expand.c revision 231790
111820Sjulian/*- 211820Sjulian * Copyright (c) 1991, 1993 311820Sjulian * The Regents of the University of California. All rights reserved. 411820Sjulian * Copyright (c) 1997-2005 511820Sjulian * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. 611820Sjulian * 711820Sjulian * This code is derived from software contributed to Berkeley by 811820Sjulian * Kenneth Almquist. 911820Sjulian * 1011820Sjulian * Redistribution and use in source and binary forms, with or without 1111820Sjulian * modification, are permitted provided that the following conditions 1211820Sjulian * are met: 1311820Sjulian * 1. Redistributions of source code must retain the above copyright 1411820Sjulian * notice, this list of conditions and the following disclaimer. 1511820Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1611820Sjulian * notice, this list of conditions and the following disclaimer in the 1711820Sjulian * documentation and/or other materials provided with the distribution. 1811820Sjulian * 4. Neither the name of the University nor the names of its contributors 1911820Sjulian * may be used to endorse or promote products derived from this software 2011820Sjulian * without specific prior written permission. 2111820Sjulian * 2211820Sjulian * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2311820Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2411820Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2511820Sjulian * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2611820Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2711820Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2811820Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2911820Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3011820Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3111820Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3211820Sjulian * SUCH DAMAGE. 3311820Sjulian */ 3411820Sjulian 3511820Sjulian#ifndef lint 3611820Sjulian#if 0 3711820Sjulianstatic char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 3850479Speter#endif 3911820Sjulian#endif /* not lint */ 4011820Sjulian#include <sys/cdefs.h> 4111820Sjulian__FBSDID("$FreeBSD: stable/9/bin/sh/expand.c 231790 2012-02-15 22:45:57Z jilles $"); 42122760Strhodes 4311820Sjulian#include <sys/types.h> 4411820Sjulian#include <sys/time.h> 4511820Sjulian#include <sys/stat.h> 4611820Sjulian#include <dirent.h> 4711820Sjulian#include <errno.h> 4811820Sjulian#include <inttypes.h> 4911820Sjulian#include <limits.h> 5011820Sjulian#include <pwd.h> 5111820Sjulian#include <stdio.h> 5211820Sjulian#include <stdlib.h> 5311820Sjulian#include <string.h> 5411820Sjulian#include <unistd.h> 5511820Sjulian#include <wchar.h> 5611820Sjulian#include <wctype.h> 5711820Sjulian 5811820Sjulian/* 5911820Sjulian * Routines to expand arguments to commands. We have to deal with 6011820Sjulian * backquotes, shell variables, and file metacharacters. 6111820Sjulian */ 6211820Sjulian 6311820Sjulian#include "shell.h" 6411820Sjulian#include "main.h" 6511820Sjulian#include "nodes.h" 6611820Sjulian#include "eval.h" 6711820Sjulian#include "expand.h" 6811820Sjulian#include "syntax.h" 6911820Sjulian#include "parser.h" 7011820Sjulian#include "jobs.h" 7111820Sjulian#include "options.h" 7211820Sjulian#include "var.h" 7311820Sjulian#include "input.h" 7411820Sjulian#include "output.h" 7511820Sjulian#include "memalloc.h" 7611820Sjulian#include "error.h" 7711820Sjulian#include "mystring.h" 7811820Sjulian#include "arith.h" 7911820Sjulian#include "show.h" 8011820Sjulian#include "builtins.h" 8111820Sjulian 8211820Sjulian/* 8311820Sjulian * Structure specifying which parts of the string should be searched 8411820Sjulian * for IFS characters. 8511820Sjulian */ 8611820Sjulian 8711820Sjulianstruct ifsregion { 8811820Sjulian struct ifsregion *next; /* next region in list */ 8911820Sjulian int begoff; /* offset of start of region */ 9011820Sjulian int endoff; /* offset of end of region */ 9111820Sjulian int inquotes; /* search for nul bytes only */ 9211820Sjulian}; 9311820Sjulian 9411820Sjulian 9511820Sjulianstatic char *expdest; /* output of current string */ 9627244Sjhaystatic struct nodelist *argbackq; /* list of back quote expressions */ 9727244Sjhaystatic struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 9827244Sjhaystatic struct ifsregion *ifslastp; /* last struct in list */ 9927244Sjhaystatic struct arglist exparg; /* holds expanded arg list */ 10027244Sjhay 10111820Sjulianstatic void argstr(char *, int); 10227244Sjhaystatic char *exptilde(char *, int); 10327244Sjhaystatic void expbackq(union node *, int, int); 10427244Sjhaystatic int subevalvar(char *, char *, int, int, int, int, int); 10527244Sjhaystatic char *evalvar(char *, int); 10627244Sjhaystatic int varisset(char *, int); 10727244Sjhaystatic void varvalue(char *, int, int, int); 10827244Sjhaystatic void recordregion(int, int, int); 10927244Sjhaystatic void removerecordregions(int); 11027244Sjhaystatic void ifsbreakup(char *, struct arglist *); 11127244Sjhaystatic void expandmeta(struct strlist *, int); 11227244Sjhaystatic void expmeta(char *, char *); 11327244Sjhaystatic void addfname(char *); 11427244Sjhaystatic struct strlist *expsort(struct strlist *); 11527244Sjhaystatic struct strlist *msort(struct strlist *, int); 11627244Sjhaystatic int patmatch(const char *, const char *, int); 11727244Sjhaystatic char *cvtnum(int, char *); 11827244Sjhaystatic int collate_range_cmp(wchar_t, wchar_t); 11911820Sjulian 12011820Sjulianstatic int 12127244Sjhaycollate_range_cmp(wchar_t c1, wchar_t c2) 12211820Sjulian{ 12311820Sjulian static wchar_t s1[2], s2[2]; 12411820Sjulian 12511820Sjulian s1[0] = c1; 12611820Sjulian s2[0] = c2; 12711820Sjulian return (wcscoll(s1, s2)); 12811820Sjulian} 12911820Sjulian 13011820Sjulian/* 13111820Sjulian * Expand shell variables and backquotes inside a here document. 13211820Sjulian * union node *arg the document 13311820Sjulian * int fd; where to write the expanded version 13411820Sjulian */ 13511820Sjulian 13611820Sjulianvoid 13711820Sjulianexpandhere(union node *arg, int fd) 13811820Sjulian{ 13911820Sjulian expandarg(arg, (struct arglist *)NULL, 0); 14011820Sjulian xwrite(fd, stackblock(), expdest - stackblock()); 14111820Sjulian} 14211820Sjulian 14311820Sjulianstatic char * 14411820Sjulianstputs_quotes(const char *data, const char *syntax, char *p) 14511820Sjulian{ 14611820Sjulian while (*data) { 14711820Sjulian CHECKSTRSPACE(2, p); 14811820Sjulian if (syntax[(int)*data] == CCTL) 14911820Sjulian USTPUTC(CTLESC, p); 15011820Sjulian USTPUTC(*data++, p); 15111820Sjulian } 15211820Sjulian return (p); 15311820Sjulian} 15411820Sjulian#define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) 15511820Sjulian 15611820Sjulian/* 15711820Sjulian * Perform expansions on an argument, placing the resulting list of arguments 15811820Sjulian * in arglist. Parameter expansion, command substitution and arithmetic 15911820Sjulian * expansion are always performed; additional expansions can be requested 16011820Sjulian * via flag (EXP_*). 16111820Sjulian * The result is left in the stack string. 16211820Sjulian * When arglist is NULL, perform here document expansion. 16311820Sjulian * 16411820Sjulian * Caution: this function uses global state and is not reentrant. 16511820Sjulian * However, a new invocation after an interrupted invocation is safe 16611820Sjulian * and will reset the global state for the new call. 16711820Sjulian */ 16811820Sjulianvoid 16911820Sjulianexpandarg(union node *arg, struct arglist *arglist, int flag) 17011820Sjulian{ 17111820Sjulian struct strlist *sp; 17211820Sjulian char *p; 17311820Sjulian 17411820Sjulian argbackq = arg->narg.backquote; 17511820Sjulian STARTSTACKSTR(expdest); 17611820Sjulian ifsfirst.next = NULL; 17711820Sjulian ifslastp = NULL; 17811820Sjulian argstr(arg->narg.text, flag); 17911820Sjulian if (arglist == NULL) { 18011820Sjulian STACKSTRNUL(expdest); 18111820Sjulian return; /* here document expanded */ 18211820Sjulian } 18311820Sjulian STPUTC('\0', expdest); 18411820Sjulian p = grabstackstr(expdest); 18511820Sjulian exparg.lastp = &exparg.list; 18611820Sjulian /* 18711820Sjulian * TODO - EXP_REDIR 18811820Sjulian */ 18911820Sjulian if (flag & EXP_FULL) { 19011820Sjulian ifsbreakup(p, &exparg); 19111820Sjulian *exparg.lastp = NULL; 19211820Sjulian exparg.lastp = &exparg.list; 19311820Sjulian expandmeta(exparg.list, flag); 19411820Sjulian } else { 19511820Sjulian if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 19611820Sjulian rmescapes(p); 19711820Sjulian sp = (struct strlist *)stalloc(sizeof (struct strlist)); 19811820Sjulian sp->text = p; 19911820Sjulian *exparg.lastp = sp; 20011820Sjulian exparg.lastp = &sp->next; 20111820Sjulian } 20211820Sjulian while (ifsfirst.next != NULL) { 20311820Sjulian struct ifsregion *ifsp; 20411820Sjulian INTOFF; 20511820Sjulian ifsp = ifsfirst.next->next; 20611820Sjulian ckfree(ifsfirst.next); 20711820Sjulian ifsfirst.next = ifsp; 20811820Sjulian INTON; 20911820Sjulian } 21011820Sjulian *exparg.lastp = NULL; 21111820Sjulian if (exparg.list) { 21211820Sjulian *arglist->lastp = exparg.list; 21311820Sjulian arglist->lastp = exparg.lastp; 21411820Sjulian } 21512620Sjulian} 21612620Sjulian 21711820Sjulian 21811820Sjulian 21912620Sjulian/* 22012620Sjulian * Perform parameter expansion, command substitution and arithmetic 22111820Sjulian * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 22211820Sjulian * Processing ends at a CTLENDVAR character as well as '\0'. 22311820Sjulian * This is used to expand word in ${var+word} etc. 22411820Sjulian * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC 22511820Sjulian * characters to allow for further processing. 22611820Sjulian * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 22711820Sjulian */ 22811820Sjulianstatic void 22911820Sjulianargstr(char *p, int flag) 23011820Sjulian{ 23111820Sjulian char c; 23211820Sjulian int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 23311820Sjulian int firsteq = 1; 23411820Sjulian int split_lit; 23511820Sjulian int lit_quoted; 23611820Sjulian 23711820Sjulian split_lit = flag & EXP_SPLIT_LIT; 23811820Sjulian lit_quoted = flag & EXP_LIT_QUOTED; 23911820Sjulian flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 24011820Sjulian if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 24111820Sjulian p = exptilde(p, flag); 24211820Sjulian for (;;) { 24311820Sjulian CHECKSTRSPACE(2, expdest); 24411820Sjulian switch (c = *p++) { 24511820Sjulian case '\0': 24611820Sjulian case CTLENDVAR: 24711820Sjulian goto breakloop; 24811820Sjulian case CTLQUOTEMARK: 24911820Sjulian lit_quoted = 1; 25011820Sjulian /* "$@" syntax adherence hack */ 25111820Sjulian if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 25211820Sjulian break; 25311820Sjulian if ((flag & EXP_FULL) != 0) 25411820Sjulian USTPUTC(c, expdest); 25511820Sjulian break; 25611820Sjulian case CTLQUOTEEND: 25711820Sjulian lit_quoted = 0; 25811820Sjulian break; 25911820Sjulian case CTLESC: 26011820Sjulian if (quotes) 26111820Sjulian USTPUTC(c, expdest); 26211820Sjulian c = *p++; 26311820Sjulian USTPUTC(c, expdest); 26411820Sjulian if (split_lit && !lit_quoted) 26511820Sjulian recordregion(expdest - stackblock() - 26611820Sjulian (quotes ? 2 : 1), 26711820Sjulian expdest - stackblock(), 0); 26811820Sjulian break; 26911820Sjulian case CTLVAR: 27011820Sjulian p = evalvar(p, flag); 27111820Sjulian break; 27211820Sjulian case CTLBACKQ: 27311820Sjulian case CTLBACKQ|CTLQUOTE: 27411820Sjulian expbackq(argbackq->n, c & CTLQUOTE, flag); 27511820Sjulian argbackq = argbackq->next; 27611820Sjulian break; 27711820Sjulian case CTLENDARI: 27811820Sjulian expari(flag); 27911820Sjulian break; 28011820Sjulian case ':': 28111820Sjulian case '=': 28211820Sjulian /* 28311820Sjulian * sort of a hack - expand tildes in variable 28411820Sjulian * assignments (after the first '=' and after ':'s). 28511820Sjulian */ 28611820Sjulian USTPUTC(c, expdest); 28711820Sjulian if (split_lit && !lit_quoted) 28811820Sjulian recordregion(expdest - stackblock() - 1, 28911820Sjulian expdest - stackblock(), 0); 29011820Sjulian if (flag & EXP_VARTILDE && *p == '~' && 29111820Sjulian (c != '=' || firsteq)) { 29211820Sjulian if (c == '=') 29311820Sjulian firsteq = 0; 29411820Sjulian p = exptilde(p, flag); 29511820Sjulian } 29611820Sjulian break; 29711820Sjulian default: 29811820Sjulian USTPUTC(c, expdest); 299 if (split_lit && !lit_quoted) 300 recordregion(expdest - stackblock() - 1, 301 expdest - stackblock(), 0); 302 } 303 } 304breakloop:; 305} 306 307/* 308 * Perform tilde expansion, placing the result in the stack string and 309 * returning the next position in the input string to process. 310 */ 311static char * 312exptilde(char *p, int flag) 313{ 314 char c, *startp = p; 315 struct passwd *pw; 316 char *home; 317 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 318 319 while ((c = *p) != '\0') { 320 switch(c) { 321 case CTLESC: /* This means CTL* are always considered quoted. */ 322 case CTLVAR: 323 case CTLBACKQ: 324 case CTLBACKQ | CTLQUOTE: 325 case CTLARI: 326 case CTLENDARI: 327 case CTLQUOTEMARK: 328 return (startp); 329 case ':': 330 if (flag & EXP_VARTILDE) 331 goto done; 332 break; 333 case '/': 334 case CTLENDVAR: 335 goto done; 336 } 337 p++; 338 } 339done: 340 *p = '\0'; 341 if (*(startp+1) == '\0') { 342 if ((home = lookupvar("HOME")) == NULL) 343 goto lose; 344 } else { 345 if ((pw = getpwnam(startp+1)) == NULL) 346 goto lose; 347 home = pw->pw_dir; 348 } 349 if (*home == '\0') 350 goto lose; 351 *p = c; 352 if (quotes) 353 STPUTS_QUOTES(home, SQSYNTAX, expdest); 354 else 355 STPUTS(home, expdest); 356 return (p); 357lose: 358 *p = c; 359 return (startp); 360} 361 362 363static void 364removerecordregions(int endoff) 365{ 366 if (ifslastp == NULL) 367 return; 368 369 if (ifsfirst.endoff > endoff) { 370 while (ifsfirst.next != NULL) { 371 struct ifsregion *ifsp; 372 INTOFF; 373 ifsp = ifsfirst.next->next; 374 ckfree(ifsfirst.next); 375 ifsfirst.next = ifsp; 376 INTON; 377 } 378 if (ifsfirst.begoff > endoff) 379 ifslastp = NULL; 380 else { 381 ifslastp = &ifsfirst; 382 ifsfirst.endoff = endoff; 383 } 384 return; 385 } 386 387 ifslastp = &ifsfirst; 388 while (ifslastp->next && ifslastp->next->begoff < endoff) 389 ifslastp=ifslastp->next; 390 while (ifslastp->next != NULL) { 391 struct ifsregion *ifsp; 392 INTOFF; 393 ifsp = ifslastp->next->next; 394 ckfree(ifslastp->next); 395 ifslastp->next = ifsp; 396 INTON; 397 } 398 if (ifslastp->endoff > endoff) 399 ifslastp->endoff = endoff; 400} 401 402/* 403 * Expand arithmetic expression. Backup to start of expression, 404 * evaluate, place result in (backed up) result, adjust string position. 405 */ 406void 407expari(int flag) 408{ 409 char *p, *q, *start; 410 arith_t result; 411 int begoff; 412 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 413 int quoted; 414 415 /* 416 * This routine is slightly over-complicated for 417 * efficiency. First we make sure there is 418 * enough space for the result, which may be bigger 419 * than the expression. Next we 420 * scan backwards looking for the start of arithmetic. If the 421 * next previous character is a CTLESC character, then we 422 * have to rescan starting from the beginning since CTLESC 423 * characters have to be processed left to right. 424 */ 425 CHECKSTRSPACE(DIGITS(result) - 2, expdest); 426 USTPUTC('\0', expdest); 427 start = stackblock(); 428 p = expdest - 2; 429 while (p >= start && *p != CTLARI) 430 --p; 431 if (p < start || *p != CTLARI) 432 error("missing CTLARI (shouldn't happen)"); 433 if (p > start && *(p - 1) == CTLESC) 434 for (p = start; *p != CTLARI; p++) 435 if (*p == CTLESC) 436 p++; 437 438 if (p[1] == '"') 439 quoted=1; 440 else 441 quoted=0; 442 begoff = p - start; 443 removerecordregions(begoff); 444 if (quotes) 445 rmescapes(p+2); 446 q = grabstackstr(expdest); 447 result = arith(p+2); 448 ungrabstackstr(q, expdest); 449 fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 450 while (*p++) 451 ; 452 if (quoted == 0) 453 recordregion(begoff, p - 1 - start, 0); 454 result = expdest - p + 1; 455 STADJUST(-result, expdest); 456} 457 458 459/* 460 * Perform command substitution. 461 */ 462static void 463expbackq(union node *cmd, int quoted, int flag) 464{ 465 struct backcmd in; 466 int i; 467 char buf[128]; 468 char *p; 469 char *dest = expdest; 470 struct ifsregion saveifs, *savelastp; 471 struct nodelist *saveargbackq; 472 char lastc; 473 int startloc = dest - stackblock(); 474 char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 475 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 476 int nnl; 477 478 INTOFF; 479 saveifs = ifsfirst; 480 savelastp = ifslastp; 481 saveargbackq = argbackq; 482 p = grabstackstr(dest); 483 evalbackcmd(cmd, &in); 484 ungrabstackstr(p, dest); 485 ifsfirst = saveifs; 486 ifslastp = savelastp; 487 argbackq = saveargbackq; 488 489 p = in.buf; 490 lastc = '\0'; 491 nnl = 0; 492 /* Don't copy trailing newlines */ 493 for (;;) { 494 if (--in.nleft < 0) { 495 if (in.fd < 0) 496 break; 497 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 498 TRACE(("expbackq: read returns %d\n", i)); 499 if (i <= 0) 500 break; 501 p = buf; 502 in.nleft = i - 1; 503 } 504 lastc = *p++; 505 if (lastc != '\0') { 506 if (lastc == '\n') { 507 nnl++; 508 } else { 509 CHECKSTRSPACE(nnl + 2, dest); 510 while (nnl > 0) { 511 nnl--; 512 USTPUTC('\n', dest); 513 } 514 if (quotes && syntax[(int)lastc] == CCTL) 515 USTPUTC(CTLESC, dest); 516 USTPUTC(lastc, dest); 517 } 518 } 519 } 520 521 if (in.fd >= 0) 522 close(in.fd); 523 if (in.buf) 524 ckfree(in.buf); 525 if (in.jp) 526 exitstatus = waitforjob(in.jp, (int *)NULL); 527 if (quoted == 0) 528 recordregion(startloc, dest - stackblock(), 0); 529 TRACE(("expbackq: size=%td: \"%.*s\"\n", 530 ((dest - stackblock()) - startloc), 531 (int)((dest - stackblock()) - startloc), 532 stackblock() + startloc)); 533 expdest = dest; 534 INTON; 535} 536 537 538 539static int 540subevalvar(char *p, char *str, int strloc, int subtype, int startloc, 541 int varflags, int quotes) 542{ 543 char *startp; 544 char *loc = NULL; 545 char *q; 546 int c = 0; 547 struct nodelist *saveargbackq = argbackq; 548 int amount; 549 550 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 551 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 552 EXP_CASE : 0) | EXP_TILDE); 553 STACKSTRNUL(expdest); 554 argbackq = saveargbackq; 555 startp = stackblock() + startloc; 556 if (str == NULL) 557 str = stackblock() + strloc; 558 559 switch (subtype) { 560 case VSASSIGN: 561 setvar(str, startp, 0); 562 amount = startp - expdest; 563 STADJUST(amount, expdest); 564 varflags &= ~VSNUL; 565 return 1; 566 567 case VSQUESTION: 568 if (*p != CTLENDVAR) { 569 outfmt(out2, "%s\n", startp); 570 error((char *)NULL); 571 } 572 error("%.*s: parameter %snot set", (int)(p - str - 1), 573 str, (varflags & VSNUL) ? "null or " 574 : nullstr); 575 return 0; 576 577 case VSTRIMLEFT: 578 for (loc = startp; loc < str; loc++) { 579 c = *loc; 580 *loc = '\0'; 581 if (patmatch(str, startp, quotes)) { 582 *loc = c; 583 goto recordleft; 584 } 585 *loc = c; 586 if (quotes && *loc == CTLESC) 587 loc++; 588 } 589 return 0; 590 591 case VSTRIMLEFTMAX: 592 for (loc = str - 1; loc >= startp;) { 593 c = *loc; 594 *loc = '\0'; 595 if (patmatch(str, startp, quotes)) { 596 *loc = c; 597 goto recordleft; 598 } 599 *loc = c; 600 loc--; 601 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 602 for (q = startp; q < loc; q++) 603 if (*q == CTLESC) 604 q++; 605 if (q > loc) 606 loc--; 607 } 608 } 609 return 0; 610 611 case VSTRIMRIGHT: 612 for (loc = str - 1; loc >= startp;) { 613 if (patmatch(str, loc, quotes)) { 614 amount = loc - expdest; 615 STADJUST(amount, expdest); 616 return 1; 617 } 618 loc--; 619 if (quotes && loc > startp && *(loc - 1) == CTLESC) { 620 for (q = startp; q < loc; q++) 621 if (*q == CTLESC) 622 q++; 623 if (q > loc) 624 loc--; 625 } 626 } 627 return 0; 628 629 case VSTRIMRIGHTMAX: 630 for (loc = startp; loc < str - 1; loc++) { 631 if (patmatch(str, loc, quotes)) { 632 amount = loc - expdest; 633 STADJUST(amount, expdest); 634 return 1; 635 } 636 if (quotes && *loc == CTLESC) 637 loc++; 638 } 639 return 0; 640 641 642 default: 643 abort(); 644 } 645 646recordleft: 647 amount = ((str - 1) - (loc - startp)) - expdest; 648 STADJUST(amount, expdest); 649 while (loc != str - 1) 650 *startp++ = *loc++; 651 return 1; 652} 653 654 655/* 656 * Expand a variable, and return a pointer to the next character in the 657 * input string. 658 */ 659 660static char * 661evalvar(char *p, int flag) 662{ 663 int subtype; 664 int varflags; 665 char *var; 666 char *val; 667 int patloc; 668 int c; 669 int set; 670 int special; 671 int startloc; 672 int varlen; 673 int varlenb; 674 int easy; 675 int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 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; 684again: /* jump here after setting a variable with ${var=text} */ 685 if (varflags & VSLINENO) { 686 set = 1; 687 special = 0; 688 val = var; 689 p[-1] = '\0'; /* temporarily overwrite '=' to have \0 690 terminated string */ 691 } else if (special) { 692 set = varisset(var, varflags & VSNUL); 693 val = NULL; 694 } else { 695 val = bltinlookup(var, 1); 696 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 697 val = NULL; 698 set = 0; 699 } else 700 set = 1; 701 } 702 varlen = 0; 703 startloc = expdest - stackblock(); 704 if (!set && uflag && *var != '@' && *var != '*') { 705 switch (subtype) { 706 case VSNORMAL: 707 case VSTRIMLEFT: 708 case VSTRIMLEFTMAX: 709 case VSTRIMRIGHT: 710 case VSTRIMRIGHTMAX: 711 case VSLENGTH: 712 error("%.*s: parameter not set", (int)(p - var - 1), 713 var); 714 } 715 } 716 if (set && subtype != VSPLUS) { 717 /* insert the value of the variable */ 718 if (special) { 719 varvalue(var, varflags & VSQUOTE, subtype, flag); 720 if (subtype == VSLENGTH) { 721 varlenb = expdest - stackblock() - startloc; 722 varlen = varlenb; 723 if (localeisutf8) { 724 val = stackblock() + startloc; 725 for (;val != expdest; val++) 726 if ((*val & 0xC0) == 0x80) 727 varlen--; 728 } 729 STADJUST(-varlenb, expdest); 730 } 731 } else { 732 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 733 : BASESYNTAX; 734 735 if (subtype == VSLENGTH) { 736 for (;*val; val++) 737 if (!localeisutf8 || 738 (*val & 0xC0) != 0x80) 739 varlen++; 740 } 741 else { 742 if (quotes) 743 STPUTS_QUOTES(val, syntax, expdest); 744 else 745 STPUTS(val, expdest); 746 747 } 748 } 749 } 750 751 if (subtype == VSPLUS) 752 set = ! set; 753 754 easy = ((varflags & VSQUOTE) == 0 || 755 (*var == '@' && shellparam.nparam != 1)); 756 757 758 switch (subtype) { 759 case VSLENGTH: 760 expdest = cvtnum(varlen, expdest); 761 goto record; 762 763 case VSNORMAL: 764 if (!easy) 765 break; 766record: 767 recordregion(startloc, expdest - stackblock(), 768 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' && 769 (*var == '@' || *var == '*'))); 770 break; 771 772 case VSPLUS: 773 case VSMINUS: 774 if (!set) { 775 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 776 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 777 break; 778 } 779 if (easy) 780 goto record; 781 break; 782 783 case VSTRIMLEFT: 784 case VSTRIMLEFTMAX: 785 case VSTRIMRIGHT: 786 case VSTRIMRIGHTMAX: 787 if (!set) 788 break; 789 /* 790 * Terminate the string and start recording the pattern 791 * right after it 792 */ 793 STPUTC('\0', expdest); 794 patloc = expdest - stackblock(); 795 if (subevalvar(p, NULL, patloc, subtype, 796 startloc, varflags, quotes) == 0) { 797 int amount = (expdest - stackblock() - patloc) + 1; 798 STADJUST(-amount, expdest); 799 } 800 /* Remove any recorded regions beyond start of variable */ 801 removerecordregions(startloc); 802 goto record; 803 804 case VSASSIGN: 805 case VSQUESTION: 806 if (!set) { 807 if (subevalvar(p, var, 0, subtype, startloc, varflags, 808 quotes)) { 809 varflags &= ~VSNUL; 810 /* 811 * Remove any recorded regions beyond 812 * start of variable 813 */ 814 removerecordregions(startloc); 815 goto again; 816 } 817 break; 818 } 819 if (easy) 820 goto record; 821 break; 822 823 case VSERROR: 824 c = p - var - 1; 825 error("${%.*s%s}: Bad substitution", c, var, 826 (c > 0 && *p != CTLENDVAR) ? "..." : ""); 827 828 default: 829 abort(); 830 } 831 p[-1] = '='; /* recover overwritten '=' */ 832 833 if (subtype != VSNORMAL) { /* skip to end of alternative */ 834 int nesting = 1; 835 for (;;) { 836 if ((c = *p++) == CTLESC) 837 p++; 838 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 839 if (set) 840 argbackq = argbackq->next; 841 } else if (c == CTLVAR) { 842 if ((*p++ & VSTYPE) != VSNORMAL) 843 nesting++; 844 } else if (c == CTLENDVAR) { 845 if (--nesting == 0) 846 break; 847 } 848 } 849 } 850 return p; 851} 852 853 854 855/* 856 * Test whether a specialized variable is set. 857 */ 858 859static int 860varisset(char *name, int nulok) 861{ 862 863 if (*name == '!') 864 return backgndpidset(); 865 else if (*name == '@' || *name == '*') { 866 if (*shellparam.p == NULL) 867 return 0; 868 869 if (nulok) { 870 char **av; 871 872 for (av = shellparam.p; *av; av++) 873 if (**av != '\0') 874 return 1; 875 return 0; 876 } 877 } else if (is_digit(*name)) { 878 char *ap; 879 int num = atoi(name); 880 881 if (num > shellparam.nparam) 882 return 0; 883 884 if (num == 0) 885 ap = arg0; 886 else 887 ap = shellparam.p[num - 1]; 888 889 if (nulok && (ap == NULL || *ap == '\0')) 890 return 0; 891 } 892 return 1; 893} 894 895static void 896strtodest(const char *p, int flag, int subtype, int quoted) 897{ 898 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 899 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 900 else 901 STPUTS(p, expdest); 902} 903 904/* 905 * Add the value of a specialized variable to the stack string. 906 */ 907 908static void 909varvalue(char *name, int quoted, int subtype, int flag) 910{ 911 int num; 912 char *p; 913 int i; 914 char sep; 915 char **ap; 916 917 switch (*name) { 918 case '$': 919 num = rootpid; 920 goto numvar; 921 case '?': 922 num = oexitstatus; 923 goto numvar; 924 case '#': 925 num = shellparam.nparam; 926 goto numvar; 927 case '!': 928 num = backgndpidval(); 929numvar: 930 expdest = cvtnum(num, expdest); 931 break; 932 case '-': 933 for (i = 0 ; i < NOPTS ; i++) { 934 if (optlist[i].val) 935 STPUTC(optlist[i].letter, expdest); 936 } 937 break; 938 case '@': 939 if (flag & EXP_FULL && quoted) { 940 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 941 strtodest(p, flag, subtype, quoted); 942 if (*ap) 943 STPUTC('\0', expdest); 944 } 945 break; 946 } 947 /* FALLTHROUGH */ 948 case '*': 949 if (ifsset()) 950 sep = ifsval()[0]; 951 else 952 sep = ' '; 953 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 954 strtodest(p, flag, subtype, quoted); 955 if (!*ap) 956 break; 957 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0')) 958 STPUTC(sep, expdest); 959 } 960 break; 961 case '0': 962 p = arg0; 963 strtodest(p, flag, subtype, quoted); 964 break; 965 default: 966 if (is_digit(*name)) { 967 num = atoi(name); 968 if (num > 0 && num <= shellparam.nparam) { 969 p = shellparam.p[num - 1]; 970 strtodest(p, flag, subtype, quoted); 971 } 972 } 973 break; 974 } 975} 976 977 978 979/* 980 * Record the fact that we have to scan this region of the 981 * string for IFS characters. 982 */ 983 984static void 985recordregion(int start, int end, int inquotes) 986{ 987 struct ifsregion *ifsp; 988 989 if (ifslastp == NULL) { 990 ifsp = &ifsfirst; 991 } else { 992 if (ifslastp->endoff == start 993 && ifslastp->inquotes == inquotes) { 994 /* extend previous area */ 995 ifslastp->endoff = end; 996 return; 997 } 998 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 999 ifslastp->next = ifsp; 1000 } 1001 ifslastp = ifsp; 1002 ifslastp->next = NULL; 1003 ifslastp->begoff = start; 1004 ifslastp->endoff = end; 1005 ifslastp->inquotes = inquotes; 1006} 1007 1008 1009 1010/* 1011 * Break the argument string into pieces based upon IFS and add the 1012 * strings to the argument list. The regions of the string to be 1013 * searched for IFS characters have been stored by recordregion. 1014 * CTLESC characters are preserved but have little effect in this pass 1015 * other than escaping CTL* characters. In particular, they do not escape 1016 * IFS characters: that should be done with the ifsregion mechanism. 1017 * CTLQUOTEMARK characters are used to preserve empty quoted strings. 1018 * This pass treats them as a regular character, making the string non-empty. 1019 * Later, they are removed along with the other CTL* characters. 1020 */ 1021static void 1022ifsbreakup(char *string, struct arglist *arglist) 1023{ 1024 struct ifsregion *ifsp; 1025 struct strlist *sp; 1026 char *start; 1027 char *p; 1028 char *q; 1029 const char *ifs; 1030 const char *ifsspc; 1031 int had_param_ch = 0; 1032 1033 start = string; 1034 1035 if (ifslastp == NULL) { 1036 /* Return entire argument, IFS doesn't apply to any of it */ 1037 sp = (struct strlist *)stalloc(sizeof *sp); 1038 sp->text = start; 1039 *arglist->lastp = sp; 1040 arglist->lastp = &sp->next; 1041 return; 1042 } 1043 1044 ifs = ifsset() ? ifsval() : " \t\n"; 1045 1046 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1047 p = string + ifsp->begoff; 1048 while (p < string + ifsp->endoff) { 1049 q = p; 1050 if (*p == CTLESC) 1051 p++; 1052 if (ifsp->inquotes) { 1053 /* Only NULs (should be from "$@") end args */ 1054 had_param_ch = 1; 1055 if (*p != 0) { 1056 p++; 1057 continue; 1058 } 1059 ifsspc = NULL; 1060 } else { 1061 if (!strchr(ifs, *p)) { 1062 had_param_ch = 1; 1063 p++; 1064 continue; 1065 } 1066 ifsspc = strchr(" \t\n", *p); 1067 1068 /* Ignore IFS whitespace at start */ 1069 if (q == start && ifsspc != NULL) { 1070 p++; 1071 start = p; 1072 continue; 1073 } 1074 had_param_ch = 0; 1075 } 1076 1077 /* Save this argument... */ 1078 *q = '\0'; 1079 sp = (struct strlist *)stalloc(sizeof *sp); 1080 sp->text = start; 1081 *arglist->lastp = sp; 1082 arglist->lastp = &sp->next; 1083 p++; 1084 1085 if (ifsspc != NULL) { 1086 /* Ignore further trailing IFS whitespace */ 1087 for (; p < string + ifsp->endoff; p++) { 1088 q = p; 1089 if (*p == CTLESC) 1090 p++; 1091 if (strchr(ifs, *p) == NULL) { 1092 p = q; 1093 break; 1094 } 1095 if (strchr(" \t\n", *p) == NULL) { 1096 p++; 1097 break; 1098 } 1099 } 1100 } 1101 start = p; 1102 } 1103 } 1104 1105 /* 1106 * Save anything left as an argument. 1107 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1108 * generating 2 arguments, the second of which is empty. 1109 * Some recent clarification of the Posix spec say that it 1110 * should only generate one.... 1111 */ 1112 if (had_param_ch || *start != 0) { 1113 sp = (struct strlist *)stalloc(sizeof *sp); 1114 sp->text = start; 1115 *arglist->lastp = sp; 1116 arglist->lastp = &sp->next; 1117 } 1118} 1119 1120 1121static char expdir[PATH_MAX]; 1122#define expdir_end (expdir + sizeof(expdir)) 1123 1124/* 1125 * Perform pathname generation and remove control characters. 1126 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1127 * The results are stored in the list exparg. 1128 */ 1129static void 1130expandmeta(struct strlist *str, int flag __unused) 1131{ 1132 char *p; 1133 struct strlist **savelastp; 1134 struct strlist *sp; 1135 char c; 1136 /* TODO - EXP_REDIR */ 1137 1138 while (str) { 1139 if (fflag) 1140 goto nometa; 1141 p = str->text; 1142 for (;;) { /* fast check for meta chars */ 1143 if ((c = *p++) == '\0') 1144 goto nometa; 1145 if (c == '*' || c == '?' || c == '[') 1146 break; 1147 } 1148 savelastp = exparg.lastp; 1149 INTOFF; 1150 expmeta(expdir, str->text); 1151 INTON; 1152 if (exparg.lastp == savelastp) { 1153 /* 1154 * no matches 1155 */ 1156nometa: 1157 *exparg.lastp = str; 1158 rmescapes(str->text); 1159 exparg.lastp = &str->next; 1160 } else { 1161 *exparg.lastp = NULL; 1162 *savelastp = sp = expsort(*savelastp); 1163 while (sp->next != NULL) 1164 sp = sp->next; 1165 exparg.lastp = &sp->next; 1166 } 1167 str = str->next; 1168 } 1169} 1170 1171 1172/* 1173 * Do metacharacter (i.e. *, ?, [...]) expansion. 1174 */ 1175 1176static void 1177expmeta(char *enddir, char *name) 1178{ 1179 char *p; 1180 char *q; 1181 char *start; 1182 char *endname; 1183 int metaflag; 1184 struct stat statb; 1185 DIR *dirp; 1186 struct dirent *dp; 1187 int atend; 1188 int matchdot; 1189 int esc; 1190 1191 metaflag = 0; 1192 start = name; 1193 for (p = name; esc = 0, *p; p += esc + 1) { 1194 if (*p == '*' || *p == '?') 1195 metaflag = 1; 1196 else if (*p == '[') { 1197 q = p + 1; 1198 if (*q == '!' || *q == '^') 1199 q++; 1200 for (;;) { 1201 while (*q == CTLQUOTEMARK) 1202 q++; 1203 if (*q == CTLESC) 1204 q++; 1205 if (*q == '/' || *q == '\0') 1206 break; 1207 if (*++q == ']') { 1208 metaflag = 1; 1209 break; 1210 } 1211 } 1212 } else if (*p == '\0') 1213 break; 1214 else if (*p == CTLQUOTEMARK) 1215 continue; 1216 else { 1217 if (*p == CTLESC) 1218 esc++; 1219 if (p[esc] == '/') { 1220 if (metaflag) 1221 break; 1222 start = p + esc + 1; 1223 } 1224 } 1225 } 1226 if (metaflag == 0) { /* we've reached the end of the file name */ 1227 if (enddir != expdir) 1228 metaflag++; 1229 for (p = name ; ; p++) { 1230 if (*p == CTLQUOTEMARK) 1231 continue; 1232 if (*p == CTLESC) 1233 p++; 1234 *enddir++ = *p; 1235 if (*p == '\0') 1236 break; 1237 if (enddir == expdir_end) 1238 return; 1239 } 1240 if (metaflag == 0 || lstat(expdir, &statb) >= 0) 1241 addfname(expdir); 1242 return; 1243 } 1244 endname = p; 1245 if (start != name) { 1246 p = name; 1247 while (p < start) { 1248 while (*p == CTLQUOTEMARK) 1249 p++; 1250 if (*p == CTLESC) 1251 p++; 1252 *enddir++ = *p++; 1253 if (enddir == expdir_end) 1254 return; 1255 } 1256 } 1257 if (enddir == expdir) { 1258 p = "."; 1259 } else if (enddir == expdir + 1 && *expdir == '/') { 1260 p = "/"; 1261 } else { 1262 p = expdir; 1263 enddir[-1] = '\0'; 1264 } 1265 if ((dirp = opendir(p)) == NULL) 1266 return; 1267 if (enddir != expdir) 1268 enddir[-1] = '/'; 1269 if (*endname == 0) { 1270 atend = 1; 1271 } else { 1272 atend = 0; 1273 *endname = '\0'; 1274 endname += esc + 1; 1275 } 1276 matchdot = 0; 1277 p = start; 1278 while (*p == CTLQUOTEMARK) 1279 p++; 1280 if (*p == CTLESC) 1281 p++; 1282 if (*p == '.') 1283 matchdot++; 1284 while (! int_pending() && (dp = readdir(dirp)) != NULL) { 1285 if (dp->d_name[0] == '.' && ! matchdot) 1286 continue; 1287 if (patmatch(start, dp->d_name, 0)) { 1288 if (enddir + dp->d_namlen + 1 > expdir_end) 1289 continue; 1290 memcpy(enddir, dp->d_name, dp->d_namlen + 1); 1291 if (atend) 1292 addfname(expdir); 1293 else { 1294 if (enddir + dp->d_namlen + 2 > expdir_end) 1295 continue; 1296 enddir[dp->d_namlen] = '/'; 1297 enddir[dp->d_namlen + 1] = '\0'; 1298 expmeta(enddir + dp->d_namlen + 1, endname); 1299 } 1300 } 1301 } 1302 closedir(dirp); 1303 if (! atend) 1304 endname[-esc - 1] = esc ? CTLESC : '/'; 1305} 1306 1307 1308/* 1309 * Add a file name to the list. 1310 */ 1311 1312static void 1313addfname(char *name) 1314{ 1315 char *p; 1316 struct strlist *sp; 1317 1318 p = stalloc(strlen(name) + 1); 1319 scopy(name, p); 1320 sp = (struct strlist *)stalloc(sizeof *sp); 1321 sp->text = p; 1322 *exparg.lastp = sp; 1323 exparg.lastp = &sp->next; 1324} 1325 1326 1327/* 1328 * Sort the results of file name expansion. It calculates the number of 1329 * strings to sort and then calls msort (short for merge sort) to do the 1330 * work. 1331 */ 1332 1333static struct strlist * 1334expsort(struct strlist *str) 1335{ 1336 int len; 1337 struct strlist *sp; 1338 1339 len = 0; 1340 for (sp = str ; sp ; sp = sp->next) 1341 len++; 1342 return msort(str, len); 1343} 1344 1345 1346static struct strlist * 1347msort(struct strlist *list, int len) 1348{ 1349 struct strlist *p, *q = NULL; 1350 struct strlist **lpp; 1351 int half; 1352 int n; 1353 1354 if (len <= 1) 1355 return list; 1356 half = len >> 1; 1357 p = list; 1358 for (n = half ; --n >= 0 ; ) { 1359 q = p; 1360 p = p->next; 1361 } 1362 q->next = NULL; /* terminate first half of list */ 1363 q = msort(list, half); /* sort first half of list */ 1364 p = msort(p, len - half); /* sort second half */ 1365 lpp = &list; 1366 for (;;) { 1367 if (strcmp(p->text, q->text) < 0) { 1368 *lpp = p; 1369 lpp = &p->next; 1370 if ((p = *lpp) == NULL) { 1371 *lpp = q; 1372 break; 1373 } 1374 } else { 1375 *lpp = q; 1376 lpp = &q->next; 1377 if ((q = *lpp) == NULL) { 1378 *lpp = p; 1379 break; 1380 } 1381 } 1382 } 1383 return list; 1384} 1385 1386 1387 1388static wchar_t 1389get_wc(const char **p) 1390{ 1391 wchar_t c; 1392 int chrlen; 1393 1394 chrlen = mbtowc(&c, *p, 4); 1395 if (chrlen == 0) 1396 return 0; 1397 else if (chrlen == -1) 1398 c = 0; 1399 else 1400 *p += chrlen; 1401 return c; 1402} 1403 1404 1405/* 1406 * See if a character matches a character class, starting at the first colon 1407 * of "[:class:]". 1408 * If a valid character class is recognized, a pointer to the next character 1409 * after the final closing bracket is stored into *end, otherwise a null 1410 * pointer is stored into *end. 1411 */ 1412static int 1413match_charclass(const char *p, wchar_t chr, const char **end) 1414{ 1415 char name[20]; 1416 const char *nameend; 1417 wctype_t cclass; 1418 1419 *end = NULL; 1420 p++; 1421 nameend = strstr(p, ":]"); 1422 if (nameend == NULL || nameend - p >= sizeof(name) || nameend == p) 1423 return 0; 1424 memcpy(name, p, nameend - p); 1425 name[nameend - p] = '\0'; 1426 *end = nameend + 2; 1427 cclass = wctype(name); 1428 /* An unknown class matches nothing but is valid nevertheless. */ 1429 if (cclass == 0) 1430 return 0; 1431 return iswctype(chr, cclass); 1432} 1433 1434 1435/* 1436 * Returns true if the pattern matches the string. 1437 */ 1438 1439static int 1440patmatch(const char *pattern, const char *string, int squoted) 1441{ 1442 const char *p, *q, *end; 1443 char c; 1444 wchar_t wc, wc2; 1445 1446 p = pattern; 1447 q = string; 1448 for (;;) { 1449 switch (c = *p++) { 1450 case '\0': 1451 goto breakloop; 1452 case CTLESC: 1453 if (squoted && *q == CTLESC) 1454 q++; 1455 if (*q++ != *p++) 1456 return 0; 1457 break; 1458 case CTLQUOTEMARK: 1459 continue; 1460 case '?': 1461 if (squoted && *q == CTLESC) 1462 q++; 1463 if (localeisutf8) 1464 wc = get_wc(&q); 1465 else 1466 wc = (unsigned char)*q++; 1467 if (wc == '\0') 1468 return 0; 1469 break; 1470 case '*': 1471 c = *p; 1472 while (c == CTLQUOTEMARK || c == '*') 1473 c = *++p; 1474 if (c != CTLESC && c != CTLQUOTEMARK && 1475 c != '?' && c != '*' && c != '[') { 1476 while (*q != c) { 1477 if (squoted && *q == CTLESC && 1478 q[1] == c) 1479 break; 1480 if (*q == '\0') 1481 return 0; 1482 if (squoted && *q == CTLESC) 1483 q++; 1484 q++; 1485 } 1486 } 1487 do { 1488 if (patmatch(p, q, squoted)) 1489 return 1; 1490 if (squoted && *q == CTLESC) 1491 q++; 1492 } while (*q++ != '\0'); 1493 return 0; 1494 case '[': { 1495 const char *endp; 1496 int invert, found; 1497 wchar_t chr; 1498 1499 endp = p; 1500 if (*endp == '!' || *endp == '^') 1501 endp++; 1502 for (;;) { 1503 while (*endp == CTLQUOTEMARK) 1504 endp++; 1505 if (*endp == '\0') 1506 goto dft; /* no matching ] */ 1507 if (*endp == CTLESC) 1508 endp++; 1509 if (*++endp == ']') 1510 break; 1511 } 1512 invert = 0; 1513 if (*p == '!' || *p == '^') { 1514 invert++; 1515 p++; 1516 } 1517 found = 0; 1518 if (squoted && *q == CTLESC) 1519 q++; 1520 if (localeisutf8) 1521 chr = get_wc(&q); 1522 else 1523 chr = (unsigned char)*q++; 1524 if (chr == '\0') 1525 return 0; 1526 c = *p++; 1527 do { 1528 if (c == CTLQUOTEMARK) 1529 continue; 1530 if (c == '[' && *p == ':') { 1531 found |= match_charclass(p, chr, &end); 1532 if (end != NULL) 1533 p = end; 1534 } 1535 if (c == CTLESC) 1536 c = *p++; 1537 if (localeisutf8 && c & 0x80) { 1538 p--; 1539 wc = get_wc(&p); 1540 if (wc == 0) /* bad utf-8 */ 1541 return 0; 1542 } else 1543 wc = (unsigned char)c; 1544 if (*p == '-' && p[1] != ']') { 1545 p++; 1546 while (*p == CTLQUOTEMARK) 1547 p++; 1548 if (*p == CTLESC) 1549 p++; 1550 if (localeisutf8) { 1551 wc2 = get_wc(&p); 1552 if (wc2 == 0) /* bad utf-8 */ 1553 return 0; 1554 } else 1555 wc2 = (unsigned char)*p++; 1556 if ( collate_range_cmp(chr, wc) >= 0 1557 && collate_range_cmp(chr, wc2) <= 0 1558 ) 1559 found = 1; 1560 } else { 1561 if (chr == wc) 1562 found = 1; 1563 } 1564 } while ((c = *p++) != ']'); 1565 if (found == invert) 1566 return 0; 1567 break; 1568 } 1569dft: default: 1570 if (squoted && *q == CTLESC) 1571 q++; 1572 if (*q++ != c) 1573 return 0; 1574 break; 1575 } 1576 } 1577breakloop: 1578 if (*q != '\0') 1579 return 0; 1580 return 1; 1581} 1582 1583 1584 1585/* 1586 * Remove any CTLESC and CTLQUOTEMARK characters from a string. 1587 */ 1588 1589void 1590rmescapes(char *str) 1591{ 1592 char *p, *q; 1593 1594 p = str; 1595 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 1596 if (*p++ == '\0') 1597 return; 1598 } 1599 q = p; 1600 while (*p) { 1601 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 1602 p++; 1603 continue; 1604 } 1605 if (*p == CTLESC) 1606 p++; 1607 *q++ = *p++; 1608 } 1609 *q = '\0'; 1610} 1611 1612 1613 1614/* 1615 * See if a pattern matches in a case statement. 1616 */ 1617 1618int 1619casematch(union node *pattern, const char *val) 1620{ 1621 struct stackmark smark; 1622 int result; 1623 char *p; 1624 1625 setstackmark(&smark); 1626 argbackq = pattern->narg.backquote; 1627 STARTSTACKSTR(expdest); 1628 ifslastp = NULL; 1629 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 1630 STPUTC('\0', expdest); 1631 p = grabstackstr(expdest); 1632 result = patmatch(p, val, 0); 1633 popstackmark(&smark); 1634 return result; 1635} 1636 1637/* 1638 * Our own itoa(). 1639 */ 1640 1641static char * 1642cvtnum(int num, char *buf) 1643{ 1644 char temp[32]; 1645 int neg = num < 0; 1646 char *p = temp + 31; 1647 1648 temp[31] = '\0'; 1649 1650 do { 1651 *--p = num % 10 + '0'; 1652 } while ((num /= 10) != 0); 1653 1654 if (neg) 1655 *--p = '-'; 1656 1657 STPUTS(p, buf); 1658 return buf; 1659} 1660 1661/* 1662 * Do most of the work for wordexp(3). 1663 */ 1664 1665int 1666wordexpcmd(int argc, char **argv) 1667{ 1668 size_t len; 1669 int i; 1670 1671 out1fmt("%08x", argc - 1); 1672 for (i = 1, len = 0; i < argc; i++) 1673 len += strlen(argv[i]); 1674 out1fmt("%08x", (int)len); 1675 for (i = 1; i < argc; i++) 1676 outbin(argv[i], strlen(argv[i]) + 1, out1); 1677 return (0); 1678} 1679