sh.exp.c revision 302408
1/* $Header: /p/tcsh/cvsroot/tcsh/sh.exp.c,v 3.58 2011/12/25 15:21:50 christos Exp $ */ 2/* 3 * sh.exp.c: Expression evaluations 4 */ 5/*- 6 * Copyright (c) 1980, 1991 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33#include "sh.h" 34 35RCSID("$tcsh: sh.exp.c,v 3.58 2011/12/25 15:21:50 christos Exp $") 36 37#include "tw.h" 38 39/* 40 * C shell 41 */ 42 43#define TEXP_IGNORE 1 /* in ignore, it means to ignore value, just parse */ 44#define TEXP_NOGLOB 2 /* in ignore, it means not to globone */ 45 46#define ADDOP 1 47#define MULOP 2 48#define EQOP 4 49#define RELOP 8 50#define RESTOP 16 51#define ANYOP 31 52 53#define EQEQ 1 54#define GTR 2 55#define LSS 4 56#define NOTEQ 6 57#define EQMATCH 7 58#define NOTEQMATCH 8 59 60static int sh_access (const Char *, int); 61static tcsh_number_t exp1 (Char ***, int); 62static tcsh_number_t exp2x (Char ***, int); 63static tcsh_number_t exp2a (Char ***, int); 64static tcsh_number_t exp2b (Char ***, int); 65static tcsh_number_t exp2c (Char ***, int); 66static Char *exp3 (Char ***, int); 67static Char *exp3a (Char ***, int); 68static Char *exp4 (Char ***, int); 69static Char *exp5 (Char ***, int); 70static Char *exp6 (Char ***, int); 71static void evalav (Char **); 72static int isa (Char *, int); 73static tcsh_number_t egetn (const Char *); 74 75#ifdef EDEBUG 76static void etracc (const char *, const Char *, Char ***); 77static void etraci (const char *, tcsh_number_t, Char ***); 78#else /* !EDEBUG */ 79#define etracc(A, B, C) ((void)0) 80#define etraci(A, B, C) ((void)0) 81#endif /* !EDEBUG */ 82 83/* 84 * shell access function according to POSIX and non POSIX 85 * From Beto Appleton (beto@aixwiz.aix.ibm.com) 86 */ 87static int 88sh_access(const Char *fname, int mode) 89{ 90#if defined(POSIX) && !defined(USE_ACCESS) 91 struct stat statb; 92#endif /* POSIX */ 93 char *name = short2str(fname); 94 95 if (*name == '\0') 96 return 1; 97 98#if !defined(POSIX) || defined(USE_ACCESS) 99 return access(name, mode); 100#else /* POSIX */ 101 102 /* 103 * POSIX 1003.2-d11.2 104 * -r file True if file exists and is readable. 105 * -w file True if file exists and is writable. 106 * True shall indicate only that the write flag is on. 107 * The file shall not be writable on a read-only file 108 * system even if this test indicates true. 109 * -x file True if file exists and is executable. 110 * True shall indicate only that the execute flag is on. 111 * If file is a directory, true indicates that the file 112 * can be searched. 113 */ 114 if (mode != W_OK && mode != X_OK) 115 return access(name, mode); 116 117 if (stat(name, &statb) == -1) 118 return 1; 119 120 if (access(name, mode) == 0) { 121#ifdef S_ISDIR 122 if (S_ISDIR(statb.st_mode) && mode == X_OK) 123 return 0; 124#endif /* S_ISDIR */ 125 126 /* root needs permission for someone */ 127 switch (mode) { 128 case W_OK: 129 mode = S_IWUSR | S_IWGRP | S_IWOTH; 130 break; 131 case X_OK: 132 mode = S_IXUSR | S_IXGRP | S_IXOTH; 133 break; 134 default: 135 abort(); 136 break; 137 } 138 139 } 140 141 else if (euid == statb.st_uid) 142 mode <<= 6; 143 144 else if (egid == statb.st_gid) 145 mode <<= 3; 146 147# ifdef NGROUPS_MAX 148 else { 149 /* you can be in several groups */ 150 long n; 151 GETGROUPS_T *groups; 152 153 /* 154 * Try these things to find a positive maximum groups value: 155 * 1) sysconf(_SC_NGROUPS_MAX) 156 * 2) NGROUPS_MAX 157 * 3) getgroups(0, unused) 158 * Then allocate and scan the groups array if one of these worked. 159 */ 160# if defined (HAVE_SYSCONF) && defined (_SC_NGROUPS_MAX) 161 if ((n = sysconf(_SC_NGROUPS_MAX)) == -1) 162# endif /* _SC_NGROUPS_MAX */ 163 n = NGROUPS_MAX; 164 if (n <= 0) 165 n = getgroups(0, (GETGROUPS_T *) NULL); 166 167 if (n > 0) { 168 groups = xmalloc(n * sizeof(*groups)); 169 n = getgroups((int) n, groups); 170 while (--n >= 0) 171 if (groups[n] == statb.st_gid) { 172 mode <<= 3; 173 break; 174 } 175 } 176 } 177# endif /* NGROUPS_MAX */ 178 179 if (statb.st_mode & mode) 180 return 0; 181 else 182 return 1; 183#endif /* !POSIX */ 184} 185 186tcsh_number_t 187expr(Char ***vp) 188{ 189 return (exp0(vp, 0)); 190} 191 192tcsh_number_t 193exp0(Char ***vp, int ignore) 194{ 195 tcsh_number_t p1 = exp1(vp, ignore); 196 197 etraci("exp0 p1", p1, vp); 198 while (**vp && eq(**vp, STRor2)) { 199 int p2; 200 201 (*vp)++; 202 203 p2 = compat_expr ? 204 exp0(vp, (ignore & TEXP_IGNORE) || p1) : 205 exp1(vp, (ignore & TEXP_IGNORE) || p1); 206 if (compat_expr || !(ignore & TEXP_IGNORE)) 207 p1 = (p1 || p2); 208 etraci("exp0 p1", p1, vp); 209 if (compat_expr) 210 break; 211 } 212 return (p1); 213} 214 215static tcsh_number_t 216exp1(Char ***vp, int ignore) 217{ 218 tcsh_number_t p1 = exp2x(vp, ignore); 219 220 etraci("exp1 p1", p1, vp); 221 while (**vp && eq(**vp, STRand2)) { 222 tcsh_number_t p2; 223 224 (*vp)++; 225 p2 = compat_expr ? 226 exp1(vp, (ignore & TEXP_IGNORE) || !p1) : 227 exp2x(vp, (ignore & TEXP_IGNORE) || !p1); 228 229 etraci("exp1 p2", p2, vp); 230 if (compat_expr || !(ignore & TEXP_IGNORE)) 231 p1 = (p1 && p2); 232 etraci("exp1 p1", p1, vp); 233 if (compat_expr) 234 break; 235 } 236 return (p1); 237} 238 239static tcsh_number_t 240exp2x(Char ***vp, int ignore) 241{ 242 tcsh_number_t p1 = exp2a(vp, ignore); 243 244 etraci("exp2x p1", p1, vp); 245 while (**vp && eq(**vp, STRor)) { 246 tcsh_number_t p2; 247 248 (*vp)++; 249 p2 = compat_expr ? 250 exp2x(vp, ignore) : 251 exp2a(vp, ignore); 252 etraci("exp2x p2", p2, vp); 253 if (compat_expr || !(ignore & TEXP_IGNORE)) 254 p1 = (p1 | p2); 255 etraci("exp2x p1", p1, vp); 256 if (compat_expr) 257 break; 258 } 259 return (p1); 260} 261 262static tcsh_number_t 263exp2a(Char ***vp, int ignore) 264{ 265 tcsh_number_t p1 = exp2b(vp, ignore); 266 267 etraci("exp2a p1", p1, vp); 268 while (**vp && eq(**vp, STRcaret)) { 269 tcsh_number_t p2; 270 271 (*vp)++; 272 p2 = compat_expr ? 273 exp2a(vp, ignore) : 274 exp2b(vp, ignore); 275 etraci("exp2a p2", p2, vp); 276 if (compat_expr || !(ignore & TEXP_IGNORE)) 277 p1 = (p1 ^ p2); 278 etraci("exp2a p1", p1, vp); 279 if (compat_expr) 280 break; 281 } 282 return (p1); 283} 284 285static tcsh_number_t 286exp2b(Char ***vp, int ignore) 287{ 288 tcsh_number_t p1 = exp2c(vp, ignore); 289 290 etraci("exp2b p1", p1, vp); 291 while (**vp && eq(**vp, STRand)) { 292 tcsh_number_t p2; 293 294 (*vp)++; 295 p2 = compat_expr ? 296 exp2b(vp, ignore) : 297 exp2c(vp, ignore); 298 etraci("exp2b p2", p2, vp); 299 if (compat_expr || !(ignore & TEXP_IGNORE)) 300 p1 = (p1 & p2); 301 etraci("exp2b p1", p1, vp); 302 if (compat_expr) 303 break; 304 } 305 return (p1); 306} 307 308static tcsh_number_t 309exp2c(Char ***vp, int ignore) 310{ 311 Char *p1 = exp3(vp, ignore); 312 Char *p2; 313 tcsh_number_t i; 314 315 cleanup_push(p1, xfree); 316 etracc("exp2c p1", p1, vp); 317 if ((i = isa(**vp, EQOP)) != 0) { 318 (*vp)++; 319 if (i == EQMATCH || i == NOTEQMATCH) 320 ignore |= TEXP_NOGLOB; 321 p2 = exp3(vp, ignore); 322 cleanup_push(p2, xfree); 323 etracc("exp2c p2", p2, vp); 324 if (!(ignore & TEXP_IGNORE)) 325 switch (i) { 326 327 case EQEQ: 328 i = eq(p1, p2); 329 break; 330 331 case NOTEQ: 332 i = !eq(p1, p2); 333 break; 334 335 case EQMATCH: 336 i = Gmatch(p1, p2); 337 break; 338 339 case NOTEQMATCH: 340 i = !Gmatch(p1, p2); 341 break; 342 } 343 cleanup_until(p1); 344 return (i); 345 } 346 i = egetn(p1); 347 cleanup_until(p1); 348 return (i); 349} 350 351static Char * 352exp3(Char ***vp, int ignore) 353{ 354 Char *p1, *p2; 355 tcsh_number_t i; 356 357 p1 = exp3a(vp, ignore); 358 etracc("exp3 p1", p1, vp); 359 while ((i = isa(**vp, RELOP)) != 0) { 360 (*vp)++; 361 if (**vp && eq(**vp, STRequal)) 362 i |= 1, (*vp)++; 363 cleanup_push(p1, xfree); 364 p2 = compat_expr ? 365 exp3(vp, ignore) : 366 exp3a(vp, ignore); 367 cleanup_push(p2, xfree); 368 etracc("exp3 p2", p2, vp); 369 if (!(ignore & TEXP_IGNORE)) 370 switch (i) { 371 372 case GTR: 373 i = egetn(p1) > egetn(p2); 374 break; 375 376 case GTR | 1: 377 i = egetn(p1) >= egetn(p2); 378 break; 379 380 case LSS: 381 i = egetn(p1) < egetn(p2); 382 break; 383 384 case LSS | 1: 385 i = egetn(p1) <= egetn(p2); 386 break; 387 } 388 cleanup_until(p1); 389 p1 = putn(i); 390 etracc("exp3 p1", p1, vp); 391 if (compat_expr) 392 break; 393 } 394 return (p1); 395} 396 397static Char * 398exp3a(Char ***vp, int ignore) 399{ 400 Char *p1, *p2; 401 const Char *op; 402 tcsh_number_t i; 403 404 p1 = exp4(vp, ignore); 405 etracc("exp3a p1", p1, vp); 406 op = **vp; 407 if (op && any("<>", op[0]) && op[0] == op[1]) { 408 (*vp)++; 409 cleanup_push(p1, xfree); 410 p2 = compat_expr ? 411 exp3a(vp, ignore) : 412 exp4(vp, ignore); 413 cleanup_push(p2, xfree); 414 etracc("exp3a p2", p2, vp); 415 if (op[0] == '<') 416 i = egetn(p1) << egetn(p2); 417 else 418 i = egetn(p1) >> egetn(p2); 419 cleanup_until(p1); 420 p1 = putn(i); 421 etracc("exp3a p1", p1, vp); 422 } 423 return (p1); 424} 425 426static Char * 427exp4(Char ***vp, int ignore) 428{ 429 Char *p1, *p2; 430 tcsh_number_t i = 0; 431 432 p1 = exp5(vp, ignore); 433 etracc("exp4 p1", p1, vp); 434 while (isa(**vp, ADDOP)) { 435 const Char *op = *(*vp)++; 436 437 cleanup_push(p1, xfree); 438 p2 = compat_expr ? 439 exp4(vp, ignore) : 440 exp5(vp, ignore); 441 cleanup_push(p2, xfree); 442 etracc("exp4 p2", p2, vp); 443 if (!(ignore & TEXP_IGNORE)) 444 switch (op[0]) { 445 446 case '+': 447 i = egetn(p1) + egetn(p2); 448 break; 449 450 case '-': 451 i = egetn(p1) - egetn(p2); 452 break; 453 } 454 cleanup_until(p1); 455 p1 = putn(i); 456 etracc("exp4 p1", p1, vp); 457 if (compat_expr) 458 break; 459 } 460 return (p1); 461} 462 463static Char * 464exp5(Char ***vp, int ignore) 465{ 466 Char *p1, *p2; 467 tcsh_number_t i = 0; 468 469 p1 = exp6(vp, ignore); 470 etracc("exp5 p1", p1, vp); 471 472 while (isa(**vp, MULOP)) { 473 const Char *op = *(*vp)++; 474 if ((ignore & TEXP_NOGLOB) != 0) { 475 /* 476 * We are just trying to get the right side of 477 * a =~ or !~ operator 478 */ 479 xfree(p1); 480 return Strsave(op); 481 } 482 483 cleanup_push(p1, xfree); 484 p2 = compat_expr ? 485 exp5(vp, ignore) : 486 exp6(vp, ignore); 487 cleanup_push(p2, xfree); 488 etracc("exp5 p2", p2, vp); 489 if (!(ignore & TEXP_IGNORE)) 490 switch (op[0]) { 491 492 case '*': 493 i = egetn(p1) * egetn(p2); 494 break; 495 496 case '/': 497 i = egetn(p2); 498 if (i == 0) 499 stderror(ERR_DIV0); 500 i = egetn(p1) / i; 501 break; 502 503 case '%': 504 i = egetn(p2); 505 if (i == 0) 506 stderror(ERR_MOD0); 507 i = egetn(p1) % i; 508 break; 509 } 510 cleanup_until(p1); 511 p1 = putn(i); 512 etracc("exp5 p1", p1, vp); 513 if (compat_expr) 514 break; 515 } 516 return (p1); 517} 518 519static Char * 520exp6(Char ***vp, int ignore) 521{ 522 tcsh_number_t ccode; 523 tcsh_number_t i = 0; 524 Char *cp; 525 526 if (**vp == 0) 527 stderror(ERR_NAME | ERR_EXPRESSION); 528 if (eq(**vp, STRbang)) { 529 (*vp)++; 530 cp = exp6(vp, ignore); 531 cleanup_push(cp, xfree); 532 etracc("exp6 ! cp", cp, vp); 533 i = egetn(cp); 534 cleanup_until(cp); 535 return (putn(!i)); 536 } 537 if (eq(**vp, STRtilde)) { 538 (*vp)++; 539 cp = exp6(vp, ignore); 540 cleanup_push(cp, xfree); 541 etracc("exp6 ~ cp", cp, vp); 542 i = egetn(cp); 543 cleanup_until(cp); 544 return (putn(~i)); 545 } 546 if (eq(**vp, STRLparen)) { 547 (*vp)++; 548 ccode = exp0(vp, ignore); 549 etraci("exp6 () ccode", ccode, vp); 550 if (**vp == 0 || ***vp != ')') 551 stderror(ERR_NAME | ERR_EXPRESSION); 552 (*vp)++; 553 return (putn(ccode)); 554 } 555 if (eq(**vp, STRLbrace)) { 556 Char **v; 557 struct command faket; 558 Char *fakecom[2]; 559 560 faket.t_dtyp = NODE_COMMAND; 561 faket.t_dflg = F_BACKQ; 562 faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL; 563 faket.t_dcom = fakecom; 564 fakecom[0] = STRfakecom; 565 fakecom[1] = NULL; 566 (*vp)++; 567 v = *vp; 568 for (;;) { 569 if (!**vp) 570 stderror(ERR_NAME | ERR_MISSING, '}'); 571 if (eq(*(*vp)++, STRRbrace)) 572 break; 573 } 574 if (ignore & TEXP_IGNORE) 575 return (Strsave(STRNULL)); 576 psavejob(); 577 cleanup_push(&faket, psavejob_cleanup); /* faket is only a marker */ 578 if (pfork(&faket, -1) == 0) { 579 *--(*vp) = 0; 580 evalav(v); 581 exitstat(); 582 } 583 pwait(); 584 cleanup_until(&faket); 585 etraci("exp6 {} status", egetn(varval(STRstatus)), vp); 586 return (putn(egetn(varval(STRstatus)) == 0)); 587 } 588 if (isa(**vp, ANYOP)) 589 return (Strsave(STRNULL)); 590 cp = *(*vp)++; 591#ifdef convex 592# define FILETESTS "erwxfdzoplstSXLbcugkmKR" 593#else 594# define FILETESTS "erwxfdzoplstSXLbcugkmK" 595#endif /* convex */ 596#define FILEVALS "ZAMCDIUGNFPL" 597 if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1]))) 598 return(filetest(cp, vp, ignore)); 599 etracc("exp6 default", cp, vp); 600 return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND)); 601} 602 603 604/* 605 * Extended file tests 606 * From: John Rowe <rowe@excc.exeter.ac.uk> 607 */ 608Char * 609filetest(Char *cp, Char ***vp, int ignore) 610{ 611#ifdef convex 612 struct cvxstat stb, *st = NULL; 613# define TCSH_STAT stat64 614#else 615# define TCSH_STAT stat 616 struct stat stb, *st = NULL; 617#endif /* convex */ 618 619#ifdef S_IFLNK 620# ifdef convex 621 struct cvxstat lstb, *lst = NULL; 622# define TCSH_LSTAT lstat64 623# else 624# define TCSH_LSTAT lstat 625 struct stat lstb, *lst = NULL; 626# endif /* convex */ 627 char *filnam; 628#endif /* S_IFLNK */ 629 630 tcsh_number_t i = 0; 631 unsigned pmask = 0xffff; 632 int altout = 0; 633 Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0', 634 *errval = STR0; 635 char *string, string0[22 + MB_LEN_MAX + 1]; // space for 64 bit octal 636 time_t footime; 637 struct passwd *pw; 638 struct group *gr; 639 640 while(any(FILETESTS, *++ft)) 641 continue; 642 643 if (!*ft && *(ft - 1) == 'L') 644 --ft; 645 646 if (any(FILEVALS, *ft)) { 647 valtest = *ft++; 648 /* 649 * Value tests return '-1' on failure as 0 is 650 * a legitimate value for many of them. 651 * 'F' returns ':' for compatibility. 652 */ 653 errval = valtest == 'F' ? STRcolon : STRminus1; 654 655 if (valtest == 'P' && *ft >= '0' && *ft <= '7') { 656 pmask = (char) *ft - '0'; 657 while ( *++ft >= '0' && *ft <= '7' ) 658 pmask = 8 * pmask + ((char) *ft - '0'); 659 } 660 if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) { 661 altout = 1; 662 ++ft; 663 } 664 } 665 666 if (*ft || ft == cp + 1) 667 stderror(ERR_NAME | ERR_FILEINQ); 668 669 /* 670 * Detect missing file names by checking for operator in the file name 671 * position. However, if an operator name appears there, we must make 672 * sure that there's no file by that name (e.g., "/") before announcing 673 * an error. Even this check isn't quite right, since it doesn't take 674 * globbing into account. 675 */ 676 677 if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb)) 678 stderror(ERR_NAME | ERR_FILENAME); 679 680 dp = *(*vp)++; 681 if (ignore & TEXP_IGNORE) 682 return (Strsave(STRNULL)); 683 ep = globone(dp, G_APPEND); 684 cleanup_push(ep, xfree); 685 ft = &cp[1]; 686 do 687 switch (*ft) { 688 689 case 'r': 690 i = !sh_access(ep, R_OK); 691 break; 692 693 case 'w': 694 i = !sh_access(ep, W_OK); 695 break; 696 697 case 'x': 698 i = !sh_access(ep, X_OK); 699 break; 700 701 case 'X': /* tcsh extension, name is an executable in the path 702 * or a tcsh builtin command 703 */ 704 i = find_cmd(ep, 0); 705 break; 706 707 case 't': /* SGI extension, true when file is a tty */ 708 i = isatty(atoi(short2str(ep))); 709 break; 710 711 default: 712 713#ifdef S_IFLNK 714 if (tolower(*ft) == 'l') { 715 /* 716 * avoid convex compiler bug. 717 */ 718 if (!lst) { 719 lst = &lstb; 720 if (TCSH_LSTAT(short2str(ep), lst) == -1) { 721 cleanup_until(ep); 722 return (Strsave(errval)); 723 } 724 } 725 if (*ft == 'L') 726 st = lst; 727 } 728 else 729#endif /* S_IFLNK */ 730 /* 731 * avoid convex compiler bug. 732 */ 733 if (!st) { 734 st = &stb; 735 if (TCSH_STAT(short2str(ep), st) == -1) { 736 cleanup_until(ep); 737 return (Strsave(errval)); 738 } 739 } 740 741 switch (*ft) { 742 743 case 'f': 744#ifdef S_ISREG 745 i = S_ISREG(st->st_mode); 746#else /* !S_ISREG */ 747 i = 0; 748#endif /* S_ISREG */ 749 break; 750 751 case 'd': 752#ifdef S_ISDIR 753 i = S_ISDIR(st->st_mode); 754#else /* !S_ISDIR */ 755 i = 0; 756#endif /* S_ISDIR */ 757 break; 758 759 case 'p': 760#ifdef S_ISFIFO 761 i = S_ISFIFO(st->st_mode); 762#else /* !S_ISFIFO */ 763 i = 0; 764#endif /* S_ISFIFO */ 765 break; 766 767 case 'm' : 768#ifdef S_ISOFL 769 i = S_ISOFL(st->st_dm_mode); 770#else /* !S_ISOFL */ 771 i = 0; 772#endif /* S_ISOFL */ 773 break ; 774 775 case 'K' : 776#ifdef S_ISOFL 777 i = stb.st_dm_key; 778#else /* !S_ISOFL */ 779 i = 0; 780#endif /* S_ISOFL */ 781 break ; 782 783 784 case 'l': 785#ifdef S_ISLNK 786 i = S_ISLNK(lst->st_mode); 787#else /* !S_ISLNK */ 788 i = 0; 789#endif /* S_ISLNK */ 790 break; 791 792 case 'S': 793# ifdef S_ISSOCK 794 i = S_ISSOCK(st->st_mode); 795# else /* !S_ISSOCK */ 796 i = 0; 797# endif /* S_ISSOCK */ 798 break; 799 800 case 'b': 801#ifdef S_ISBLK 802 i = S_ISBLK(st->st_mode); 803#else /* !S_ISBLK */ 804 i = 0; 805#endif /* S_ISBLK */ 806 break; 807 808 case 'c': 809#ifdef S_ISCHR 810 i = S_ISCHR(st->st_mode); 811#else /* !S_ISCHR */ 812 i = 0; 813#endif /* S_ISCHR */ 814 break; 815 816 case 'u': 817 i = (S_ISUID & st->st_mode) != 0; 818 break; 819 820 case 'g': 821 i = (S_ISGID & st->st_mode) != 0; 822 break; 823 824 case 'k': 825 i = (S_ISVTX & st->st_mode) != 0; 826 break; 827 828 case 'z': 829 i = st->st_size == 0; 830 break; 831 832#ifdef convex 833 case 'R': 834 i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED; 835 break; 836#endif /* convex */ 837 838 case 's': 839 i = stb.st_size != 0; 840 break; 841 842 case 'e': 843 i = 1; 844 break; 845 846 case 'o': 847 i = st->st_uid == uid; 848 break; 849 850 /* 851 * Value operators are a tcsh extension. 852 */ 853 854 case 'D': 855 i = (tcsh_number_t) st->st_dev; 856 break; 857 858 case 'I': 859 i = (tcsh_number_t) st->st_ino; 860 break; 861 862 case 'F': 863 strdev = putn( (int) st->st_dev); 864 strino = putn( (int) st->st_ino); 865 strF = xmalloc((2 + Strlen(strdev) + Strlen(strino)) 866 * sizeof(Char)); 867 (void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino); 868 xfree(strdev); 869 xfree(strino); 870 cleanup_until(ep); 871 return(strF); 872 873 case 'L': 874 if ( *(ft + 1) ) { 875 i = 1; 876 break; 877 } 878#ifdef S_ISLNK 879 filnam = short2str(ep); 880 string = areadlink(filnam); 881 strF = string == NULL ? errval : str2short(string); 882 xfree(string); 883 cleanup_until(ep); 884 return(Strsave(strF)); 885 886#else /* !S_ISLNK */ 887 i = 0; 888 break; 889#endif /* S_ISLNK */ 890 891 892 case 'N': 893 i = (tcsh_number_t) st->st_nlink; 894 break; 895 896 case 'P': 897 string = string0 + 1; 898 (void) xsnprintf(string, sizeof(string0) - 1, "%o", 899 pmask & (unsigned int) 900 ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode)); 901 if (altout && *string != '0') 902 *--string = '0'; 903 cleanup_until(ep); 904 return(Strsave(str2short(string))); 905 906 case 'U': 907 if (altout && (pw = xgetpwuid(st->st_uid))) { 908 cleanup_until(ep); 909 return(Strsave(str2short(pw->pw_name))); 910 } 911 i = (tcsh_number_t) st->st_uid; 912 break; 913 914 case 'G': 915 if (altout && (gr = xgetgrgid(st->st_gid))) { 916 cleanup_until(ep); 917 return(Strsave(str2short(gr->gr_name))); 918 } 919 i = (tcsh_number_t) st->st_gid; 920 break; 921 922 case 'Z': 923 i = (tcsh_number_t) st->st_size; 924 break; 925 926 case 'A': case 'M': case 'C': 927 footime = *ft == 'A' ? st->st_atime : 928 *ft == 'M' ? st->st_mtime : st->st_ctime; 929 if (altout) { 930 strF = str2short(ctime(&footime)); 931 if ((str = Strchr(strF, '\n')) != NULL) 932 *str = (Char) '\0'; 933 cleanup_until(ep); 934 return(Strsave(strF)); 935 } 936 i = (tcsh_number_t) footime; 937 break; 938 939 } 940 } 941 while (*++ft && i); 942 etraci("exp6 -? i", i, vp); 943 cleanup_until(ep); 944 return (putn(i)); 945} 946 947 948static void 949evalav(Char **v) 950{ 951 struct wordent paraml1; 952 struct wordent *hp = ¶ml1; 953 struct command *t; 954 struct wordent *wdp = hp; 955 956 setcopy(STRstatus, STR0, VAR_READWRITE); 957 hp->prev = hp->next = hp; 958 hp->word = STRNULL; 959 while (*v) { 960 struct wordent *new = xcalloc(1, sizeof *wdp); 961 962 new->prev = wdp; 963 new->next = hp; 964 wdp->next = new; 965 wdp = new; 966 wdp->word = Strsave(*v++); 967 } 968 hp->prev = wdp; 969 cleanup_push(¶ml1, lex_cleanup); 970 alias(¶ml1); 971 t = syntax(paraml1.next, ¶ml1, 0); 972 cleanup_push(t, syntax_cleanup); 973 if (seterr) 974 stderror(ERR_OLD); 975 execute(t, -1, NULL, NULL, TRUE); 976 cleanup_until(¶ml1); 977} 978 979static int 980isa(Char *cp, int what) 981{ 982 if (cp == 0) 983 return ((what & RESTOP) != 0); 984 if (*cp == '\0') 985 return 0; 986 if (cp[1] == 0) { 987 if (what & ADDOP && (*cp == '+' || *cp == '-')) 988 return (1); 989 if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%')) 990 return (1); 991 if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' || 992 *cp == '~' || *cp == '^' || *cp == '"')) 993 return (1); 994 } 995 else if (cp[2] == 0) { 996 if (what & RESTOP) { 997 if (cp[0] == '|' && cp[1] == '&') 998 return (1); 999 if (cp[0] == '<' && cp[1] == '<') 1000 return (1); 1001 if (cp[0] == '>' && cp[1] == '>') 1002 return (1); 1003 } 1004 if (what & EQOP) { 1005 if (cp[0] == '=') { 1006 if (cp[1] == '=') 1007 return (EQEQ); 1008 if (cp[1] == '~') 1009 return (EQMATCH); 1010 } 1011 else if (cp[0] == '!') { 1012 if (cp[1] == '=') 1013 return (NOTEQ); 1014 if (cp[1] == '~') 1015 return (NOTEQMATCH); 1016 } 1017 } 1018 } 1019 if (what & RELOP) { 1020 if (*cp == '<') 1021 return (LSS); 1022 if (*cp == '>') 1023 return (GTR); 1024 } 1025 return (0); 1026} 1027 1028static tcsh_number_t 1029egetn(const Char *cp) 1030{ 1031 if (*cp && *cp != '-' && !Isdigit(*cp)) 1032 stderror(ERR_NAME | ERR_EXPRESSION); 1033 return (getn(cp)); 1034} 1035 1036/* Phew! */ 1037 1038#ifdef EDEBUG 1039static void 1040etraci(const char *str, tcsh_number_t i, Char ***vp) 1041{ 1042#ifdef HAVE_LONG_LONG 1043 xprintf("%s=%lld\t", str, i); 1044#else 1045 xprintf("%s=%ld\t", str, i); 1046#endif 1047 blkpr(*vp); 1048 xputchar('\n'); 1049} 1050static void 1051etracc(const char *str, const Char *cp, Char ***vp) 1052{ 1053 xprintf("%s=%S\t", str, cp); 1054 blkpr(*vp); 1055 xputchar('\n'); 1056} 1057#endif /* EDEBUG */ 1058