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 char *expdest; /* output of current string */ 94 struct nodelist *argbackq; /* list of back quote expressions */ 95 struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 96 struct ifsregion *ifslastp; /* last struct in list */ 97 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 int ret; 123 124 c1 &= UCHAR_MAX; 125 c2 &= UCHAR_MAX; 126 if (c1 == c2) 127 return (0); 128 s1[0] = c1; 129 s2[0] = c2; 130 if ((ret = strcoll(s1, s2)) != 0) 131 return (ret); 132 return (c1 - c2); 133 } 134 135 /* 136 * Expand shell variables and backquotes inside a here document. 137 * union node *arg the document 138 * int fd; where to write the expanded version 139 */ 140 141 void 142 expandhere(union node *arg, int fd) 143 { 144 herefd = fd; 145 expandarg(arg, (struct arglist *)NULL, 0); 146 xwrite(fd, stackblock(), expdest - stackblock()); 147 } 148 149 150 /* 151 * Perform variable substitution and command substitution on an argument, 152 * placing the resulting list of arguments in arglist. If EXP_FULL is true, 153 * perform splitting and file name expansion. When arglist is NULL, perform 154 * here document expansion. 155 */ 156 157 void 158 expandarg(union node *arg, struct arglist *arglist, int flag) 159 { 160 struct strlist *sp; 161 char *p; 162 163 argbackq = arg->narg.backquote; 164 STARTSTACKSTR(expdest); 165 ifsfirst.next = NULL; 166 ifslastp = NULL; 167 argstr(arg->narg.text, flag); 168 if (arglist == NULL) { 169 return; /* here document expanded */ 170 } 171 STPUTC('\0', expdest); 172 p = grabstackstr(expdest); 173 exparg.lastp = &exparg.list; 174 /* 175 * TODO - EXP_REDIR 176 */ 177 if (flag & EXP_FULL) { 178 ifsbreakup(p, &exparg); 179 *exparg.lastp = NULL; 180 exparg.lastp = &exparg.list; 181 expandmeta(exparg.list, flag); 182 } else { 183 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 184 rmescapes(p); 185 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 186 sp->text = p; 187 *exparg.lastp = sp; 188 exparg.lastp = &sp->next; 189 } 190 while (ifsfirst.next != NULL) { 191 struct ifsregion *ifsp; 192 INTOFF; 193 ifsp = ifsfirst.next->next; 194 ckfree(ifsfirst.next); 195 ifsfirst.next = ifsp; 196 INTON; 197 } 198 *exparg.lastp = NULL; 199 if (exparg.list) { 200 *arglist->lastp = exparg.list; 201 arglist->lastp = exparg.lastp; 202 } 203 } 204 205 206 207 /* 208 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 209 * characters to allow for further processing. Otherwise treat 210 * $@ like $* since no splitting will be performed. 211 */ 212 213 STATIC void 214 argstr(char *p, int flag) 215 { 216 char c; 217 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 218 int firsteq = 1; 219 220 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 221 p = exptilde(p, flag); 222 for (;;) { 223 switch (c = *p++) { 224 case '\0': 225 case CTLENDVAR: /* ??? */ 226 goto breakloop; 227 case CTLQUOTEMARK: 228 /* "$@" syntax adherence hack */ 229 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 230 break; 231 if ((flag & EXP_FULL) != 0) 232 STPUTC(c, expdest); 233 break; 234 case CTLESC: 235 if (quotes) 236 STPUTC(c, expdest); 237 c = *p++; 238 STPUTC(c, expdest); 239 break; 240 case CTLVAR: 241 p = evalvar(p, flag); 242 break; 243 case CTLBACKQ: 244 case CTLBACKQ|CTLQUOTE: 245 expbackq(argbackq->n, c & CTLQUOTE, flag); 246 argbackq = argbackq->next; 247 break; 248 case CTLENDARI: 249 expari(flag); 250 break; 251 case ':': 252 case '=': 253 /* 254 * sort of a hack - expand tildes in variable 255 * assignments (after the first '=' and after ':'s). 256 */ 257 STPUTC(c, expdest); 258 if (flag & EXP_VARTILDE && *p == '~') { 259 if (c == '=') { 260 if (firsteq) 261 firsteq = 0; 262 else 263 break; 264 } 265 p = exptilde(p, flag); 266 } 267 break; 268 default: 269 STPUTC(c, expdest); 270 } 271 } 272 breakloop:; 273 } 274 275 STATIC char * 276 exptilde(char *p, int flag) 277 { 278 char c, *startp = p; 279 struct passwd *pw; 280 char *home; 281 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 282 283 while ((c = *p) != '\0') { 284 switch(c) { 285 case CTLESC: 286 return (startp); 287 case CTLQUOTEMARK: 288 return (startp); 289 case ':': 290 if (flag & EXP_VARTILDE) 291 goto done; 292 break; 293 case '/': 294 goto done; 295 } 296 p++; 297 } 298 done: 299 *p = '\0'; 300 if (*(startp+1) == '\0') { 301 if ((home = lookupvar("HOME")) == NULL) 302 goto lose; 303 } else { 304 if ((pw = getpwnam(startp+1)) == NULL) 305 goto lose; 306 home = pw->pw_dir; 307 } 308 if (*home == '\0') 309 goto lose; 310 *p = c; 311 while ((c = *home++) != '\0') { 312 if (quotes && SQSYNTAX[(int)c] == CCTL) 313 STPUTC(CTLESC, expdest); 314 STPUTC(c, expdest); 315 } 316 return (p); 317 lose: 318 *p = c; 319 return (startp); 320 } 321 322 323 STATIC void 324 removerecordregions(int endoff) 325 { 326 if (ifslastp == NULL) 327 return; 328 329 if (ifsfirst.endoff > endoff) { 330 while (ifsfirst.next != NULL) { 331 struct ifsregion *ifsp; 332 INTOFF; 333 ifsp = ifsfirst.next->next; 334 ckfree(ifsfirst.next); 335 ifsfirst.next = ifsp; 336 INTON; 337 } 338 if (ifsfirst.begoff > endoff) 339 ifslastp = NULL; 340 else { 341 ifslastp = &ifsfirst; 342 ifsfirst.endoff = endoff; 343 } 344 return; 345 } 346 347 ifslastp = &ifsfirst; 348 while (ifslastp->next && ifslastp->next->begoff < endoff) 349 ifslastp=ifslastp->next; 350 while (ifslastp->next != NULL) { 351 struct ifsregion *ifsp; 352 INTOFF; 353 ifsp = ifslastp->next->next; 354 ckfree(ifslastp->next); 355 ifslastp->next = ifsp; 356 INTON; 357 } 358 if (ifslastp->endoff > endoff) 359 ifslastp->endoff = endoff; 360 } 361 362 /* 363 * Expand arithmetic expression. Backup to start of expression, 364 * evaluate, place result in (backed up) result, adjust string position. 365 */ 366 void 367 expari(int flag) 368 { 369 char *p, *start; 370 int result; 371 int begoff; 372 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 373 int quoted; 374 375 376 /* 377 * This routine is slightly over-complicated for 378 * efficiency. First we make sure there is 379 * enough space for the result, which may be bigger 380 * than the expression if we add exponentiation. Next we 381 * scan backwards looking for the start of arithmetic. If the 382 * next previous character is a CTLESC character, then we 383 * have to rescan starting from the beginning since CTLESC 384 * characters have to be processed left to right. 385 */ 386 #if INT_MAX / 1000000000 >= 10 || INT_MIN / 1000000000 <= -10 387 #error "integers with more than 10 digits are not supported" 388 #endif 389 CHECKSTRSPACE(12 - 2, expdest); 390 USTPUTC('\0', expdest); 391 start = stackblock(); 392 p = expdest - 2; 393 while (p >= start && *p != CTLARI) 394 --p; 395 if (p < start || *p != CTLARI) 396 error("missing CTLARI (shouldn't happen)"); 397 if (p > start && *(p - 1) == CTLESC) 398 for (p = start; *p != CTLARI; p++) 399 if (*p == CTLESC) 400 p++; 401 402 if (p[1] == '"') 403 quoted=1; 404 else 405 quoted=0; 406 begoff = p - start; 407 removerecordregions(begoff); 408 if (quotes) 409 rmescapes(p+2); 410 result = arith(p+2); 411 fmtstr(p, 12, "%d", result); 412 while (*p++) 413 ; 414 if (quoted == 0) 415 recordregion(begoff, p - 1 - start, 0); 416 result = expdest - p + 1; 417 STADJUST(-result, expdest); 418 } 419 420 421 /* 422 * Expand stuff in backwards quotes. 423 */ 424 425 STATIC void 426 expbackq(union node *cmd, int quoted, int flag) 427 { 428 struct backcmd in; 429 int i; 430 char buf[128]; 431 char *p; 432 char *dest = expdest; 433 struct ifsregion saveifs, *savelastp; 434 struct nodelist *saveargbackq; 435 char lastc; 436 int startloc = dest - stackblock(); 437 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 438 int saveherefd; 439 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 440 441 INTOFF; 442 saveifs = ifsfirst; 443 savelastp = ifslastp; 444 saveargbackq = argbackq; 445 saveherefd = herefd; 446 herefd = -1; 447 p = grabstackstr(dest); 448 evalbackcmd(cmd, &in); 449 ungrabstackstr(p, dest); 450 ifsfirst = saveifs; 451 ifslastp = savelastp; 452 argbackq = saveargbackq; 453 herefd = saveherefd; 454 455 p = in.buf; 456 lastc = '\0'; 457 for (;;) { 458 if (--in.nleft < 0) { 459 if (in.fd < 0) 460 break; 461 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 462 TRACE(("expbackq: read returns %d\n", i)); 463 if (i <= 0) 464 break; 465 p = buf; 466 in.nleft = i - 1; 467 } 468 lastc = *p++; 469 if (lastc != '\0') { 470 if (quotes && syntax[(int)lastc] == CCTL) 471 STPUTC(CTLESC, dest); 472 STPUTC(lastc, dest); 473 } 474 } 475 476 /* Eat all trailing newlines */ 477 for (p--; lastc == '\n'; lastc = *--p) 478 STUNPUTC(dest); 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", 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", p - var - 1, var); 670 } 671 } 672 if (set && subtype != VSPLUS) { 673 /* insert the value of the variable */ 674 if (special) { 675 varvalue(var, varflags & VSQUOTE, flag & EXP_FULL); 676 if (subtype == VSLENGTH) { 677 varlen = expdest - stackblock() - startloc; 678 STADJUST(-varlen, expdest); 679 } 680 } else { 681 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 682 : BASESYNTAX; 683 684 if (subtype == VSLENGTH) { 685 for (;*val; val++) 686 varlen++; 687 } 688 else { 689 while (*val) { 690 if (quotes && 691 syntax[(int)*val] == CCTL) 692 STPUTC(CTLESC, expdest); 693 STPUTC(*val++, expdest); 694 } 695 696 } 697 } 698 } 699 700 if (subtype == VSPLUS) 701 set = ! set; 702 703 easy = ((varflags & VSQUOTE) == 0 || 704 (*var == '@' && shellparam.nparam != 1)); 705 706 707 switch (subtype) { 708 case VSLENGTH: 709 expdest = cvtnum(varlen, expdest); 710 goto record; 711 712 case VSNORMAL: 713 if (!easy) 714 break; 715 record: 716 recordregion(startloc, expdest - stackblock(), 717 varflags & VSQUOTE); 718 break; 719 720 case VSPLUS: 721 case VSMINUS: 722 if (!set) { 723 argstr(p, flag); 724 break; 725 } 726 if (easy) 727 goto record; 728 break; 729 730 case VSTRIMLEFT: 731 case VSTRIMLEFTMAX: 732 case VSTRIMRIGHT: 733 case VSTRIMRIGHTMAX: 734 if (!set) 735 break; 736 /* 737 * Terminate the string and start recording the pattern 738 * right after it 739 */ 740 STPUTC('\0', expdest); 741 patloc = expdest - stackblock(); 742 if (subevalvar(p, NULL, patloc, subtype, 743 startloc, varflags) == 0) { 744 int amount = (expdest - stackblock() - patloc) + 1; 745 STADJUST(-amount, expdest); 746 } 747 /* Remove any recorded regions beyond start of variable */ 748 removerecordregions(startloc); 749 goto record; 750 751 case VSASSIGN: 752 case VSQUESTION: 753 if (!set) { 754 if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 755 varflags &= ~VSNUL; 756 /* 757 * Remove any recorded regions beyond 758 * start of variable 759 */ 760 removerecordregions(startloc); 761 goto again; 762 } 763 break; 764 } 765 if (easy) 766 goto record; 767 break; 768 769 default: 770 abort(); 771 } 772 773 if (subtype != VSNORMAL) { /* skip to end of alternative */ 774 int nesting = 1; 775 for (;;) { 776 if ((c = *p++) == CTLESC) 777 p++; 778 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 779 if (set) 780 argbackq = argbackq->next; 781 } else if (c == CTLVAR) { 782 if ((*p++ & VSTYPE) != VSNORMAL) 783 nesting++; 784 } else if (c == CTLENDVAR) { 785 if (--nesting == 0) 786 break; 787 } 788 } 789 } 790 return p; 791 } 792 793 794 795 /* 796 * Test whether a specialized variable is set. 797 */ 798 799 STATIC int 800 varisset(char *name, int nulok) 801 { 802 803 if (*name == '!') 804 return backgndpid != -1; 805 else if (*name == '@' || *name == '*') { 806 if (*shellparam.p == NULL) 807 return 0; 808 809 if (nulok) { 810 char **av; 811 812 for (av = shellparam.p; *av; av++) 813 if (**av != '\0') 814 return 1; 815 return 0; 816 } 817 } else if (is_digit(*name)) { 818 char *ap; 819 int num = atoi(name); 820 821 if (num > shellparam.nparam) 822 return 0; 823 824 if (num == 0) 825 ap = arg0; 826 else 827 ap = shellparam.p[num - 1]; 828 829 if (nulok && (ap == NULL || *ap == '\0')) 830 return 0; 831 } 832 return 1; 833 } 834 835 836 837 /* 838 * Add the value of a specialized variable to the stack string. 839 */ 840 841 STATIC void 842 varvalue(char *name, int quoted, int allow_split) 843 { 844 int num; 845 char *p; 846 int i; 847 extern int oexitstatus; 848 char sep; 849 char **ap; 850 char const *syntax; 851 852 #define STRTODEST(p) \ 853 do {\ 854 if (allow_split) { \ 855 syntax = quoted? DQSYNTAX : BASESYNTAX; \ 856 while (*p) { \ 857 if (syntax[(int)*p] == CCTL) \ 858 STPUTC(CTLESC, expdest); \ 859 STPUTC(*p++, expdest); \ 860 } \ 861 } else \ 862 while (*p) \ 863 STPUTC(*p++, expdest); \ 864 } while (0) 865 866 867 switch (*name) { 868 case '$': 869 num = rootpid; 870 goto numvar; 871 case '?': 872 num = oexitstatus; 873 goto numvar; 874 case '#': 875 num = shellparam.nparam; 876 goto numvar; 877 case '!': 878 num = backgndpid; 879 numvar: 880 expdest = cvtnum(num, expdest); 881 break; 882 case '-': 883 for (i = 0 ; i < NOPTS ; i++) { 884 if (optlist[i].val) 885 STPUTC(optlist[i].letter, expdest); 886 } 887 break; 888 case '@': 889 if (allow_split && quoted) { 890 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 891 STRTODEST(p); 892 if (*ap) 893 STPUTC('\0', expdest); 894 } 895 break; 896 } 897 /* FALLTHROUGH */ 898 case '*': 899 if (ifsset() != 0) 900 sep = ifsval()[0]; 901 else 902 sep = ' '; 903 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 904 STRTODEST(p); 905 if (*ap && sep) 906 STPUTC(sep, expdest); 907 } 908 break; 909 case '0': 910 p = arg0; 911 STRTODEST(p); 912 break; 913 default: 914 if (is_digit(*name)) { 915 num = atoi(name); 916 if (num > 0 && num <= shellparam.nparam) { 917 p = shellparam.p[num - 1]; 918 STRTODEST(p); 919 } 920 } 921 break; 922 } 923 } 924 925 926 927 /* 928 * Record the the fact that we have to scan this region of the 929 * string for IFS characters. 930 */ 931 932 STATIC void 933 recordregion(int start, int end, int nulonly) 934 { 935 struct ifsregion *ifsp; 936 937 if (ifslastp == NULL) { 938 ifsp = &ifsfirst; 939 } else { 940 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 941 ifslastp->next = ifsp; 942 } 943 ifslastp = ifsp; 944 ifslastp->next = NULL; 945 ifslastp->begoff = start; 946 ifslastp->endoff = end; 947 ifslastp->nulonly = nulonly; 948 } 949 950 951 952 /* 953 * Break the argument string into pieces based upon IFS and add the 954 * strings to the argument list. The regions of the string to be 955 * searched for IFS characters have been stored by recordregion. 956 */ 957 STATIC void 958 ifsbreakup(char *string, struct arglist *arglist) 959 { 960 struct ifsregion *ifsp; 961 struct strlist *sp; 962 char *start; 963 char *p; 964 char *q; 965 char *ifs; 966 int ifsspc; 967 int nulonly; 968 969 970 start = string; 971 ifsspc = 0; 972 nulonly = 0; 973 if (ifslastp != NULL) { 974 ifsp = &ifsfirst; 975 do { 976 p = string + ifsp->begoff; 977 nulonly = ifsp->nulonly; 978 ifs = nulonly ? nullstr : 979 ( ifsset() ? ifsval() : " \t\n" ); 980 ifsspc = 0; 981 while (p < string + ifsp->endoff) { 982 q = p; 983 if (*p == CTLESC) 984 p++; 985 if (strchr(ifs, *p)) { 986 if (!nulonly) 987 ifsspc = (strchr(" \t\n", *p) != NULL); 988 /* Ignore IFS whitespace at start */ 989 if (q == start && ifsspc) { 990 p++; 991 start = p; 992 continue; 993 } 994 *q = '\0'; 995 sp = (struct strlist *)stalloc(sizeof *sp); 996 sp->text = start; 997 *arglist->lastp = sp; 998 arglist->lastp = &sp->next; 999 p++; 1000 if (!nulonly) { 1001 for (;;) { 1002 if (p >= string + ifsp->endoff) { 1003 break; 1004 } 1005 q = p; 1006 if (*p == CTLESC) 1007 p++; 1008 if (strchr(ifs, *p) == NULL ) { 1009 p = q; 1010 break; 1011 } else if (strchr(" \t\n",*p) == NULL) { 1012 if (ifsspc) { 1013 p++; 1014 ifsspc = 0; 1015 } else { 1016 p = q; 1017 break; 1018 } 1019 } else 1020 p++; 1021 } 1022 } 1023 start = p; 1024 } else 1025 p++; 1026 } 1027 } while ((ifsp = ifsp->next) != NULL); 1028 if (*start || (!ifsspc && start > string && 1029 (nulonly || 1))) { 1030 sp = (struct strlist *)stalloc(sizeof *sp); 1031 sp->text = start; 1032 *arglist->lastp = sp; 1033 arglist->lastp = &sp->next; 1034 } 1035 } else { 1036 sp = (struct strlist *)stalloc(sizeof *sp); 1037 sp->text = start; 1038 *arglist->lastp = sp; 1039 arglist->lastp = &sp->next; 1040 } 1041 } 1042 1043 1044 1045 /* 1046 * Expand shell metacharacters. At this point, the only control characters 1047 * should be escapes. The results are stored in the list exparg. 1048 */ 1049 1050 char *expdir; 1051 1052 1053 STATIC void 1054 expandmeta(struct strlist *str, int flag __unused) 1055 { 1056 char *p; 1057 struct strlist **savelastp; 1058 struct strlist *sp; 1059 char c; 1060 /* TODO - EXP_REDIR */ 1061 1062 while (str) { 1063 if (fflag) 1064 goto nometa; 1065 p = str->text; 1066 for (;;) { /* fast check for meta chars */ 1067 if ((c = *p++) == '\0') 1068 goto nometa; 1069 if (c == '*' || c == '?' || c == '[' || c == '!') 1070 break; 1071 } 1072 savelastp = exparg.lastp; 1073 INTOFF; 1074 if (expdir == NULL) { 1075 int i = strlen(str->text); 1076 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ 1077 } 1078 1079 expmeta(expdir, str->text); 1080 ckfree(expdir); 1081 expdir = NULL; 1082 INTON; 1083 if (exparg.lastp == savelastp) { 1084 /* 1085 * no matches 1086 */ 1087 nometa: 1088 *exparg.lastp = str; 1089 rmescapes(str->text); 1090 exparg.lastp = &str->next; 1091 } else { 1092 *exparg.lastp = NULL; 1093 *savelastp = sp = expsort(*savelastp); 1094 while (sp->next != NULL) 1095 sp = sp->next; 1096 exparg.lastp = &sp->next; 1097 } 1098 str = str->next; 1099 } 1100 } 1101 1102 1103 /* 1104 * Do metacharacter (i.e. *, ?, [...]) expansion. 1105 */ 1106 1107 STATIC void 1108 expmeta(char *enddir, char *name) 1109 { 1110 char *p; 1111 char *q; 1112 char *start; 1113 char *endname; 1114 int metaflag; 1115 struct stat statb; 1116 DIR *dirp; 1117 struct dirent *dp; 1118 int atend; 1119 int matchdot; 1120 1121 metaflag = 0; 1122 start = name; 1123 for (p = name ; ; p++) { 1124 if (*p == '*' || *p == '?') 1125 metaflag = 1; 1126 else if (*p == '[') { 1127 q = p + 1; 1128 if (*q == '!' || *q == '^') 1129 q++; 1130 for (;;) { 1131 while (*q == CTLQUOTEMARK) 1132 q++; 1133 if (*q == CTLESC) 1134 q++; 1135 if (*q == '/' || *q == '\0') 1136 break; 1137 if (*++q == ']') { 1138 metaflag = 1; 1139 break; 1140 } 1141 } 1142 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { 1143 metaflag = 1; 1144 } else if (*p == '\0') 1145 break; 1146 else if (*p == CTLQUOTEMARK) 1147 continue; 1148 else if (*p == CTLESC) 1149 p++; 1150 if (*p == '/') { 1151 if (metaflag) 1152 break; 1153 start = p + 1; 1154 } 1155 } 1156 if (metaflag == 0) { /* we've reached the end of the file name */ 1157 if (enddir != expdir) 1158 metaflag++; 1159 for (p = name ; ; p++) { 1160 if (*p == CTLQUOTEMARK) 1161 continue; 1162 if (*p == CTLESC) 1163 p++; 1164 *enddir++ = *p; 1165 if (*p == '\0') 1166 break; 1167 } 1168 if (metaflag == 0 || stat(expdir, &statb) >= 0) 1169 addfname(expdir); 1170 return; 1171 } 1172 endname = p; 1173 if (start != name) { 1174 p = name; 1175 while (p < start) { 1176 while (*p == CTLQUOTEMARK) 1177 p++; 1178 if (*p == CTLESC) 1179 p++; 1180 *enddir++ = *p++; 1181 } 1182 } 1183 if (enddir == expdir) { 1184 p = "."; 1185 } else if (enddir == expdir + 1 && *expdir == '/') { 1186 p = "/"; 1187 } else { 1188 p = expdir; 1189 enddir[-1] = '\0'; 1190 } 1191 if ((dirp = opendir(p)) == NULL) 1192 return; 1193 if (enddir != expdir) 1194 enddir[-1] = '/'; 1195 if (*endname == 0) { 1196 atend = 1; 1197 } else { 1198 atend = 0; 1199 *endname++ = '\0'; 1200 } 1201 matchdot = 0; 1202 p = start; 1203 while (*p == CTLQUOTEMARK) 1204 p++; 1205 if (*p == CTLESC) 1206 p++; 1207 if (*p == '.') 1208 matchdot++; 1209 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1210 if (dp->d_name[0] == '.' && ! matchdot) 1211 continue; 1212 if (patmatch(start, dp->d_name, 0)) { 1213 if (atend) { 1214 scopy(dp->d_name, enddir); 1215 addfname(expdir); 1216 } else { 1217 char *q; 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