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 57 /* 58 * Routines to expand arguments to commands. We have to deal with 59 * backquotes, shell variables, and file metacharacters. 60 */ 61 62 #include "shell.h" 63 #include "main.h" 64 #include "nodes.h" 65 #include "eval.h" 66 #include "expand.h" 67 #include "syntax.h" 68 #include "parser.h" 69 #include "jobs.h" 70 #include "options.h" 71 #include "var.h" 72 #include "input.h" 73 #include "output.h" 74 #include "memalloc.h" 75 #include "error.h" 76 #include "mystring.h" 77 #include "arith.h" 78 #include "show.h" 79 80 /* 81 * Structure specifying which parts of the string should be searched 82 * for IFS characters. 83 */ 84 85 struct ifsregion { 86 struct ifsregion *next; /* next region in list */ 87 int begoff; /* offset of start of region */ 88 int endoff; /* offset of end of region */ 89 int inquotes; /* search for nul bytes only */ 90 }; 91 92 93 static char *expdest; /* output of current string */ 94 static struct nodelist *argbackq; /* list of back quote expressions */ 95 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 96 static struct ifsregion *ifslastp; /* last struct in list */ 97 static struct arglist exparg; /* holds expanded arg list */ 98 99 static void argstr(char *, int); 100 static char *exptilde(char *, int); 101 static void expbackq(union node *, int, int); 102 static int subevalvar(char *, char *, int, int, int, int, int); 103 static char *evalvar(char *, int); 104 static int varisset(char *, int); 105 static void varvalue(char *, int, int, int); 106 static void recordregion(int, int, int); 107 static void removerecordregions(int); 108 static void ifsbreakup(char *, struct arglist *); 109 static void expandmeta(struct strlist *, int); 110 static void expmeta(char *, char *); 111 static void addfname(char *); 112 static struct strlist *expsort(struct strlist *); 113 static struct strlist *msort(struct strlist *, int); 114 static char *cvtnum(int, char *); 115 static int collate_range_cmp(wchar_t, wchar_t); 116 117 static int 118 collate_range_cmp(wchar_t c1, wchar_t c2) 119 { 120 static wchar_t s1[2], s2[2]; 121 122 s1[0] = c1; 123 s2[0] = c2; 124 return (wcscoll(s1, s2)); 125 } 126 127 /* 128 * Expand shell variables and backquotes inside a here document. 129 * union node *arg the document 130 * int fd; where to write the expanded version 131 */ 132 133 void 134 expandhere(union node *arg, int fd) 135 { 136 expandarg(arg, (struct arglist *)NULL, 0); 137 xwrite(fd, stackblock(), expdest - stackblock()); 138 } 139 140 static char * 141 stputs_quotes(const char *data, const char *syntax, char *p) 142 { 143 while (*data) { 144 CHECKSTRSPACE(2, p); 145 if (syntax[(int)*data] == CCTL) 146 USTPUTC(CTLESC, p); 147 USTPUTC(*data++, p); 148 } 149 return (p); 150 } 151 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) 152 153 /* 154 * Perform expansions on an argument, placing the resulting list of arguments 155 * in arglist. Parameter expansion, command substitution and arithmetic 156 * expansion are always performed; additional expansions can be requested 157 * via flag (EXP_*). 158 * The result is left in the stack string. 159 * When arglist is NULL, perform here document expansion. 160 * 161 * Caution: this function uses global state and is not reentrant. 162 * However, a new invocation after an interrupted invocation is safe 163 * and will reset the global state for the new call. 164 */ 165 void 166 expandarg(union node *arg, struct arglist *arglist, int flag) 167 { 168 struct strlist *sp; 169 char *p; 170 171 argbackq = arg->narg.backquote; 172 STARTSTACKSTR(expdest); 173 ifsfirst.next = NULL; 174 ifslastp = NULL; 175 argstr(arg->narg.text, flag); 176 if (arglist == NULL) { 177 return; /* here document expanded */ 178 } 179 STPUTC('\0', expdest); 180 p = grabstackstr(expdest); 181 exparg.lastp = &exparg.list; 182 /* 183 * TODO - EXP_REDIR 184 */ 185 if (flag & EXP_FULL) { 186 ifsbreakup(p, &exparg); 187 *exparg.lastp = NULL; 188 exparg.lastp = &exparg.list; 189 expandmeta(exparg.list, flag); 190 } else { 191 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 192 rmescapes(p); 193 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 194 sp->text = p; 195 *exparg.lastp = sp; 196 exparg.lastp = &sp->next; 197 } 198 while (ifsfirst.next != NULL) { 199 struct ifsregion *ifsp; 200 INTOFF; 201 ifsp = ifsfirst.next->next; 202 ckfree(ifsfirst.next); 203 ifsfirst.next = ifsp; 204 INTON; 205 } 206 *exparg.lastp = NULL; 207 if (exparg.list) { 208 *arglist->lastp = exparg.list; 209 arglist->lastp = exparg.lastp; 210 } 211 } 212 213 214 215 /* 216 * Perform parameter expansion, command substitution and arithmetic 217 * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 218 * Processing ends at a CTLENDVAR character as well as '\0'. 219 * This is used to expand word in ${var+word} etc. 220 * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC 221 * characters to allow for further processing. 222 * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 223 */ 224 static void 225 argstr(char *p, int flag) 226 { 227 char c; 228 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 229 int firsteq = 1; 230 int split_lit; 231 int lit_quoted; 232 233 split_lit = flag & EXP_SPLIT_LIT; 234 lit_quoted = flag & EXP_LIT_QUOTED; 235 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 236 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 237 p = exptilde(p, flag); 238 for (;;) { 239 CHECKSTRSPACE(2, expdest); 240 switch (c = *p++) { 241 case '\0': 242 case CTLENDVAR: 243 goto breakloop; 244 case CTLQUOTEMARK: 245 lit_quoted = 1; 246 /* "$@" syntax adherence hack */ 247 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 248 break; 249 if ((flag & EXP_FULL) != 0) 250 USTPUTC(c, expdest); 251 break; 252 case CTLQUOTEEND: 253 lit_quoted = 0; 254 break; 255 case CTLESC: 256 if (quotes) 257 USTPUTC(c, expdest); 258 c = *p++; 259 USTPUTC(c, expdest); 260 if (split_lit && !lit_quoted) 261 recordregion(expdest - stackblock() - 262 (quotes ? 2 : 1), 263 expdest - stackblock(), 0); 264 break; 265 case CTLVAR: 266 p = evalvar(p, flag); 267 break; 268 case CTLBACKQ: 269 case CTLBACKQ|CTLQUOTE: 270 expbackq(argbackq->n, c & CTLQUOTE, flag); 271 argbackq = argbackq->next; 272 break; 273 case CTLENDARI: 274 expari(flag); 275 break; 276 case ':': 277 case '=': 278 /* 279 * sort of a hack - expand tildes in variable 280 * assignments (after the first '=' and after ':'s). 281 */ 282 USTPUTC(c, expdest); 283 if (split_lit && !lit_quoted) 284 recordregion(expdest - stackblock() - 1, 285 expdest - stackblock(), 0); 286 if (flag & EXP_VARTILDE && *p == '~' && 287 (c != '=' || firsteq)) { 288 if (c == '=') 289 firsteq = 0; 290 p = exptilde(p, flag); 291 } 292 break; 293 default: 294 USTPUTC(c, expdest); 295 if (split_lit && !lit_quoted) 296 recordregion(expdest - stackblock() - 1, 297 expdest - stackblock(), 0); 298 } 299 } 300 breakloop:; 301 } 302 303 /* 304 * Perform tilde expansion, placing the result in the stack string and 305 * returning the next position in the input string to process. 306 */ 307 static char * 308 exptilde(char *p, int flag) 309 { 310 char c, *startp = p; 311 struct passwd *pw; 312 char *home; 313 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 314 315 while ((c = *p) != '\0') { 316 switch(c) { 317 case CTLESC: /* This means CTL* are always considered quoted. */ 318 case CTLVAR: 319 case CTLBACKQ: 320 case CTLBACKQ | CTLQUOTE: 321 case CTLARI: 322 case CTLENDARI: 323 case CTLQUOTEMARK: 324 return (startp); 325 case ':': 326 if (flag & EXP_VARTILDE) 327 goto done; 328 break; 329 case '/': 330 case CTLENDVAR: 331 goto done; 332 } 333 p++; 334 } 335 done: 336 *p = '\0'; 337 if (*(startp+1) == '\0') { 338 if ((home = lookupvar("HOME")) == NULL) 339 goto lose; 340 } else { 341 if ((pw = getpwnam(startp+1)) == NULL) 342 goto lose; 343 home = pw->pw_dir; 344 } 345 if (*home == '\0') 346 goto lose; 347 *p = c; 348 if (quotes) 349 STPUTS_QUOTES(home, SQSYNTAX, expdest); 350 else 351 STPUTS(home, expdest); 352 return (p); 353 lose: 354 *p = c; 355 return (startp); 356 } 357 358 359 static void 360 removerecordregions(int endoff) 361 { 362 if (ifslastp == NULL) 363 return; 364 365 if (ifsfirst.endoff > endoff) { 366 while (ifsfirst.next != NULL) { 367 struct ifsregion *ifsp; 368 INTOFF; 369 ifsp = ifsfirst.next->next; 370 ckfree(ifsfirst.next); 371 ifsfirst.next = ifsp; 372 INTON; 373 } 374 if (ifsfirst.begoff > endoff) 375 ifslastp = NULL; 376 else { 377 ifslastp = &ifsfirst; 378 ifsfirst.endoff = endoff; 379 } 380 return; 381 } 382 383 ifslastp = &ifsfirst; 384 while (ifslastp->next && ifslastp->next->begoff < endoff) 385 ifslastp=ifslastp->next; 386 while (ifslastp->next != NULL) { 387 struct ifsregion *ifsp; 388 INTOFF; 389 ifsp = ifslastp->next->next; 390 ckfree(ifslastp->next); 391 ifslastp->next = ifsp; 392 INTON; 393 } 394 if (ifslastp->endoff > endoff) 395 ifslastp->endoff = endoff; 396 } 397 398 /* 399 * Expand arithmetic expression. Backup to start of expression, 400 * evaluate, place result in (backed up) result, adjust string position. 401 */ 402 void 403 expari(int flag) 404 { 405 char *p, *q, *start; 406 arith_t result; 407 int begoff; 408 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 409 int quoted; 410 411 /* 412 * This routine is slightly over-complicated for 413 * efficiency. First we make sure there is 414 * enough space for the result, which may be bigger 415 * than the expression. Next we 416 * scan backwards looking for the start of arithmetic. If the 417 * next previous character is a CTLESC character, then we 418 * have to rescan starting from the beginning since CTLESC 419 * characters have to be processed left to right. 420 */ 421 CHECKSTRSPACE(DIGITS(result) - 2, expdest); 422 USTPUTC('\0', expdest); 423 start = stackblock(); 424 p = expdest - 2; 425 while (p >= start && *p != CTLARI) 426 --p; 427 if (p < start || *p != CTLARI) 428 error("missing CTLARI (shouldn't happen)"); 429 if (p > start && *(p - 1) == CTLESC) 430 for (p = start; *p != CTLARI; p++) 431 if (*p == CTLESC) 432 p++; 433 434 if (p[1] == '"') 435 quoted=1; 436 else 437 quoted=0; 438 begoff = p - start; 439 removerecordregions(begoff); 440 if (quotes) 441 rmescapes(p+2); 442 q = grabstackstr(expdest); 443 result = arith(p+2); 444 ungrabstackstr(q, expdest); 445 fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 446 while (*p++) 447 ; 448 if (quoted == 0) 449 recordregion(begoff, p - 1 - start, 0); 450 result = expdest - p + 1; 451 STADJUST(-result, expdest); 452 } 453 454 455 /* 456 * Perform command substitution. 457 */ 458 static void 459 expbackq(union node *cmd, int quoted, int flag) 460 { 461 struct backcmd in; 462 int i; 463 char buf[128]; 464 char *p; 465 char *dest = expdest; 466 struct ifsregion saveifs, *savelastp; 467 struct nodelist *saveargbackq; 468 char lastc; 469 int startloc = dest - stackblock(); 470 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 471 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 472 int nnl; 473 474 INTOFF; 475 saveifs = ifsfirst; 476 savelastp = ifslastp; 477 saveargbackq = argbackq; 478 p = grabstackstr(dest); 479 evalbackcmd(cmd, &in); 480 ungrabstackstr(p, dest); 481 ifsfirst = saveifs; 482 ifslastp = savelastp; 483 argbackq = saveargbackq; 484 485 p = in.buf; 486 lastc = '\0'; 487 nnl = 0; 488 /* Don't copy trailing newlines */ 489 for (;;) { 490 if (--in.nleft < 0) { 491 if (in.fd < 0) 492 break; 493 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 494 TRACE(("expbackq: read returns %d\n", i)); 495 if (i <= 0) 496 break; 497 p = buf; 498 in.nleft = i - 1; 499 } 500 lastc = *p++; 501 if (lastc != '\0') { 502 if (lastc == '\n') { 503 nnl++; 504 } else { 505 CHECKSTRSPACE(nnl + 2, dest); 506 while (nnl > 0) { 507 nnl--; 508 USTPUTC('\n', dest); 509 } 510 if (quotes && syntax[(int)lastc] == CCTL) 511 USTPUTC(CTLESC, dest); 512 USTPUTC(lastc, dest); 513 } 514 } 515 } 516 517 if (in.fd >= 0) 518 close(in.fd); 519 if (in.buf) 520 ckfree(in.buf); 521 if (in.jp) 522 exitstatus = waitforjob(in.jp, (int *)NULL); 523 if (quoted == 0) 524 recordregion(startloc, dest - stackblock(), 0); 525 TRACE(("expbackq: size=%td: \"%.*s\"\n", 526 ((dest - stackblock()) - startloc), 527 (int)((dest - stackblock()) - startloc), 528 stackblock() + startloc)); 529 expdest = dest; 530 INTON; 531 } 532 533 534 535 static int 536 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 537 int varflags, int quotes) 538 { 539 char *startp; 540 char *loc = NULL; 541 char *q; 542 int c = 0; 543 struct nodelist *saveargbackq = argbackq; 544 int amount; 545 546 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 547 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 548 EXP_CASE : 0) | EXP_TILDE); 549 STACKSTRNUL(expdest); 550 argbackq = saveargbackq; 551 startp = stackblock() + startloc; 552 if (str == NULL) 553 str = stackblock() + strloc; 554 555 switch (subtype) { 556 case VSASSIGN: 557 setvar(str, startp, 0); 558 amount = startp - expdest; 559 STADJUST(amount, expdest); 560 varflags &= ~VSNUL; 561 return 1; 562 563 case VSQUESTION: 564 if (*p != CTLENDVAR) { 565 outfmt(out2, "%s\n", startp); 566 error((char *)NULL); 567 } 568 error("%.*s: parameter %snot set", (int)(p - str - 1), 569 str, (varflags & VSNUL) ? "null or " 570 : nullstr); 571 return 0; 572 573 case VSTRIMLEFT: 574 for (loc = startp; loc < str; loc++) { 575 c = *loc; 576 *loc = '\0'; 577 if (patmatch(str, startp, quotes)) { 578 *loc = c; 579 goto recordleft; 580 } 581 *loc = c; 582 if (quotes && *loc == CTLESC) 583 loc++; 584 } 585 return 0; 586 587 case VSTRIMLEFTMAX: 588 for (loc = str - 1; loc >= startp;) { 589 c = *loc; 590 *loc = '\0'; 591 if (patmatch(str, startp, quotes)) { 592 *loc = c; 593 goto recordleft; 594 } 595 *loc = c; 596 loc--; 597 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 598 for (q = startp; q < loc; q++) 599 if (*q == CTLESC) 600 q++; 601 if (q > loc) 602 loc--; 603 } 604 } 605 return 0; 606 607 case VSTRIMRIGHT: 608 for (loc = str - 1; loc >= startp;) { 609 if (patmatch(str, loc, quotes)) { 610 amount = loc - expdest; 611 STADJUST(amount, expdest); 612 return 1; 613 } 614 loc--; 615 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 616 for (q = startp; q < loc; q++) 617 if (*q == CTLESC) 618 q++; 619 if (q > loc) 620 loc--; 621 } 622 } 623 return 0; 624 625 case VSTRIMRIGHTMAX: 626 for (loc = startp; loc < str - 1; loc++) { 627 if (patmatch(str, loc, quotes)) { 628 amount = loc - expdest; 629 STADJUST(amount, expdest); 630 return 1; 631 } 632 if (quotes && *loc == CTLESC) 633 loc++; 634 } 635 return 0; 636 637 638 default: 639 abort(); 640 } 641 642 recordleft: 643 amount = ((str - 1) - (loc - startp)) - expdest; 644 STADJUST(amount, expdest); 645 while (loc != str - 1) 646 *startp++ = *loc++; 647 return 1; 648 } 649 650 651 /* 652 * Expand a variable, and return a pointer to the next character in the 653 * input string. 654 */ 655 656 static char * 657 evalvar(char *p, int flag) 658 { 659 int subtype; 660 int varflags; 661 char *var; 662 char *val; 663 int patloc; 664 int c; 665 int set; 666 int special; 667 int startloc; 668 int varlen; 669 int varlenb; 670 int easy; 671 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 672 673 varflags = (unsigned char)*p++; 674 subtype = varflags & VSTYPE; 675 var = p; 676 special = 0; 677 if (! is_name(*p)) 678 special = 1; 679 p = strchr(p, '=') + 1; 680 again: /* jump here after setting a variable with ${var=text} */ 681 if (varflags & VSLINENO) { 682 set = 1; 683 special = 0; 684 val = var; 685 p[-1] = '\0'; /* temporarily overwrite '=' to have \0 686 terminated string */ 687 } else if (special) { 688 set = varisset(var, varflags & VSNUL); 689 val = NULL; 690 } else { 691 val = bltinlookup(var, 1); 692 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 693 val = NULL; 694 set = 0; 695 } else 696 set = 1; 697 } 698 varlen = 0; 699 startloc = expdest - stackblock(); 700 if (!set && uflag && *var != '@' && *var != '*') { 701 switch (subtype) { 702 case VSNORMAL: 703 case VSTRIMLEFT: 704 case VSTRIMLEFTMAX: 705 case VSTRIMRIGHT: 706 case VSTRIMRIGHTMAX: 707 case VSLENGTH: 708 error("%.*s: parameter not set", (int)(p - var - 1), 709 var); 710 } 711 } 712 if (set && subtype != VSPLUS) { 713 /* insert the value of the variable */ 714 if (special) { 715 varvalue(var, varflags & VSQUOTE, subtype, flag); 716 if (subtype == VSLENGTH) { 717 varlenb = expdest - stackblock() - startloc; 718 varlen = varlenb; 719 if (localeisutf8) { 720 val = stackblock() + startloc; 721 for (;val != expdest; val++) 722 if ((*val & 0xC0) == 0x80) 723 varlen--; 724 } 725 STADJUST(-varlenb, expdest); 726 } 727 } else { 728 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 729 : BASESYNTAX; 730 731 if (subtype == VSLENGTH) { 732 for (;*val; val++) 733 if (!localeisutf8 || 734 (*val & 0xC0) != 0x80) 735 varlen++; 736 } 737 else { 738 if (quotes) 739 STPUTS_QUOTES(val, syntax, expdest); 740 else 741 STPUTS(val, expdest); 742 743 } 744 } 745 } 746 747 if (subtype == VSPLUS) 748 set = ! set; 749 750 easy = ((varflags & VSQUOTE) == 0 || 751 (*var == '@' && shellparam.nparam != 1)); 752 753 754 switch (subtype) { 755 case VSLENGTH: 756 expdest = cvtnum(varlen, expdest); 757 goto record; 758 759 case VSNORMAL: 760 if (!easy) 761 break; 762 record: 763 recordregion(startloc, expdest - stackblock(), 764 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' && 765 (*var == '@' || *var == '*'))); 766 break; 767 768 case VSPLUS: 769 case VSMINUS: 770 if (!set) { 771 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 772 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 773 break; 774 } 775 if (easy) 776 goto record; 777 break; 778 779 case VSTRIMLEFT: 780 case VSTRIMLEFTMAX: 781 case VSTRIMRIGHT: 782 case VSTRIMRIGHTMAX: 783 if (!set) 784 break; 785 /* 786 * Terminate the string and start recording the pattern 787 * right after it 788 */ 789 STPUTC('\0', expdest); 790 patloc = expdest - stackblock(); 791 if (subevalvar(p, NULL, patloc, subtype, 792 startloc, varflags, quotes) == 0) { 793 int amount = (expdest - stackblock() - patloc) + 1; 794 STADJUST(-amount, expdest); 795 } 796 /* Remove any recorded regions beyond start of variable */ 797 removerecordregions(startloc); 798 goto record; 799 800 case VSASSIGN: 801 case VSQUESTION: 802 if (!set) { 803 if (subevalvar(p, var, 0, subtype, startloc, varflags, 804 quotes)) { 805 varflags &= ~VSNUL; 806 /* 807 * Remove any recorded regions beyond 808 * start of variable 809 */ 810 removerecordregions(startloc); 811 goto again; 812 } 813 break; 814 } 815 if (easy) 816 goto record; 817 break; 818 819 case VSERROR: 820 c = p - var - 1; 821 error("${%.*s%s}: Bad substitution", c, var, 822 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 823 824 default: 825 abort(); 826 } 827 p[-1] = '='; /* recover overwritten '=' */ 828 829 if (subtype != VSNORMAL) { /* skip to end of alternative */ 830 int nesting = 1; 831 for (;;) { 832 if ((c = *p++) == CTLESC) 833 p++; 834 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 835 if (set) 836 argbackq = argbackq->next; 837 } else if (c == CTLVAR) { 838 if ((*p++ & VSTYPE) != VSNORMAL) 839 nesting++; 840 } else if (c == CTLENDVAR) { 841 if (--nesting == 0) 842 break; 843 } 844 } 845 } 846 return p; 847 } 848 849 850 851 /* 852 * Test whether a specialized variable is set. 853 */ 854 855 static int 856 varisset(char *name, int nulok) 857 { 858 859 if (*name == '!') 860 return backgndpidset(); 861 else if (*name == '@' || *name == '*') { 862 if (*shellparam.p == NULL) 863 return 0; 864 865 if (nulok) { 866 char **av; 867 868 for (av = shellparam.p; *av; av++) 869 if (**av != '\0') 870 return 1; 871 return 0; 872 } 873 } else if (is_digit(*name)) { 874 char *ap; 875 int num = atoi(name); 876 877 if (num > shellparam.nparam) 878 return 0; 879 880 if (num == 0) 881 ap = arg0; 882 else 883 ap = shellparam.p[num - 1]; 884 885 if (nulok && (ap == NULL || *ap == '\0')) 886 return 0; 887 } 888 return 1; 889 } 890 891 static void 892 strtodest(const char *p, int flag, int subtype, int quoted) 893 { 894 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 895 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 896 else 897 STPUTS(p, expdest); 898 } 899 900 /* 901 * Add the value of a specialized variable to the stack string. 902 */ 903 904 static void 905 varvalue(char *name, int quoted, int subtype, int flag) 906 { 907 int num; 908 char *p; 909 int i; 910 char sep; 911 char **ap; 912 913 switch (*name) { 914 case '$': 915 num = rootpid; 916 goto numvar; 917 case '?': 918 num = oexitstatus; 919 goto numvar; 920 case '#': 921 num = shellparam.nparam; 922 goto numvar; 923 case '!': 924 num = backgndpidval(); 925 numvar: 926 expdest = cvtnum(num, expdest); 927 break; 928 case '-': 929 for (i = 0 ; i < NOPTS ; i++) { 930 if (optlist[i].val) 931 STPUTC(optlist[i].letter, expdest); 932 } 933 break; 934 case '@': 935 if (flag & EXP_FULL && quoted) { 936 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 937 strtodest(p, flag, subtype, quoted); 938 if (*ap) 939 STPUTC('\0', expdest); 940 } 941 break; 942 } 943 /* FALLTHROUGH */ 944 case '*': 945 if (ifsset()) 946 sep = ifsval()[0]; 947 else 948 sep = ' '; 949 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 950 strtodest(p, flag, subtype, quoted); 951 if (!*ap) 952 break; 953 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 954 STPUTC(sep, expdest); 955 } 956 break; 957 case '0': 958 p = arg0; 959 strtodest(p, flag, subtype, quoted); 960 break; 961 default: 962 if (is_digit(*name)) { 963 num = atoi(name); 964 if (num > 0 && num <= shellparam.nparam) { 965 p = shellparam.p[num - 1]; 966 strtodest(p, flag, subtype, quoted); 967 } 968 } 969 break; 970 } 971 } 972 973 974 975 /* 976 * Record the fact that we have to scan this region of the 977 * string for IFS characters. 978 */ 979 980 static void 981 recordregion(int start, int end, int inquotes) 982 { 983 struct ifsregion *ifsp; 984 985 if (ifslastp == NULL) { 986 ifsp = &ifsfirst; 987 } else { 988 if (ifslastp->endoff == start 989 && ifslastp->inquotes == inquotes) { 990 /* extend previous area */ 991 ifslastp->endoff = end; 992 return; 993 } 994 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 995 ifslastp->next = ifsp; 996 } 997 ifslastp = ifsp; 998 ifslastp->next = NULL; 999 ifslastp->begoff = start; 1000 ifslastp->endoff = end; 1001 ifslastp->inquotes = inquotes; 1002 } 1003 1004 1005 1006 /* 1007 * Break the argument string into pieces based upon IFS and add the 1008 * strings to the argument list. The regions of the string to be 1009 * searched for IFS characters have been stored by recordregion. 1010 * CTLESC characters are preserved but have little effect in this pass 1011 * other than escaping CTL* characters. In particular, they do not escape 1012 * IFS characters: that should be done with the ifsregion mechanism. 1013 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 1014 * This pass treats them as a regular character, making the string non-empty. 1015 * Later, they are removed along with the other CTL* characters. 1016 */ 1017 static void 1018 ifsbreakup(char *string, struct arglist *arglist) 1019 { 1020 struct ifsregion *ifsp; 1021 struct strlist *sp; 1022 char *start; 1023 char *p; 1024 char *q; 1025 const char *ifs; 1026 const char *ifsspc; 1027 int had_param_ch = 0; 1028 1029 start = string; 1030 1031 if (ifslastp == NULL) { 1032 /* Return entire argument, IFS doesn't apply to any of it */ 1033 sp = (struct strlist *)stalloc(sizeof *sp); 1034 sp->text = start; 1035 *arglist->lastp = sp; 1036 arglist->lastp = &sp->next; 1037 return; 1038 } 1039 1040 ifs = ifsset() ? ifsval() : " \t\n"; 1041 1042 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1043 p = string + ifsp->begoff; 1044 while (p < string + ifsp->endoff) { 1045 q = p; 1046 if (*p == CTLESC) 1047 p++; 1048 if (ifsp->inquotes) { 1049 /* Only NULs (should be from "$@") end args */ 1050 had_param_ch = 1; 1051 if (*p != 0) { 1052 p++; 1053 continue; 1054 } 1055 ifsspc = NULL; 1056 } else { 1057 if (!strchr(ifs, *p)) { 1058 had_param_ch = 1; 1059 p++; 1060 continue; 1061 } 1062 ifsspc = strchr(" \t\n", *p); 1063 1064 /* Ignore IFS whitespace at start */ 1065 if (q == start && ifsspc != NULL) { 1066 p++; 1067 start = p; 1068 continue; 1069 } 1070 had_param_ch = 0; 1071 } 1072 1073 /* Save this argument... */ 1074 *q = '\0'; 1075 sp = (struct strlist *)stalloc(sizeof *sp); 1076 sp->text = start; 1077 *arglist->lastp = sp; 1078 arglist->lastp = &sp->next; 1079 p++; 1080 1081 if (ifsspc != NULL) { 1082 /* Ignore further trailing IFS whitespace */ 1083 for (; p < string + ifsp->endoff; p++) { 1084 q = p; 1085 if (*p == CTLESC) 1086 p++; 1087 if (strchr(ifs, *p) == NULL) { 1088 p = q; 1089 break; 1090 } 1091 if (strchr(" \t\n", *p) == NULL) { 1092 p++; 1093 break; 1094 } 1095 } 1096 } 1097 start = p; 1098 } 1099 } 1100 1101 /* 1102 * Save anything left as an argument. 1103 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1104 * generating 2 arguments, the second of which is empty. 1105 * Some recent clarification of the Posix spec say that it 1106 * should only generate one.... 1107 */ 1108 if (had_param_ch || *start != 0) { 1109 sp = (struct strlist *)stalloc(sizeof *sp); 1110 sp->text = start; 1111 *arglist->lastp = sp; 1112 arglist->lastp = &sp->next; 1113 } 1114 } 1115 1116 1117 static char expdir[PATH_MAX]; 1118 #define expdir_end (expdir + sizeof(expdir)) 1119 1120 /* 1121 * Perform pathname generation and remove control characters. 1122 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1123 * The results are stored in the list exparg. 1124 */ 1125 static void 1126 expandmeta(struct strlist *str, int flag __unused) 1127 { 1128 char *p; 1129 struct strlist **savelastp; 1130 struct strlist *sp; 1131 char c; 1132 /* TODO - EXP_REDIR */ 1133 1134 while (str) { 1135 if (fflag) 1136 goto nometa; 1137 p = str->text; 1138 for (;;) { /* fast check for meta chars */ 1139 if ((c = *p++) == '\0') 1140 goto nometa; 1141 if (c == '*' || c == '?' || c == '[') 1142 break; 1143 } 1144 savelastp = exparg.lastp; 1145 INTOFF; 1146 expmeta(expdir, str->text); 1147 INTON; 1148 if (exparg.lastp == savelastp) { 1149 /* 1150 * no matches 1151 */ 1152 nometa: 1153 *exparg.lastp = str; 1154 rmescapes(str->text); 1155 exparg.lastp = &str->next; 1156 } else { 1157 *exparg.lastp = NULL; 1158 *savelastp = sp = expsort(*savelastp); 1159 while (sp->next != NULL) 1160 sp = sp->next; 1161 exparg.lastp = &sp->next; 1162 } 1163 str = str->next; 1164 } 1165 } 1166 1167 1168 /* 1169 * Do metacharacter (i.e. *, ?, [...]) expansion. 1170 */ 1171 1172 static void 1173 expmeta(char *enddir, char *name) 1174 { 1175 char *p; 1176 char *q; 1177 char *start; 1178 char *endname; 1179 int metaflag; 1180 struct stat statb; 1181 DIR *dirp; 1182 struct dirent *dp; 1183 int atend; 1184 int matchdot; 1185 int esc; 1186 1187 metaflag = 0; 1188 start = name; 1189 for (p = name; esc = 0, *p; p += esc + 1) { 1190 if (*p == '*' || *p == '?') 1191 metaflag = 1; 1192 else if (*p == '[') { 1193 q = p + 1; 1194 if (*q == '!' || *q == '^') 1195 q++; 1196 for (;;) { 1197 while (*q == CTLQUOTEMARK) 1198 q++; 1199 if (*q == CTLESC) 1200 q++; 1201 if (*q == '/' || *q == '\0') 1202 break; 1203 if (*++q == ']') { 1204 metaflag = 1; 1205 break; 1206 } 1207 } 1208 } else if (*p == '\0') 1209 break; 1210 else if (*p == CTLQUOTEMARK) 1211 continue; 1212 else { 1213 if (*p == CTLESC) 1214 esc++; 1215 if (p[esc] == '/') { 1216 if (metaflag) 1217 break; 1218 start = p + esc + 1; 1219 } 1220 } 1221 } 1222 if (metaflag == 0) { /* we've reached the end of the file name */ 1223 if (enddir != expdir) 1224 metaflag++; 1225 for (p = name ; ; p++) { 1226 if (*p == CTLQUOTEMARK) 1227 continue; 1228 if (*p == CTLESC) 1229 p++; 1230 *enddir++ = *p; 1231 if (*p == '\0') 1232 break; 1233 if (enddir == expdir_end) 1234 return; 1235 } 1236 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1237 addfname(expdir); 1238 return; 1239 } 1240 endname = p; 1241 if (start != name) { 1242 p = name; 1243 while (p < start) { 1244 while (*p == CTLQUOTEMARK) 1245 p++; 1246 if (*p == CTLESC) 1247 p++; 1248 *enddir++ = *p++; 1249 if (enddir == expdir_end) 1250 return; 1251 } 1252 } 1253 if (enddir == expdir) { 1254 p = "."; 1255 } else if (enddir == expdir + 1 && *expdir == '/') { 1256 p = "/"; 1257 } else { 1258 p = expdir; 1259 enddir[-1] = '\0'; 1260 } 1261 if ((dirp = opendir(p)) == NULL) 1262 return; 1263 if (enddir != expdir) 1264 enddir[-1] = '/'; 1265 if (*endname == 0) { 1266 atend = 1; 1267 } else { 1268 atend = 0; 1269 *endname = '\0'; 1270 endname += esc + 1; 1271 } 1272 matchdot = 0; 1273 p = start; 1274 while (*p == CTLQUOTEMARK) 1275 p++; 1276 if (*p == CTLESC) 1277 p++; 1278 if (*p == '.') 1279 matchdot++; 1280 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1281 if (dp->d_name[0] == '.' && ! matchdot) 1282 continue; 1283 if (patmatch(start, dp->d_name, 0)) { 1284 if (enddir + dp->d_namlen + 1 > expdir_end) 1285 continue; 1286 memcpy(enddir, dp->d_name, dp->d_namlen + 1); 1287 if (atend) 1288 addfname(expdir); 1289 else { 1290 if (enddir + dp->d_namlen + 2 > expdir_end) 1291 continue; 1292 enddir[dp->d_namlen] = '/'; 1293 enddir[dp->d_namlen + 1] = '\0'; 1294 expmeta(enddir + dp->d_namlen + 1, endname); 1295 } 1296 } 1297 } 1298 closedir(dirp); 1299 if (! atend) 1300 endname[-esc - 1] = esc ? CTLESC : '/'; 1301 } 1302 1303 1304 /* 1305 * Add a file name to the list. 1306 */ 1307 1308 static void 1309 addfname(char *name) 1310 { 1311 char *p; 1312 struct strlist *sp; 1313 1314 p = stalloc(strlen(name) + 1); 1315 scopy(name, p); 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 * Returns true if the pattern matches the string. 1403 */ 1404 1405 int 1406 patmatch(const char *pattern, const char *string, int squoted) 1407 { 1408 const char *p, *q; 1409 char c; 1410 wchar_t wc, wc2; 1411 1412 p = pattern; 1413 q = string; 1414 for (;;) { 1415 switch (c = *p++) { 1416 case '\0': 1417 goto breakloop; 1418 case CTLESC: 1419 if (squoted && *q == CTLESC) 1420 q++; 1421 if (*q++ != *p++) 1422 return 0; 1423 break; 1424 case CTLQUOTEMARK: 1425 continue; 1426 case '?': 1427 if (squoted && *q == CTLESC) 1428 q++; 1429 if (localeisutf8) 1430 wc = get_wc(&q); 1431 else 1432 wc = *q++; 1433 if (wc == '\0') 1434 return 0; 1435 break; 1436 case '*': 1437 c = *p; 1438 while (c == CTLQUOTEMARK || c == '*') 1439 c = *++p; 1440 if (c != CTLESC && c != CTLQUOTEMARK && 1441 c != '?' && c != '*' && c != '[') { 1442 while (*q != c) { 1443 if (squoted && *q == CTLESC && 1444 q[1] == c) 1445 break; 1446 if (*q == '\0') 1447 return 0; 1448 if (squoted && *q == CTLESC) 1449 q++; 1450 q++; 1451 } 1452 } 1453 do { 1454 if (patmatch(p, q, squoted)) 1455 return 1; 1456 if (squoted && *q == CTLESC) 1457 q++; 1458 } while (*q++ != '\0'); 1459 return 0; 1460 case '[': { 1461 const char *endp; 1462 int invert, found; 1463 wchar_t chr; 1464 1465 endp = p; 1466 if (*endp == '!' || *endp == '^') 1467 endp++; 1468 for (;;) { 1469 while (*endp == CTLQUOTEMARK) 1470 endp++; 1471 if (*endp == '\0') 1472 goto dft; /* no matching ] */ 1473 if (*endp == CTLESC) 1474 endp++; 1475 if (*++endp == ']') 1476 break; 1477 } 1478 invert = 0; 1479 if (*p == '!' || *p == '^') { 1480 invert++; 1481 p++; 1482 } 1483 found = 0; 1484 if (squoted && *q == CTLESC) 1485 q++; 1486 if (localeisutf8) 1487 chr = get_wc(&q); 1488 else 1489 chr = *q++; 1490 if (chr == '\0') 1491 return 0; 1492 c = *p++; 1493 do { 1494 if (c == CTLQUOTEMARK) 1495 continue; 1496 if (c == CTLESC) 1497 c = *p++; 1498 if (localeisutf8 && c & 0x80) { 1499 p--; 1500 wc = get_wc(&p); 1501 if (wc == 0) /* bad utf-8 */ 1502 return 0; 1503 } else 1504 wc = c; 1505 if (*p == '-' && p[1] != ']') { 1506 p++; 1507 while (*p == CTLQUOTEMARK) 1508 p++; 1509 if (*p == CTLESC) 1510 p++; 1511 if (localeisutf8) { 1512 wc2 = get_wc(&p); 1513 if (wc2 == 0) /* bad utf-8 */ 1514 return 0; 1515 } else 1516 wc2 = *p++; 1517 if ( collate_range_cmp(chr, wc) >= 0 1518 && collate_range_cmp(chr, wc2) <= 0 1519 ) 1520 found = 1; 1521 } else { 1522 if (chr == wc) 1523 found = 1; 1524 } 1525 } while ((c = *p++) != ']'); 1526 if (found == invert) 1527 return 0; 1528 break; 1529 } 1530 dft: default: 1531 if (squoted && *q == CTLESC) 1532 q++; 1533 if (*q++ != c) 1534 return 0; 1535 break; 1536 } 1537 } 1538 breakloop: 1539 if (*q != '\0') 1540 return 0; 1541 return 1; 1542 } 1543 1544 1545 1546 /* 1547 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1548 */ 1549 1550 void 1551 rmescapes(char *str) 1552 { 1553 char *p, *q; 1554 1555 p = str; 1556 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1557 if (*p++ == '\0') 1558 return; 1559 } 1560 q = p; 1561 while (*p) { 1562 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1563 p++; 1564 continue; 1565 } 1566 if (*p == CTLESC) 1567 p++; 1568 *q++ = *p++; 1569 } 1570 *q = '\0'; 1571 } 1572 1573 1574 1575 /* 1576 * See if a pattern matches in a case statement. 1577 */ 1578 1579 int 1580 casematch(union node *pattern, const char *val) 1581 { 1582 struct stackmark smark; 1583 int result; 1584 char *p; 1585 1586 setstackmark(&smark); 1587 argbackq = pattern->narg.backquote; 1588 STARTSTACKSTR(expdest); 1589 ifslastp = NULL; 1590 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1591 STPUTC('\0', expdest); 1592 p = grabstackstr(expdest); 1593 result = patmatch(p, val, 0); 1594 popstackmark(&smark); 1595 return result; 1596 } 1597 1598 /* 1599 * Our own itoa(). 1600 */ 1601 1602 static char * 1603 cvtnum(int num, char *buf) 1604 { 1605 char temp[32]; 1606 int neg = num < 0; 1607 char *p = temp + 31; 1608 1609 temp[31] = '\0'; 1610 1611 do { 1612 *--p = num % 10 + '0'; 1613 } while ((num /= 10) != 0); 1614 1615 if (neg) 1616 *--p = '-'; 1617 1618 STPUTS(p, buf); 1619 return buf; 1620 } 1621 1622 /* 1623 * Check statically if expanding a string may have side effects. 1624 */ 1625 int 1626 expandhassideeffects(const char *p) 1627 { 1628 int c; 1629 int arinest; 1630 1631 arinest = 0; 1632 while ((c = *p++) != '\0') { 1633 switch (c) { 1634 case CTLESC: 1635 p++; 1636 break; 1637 case CTLVAR: 1638 c = *p++; 1639 /* Expanding $! sets the job to remembered. */ 1640 if (*p == '!') 1641 return 1; 1642 if ((c & VSTYPE) == VSASSIGN) 1643 return 1; 1644 /* 1645 * If we are in arithmetic, the parameter may contain 1646 * '=' which may cause side effects. Exceptions are 1647 * the length of a parameter and $$, $# and $? which 1648 * are always numeric. 1649 */ 1650 if ((c & VSTYPE) == VSLENGTH) { 1651 while (*p != '=') 1652 p++; 1653 p++; 1654 break; 1655 } 1656 if ((*p == '$' || *p == '#' || *p == '?') && 1657 p[1] == '=') { 1658 p += 2; 1659 break; 1660 } 1661 if (arinest > 0) 1662 return 1; 1663 break; 1664 case CTLBACKQ: 1665 case CTLBACKQ | CTLQUOTE: 1666 if (arinest > 0) 1667 return 1; 1668 break; 1669 case CTLARI: 1670 arinest++; 1671 break; 1672 case CTLENDARI: 1673 arinest--; 1674 break; 1675 case '=': 1676 if (*p == '=') { 1677 /* Allow '==' operator. */ 1678 p++; 1679 continue; 1680 } 1681 if (arinest > 0) 1682 return 1; 1683 break; 1684 case '!': case '<': case '>': 1685 /* Allow '!=', '<=', '>=' operators. */ 1686 if (*p == '=') 1687 p++; 1688 break; 1689 } 1690 } 1691 return 0; 1692 } 1693 1694 /* 1695 * Do most of the work for wordexp(3). 1696 */ 1697 1698 int 1699 wordexpcmd(int argc, char **argv) 1700 { 1701 size_t len; 1702 int i; 1703 1704 out1fmt("%08x", argc - 1); 1705 for (i = 1, len = 0; i < argc; i++) 1706 len += strlen(argv[i]); 1707 out1fmt("%08x", (int)len); 1708 for (i = 1; i < argc; i++) 1709 outbin(argv[i], strlen(argv[i]) + 1, out1); 1710 return (0); 1711 } 1712