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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 40 #endif 41 #endif /* not lint */ 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/types.h> 46 #include <sys/time.h> 47 #include <sys/stat.h> 48 #include <errno.h> 49 #include <dirent.h> 50 #include <unistd.h> 51 #include <pwd.h> 52 #include <stdlib.h> 53 #include <limits.h> 54 #include <stdio.h> 55 #include <string.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 nulonly; /* 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); 103 STATIC char *evalvar(char *, int); 104 STATIC int varisset(char *, int); 105 STATIC void varvalue(char *, 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 int pmatch(char *, char *, int); 115 STATIC char *cvtnum(int, char *); 116 STATIC int collate_range_cmp(int, int); 117 118 STATIC int 119 collate_range_cmp(int c1, int c2) 120 { 121 static char s1[2], s2[2]; 122 123 s1[0] = c1; 124 s2[0] = c2; 125 return (strcoll(s1, s2)); 126 } 127 128 /* 129 * Expand shell variables and backquotes inside a here document. 130 * union node *arg the document 131 * int fd; where to write the expanded version 132 */ 133 134 void 135 expandhere(union node *arg, int fd) 136 { 137 herefd = fd; 138 expandarg(arg, (struct arglist *)NULL, 0); 139 xwrite(fd, stackblock(), expdest - stackblock()); 140 } 141 142 143 /* 144 * Perform variable substitution and command substitution on an argument, 145 * placing the resulting list of arguments in arglist. If EXP_FULL is true, 146 * perform splitting and file name expansion. When arglist is NULL, perform 147 * here document expansion. 148 */ 149 150 void 151 expandarg(union node *arg, struct arglist *arglist, int flag) 152 { 153 struct strlist *sp; 154 char *p; 155 156 argbackq = arg->narg.backquote; 157 STARTSTACKSTR(expdest); 158 ifsfirst.next = NULL; 159 ifslastp = NULL; 160 argstr(arg->narg.text, flag); 161 if (arglist == NULL) { 162 return; /* here document expanded */ 163 } 164 STPUTC('\0', expdest); 165 p = grabstackstr(expdest); 166 exparg.lastp = &exparg.list; 167 /* 168 * TODO - EXP_REDIR 169 */ 170 if (flag & EXP_FULL) { 171 ifsbreakup(p, &exparg); 172 *exparg.lastp = NULL; 173 exparg.lastp = &exparg.list; 174 expandmeta(exparg.list, flag); 175 } else { 176 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 177 rmescapes(p); 178 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 179 sp->text = p; 180 *exparg.lastp = sp; 181 exparg.lastp = &sp->next; 182 } 183 while (ifsfirst.next != NULL) { 184 struct ifsregion *ifsp; 185 INTOFF; 186 ifsp = ifsfirst.next->next; 187 ckfree(ifsfirst.next); 188 ifsfirst.next = ifsp; 189 INTON; 190 } 191 *exparg.lastp = NULL; 192 if (exparg.list) { 193 *arglist->lastp = exparg.list; 194 arglist->lastp = exparg.lastp; 195 } 196 } 197 198 199 200 /* 201 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 202 * characters to allow for further processing. Otherwise treat 203 * $@ like $* since no splitting will be performed. 204 */ 205 206 STATIC void 207 argstr(char *p, int flag) 208 { 209 char c; 210 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 211 int firsteq = 1; 212 213 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 214 p = exptilde(p, flag); 215 for (;;) { 216 switch (c = *p++) { 217 case '\0': 218 case CTLENDVAR: /* ??? */ 219 goto breakloop; 220 case CTLQUOTEMARK: 221 /* "$@" syntax adherence hack */ 222 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 223 break; 224 if ((flag & EXP_FULL) != 0) 225 STPUTC(c, expdest); 226 break; 227 case CTLESC: 228 if (quotes) 229 STPUTC(c, expdest); 230 c = *p++; 231 STPUTC(c, expdest); 232 break; 233 case CTLVAR: 234 p = evalvar(p, flag); 235 break; 236 case CTLBACKQ: 237 case CTLBACKQ|CTLQUOTE: 238 expbackq(argbackq->n, c & CTLQUOTE, flag); 239 argbackq = argbackq->next; 240 break; 241 case CTLENDARI: 242 expari(flag); 243 break; 244 case ':': 245 case '=': 246 /* 247 * sort of a hack - expand tildes in variable 248 * assignments (after the first '=' and after ':'s). 249 */ 250 STPUTC(c, expdest); 251 if (flag & EXP_VARTILDE && *p == '~') { 252 if (c == '=') { 253 if (firsteq) 254 firsteq = 0; 255 else 256 break; 257 } 258 p = exptilde(p, flag); 259 } 260 break; 261 default: 262 STPUTC(c, expdest); 263 } 264 } 265 breakloop:; 266 } 267 268 STATIC char * 269 exptilde(char *p, int flag) 270 { 271 char c, *startp = p; 272 struct passwd *pw; 273 char *home; 274 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 275 276 while ((c = *p) != '\0') { 277 switch(c) { 278 case CTLESC: 279 return (startp); 280 case CTLQUOTEMARK: 281 return (startp); 282 case ':': 283 if (flag & EXP_VARTILDE) 284 goto done; 285 break; 286 case '/': 287 goto done; 288 } 289 p++; 290 } 291 done: 292 *p = '\0'; 293 if (*(startp+1) == '\0') { 294 if ((home = lookupvar("HOME")) == NULL) 295 goto lose; 296 } else { 297 if ((pw = getpwnam(startp+1)) == NULL) 298 goto lose; 299 home = pw->pw_dir; 300 } 301 if (*home == '\0') 302 goto lose; 303 *p = c; 304 while ((c = *home++) != '\0') { 305 if (quotes && SQSYNTAX[(int)c] == CCTL) 306 STPUTC(CTLESC, expdest); 307 STPUTC(c, expdest); 308 } 309 return (p); 310 lose: 311 *p = c; 312 return (startp); 313 } 314 315 316 STATIC void 317 removerecordregions(int endoff) 318 { 319 if (ifslastp == NULL) 320 return; 321 322 if (ifsfirst.endoff > endoff) { 323 while (ifsfirst.next != NULL) { 324 struct ifsregion *ifsp; 325 INTOFF; 326 ifsp = ifsfirst.next->next; 327 ckfree(ifsfirst.next); 328 ifsfirst.next = ifsp; 329 INTON; 330 } 331 if (ifsfirst.begoff > endoff) 332 ifslastp = NULL; 333 else { 334 ifslastp = &ifsfirst; 335 ifsfirst.endoff = endoff; 336 } 337 return; 338 } 339 340 ifslastp = &ifsfirst; 341 while (ifslastp->next && ifslastp->next->begoff < endoff) 342 ifslastp=ifslastp->next; 343 while (ifslastp->next != NULL) { 344 struct ifsregion *ifsp; 345 INTOFF; 346 ifsp = ifslastp->next->next; 347 ckfree(ifslastp->next); 348 ifslastp->next = ifsp; 349 INTON; 350 } 351 if (ifslastp->endoff > endoff) 352 ifslastp->endoff = endoff; 353 } 354 355 /* 356 * Expand arithmetic expression. Backup to start of expression, 357 * evaluate, place result in (backed up) result, adjust string position. 358 */ 359 void 360 expari(int flag) 361 { 362 char *p, *start; 363 int result; 364 int begoff; 365 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 366 int quoted; 367 368 369 /* 370 * This routine is slightly over-complicated for 371 * efficiency. First we make sure there is 372 * enough space for the result, which may be bigger 373 * than the expression if we add exponentiation. Next we 374 * scan backwards looking for the start of arithmetic. If the 375 * next previous character is a CTLESC character, then we 376 * have to rescan starting from the beginning since CTLESC 377 * characters have to be processed left to right. 378 */ 379 #if INT_MAX / 1000000000 >= 10 || INT_MIN / 1000000000 <= -10 380 #error "integers with more than 10 digits are not supported" 381 #endif 382 CHECKSTRSPACE(12 - 2, expdest); 383 USTPUTC('\0', expdest); 384 start = stackblock(); 385 p = expdest - 2; 386 while (p >= start && *p != CTLARI) 387 --p; 388 if (p < start || *p != CTLARI) 389 error("missing CTLARI (shouldn't happen)"); 390 if (p > start && *(p - 1) == CTLESC) 391 for (p = start; *p != CTLARI; p++) 392 if (*p == CTLESC) 393 p++; 394 395 if (p[1] == '"') 396 quoted=1; 397 else 398 quoted=0; 399 begoff = p - start; 400 removerecordregions(begoff); 401 if (quotes) 402 rmescapes(p+2); 403 result = arith(p+2); 404 fmtstr(p, 12, "%d", result); 405 while (*p++) 406 ; 407 if (quoted == 0) 408 recordregion(begoff, p - 1 - start, 0); 409 result = expdest - p + 1; 410 STADJUST(-result, expdest); 411 } 412 413 414 /* 415 * Expand stuff in backwards quotes. 416 */ 417 418 STATIC void 419 expbackq(union node *cmd, int quoted, int flag) 420 { 421 struct backcmd in; 422 int i; 423 char buf[128]; 424 char *p; 425 char *dest = expdest; 426 struct ifsregion saveifs, *savelastp; 427 struct nodelist *saveargbackq; 428 char lastc; 429 int startloc = dest - stackblock(); 430 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 431 int saveherefd; 432 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 433 int nnl; 434 435 INTOFF; 436 saveifs = ifsfirst; 437 savelastp = ifslastp; 438 saveargbackq = argbackq; 439 saveherefd = herefd; 440 herefd = -1; 441 p = grabstackstr(dest); 442 evalbackcmd(cmd, &in); 443 ungrabstackstr(p, dest); 444 ifsfirst = saveifs; 445 ifslastp = savelastp; 446 argbackq = saveargbackq; 447 herefd = saveherefd; 448 449 p = in.buf; 450 lastc = '\0'; 451 nnl = 0; 452 /* Don't copy trailing newlines */ 453 for (;;) { 454 if (--in.nleft < 0) { 455 if (in.fd < 0) 456 break; 457 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 458 TRACE(("expbackq: read returns %d\n", i)); 459 if (i <= 0) 460 break; 461 p = buf; 462 in.nleft = i - 1; 463 } 464 lastc = *p++; 465 if (lastc != '\0') { 466 if (quotes && syntax[(int)lastc] == CCTL) 467 STPUTC(CTLESC, dest); 468 if (lastc == '\n') { 469 nnl++; 470 } else { 471 while (nnl > 0) { 472 nnl--; 473 STPUTC('\n', dest); 474 } 475 STPUTC(lastc, dest); 476 } 477 } 478 } 479 480 if (in.fd >= 0) 481 close(in.fd); 482 if (in.buf) 483 ckfree(in.buf); 484 if (in.jp) 485 exitstatus = waitforjob(in.jp, (int *)NULL); 486 if (quoted == 0) 487 recordregion(startloc, dest - stackblock(), 0); 488 TRACE(("evalbackq: size=%d: \"%.*s\"\n", 489 (dest - stackblock()) - startloc, 490 (dest - stackblock()) - startloc, 491 stackblock() + startloc)); 492 expdest = dest; 493 INTON; 494 } 495 496 497 498 STATIC int 499 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 500 int varflags) 501 { 502 char *startp; 503 char *loc = NULL; 504 char *q; 505 int c = 0; 506 int saveherefd = herefd; 507 struct nodelist *saveargbackq = argbackq; 508 int amount; 509 510 herefd = -1; 511 argstr(p, 0); 512 STACKSTRNUL(expdest); 513 herefd = saveherefd; 514 argbackq = saveargbackq; 515 startp = stackblock() + startloc; 516 if (str == NULL) 517 str = stackblock() + strloc; 518 519 switch (subtype) { 520 case VSASSIGN: 521 setvar(str, startp, 0); 522 amount = startp - expdest; 523 STADJUST(amount, expdest); 524 varflags &= ~VSNUL; 525 if (c != 0) 526 *loc = c; 527 return 1; 528 529 case VSQUESTION: 530 if (*p != CTLENDVAR) { 531 outfmt(&errout, "%s\n", startp); 532 error((char *)NULL); 533 } 534 error("%.*s: parameter %snot set", (int)(p - str - 1), 535 str, (varflags & VSNUL) ? "null or " 536 : nullstr); 537 return 0; 538 539 case VSTRIMLEFT: 540 for (loc = startp; loc < str; loc++) { 541 c = *loc; 542 *loc = '\0'; 543 if (patmatch(str, startp, varflags & VSQUOTE)) { 544 *loc = c; 545 goto recordleft; 546 } 547 *loc = c; 548 if ((varflags & VSQUOTE) && *loc == CTLESC) 549 loc++; 550 } 551 return 0; 552 553 case VSTRIMLEFTMAX: 554 for (loc = str - 1; loc >= startp;) { 555 c = *loc; 556 *loc = '\0'; 557 if (patmatch(str, startp, varflags & VSQUOTE)) { 558 *loc = c; 559 goto recordleft; 560 } 561 *loc = c; 562 loc--; 563 if ((varflags & VSQUOTE) && loc > startp && 564 *(loc - 1) == CTLESC) { 565 for (q = startp; q < loc; q++) 566 if (*q == CTLESC) 567 q++; 568 if (q > loc) 569 loc--; 570 } 571 } 572 return 0; 573 574 case VSTRIMRIGHT: 575 for (loc = str - 1; loc >= startp;) { 576 if (patmatch(str, loc, varflags & VSQUOTE)) { 577 amount = loc - expdest; 578 STADJUST(amount, expdest); 579 return 1; 580 } 581 loc--; 582 if ((varflags & VSQUOTE) && loc > startp && 583 *(loc - 1) == CTLESC) { 584 for (q = startp; q < loc; q++) 585 if (*q == CTLESC) 586 q++; 587 if (q > loc) 588 loc--; 589 } 590 } 591 return 0; 592 593 case VSTRIMRIGHTMAX: 594 for (loc = startp; loc < str - 1; loc++) { 595 if (patmatch(str, loc, varflags & VSQUOTE)) { 596 amount = loc - expdest; 597 STADJUST(amount, expdest); 598 return 1; 599 } 600 if ((varflags & VSQUOTE) && *loc == CTLESC) 601 loc++; 602 } 603 return 0; 604 605 606 default: 607 abort(); 608 } 609 610 recordleft: 611 amount = ((str - 1) - (loc - startp)) - expdest; 612 STADJUST(amount, expdest); 613 while (loc != str - 1) 614 *startp++ = *loc++; 615 return 1; 616 } 617 618 619 /* 620 * Expand a variable, and return a pointer to the next character in the 621 * input string. 622 */ 623 624 STATIC char * 625 evalvar(char *p, int flag) 626 { 627 int subtype; 628 int varflags; 629 char *var; 630 char *val; 631 int patloc; 632 int c; 633 int set; 634 int special; 635 int startloc; 636 int varlen; 637 int easy; 638 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 639 640 varflags = *p++; 641 subtype = varflags & VSTYPE; 642 var = p; 643 special = 0; 644 if (! is_name(*p)) 645 special = 1; 646 p = strchr(p, '=') + 1; 647 again: /* jump here after setting a variable with ${var=text} */ 648 if (special) { 649 set = varisset(var, varflags & VSNUL); 650 val = NULL; 651 } else { 652 val = bltinlookup(var, 1); 653 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 654 val = NULL; 655 set = 0; 656 } else 657 set = 1; 658 } 659 varlen = 0; 660 startloc = expdest - stackblock(); 661 if (!set && uflag) { 662 switch (subtype) { 663 case VSNORMAL: 664 case VSTRIMLEFT: 665 case VSTRIMLEFTMAX: 666 case VSTRIMRIGHT: 667 case VSTRIMRIGHTMAX: 668 case VSLENGTH: 669 error("%.*s: parameter not set", (int)(p - var - 1), 670 var); 671 } 672 } 673 if (set && subtype != VSPLUS) { 674 /* insert the value of the variable */ 675 if (special) { 676 varvalue(var, varflags & VSQUOTE, flag & EXP_FULL); 677 if (subtype == VSLENGTH) { 678 varlen = expdest - stackblock() - startloc; 679 STADJUST(-varlen, expdest); 680 } 681 } else { 682 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 683 : BASESYNTAX; 684 685 if (subtype == VSLENGTH) { 686 for (;*val; val++) 687 varlen++; 688 } 689 else { 690 while (*val) { 691 if (quotes && 692 syntax[(int)*val] == CCTL) 693 STPUTC(CTLESC, expdest); 694 STPUTC(*val++, expdest); 695 } 696 697 } 698 } 699 } 700 701 if (subtype == VSPLUS) 702 set = ! set; 703 704 easy = ((varflags & VSQUOTE) == 0 || 705 (*var == '@' && shellparam.nparam != 1)); 706 707 708 switch (subtype) { 709 case VSLENGTH: 710 expdest = cvtnum(varlen, expdest); 711 goto record; 712 713 case VSNORMAL: 714 if (!easy) 715 break; 716 record: 717 recordregion(startloc, expdest - stackblock(), 718 varflags & VSQUOTE); 719 break; 720 721 case VSPLUS: 722 case VSMINUS: 723 if (!set) { 724 argstr(p, flag); 725 break; 726 } 727 if (easy) 728 goto record; 729 break; 730 731 case VSTRIMLEFT: 732 case VSTRIMLEFTMAX: 733 case VSTRIMRIGHT: 734 case VSTRIMRIGHTMAX: 735 if (!set) 736 break; 737 /* 738 * Terminate the string and start recording the pattern 739 * right after it 740 */ 741 STPUTC('\0', expdest); 742 patloc = expdest - stackblock(); 743 if (subevalvar(p, NULL, patloc, subtype, 744 startloc, varflags) == 0) { 745 int amount = (expdest - stackblock() - patloc) + 1; 746 STADJUST(-amount, expdest); 747 } 748 /* Remove any recorded regions beyond start of variable */ 749 removerecordregions(startloc); 750 goto record; 751 752 case VSASSIGN: 753 case VSQUESTION: 754 if (!set) { 755 if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 756 varflags &= ~VSNUL; 757 /* 758 * Remove any recorded regions beyond 759 * start of variable 760 */ 761 removerecordregions(startloc); 762 goto again; 763 } 764 break; 765 } 766 if (easy) 767 goto record; 768 break; 769 770 default: 771 abort(); 772 } 773 774 if (subtype != VSNORMAL) { /* skip to end of alternative */ 775 int nesting = 1; 776 for (;;) { 777 if ((c = *p++) == CTLESC) 778 p++; 779 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 780 if (set) 781 argbackq = argbackq->next; 782 } else if (c == CTLVAR) { 783 if ((*p++ & VSTYPE) != VSNORMAL) 784 nesting++; 785 } else if (c == CTLENDVAR) { 786 if (--nesting == 0) 787 break; 788 } 789 } 790 } 791 return p; 792 } 793 794 795 796 /* 797 * Test whether a specialized variable is set. 798 */ 799 800 STATIC int 801 varisset(char *name, int nulok) 802 { 803 804 if (*name == '!') 805 return backgndpid != -1; 806 else if (*name == '@' || *name == '*') { 807 if (*shellparam.p == NULL) 808 return 0; 809 810 if (nulok) { 811 char **av; 812 813 for (av = shellparam.p; *av; av++) 814 if (**av != '\0') 815 return 1; 816 return 0; 817 } 818 } else if (is_digit(*name)) { 819 char *ap; 820 int num = atoi(name); 821 822 if (num > shellparam.nparam) 823 return 0; 824 825 if (num == 0) 826 ap = arg0; 827 else 828 ap = shellparam.p[num - 1]; 829 830 if (nulok && (ap == NULL || *ap == '\0')) 831 return 0; 832 } 833 return 1; 834 } 835 836 837 838 /* 839 * Add the value of a specialized variable to the stack string. 840 */ 841 842 STATIC void 843 varvalue(char *name, int quoted, int allow_split) 844 { 845 int num; 846 char *p; 847 int i; 848 extern int oexitstatus; 849 char sep; 850 char **ap; 851 char const *syntax; 852 853 #define STRTODEST(p) \ 854 do {\ 855 if (allow_split) { \ 856 syntax = quoted? DQSYNTAX : BASESYNTAX; \ 857 while (*p) { \ 858 if (syntax[(int)*p] == CCTL) \ 859 STPUTC(CTLESC, expdest); \ 860 STPUTC(*p++, expdest); \ 861 } \ 862 } else \ 863 while (*p) \ 864 STPUTC(*p++, expdest); \ 865 } while (0) 866 867 868 switch (*name) { 869 case '$': 870 num = rootpid; 871 goto numvar; 872 case '?': 873 num = oexitstatus; 874 goto numvar; 875 case '#': 876 num = shellparam.nparam; 877 goto numvar; 878 case '!': 879 num = backgndpid; 880 numvar: 881 expdest = cvtnum(num, expdest); 882 break; 883 case '-': 884 for (i = 0 ; i < NOPTS ; i++) { 885 if (optlist[i].val) 886 STPUTC(optlist[i].letter, expdest); 887 } 888 break; 889 case '@': 890 if (allow_split && quoted) { 891 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 892 STRTODEST(p); 893 if (*ap) 894 STPUTC('\0', expdest); 895 } 896 break; 897 } 898 /* FALLTHROUGH */ 899 case '*': 900 if (ifsset() != 0) 901 sep = ifsval()[0]; 902 else 903 sep = ' '; 904 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 905 STRTODEST(p); 906 if (*ap && sep) 907 STPUTC(sep, expdest); 908 } 909 break; 910 case '0': 911 p = arg0; 912 STRTODEST(p); 913 break; 914 default: 915 if (is_digit(*name)) { 916 num = atoi(name); 917 if (num > 0 && num <= shellparam.nparam) { 918 p = shellparam.p[num - 1]; 919 STRTODEST(p); 920 } 921 } 922 break; 923 } 924 } 925 926 927 928 /* 929 * Record the the fact that we have to scan this region of the 930 * string for IFS characters. 931 */ 932 933 STATIC void 934 recordregion(int start, int end, int nulonly) 935 { 936 struct ifsregion *ifsp; 937 938 if (ifslastp == NULL) { 939 ifsp = &ifsfirst; 940 } else { 941 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 942 ifslastp->next = ifsp; 943 } 944 ifslastp = ifsp; 945 ifslastp->next = NULL; 946 ifslastp->begoff = start; 947 ifslastp->endoff = end; 948 ifslastp->nulonly = nulonly; 949 } 950 951 952 953 /* 954 * Break the argument string into pieces based upon IFS and add the 955 * strings to the argument list. The regions of the string to be 956 * searched for IFS characters have been stored by recordregion. 957 */ 958 STATIC void 959 ifsbreakup(char *string, struct arglist *arglist) 960 { 961 struct ifsregion *ifsp; 962 struct strlist *sp; 963 char *start; 964 char *p; 965 char *q; 966 char *ifs; 967 int ifsspc; 968 int nulonly; 969 970 971 start = string; 972 ifsspc = 0; 973 nulonly = 0; 974 if (ifslastp != NULL) { 975 ifsp = &ifsfirst; 976 do { 977 p = string + ifsp->begoff; 978 nulonly = ifsp->nulonly; 979 ifs = nulonly ? nullstr : 980 ( ifsset() ? ifsval() : " \t\n" ); 981 ifsspc = 0; 982 while (p < string + ifsp->endoff) { 983 q = p; 984 if (*p == CTLESC) 985 p++; 986 if (strchr(ifs, *p)) { 987 if (!nulonly) 988 ifsspc = (strchr(" \t\n", *p) != NULL); 989 /* Ignore IFS whitespace at start */ 990 if (q == start && ifsspc) { 991 p++; 992 start = p; 993 continue; 994 } 995 *q = '\0'; 996 sp = (struct strlist *)stalloc(sizeof *sp); 997 sp->text = start; 998 *arglist->lastp = sp; 999 arglist->lastp = &sp->next; 1000 p++; 1001 if (!nulonly) { 1002 for (;;) { 1003 if (p >= string + ifsp->endoff) { 1004 break; 1005 } 1006 q = p; 1007 if (*p == CTLESC) 1008 p++; 1009 if (strchr(ifs, *p) == NULL ) { 1010 p = q; 1011 break; 1012 } else if (strchr(" \t\n",*p) == NULL) { 1013 if (ifsspc) { 1014 p++; 1015 ifsspc = 0; 1016 } else { 1017 p = q; 1018 break; 1019 } 1020 } else 1021 p++; 1022 } 1023 } 1024 start = p; 1025 } else 1026 p++; 1027 } 1028 } while ((ifsp = ifsp->next) != NULL); 1029 if (*start || (!ifsspc && start > string && 1030 (nulonly || 1))) { 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 || stat(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 char *q; 1219 for (p = enddir, q = dp->d_name; 1220 (*p++ = *q++) != '\0';) 1221 continue; 1222 p[-1] = '/'; 1223 expmeta(p, endname); 1224 } 1225 } 1226 } 1227 closedir(dirp); 1228 if (! atend) 1229 endname[-1] = '/'; 1230 } 1231 1232 1233 /* 1234 * Add a file name to the list. 1235 */ 1236 1237 STATIC void 1238 addfname(char *name) 1239 { 1240 char *p; 1241 struct strlist *sp; 1242 1243 p = stalloc(strlen(name) + 1); 1244 scopy(name, p); 1245 sp = (struct strlist *)stalloc(sizeof *sp); 1246 sp->text = p; 1247 *exparg.lastp = sp; 1248 exparg.lastp = &sp->next; 1249 } 1250 1251 1252 /* 1253 * Sort the results of file name expansion. It calculates the number of 1254 * strings to sort and then calls msort (short for merge sort) to do the 1255 * work. 1256 */ 1257 1258 STATIC struct strlist * 1259 expsort(struct strlist *str) 1260 { 1261 int len; 1262 struct strlist *sp; 1263 1264 len = 0; 1265 for (sp = str ; sp ; sp = sp->next) 1266 len++; 1267 return msort(str, len); 1268 } 1269 1270 1271 STATIC struct strlist * 1272 msort(struct strlist *list, int len) 1273 { 1274 struct strlist *p, *q = NULL; 1275 struct strlist **lpp; 1276 int half; 1277 int n; 1278 1279 if (len <= 1) 1280 return list; 1281 half = len >> 1; 1282 p = list; 1283 for (n = half ; --n >= 0 ; ) { 1284 q = p; 1285 p = p->next; 1286 } 1287 q->next = NULL; /* terminate first half of list */ 1288 q = msort(list, half); /* sort first half of list */ 1289 p = msort(p, len - half); /* sort second half */ 1290 lpp = &list; 1291 for (;;) { 1292 if (strcmp(p->text, q->text) < 0) { 1293 *lpp = p; 1294 lpp = &p->next; 1295 if ((p = *lpp) == NULL) { 1296 *lpp = q; 1297 break; 1298 } 1299 } else { 1300 *lpp = q; 1301 lpp = &q->next; 1302 if ((q = *lpp) == NULL) { 1303 *lpp = p; 1304 break; 1305 } 1306 } 1307 } 1308 return list; 1309 } 1310 1311 1312 1313 /* 1314 * Returns true if the pattern matches the string. 1315 */ 1316 1317 int 1318 patmatch(char *pattern, char *string, int squoted) 1319 { 1320 #ifdef notdef 1321 if (pattern[0] == '!' && pattern[1] == '!') 1322 return 1 - pmatch(pattern + 2, string); 1323 else 1324 #endif 1325 return pmatch(pattern, string, squoted); 1326 } 1327 1328 1329 STATIC int 1330 pmatch(char *pattern, char *string, int squoted) 1331 { 1332 char *p, *q; 1333 char c; 1334 1335 p = pattern; 1336 q = string; 1337 for (;;) { 1338 switch (c = *p++) { 1339 case '\0': 1340 goto breakloop; 1341 case CTLESC: 1342 if (squoted && *q == CTLESC) 1343 q++; 1344 if (*q++ != *p++) 1345 return 0; 1346 break; 1347 case CTLQUOTEMARK: 1348 continue; 1349 case '?': 1350 if (squoted && *q == CTLESC) 1351 q++; 1352 if (*q++ == '\0') 1353 return 0; 1354 break; 1355 case '*': 1356 c = *p; 1357 while (c == CTLQUOTEMARK || c == '*') 1358 c = *++p; 1359 if (c != CTLESC && c != CTLQUOTEMARK && 1360 c != '?' && c != '*' && c != '[') { 1361 while (*q != c) { 1362 if (squoted && *q == CTLESC && 1363 q[1] == c) 1364 break; 1365 if (*q == '\0') 1366 return 0; 1367 if (squoted && *q == CTLESC) 1368 q++; 1369 q++; 1370 } 1371 } 1372 do { 1373 if (pmatch(p, q, squoted)) 1374 return 1; 1375 if (squoted && *q == CTLESC) 1376 q++; 1377 } while (*q++ != '\0'); 1378 return 0; 1379 case '[': { 1380 char *endp; 1381 int invert, found; 1382 char chr; 1383 1384 endp = p; 1385 if (*endp == '!' || *endp == '^') 1386 endp++; 1387 for (;;) { 1388 while (*endp == CTLQUOTEMARK) 1389 endp++; 1390 if (*endp == '\0') 1391 goto dft; /* no matching ] */ 1392 if (*endp == CTLESC) 1393 endp++; 1394 if (*++endp == ']') 1395 break; 1396 } 1397 invert = 0; 1398 if (*p == '!' || *p == '^') { 1399 invert++; 1400 p++; 1401 } 1402 found = 0; 1403 chr = *q++; 1404 if (squoted && chr == CTLESC) 1405 chr = *q++; 1406 if (chr == '\0') 1407 return 0; 1408 c = *p++; 1409 do { 1410 if (c == CTLQUOTEMARK) 1411 continue; 1412 if (c == CTLESC) 1413 c = *p++; 1414 if (*p == '-' && p[1] != ']') { 1415 p++; 1416 while (*p == CTLQUOTEMARK) 1417 p++; 1418 if (*p == CTLESC) 1419 p++; 1420 if ( collate_range_cmp(chr, c) >= 0 1421 && collate_range_cmp(chr, *p) <= 0 1422 ) 1423 found = 1; 1424 p++; 1425 } else { 1426 if (chr == c) 1427 found = 1; 1428 } 1429 } while ((c = *p++) != ']'); 1430 if (found == invert) 1431 return 0; 1432 break; 1433 } 1434 dft: default: 1435 if (squoted && *q == CTLESC) 1436 q++; 1437 if (*q++ != c) 1438 return 0; 1439 break; 1440 } 1441 } 1442 breakloop: 1443 if (*q != '\0') 1444 return 0; 1445 return 1; 1446 } 1447 1448 1449 1450 /* 1451 * Remove any CTLESC characters from a string. 1452 */ 1453 1454 void 1455 rmescapes(char *str) 1456 { 1457 char *p, *q; 1458 1459 p = str; 1460 while (*p != CTLESC && *p != CTLQUOTEMARK) { 1461 if (*p++ == '\0') 1462 return; 1463 } 1464 q = p; 1465 while (*p) { 1466 if (*p == CTLQUOTEMARK) { 1467 p++; 1468 continue; 1469 } 1470 if (*p == CTLESC) 1471 p++; 1472 *q++ = *p++; 1473 } 1474 *q = '\0'; 1475 } 1476 1477 1478 1479 /* 1480 * See if a pattern matches in a case statement. 1481 */ 1482 1483 int 1484 casematch(union node *pattern, char *val) 1485 { 1486 struct stackmark smark; 1487 int result; 1488 char *p; 1489 1490 setstackmark(&smark); 1491 argbackq = pattern->narg.backquote; 1492 STARTSTACKSTR(expdest); 1493 ifslastp = NULL; 1494 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1495 STPUTC('\0', expdest); 1496 p = grabstackstr(expdest); 1497 result = patmatch(p, val, 0); 1498 popstackmark(&smark); 1499 return result; 1500 } 1501 1502 /* 1503 * Our own itoa(). 1504 */ 1505 1506 STATIC char * 1507 cvtnum(int num, char *buf) 1508 { 1509 char temp[32]; 1510 int neg = num < 0; 1511 char *p = temp + 31; 1512 1513 temp[31] = '\0'; 1514 1515 do { 1516 *--p = num % 10 + '0'; 1517 } while ((num /= 10) != 0); 1518 1519 if (neg) 1520 *--p = '-'; 1521 1522 while (*p) 1523 STPUTC(*p++, buf); 1524 return buf; 1525 } 1526 1527 /* 1528 * Do most of the work for wordexp(3). 1529 */ 1530 1531 int 1532 wordexpcmd(int argc, char **argv) 1533 { 1534 size_t len; 1535 int i; 1536 1537 out1fmt("%08x", argc - 1); 1538 for (i = 1, len = 0; i < argc; i++) 1539 len += strlen(argv[i]); 1540 out1fmt("%08x", (int)len); 1541 for (i = 1; i < argc; i++) { 1542 out1str(argv[i]); 1543 out1c('\0'); 1544 } 1545 return (0); 1546 } 1547