1 /* $Header: /p/tcsh/cvsroot/tcsh/sh.exp.c,v 3.53 2007/10/01 19:09:28 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 35 RCSID("$tcsh: sh.exp.c,v 3.53 2007/10/01 19:09:28 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 60 static int sh_access (const Char *, int); 61 static int exp1 (Char ***, int); 62 static int exp2x (Char ***, int); 63 static int exp2a (Char ***, int); 64 static int exp2b (Char ***, int); 65 static int exp2c (Char ***, int); 66 static Char *exp3 (Char ***, int); 67 static Char *exp3a (Char ***, int); 68 static Char *exp4 (Char ***, int); 69 static Char *exp5 (Char ***, int); 70 static Char *exp6 (Char ***, int); 71 static void evalav (Char **); 72 static int isa (Char *, int); 73 static int egetn (Char *); 74 75 #ifdef EDEBUG 76 static void etracc (const char *, const Char *, Char ***); 77 static void etraci (const char *, int, 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 */ 87 static int 88 sh_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 } 185 186 int 187 expr(Char ***vp) 188 { 189 return (exp0(vp, 0)); 190 } 191 192 int 193 exp0(Char ***vp, int ignore) 194 { 195 int 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 } 214 215 static int 216 exp1(Char ***vp, int ignore) 217 { 218 int p1 = exp2x(vp, ignore); 219 220 etraci("exp1 p1", p1, vp); 221 while (**vp && eq(**vp, STRand2)) { 222 int 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 } 238 239 static int 240 exp2x(Char ***vp, int ignore) 241 { 242 int p1 = exp2a(vp, ignore); 243 244 etraci("exp2x p1", p1, vp); 245 while (**vp && eq(**vp, STRor)) { 246 int 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 } 261 262 static int 263 exp2a(Char ***vp, int ignore) 264 { 265 int p1 = exp2b(vp, ignore); 266 267 etraci("exp2a p1", p1, vp); 268 while (**vp && eq(**vp, STRcaret)) { 269 int 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 } 284 285 static int 286 exp2b(Char ***vp, int ignore) 287 { 288 int p1 = exp2c(vp, ignore); 289 290 etraci("exp2b p1", p1, vp); 291 while (**vp && eq(**vp, STRand)) { 292 int 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 } 307 308 static int 309 exp2c(Char ***vp, int ignore) 310 { 311 Char *p1 = exp3(vp, ignore); 312 Char *p2; 313 int 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 } 350 351 static Char * 352 exp3(Char ***vp, int ignore) 353 { 354 Char *p1, *p2; 355 int 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 } 396 397 static Char * 398 exp3a(Char ***vp, int ignore) 399 { 400 Char *p1, *p2; 401 const Char *op; 402 int 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 } 425 426 static Char * 427 exp4(Char ***vp, int ignore) 428 { 429 Char *p1, *p2; 430 int 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 } 462 463 static Char * 464 exp5(Char ***vp, int ignore) 465 { 466 Char *p1, *p2; 467 int 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 } 518 519 static Char * 520 exp6(Char ***vp, int ignore) 521 { 522 int ccode, i = 0; 523 Char *cp; 524 525 if (**vp == 0) 526 stderror(ERR_NAME | ERR_EXPRESSION); 527 if (eq(**vp, STRbang)) { 528 (*vp)++; 529 cp = exp6(vp, ignore); 530 cleanup_push(cp, xfree); 531 etracc("exp6 ! cp", cp, vp); 532 i = egetn(cp); 533 cleanup_until(cp); 534 return (putn(!i)); 535 } 536 if (eq(**vp, STRtilde)) { 537 (*vp)++; 538 cp = exp6(vp, ignore); 539 cleanup_push(cp, xfree); 540 etracc("exp6 ~ cp", cp, vp); 541 i = egetn(cp); 542 cleanup_until(cp); 543 return (putn(~i)); 544 } 545 if (eq(**vp, STRLparen)) { 546 (*vp)++; 547 ccode = exp0(vp, ignore); 548 etraci("exp6 () ccode", ccode, vp); 549 if (**vp == 0 || ***vp != ')') 550 stderror(ERR_NAME | ERR_EXPRESSION); 551 (*vp)++; 552 return (putn(ccode)); 553 } 554 if (eq(**vp, STRLbrace)) { 555 Char **v; 556 struct command faket; 557 Char *fakecom[2]; 558 559 faket.t_dtyp = NODE_COMMAND; 560 faket.t_dflg = F_BACKQ; 561 faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL; 562 faket.t_dcom = fakecom; 563 fakecom[0] = STRfakecom; 564 fakecom[1] = NULL; 565 (*vp)++; 566 v = *vp; 567 for (;;) { 568 if (!**vp) 569 stderror(ERR_NAME | ERR_MISSING, '}'); 570 if (eq(*(*vp)++, STRRbrace)) 571 break; 572 } 573 if (ignore & TEXP_IGNORE) 574 return (Strsave(STRNULL)); 575 psavejob(); 576 cleanup_push(&faket, psavejob_cleanup); /* faket is only a marker */ 577 if (pfork(&faket, -1) == 0) { 578 *--(*vp) = 0; 579 evalav(v); 580 exitstat(); 581 } 582 pwait(); 583 cleanup_until(&faket); 584 etraci("exp6 {} status", egetn(varval(STRstatus)), vp); 585 return (putn(egetn(varval(STRstatus)) == 0)); 586 } 587 if (isa(**vp, ANYOP)) 588 return (Strsave(STRNULL)); 589 cp = *(*vp)++; 590 #ifdef convex 591 # define FILETESTS "erwxfdzoplstSXLbcugkmKR" 592 #else 593 # define FILETESTS "erwxfdzoplstSXLbcugkmK" 594 #endif /* convex */ 595 #define FILEVALS "ZAMCDIUGNFPL" 596 if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1]))) 597 return(filetest(cp, vp, ignore)); 598 etracc("exp6 default", cp, vp); 599 return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND)); 600 } 601 602 603 /* 604 * Extended file tests 605 * From: John Rowe <rowe@excc.exeter.ac.uk> 606 */ 607 Char * 608 filetest(Char *cp, Char ***vp, int ignore) 609 { 610 #ifdef convex 611 struct cvxstat stb, *st = NULL; 612 # define TCSH_STAT stat64 613 #else 614 # define TCSH_STAT stat 615 struct stat stb, *st = NULL; 616 #endif /* convex */ 617 618 #ifdef S_IFLNK 619 # ifdef convex 620 struct cvxstat lstb, *lst = NULL; 621 # define TCSH_LSTAT lstat64 622 # else 623 # define TCSH_LSTAT lstat 624 struct stat lstb, *lst = NULL; 625 # endif /* convex */ 626 char *filnam; 627 #endif /* S_IFLNK */ 628 629 int i = 0; 630 unsigned pmask = 0xffff; 631 int altout = 0; 632 Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0', 633 *errval = STR0; 634 char *string, string0[8]; 635 time_t footime; 636 struct passwd *pw; 637 struct group *gr; 638 639 while(any(FILETESTS, *++ft)) 640 continue; 641 642 if (!*ft && *(ft - 1) == 'L') 643 --ft; 644 645 if (any(FILEVALS, *ft)) { 646 valtest = *ft++; 647 /* 648 * Value tests return '-1' on failure as 0 is 649 * a legitimate value for many of them. 650 * 'F' returns ':' for compatibility. 651 */ 652 errval = valtest == 'F' ? STRcolon : STRminus1; 653 654 if (valtest == 'P' && *ft >= '0' && *ft <= '7') { 655 pmask = (char) *ft - '0'; 656 while ( *++ft >= '0' && *ft <= '7' ) 657 pmask = 8 * pmask + ((char) *ft - '0'); 658 } 659 if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) { 660 altout = 1; 661 ++ft; 662 } 663 } 664 665 if (*ft || ft == cp + 1) 666 stderror(ERR_NAME | ERR_FILEINQ); 667 668 /* 669 * Detect missing file names by checking for operator in the file name 670 * position. However, if an operator name appears there, we must make 671 * sure that there's no file by that name (e.g., "/") before announcing 672 * an error. Even this check isn't quite right, since it doesn't take 673 * globbing into account. 674 */ 675 676 if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb)) 677 stderror(ERR_NAME | ERR_FILENAME); 678 679 dp = *(*vp)++; 680 if (ignore & TEXP_IGNORE) 681 return (Strsave(STRNULL)); 682 ep = globone(dp, G_APPEND); 683 cleanup_push(ep, xfree); 684 ft = &cp[1]; 685 do 686 switch (*ft) { 687 688 case 'r': 689 i = !sh_access(ep, R_OK); 690 break; 691 692 case 'w': 693 i = !sh_access(ep, W_OK); 694 break; 695 696 case 'x': 697 i = !sh_access(ep, X_OK); 698 break; 699 700 case 'X': /* tcsh extension, name is an executable in the path 701 * or a tcsh builtin command 702 */ 703 i = find_cmd(ep, 0); 704 break; 705 706 case 't': /* SGI extension, true when file is a tty */ 707 i = isatty(atoi(short2str(ep))); 708 break; 709 710 default: 711 712 #ifdef S_IFLNK 713 if (tolower(*ft) == 'l') { 714 /* 715 * avoid convex compiler bug. 716 */ 717 if (!lst) { 718 lst = &lstb; 719 if (TCSH_LSTAT(short2str(ep), lst) == -1) { 720 cleanup_until(ep); 721 return (Strsave(errval)); 722 } 723 } 724 if (*ft == 'L') 725 st = lst; 726 } 727 else 728 #endif /* S_IFLNK */ 729 /* 730 * avoid convex compiler bug. 731 */ 732 if (!st) { 733 st = &stb; 734 if (TCSH_STAT(short2str(ep), st) == -1) { 735 cleanup_until(ep); 736 return (Strsave(errval)); 737 } 738 } 739 740 switch (*ft) { 741 742 case 'f': 743 #ifdef S_ISREG 744 i = S_ISREG(st->st_mode); 745 #else /* !S_ISREG */ 746 i = 0; 747 #endif /* S_ISREG */ 748 break; 749 750 case 'd': 751 #ifdef S_ISDIR 752 i = S_ISDIR(st->st_mode); 753 #else /* !S_ISDIR */ 754 i = 0; 755 #endif /* S_ISDIR */ 756 break; 757 758 case 'p': 759 #ifdef S_ISFIFO 760 i = S_ISFIFO(st->st_mode); 761 #else /* !S_ISFIFO */ 762 i = 0; 763 #endif /* S_ISFIFO */ 764 break; 765 766 case 'm' : 767 #ifdef S_ISOFL 768 i = S_ISOFL(st->st_dm_mode); 769 #else /* !S_ISOFL */ 770 i = 0; 771 #endif /* S_ISOFL */ 772 break ; 773 774 case 'K' : 775 #ifdef S_ISOFL 776 i = stb.st_dm_key; 777 #else /* !S_ISOFL */ 778 i = 0; 779 #endif /* S_ISOFL */ 780 break ; 781 782 783 case 'l': 784 #ifdef S_ISLNK 785 i = S_ISLNK(lst->st_mode); 786 #else /* !S_ISLNK */ 787 i = 0; 788 #endif /* S_ISLNK */ 789 break; 790 791 case 'S': 792 # ifdef S_ISSOCK 793 i = S_ISSOCK(st->st_mode); 794 # else /* !S_ISSOCK */ 795 i = 0; 796 # endif /* S_ISSOCK */ 797 break; 798 799 case 'b': 800 #ifdef S_ISBLK 801 i = S_ISBLK(st->st_mode); 802 #else /* !S_ISBLK */ 803 i = 0; 804 #endif /* S_ISBLK */ 805 break; 806 807 case 'c': 808 #ifdef S_ISCHR 809 i = S_ISCHR(st->st_mode); 810 #else /* !S_ISCHR */ 811 i = 0; 812 #endif /* S_ISCHR */ 813 break; 814 815 case 'u': 816 i = (S_ISUID & st->st_mode) != 0; 817 break; 818 819 case 'g': 820 i = (S_ISGID & st->st_mode) != 0; 821 break; 822 823 case 'k': 824 i = (S_ISVTX & st->st_mode) != 0; 825 break; 826 827 case 'z': 828 i = st->st_size == 0; 829 break; 830 831 #ifdef convex 832 case 'R': 833 i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED; 834 break; 835 #endif /* convex */ 836 837 case 's': 838 i = stb.st_size != 0; 839 break; 840 841 case 'e': 842 i = 1; 843 break; 844 845 case 'o': 846 i = st->st_uid == uid; 847 break; 848 849 /* 850 * Value operators are a tcsh extension. 851 */ 852 853 case 'D': 854 i = (int) st->st_dev; 855 break; 856 857 case 'I': 858 i = (int) st->st_ino; 859 break; 860 861 case 'F': 862 strdev = putn( (int) st->st_dev); 863 strino = putn( (int) st->st_ino); 864 strF = xmalloc((2 + Strlen(strdev) + Strlen(strino)) 865 * sizeof(Char)); 866 (void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino); 867 xfree(strdev); 868 xfree(strino); 869 cleanup_until(ep); 870 return(strF); 871 872 case 'L': 873 if ( *(ft + 1) ) { 874 i = 1; 875 break; 876 } 877 #ifdef S_ISLNK 878 filnam = short2str(ep); 879 string = areadlink(filnam); 880 strF = string == NULL ? errval : str2short(string); 881 xfree(string); 882 cleanup_until(ep); 883 return(Strsave(strF)); 884 885 #else /* !S_ISLNK */ 886 i = 0; 887 break; 888 #endif /* S_ISLNK */ 889 890 891 case 'N': 892 i = (int) st->st_nlink; 893 break; 894 895 case 'P': 896 string = string0 + 1; 897 (void) xsnprintf(string, sizeof(string0) - 1, "%o", 898 pmask & (unsigned int) 899 ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode)); 900 if (altout && *string != '0') 901 *--string = '0'; 902 cleanup_until(ep); 903 return(Strsave(str2short(string))); 904 905 case 'U': 906 if (altout && (pw = xgetpwuid(st->st_uid))) { 907 cleanup_until(ep); 908 return(Strsave(str2short(pw->pw_name))); 909 } 910 i = (int) st->st_uid; 911 break; 912 913 case 'G': 914 if (altout && (gr = xgetgrgid(st->st_gid))) { 915 cleanup_until(ep); 916 return(Strsave(str2short(gr->gr_name))); 917 } 918 i = (int) st->st_gid; 919 break; 920 921 case 'Z': 922 i = (int) st->st_size; 923 break; 924 925 case 'A': case 'M': case 'C': 926 footime = *ft == 'A' ? st->st_atime : 927 *ft == 'M' ? st->st_mtime : st->st_ctime; 928 if (altout) { 929 strF = str2short(ctime(&footime)); 930 if ((str = Strchr(strF, '\n')) != NULL) 931 *str = (Char) '\0'; 932 cleanup_until(ep); 933 return(Strsave(strF)); 934 } 935 i = (int) footime; 936 break; 937 938 } 939 } 940 while (*++ft && i); 941 etraci("exp6 -? i", i, vp); 942 cleanup_until(ep); 943 return (putn(i)); 944 } 945 946 947 static void 948 evalav(Char **v) 949 { 950 struct wordent paraml1; 951 struct wordent *hp = ¶ml1; 952 struct command *t; 953 struct wordent *wdp = hp; 954 955 setcopy(STRstatus, STR0, VAR_READWRITE); 956 hp->prev = hp->next = hp; 957 hp->word = STRNULL; 958 while (*v) { 959 struct wordent *new = xcalloc(1, sizeof *wdp); 960 961 new->prev = wdp; 962 new->next = hp; 963 wdp->next = new; 964 wdp = new; 965 wdp->word = Strsave(*v++); 966 } 967 hp->prev = wdp; 968 cleanup_push(¶ml1, lex_cleanup); 969 alias(¶ml1); 970 t = syntax(paraml1.next, ¶ml1, 0); 971 cleanup_push(t, syntax_cleanup); 972 if (seterr) 973 stderror(ERR_OLD); 974 execute(t, -1, NULL, NULL, TRUE); 975 cleanup_until(¶ml1); 976 } 977 978 static int 979 isa(Char *cp, int what) 980 { 981 if (cp == 0) 982 return ((what & RESTOP) != 0); 983 if (*cp == '\0') 984 return 0; 985 if (cp[1] == 0) { 986 if (what & ADDOP && (*cp == '+' || *cp == '-')) 987 return (1); 988 if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%')) 989 return (1); 990 if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' || 991 *cp == '~' || *cp == '^' || *cp == '"')) 992 return (1); 993 } 994 else if (cp[2] == 0) { 995 if (what & RESTOP) { 996 if (cp[0] == '|' && cp[1] == '&') 997 return (1); 998 if (cp[0] == '<' && cp[1] == '<') 999 return (1); 1000 if (cp[0] == '>' && cp[1] == '>') 1001 return (1); 1002 } 1003 if (what & EQOP) { 1004 if (cp[0] == '=') { 1005 if (cp[1] == '=') 1006 return (EQEQ); 1007 if (cp[1] == '~') 1008 return (EQMATCH); 1009 } 1010 else if (cp[0] == '!') { 1011 if (cp[1] == '=') 1012 return (NOTEQ); 1013 if (cp[1] == '~') 1014 return (NOTEQMATCH); 1015 } 1016 } 1017 } 1018 if (what & RELOP) { 1019 if (*cp == '<') 1020 return (LSS); 1021 if (*cp == '>') 1022 return (GTR); 1023 } 1024 return (0); 1025 } 1026 1027 static int 1028 egetn(Char *cp) 1029 { 1030 if (*cp && *cp != '-' && !Isdigit(*cp)) 1031 stderror(ERR_NAME | ERR_EXPRESSION); 1032 return (getn(cp)); 1033 } 1034 1035 /* Phew! */ 1036 1037 #ifdef EDEBUG 1038 static void 1039 etraci(const char *str, int i, Char ***vp) 1040 { 1041 xprintf("%s=%d\t", str, i); 1042 blkpr(*vp); 1043 xputchar('\n'); 1044 } 1045 static void 1046 etracc(const char *str, const Char *cp, Char ***vp) 1047 { 1048 xprintf("%s=%S\t", str, cp); 1049 blkpr(*vp); 1050 xputchar('\n'); 1051 } 1052 #endif /* EDEBUG */ 1053