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 inquotes; /* search for nul bytes only */ 86 }; 87 88 89 STATIC char *expdest; /* output of current string */ 90 STATIC struct nodelist *argbackq; /* list of back quote expressions */ 91 STATIC struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 92 STATIC struct ifsregion *ifslastp; /* last struct in list */ 93 STATIC struct arglist exparg; /* holds expanded arg list */ 94 95 STATIC void argstr(char *, int); 96 STATIC char *exptilde(char *, int); 97 STATIC void expbackq(union node *, int, int); 98 STATIC int subevalvar(char *, char *, int, int, int, int); 99 STATIC char *evalvar(char *, int); 100 STATIC int varisset(char *, int); 101 STATIC void varvalue(char *, int, int, int); 102 STATIC void recordregion(int, int, int); 103 STATIC void removerecordregions(int); 104 STATIC void ifsbreakup(char *, struct arglist *); 105 STATIC void expandmeta(struct strlist *, int); 106 STATIC void expmeta(char *, char *); 107 STATIC void addfname(char *); 108 STATIC struct strlist *expsort(struct strlist *); 109 STATIC struct strlist *msort(struct strlist *, int); 110 STATIC int pmatch(char *, char *, int); 111 STATIC char *cvtnum(int, char *); 112 STATIC int collate_range_cmp(int, int); 113 114 STATIC int 115 collate_range_cmp(int c1, int c2) 116 { 117 static char s1[2], s2[2]; 118 119 s1[0] = c1; 120 s2[0] = c2; 121 return (strcoll(s1, s2)); 122 } 123 124 /* 125 * Expand shell variables and backquotes inside a here document. 126 * union node *arg the document 127 * int fd; where to write the expanded version 128 */ 129 130 void 131 expandhere(union node *arg, int fd) 132 { 133 herefd = fd; 134 expandarg(arg, (struct arglist *)NULL, 0); 135 xwrite(fd, stackblock(), expdest - stackblock()); 136 } 137 138 139 /* 140 * Perform variable substitution and command substitution on an argument, 141 * placing the resulting list of arguments in arglist. If EXP_FULL is true, 142 * perform splitting and file name expansion. When arglist is NULL, perform 143 * here document expansion. 144 */ 145 146 void 147 expandarg(union node *arg, struct arglist *arglist, int flag) 148 { 149 struct strlist *sp; 150 char *p; 151 152 argbackq = arg->narg.backquote; 153 STARTSTACKSTR(expdest); 154 ifsfirst.next = NULL; 155 ifslastp = NULL; 156 argstr(arg->narg.text, flag); 157 if (arglist == NULL) { 158 return; /* here document expanded */ 159 } 160 STPUTC('\0', expdest); 161 p = grabstackstr(expdest); 162 exparg.lastp = &exparg.list; 163 /* 164 * TODO - EXP_REDIR 165 */ 166 if (flag & EXP_FULL) { 167 ifsbreakup(p, &exparg); 168 *exparg.lastp = NULL; 169 exparg.lastp = &exparg.list; 170 expandmeta(exparg.list, flag); 171 } else { 172 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 173 rmescapes(p); 174 sp = (struct strlist *)stalloc(sizeof (struct strlist)); 175 sp->text = p; 176 *exparg.lastp = sp; 177 exparg.lastp = &sp->next; 178 } 179 while (ifsfirst.next != NULL) { 180 struct ifsregion *ifsp; 181 INTOFF; 182 ifsp = ifsfirst.next->next; 183 ckfree(ifsfirst.next); 184 ifsfirst.next = ifsp; 185 INTON; 186 } 187 *exparg.lastp = NULL; 188 if (exparg.list) { 189 *arglist->lastp = exparg.list; 190 arglist->lastp = exparg.lastp; 191 } 192 } 193 194 195 196 /* 197 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 198 * characters to allow for further processing. Otherwise treat 199 * $@ like $* since no splitting will be performed. 200 */ 201 202 STATIC void 203 argstr(char *p, int flag) 204 { 205 char c; 206 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 207 int firsteq = 1; 208 209 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 210 p = exptilde(p, flag); 211 for (;;) { 212 switch (c = *p++) { 213 case '\0': 214 case CTLENDVAR: /* ??? */ 215 goto breakloop; 216 case CTLQUOTEMARK: 217 /* "$@" syntax adherence hack */ 218 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 219 break; 220 if ((flag & EXP_FULL) != 0) 221 STPUTC(c, expdest); 222 break; 223 case CTLESC: 224 if (quotes) 225 STPUTC(c, expdest); 226 c = *p++; 227 STPUTC(c, expdest); 228 break; 229 case CTLVAR: 230 p = evalvar(p, flag); 231 break; 232 case CTLBACKQ: 233 case CTLBACKQ|CTLQUOTE: 234 expbackq(argbackq->n, c & CTLQUOTE, flag); 235 argbackq = argbackq->next; 236 break; 237 case CTLENDARI: 238 expari(flag); 239 break; 240 case ':': 241 case '=': 242 /* 243 * sort of a hack - expand tildes in variable 244 * assignments (after the first '=' and after ':'s). 245 */ 246 STPUTC(c, expdest); 247 if (flag & EXP_VARTILDE && *p == '~') { 248 if (c == '=') { 249 if (firsteq) 250 firsteq = 0; 251 else 252 break; 253 } 254 p = exptilde(p, flag); 255 } 256 break; 257 default: 258 STPUTC(c, expdest); 259 } 260 } 261 breakloop:; 262 } 263 264 STATIC char * 265 exptilde(char *p, int flag) 266 { 267 char c, *startp = p; 268 struct passwd *pw; 269 char *home; 270 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 271 272 while ((c = *p) != '\0') { 273 switch(c) { 274 case CTLESC: 275 return (startp); 276 case CTLQUOTEMARK: 277 return (startp); 278 case ':': 279 if (flag & EXP_VARTILDE) 280 goto done; 281 break; 282 case '/': 283 goto done; 284 } 285 p++; 286 } 287 done: 288 *p = '\0'; 289 if (*(startp+1) == '\0') { 290 if ((home = lookupvar("HOME")) == NULL) 291 goto lose; 292 } else { 293 if ((pw = getpwnam(startp+1)) == NULL) 294 goto lose; 295 home = pw->pw_dir; 296 } 297 if (*home == '\0') 298 goto lose; 299 *p = c; 300 while ((c = *home++) != '\0') { 301 if (quotes && SQSYNTAX[(int)c] == CCTL) 302 STPUTC(CTLESC, expdest); 303 STPUTC(c, expdest); 304 } 305 return (p); 306 lose: 307 *p = c; 308 return (startp); 309 } 310 311 312 STATIC void 313 removerecordregions(int endoff) 314 { 315 if (ifslastp == NULL) 316 return; 317 318 if (ifsfirst.endoff > endoff) { 319 while (ifsfirst.next != NULL) { 320 struct ifsregion *ifsp; 321 INTOFF; 322 ifsp = ifsfirst.next->next; 323 ckfree(ifsfirst.next); 324 ifsfirst.next = ifsp; 325 INTON; 326 } 327 if (ifsfirst.begoff > endoff) 328 ifslastp = NULL; 329 else { 330 ifslastp = &ifsfirst; 331 ifsfirst.endoff = endoff; 332 } 333 return; 334 } 335 336 ifslastp = &ifsfirst; 337 while (ifslastp->next && ifslastp->next->begoff < endoff) 338 ifslastp=ifslastp->next; 339 while (ifslastp->next != NULL) { 340 struct ifsregion *ifsp; 341 INTOFF; 342 ifsp = ifslastp->next->next; 343 ckfree(ifslastp->next); 344 ifslastp->next = ifsp; 345 INTON; 346 } 347 if (ifslastp->endoff > endoff) 348 ifslastp->endoff = endoff; 349 } 350 351 /* 352 * Expand arithmetic expression. Backup to start of expression, 353 * evaluate, place result in (backed up) result, adjust string position. 354 */ 355 void 356 expari(int flag) 357 { 358 char *p, *start; 359 arith_t 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 CHECKSTRSPACE(DIGITS(result) - 2, expdest); 376 USTPUTC('\0', expdest); 377 start = stackblock(); 378 p = expdest - 2; 379 while (p >= start && *p != CTLARI) 380 --p; 381 if (p < start || *p != CTLARI) 382 error("missing CTLARI (shouldn't happen)"); 383 if (p > start && *(p - 1) == CTLESC) 384 for (p = start; *p != CTLARI; p++) 385 if (*p == CTLESC) 386 p++; 387 388 if (p[1] == '"') 389 quoted=1; 390 else 391 quoted=0; 392 begoff = p - start; 393 removerecordregions(begoff); 394 if (quotes) 395 rmescapes(p+2); 396 result = arith(p+2); 397 fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 398 while (*p++) 399 ; 400 if (quoted == 0) 401 recordregion(begoff, p - 1 - start, 0); 402 result = expdest - p + 1; 403 STADJUST(-result, expdest); 404 } 405 406 407 /* 408 * Expand stuff in backwards quotes. 409 */ 410 411 STATIC void 412 expbackq(union node *cmd, int quoted, int flag) 413 { 414 struct backcmd in; 415 int i; 416 char buf[128]; 417 char *p; 418 char *dest = expdest; 419 struct ifsregion saveifs, *savelastp; 420 struct nodelist *saveargbackq; 421 char lastc; 422 int startloc = dest - stackblock(); 423 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 424 int saveherefd; 425 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 426 int nnl; 427 428 INTOFF; 429 saveifs = ifsfirst; 430 savelastp = ifslastp; 431 saveargbackq = argbackq; 432 saveherefd = herefd; 433 herefd = -1; 434 p = grabstackstr(dest); 435 evalbackcmd(cmd, &in); 436 ungrabstackstr(p, dest); 437 ifsfirst = saveifs; 438 ifslastp = savelastp; 439 argbackq = saveargbackq; 440 herefd = saveherefd; 441 442 p = in.buf; 443 lastc = '\0'; 444 nnl = 0; 445 /* Don't copy trailing newlines */ 446 for (;;) { 447 if (--in.nleft < 0) { 448 if (in.fd < 0) 449 break; 450 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 451 TRACE(("expbackq: read returns %d\n", i)); 452 if (i <= 0) 453 break; 454 p = buf; 455 in.nleft = i - 1; 456 } 457 lastc = *p++; 458 if (lastc != '\0') { 459 if (quotes && syntax[(int)lastc] == CCTL) 460 STPUTC(CTLESC, dest); 461 if (lastc == '\n') { 462 nnl++; 463 } else { 464 while (nnl > 0) { 465 nnl--; 466 STPUTC('\n', dest); 467 } 468 STPUTC(lastc, dest); 469 } 470 } 471 } 472 473 if (in.fd >= 0) 474 close(in.fd); 475 if (in.buf) 476 ckfree(in.buf); 477 if (in.jp) 478 exitstatus = waitforjob(in.jp, (int *)NULL); 479 if (quoted == 0) 480 recordregion(startloc, dest - stackblock(), 0); 481 TRACE(("evalbackq: size=%d: \"%.*s\"\n", 482 (dest - stackblock()) - startloc, 483 (dest - stackblock()) - startloc, 484 stackblock() + startloc)); 485 expdest = dest; 486 INTON; 487 } 488 489 490 491 STATIC int 492 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 493 int varflags) 494 { 495 char *startp; 496 char *loc = NULL; 497 char *q; 498 int c = 0; 499 int saveherefd = herefd; 500 struct nodelist *saveargbackq = argbackq; 501 int amount; 502 503 herefd = -1; 504 argstr(p, 0); 505 STACKSTRNUL(expdest); 506 herefd = saveherefd; 507 argbackq = saveargbackq; 508 startp = stackblock() + startloc; 509 if (str == NULL) 510 str = stackblock() + strloc; 511 512 switch (subtype) { 513 case VSASSIGN: 514 setvar(str, startp, 0); 515 amount = startp - expdest; 516 STADJUST(amount, expdest); 517 varflags &= ~VSNUL; 518 if (c != 0) 519 *loc = c; 520 return 1; 521 522 case VSQUESTION: 523 if (*p != CTLENDVAR) { 524 outfmt(&errout, "%s\n", startp); 525 error((char *)NULL); 526 } 527 error("%.*s: parameter %snot set", (int)(p - str - 1), 528 str, (varflags & VSNUL) ? "null or " 529 : nullstr); 530 return 0; 531 532 case VSTRIMLEFT: 533 for (loc = startp; loc < str; loc++) { 534 c = *loc; 535 *loc = '\0'; 536 if (patmatch(str, startp, varflags & VSQUOTE)) { 537 *loc = c; 538 goto recordleft; 539 } 540 *loc = c; 541 if ((varflags & VSQUOTE) && *loc == CTLESC) 542 loc++; 543 } 544 return 0; 545 546 case VSTRIMLEFTMAX: 547 for (loc = str - 1; loc >= startp;) { 548 c = *loc; 549 *loc = '\0'; 550 if (patmatch(str, startp, varflags & VSQUOTE)) { 551 *loc = c; 552 goto recordleft; 553 } 554 *loc = c; 555 loc--; 556 if ((varflags & VSQUOTE) && loc > startp && 557 *(loc - 1) == CTLESC) { 558 for (q = startp; q < loc; q++) 559 if (*q == CTLESC) 560 q++; 561 if (q > loc) 562 loc--; 563 } 564 } 565 return 0; 566 567 case VSTRIMRIGHT: 568 for (loc = str - 1; loc >= startp;) { 569 if (patmatch(str, loc, varflags & VSQUOTE)) { 570 amount = loc - expdest; 571 STADJUST(amount, expdest); 572 return 1; 573 } 574 loc--; 575 if ((varflags & VSQUOTE) && loc > startp && 576 *(loc - 1) == CTLESC) { 577 for (q = startp; q < loc; q++) 578 if (*q == CTLESC) 579 q++; 580 if (q > loc) 581 loc--; 582 } 583 } 584 return 0; 585 586 case VSTRIMRIGHTMAX: 587 for (loc = startp; loc < str - 1; loc++) { 588 if (patmatch(str, loc, varflags & VSQUOTE)) { 589 amount = loc - expdest; 590 STADJUST(amount, expdest); 591 return 1; 592 } 593 if ((varflags & VSQUOTE) && *loc == CTLESC) 594 loc++; 595 } 596 return 0; 597 598 599 default: 600 abort(); 601 } 602 603 recordleft: 604 amount = ((str - 1) - (loc - startp)) - expdest; 605 STADJUST(amount, expdest); 606 while (loc != str - 1) 607 *startp++ = *loc++; 608 return 1; 609 } 610 611 612 /* 613 * Expand a variable, and return a pointer to the next character in the 614 * input string. 615 */ 616 617 STATIC char * 618 evalvar(char *p, int flag) 619 { 620 int subtype; 621 int varflags; 622 char *var; 623 char *val; 624 int patloc; 625 int c; 626 int set; 627 int special; 628 int startloc; 629 int varlen; 630 int easy; 631 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 632 633 varflags = (unsigned char)*p++; 634 subtype = varflags & VSTYPE; 635 var = p; 636 special = 0; 637 if (! is_name(*p)) 638 special = 1; 639 p = strchr(p, '=') + 1; 640 again: /* jump here after setting a variable with ${var=text} */ 641 if (varflags & VSLINENO) { 642 set = 1; 643 special = 0; 644 val = var; 645 p[-1] = '\0'; /* temporarily overwrite '=' to have \0 646 terminated string */ 647 } else if (special) { 648 set = varisset(var, varflags & VSNUL); 649 val = NULL; 650 } else { 651 val = bltinlookup(var, 1); 652 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 653 val = NULL; 654 set = 0; 655 } else 656 set = 1; 657 } 658 varlen = 0; 659 startloc = expdest - stackblock(); 660 if (!set && uflag && *var != '@' && *var != '*') { 661 switch (subtype) { 662 case VSNORMAL: 663 case VSTRIMLEFT: 664 case VSTRIMLEFTMAX: 665 case VSTRIMRIGHT: 666 case VSTRIMRIGHTMAX: 667 case VSLENGTH: 668 error("%.*s: parameter not set", (int)(p - var - 1), 669 var); 670 } 671 } 672 if (set && subtype != VSPLUS) { 673 /* insert the value of the variable */ 674 if (special) { 675 varvalue(var, varflags & VSQUOTE, subtype, flag); 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 case VSERROR: 770 c = p - var - 1; 771 error("${%.*s%s}: Bad substitution", c, var, 772 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 773 774 default: 775 abort(); 776 } 777 p[-1] = '='; /* recover overwritten '=' */ 778 779 if (subtype != VSNORMAL) { /* skip to end of alternative */ 780 int nesting = 1; 781 for (;;) { 782 if ((c = *p++) == CTLESC) 783 p++; 784 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 785 if (set) 786 argbackq = argbackq->next; 787 } else if (c == CTLVAR) { 788 if ((*p++ & VSTYPE) != VSNORMAL) 789 nesting++; 790 } else if (c == CTLENDVAR) { 791 if (--nesting == 0) 792 break; 793 } 794 } 795 } 796 return p; 797 } 798 799 800 801 /* 802 * Test whether a specialized variable is set. 803 */ 804 805 STATIC int 806 varisset(char *name, int nulok) 807 { 808 809 if (*name == '!') 810 return backgndpid != -1; 811 else if (*name == '@' || *name == '*') { 812 if (*shellparam.p == NULL) 813 return 0; 814 815 if (nulok) { 816 char **av; 817 818 for (av = shellparam.p; *av; av++) 819 if (**av != '\0') 820 return 1; 821 return 0; 822 } 823 } else if (is_digit(*name)) { 824 char *ap; 825 int num = atoi(name); 826 827 if (num > shellparam.nparam) 828 return 0; 829 830 if (num == 0) 831 ap = arg0; 832 else 833 ap = shellparam.p[num - 1]; 834 835 if (nulok && (ap == NULL || *ap == '\0')) 836 return 0; 837 } 838 return 1; 839 } 840 841 842 843 /* 844 * Add the value of a specialized variable to the stack string. 845 */ 846 847 STATIC void 848 varvalue(char *name, int quoted, int subtype, int flag) 849 { 850 int num; 851 char *p; 852 int i; 853 extern int oexitstatus; 854 char sep; 855 char **ap; 856 char const *syntax; 857 858 #define STRTODEST(p) \ 859 do {\ 860 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) { \ 861 syntax = quoted? DQSYNTAX : BASESYNTAX; \ 862 while (*p) { \ 863 if (syntax[(int)*p] == CCTL) \ 864 STPUTC(CTLESC, expdest); \ 865 STPUTC(*p++, expdest); \ 866 } \ 867 } else \ 868 while (*p) \ 869 STPUTC(*p++, expdest); \ 870 } while (0) 871 872 873 switch (*name) { 874 case '$': 875 num = rootpid; 876 goto numvar; 877 case '?': 878 num = oexitstatus; 879 goto numvar; 880 case '#': 881 num = shellparam.nparam; 882 goto numvar; 883 case '!': 884 num = backgndpid; 885 numvar: 886 expdest = cvtnum(num, expdest); 887 break; 888 case '-': 889 for (i = 0 ; i < NOPTS ; i++) { 890 if (optlist[i].val) 891 STPUTC(optlist[i].letter, expdest); 892 } 893 break; 894 case '@': 895 if (flag & EXP_FULL && quoted) { 896 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 897 STRTODEST(p); 898 if (*ap) 899 STPUTC('\0', expdest); 900 } 901 break; 902 } 903 /* FALLTHROUGH */ 904 case '*': 905 if (ifsset()) 906 sep = ifsval()[0]; 907 else 908 sep = ' '; 909 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 910 STRTODEST(p); 911 if (*ap && sep) 912 STPUTC(sep, expdest); 913 } 914 break; 915 case '0': 916 p = arg0; 917 STRTODEST(p); 918 break; 919 default: 920 if (is_digit(*name)) { 921 num = atoi(name); 922 if (num > 0 && num <= shellparam.nparam) { 923 p = shellparam.p[num - 1]; 924 STRTODEST(p); 925 } 926 } 927 break; 928 } 929 } 930 931 932 933 /* 934 * Record the the fact that we have to scan this region of the 935 * string for IFS characters. 936 */ 937 938 STATIC void 939 recordregion(int start, int end, int inquotes) 940 { 941 struct ifsregion *ifsp; 942 943 if (ifslastp == NULL) { 944 ifsp = &ifsfirst; 945 } else { 946 if (ifslastp->endoff == start 947 && ifslastp->inquotes == inquotes) { 948 /* extend previous area */ 949 ifslastp->endoff = end; 950 return; 951 } 952 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 953 ifslastp->next = ifsp; 954 } 955 ifslastp = ifsp; 956 ifslastp->next = NULL; 957 ifslastp->begoff = start; 958 ifslastp->endoff = end; 959 ifslastp->inquotes = inquotes; 960 } 961 962 963 964 /* 965 * Break the argument string into pieces based upon IFS and add the 966 * strings to the argument list. The regions of the string to be 967 * searched for IFS characters have been stored by recordregion. 968 */ 969 STATIC void 970 ifsbreakup(char *string, struct arglist *arglist) 971 { 972 struct ifsregion *ifsp; 973 struct strlist *sp; 974 char *start; 975 char *p; 976 char *q; 977 char *ifs; 978 const char *ifsspc; 979 int had_param_ch = 0; 980 981 start = string; 982 983 if (ifslastp == NULL) { 984 /* Return entire argument, IFS doesn't apply to any of it */ 985 sp = (struct strlist *)stalloc(sizeof *sp); 986 sp->text = start; 987 *arglist->lastp = sp; 988 arglist->lastp = &sp->next; 989 return; 990 } 991 992 ifs = ifsset() ? ifsval() : " \t\n"; 993 994 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 995 p = string + ifsp->begoff; 996 while (p < string + ifsp->endoff) { 997 q = p; 998 if (*p == CTLESC) 999 p++; 1000 if (ifsp->inquotes) { 1001 /* Only NULs (should be from "$@") end args */ 1002 had_param_ch = 1; 1003 if (*p != 0) { 1004 p++; 1005 continue; 1006 } 1007 ifsspc = NULL; 1008 } else { 1009 if (!strchr(ifs, *p)) { 1010 had_param_ch = 1; 1011 p++; 1012 continue; 1013 } 1014 ifsspc = strchr(" \t\n", *p); 1015 1016 /* Ignore IFS whitespace at start */ 1017 if (q == start && ifsspc != NULL) { 1018 p++; 1019 start = p; 1020 continue; 1021 } 1022 had_param_ch = 0; 1023 } 1024 1025 /* Save this argument... */ 1026 *q = '\0'; 1027 sp = (struct strlist *)stalloc(sizeof *sp); 1028 sp->text = start; 1029 *arglist->lastp = sp; 1030 arglist->lastp = &sp->next; 1031 p++; 1032 1033 if (ifsspc != NULL) { 1034 /* Ignore further trailing IFS whitespace */ 1035 for (; p < string + ifsp->endoff; p++) { 1036 q = p; 1037 if (*p == CTLESC) 1038 p++; 1039 if (strchr(ifs, *p) == NULL) { 1040 p = q; 1041 break; 1042 } 1043 if (strchr(" \t\n", *p) == NULL) { 1044 p++; 1045 break; 1046 } 1047 } 1048 } 1049 start = p; 1050 } 1051 } 1052 1053 /* 1054 * Save anything left as an argument. 1055 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1056 * generating 2 arguments, the second of which is empty. 1057 * Some recent clarification of the Posix spec say that it 1058 * should only generate one.... 1059 */ 1060 if (had_param_ch || *start != 0) { 1061 sp = (struct strlist *)stalloc(sizeof *sp); 1062 sp->text = start; 1063 *arglist->lastp = sp; 1064 arglist->lastp = &sp->next; 1065 } 1066 } 1067 1068 1069 1070 /* 1071 * Expand shell metacharacters. At this point, the only control characters 1072 * should be escapes. The results are stored in the list exparg. 1073 */ 1074 1075 STATIC char *expdir; 1076 1077 1078 STATIC void 1079 expandmeta(struct strlist *str, int flag __unused) 1080 { 1081 char *p; 1082 struct strlist **savelastp; 1083 struct strlist *sp; 1084 char c; 1085 /* TODO - EXP_REDIR */ 1086 1087 while (str) { 1088 if (fflag) 1089 goto nometa; 1090 p = str->text; 1091 for (;;) { /* fast check for meta chars */ 1092 if ((c = *p++) == '\0') 1093 goto nometa; 1094 if (c == '*' || c == '?' || c == '[' || c == '!') 1095 break; 1096 } 1097 savelastp = exparg.lastp; 1098 INTOFF; 1099 if (expdir == NULL) { 1100 int i = strlen(str->text); 1101 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ 1102 } 1103 1104 expmeta(expdir, str->text); 1105 ckfree(expdir); 1106 expdir = NULL; 1107 INTON; 1108 if (exparg.lastp == savelastp) { 1109 /* 1110 * no matches 1111 */ 1112 nometa: 1113 *exparg.lastp = str; 1114 rmescapes(str->text); 1115 exparg.lastp = &str->next; 1116 } else { 1117 *exparg.lastp = NULL; 1118 *savelastp = sp = expsort(*savelastp); 1119 while (sp->next != NULL) 1120 sp = sp->next; 1121 exparg.lastp = &sp->next; 1122 } 1123 str = str->next; 1124 } 1125 } 1126 1127 1128 /* 1129 * Do metacharacter (i.e. *, ?, [...]) expansion. 1130 */ 1131 1132 STATIC void 1133 expmeta(char *enddir, char *name) 1134 { 1135 char *p; 1136 char *q; 1137 char *start; 1138 char *endname; 1139 int metaflag; 1140 struct stat statb; 1141 DIR *dirp; 1142 struct dirent *dp; 1143 int atend; 1144 int matchdot; 1145 1146 metaflag = 0; 1147 start = name; 1148 for (p = name ; ; p++) { 1149 if (*p == '*' || *p == '?') 1150 metaflag = 1; 1151 else if (*p == '[') { 1152 q = p + 1; 1153 if (*q == '!' || *q == '^') 1154 q++; 1155 for (;;) { 1156 while (*q == CTLQUOTEMARK) 1157 q++; 1158 if (*q == CTLESC) 1159 q++; 1160 if (*q == '/' || *q == '\0') 1161 break; 1162 if (*++q == ']') { 1163 metaflag = 1; 1164 break; 1165 } 1166 } 1167 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { 1168 metaflag = 1; 1169 } else if (*p == '\0') 1170 break; 1171 else if (*p == CTLQUOTEMARK) 1172 continue; 1173 else if (*p == CTLESC) 1174 p++; 1175 if (*p == '/') { 1176 if (metaflag) 1177 break; 1178 start = p + 1; 1179 } 1180 } 1181 if (metaflag == 0) { /* we've reached the end of the file name */ 1182 if (enddir != expdir) 1183 metaflag++; 1184 for (p = name ; ; p++) { 1185 if (*p == CTLQUOTEMARK) 1186 continue; 1187 if (*p == CTLESC) 1188 p++; 1189 *enddir++ = *p; 1190 if (*p == '\0') 1191 break; 1192 } 1193 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1194 addfname(expdir); 1195 return; 1196 } 1197 endname = p; 1198 if (start != name) { 1199 p = name; 1200 while (p < start) { 1201 while (*p == CTLQUOTEMARK) 1202 p++; 1203 if (*p == CTLESC) 1204 p++; 1205 *enddir++ = *p++; 1206 } 1207 } 1208 if (enddir == expdir) { 1209 p = "."; 1210 } else if (enddir == expdir + 1 && *expdir == '/') { 1211 p = "/"; 1212 } else { 1213 p = expdir; 1214 enddir[-1] = '\0'; 1215 } 1216 if ((dirp = opendir(p)) == NULL) 1217 return; 1218 if (enddir != expdir) 1219 enddir[-1] = '/'; 1220 if (*endname == 0) { 1221 atend = 1; 1222 } else { 1223 atend = 0; 1224 *endname++ = '\0'; 1225 } 1226 matchdot = 0; 1227 p = start; 1228 while (*p == CTLQUOTEMARK) 1229 p++; 1230 if (*p == CTLESC) 1231 p++; 1232 if (*p == '.') 1233 matchdot++; 1234 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1235 if (dp->d_name[0] == '.' && ! matchdot) 1236 continue; 1237 if (patmatch(start, dp->d_name, 0)) { 1238 if (atend) { 1239 scopy(dp->d_name, enddir); 1240 addfname(expdir); 1241 } else { 1242 for (p = enddir, q = dp->d_name; 1243 (*p++ = *q++) != '\0';) 1244 continue; 1245 p[-1] = '/'; 1246 expmeta(p, endname); 1247 } 1248 } 1249 } 1250 closedir(dirp); 1251 if (! atend) 1252 endname[-1] = '/'; 1253 } 1254 1255 1256 /* 1257 * Add a file name to the list. 1258 */ 1259 1260 STATIC void 1261 addfname(char *name) 1262 { 1263 char *p; 1264 struct strlist *sp; 1265 1266 p = stalloc(strlen(name) + 1); 1267 scopy(name, p); 1268 sp = (struct strlist *)stalloc(sizeof *sp); 1269 sp->text = p; 1270 *exparg.lastp = sp; 1271 exparg.lastp = &sp->next; 1272 } 1273 1274 1275 /* 1276 * Sort the results of file name expansion. It calculates the number of 1277 * strings to sort and then calls msort (short for merge sort) to do the 1278 * work. 1279 */ 1280 1281 STATIC struct strlist * 1282 expsort(struct strlist *str) 1283 { 1284 int len; 1285 struct strlist *sp; 1286 1287 len = 0; 1288 for (sp = str ; sp ; sp = sp->next) 1289 len++; 1290 return msort(str, len); 1291 } 1292 1293 1294 STATIC struct strlist * 1295 msort(struct strlist *list, int len) 1296 { 1297 struct strlist *p, *q = NULL; 1298 struct strlist **lpp; 1299 int half; 1300 int n; 1301 1302 if (len <= 1) 1303 return list; 1304 half = len >> 1; 1305 p = list; 1306 for (n = half ; --n >= 0 ; ) { 1307 q = p; 1308 p = p->next; 1309 } 1310 q->next = NULL; /* terminate first half of list */ 1311 q = msort(list, half); /* sort first half of list */ 1312 p = msort(p, len - half); /* sort second half */ 1313 lpp = &list; 1314 for (;;) { 1315 if (strcmp(p->text, q->text) < 0) { 1316 *lpp = p; 1317 lpp = &p->next; 1318 if ((p = *lpp) == NULL) { 1319 *lpp = q; 1320 break; 1321 } 1322 } else { 1323 *lpp = q; 1324 lpp = &q->next; 1325 if ((q = *lpp) == NULL) { 1326 *lpp = p; 1327 break; 1328 } 1329 } 1330 } 1331 return list; 1332 } 1333 1334 1335 1336 /* 1337 * Returns true if the pattern matches the string. 1338 */ 1339 1340 int 1341 patmatch(char *pattern, char *string, int squoted) 1342 { 1343 #ifdef notdef 1344 if (pattern[0] == '!' && pattern[1] == '!') 1345 return 1 - pmatch(pattern + 2, string); 1346 else 1347 #endif 1348 return pmatch(pattern, string, squoted); 1349 } 1350 1351 1352 STATIC int 1353 pmatch(char *pattern, char *string, int squoted) 1354 { 1355 char *p, *q; 1356 char c; 1357 1358 p = pattern; 1359 q = string; 1360 for (;;) { 1361 switch (c = *p++) { 1362 case '\0': 1363 goto breakloop; 1364 case CTLESC: 1365 if (squoted && *q == CTLESC) 1366 q++; 1367 if (*q++ != *p++) 1368 return 0; 1369 break; 1370 case CTLQUOTEMARK: 1371 continue; 1372 case '?': 1373 if (squoted && *q == CTLESC) 1374 q++; 1375 if (*q++ == '\0') 1376 return 0; 1377 break; 1378 case '*': 1379 c = *p; 1380 while (c == CTLQUOTEMARK || c == '*') 1381 c = *++p; 1382 if (c != CTLESC && c != CTLQUOTEMARK && 1383 c != '?' && c != '*' && c != '[') { 1384 while (*q != c) { 1385 if (squoted && *q == CTLESC && 1386 q[1] == c) 1387 break; 1388 if (*q == '\0') 1389 return 0; 1390 if (squoted && *q == CTLESC) 1391 q++; 1392 q++; 1393 } 1394 } 1395 do { 1396 if (pmatch(p, q, squoted)) 1397 return 1; 1398 if (squoted && *q == CTLESC) 1399 q++; 1400 } while (*q++ != '\0'); 1401 return 0; 1402 case '[': { 1403 char *endp; 1404 int invert, found; 1405 char chr; 1406 1407 endp = p; 1408 if (*endp == '!' || *endp == '^') 1409 endp++; 1410 for (;;) { 1411 while (*endp == CTLQUOTEMARK) 1412 endp++; 1413 if (*endp == '\0') 1414 goto dft; /* no matching ] */ 1415 if (*endp == CTLESC) 1416 endp++; 1417 if (*++endp == ']') 1418 break; 1419 } 1420 invert = 0; 1421 if (*p == '!' || *p == '^') { 1422 invert++; 1423 p++; 1424 } 1425 found = 0; 1426 chr = *q++; 1427 if (squoted && chr == CTLESC) 1428 chr = *q++; 1429 if (chr == '\0') 1430 return 0; 1431 c = *p++; 1432 do { 1433 if (c == CTLQUOTEMARK) 1434 continue; 1435 if (c == CTLESC) 1436 c = *p++; 1437 if (*p == '-' && p[1] != ']') { 1438 p++; 1439 while (*p == CTLQUOTEMARK) 1440 p++; 1441 if (*p == CTLESC) 1442 p++; 1443 if ( collate_range_cmp(chr, c) >= 0 1444 && collate_range_cmp(chr, *p) <= 0 1445 ) 1446 found = 1; 1447 p++; 1448 } else { 1449 if (chr == c) 1450 found = 1; 1451 } 1452 } while ((c = *p++) != ']'); 1453 if (found == invert) 1454 return 0; 1455 break; 1456 } 1457 dft: default: 1458 if (squoted && *q == CTLESC) 1459 q++; 1460 if (*q++ != c) 1461 return 0; 1462 break; 1463 } 1464 } 1465 breakloop: 1466 if (*q != '\0') 1467 return 0; 1468 return 1; 1469 } 1470 1471 1472 1473 /* 1474 * Remove any CTLESC characters from a string. 1475 */ 1476 1477 void 1478 rmescapes(char *str) 1479 { 1480 char *p, *q; 1481 1482 p = str; 1483 while (*p != CTLESC && *p != CTLQUOTEMARK) { 1484 if (*p++ == '\0') 1485 return; 1486 } 1487 q = p; 1488 while (*p) { 1489 if (*p == CTLQUOTEMARK) { 1490 p++; 1491 continue; 1492 } 1493 if (*p == CTLESC) 1494 p++; 1495 *q++ = *p++; 1496 } 1497 *q = '\0'; 1498 } 1499 1500 1501 1502 /* 1503 * See if a pattern matches in a case statement. 1504 */ 1505 1506 int 1507 casematch(union node *pattern, char *val) 1508 { 1509 struct stackmark smark; 1510 int result; 1511 char *p; 1512 1513 setstackmark(&smark); 1514 argbackq = pattern->narg.backquote; 1515 STARTSTACKSTR(expdest); 1516 ifslastp = NULL; 1517 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1518 STPUTC('\0', expdest); 1519 p = grabstackstr(expdest); 1520 result = patmatch(p, val, 0); 1521 popstackmark(&smark); 1522 return result; 1523 } 1524 1525 /* 1526 * Our own itoa(). 1527 */ 1528 1529 STATIC char * 1530 cvtnum(int num, char *buf) 1531 { 1532 char temp[32]; 1533 int neg = num < 0; 1534 char *p = temp + 31; 1535 1536 temp[31] = '\0'; 1537 1538 do { 1539 *--p = num % 10 + '0'; 1540 } while ((num /= 10) != 0); 1541 1542 if (neg) 1543 *--p = '-'; 1544 1545 while (*p) 1546 STPUTC(*p++, buf); 1547 return buf; 1548 } 1549 1550 /* 1551 * Do most of the work for wordexp(3). 1552 */ 1553 1554 int 1555 wordexpcmd(int argc, char **argv) 1556 { 1557 size_t len; 1558 int i; 1559 1560 out1fmt("%08x", argc - 1); 1561 for (i = 1, len = 0; i < argc; i++) 1562 len += strlen(argv[i]); 1563 out1fmt("%08x", (int)len); 1564 for (i = 1; i < argc; i++) { 1565 out1str(argv[i]); 1566 out1c('\0'); 1567 } 1568 return (0); 1569 } 1570