1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/types.h> 42 #include <sys/time.h> 43 #include <sys/stat.h> 44 #include <errno.h> 45 #include <dirent.h> 46 #include <unistd.h> 47 #include <pwd.h> 48 #include <stdlib.h> 49 #include <limits.h> 50 #include <stdio.h> 51 #include <string.h> 52 53 /* 54 * Routines to expand arguments to commands. We have to deal with 55 * backquotes, shell variables, and file metacharacters. 56 */ 57 58 #include "shell.h" 59 #include "main.h" 60 #include "nodes.h" 61 #include "eval.h" 62 #include "expand.h" 63 #include "syntax.h" 64 #include "parser.h" 65 #include "jobs.h" 66 #include "options.h" 67 #include "var.h" 68 #include "input.h" 69 #include "output.h" 70 #include "memalloc.h" 71 #include "error.h" 72 #include "mystring.h" 73 #include "arith.h" 74 #include "show.h" 75 76 /* 77 * Structure specifying which parts of the string should be searched 78 * for IFS characters. 79 */ 80 81 struct ifsregion { 82 struct ifsregion *next; /* next region in list */ 83 int begoff; /* offset of start of region */ 84 int endoff; /* offset of end of region */ 85 int nulonly; /* search for nul bytes only */ 86 }; 87 88 89 STATIC char *expdest; /* output of current string */ 90 STATIC struct nodelist *argbackq; /* list of back quote expressions */ 91 STATIC struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 92 STATIC struct ifsregion *ifslastp; /* last struct in list */ 93 STATIC struct arglist exparg; /* holds expanded arg list */ 94 95 STATIC void argstr(char *, int); 96 STATIC char *exptilde(char *, int); 97 STATIC void expbackq(union node *, int, int); 98 STATIC int subevalvar(char *, char *, int, int, int, int); 99 STATIC char *evalvar(char *, int); 100 STATIC int varisset(char *, int); 101 STATIC void varvalue(char *, int, int, int); 102 STATIC void recordregion(int, int, int); 103 STATIC void removerecordregions(int); 104 STATIC void ifsbreakup(char *, struct arglist *); 105 STATIC void expandmeta(struct strlist *, int); 106 STATIC void expmeta(char *, char *); 107 STATIC void addfname(char *); 108 STATIC struct strlist *expsort(struct strlist *); 109 STATIC struct strlist *msort(struct strlist *, int); 110 STATIC int pmatch(char *, char *, int); 111 STATIC char *cvtnum(int, char *); 112 STATIC int collate_range_cmp(int, int); 113 114 STATIC int 115 collate_range_cmp(int c1, int c2) 116 { 117 static char s1[2], s2[2]; 118 119 s1[0] = c1; 120 s2[0] = c2; 121 return (strcoll(s1, s2)); 122 } 123 124 /* 125 * Expand shell variables and backquotes inside a here document. 126 * union node *arg the document 127 * int fd; where to write the expanded version 128 */ 129 130 void 131 expandhere(union node *arg, int fd) 132 { 133 herefd = fd; 134 expandarg(arg, (struct arglist *)NULL, 0); 135 xwrite(fd, stackblock(), expdest - stackblock()); 136 } 137 138 139 /* 140 * Perform variable substitution and command substitution on an argument, 141 * placing the resulting list of arguments in arglist. If EXP_FULL is true, 142 * perform splitting and file name expansion. When arglist is NULL, perform 143 * here document expansion. 144 */ 145 146 void 147 expandarg(union node *arg, struct arglist *arglist, int flag) 148 { 149 struct strlist *sp; 150 char *p; 151 152 argbackq = arg->narg.backquote; 153 STARTSTACKSTR(expdest); 154 ifsfirst.next = NULL; 155 ifslastp = NULL; 156 argstr(arg->narg.text, flag); 157 if (arglist == NULL) { 158 return; /* here document expanded */ 159 } 160 STPUTC('\0', expdest); 161 p = grabstackstr(expdest); 162 exparg.lastp = &exparg.list; 163 /* 164 * TODO - EXP_REDIR 165 */ 166 if (flag & EXP_FULL) { 167 ifsbreakup(p, &exparg); 168 *exparg.lastp = NULL; 169 exparg.lastp = &exparg.list; 170 expandmeta(exparg.list, flag); 171 } else { 172 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 173 rmescapes(p); 174 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 175 sp->text = p; 176 *exparg.lastp = sp; 177 exparg.lastp = &sp->next; 178 } 179 while (ifsfirst.next != NULL) { 180 struct ifsregion *ifsp; 181 INTOFF; 182 ifsp = ifsfirst.next->next; 183 ckfree(ifsfirst.next); 184 ifsfirst.next = ifsp; 185 INTON; 186 } 187 *exparg.lastp = NULL; 188 if (exparg.list) { 189 *arglist->lastp = exparg.list; 190 arglist->lastp = exparg.lastp; 191 } 192 } 193 194 195 196 /* 197 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 198 * characters to allow for further processing. Otherwise treat 199 * $@ like $* since no splitting will be performed. 200 */ 201 202 STATIC void 203 argstr(char *p, int flag) 204 { 205 char c; 206 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 207 int firsteq = 1; 208 209 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 210 p = exptilde(p, flag); 211 for (;;) { 212 switch (c = *p++) { 213 case '\0': 214 case CTLENDVAR: /* ??? */ 215 goto breakloop; 216 case CTLQUOTEMARK: 217 /* "$@" syntax adherence hack */ 218 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 219 break; 220 if ((flag & EXP_FULL) != 0) 221 STPUTC(c, expdest); 222 break; 223 case CTLESC: 224 if (quotes) 225 STPUTC(c, expdest); 226 c = *p++; 227 STPUTC(c, expdest); 228 break; 229 case CTLVAR: 230 p = evalvar(p, flag); 231 break; 232 case CTLBACKQ: 233 case CTLBACKQ|CTLQUOTE: 234 expbackq(argbackq->n, c & CTLQUOTE, flag); 235 argbackq = argbackq->next; 236 break; 237 case CTLENDARI: 238 expari(flag); 239 break; 240 case ':': 241 case '=': 242 /* 243 * sort of a hack - expand tildes in variable 244 * assignments (after the first '=' and after ':'s). 245 */ 246 STPUTC(c, expdest); 247 if (flag & EXP_VARTILDE && *p == '~') { 248 if (c == '=') { 249 if (firsteq) 250 firsteq = 0; 251 else 252 break; 253 } 254 p = exptilde(p, flag); 255 } 256 break; 257 default: 258 STPUTC(c, expdest); 259 } 260 } 261 breakloop:; 262 } 263 264 STATIC char * 265 exptilde(char *p, int flag) 266 { 267 char c, *startp = p; 268 struct passwd *pw; 269 char *home; 270 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 271 272 while ((c = *p) != '\0') { 273 switch(c) { 274 case CTLESC: 275 return (startp); 276 case CTLQUOTEMARK: 277 return (startp); 278 case ':': 279 if (flag & EXP_VARTILDE) 280 goto done; 281 break; 282 case '/': 283 goto done; 284 } 285 p++; 286 } 287 done: 288 *p = '\0'; 289 if (*(startp+1) == '\0') { 290 if ((home = lookupvar("HOME")) == NULL) 291 goto lose; 292 } else { 293 if ((pw = getpwnam(startp+1)) == NULL) 294 goto lose; 295 home = pw->pw_dir; 296 } 297 if (*home == '\0') 298 goto lose; 299 *p = c; 300 while ((c = *home++) != '\0') { 301 if (quotes && SQSYNTAX[(int)c] == CCTL) 302 STPUTC(CTLESC, expdest); 303 STPUTC(c, expdest); 304 } 305 return (p); 306 lose: 307 *p = c; 308 return (startp); 309 } 310 311 312 STATIC void 313 removerecordregions(int endoff) 314 { 315 if (ifslastp == NULL) 316 return; 317 318 if (ifsfirst.endoff > endoff) { 319 while (ifsfirst.next != NULL) { 320 struct ifsregion *ifsp; 321 INTOFF; 322 ifsp = ifsfirst.next->next; 323 ckfree(ifsfirst.next); 324 ifsfirst.next = ifsp; 325 INTON; 326 } 327 if (ifsfirst.begoff > endoff) 328 ifslastp = NULL; 329 else { 330 ifslastp = &ifsfirst; 331 ifsfirst.endoff = endoff; 332 } 333 return; 334 } 335 336 ifslastp = &ifsfirst; 337 while (ifslastp->next && ifslastp->next->begoff < endoff) 338 ifslastp=ifslastp->next; 339 while (ifslastp->next != NULL) { 340 struct ifsregion *ifsp; 341 INTOFF; 342 ifsp = ifslastp->next->next; 343 ckfree(ifslastp->next); 344 ifslastp->next = ifsp; 345 INTON; 346 } 347 if (ifslastp->endoff > endoff) 348 ifslastp->endoff = endoff; 349 } 350 351 /* 352 * Expand arithmetic expression. Backup to start of expression, 353 * evaluate, place result in (backed up) result, adjust string position. 354 */ 355 void 356 expari(int flag) 357 { 358 char *p, *start; 359 int result; 360 int begoff; 361 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 362 int quoted; 363 364 365 /* 366 * This routine is slightly over-complicated for 367 * efficiency. First we make sure there is 368 * enough space for the result, which may be bigger 369 * than the expression if we add exponentiation. Next we 370 * scan backwards looking for the start of arithmetic. If the 371 * next previous character is a CTLESC character, then we 372 * have to rescan starting from the beginning since CTLESC 373 * characters have to be processed left to right. 374 */ 375 #if INT_MAX / 1000000000 >= 10 || INT_MIN / 1000000000 <= -10 376 #error "integers with more than 10 digits are not supported" 377 #endif 378 CHECKSTRSPACE(12 - 2, expdest); 379 USTPUTC('\0', expdest); 380 start = stackblock(); 381 p = expdest - 2; 382 while (p >= start && *p != CTLARI) 383 --p; 384 if (p < start || *p != CTLARI) 385 error("missing CTLARI (shouldn't happen)"); 386 if (p > start && *(p - 1) == CTLESC) 387 for (p = start; *p != CTLARI; p++) 388 if (*p == CTLESC) 389 p++; 390 391 if (p[1] == '"') 392 quoted=1; 393 else 394 quoted=0; 395 begoff = p - start; 396 removerecordregions(begoff); 397 if (quotes) 398 rmescapes(p+2); 399 result = arith(p+2); 400 fmtstr(p, 12, "%d", result); 401 while (*p++) 402 ; 403 if (quoted == 0) 404 recordregion(begoff, p - 1 - start, 0); 405 result = expdest - p + 1; 406 STADJUST(-result, expdest); 407 } 408 409 410 /* 411 * Expand stuff in backwards quotes. 412 */ 413 414 STATIC void 415 expbackq(union node *cmd, int quoted, int flag) 416 { 417 struct backcmd in; 418 int i; 419 char buf[128]; 420 char *p; 421 char *dest = expdest; 422 struct ifsregion saveifs, *savelastp; 423 struct nodelist *saveargbackq; 424 char lastc; 425 int startloc = dest - stackblock(); 426 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 427 int saveherefd; 428 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 429 int nnl; 430 431 INTOFF; 432 saveifs = ifsfirst; 433 savelastp = ifslastp; 434 saveargbackq = argbackq; 435 saveherefd = herefd; 436 herefd = -1; 437 p = grabstackstr(dest); 438 evalbackcmd(cmd, &in); 439 ungrabstackstr(p, dest); 440 ifsfirst = saveifs; 441 ifslastp = savelastp; 442 argbackq = saveargbackq; 443 herefd = saveherefd; 444 445 p = in.buf; 446 lastc = '\0'; 447 nnl = 0; 448 /* Don't copy trailing newlines */ 449 for (;;) { 450 if (--in.nleft < 0) { 451 if (in.fd < 0) 452 break; 453 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 454 TRACE(("expbackq: read returns %d\n", i)); 455 if (i <= 0) 456 break; 457 p = buf; 458 in.nleft = i - 1; 459 } 460 lastc = *p++; 461 if (lastc != '\0') { 462 if (quotes && syntax[(int)lastc] == CCTL) 463 STPUTC(CTLESC, dest); 464 if (lastc == '\n') { 465 nnl++; 466 } else { 467 while (nnl > 0) { 468 nnl--; 469 STPUTC('\n', dest); 470 } 471 STPUTC(lastc, dest); 472 } 473 } 474 } 475 476 if (in.fd >= 0) 477 close(in.fd); 478 if (in.buf) 479 ckfree(in.buf); 480 if (in.jp) 481 exitstatus = waitforjob(in.jp, (int *)NULL); 482 if (quoted == 0) 483 recordregion(startloc, dest - stackblock(), 0); 484 TRACE(("evalbackq: size=%d: \"%.*s\"\n", 485 (dest - stackblock()) - startloc, 486 (dest - stackblock()) - startloc, 487 stackblock() + startloc)); 488 expdest = dest; 489 INTON; 490 } 491 492 493 494 STATIC int 495 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 496 int varflags) 497 { 498 char *startp; 499 char *loc = NULL; 500 char *q; 501 int c = 0; 502 int saveherefd = herefd; 503 struct nodelist *saveargbackq = argbackq; 504 int amount; 505 506 herefd = -1; 507 argstr(p, 0); 508 STACKSTRNUL(expdest); 509 herefd = saveherefd; 510 argbackq = saveargbackq; 511 startp = stackblock() + startloc; 512 if (str == NULL) 513 str = stackblock() + strloc; 514 515 switch (subtype) { 516 case VSASSIGN: 517 setvar(str, startp, 0); 518 amount = startp - expdest; 519 STADJUST(amount, expdest); 520 varflags &= ~VSNUL; 521 if (c != 0) 522 *loc = c; 523 return 1; 524 525 case VSQUESTION: 526 if (*p != CTLENDVAR) { 527 outfmt(&errout, "%s\n", startp); 528 error((char *)NULL); 529 } 530 error("%.*s: parameter %snot set", (int)(p - str - 1), 531 str, (varflags & VSNUL) ? "null or " 532 : nullstr); 533 return 0; 534 535 case VSTRIMLEFT: 536 for (loc = startp; loc < str; loc++) { 537 c = *loc; 538 *loc = '\0'; 539 if (patmatch(str, startp, varflags & VSQUOTE)) { 540 *loc = c; 541 goto recordleft; 542 } 543 *loc = c; 544 if ((varflags & VSQUOTE) && *loc == CTLESC) 545 loc++; 546 } 547 return 0; 548 549 case VSTRIMLEFTMAX: 550 for (loc = str - 1; loc >= startp;) { 551 c = *loc; 552 *loc = '\0'; 553 if (patmatch(str, startp, varflags & VSQUOTE)) { 554 *loc = c; 555 goto recordleft; 556 } 557 *loc = c; 558 loc--; 559 if ((varflags & VSQUOTE) && loc > startp && 560 *(loc - 1) == CTLESC) { 561 for (q = startp; q < loc; q++) 562 if (*q == CTLESC) 563 q++; 564 if (q > loc) 565 loc--; 566 } 567 } 568 return 0; 569 570 case VSTRIMRIGHT: 571 for (loc = str - 1; loc >= startp;) { 572 if (patmatch(str, loc, varflags & VSQUOTE)) { 573 amount = loc - expdest; 574 STADJUST(amount, expdest); 575 return 1; 576 } 577 loc--; 578 if ((varflags & VSQUOTE) && loc > startp && 579 *(loc - 1) == CTLESC) { 580 for (q = startp; q < loc; q++) 581 if (*q == CTLESC) 582 q++; 583 if (q > loc) 584 loc--; 585 } 586 } 587 return 0; 588 589 case VSTRIMRIGHTMAX: 590 for (loc = startp; loc < str - 1; loc++) { 591 if (patmatch(str, loc, varflags & VSQUOTE)) { 592 amount = loc - expdest; 593 STADJUST(amount, expdest); 594 return 1; 595 } 596 if ((varflags & VSQUOTE) && *loc == CTLESC) 597 loc++; 598 } 599 return 0; 600 601 602 default: 603 abort(); 604 } 605 606 recordleft: 607 amount = ((str - 1) - (loc - startp)) - expdest; 608 STADJUST(amount, expdest); 609 while (loc != str - 1) 610 *startp++ = *loc++; 611 return 1; 612 } 613 614 615 /* 616 * Expand a variable, and return a pointer to the next character in the 617 * input string. 618 */ 619 620 STATIC char * 621 evalvar(char *p, int flag) 622 { 623 int subtype; 624 int varflags; 625 char *var; 626 char *val; 627 int patloc; 628 int c; 629 int set; 630 int special; 631 int startloc; 632 int varlen; 633 int easy; 634 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 635 636 varflags = (unsigned char)*p++; 637 subtype = varflags & VSTYPE; 638 var = p; 639 special = 0; 640 if (! is_name(*p)) 641 special = 1; 642 p = strchr(p, '=') + 1; 643 again: /* jump here after setting a variable with ${var=text} */ 644 if (special) { 645 set = varisset(var, varflags & VSNUL); 646 val = NULL; 647 } else { 648 val = bltinlookup(var, 1); 649 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 650 val = NULL; 651 set = 0; 652 } else 653 set = 1; 654 } 655 varlen = 0; 656 startloc = expdest - stackblock(); 657 if (!set && uflag) { 658 switch (subtype) { 659 case VSNORMAL: 660 case VSTRIMLEFT: 661 case VSTRIMLEFTMAX: 662 case VSTRIMRIGHT: 663 case VSTRIMRIGHTMAX: 664 case VSLENGTH: 665 error("%.*s: parameter not set", (int)(p - var - 1), 666 var); 667 } 668 } 669 if (set && subtype != VSPLUS) { 670 /* insert the value of the variable */ 671 if (special) { 672 varvalue(var, varflags & VSQUOTE, subtype, flag); 673 if (subtype == VSLENGTH) { 674 varlen = expdest - stackblock() - startloc; 675 STADJUST(-varlen, expdest); 676 } 677 } else { 678 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 679 : BASESYNTAX; 680 681 if (subtype == VSLENGTH) { 682 for (;*val; val++) 683 varlen++; 684 } 685 else { 686 while (*val) { 687 if (quotes && 688 syntax[(int)*val] == CCTL) 689 STPUTC(CTLESC, expdest); 690 STPUTC(*val++, expdest); 691 } 692 693 } 694 } 695 } 696 697 if (subtype == VSPLUS) 698 set = ! set; 699 700 easy = ((varflags & VSQUOTE) == 0 || 701 (*var == '@' && shellparam.nparam != 1)); 702 703 704 switch (subtype) { 705 case VSLENGTH: 706 expdest = cvtnum(varlen, expdest); 707 goto record; 708 709 case VSNORMAL: 710 if (!easy) 711 break; 712 record: 713 recordregion(startloc, expdest - stackblock(), 714 varflags & VSQUOTE); 715 break; 716 717 case VSPLUS: 718 case VSMINUS: 719 if (!set) { 720 argstr(p, flag); 721 break; 722 } 723 if (easy) 724 goto record; 725 break; 726 727 case VSTRIMLEFT: 728 case VSTRIMLEFTMAX: 729 case VSTRIMRIGHT: 730 case VSTRIMRIGHTMAX: 731 if (!set) 732 break; 733 /* 734 * Terminate the string and start recording the pattern 735 * right after it 736 */ 737 STPUTC('\0', expdest); 738 patloc = expdest - stackblock(); 739 if (subevalvar(p, NULL, patloc, subtype, 740 startloc, varflags) == 0) { 741 int amount = (expdest - stackblock() - patloc) + 1; 742 STADJUST(-amount, expdest); 743 } 744 /* Remove any recorded regions beyond start of variable */ 745 removerecordregions(startloc); 746 goto record; 747 748 case VSASSIGN: 749 case VSQUESTION: 750 if (!set) { 751 if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 752 varflags &= ~VSNUL; 753 /* 754 * Remove any recorded regions beyond 755 * start of variable 756 */ 757 removerecordregions(startloc); 758 goto again; 759 } 760 break; 761 } 762 if (easy) 763 goto record; 764 break; 765 766 case VSERROR: 767 c = p - var - 1; 768 error("${%.*s%s}: Bad substitution", c, var, 769 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 770 771 default: 772 abort(); 773 } 774 775 if (subtype != VSNORMAL) { /* skip to end of alternative */ 776 int nesting = 1; 777 for (;;) { 778 if ((c = *p++) == CTLESC) 779 p++; 780 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 781 if (set) 782 argbackq = argbackq->next; 783 } else if (c == CTLVAR) { 784 if ((*p++ & VSTYPE) != VSNORMAL) 785 nesting++; 786 } else if (c == CTLENDVAR) { 787 if (--nesting == 0) 788 break; 789 } 790 } 791 } 792 return p; 793 } 794 795 796 797 /* 798 * Test whether a specialized variable is set. 799 */ 800 801 STATIC int 802 varisset(char *name, int nulok) 803 { 804 805 if (*name == '!') 806 return backgndpid != -1; 807 else if (*name == '@' || *name == '*') { 808 if (*shellparam.p == NULL) 809 return 0; 810 811 if (nulok) { 812 char **av; 813 814 for (av = shellparam.p; *av; av++) 815 if (**av != '\0') 816 return 1; 817 return 0; 818 } 819 } else if (is_digit(*name)) { 820 char *ap; 821 int num = atoi(name); 822 823 if (num > shellparam.nparam) 824 return 0; 825 826 if (num == 0) 827 ap = arg0; 828 else 829 ap = shellparam.p[num - 1]; 830 831 if (nulok && (ap == NULL || *ap == '\0')) 832 return 0; 833 } 834 return 1; 835 } 836 837 838 839 /* 840 * Add the value of a specialized variable to the stack string. 841 */ 842 843 STATIC void 844 varvalue(char *name, int quoted, int subtype, int flag) 845 { 846 int num; 847 char *p; 848 int i; 849 extern int oexitstatus; 850 char sep; 851 char **ap; 852 char const *syntax; 853 854 #define STRTODEST(p) \ 855 do {\ 856 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) { \ 857 syntax = quoted? DQSYNTAX : BASESYNTAX; \ 858 while (*p) { \ 859 if (syntax[(int)*p] == CCTL) \ 860 STPUTC(CTLESC, expdest); \ 861 STPUTC(*p++, expdest); \ 862 } \ 863 } else \ 864 while (*p) \ 865 STPUTC(*p++, expdest); \ 866 } while (0) 867 868 869 switch (*name) { 870 case '$': 871 num = rootpid; 872 goto numvar; 873 case '?': 874 num = oexitstatus; 875 goto numvar; 876 case '#': 877 num = shellparam.nparam; 878 goto numvar; 879 case '!': 880 num = backgndpid; 881 numvar: 882 expdest = cvtnum(num, expdest); 883 break; 884 case '-': 885 for (i = 0 ; i < NOPTS ; i++) { 886 if (optlist[i].val) 887 STPUTC(optlist[i].letter, expdest); 888 } 889 break; 890 case '@': 891 if (flag & EXP_FULL && quoted) { 892 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 893 STRTODEST(p); 894 if (*ap) 895 STPUTC('\0', expdest); 896 } 897 break; 898 } 899 /* FALLTHROUGH */ 900 case '*': 901 if (ifsset()) 902 sep = ifsval()[0]; 903 else 904 sep = ' '; 905 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 906 STRTODEST(p); 907 if (*ap && sep) 908 STPUTC(sep, expdest); 909 } 910 break; 911 case '0': 912 p = arg0; 913 STRTODEST(p); 914 break; 915 default: 916 if (is_digit(*name)) { 917 num = atoi(name); 918 if (num > 0 && num <= shellparam.nparam) { 919 p = shellparam.p[num - 1]; 920 STRTODEST(p); 921 } 922 } 923 break; 924 } 925 } 926 927 928 929 /* 930 * Record the the fact that we have to scan this region of the 931 * string for IFS characters. 932 */ 933 934 STATIC void 935 recordregion(int start, int end, int nulonly) 936 { 937 struct ifsregion *ifsp; 938 939 if (ifslastp == NULL) { 940 ifsp = &ifsfirst; 941 } else { 942 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 943 ifslastp->next = ifsp; 944 } 945 ifslastp = ifsp; 946 ifslastp->next = NULL; 947 ifslastp->begoff = start; 948 ifslastp->endoff = end; 949 ifslastp->nulonly = nulonly; 950 } 951 952 953 954 /* 955 * Break the argument string into pieces based upon IFS and add the 956 * strings to the argument list. The regions of the string to be 957 * searched for IFS characters have been stored by recordregion. 958 */ 959 STATIC void 960 ifsbreakup(char *string, struct arglist *arglist) 961 { 962 struct ifsregion *ifsp; 963 struct strlist *sp; 964 char *start; 965 char *p; 966 char *q; 967 char *ifs; 968 int ifsspc; 969 int nulonly; 970 971 972 start = string; 973 ifsspc = 0; 974 nulonly = 0; 975 if (ifslastp != NULL) { 976 ifsp = &ifsfirst; 977 do { 978 p = string + ifsp->begoff; 979 nulonly = ifsp->nulonly; 980 ifs = nulonly ? nullstr : 981 ( ifsset() ? ifsval() : " \t\n" ); 982 ifsspc = 0; 983 while (p < string + ifsp->endoff) { 984 q = p; 985 if (*p == CTLESC) 986 p++; 987 if (strchr(ifs, *p)) { 988 if (!nulonly) 989 ifsspc = (strchr(" \t\n", *p) != NULL); 990 /* Ignore IFS whitespace at start */ 991 if (q == start && ifsspc) { 992 p++; 993 start = p; 994 continue; 995 } 996 *q = '\0'; 997 sp = (struct strlist *)stalloc(sizeof *sp); 998 sp->text = start; 999 *arglist->lastp = sp; 1000 arglist->lastp = &sp->next; 1001 p++; 1002 if (!nulonly) { 1003 for (;;) { 1004 if (p >= string + ifsp->endoff) { 1005 break; 1006 } 1007 q = p; 1008 if (*p == CTLESC) 1009 p++; 1010 if (strchr(ifs, *p) == NULL ) { 1011 p = q; 1012 break; 1013 } else if (strchr(" \t\n",*p) == NULL) { 1014 if (ifsspc) { 1015 p++; 1016 ifsspc = 0; 1017 } else { 1018 p = q; 1019 break; 1020 } 1021 } else 1022 p++; 1023 } 1024 } 1025 start = p; 1026 } else 1027 p++; 1028 } 1029 } while ((ifsp = ifsp->next) != NULL); 1030 if (*start || (!ifsspc && start > string)) { 1031 sp = (struct strlist *)stalloc(sizeof *sp); 1032 sp->text = start; 1033 *arglist->lastp = sp; 1034 arglist->lastp = &sp->next; 1035 } 1036 } else { 1037 sp = (struct strlist *)stalloc(sizeof *sp); 1038 sp->text = start; 1039 *arglist->lastp = sp; 1040 arglist->lastp = &sp->next; 1041 } 1042 } 1043 1044 1045 1046 /* 1047 * Expand shell metacharacters. At this point, the only control characters 1048 * should be escapes. The results are stored in the list exparg. 1049 */ 1050 1051 STATIC char *expdir; 1052 1053 1054 STATIC void 1055 expandmeta(struct strlist *str, int flag __unused) 1056 { 1057 char *p; 1058 struct strlist **savelastp; 1059 struct strlist *sp; 1060 char c; 1061 /* TODO - EXP_REDIR */ 1062 1063 while (str) { 1064 if (fflag) 1065 goto nometa; 1066 p = str->text; 1067 for (;;) { /* fast check for meta chars */ 1068 if ((c = *p++) == '\0') 1069 goto nometa; 1070 if (c == '*' || c == '?' || c == '[' || c == '!') 1071 break; 1072 } 1073 savelastp = exparg.lastp; 1074 INTOFF; 1075 if (expdir == NULL) { 1076 int i = strlen(str->text); 1077 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ 1078 } 1079 1080 expmeta(expdir, str->text); 1081 ckfree(expdir); 1082 expdir = NULL; 1083 INTON; 1084 if (exparg.lastp == savelastp) { 1085 /* 1086 * no matches 1087 */ 1088 nometa: 1089 *exparg.lastp = str; 1090 rmescapes(str->text); 1091 exparg.lastp = &str->next; 1092 } else { 1093 *exparg.lastp = NULL; 1094 *savelastp = sp = expsort(*savelastp); 1095 while (sp->next != NULL) 1096 sp = sp->next; 1097 exparg.lastp = &sp->next; 1098 } 1099 str = str->next; 1100 } 1101 } 1102 1103 1104 /* 1105 * Do metacharacter (i.e. *, ?, [...]) expansion. 1106 */ 1107 1108 STATIC void 1109 expmeta(char *enddir, char *name) 1110 { 1111 char *p; 1112 char *q; 1113 char *start; 1114 char *endname; 1115 int metaflag; 1116 struct stat statb; 1117 DIR *dirp; 1118 struct dirent *dp; 1119 int atend; 1120 int matchdot; 1121 1122 metaflag = 0; 1123 start = name; 1124 for (p = name ; ; p++) { 1125 if (*p == '*' || *p == '?') 1126 metaflag = 1; 1127 else if (*p == '[') { 1128 q = p + 1; 1129 if (*q == '!' || *q == '^') 1130 q++; 1131 for (;;) { 1132 while (*q == CTLQUOTEMARK) 1133 q++; 1134 if (*q == CTLESC) 1135 q++; 1136 if (*q == '/' || *q == '\0') 1137 break; 1138 if (*++q == ']') { 1139 metaflag = 1; 1140 break; 1141 } 1142 } 1143 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { 1144 metaflag = 1; 1145 } else if (*p == '\0') 1146 break; 1147 else if (*p == CTLQUOTEMARK) 1148 continue; 1149 else if (*p == CTLESC) 1150 p++; 1151 if (*p == '/') { 1152 if (metaflag) 1153 break; 1154 start = p + 1; 1155 } 1156 } 1157 if (metaflag == 0) { /* we've reached the end of the file name */ 1158 if (enddir != expdir) 1159 metaflag++; 1160 for (p = name ; ; p++) { 1161 if (*p == CTLQUOTEMARK) 1162 continue; 1163 if (*p == CTLESC) 1164 p++; 1165 *enddir++ = *p; 1166 if (*p == '\0') 1167 break; 1168 } 1169 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1170 addfname(expdir); 1171 return; 1172 } 1173 endname = p; 1174 if (start != name) { 1175 p = name; 1176 while (p < start) { 1177 while (*p == CTLQUOTEMARK) 1178 p++; 1179 if (*p == CTLESC) 1180 p++; 1181 *enddir++ = *p++; 1182 } 1183 } 1184 if (enddir == expdir) { 1185 p = "."; 1186 } else if (enddir == expdir + 1 && *expdir == '/') { 1187 p = "/"; 1188 } else { 1189 p = expdir; 1190 enddir[-1] = '\0'; 1191 } 1192 if ((dirp = opendir(p)) == NULL) 1193 return; 1194 if (enddir != expdir) 1195 enddir[-1] = '/'; 1196 if (*endname == 0) { 1197 atend = 1; 1198 } else { 1199 atend = 0; 1200 *endname++ = '\0'; 1201 } 1202 matchdot = 0; 1203 p = start; 1204 while (*p == CTLQUOTEMARK) 1205 p++; 1206 if (*p == CTLESC) 1207 p++; 1208 if (*p == '.') 1209 matchdot++; 1210 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1211 if (dp->d_name[0] == '.' && ! matchdot) 1212 continue; 1213 if (patmatch(start, dp->d_name, 0)) { 1214 if (atend) { 1215 scopy(dp->d_name, enddir); 1216 addfname(expdir); 1217 } else { 1218 for (p = enddir, q = dp->d_name; 1219 (*p++ = *q++) != '\0';) 1220 continue; 1221 p[-1] = '/'; 1222 expmeta(p, endname); 1223 } 1224 } 1225 } 1226 closedir(dirp); 1227 if (! atend) 1228 endname[-1] = '/'; 1229 } 1230 1231 1232 /* 1233 * Add a file name to the list. 1234 */ 1235 1236 STATIC void 1237 addfname(char *name) 1238 { 1239 char *p; 1240 struct strlist *sp; 1241 1242 p = stalloc(strlen(name) + 1); 1243 scopy(name, p); 1244 sp = (struct strlist *)stalloc(sizeof *sp); 1245 sp->text = p; 1246 *exparg.lastp = sp; 1247 exparg.lastp = &sp->next; 1248 } 1249 1250 1251 /* 1252 * Sort the results of file name expansion. It calculates the number of 1253 * strings to sort and then calls msort (short for merge sort) to do the 1254 * work. 1255 */ 1256 1257 STATIC struct strlist * 1258 expsort(struct strlist *str) 1259 { 1260 int len; 1261 struct strlist *sp; 1262 1263 len = 0; 1264 for (sp = str ; sp ; sp = sp->next) 1265 len++; 1266 return msort(str, len); 1267 } 1268 1269 1270 STATIC struct strlist * 1271 msort(struct strlist *list, int len) 1272 { 1273 struct strlist *p, *q = NULL; 1274 struct strlist **lpp; 1275 int half; 1276 int n; 1277 1278 if (len <= 1) 1279 return list; 1280 half = len >> 1; 1281 p = list; 1282 for (n = half ; --n >= 0 ; ) { 1283 q = p; 1284 p = p->next; 1285 } 1286 q->next = NULL; /* terminate first half of list */ 1287 q = msort(list, half); /* sort first half of list */ 1288 p = msort(p, len - half); /* sort second half */ 1289 lpp = &list; 1290 for (;;) { 1291 if (strcmp(p->text, q->text) < 0) { 1292 *lpp = p; 1293 lpp = &p->next; 1294 if ((p = *lpp) == NULL) { 1295 *lpp = q; 1296 break; 1297 } 1298 } else { 1299 *lpp = q; 1300 lpp = &q->next; 1301 if ((q = *lpp) == NULL) { 1302 *lpp = p; 1303 break; 1304 } 1305 } 1306 } 1307 return list; 1308 } 1309 1310 1311 1312 /* 1313 * Returns true if the pattern matches the string. 1314 */ 1315 1316 int 1317 patmatch(char *pattern, char *string, int squoted) 1318 { 1319 #ifdef notdef 1320 if (pattern[0] == '!' && pattern[1] == '!') 1321 return 1 - pmatch(pattern + 2, string); 1322 else 1323 #endif 1324 return pmatch(pattern, string, squoted); 1325 } 1326 1327 1328 STATIC int 1329 pmatch(char *pattern, char *string, int squoted) 1330 { 1331 char *p, *q; 1332 char c; 1333 1334 p = pattern; 1335 q = string; 1336 for (;;) { 1337 switch (c = *p++) { 1338 case '\0': 1339 goto breakloop; 1340 case CTLESC: 1341 if (squoted && *q == CTLESC) 1342 q++; 1343 if (*q++ != *p++) 1344 return 0; 1345 break; 1346 case CTLQUOTEMARK: 1347 continue; 1348 case '?': 1349 if (squoted && *q == CTLESC) 1350 q++; 1351 if (*q++ == '\0') 1352 return 0; 1353 break; 1354 case '*': 1355 c = *p; 1356 while (c == CTLQUOTEMARK || c == '*') 1357 c = *++p; 1358 if (c != CTLESC && c != CTLQUOTEMARK && 1359 c != '?' && c != '*' && c != '[') { 1360 while (*q != c) { 1361 if (squoted && *q == CTLESC && 1362 q[1] == c) 1363 break; 1364 if (*q == '\0') 1365 return 0; 1366 if (squoted && *q == CTLESC) 1367 q++; 1368 q++; 1369 } 1370 } 1371 do { 1372 if (pmatch(p, q, squoted)) 1373 return 1; 1374 if (squoted && *q == CTLESC) 1375 q++; 1376 } while (*q++ != '\0'); 1377 return 0; 1378 case '[': { 1379 char *endp; 1380 int invert, found; 1381 char chr; 1382 1383 endp = p; 1384 if (*endp == '!' || *endp == '^') 1385 endp++; 1386 for (;;) { 1387 while (*endp == CTLQUOTEMARK) 1388 endp++; 1389 if (*endp == '\0') 1390 goto dft; /* no matching ] */ 1391 if (*endp == CTLESC) 1392 endp++; 1393 if (*++endp == ']') 1394 break; 1395 } 1396 invert = 0; 1397 if (*p == '!' || *p == '^') { 1398 invert++; 1399 p++; 1400 } 1401 found = 0; 1402 chr = *q++; 1403 if (squoted && chr == CTLESC) 1404 chr = *q++; 1405 if (chr == '\0') 1406 return 0; 1407 c = *p++; 1408 do { 1409 if (c == CTLQUOTEMARK) 1410 continue; 1411 if (c == CTLESC) 1412 c = *p++; 1413 if (*p == '-' && p[1] != ']') { 1414 p++; 1415 while (*p == CTLQUOTEMARK) 1416 p++; 1417 if (*p == CTLESC) 1418 p++; 1419 if ( collate_range_cmp(chr, c) >= 0 1420 && collate_range_cmp(chr, *p) <= 0 1421 ) 1422 found = 1; 1423 p++; 1424 } else { 1425 if (chr == c) 1426 found = 1; 1427 } 1428 } while ((c = *p++) != ']'); 1429 if (found == invert) 1430 return 0; 1431 break; 1432 } 1433 dft: default: 1434 if (squoted && *q == CTLESC) 1435 q++; 1436 if (*q++ != c) 1437 return 0; 1438 break; 1439 } 1440 } 1441 breakloop: 1442 if (*q != '\0') 1443 return 0; 1444 return 1; 1445 } 1446 1447 1448 1449 /* 1450 * Remove any CTLESC characters from a string. 1451 */ 1452 1453 void 1454 rmescapes(char *str) 1455 { 1456 char *p, *q; 1457 1458 p = str; 1459 while (*p != CTLESC && *p != CTLQUOTEMARK) { 1460 if (*p++ == '\0') 1461 return; 1462 } 1463 q = p; 1464 while (*p) { 1465 if (*p == CTLQUOTEMARK) { 1466 p++; 1467 continue; 1468 } 1469 if (*p == CTLESC) 1470 p++; 1471 *q++ = *p++; 1472 } 1473 *q = '\0'; 1474 } 1475 1476 1477 1478 /* 1479 * See if a pattern matches in a case statement. 1480 */ 1481 1482 int 1483 casematch(union node *pattern, char *val) 1484 { 1485 struct stackmark smark; 1486 int result; 1487 char *p; 1488 1489 setstackmark(&smark); 1490 argbackq = pattern->narg.backquote; 1491 STARTSTACKSTR(expdest); 1492 ifslastp = NULL; 1493 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1494 STPUTC('\0', expdest); 1495 p = grabstackstr(expdest); 1496 result = patmatch(p, val, 0); 1497 popstackmark(&smark); 1498 return result; 1499 } 1500 1501 /* 1502 * Our own itoa(). 1503 */ 1504 1505 STATIC char * 1506 cvtnum(int num, char *buf) 1507 { 1508 char temp[32]; 1509 int neg = num < 0; 1510 char *p = temp + 31; 1511 1512 temp[31] = '\0'; 1513 1514 do { 1515 *--p = num % 10 + '0'; 1516 } while ((num /= 10) != 0); 1517 1518 if (neg) 1519 *--p = '-'; 1520 1521 while (*p) 1522 STPUTC(*p++, buf); 1523 return buf; 1524 } 1525 1526 /* 1527 * Do most of the work for wordexp(3). 1528 */ 1529 1530 int 1531 wordexpcmd(int argc, char **argv) 1532 { 1533 size_t len; 1534 int i; 1535 1536 out1fmt("%08x", argc - 1); 1537 for (i = 1, len = 0; i < argc; i++) 1538 len += strlen(argv[i]); 1539 out1fmt("%08x", (int)len); 1540 for (i = 1; i < argc; i++) { 1541 out1str(argv[i]); 1542 out1c('\0'); 1543 } 1544 return (0); 1545 } 1546