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("$FreeBSD$"); 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 char *startp; 627 int amount; 628 629 p = argstr(p, argbackq, EXP_TILDE, NULL); 630 STACKSTRNUL(expdest); 631 startp = stackblock() + startloc; 632 633 switch (subtype) { 634 case VSASSIGN: 635 setvar(var, startp, 0); 636 amount = startp - expdest; 637 STADJUST(amount, expdest); 638 return p; 639 640 case VSQUESTION: 641 if (*p != CTLENDVAR) { 642 outfmt(out2, "%s\n", startp); 643 error((char *)NULL); 644 } 645 error("%.*s: parameter %snot set", (int)(p - var - 1), 646 var, (varflags & VSNUL) ? "null or " : ""); 647 648 default: 649 abort(); 650 } 651 } 652 653 654 /* 655 * Expand a variable, and return a pointer to the next character in the 656 * input string. 657 */ 658 659 static const char * 660 evalvar(const char *p, struct nodelist **restrict argbackq, int flag, 661 struct worddest *dst) 662 { 663 int subtype; 664 int varflags; 665 const char *var; 666 const char *val; 667 int patloc; 668 int c; 669 int set; 670 int special; 671 int startloc; 672 int varlen; 673 int varlenb; 674 char buf[21]; 675 676 varflags = (unsigned char)*p++; 677 subtype = varflags & VSTYPE; 678 var = p; 679 special = 0; 680 if (! is_name(*p)) 681 special = 1; 682 p = strchr(p, '=') + 1; 683 if (varflags & VSLINENO) { 684 set = 1; 685 special = 1; 686 val = NULL; 687 } else if (special) { 688 set = varisset(var, varflags & VSNUL); 689 val = NULL; 690 } else { 691 val = bltinlookup(var, 1); 692 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 693 val = NULL; 694 set = 0; 695 } else 696 set = 1; 697 } 698 varlen = 0; 699 startloc = expdest - stackblock(); 700 if (!set && uflag && *var != '@' && *var != '*') { 701 switch (subtype) { 702 case VSNORMAL: 703 case VSTRIMLEFT: 704 case VSTRIMLEFTMAX: 705 case VSTRIMRIGHT: 706 case VSTRIMRIGHTMAX: 707 case VSLENGTH: 708 error("%.*s: parameter not set", (int)(p - var - 1), 709 var); 710 } 711 } 712 if (set && subtype != VSPLUS) { 713 /* insert the value of the variable */ 714 if (special) { 715 if (varflags & VSLINENO) { 716 if (p - var > (ptrdiff_t)sizeof(buf)) 717 abort(); 718 memcpy(buf, var, p - var - 1); 719 buf[p - var - 1] = '\0'; 720 strtodest(buf, flag, subtype, 721 varflags & VSQUOTE, dst); 722 } else 723 varvalue(var, varflags & VSQUOTE, subtype, flag, 724 dst); 725 if (subtype == VSLENGTH) { 726 varlenb = expdest - stackblock() - startloc; 727 varlen = varlenb; 728 if (localeisutf8) { 729 val = stackblock() + startloc; 730 for (;val != expdest; val++) 731 if ((*val & 0xC0) == 0x80) 732 varlen--; 733 } 734 STADJUST(-varlenb, expdest); 735 } 736 } else { 737 if (subtype == VSLENGTH) { 738 for (;*val; val++) 739 if (!localeisutf8 || 740 (*val & 0xC0) != 0x80) 741 varlen++; 742 } 743 else 744 strtodest(val, flag, subtype, 745 varflags & VSQUOTE, dst); 746 } 747 } 748 749 if (subtype == VSPLUS) 750 set = ! set; 751 752 switch (subtype) { 753 case VSLENGTH: 754 cvtnum(varlen, buf); 755 strtodest(buf, flag, VSNORMAL, varflags & VSQUOTE, dst); 756 break; 757 758 case VSNORMAL: 759 return p; 760 761 case VSPLUS: 762 case VSMINUS: 763 if (!set) { 764 return argstr(p, argbackq, 765 flag | (flag & EXP_SPLIT ? EXP_SPLIT_LIT : 0) | 766 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0), dst); 767 } 768 break; 769 770 case VSTRIMLEFT: 771 case VSTRIMLEFTMAX: 772 case VSTRIMRIGHT: 773 case VSTRIMRIGHTMAX: 774 if (!set) 775 break; 776 /* 777 * Terminate the string and start recording the pattern 778 * right after it 779 */ 780 STPUTC('\0', expdest); 781 patloc = expdest - stackblock(); 782 p = subevalvar_trim(p, argbackq, patloc, subtype, startloc); 783 reprocess(startloc, flag, VSNORMAL, varflags & VSQUOTE, dst); 784 if (flag & EXP_SPLIT && *var == '@' && varflags & VSQUOTE) 785 dst->state = WORD_QUOTEMARK; 786 return p; 787 788 case VSASSIGN: 789 case VSQUESTION: 790 if (!set) { 791 p = subevalvar_misc(p, argbackq, var, subtype, 792 startloc, varflags); 793 /* assert(subtype == VSASSIGN); */ 794 val = lookupvar(var); 795 strtodest(val, flag, subtype, varflags & VSQUOTE, dst); 796 return p; 797 } 798 break; 799 800 case VSERROR: 801 c = p - var - 1; 802 error("${%.*s%s}: Bad substitution", c, var, 803 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 804 805 default: 806 abort(); 807 } 808 809 { /* skip to end of alternative */ 810 int nesting = 1; 811 for (;;) { 812 if ((c = *p++) == CTLESC) 813 p++; 814 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) 815 *argbackq = (*argbackq)->next; 816 else if (c == CTLVAR) { 817 if ((*p++ & VSTYPE) != VSNORMAL) 818 nesting++; 819 } else if (c == CTLENDVAR) { 820 if (--nesting == 0) 821 break; 822 } 823 } 824 } 825 return p; 826 } 827 828 829 830 /* 831 * Test whether a special or positional parameter is set. 832 */ 833 834 static int 835 varisset(const char *name, int nulok) 836 { 837 838 if (*name == '!') 839 return backgndpidset(); 840 else if (*name == '@' || *name == '*') { 841 if (*shellparam.p == NULL) 842 return 0; 843 844 if (nulok) { 845 char **av; 846 847 for (av = shellparam.p; *av; av++) 848 if (**av != '\0') 849 return 1; 850 return 0; 851 } 852 } else if (is_digit(*name)) { 853 char *ap; 854 long num; 855 856 errno = 0; 857 num = strtol(name, NULL, 10); 858 if (errno != 0 || num > shellparam.nparam) 859 return 0; 860 861 if (num == 0) 862 ap = arg0; 863 else 864 ap = shellparam.p[num - 1]; 865 866 if (nulok && (ap == NULL || *ap == '\0')) 867 return 0; 868 } 869 return 1; 870 } 871 872 static void 873 strtodest(const char *p, int flag, int subtype, int quoted, 874 struct worddest *dst) 875 { 876 if (subtype == VSLENGTH || subtype == VSTRIMLEFT || 877 subtype == VSTRIMLEFTMAX || subtype == VSTRIMRIGHT || 878 subtype == VSTRIMRIGHTMAX) 879 STPUTS(p, expdest); 880 else if (flag & EXP_SPLIT && !quoted && dst != NULL) 881 STPUTS_SPLIT(p, BASESYNTAX, flag, expdest, dst); 882 else if (flag & (EXP_GLOB | EXP_CASE)) 883 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 884 else 885 STPUTS(p, expdest); 886 } 887 888 static void 889 reprocess(int startloc, int flag, int subtype, int quoted, 890 struct worddest *dst) 891 { 892 static char *buf = NULL; 893 static size_t buflen = 0; 894 char *startp; 895 size_t len, zpos, zlen; 896 897 startp = stackblock() + startloc; 898 len = expdest - startp; 899 if (len >= SIZE_MAX / 2) 900 abort(); 901 INTOFF; 902 if (len >= buflen) { 903 ckfree(buf); 904 buf = NULL; 905 } 906 if (buflen < 128) 907 buflen = 128; 908 while (len >= buflen) 909 buflen <<= 1; 910 if (buf == NULL) 911 buf = ckmalloc(buflen); 912 INTON; 913 memcpy(buf, startp, len); 914 buf[len] = '\0'; 915 STADJUST(-len, expdest); 916 for (zpos = 0;;) { 917 zlen = strlen(buf + zpos); 918 strtodest(buf + zpos, flag, subtype, quoted, dst); 919 zpos += zlen + 1; 920 if (zpos == len + 1) 921 break; 922 if (flag & EXP_SPLIT && (quoted || (zlen > 0 && zpos < len))) 923 NEXTWORD('\0', flag, expdest, dst); 924 } 925 } 926 927 /* 928 * Add the value of a special or positional parameter to the stack string. 929 */ 930 931 static void 932 varvalue(const char *name, int quoted, int subtype, int flag, 933 struct worddest *dst) 934 { 935 int num; 936 char *p; 937 int i; 938 int splitlater; 939 char sep[2]; 940 char **ap; 941 char buf[(NSHORTOPTS > 10 ? NSHORTOPTS : 10) + 1]; 942 943 if (subtype == VSLENGTH) 944 flag &= ~EXP_FULL; 945 splitlater = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 946 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX; 947 948 switch (*name) { 949 case '$': 950 num = rootpid; 951 break; 952 case '?': 953 num = oexitstatus; 954 break; 955 case '#': 956 num = shellparam.nparam; 957 break; 958 case '!': 959 num = backgndpidval(); 960 break; 961 case '-': 962 p = buf; 963 for (i = 0 ; i < NSHORTOPTS ; i++) { 964 if (optval[i]) 965 *p++ = optletter[i]; 966 } 967 *p = '\0'; 968 strtodest(buf, flag, subtype, quoted, dst); 969 return; 970 case '@': 971 if (flag & EXP_SPLIT && quoted) { 972 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 973 strtodest(p, flag, subtype, quoted, dst); 974 if (*ap) { 975 if (splitlater) 976 STPUTC('\0', expdest); 977 else 978 NEXTWORD('\0', flag, expdest, 979 dst); 980 } 981 } 982 if (shellparam.nparam > 0) 983 dst->state = WORD_QUOTEMARK; 984 return; 985 } 986 /* FALLTHROUGH */ 987 case '*': 988 if (ifsset()) 989 sep[0] = ifsval()[0]; 990 else 991 sep[0] = ' '; 992 sep[1] = '\0'; 993 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 994 strtodest(p, flag, subtype, quoted, dst); 995 if (!*ap) 996 break; 997 if (sep[0]) 998 strtodest(sep, flag, subtype, quoted, dst); 999 else if (flag & EXP_SPLIT && !quoted && **ap != '\0') { 1000 if (splitlater) 1001 STPUTC('\0', expdest); 1002 else 1003 NEXTWORD('\0', flag, expdest, dst); 1004 } 1005 } 1006 return; 1007 default: 1008 if (is_digit(*name)) { 1009 num = atoi(name); 1010 if (num == 0) 1011 p = arg0; 1012 else if (num > 0 && num <= shellparam.nparam) 1013 p = shellparam.p[num - 1]; 1014 else 1015 return; 1016 strtodest(p, flag, subtype, quoted, dst); 1017 } 1018 return; 1019 } 1020 cvtnum(num, buf); 1021 strtodest(buf, flag, subtype, quoted, dst); 1022 } 1023 1024 1025 1026 static char expdir[PATH_MAX]; 1027 #define expdir_end (expdir + sizeof(expdir)) 1028 1029 /* 1030 * Perform pathname generation and remove control characters. 1031 * At this point, the only control characters should be CTLESC. 1032 * The results are stored in the list dstlist. 1033 */ 1034 static void 1035 expandmeta(char *pattern, struct arglist *dstlist) 1036 { 1037 char *p; 1038 int firstmatch; 1039 char c; 1040 1041 firstmatch = dstlist->count; 1042 p = pattern; 1043 for (; (c = *p) != '\0'; p++) { 1044 /* fast check for meta chars */ 1045 if (c == '*' || c == '?' || c == '[') { 1046 INTOFF; 1047 expmeta(expdir, pattern, dstlist); 1048 INTON; 1049 break; 1050 } 1051 } 1052 if (dstlist->count == firstmatch) { 1053 /* 1054 * no matches 1055 */ 1056 rmescapes(pattern); 1057 appendarglist(dstlist, pattern); 1058 } else { 1059 qsort(&dstlist->args[firstmatch], 1060 dstlist->count - firstmatch, 1061 sizeof(dstlist->args[0]), expsortcmp); 1062 } 1063 } 1064 1065 1066 /* 1067 * Do metacharacter (i.e. *, ?, [...]) expansion. 1068 */ 1069 1070 static void 1071 expmeta(char *enddir, char *name, struct arglist *arglist) 1072 { 1073 const char *p; 1074 const char *q; 1075 const char *start; 1076 char *endname; 1077 int metaflag; 1078 struct stat statb; 1079 DIR *dirp; 1080 struct dirent *dp; 1081 int atend; 1082 int matchdot; 1083 int esc; 1084 int namlen; 1085 1086 metaflag = 0; 1087 start = name; 1088 for (p = name; esc = 0, *p; p += esc + 1) { 1089 if (*p == '*' || *p == '?') 1090 metaflag = 1; 1091 else if (*p == '[') { 1092 q = p + 1; 1093 if (*q == '!' || *q == '^') 1094 q++; 1095 for (;;) { 1096 if (*q == CTLESC) 1097 q++; 1098 if (*q == '/' || *q == '\0') 1099 break; 1100 if (*++q == ']') { 1101 metaflag = 1; 1102 break; 1103 } 1104 } 1105 } else if (*p == '\0') 1106 break; 1107 else { 1108 if (*p == CTLESC) 1109 esc++; 1110 if (p[esc] == '/') { 1111 if (metaflag) 1112 break; 1113 start = p + esc + 1; 1114 } 1115 } 1116 } 1117 if (metaflag == 0) { /* we've reached the end of the file name */ 1118 if (enddir != expdir) 1119 metaflag++; 1120 for (p = name ; ; p++) { 1121 if (*p == CTLESC) 1122 p++; 1123 *enddir++ = *p; 1124 if (*p == '\0') 1125 break; 1126 if (enddir == expdir_end) 1127 return; 1128 } 1129 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1130 appendarglist(arglist, stsavestr(expdir)); 1131 return; 1132 } 1133 endname = name + (p - name); 1134 if (start != name) { 1135 p = name; 1136 while (p < start) { 1137 if (*p == CTLESC) 1138 p++; 1139 *enddir++ = *p++; 1140 if (enddir == expdir_end) 1141 return; 1142 } 1143 } 1144 if (enddir == expdir) { 1145 p = "."; 1146 } else if (enddir == expdir + 1 && *expdir == '/') { 1147 p = "/"; 1148 } else { 1149 p = expdir; 1150 enddir[-1] = '\0'; 1151 } 1152 if ((dirp = opendir(p)) == NULL) 1153 return; 1154 if (enddir != expdir) 1155 enddir[-1] = '/'; 1156 if (*endname == 0) { 1157 atend = 1; 1158 } else { 1159 atend = 0; 1160 *endname = '\0'; 1161 endname += esc + 1; 1162 } 1163 matchdot = 0; 1164 p = start; 1165 if (*p == CTLESC) 1166 p++; 1167 if (*p == '.') 1168 matchdot++; 1169 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1170 if (dp->d_name[0] == '.' && ! matchdot) 1171 continue; 1172 if (patmatch(start, dp->d_name)) { 1173 namlen = dp->d_namlen; 1174 if (enddir + namlen + 1 > expdir_end) 1175 continue; 1176 memcpy(enddir, dp->d_name, namlen + 1); 1177 if (atend) 1178 appendarglist(arglist, stsavestr(expdir)); 1179 else { 1180 if (dp->d_type != DT_UNKNOWN && 1181 dp->d_type != DT_DIR && 1182 dp->d_type != DT_LNK) 1183 continue; 1184 if (enddir + namlen + 2 > expdir_end) 1185 continue; 1186 enddir[namlen] = '/'; 1187 enddir[namlen + 1] = '\0'; 1188 expmeta(enddir + namlen + 1, endname, arglist); 1189 } 1190 } 1191 } 1192 closedir(dirp); 1193 if (! atend) 1194 endname[-esc - 1] = esc ? CTLESC : '/'; 1195 } 1196 1197 1198 static int 1199 expsortcmp(const void *p1, const void *p2) 1200 { 1201 const char *s1 = *(const char * const *)p1; 1202 const char *s2 = *(const char * const *)p2; 1203 1204 return (strcoll(s1, s2)); 1205 } 1206 1207 1208 1209 static wchar_t 1210 get_wc(const char **p) 1211 { 1212 wchar_t c; 1213 int chrlen; 1214 1215 chrlen = mbtowc(&c, *p, 4); 1216 if (chrlen == 0) 1217 return 0; 1218 else if (chrlen == -1) 1219 c = 0; 1220 else 1221 *p += chrlen; 1222 return c; 1223 } 1224 1225 1226 /* 1227 * See if a character matches a character class, starting at the first colon 1228 * of "[:class:]". 1229 * If a valid character class is recognized, a pointer to the next character 1230 * after the final closing bracket is stored into *end, otherwise a null 1231 * pointer is stored into *end. 1232 */ 1233 static int 1234 match_charclass(const char *p, wchar_t chr, const char **end) 1235 { 1236 char name[20]; 1237 const char *nameend; 1238 wctype_t cclass; 1239 1240 *end = NULL; 1241 p++; 1242 nameend = strstr(p, ":]"); 1243 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || 1244 nameend == p) 1245 return 0; 1246 memcpy(name, p, nameend - p); 1247 name[nameend - p] = '\0'; 1248 *end = nameend + 2; 1249 cclass = wctype(name); 1250 /* An unknown class matches nothing but is valid nevertheless. */ 1251 if (cclass == 0) 1252 return 0; 1253 return iswctype(chr, cclass); 1254 } 1255 1256 1257 /* 1258 * Returns true if the pattern matches the string. 1259 */ 1260 1261 static int 1262 patmatch(const char *pattern, const char *string) 1263 { 1264 const char *p, *q, *end; 1265 const char *bt_p, *bt_q; 1266 char c; 1267 wchar_t wc, wc2; 1268 1269 p = pattern; 1270 q = string; 1271 bt_p = NULL; 1272 bt_q = NULL; 1273 for (;;) { 1274 switch (c = *p++) { 1275 case '\0': 1276 if (*q != '\0') 1277 goto backtrack; 1278 return 1; 1279 case CTLESC: 1280 if (*q++ != *p++) 1281 goto backtrack; 1282 break; 1283 case '?': 1284 if (*q == '\0') 1285 return 0; 1286 if (localeisutf8) { 1287 wc = get_wc(&q); 1288 /* 1289 * A '?' does not match invalid UTF-8 but a 1290 * '*' does, so backtrack. 1291 */ 1292 if (wc == 0) 1293 goto backtrack; 1294 } else 1295 q++; 1296 break; 1297 case '*': 1298 c = *p; 1299 while (c == '*') 1300 c = *++p; 1301 /* 1302 * If the pattern ends here, we know the string 1303 * matches without needing to look at the rest of it. 1304 */ 1305 if (c == '\0') 1306 return 1; 1307 /* 1308 * First try the shortest match for the '*' that 1309 * could work. We can forget any earlier '*' since 1310 * there is no way having it match more characters 1311 * can help us, given that we are already here. 1312 */ 1313 bt_p = p; 1314 bt_q = q; 1315 break; 1316 case '[': { 1317 const char *savep, *saveq; 1318 int invert, found; 1319 wchar_t chr; 1320 1321 savep = p, saveq = q; 1322 invert = 0; 1323 if (*p == '!' || *p == '^') { 1324 invert++; 1325 p++; 1326 } 1327 found = 0; 1328 if (*q == '\0') 1329 return 0; 1330 if (localeisutf8) { 1331 chr = get_wc(&q); 1332 if (chr == 0) 1333 goto backtrack; 1334 } else 1335 chr = (unsigned char)*q++; 1336 c = *p++; 1337 do { 1338 if (c == '\0') { 1339 p = savep, q = saveq; 1340 c = '['; 1341 goto dft; 1342 } 1343 if (c == '[' && *p == ':') { 1344 found |= match_charclass(p, chr, &end); 1345 if (end != NULL) 1346 p = end; 1347 } 1348 if (c == CTLESC) 1349 c = *p++; 1350 if (localeisutf8 && c & 0x80) { 1351 p--; 1352 wc = get_wc(&p); 1353 if (wc == 0) /* bad utf-8 */ 1354 return 0; 1355 } else 1356 wc = (unsigned char)c; 1357 if (*p == '-' && p[1] != ']') { 1358 p++; 1359 if (*p == CTLESC) 1360 p++; 1361 if (localeisutf8) { 1362 wc2 = get_wc(&p); 1363 if (wc2 == 0) /* bad utf-8 */ 1364 return 0; 1365 } else 1366 wc2 = (unsigned char)*p++; 1367 if ( collate_range_cmp(chr, wc) >= 0 1368 && collate_range_cmp(chr, wc2) <= 0 1369 ) 1370 found = 1; 1371 } else { 1372 if (chr == wc) 1373 found = 1; 1374 } 1375 } while ((c = *p++) != ']'); 1376 if (found == invert) 1377 goto backtrack; 1378 break; 1379 } 1380 dft: default: 1381 if (*q == '\0') 1382 return 0; 1383 if (*q++ == c) 1384 break; 1385 backtrack: 1386 /* 1387 * If we have a mismatch (other than hitting the end 1388 * of the string), go back to the last '*' seen and 1389 * have it match one additional character. 1390 */ 1391 if (bt_p == NULL) 1392 return 0; 1393 if (*bt_q == '\0') 1394 return 0; 1395 bt_q++; 1396 p = bt_p; 1397 q = bt_q; 1398 break; 1399 } 1400 } 1401 } 1402 1403 1404 1405 /* 1406 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1407 */ 1408 1409 void 1410 rmescapes(char *str) 1411 { 1412 char *p, *q; 1413 1414 p = str; 1415 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1416 if (*p++ == '\0') 1417 return; 1418 } 1419 q = p; 1420 while (*p) { 1421 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1422 p++; 1423 continue; 1424 } 1425 if (*p == CTLESC) 1426 p++; 1427 *q++ = *p++; 1428 } 1429 *q = '\0'; 1430 } 1431 1432 1433 1434 /* 1435 * See if a pattern matches in a case statement. 1436 */ 1437 1438 int 1439 casematch(union node *pattern, const char *val) 1440 { 1441 struct stackmark smark; 1442 struct nodelist *argbackq; 1443 int result; 1444 char *p; 1445 1446 setstackmark(&smark); 1447 argbackq = pattern->narg.backquote; 1448 STARTSTACKSTR(expdest); 1449 argstr(pattern->narg.text, &argbackq, EXP_TILDE | EXP_CASE, NULL); 1450 STPUTC('\0', expdest); 1451 p = grabstackstr(expdest); 1452 result = patmatch(p, val); 1453 popstackmark(&smark); 1454 return result; 1455 } 1456 1457 /* 1458 * Our own itoa(). 1459 */ 1460 1461 static void 1462 cvtnum(int num, char *buf) 1463 { 1464 char temp[32]; 1465 int neg = num < 0; 1466 char *p = temp + 31; 1467 1468 temp[31] = '\0'; 1469 1470 do { 1471 *--p = num % 10 + '0'; 1472 } while ((num /= 10) != 0); 1473 1474 if (neg) 1475 *--p = '-'; 1476 1477 memcpy(buf, p, temp + 32 - p); 1478 } 1479 1480 /* 1481 * Do most of the work for wordexp(3). 1482 */ 1483 1484 int 1485 wordexpcmd(int argc, char **argv) 1486 { 1487 size_t len; 1488 int i; 1489 1490 out1fmt("%08x", argc - 1); 1491 for (i = 1, len = 0; i < argc; i++) 1492 len += strlen(argv[i]); 1493 out1fmt("%08x", (int)len); 1494 for (i = 1; i < argc; i++) 1495 outbin(argv[i], strlen(argv[i]) + 1, out1); 1496 return (0); 1497 } 1498 1499 /* 1500 * Do most of the work for wordexp(3), new version. 1501 */ 1502 1503 int 1504 freebsd_wordexpcmd(int argc __unused, char **argv __unused) 1505 { 1506 struct arglist arglist; 1507 union node *args, *n; 1508 size_t len; 1509 int ch; 1510 int protected = 0; 1511 int fd = -1; 1512 int i; 1513 1514 while ((ch = nextopt("f:p")) != '\0') { 1515 switch (ch) { 1516 case 'f': 1517 fd = number(shoptarg); 1518 break; 1519 case 'p': 1520 protected = 1; 1521 break; 1522 } 1523 } 1524 if (*argptr != NULL) 1525 error("wrong number of arguments"); 1526 if (fd < 0) 1527 error("missing fd"); 1528 INTOFF; 1529 setinputfd(fd, 1); 1530 INTON; 1531 args = parsewordexp(); 1532 popfile(); /* will also close fd */ 1533 if (protected) 1534 for (n = args; n != NULL; n = n->narg.next) { 1535 if (n->narg.backquote != NULL) { 1536 outcslow('C', out1); 1537 error("command substitution disabled"); 1538 } 1539 } 1540 outcslow(' ', out1); 1541 emptyarglist(&arglist); 1542 for (n = args; n != NULL; n = n->narg.next) 1543 expandarg(n, &arglist, EXP_FULL | EXP_TILDE); 1544 for (i = 0, len = 0; i < arglist.count; i++) 1545 len += strlen(arglist.args[i]); 1546 out1fmt("%016x %016zx", arglist.count, len); 1547 for (i = 0; i < arglist.count; i++) 1548 outbin(arglist.args[i], strlen(arglist.args[i]) + 1, out1); 1549 return (0); 1550 } 1551