '/'; 1292 enddir[dp->d_namlen + 1] = '\0'; 1293 expmeta(enddir + dp->d_namlen + 1, endname); 1294 } 1295 } 1296 } 1297 closedir(dirp); 1298 if (! atend) 1299 endname[-esc - 1] = esc ? CTLESC : '/'; 1300 } 1301 1302 1303 /* 1304 * Add a file name to the list. 1305 */ 1306 1307 static void 1308 addfname(char *name) 1309 { 1310 char *p; 1311 struct strlist *sp; 1312 1313 p = stalloc(strlen(name) + 1); 1314 scopy(name, p); 1315 sp = (struct strlist *)stalloc(sizeof *sp); 1316 sp->text = p; 1317 *exparg.lastp = sp; 1318 exparg.lastp = &sp->next; 1319 } 1320 1321 1322 /* 1323 * Sort the results of file name expansion. It calculates the number of 1324 * strings to sort and then calls msort (short for merge sort) to do the 1325 * work. 1326 */ 1327 1328 static struct strlist * 1329 expsort(struct strlist *str) 1330 { 1331 int len; 1332 struct strlist *sp; 1333 1334 len = 0; 1335 for (sp = str ; sp ; sp = sp->next) 1336 len++; 1337 return msort(str, len); 1338 } 1339 1340 1341 static struct strlist * 1342 msort(struct strlist *list, int len) 1343 { 1344 struct strlist *p, *q = NULL; 1345 struct strlist **lpp; 1346 int half; 1347 int n; 1348 1349 if (len <= 1) 1350 return list; 1351 half = len >> 1; 1352 p = list; 1353 for (n = half ; --n >= 0 ; ) { 1354 q = p; 1355 p = p->next; 1356 } 1357 q->next = NULL; /* terminate first half of list */ 1358 q = msort(list, half); /* sort first half of list */ 1359 p = msort(p, len - half); /* sort second half */ 1360 lpp = &list; 1361 for (;;) { 1362 if (strcmp(p->text, q->text) < 0) { 1363 *lpp = p; 1364 lpp = &p->next; 1365 if ((p = *lpp) == NULL) { 1366 *lpp = q; 1367 break; 1368 } 1369 } else { 1370 *lpp = q; 1371 lpp = &q->next; 1372 if ((q = *lpp) == NULL) { 1373 *lpp = p; 1374 break; 1375 } 1376 } 1377 } 1378 return list; 1379 } 1380 1381 1382 1383 static wchar_t 1384 get_wc(const char **p) 1385 { 1386 wchar_t c; 1387 int chrlen; 1388 1389 chrlen = mbtowc(&c, *p, 4); 1390 if (chrlen == 0) 1391 return 0; 1392 else if (chrlen == -1) 1393 c = 0; 1394 else 1395 *p += chrlen; 1396 return c; 1397 } 1398 1399 1400 /* 1401 * Returns true if the pattern matches the string. 1402 */ 1403 1404 int 1405 patmatch(const char *pattern, const char *string, int squoted) 1406 { 1407 const char *p, *q; 1408 char c; 1409 wchar_t wc, wc2; 1410 1411 p = pattern; 1412 q = string; 1413 for (;;) { 1414 switch (c = *p++) { 1415 case '\0': 1416 goto breakloop; 1417 case CTLESC: 1418 if (squoted && *q == CTLESC) 1419 q++; 1420 if (*q++ != *p++) 1421 return 0; 1422 break; 1423 case CTLQUOTEMARK: 1424 continue; 1425 case '?': 1426 if (squoted && *q == CTLESC) 1427 q++; 1428 if (localeisutf8) 1429 wc = get_wc(&q); 1430 else 1431 wc = (unsigned char)*q++; 1432 if (wc == '\0') 1433 return 0; 1434 break; 1435 case '*': 1436 c = *p; 1437 while (c == CTLQUOTEMARK || c == '*') 1438 c = *++p; 1439 if (c != CTLESC && c != CTLQUOTEMARK && 1440 c != '?' && c != '*' && c != '[') { 1441 while (*q != c) { 1442 if (squoted && *q == CTLESC && 1443 q[1] == c) 1444 break; 1445 if (*q == '\0') 1446 return 0; 1447 if (squoted && *q == CTLESC) 1448 q++; 1449 q++; 1450 } 1451 } 1452 do { 1453 if (patmatch(p, q, squoted)) 1454 return 1; 1455 if (squoted && *q == CTLESC) 1456 q++; 1457 } while (*q++ != '\0'); 1458 return 0; 1459 case '[': { 1460 const char *endp; 1461 int invert, found; 1462 wchar_t chr; 1463 1464 endp = p; 1465 if (*endp == '!' || *endp == '^') 1466 endp++; 1467 for (;;) { 1468 while (*endp == CTLQUOTEMARK) 1469 endp++; 1470 if (*endp == '\0') 1471 goto dft; /* no matching ] */ 1472 if (*endp == CTLESC) 1473 endp++; 1474 if (*++endp == ']') 1475 break; 1476 } 1477 invert = 0; 1478 if (*p == '!' || *p == '^') { 1479 invert++; 1480 p++; 1481 } 1482 found = 0; 1483 if (squoted && *q == CTLESC) 1484 q++; 1485 if (localeisutf8) 1486 chr = get_wc(&q); 1487 else 1488 chr = (unsigned char)*q++; 1489 if (chr == '\0') 1490 return 0; 1491 c = *p++; 1492 do { 1493 if (c == CTLQUOTEMARK) 1494 continue; 1495 if (c == CTLESC) 1496 c = *p++; 1497 if (localeisutf8 && c & 0x80) { 1498 p--; 1499 wc = get_wc(&p); 1500 if (wc == 0) /* bad utf-8 */ 1501 return 0; 1502 } else 1503 wc = (unsigned char)c; 1504 if (*p == '-' && p[1] != ']') { 1505 p++; 1506 while (*p == CTLQUOTEMARK) 1507 p++; 1508 if (*p == CTLESC) 1509 p++; 1510 if (localeisutf8) { 1511 wc2 = get_wc(&p); 1512 if (wc2 == 0) /* bad utf-8 */ 1513 return 0; 1514 } else 1515 wc2 = (unsigned char)*p++; 1516 if ( collate_range_cmp(chr, wc) >= 0 1517 && collate_range_cmp(chr, wc2) <= 0 1518 ) 1519 found = 1; 1520 } else { 1521 if (chr == wc) 1522 found = 1; 1523 } 1524 } while ((c = *p++) != ']'); 1525 if (found == invert) 1526 return 0; 1527 break; 1528 } 1529 dft: default: 1530 if (squoted && *q == CTLESC) 1531 q++; 1532 if (*q++ != c) 1533 return 0; 1534 break; 1535 } 1536 } 1537 breakloop: 1538 if (*q != '\0') 1539 return 0; 1540 return 1; 1541 } 1542 1543 1544 1545 /* 1546 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1547 */ 1548 1549 void 1550 rmescapes(char *str) 1551 { 1552 char *p, *q; 1553 1554 p = str; 1555 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1556 if (*p++ == '\0') 1557 return; 1558 } 1559 q = p; 1560 while (*p) { 1561 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1562 p++; 1563 continue; 1564 } 1565 if (*p == CTLESC) 1566 p++; 1567 *q++ = *p++; 1568 } 1569 *q = '\0'; 1570 } 1571 1572 1573 1574 /* 1575 * See if a pattern matches in a case statement. 1576 */ 1577 1578 int 1579 casematch(union node *pattern, const char *val) 1580 { 1581 struct stackmark smark; 1582 int result; 1583 char *p; 1584 1585 setstackmark(&smark); 1586 argbackq = pattern->narg.backquote; 1587 STARTSTACKSTR(expdest); 1588 ifslastp = NULL; 1589 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1590 STPUTC('\0', expdest); 1591 p = grabstackstr(expdest); 1592 result = patmatch(p, val, 0); 1593 popstackmark(&smark); 1594 return result; 1595 } 1596 1597 /* 1598 * Our own itoa(). 1599 */ 1600 1601 static char * 1602 cvtnum(int num, char *buf) 1603 { 1604 char temp[32]; 1605 int neg = num < 0; 1606 char *p = temp + 31; 1607 1608 temp[31] = '\0'; 1609 1610 do { 1611 *--p = num % 10 + '0'; 1612 } while ((num /= 10) != 0); 1613 1614 if (neg) 1615 *--p = '-'; 1616 1617 STPUTS(p, buf); 1618 return buf; 1619 } 1620 1621 /* 1622 * Check statically if expanding a string may have side effects. 1623 */ 1624 int 1625 expandhassideeffects(const char *p) 1626 { 1627 int c; 1628 int arinest; 1629 1630 arinest = 0; 1631 while ((c = *p++) != '\0') { 1632 switch (c) { 1633 case CTLESC: 1634 p++; 1635 break; 1636 case CTLVAR: 1637 c = *p++; 1638 /* Expanding $! sets the job to remembered. */ 1639 if (*p == '!') 1640 return 1; 1641 if ((c & VSTYPE) == VSASSIGN) 1642 return 1; 1643 /* 1644 * If we are in arithmetic, the parameter may contain 1645 * '=' which may cause side effects. Exceptions are 1646 * the length of a parameter and $$, $# and $? which 1647 * are always numeric. 1648 */ 1649 if ((c & VSTYPE) == VSLENGTH) { 1650 while (*p != '=') 1651 p++; 1652 p++; 1653 break; 1654 } 1655 if ((*p == '$' || *p == '#' || *p == '?') && 1656 p[1] == '=') { 1657 p += 2; 1658 break; 1659 } 1660 if (arinest > 0) 1661 return 1; 1662 break; 1663 case CTLBACKQ: 1664 case CTLBACKQ | CTLQUOTE: 1665 if (arinest > 0) 1666 return 1; 1667 break; 1668 case CTLARI: 1669 arinest++; 1670 break; 1671 case CTLENDARI: 1672 arinest--; 1673 break; 1674 case '=': 1675 if (*p == '=') { 1676 /* Allow '==' operator. */ 1677 p++; 1678 continue; 1679 } 1680 if (arinest > 0) 1681 return 1; 1682 break; 1683 case '!': case '<': case '>': 1684 /* Allow '!=', '<=', '>=' operators. */ 1685 if (*p == '=') 1686 p++; 1687 break; 1688 } 1689 } 1690 return 0; 1691 } 1692 1693 /* 1694 * Do most of the work for wordexp(3). 1695 */ 1696 1697 int 1698 wordexpcmd(int argc, char **argv) 1699 { 1700 size_t len; 1701 int i; 1702 1703 out1fmt("%08x", argc - 1); 1704 for (i = 1, len = 0; i < argc; i++) 1705 len += strlen(argv[i]); 1706 out1fmt("%08x", (int)len); 1707 for (i = 1; i < argc; i++) 1708 outbin(argv[i], strlen(argv[i]) + 1, out1); 1709 return (0); 1710 } 1711