1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1997-2005 5 * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. 6 * Copyright (c) 2010-2015 7 * Jilles Tjoelker <jilles@stack.nl>. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Kenneth Almquist. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. 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: head/bin/sh/expand.c 341164 2018-11-28 20:03:53Z jilles $"); 44 45 #include <sys/types.h> 46 #include <sys/time.h> 47 #include <sys/stat.h> 48 #include <dirent.h> 49 #include <errno.h> 50 #include <inttypes.h> 51 #include <limits.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <wchar.h> 58 #include <wctype.h> 59 60 /* 61 * Routines to expand arguments to commands. We have to deal with 62 * backquotes, shell variables, and file metacharacters. 63 */ 64 65 #include "shell.h" 66 #include "main.h" 67 #include "nodes.h" 68 #include "eval.h" 69 #include "expand.h" 70 #include "syntax.h" 71 #include "parser.h" 72 #include "jobs.h" 73 #include "options.h" 74 #include "var.h" 75 #include "input.h" 76 #include "output.h" 77 #include "memalloc.h" 78 #include "error.h" 79 #include "mystring.h" 80 #include "arith.h" 81 #include "show.h" 82 #include "builtins.h" 83 84 enum wordstate { WORD_IDLE, WORD_WS_DELIMITED, WORD_QUOTEMARK }; 85 86 struct worddest { 87 struct arglist *list; 88 enum wordstate state; 89 }; 90 91 static char *expdest; /* output of current string */ 92 93 static const char *argstr(const char *, struct nodelist **restrict, int, 94 struct worddest *); 95 static const char *exptilde(const char *, int); 96 static const char *expari(const char *, struct nodelist **restrict, int, 97 struct worddest *); 98 static void expbackq(union node *, int, int, struct worddest *); 99 static const char *subevalvar_trim(const char *, struct nodelist **restrict, 100 int, int, int); 101 static const char *subevalvar_misc(const char *, struct nodelist **restrict, 102 const char *, int, int, int); 103 static const char *evalvar(const char *, struct nodelist **restrict, int, 104 struct worddest *); 105 static int varisset(const char *, int); 106 static void strtodest(const char *, int, int, int, struct worddest *); 107 static void reprocess(int, int, int, int, struct worddest *); 108 static void varvalue(const char *, int, int, int, struct worddest *); 109 static void expandmeta(char *, struct arglist *); 110 static void expmeta(char *, char *, struct arglist *); 111 static int expsortcmp(const void *, const void *); 112 static int patmatch(const char *, const char *); 113 static void cvtnum(int, char *); 114 static int collate_range_cmp(wchar_t, wchar_t); 115 116 void 117 emptyarglist(struct arglist *list) 118 { 119 120 list->args = list->smallarg; 121 list->count = 0; 122 list->capacity = sizeof(list->smallarg) / sizeof(list->smallarg[0]); 123 } 124 125 void 126 appendarglist(struct arglist *list, char *str) 127 { 128 char **newargs; 129 int newcapacity; 130 131 if (list->count >= list->capacity) { 132 newcapacity = list->capacity * 2; 133 if (newcapacity < 16) 134 newcapacity = 16; 135 if (newcapacity > INT_MAX / (int)sizeof(newargs[0])) 136 error("Too many entries in arglist"); 137 newargs = stalloc(newcapacity * sizeof(newargs[0])); 138 memcpy(newargs, list->args, list->count * sizeof(newargs[0])); 139 list->args = newargs; 140 list->capacity = newcapacity; 141 } 142 list->args[list->count++] = str; 143 } 144 145 static int 146 collate_range_cmp(wchar_t c1, wchar_t c2) 147 { 148 wchar_t s1[2], s2[2]; 149 150 s1[0] = c1; 151 s1[1] = L'\0'; 152 s2[0] = c2; 153 s2[1] = L'\0'; 154 return (wcscoll(s1, s2)); 155 } 156 157 static char * 158 stputs_quotes(const char *data, const char *syntax, char *p) 159 { 160 while (*data) { 161 CHECKSTRSPACE(2, p); 162 if (syntax[(int)*data] == CCTL) 163 USTPUTC(CTLESC, p); 164 USTPUTC(*data++, p); 165 } 166 return (p); 167 } 168 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) 169 170 static char * 171 nextword(char c, int flag, char *p, struct worddest *dst) 172 { 173 int is_ws; 174 175 is_ws = c == '\t' || c == '\n' || c == ' '; 176 if (p != stackblock() || (is_ws ? dst->state == WORD_QUOTEMARK : 177 dst->state != WORD_WS_DELIMITED) || c == '\0') { 178 STPUTC('\0', p); 179 if (flag & EXP_GLOB) 180 expandmeta(grabstackstr(p), dst->list); 181 else 182 appendarglist(dst->list, grabstackstr(p)); 183 dst->state = is_ws ? WORD_WS_DELIMITED : WORD_IDLE; 184 } else if (!is_ws && dst->state == WORD_WS_DELIMITED) 185 dst->state = WORD_IDLE; 186 /* Reserve space while the stack string is empty. */ 187 appendarglist(dst->list, NULL); 188 dst->list->count--; 189 STARTSTACKSTR(p); 190 return p; 191 } 192 #define NEXTWORD(c, flag, p, dstlist) p = nextword(c, flag, p, dstlist) 193 194 static char * 195 stputs_split(const char *data, const char *syntax, int flag, char *p, 196 struct worddest *dst) 197 { 198 const char *ifs; 199 char c; 200 201 ifs = ifsset() ? ifsval() : " \t\n"; 202 while (*data) { 203 CHECKSTRSPACE(2, p); 204 c = *data++; 205 if (strchr(ifs, c) != NULL) { 206 NEXTWORD(c, flag, p, dst); 207 continue; 208 } 209 if (flag & EXP_GLOB && syntax[(int)c] == CCTL) 210 USTPUTC(CTLESC, p); 211 USTPUTC(c, p); 212 } 213 return (p); 214 } 215 #define STPUTS_SPLIT(data, syntax, flag, p, dst) p = stputs_split((data), syntax, flag, p, dst) 216 217 /* 218 * Perform expansions on an argument, placing the resulting list of arguments 219 * in arglist. Parameter expansion, command substitution and arithmetic 220 * expansion are always performed; additional expansions can be requested 221 * via flag (EXP_*). 222 * The result is left in the stack string. 223 * When arglist is NULL, perform here document expansion. 224 * 225 * When doing something that may cause this to be re-entered, make sure 226 * the stack string is empty via grabstackstr() and do not assume expdest 227 * remains valid. 228 */ 229 void 230 expandarg(union node *arg, struct arglist *arglist, int flag) 231 { 232 struct worddest exparg; 233 struct nodelist *argbackq; 234 235 if (fflag) 236 flag &= ~EXP_GLOB; 237 argbackq = arg->narg.backquote; 238 exparg.list = arglist; 239 exparg.state = WORD_IDLE; 240 STARTSTACKSTR(expdest); 241 argstr(arg->narg.text, &argbackq, flag, &exparg); 242 if (arglist == NULL) { 243 STACKSTRNUL(expdest); 244 return; /* here document expanded */ 245 } 246 if ((flag & EXP_SPLIT) == 0 || expdest != stackblock() || 247 exparg.state == WORD_QUOTEMARK) { 248 STPUTC('\0', expdest); 249 if (flag & EXP_SPLIT) { 250 if (flag & EXP_GLOB) 251 expandmeta(grabstackstr(expdest), exparg.list); 252 else 253 appendarglist(exparg.list, grabstackstr(expdest)); 254 } 255 } 256 if ((flag & EXP_SPLIT) == 0) 257 appendarglist(arglist, grabstackstr(expdest)); 258 } 259 260 261 262 /* 263 * Perform parameter expansion, command substitution and arithmetic 264 * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 265 * Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'. 266 * This is used to expand word in ${var+word} etc. 267 * If EXP_GLOB or EXP_CASE are set, keep and/or generate CTLESC 268 * characters to allow for further processing. 269 * 270 * If EXP_SPLIT is set, dst receives any complete words produced. 271 */ 272 static const char * 273 argstr(const char *p, struct nodelist **restrict argbackq, int flag, 274 struct worddest *dst) 275 { 276 char c; 277 int quotes = flag & (EXP_GLOB | EXP_CASE); /* do CTLESC */ 278 int firsteq = 1; 279 int split_lit; 280 int lit_quoted; 281 282 split_lit = flag & EXP_SPLIT_LIT; 283 lit_quoted = flag & EXP_LIT_QUOTED; 284 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 285 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 286 p = exptilde(p, flag); 287 for (;;) { 288 CHECKSTRSPACE(2, expdest); 289 switch (c = *p++) { 290 case '\0': 291 return (p - 1); 292 case CTLENDVAR: 293 case CTLENDARI: 294 return (p); 295 case CTLQUOTEMARK: 296 lit_quoted = 1; 297 /* "$@" syntax adherence hack */ 298 if (p[0] == CTLVAR && (p[1] & VSQUOTE) != 0 && 299 p[2] == '@' && p[3] == '=') 300 break; 301 if ((flag & EXP_SPLIT) != 0 && expdest == stackblock()) 302 dst->state = WORD_QUOTEMARK; 303 break; 304 case CTLQUOTEEND: 305 lit_quoted = 0; 306 break; 307 case CTLESC: 308 c = *p++; 309 if (split_lit && !lit_quoted && 310 strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) { 311 NEXTWORD(c, flag, expdest, dst); 312 break; 313 } 314 if (quotes) 315 USTPUTC(CTLESC, expdest); 316 USTPUTC(c, expdest); 317 break; 318 case CTLVAR: 319 p = evalvar(p, argbackq, flag, dst); 320 break; 321 case CTLBACKQ: 322 case CTLBACKQ|CTLQUOTE: 323 expbackq((*argbackq)->n, c & CTLQUOTE, flag, dst); 324 *argbackq = (*argbackq)->next; 325 break; 326 case CTLARI: 327 p = expari(p, argbackq, flag, dst); 328 break; 329 case ':': 330 case '=': 331 /* 332 * sort of a hack - expand tildes in variable 333 * assignments (after the first '=' and after ':'s). 334 */ 335 if (split_lit && !lit_quoted && 336 strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) { 337 NEXTWORD(c, flag, expdest, dst); 338 break; 339 } 340 USTPUTC(c, expdest); 341 if (flag & EXP_VARTILDE && *p == '~' && 342 (c != '=' || firsteq)) { 343 if (c == '=') 344 firsteq = 0; 345 p = exptilde(p, flag); 346 } 347 break; 348 default: 349 if (split_lit && !lit_quoted && 350 strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) { 351 NEXTWORD(c, flag, expdest, dst); 352 break; 353 } 354 USTPUTC(c, expdest); 355 } 356 } 357 } 358 359 /* 360 * Perform tilde expansion, placing the result in the stack string and 361 * returning the next position in the input string to process. 362 */ 363 static const char * 364 exptilde(const char *p, int flag) 365 { 366 char c; 367 const char *startp = p; 368 const char *user; 369 struct passwd *pw; 370 char *home; 371 int len; 372 373 for (;;) { 374 c = *p; 375 switch(c) { 376 case CTLESC: /* This means CTL* are always considered quoted. */ 377 case CTLVAR: 378 case CTLBACKQ: 379 case CTLBACKQ | CTLQUOTE: 380 case CTLARI: 381 case CTLENDARI: 382 case CTLQUOTEMARK: 383 return (startp); 384 case ':': 385 if ((flag & EXP_VARTILDE) == 0) 386 break; 387 /* FALLTHROUGH */ 388 case '\0': 389 case '/': 390 case CTLENDVAR: 391 len = p - startp - 1; 392 STPUTBIN(startp + 1, len, expdest); 393 STACKSTRNUL(expdest); 394 user = expdest - len; 395 if (*user == '\0') { 396 home = lookupvar("HOME"); 397 } else { 398 pw = getpwnam(user); 399 home = pw != NULL ? pw->pw_dir : NULL; 400 } 401 STADJUST(-len, expdest); 402 if (home == NULL || *home == '\0') 403 return (startp); 404 strtodest(home, flag, VSNORMAL, 1, NULL); 405 return (p); 406 } 407 p++; 408 } 409 } 410 411 412 /* 413 * Expand arithmetic expression. 414 */ 415 static const char * 416 expari(const char *p, struct nodelist **restrict argbackq, int flag, 417 struct worddest *dst) 418 { 419 char *q, *start; 420 arith_t result; 421 int begoff; 422 int quoted; 423 int adj; 424 425 quoted = *p++ == '"'; 426 begoff = expdest - stackblock(); 427 p = argstr(p, argbackq, 0, NULL); 428 STPUTC('\0', expdest); 429 start = stackblock() + begoff; 430 431 q = grabstackstr(expdest); 432 result = arith(start); 433 ungrabstackstr(q, expdest); 434 435 start = stackblock() + begoff; 436 adj = start - expdest; 437 STADJUST(adj, expdest); 438 439 CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest); 440 fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result); 441 adj = strlen(expdest); 442 STADJUST(adj, expdest); 443 /* 444 * If this is quoted, a '-' must not indicate a range in [...]. 445 * If this is not quoted, splitting may occur. 446 */ 447 if (quoted ? 448 result < 0 && begoff > 1 && flag & (EXP_GLOB | EXP_CASE) : 449 flag & EXP_SPLIT) 450 reprocess(expdest - adj - stackblock(), flag, VSNORMAL, quoted, 451 dst); 452 return p; 453 } 454 455 456 /* 457 * Perform command substitution. 458 */ 459 static void 460 expbackq(union node *cmd, int quoted, int flag, struct worddest *dst) 461 { 462 struct backcmd in; 463 int i; 464 char buf[128]; 465 char *p; 466 char *dest = expdest; 467 char lastc; 468 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 469 int quotes = flag & (EXP_GLOB | EXP_CASE); 470 size_t nnl; 471 const char *ifs; 472 int startloc; 473 474 INTOFF; 475 p = grabstackstr(dest); 476 evalbackcmd(cmd, &in); 477 ungrabstackstr(p, dest); 478 479 p = in.buf; 480 startloc = dest - stackblock(); 481 nnl = 0; 482 if (!quoted && flag & EXP_SPLIT) 483 ifs = ifsset() ? ifsval() : " \t\n"; 484 else 485 ifs = ""; 486 /* Remove trailing newlines */ 487 for (;;) { 488 if (--in.nleft < 0) { 489 if (in.fd < 0) 490 break; 491 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR) 492 ; 493 TRACE(("expbackq: read returns %d\n", i)); 494 if (i <= 0) 495 break; 496 p = buf; 497 in.nleft = i - 1; 498 } 499 lastc = *p++; 500 if (lastc == '\0') 501 continue; 502 if (nnl > 0 && lastc != '\n') { 503 NEXTWORD('\n', flag, dest, dst); 504 nnl = 0; 505 } 506 if (strchr(ifs, lastc) != NULL) { 507 if (lastc == '\n') 508 nnl++; 509 else 510 NEXTWORD(lastc, flag, dest, dst); 511 } else { 512 CHECKSTRSPACE(2, dest); 513 if (quotes && syntax[(int)lastc] == CCTL) 514 USTPUTC(CTLESC, dest); 515 USTPUTC(lastc, dest); 516 } 517 } 518 while (dest > stackblock() + startloc && STTOPC(dest) == '\n') 519 STUNPUTC(dest); 520 521 if (in.fd >= 0) 522 close(in.fd); 523 if (in.buf) 524 ckfree(in.buf); 525 if (in.jp) { 526 p = grabstackstr(dest); 527 exitstatus = waitforjob(in.jp, (int *)NULL); 528 ungrabstackstr(p, dest); 529 } 530 TRACE(("expbackq: done\n")); 531 expdest = dest; 532 INTON; 533 } 534 535 536 537 static void 538 recordleft(const char *str, const char *loc, char *startp) 539 { 540 int amount; 541 542 amount = ((str - 1) - (loc - startp)) - expdest; 543 STADJUST(amount, expdest); 544 while (loc != str - 1) 545 *startp++ = *loc++; 546 } 547 548 static const char * 549 subevalvar_trim(const char *p, struct nodelist **restrict argbackq, int strloc, 550 int subtype, int startloc) 551 { 552 char *startp; 553 char *loc = NULL; 554 char *str; 555 int c = 0; 556 int amount; 557 558 p = argstr(p, argbackq, EXP_CASE | EXP_TILDE, NULL); 559 STACKSTRNUL(expdest); 560 startp = stackblock() + startloc; 561 str = stackblock() + strloc; 562 563 switch (subtype) { 564 case VSTRIMLEFT: 565 for (loc = startp; loc < str; loc++) { 566 c = *loc; 567 *loc = '\0'; 568 if (patmatch(str, startp)) { 569 *loc = c; 570 recordleft(str, loc, startp); 571 return p; 572 } 573 *loc = c; 574 } 575 break; 576 577 case VSTRIMLEFTMAX: 578 for (loc = str - 1; loc >= startp;) { 579 c = *loc; 580 *loc = '\0'; 581 if (patmatch(str, startp)) { 582 *loc = c; 583 recordleft(str, loc, startp); 584 return p; 585 } 586 *loc = c; 587 loc--; 588 } 589 break; 590 591 case VSTRIMRIGHT: 592 for (loc = str - 1; loc >= startp;) { 593 if (patmatch(str, loc)) { 594 amount = loc - expdest; 595 STADJUST(amount, expdest); 596 return p; 597 } 598 loc--; 599 } 600 break; 601 602 case VSTRIMRIGHTMAX: 603 for (loc = startp; loc < str - 1; loc++) { 604 if (patmatch(str, loc)) { 605 amount = loc - expdest; 606 STADJUST(amount, expdest); 607 return p; 608 } 609 } 610 break; 611 612 613 default: 614 abort(); 615 } 616 amount = (expdest - stackblock() - strloc) + 1; 617 STADJUST(-amount, expdest); 618 return p; 619 } 620 621 622 static const char * 623 subevalvar_misc(const char *p, struct nodelist **restrict argbackq, 624 const char *var, int subtype, int startloc, int varflags) 625 { 626 const char *end; 627 char *startp; 628 int amount; 629 630 end = argstr(p, argbackq, EXP_TILDE, NULL); 631 STACKSTRNUL(expdest); 632 startp = stackblock() + startloc; 633 634 switch (subtype) { 635 case VSASSIGN: 636 setvar(var, startp, 0); 637 amount = startp - expdest; 638 STADJUST(amount, expdest); 639 return end; 640 641 case VSQUESTION: 642 if (*p != CTLENDVAR) { 643 outfmt(out2, "%s\n", startp); 644 error((char *)NULL); 645 } 646 error("%.*s: parameter %snot set", (int)(p - var - 1), 647 var, (varflags & VSNUL) ? "null or " : ""); 648 649 default: 650 abort(); 651 } 652 } 653 654 655 /* 656 * Expand a variable, and return a pointer to the next character in the 657 * input string. 658 */ 659 660 static const char * 661 evalvar(const char *p, struct nodelist **restrict argbackq, int flag, 662 struct worddest *dst) 663 { 664 int subtype; 665 int varflags; 666 const char *var; 667 const char *val; 668 int patloc; 669 int c; 670 int set; 671 int special; 672 int startloc; 673 int varlen; 674 int varlenb; 675 char buf[21]; 676 677 varflags = (unsigned char)*p++; 678 subtype = varflags & VSTYPE; 679 var = p; 680 special = 0; 681 if (! is_name(*p)) 682 special = 1; 683 p = strchr(p, '=') + 1; 684 if (varflags & VSLINENO) { 685 set = 1; 686 special = 1; 687 val = NULL; 688 } else if (special) { 689 set = varisset(var, varflags & VSNUL); 690 val = NULL; 691 } else { 692 val = bltinlookup(var, 1); 693 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 694 val = NULL; 695 set = 0; 696 } else 697 set = 1; 698 } 699 varlen = 0; 700 startloc = expdest - stackblock(); 701 if (!set && uflag && *var != '@' && *var != '*') { 702 switch (subtype) { 703 case VSNORMAL: 704 case VSTRIMLEFT: 705 case VSTRIMLEFTMAX: 706 case VSTRIMRIGHT: 707 case VSTRIMRIGHTMAX: 708 case VSLENGTH: 709 error("%.*s: parameter not set", (int)(p - var - 1), 710 var); 711 } 712 } 713 if (set && subtype != VSPLUS) { 714 /* insert the value of the variable */ 715 if (special) { 716 if (varflags & VSLINENO) { 717 if (p - var > (ptrdiff_t)sizeof(buf)) 718 abort(); 719 memcpy(buf, var, p - var - 1); 720 buf[p - var - 1] = '\0'; 721 strtodest(buf, flag, subtype, 722 varflags & VSQUOTE, dst); 723 } else 724 varvalue(var, varflags & VSQUOTE, subtype, flag, 725 dst); 726 if (subtype == VSLENGTH) { 727 varlenb = expdest - stackblock() - startloc; 728 varlen = varlenb; 729 if (localeisutf8) { 730 val = stackblock() + startloc; 731 for (;val != expdest; val++) 732 if ((*val & 0xC0) == 0x80) 733 varlen--; 734 } 735 STADJUST(-varlenb, expdest); 736 } 737 } else { 738 if (subtype == VSLENGTH) { 739 for (;*val; val++) 740 if (!localeisutf8 || 741 (*val & 0xC0) != 0x80) 742 varlen++; 743 } 744 else 745 strtodest(val, flag, subtype, 746 varflags & VSQUOTE, dst); 747 } 748 } 749 750 if (subtype == VSPLUS) 751 set = ! set; 752 753 switch (subtype) { 754 case VSLENGTH: 755 cvtnum(varlen, buf); 756 strtodest(buf, flag, VSNORMAL, varflags & VSQUOTE, dst); 757 break; 758 759 case VSNORMAL: 760 return p; 761 762 case VSPLUS: 763 case VSMINUS: 764 if (!set) { 765 return argstr(p, argbackq, 766 flag | (flag & EXP_SPLIT ? EXP_SPLIT_LIT : 0) | 767 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0), dst); 768 } 769 break; 770 771 case VSTRIMLEFT: 772 case VSTRIMLEFTMAX: 773 case VSTRIMRIGHT: 774 case VSTRIMRIGHTMAX: 775 if (!set) 776 break; 777 /* 778 * Terminate the string and start recording the pattern 779 * right after it 780 */ 781 STPUTC('\0', expdest); 782 patloc = expdest - stackblock(); 783 p = subevalvar_trim(p, argbackq, patloc, subtype, startloc); 784 reprocess(startloc, flag, VSNORMAL, varflags & VSQUOTE, dst); 785 if (flag & EXP_SPLIT && *var == '@' && varflags & VSQUOTE) 786 dst->state = WORD_QUOTEMARK; 787 return p; 788 789 case VSASSIGN: 790 case VSQUESTION: 791 if (!set) { 792 p = subevalvar_misc(p, argbackq, var, subtype, 793 startloc, varflags); 794 /* assert(subtype == VSASSIGN); */ 795 val = lookupvar(var); 796 strtodest(val, flag, subtype, varflags & VSQUOTE, dst); 797 return p; 798 } 799 break; 800 801 case VSERROR: 802 c = p - var - 1; 803 error("${%.*s%s}: Bad substitution", c, var, 804 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 805 806 default: 807 abort(); 808 } 809 810 { /* skip to end of alternative */ 811 int nesting = 1; 812 for (;;) { 813 if ((c = *p++) == CTLESC) 814 p++; 815 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) 816 *argbackq = (*argbackq)->next; 817 else if (c == CTLVAR) { 818 if ((*p++ & VSTYPE) != VSNORMAL) 819 nesting++; 820 } else if (c == CTLENDVAR) { 821 if (--nesting == 0) 822 break; 823 } 824 } 825 } 826 return p; 827 } 828 829 830 831 /* 832 * Test whether a special or positional parameter is set. 833 */ 834 835 static int 836 varisset(const char *name, int nulok) 837 { 838 839 if (*name == '!') 840 return backgndpidset(); 841 else if (*name == '@' || *name == '*') { 842 if (*shellparam.p == NULL) 843 return 0; 844 845 if (nulok) { 846 char **av; 847 848 for (av = shellparam.p; *av; av++) 849 if (**av != '\0') 850 return 1; 851 return 0; 852 } 853 } else if (is_digit(*name)) { 854 char *ap; 855 long num; 856 857 errno = 0; 858 num = strtol(name, NULL, 10); 859 if (errno != 0 || num > shellparam.nparam) 860 return 0; 861 862 if (num == 0) 863 ap = arg0; 864 else 865 ap = shellparam.p[num - 1]; 866 867 if (nulok && (ap == NULL || *ap == '\0')) 868 return 0; 869 } 870 return 1; 871 } 872 873 static void 874 strtodest(const char *p, int flag, int subtype, int quoted, 875 struct worddest *dst) 876 { 877 if (subtype == VSLENGTH || subtype == VSTRIMLEFT || 878 subtype == VSTRIMLEFTMAX || subtype == VSTRIMRIGHT || 879 subtype == VSTRIMRIGHTMAX) 880 STPUTS(p, expdest); 881 else if (flag & EXP_SPLIT && !quoted && dst != NULL) 882 STPUTS_SPLIT(p, BASESYNTAX, flag, expdest, dst); 883 else if (flag & (EXP_GLOB | EXP_CASE)) 884 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 885 else 886 STPUTS(p, expdest); 887 } 888 889 static void 890 reprocess(int startloc, int flag, int subtype, int quoted, 891 struct worddest *dst) 892 { 893 static char *buf = NULL; 894 static size_t buflen = 0; 895 char *startp; 896 size_t len, zpos, zlen; 897 898 startp = stackblock() + startloc; 899 len = expdest - startp; 900 if (len >= SIZE_MAX / 2 || len > PTRDIFF_MAX) 901 abort(); 902 INTOFF; 903 if (len >= buflen) { 904 ckfree(buf); 905 buf = NULL; 906 } 907 if (buflen < 128) 908 buflen = 128; 909 while (len >= buflen) 910 buflen <<= 1; 911 if (buf == NULL) 912 buf = ckmalloc(buflen); 913 INTON; 914 memcpy(buf, startp, len); 915 buf[len] = '\0'; 916 STADJUST(-(ptrdiff_t)len, expdest); 917 for (zpos = 0;;) { 918 zlen = strlen(buf + zpos); 919 strtodest(buf + zpos, flag, subtype, quoted, dst); 920 zpos += zlen + 1; 921 if (zpos == len + 1) 922 break; 923 if (flag & EXP_SPLIT && (quoted || (zlen > 0 && zpos < len))) 924 NEXTWORD('\0', flag, expdest, dst); 925 } 926 } 927 928 /* 929 * Add the value of a special or positional parameter to the stack string. 930 */ 931 932 static void 933 varvalue(const char *name, int quoted, int subtype, int flag, 934 struct worddest *dst) 935 { 936 int num; 937 char *p; 938 int i; 939 int splitlater; 940 char sep[2]; 941 char **ap; 942 char buf[(NSHORTOPTS > 10 ? NSHORTOPTS : 10) + 1]; 943 944 if (subtype == VSLENGTH) 945 flag &= ~EXP_FULL; 946 splitlater = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 947 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX; 948 949 switch (*name) { 950 case '$': 951 num = rootpid; 952 break; 953 case '?': 954 num = oexitstatus; 955 break; 956 case '#': 957 num = shellparam.nparam; 958 break; 959 case '!': 960 num = backgndpidval(); 961 break; 962 case '-': 963 p = buf; 964 for (i = 0 ; i < NSHORTOPTS ; i++) { 965 if (optval[i]) 966 *p++ = optletter[i]; 967 } 968 *p = '\0'; 969 strtodest(buf, flag, subtype, quoted, dst); 970 return; 971 case '@': 972 if (flag & EXP_SPLIT && quoted) { 973 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 974 strtodest(p, flag, subtype, quoted, dst); 975 if (*ap) { 976 if (splitlater) 977 STPUTC('\0', expdest); 978 else 979 NEXTWORD('\0', flag, expdest, 980 dst); 981 } 982 } 983 if (shellparam.nparam > 0) 984 dst->state = WORD_QUOTEMARK; 985 return; 986 } 987 /* FALLTHROUGH */ 988 case '*': 989 if (ifsset()) 990 sep[0] = ifsval()[0]; 991 else 992 sep[0] = ' '; 993 sep[1] = '\0'; 994 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 995 strtodest(p, flag, subtype, quoted, dst); 996 if (!*ap) 997 break; 998 if (sep[0]) 999 strtodest(sep, flag, subtype, quoted, dst); 1000 else if (flag & EXP_SPLIT && !quoted && **ap != '\0') { 1001 if (splitlater) 1002 STPUTC('\0', expdest); 1003 else 1004 NEXTWORD('\0', flag, expdest, dst); 1005 } 1006 } 1007 return; 1008 default: 1009 if (is_digit(*name)) { 1010 num = atoi(name); 1011 if (num == 0) 1012 p = arg0; 1013 else if (num > 0 && num <= shellparam.nparam) 1014 p = shellparam.p[num - 1]; 1015 else 1016 return; 1017 strtodest(p, flag, subtype, quoted, dst); 1018 } 1019 return; 1020 } 1021 cvtnum(num, buf); 1022 strtodest(buf, flag, subtype, quoted, dst); 1023 } 1024 1025 1026 1027 static char expdir[PATH_MAX]; 1028 #define expdir_end (expdir + sizeof(expdir)) 1029 1030 /* 1031 * Perform pathname generation and remove control characters. 1032 * At this point, the only control characters should be CTLESC. 1033 * The results are stored in the list dstlist. 1034 */ 1035 static void 1036 expandmeta(char *pattern, struct arglist *dstlist) 1037 { 1038 char *p; 1039 int firstmatch; 1040 char c; 1041 1042 firstmatch = dstlist->count; 1043 p = pattern; 1044 for (; (c = *p) != '\0'; p++) { 1045 /* fast check for meta chars */ 1046 if (c == '*' || c == '?' || c == '[') { 1047 INTOFF; 1048 expmeta(expdir, pattern, dstlist); 1049 INTON; 1050 break; 1051 } 1052 } 1053 if (dstlist->count == firstmatch) { 1054 /* 1055 * no matches 1056 */ 1057 rmescapes(pattern); 1058 appendarglist(dstlist, pattern); 1059 } else { 1060 qsort(&dstlist->args[firstmatch], 1061 dstlist->count - firstmatch, 1062 sizeof(dstlist->args[0]), expsortcmp); 1063 } 1064 } 1065 1066 1067 /* 1068 * Do metacharacter (i.e. *, ?, [...]) expansion. 1069 */ 1070 1071 static void 1072 expmeta(char *enddir, char *name, struct arglist *arglist) 1073 { 1074 const char *p; 1075 const char *q; 1076 const char *start; 1077 char *endname; 1078 int metaflag; 1079 struct stat statb; 1080 DIR *dirp; 1081 struct dirent *dp; 1082 int atend; 1083 int matchdot; 1084 int esc; 1085 int namlen; 1086 1087 metaflag = 0; 1088 start = name; 1089 for (p = name; esc = 0, *p; p += esc + 1) { 1090 if (*p == '*' || *p == '?') 1091 metaflag = 1; 1092 else if (*p == '[') { 1093 q = p + 1; 1094 if (*q == '!' || *q == '^') 1095 q++; 1096 for (;;) { 1097 if (*q == CTLESC) 1098 q++; 1099 if (*q == '/' || *q == '\0') 1100 break; 1101 if (*++q == ']') { 1102 metaflag = 1; 1103 break; 1104 } 1105 } 1106 } else if (*p == '\0') 1107 break; 1108 else { 1109 if (*p == CTLESC) 1110 esc++; 1111 if (p[esc] == '/') { 1112 if (metaflag) 1113 break; 1114 start = p + esc + 1; 1115 } 1116 } 1117 } 1118 if (metaflag == 0) { /* we've reached the end of the file name */ 1119 if (enddir != expdir) 1120 metaflag++; 1121 for (p = name ; ; p++) { 1122 if (*p == CTLESC) 1123 p++; 1124 *enddir++ = *p; 1125 if (*p == '\0') 1126 break; 1127 if (enddir == expdir_end) 1128 return; 1129 } 1130 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1131 appendarglist(arglist, stsavestr(expdir)); 1132 return; 1133 } 1134 endname = name + (p - name); 1135 if (start != name) { 1136 p = name; 1137 while (p < start) { 1138 if (*p == CTLESC) 1139 p++; 1140 *enddir++ = *p++; 1141 if (enddir == expdir_end) 1142 return; 1143 } 1144 } 1145 if (enddir == expdir) { 1146 p = "."; 1147 } else if (enddir == expdir + 1 && *expdir == '/') { 1148 p = "/"; 1149 } else { 1150 p = expdir; 1151 enddir[-1] = '\0'; 1152 } 1153 if ((dirp = opendir(p)) == NULL) 1154 return; 1155 if (enddir != expdir) 1156 enddir[-1] = '/'; 1157 if (*endname == 0) { 1158 atend = 1; 1159 } else { 1160 atend = 0; 1161 *endname = '\0'; 1162 endname += esc + 1; 1163 } 1164 matchdot = 0; 1165 p = start; 1166 if (*p == CTLESC) 1167 p++; 1168 if (*p == '.') 1169 matchdot++; 1170 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1171 if (dp->d_name[0] == '.' && ! matchdot) 1172 continue; 1173 if (patmatch(start, dp->d_name)) { 1174 #ifdef _DIRENT_HAVE_D_NAMLEN 1175 namlen = dp->d_namlen; 1176 #else 1177 namlen = strlen(dp->d_name); 1178 #endif 1179 if (enddir + namlen + 1 > expdir_end) 1180 continue; 1181 memcpy(enddir, dp->d_name, namlen + 1); 1182 if (atend) 1183 appendarglist(arglist, stsavestr(expdir)); 1184 else { 1185 if (dp->d_type != DT_UNKNOWN && 1186 dp->d_type != DT_DIR && 1187 dp->d_type != DT_LNK) 1188 continue; 1189 if (enddir + namlen + 2 > expdir_end) 1190 continue; 1191 enddir[namlen] = '/'; 1192 enddir[namlen + 1] = '\0'; 1193 expmeta(enddir + namlen + 1, endname, arglist); 1194 } 1195 } 1196 } 1197 closedir(dirp); 1198 if (! atend) 1199 endname[-esc - 1] = esc ? CTLESC : '/'; 1200 } 1201 1202 1203 static int 1204 expsortcmp(const void *p1, const void *p2) 1205 { 1206 const char *s1 = *(const char * const *)p1; 1207 const char *s2 = *(const char * const *)p2; 1208 1209 return (strcoll(s1, s2)); 1210 } 1211 1212 1213 1214 static wchar_t 1215 get_wc(const char **p) 1216 { 1217 wchar_t c; 1218 int chrlen; 1219 1220 chrlen = mbtowc(&c, *p, 4); 1221 if (chrlen == 0) 1222 return 0; 1223 else if (chrlen == -1) 1224 c = 0; 1225 else 1226 *p += chrlen; 1227 return c; 1228 } 1229 1230 1231 /* 1232 * See if a character matches a character class, starting at the first colon 1233 * of "[:class:]". 1234 * If a valid character class is recognized, a pointer to the next character 1235 * after the final closing bracket is stored into *end, otherwise a null 1236 * pointer is stored into *end. 1237 */ 1238 static int 1239 match_charclass(const char *p, wchar_t chr, const char **end) 1240 { 1241 char name[20]; 1242 const char *nameend; 1243 wctype_t cclass; 1244 1245 *end = NULL; 1246 p++; 1247 nameend = strstr(p, ":]"); 1248 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1249 nameend == p) 1250 return 0; 1251 memcpy(name, p, nameend - p); 1252 name[nameend - p] = '\0'; 1253 *end = nameend + 2; 1254 cclass = wctype(name); 1255 /* An unknown class matches nothing but is valid nevertheless. */ 1256 if (cclass == 0) 1257 return 0; 1258 return iswctype(chr, cclass); 1259 } 1260 1261 1262 /* 1263 * Returns true if the pattern matches the string. 1264 */ 1265 1266 static int 1267 patmatch(const char *pattern, const char *string) 1268 { 1269 const char *p, *q, *end; 1270 const char *bt_p, *bt_q; 1271 char c; 1272 wchar_t wc, wc2; 1273 1274 p = pattern; 1275 q = string; 1276 bt_p = NULL; 1277 bt_q = NULL; 1278 for (;;) { 1279 switch (c = *p++) { 1280 case '\0': 1281 if (*q != '\0') 1282 goto backtrack; 1283 return 1; 1284 case CTLESC: 1285 if (*q++ != *p++) 1286 goto backtrack; 1287 break; 1288 case '?': 1289 if (*q == '\0') 1290 return 0; 1291 if (localeisutf8) { 1292 wc = get_wc(&q); 1293 /* 1294 * A '?' does not match invalid UTF-8 but a 1295 * '*' does, so backtrack. 1296 */ 1297 if (wc == 0) 1298 goto backtrack; 1299 } else 1300 q++; 1301 break; 1302 case '*': 1303 c = *p; 1304 while (c == '*') 1305 c = *++p; 1306 /* 1307 * If the pattern ends here, we know the string 1308 * matches without needing to look at the rest of it. 1309 */ 1310 if (c == '\0') 1311 return 1; 1312 /* 1313 * First try the shortest match for the '*' that 1314 * could work. We can forget any earlier '*' since 1315 * there is no way having it match more characters 1316 * can help us, given that we are already here. 1317 */ 1318 bt_p = p; 1319 bt_q = q; 1320 break; 1321 case '[': { 1322 const char *savep, *saveq; 1323 int invert, found; 1324 wchar_t chr; 1325 1326 savep = p, saveq = q; 1327 invert = 0; 1328 if (*p == '!' || *p == '^') { 1329 invert++; 1330 p++; 1331 } 1332 found = 0; 1333 if (*q == '\0') 1334 return 0; 1335 if (localeisutf8) { 1336 chr = get_wc(&q); 1337 if (chr == 0) 1338 goto backtrack; 1339 } else 1340 chr = (unsigned char)*q++; 1341 c = *p++; 1342 do { 1343 if (c == '\0') { 1344 p = savep, q = saveq; 1345 c = '['; 1346 goto dft; 1347 } 1348 if (c == '[' && *p == ':') { 1349 found |= match_charclass(p, chr, &end); 1350 if (end != NULL) { 1351 p = end; 1352 continue; 1353 } 1354 } 1355 if (c == CTLESC) 1356 c = *p++; 1357 if (localeisutf8 && c & 0x80) { 1358 p--; 1359 wc = get_wc(&p); 1360 if (wc == 0) /* bad utf-8 */ 1361 return 0; 1362 } else 1363 wc = (unsigned char)c; 1364 if (*p == '-' && p[1] != ']') { 1365 p++; 1366 if (*p == CTLESC) 1367 p++; 1368 if (localeisutf8) { 1369 wc2 = get_wc(&p); 1370 if (wc2 == 0) /* bad utf-8 */ 1371 return 0; 1372 } else 1373 wc2 = (unsigned char)*p++; 1374 if ( collate_range_cmp(chr, wc) >= 0 1375 && collate_range_cmp(chr, wc2) <= 0 1376 ) 1377 found = 1; 1378 } else { 1379 if (chr == wc) 1380 found = 1; 1381 } 1382 } while ((c = *p++) != ']'); 1383 if (found == invert) 1384 goto backtrack; 1385 break; 1386 } 1387 dft: default: 1388 if (*q == '\0') 1389 return 0; 1390 if (*q++ == c) 1391 break; 1392 backtrack: 1393 /* 1394 * If we have a mismatch (other than hitting the end 1395 * of the string), go back to the last '*' seen and 1396 * have it match one additional character. 1397 */ 1398 if (bt_p == NULL) 1399 return 0; 1400 if (*bt_q == '\0') 1401 return 0; 1402 bt_q++; 1403 p = bt_p; 1404 q = bt_q; 1405 break; 1406 } 1407 } 1408 } 1409 1410 1411 1412 /* 1413 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1414 */ 1415 1416 void 1417 rmescapes(char *str) 1418 { 1419 char *p, *q; 1420 1421 p = str; 1422 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1423 if (*p++ == '\0') 1424 return; 1425 } 1426 q = p; 1427 while (*p) { 1428 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1429 p++; 1430 continue; 1431 } 1432 if (*p == CTLESC) 1433 p++; 1434 *q++ = *p++; 1435 } 1436 *q = '\0'; 1437 } 1438 1439 1440 1441 /* 1442 * See if a pattern matches in a case statement. 1443 */ 1444 1445 int 1446 casematch(union node *pattern, const char *val) 1447 { 1448 struct stackmark smark; 1449 struct nodelist *argbackq; 1450 int result; 1451 char *p; 1452 1453 setstackmark(&smark); 1454 argbackq = pattern->narg.backquote; 1455 STARTSTACKSTR(expdest); 1456 argstr(pattern->narg.text, &argbackq, EXP_TILDE | EXP_CASE, NULL); 1457 STPUTC('\0', expdest); 1458 p = grabstackstr(expdest); 1459 result = patmatch(p, val); 1460 popstackmark(&smark); 1461 return result; 1462 } 1463 1464 /* 1465 * Our own itoa(). 1466 */ 1467 1468 static void 1469 cvtnum(int num, char *buf) 1470 { 1471 char temp[32]; 1472 int neg = num < 0; 1473 char *p = temp + 31; 1474 1475 temp[31] = '\0'; 1476 1477 do { 1478 *--p = num % 10 + '0'; 1479 } while ((num /= 10) != 0); 1480 1481 if (neg) 1482 *--p = '-'; 1483 1484 memcpy(buf, p, temp + 32 - p); 1485 } 1486 1487 /* 1488 * Do most of the work for wordexp(3). 1489 */ 1490 1491 int 1492 wordexpcmd(int argc, char **argv) 1493 { 1494 size_t len; 1495 int i; 1496 1497 out1fmt("%08x", argc - 1); 1498 for (i = 1, len = 0; i < argc; i++) 1499 len += strlen(argv[i]); 1500 out1fmt("%08x", (int)len); 1501 for (i = 1; i < argc; i++) 1502 outbin(argv[i], strlen(argv[i]) + 1, out1); 1503 return (0); 1504 } 1505 1506 /* 1507 * Do most of the work for wordexp(3), new version. 1508 */ 1509 1510 int 1511 wordexp2cmd(int argc __unused, char **argv __unused) 1512 { 1513 struct arglist arglist; 1514 union node *args, *n; 1515 size_t len; 1516 int ch; 1517 int protected = 0; 1518 int fd = -1; 1519 int i; 1520 1521 while ((ch = nextopt("f:p")) != '\0') { 1522 switch (ch) { 1523 case 'f': 1524 fd = number(shoptarg); 1525 break; 1526 case 'p': 1527 protected = 1; 1528 break; 1529 } 1530 } 1531 if (*argptr != NULL) 1532 error("wrong number of arguments"); 1533 if (fd < 0) 1534 error("missing fd"); 1535 INTOFF; 1536 setinputfd(fd, 1); 1537 INTON; 1538 args = parsewordexp(); 1539 popfile(); /* will also close fd */ 1540 if (protected) 1541 for (n = args; n != NULL; n = n->narg.next) { 1542 if (n->narg.backquote != NULL) { 1543 outcslow('C', out1); 1544 error("command substitution disabled"); 1545 } 1546 } 1547 outcslow(' ', out1); 1548 emptyarglist(&arglist); 1549 for (n = args; n != NULL; n = n->narg.next) 1550 expandarg(n, &arglist, EXP_FULL | EXP_TILDE); 1551 for (i = 0, len = 0; i < arglist.count; i++) 1552 len += strlen(arglist.args[i]); 1553 out1fmt("%016x %016zx", arglist.count, len); 1554 for (i = 0; i < arglist.count; i++) 1555 outbin(arglist.args[i], strlen(arglist.args[i]) + 1, out1); 1556 return (0); 1557 } 1558