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); 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 = *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, flag & EXP_FULL); 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 default: 767 abort(); 768 } 769 770 if (subtype != VSNORMAL) { /* skip to end of alternative */ 771 int nesting = 1; 772 for (;;) { 773 if ((c = *p++) == CTLESC) 774 p++; 775 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 776 if (set) 777 argbackq = argbackq->next; 778 } else if (c == CTLVAR) { 779 if ((*p++ & VSTYPE) != VSNORMAL) 780 nesting++; 781 } else if (c == CTLENDVAR) { 782 if (--nesting == 0) 783 break; 784 } 785 } 786 } 787 return p; 788 } 789 790 791 792 /* 793 * Test whether a specialized variable is set. 794 */ 795 796 STATIC int 797 varisset(char *name, int nulok) 798 { 799 800 if (*name == '!') 801 return backgndpid != -1; 802 else if (*name == '@' || *name == '*') { 803 if (*shellparam.p == NULL) 804 return 0; 805 806 if (nulok) { 807 char **av; 808 809 for (av = shellparam.p; *av; av++) 810 if (**av != '\0') 811 return 1; 812 return 0; 813 } 814 } else if (is_digit(*name)) { 815 char *ap; 816 int num = atoi(name); 817 818 if (num > shellparam.nparam) 819 return 0; 820 821 if (num == 0) 822 ap = arg0; 823 else 824 ap = shellparam.p[num - 1]; 825 826 if (nulok && (ap == NULL || *ap == '\0')) 827 return 0; 828 } 829 return 1; 830 } 831 832 833 834 /* 835 * Add the value of a specialized variable to the stack string. 836 */ 837 838 STATIC void 839 varvalue(char *name, int quoted, int allow_split) 840 { 841 int num; 842 char *p; 843 int i; 844 extern int oexitstatus; 845 char sep; 846 char **ap; 847 char const *syntax; 848 849 #define STRTODEST(p) \ 850 do {\ 851 if (allow_split) { \ 852 syntax = quoted? DQSYNTAX : BASESYNTAX; \ 853 while (*p) { \ 854 if (syntax[(int)*p] == CCTL) \ 855 STPUTC(CTLESC, expdest); \ 856 STPUTC(*p++, expdest); \ 857 } \ 858 } else \ 859 while (*p) \ 860 STPUTC(*p++, expdest); \ 861 } while (0) 862 863 864 switch (*name) { 865 case '$': 866 num = rootpid; 867 goto numvar; 868 case '?': 869 num = oexitstatus; 870 goto numvar; 871 case '#': 872 num = shellparam.nparam; 873 goto numvar; 874 case '!': 875 num = backgndpid; 876 numvar: 877 expdest = cvtnum(num, expdest); 878 break; 879 case '-': 880 for (i = 0 ; i < NOPTS ; i++) { 881 if (optlist[i].val) 882 STPUTC(optlist[i].letter, expdest); 883 } 884 break; 885 case '@': 886 if (allow_split && quoted) { 887 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 888 STRTODEST(p); 889 if (*ap) 890 STPUTC('\0', expdest); 891 } 892 break; 893 } 894 /* FALLTHROUGH */ 895 case '*': 896 if (ifsset()) 897 sep = ifsval()[0]; 898 else 899 sep = ' '; 900 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 901 STRTODEST(p); 902 if (*ap && sep) 903 STPUTC(sep, expdest); 904 } 905 break; 906 case '0': 907 p = arg0; 908 STRTODEST(p); 909 break; 910 default: 911 if (is_digit(*name)) { 912 num = atoi(name); 913 if (num > 0 && num <= shellparam.nparam) { 914 p = shellparam.p[num - 1]; 915 STRTODEST(p); 916 } 917 } 918 break; 919 } 920 } 921 922 923 924 /* 925 * Record the the fact that we have to scan this region of the 926 * string for IFS characters. 927 */ 928 929 STATIC void 930 recordregion(int start, int end, int nulonly) 931 { 932 struct ifsregion *ifsp; 933 934 if (ifslastp == NULL) { 935 ifsp = &ifsfirst; 936 } else { 937 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 938 ifslastp->next = ifsp; 939 } 940 ifslastp = ifsp; 941 ifslastp->next = NULL; 942 ifslastp->begoff = start; 943 ifslastp->endoff = end; 944 ifslastp->nulonly = nulonly; 945 } 946 947 948 949 /* 950 * Break the argument string into pieces based upon IFS and add the 951 * strings to the argument list. The regions of the string to be 952 * searched for IFS characters have been stored by recordregion. 953 */ 954 STATIC void 955 ifsbreakup(char *string, struct arglist *arglist) 956 { 957 struct ifsregion *ifsp; 958 struct strlist *sp; 959 char *start; 960 char *p; 961 char *q; 962 char *ifs; 963 int ifsspc; 964 int nulonly; 965 966 967 start = string; 968 ifsspc = 0; 969 nulonly = 0; 970 if (ifslastp != NULL) { 971 ifsp = &ifsfirst; 972 do { 973 p = string + ifsp->begoff; 974 nulonly = ifsp->nulonly; 975 ifs = nulonly ? nullstr : 976 ( ifsset() ? ifsval() : " \t\n" ); 977 ifsspc = 0; 978 while (p < string + ifsp->endoff) { 979 q = p; 980 if (*p == CTLESC) 981 p++; 982 if (strchr(ifs, *p)) { 983 if (!nulonly) 984 ifsspc = (strchr(" \t\n", *p) != NULL); 985 /* Ignore IFS whitespace at start */ 986 if (q == start && ifsspc) { 987 p++; 988 start = p; 989 continue; 990 } 991 *q = '\0'; 992 sp = (struct strlist *)stalloc(sizeof *sp); 993 sp->text = start; 994 *arglist->lastp = sp; 995 arglist->lastp = &sp->next; 996 p++; 997 if (!nulonly) { 998 for (;;) { 999 if (p >= string + ifsp->endoff) { 1000 break; 1001 } 1002 q = p; 1003 if (*p == CTLESC) 1004 p++; 1005 if (strchr(ifs, *p) == NULL ) { 1006 p = q; 1007 break; 1008 } else if (strchr(" \t\n",*p) == NULL) { 1009 if (ifsspc) { 1010 p++; 1011 ifsspc = 0; 1012 } else { 1013 p = q; 1014 break; 1015 } 1016 } else 1017 p++; 1018 } 1019 } 1020 start = p; 1021 } else 1022 p++; 1023 } 1024 } while ((ifsp = ifsp->next) != NULL); 1025 if (*start || (!ifsspc && start > string)) { 1026 sp = (struct strlist *)stalloc(sizeof *sp); 1027 sp->text = start; 1028 *arglist->lastp = sp; 1029 arglist->lastp = &sp->next; 1030 } 1031 } else { 1032 sp = (struct strlist *)stalloc(sizeof *sp); 1033 sp->text = start; 1034 *arglist->lastp = sp; 1035 arglist->lastp = &sp->next; 1036 } 1037 } 1038 1039 1040 1041 /* 1042 * Expand shell metacharacters. At this point, the only control characters 1043 * should be escapes. The results are stored in the list exparg. 1044 */ 1045 1046 STATIC char *expdir; 1047 1048 1049 STATIC void 1050 expandmeta(struct strlist *str, int flag __unused) 1051 { 1052 char *p; 1053 struct strlist **savelastp; 1054 struct strlist *sp; 1055 char c; 1056 /* TODO - EXP_REDIR */ 1057 1058 while (str) { 1059 if (fflag) 1060 goto nometa; 1061 p = str->text; 1062 for (;;) { /* fast check for meta chars */ 1063 if ((c = *p++) == '\0') 1064 goto nometa; 1065 if (c == '*' || c == '?' || c == '[' || c == '!') 1066 break; 1067 } 1068 savelastp = exparg.lastp; 1069 INTOFF; 1070 if (expdir == NULL) { 1071 int i = strlen(str->text); 1072 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ 1073 } 1074 1075 expmeta(expdir, str->text); 1076 ckfree(expdir); 1077 expdir = NULL; 1078 INTON; 1079 if (exparg.lastp == savelastp) { 1080 /* 1081 * no matches 1082 */ 1083 nometa: 1084 *exparg.lastp = str; 1085 rmescapes(str->text); 1086 exparg.lastp = &str->next; 1087 } else { 1088 *exparg.lastp = NULL; 1089 *savelastp = sp = expsort(*savelastp); 1090 while (sp->next != NULL) 1091 sp = sp->next; 1092 exparg.lastp = &sp->next; 1093 } 1094 str = str->next; 1095 } 1096 } 1097 1098 1099 /* 1100 * Do metacharacter (i.e. *, ?, [...]) expansion. 1101 */ 1102 1103 STATIC void 1104 expmeta(char *enddir, char *name) 1105 { 1106 char *p; 1107 char *q; 1108 char *start; 1109 char *endname; 1110 int metaflag; 1111 struct stat statb; 1112 DIR *dirp; 1113 struct dirent *dp; 1114 int atend; 1115 int matchdot; 1116 1117 metaflag = 0; 1118 start = name; 1119 for (p = name ; ; p++) { 1120 if (*p == '*' || *p == '?') 1121 metaflag = 1; 1122 else if (*p == '[') { 1123 q = p + 1; 1124 if (*q == '!' || *q == '^') 1125 q++; 1126 for (;;) { 1127 while (*q == CTLQUOTEMARK) 1128 q++; 1129 if (*q == CTLESC) 1130 q++; 1131 if (*q == '/' || *q == '\0') 1132 break; 1133 if (*++q == ']') { 1134 metaflag = 1; 1135 break; 1136 } 1137 } 1138 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { 1139 metaflag = 1; 1140 } else if (*p == '\0') 1141 break; 1142 else if (*p == CTLQUOTEMARK) 1143 continue; 1144 else if (*p == CTLESC) 1145 p++; 1146 if (*p == '/') { 1147 if (metaflag) 1148 break; 1149 start = p + 1; 1150 } 1151 } 1152 if (metaflag == 0) { /* we've reached the end of the file name */ 1153 if (enddir != expdir) 1154 metaflag++; 1155 for (p = name ; ; p++) { 1156 if (*p == CTLQUOTEMARK) 1157 continue; 1158 if (*p == CTLESC) 1159 p++; 1160 *enddir++ = *p; 1161 if (*p == '\0') 1162 break; 1163 } 1164 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1165 addfname(expdir); 1166 return; 1167 } 1168 endname = p; 1169 if (start != name) { 1170 p = name; 1171 while (p < start) { 1172 while (*p == CTLQUOTEMARK) 1173 p++; 1174 if (*p == CTLESC) 1175 p++; 1176 *enddir++ = *p++; 1177 } 1178 } 1179 if (enddir == expdir) { 1180 p = "."; 1181 } else if (enddir == expdir + 1 && *expdir == '/') { 1182 p = "/"; 1183 } else { 1184 p = expdir; 1185 enddir[-1] = '\0'; 1186 } 1187 if ((dirp = opendir(p)) == NULL) 1188 return; 1189 if (enddir != expdir) 1190 enddir[-1] = '/'; 1191 if (*endname == 0) { 1192 atend = 1; 1193 } else { 1194 atend = 0; 1195 *endname++ = '\0'; 1196 } 1197 matchdot = 0; 1198 p = start; 1199 while (*p == CTLQUOTEMARK) 1200 p++; 1201 if (*p == CTLESC) 1202 p++; 1203 if (*p == '.') 1204 matchdot++; 1205 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1206 if (dp->d_name[0] == '.' && ! matchdot) 1207 continue; 1208 if (patmatch(start, dp->d_name, 0)) { 1209 if (atend) { 1210 scopy(dp->d_name, enddir); 1211 addfname(expdir); 1212 } else { 1213 for (p = enddir, q = dp->d_name; 1214 (*p++ = *q++) != '\0';) 1215 continue; 1216 p[-1] = '/'; 1217 expmeta(p, endname); 1218 } 1219 } 1220 } 1221 closedir(dirp); 1222 if (! atend) 1223 endname[-1] = '/'; 1224 } 1225 1226 1227 /* 1228 * Add a file name to the list. 1229 */ 1230 1231 STATIC void 1232 addfname(char *name) 1233 { 1234 char *p; 1235 struct strlist *sp; 1236 1237 p = stalloc(strlen(name) + 1); 1238 scopy(name, p); 1239 sp = (struct strlist *)stalloc(sizeof *sp); 1240 sp->text = p; 1241 *exparg.lastp = sp; 1242 exparg.lastp = &sp->next; 1243 } 1244 1245 1246 /* 1247 * Sort the results of file name expansion. It calculates the number of 1248 * strings to sort and then calls msort (short for merge sort) to do the 1249 * work. 1250 */ 1251 1252 STATIC struct strlist * 1253 expsort(struct strlist *str) 1254 { 1255 int len; 1256 struct strlist *sp; 1257 1258 len = 0; 1259 for (sp = str ; sp ; sp = sp->next) 1260 len++; 1261 return msort(str, len); 1262 } 1263 1264 1265 STATIC struct strlist * 1266 msort(struct strlist *list, int len) 1267 { 1268 struct strlist *p, *q = NULL; 1269 struct strlist **lpp; 1270 int half; 1271 int n; 1272 1273 if (len <= 1) 1274 return list; 1275 half = len >> 1; 1276 p = list; 1277 for (n = half ; --n >= 0 ; ) { 1278 q = p; 1279 p = p->next; 1280 } 1281 q->next = NULL; /* terminate first half of list */ 1282 q = msort(list, half); /* sort first half of list */ 1283 p = msort(p, len - half); /* sort second half */ 1284 lpp = &list; 1285 for (;;) { 1286 if (strcmp(p->text, q->text) < 0) { 1287 *lpp = p; 1288 lpp = &p->next; 1289 if ((p = *lpp) == NULL) { 1290 *lpp = q; 1291 break; 1292 } 1293 } else { 1294 *lpp = q; 1295 lpp = &q->next; 1296 if ((q = *lpp) == NULL) { 1297 *lpp = p; 1298 break; 1299 } 1300 } 1301 } 1302 return list; 1303 } 1304 1305 1306 1307 /* 1308 * Returns true if the pattern matches the string. 1309 */ 1310 1311 int 1312 patmatch(char *pattern, char *string, int squoted) 1313 { 1314 #ifdef notdef 1315 if (pattern[0] == '!' && pattern[1] == '!') 1316 return 1 - pmatch(pattern + 2, string); 1317 else 1318 #endif 1319 return pmatch(pattern, string, squoted); 1320 } 1321 1322 1323 STATIC int 1324 pmatch(char *pattern, char *string, int squoted) 1325 { 1326 char *p, *q; 1327 char c; 1328 1329 p = pattern; 1330 q = string; 1331 for (;;) { 1332 switch (c = *p++) { 1333 case '\0': 1334 goto breakloop; 1335 case CTLESC: 1336 if (squoted && *q == CTLESC) 1337 q++; 1338 if (*q++ != *p++) 1339 return 0; 1340 break; 1341 case CTLQUOTEMARK: 1342 continue; 1343 case '?': 1344 if (squoted && *q == CTLESC) 1345 q++; 1346 if (*q++ == '\0') 1347 return 0; 1348 break; 1349 case '*': 1350 c = *p; 1351 while (c == CTLQUOTEMARK || c == '*') 1352 c = *++p; 1353 if (c != CTLESC && c != CTLQUOTEMARK && 1354 c != '?' && c != '*' && c != '[') { 1355 while (*q != c) { 1356 if (squoted && *q == CTLESC && 1357 q[1] == c) 1358 break; 1359 if (*q == '\0') 1360 return 0; 1361 if (squoted && *q == CTLESC) 1362 q++; 1363 q++; 1364 } 1365 } 1366 do { 1367 if (pmatch(p, q, squoted)) 1368 return 1; 1369 if (squoted && *q == CTLESC) 1370 q++; 1371 } while (*q++ != '\0'); 1372 return 0; 1373 case '[': { 1374 char *endp; 1375 int invert, found; 1376 char chr; 1377 1378 endp = p; 1379 if (*endp == '!' || *endp == '^') 1380 endp++; 1381 for (;;) { 1382 while (*endp == CTLQUOTEMARK) 1383 endp++; 1384 if (*endp == '\0') 1385 goto dft; /* no matching ] */ 1386 if (*endp == CTLESC) 1387 endp++; 1388 if (*++endp == ']') 1389 break; 1390 } 1391 invert = 0; 1392 if (*p == '!' || *p == '^') { 1393 invert++; 1394 p++; 1395 } 1396 found = 0; 1397 chr = *q++; 1398 if (squoted && chr == CTLESC) 1399 chr = *q++; 1400 if (chr == '\0') 1401 return 0; 1402 c = *p++; 1403 do { 1404 if (c == CTLQUOTEMARK) 1405 continue; 1406 if (c == CTLESC) 1407 c = *p++; 1408 if (*p == '-' && p[1] != ']') { 1409 p++; 1410 while (*p == CTLQUOTEMARK) 1411 p++; 1412 if (*p == CTLESC) 1413 p++; 1414 if ( collate_range_cmp(chr, c) >= 0 1415 && collate_range_cmp(chr, *p) <= 0 1416 ) 1417 found = 1; 1418 p++; 1419 } else { 1420 if (chr == c) 1421 found = 1; 1422 } 1423 } while ((c = *p++) != ']'); 1424 if (found == invert) 1425 return 0; 1426 break; 1427 } 1428 dft: default: 1429 if (squoted && *q == CTLESC) 1430 q++; 1431 if (*q++ != c) 1432 return 0; 1433 break; 1434 } 1435 } 1436 breakloop: 1437 if (*q != '\0') 1438 return 0; 1439 return 1; 1440 } 1441 1442 1443 1444 /* 1445 * Remove any CTLESC characters from a string. 1446 */ 1447 1448 void 1449 rmescapes(char *str) 1450 { 1451 char *p, *q; 1452 1453 p = str; 1454 while (*p != CTLESC && *p != CTLQUOTEMARK) { 1455 if (*p++ == '\0') 1456 return; 1457 } 1458 q = p; 1459 while (*p) { 1460 if (*p == CTLQUOTEMARK) { 1461 p++; 1462 continue; 1463 } 1464 if (*p == CTLESC) 1465 p++; 1466 *q++ = *p++; 1467 } 1468 *q = '\0'; 1469 } 1470 1471 1472 1473 /* 1474 * See if a pattern matches in a case statement. 1475 */ 1476 1477 int 1478 casematch(union node *pattern, char *val) 1479 { 1480 struct stackmark smark; 1481 int result; 1482 char *p; 1483 1484 setstackmark(&smark); 1485 argbackq = pattern->narg.backquote; 1486 STARTSTACKSTR(expdest); 1487 ifslastp = NULL; 1488 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1489 STPUTC('\0', expdest); 1490 p = grabstackstr(expdest); 1491 result = patmatch(p, val, 0); 1492 popstackmark(&smark); 1493 return result; 1494 } 1495 1496 /* 1497 * Our own itoa(). 1498 */ 1499 1500 STATIC char * 1501 cvtnum(int num, char *buf) 1502 { 1503 char temp[32]; 1504 int neg = num < 0; 1505 char *p = temp + 31; 1506 1507 temp[31] = '\0'; 1508 1509 do { 1510 *--p = num % 10 + '0'; 1511 } while ((num /= 10) != 0); 1512 1513 if (neg) 1514 *--p = '-'; 1515 1516 while (*p) 1517 STPUTC(*p++, buf); 1518 return buf; 1519 } 1520 1521 /* 1522 * Do most of the work for wordexp(3). 1523 */ 1524 1525 int 1526 wordexpcmd(int argc, char **argv) 1527 { 1528 size_t len; 1529 int i; 1530 1531 out1fmt("%08x", argc - 1); 1532 for (i = 1, len = 0; i < argc; i++) 1533 len += strlen(argv[i]); 1534 out1fmt("%08x", (int)len); 1535 for (i = 1; i < argc; i++) { 1536 out1str(argv[i]); 1537 out1c('\0'); 1538 } 1539 return (0); 1540 } 1541