1 /* $NetBSD: c_sh.c,v 1.12 2006/04/01 23:39:58 christos Exp $ */ 2 3 /* 4 * built-in Bourne commands 5 */ 6 #include <sys/cdefs.h> 7 8 #ifndef lint 9 __RCSID("$NetBSD: c_sh.c,v 1.12 2006/04/01 23:39:58 christos Exp $"); 10 #endif 11 12 13 #include "sh.h" 14 #include "ksh_stat.h" /* umask() */ 15 #include "ksh_time.h" 16 #include "ksh_times.h" 17 18 static char *clocktos ARGS((clock_t t)); 19 20 21 /* :, false and true */ 22 int 23 c_label(wp) 24 char **wp; 25 { 26 return wp[0][0] == 'f' ? 1 : 0; 27 } 28 29 int 30 c_shift(wp) 31 char **wp; 32 { 33 register struct block *l = e->loc; 34 register int n; 35 long val; 36 char *arg; 37 38 if (ksh_getopt(wp, &builtin_opt, null) == '?') 39 return 1; 40 arg = wp[builtin_opt.optind]; 41 42 if (arg) { 43 evaluate(arg, &val, KSH_UNWIND_ERROR); 44 n = val; 45 } else 46 n = 1; 47 if (n < 0) { 48 bi_errorf("%s: bad number", arg); 49 return (1); 50 } 51 if (l->argc < n) { 52 bi_errorf("nothing to shift"); 53 return (1); 54 } 55 l->argv[n] = l->argv[0]; 56 l->argv += n; 57 l->argc -= n; 58 return 0; 59 } 60 61 int 62 c_umask(wp) 63 char **wp; 64 { 65 register int i; 66 register char *cp; 67 int symbolic = 0; 68 int old_umask; 69 int optc; 70 71 while ((optc = ksh_getopt(wp, &builtin_opt, "S")) != EOF) 72 switch (optc) { 73 case 'S': 74 symbolic = 1; 75 break; 76 case '?': 77 return 1; 78 } 79 cp = wp[builtin_opt.optind]; 80 if (cp == NULL) { 81 old_umask = umask(0); 82 umask(old_umask); 83 if (symbolic) { 84 char buf[18]; 85 int j; 86 87 old_umask = ~old_umask; 88 cp = buf; 89 for (i = 0; i < 3; i++) { 90 *cp++ = "ugo"[i]; 91 *cp++ = '='; 92 for (j = 0; j < 3; j++) 93 if (old_umask & (1 << (8 - (3*i + j)))) 94 *cp++ = "rwx"[j]; 95 *cp++ = ','; 96 } 97 cp[-1] = '\0'; 98 shprintf("%s\n", buf); 99 } else 100 shprintf("%#3.3o\n", old_umask); 101 } else { 102 int new_umask; 103 104 if (digit(*cp)) { 105 for (new_umask = 0; *cp >= '0' && *cp <= '7'; cp++) 106 new_umask = new_umask * 8 + (*cp - '0'); 107 if (*cp) { 108 bi_errorf("bad number"); 109 return 1; 110 } 111 } else { 112 /* symbolic format */ 113 int positions, new_val; 114 char op; 115 116 old_umask = umask(0); 117 umask(old_umask); /* in case of error */ 118 old_umask = ~old_umask; 119 new_umask = old_umask; 120 positions = 0; 121 while (*cp) { 122 while (*cp && strchr("augo", *cp)) 123 switch (*cp++) { 124 case 'a': positions |= 0111; break; 125 case 'u': positions |= 0100; break; 126 case 'g': positions |= 0010; break; 127 case 'o': positions |= 0001; break; 128 } 129 if (!positions) 130 positions = 0111; /* default is a */ 131 if (!strchr("=+-", op = *cp)) 132 break; 133 cp++; 134 new_val = 0; 135 while (*cp && strchr("rwxugoXs", *cp)) 136 switch (*cp++) { 137 case 'r': new_val |= 04; break; 138 case 'w': new_val |= 02; break; 139 case 'x': new_val |= 01; break; 140 case 'u': new_val |= old_umask >> 6; 141 break; 142 case 'g': new_val |= old_umask >> 3; 143 break; 144 case 'o': new_val |= old_umask >> 0; 145 break; 146 case 'X': if (old_umask & 0111) 147 new_val |= 01; 148 break; 149 case 's': /* ignored */ 150 break; 151 } 152 new_val = (new_val & 07) * positions; 153 switch (op) { 154 case '-': 155 new_umask &= ~new_val; 156 break; 157 case '=': 158 new_umask = new_val 159 | (new_umask & ~(positions * 07)); 160 break; 161 case '+': 162 new_umask |= new_val; 163 } 164 if (*cp == ',') { 165 positions = 0; 166 cp++; 167 } else if (!strchr("=+-", *cp)) 168 break; 169 } 170 if (*cp) { 171 bi_errorf("bad mask"); 172 return 1; 173 } 174 new_umask = ~new_umask; 175 } 176 umask(new_umask); 177 } 178 return 0; 179 } 180 181 int 182 c_dot(wp) 183 char **wp; 184 { 185 char *file, *cp; 186 char **argv; 187 int argc; 188 int i; 189 int err; 190 191 if (ksh_getopt(wp, &builtin_opt, null) == '?') 192 return 1; 193 194 if ((cp = wp[builtin_opt.optind]) == NULL) 195 return 0; 196 file = search(cp, path, R_OK, &err); 197 if (file == NULL) { 198 bi_errorf("%s: %s", cp, err ? strerror(err) : "not found"); 199 return 1; 200 } 201 202 /* Set positional parameters? */ 203 if (wp[builtin_opt.optind + 1]) { 204 argv = wp + builtin_opt.optind; 205 argv[0] = e->loc->argv[0]; /* preserve $0 */ 206 for (argc = 0; argv[argc + 1]; argc++) 207 ; 208 } else { 209 argc = 0; 210 argv = (char **) 0; 211 } 212 i = include(file, argc, argv, 0); 213 if (i < 0) { /* should not happen */ 214 bi_errorf("%s: %s", cp, strerror(errno)); 215 return 1; 216 } 217 return i; 218 } 219 220 int 221 c_wait(wp) 222 char **wp; 223 { 224 int UNINITIALIZED(rv); 225 int sig; 226 227 if (ksh_getopt(wp, &builtin_opt, null) == '?') 228 return 1; 229 wp += builtin_opt.optind; 230 if (*wp == (char *) 0) { 231 while (waitfor((char *) 0, &sig) >= 0) 232 ; 233 rv = sig; 234 } else { 235 for (; *wp; wp++) 236 rv = waitfor(*wp, &sig); 237 if (rv < 0) 238 rv = sig ? sig : 127; /* magic exit code: bad job-id */ 239 } 240 return rv; 241 } 242 243 int 244 c_read(wp) 245 char **wp; 246 { 247 register int c = 0; 248 int expandv = 1, history = 0; 249 int expanding; 250 int ecode = 0; 251 register char *cp; 252 int fd = 0; 253 struct shf *shf; 254 int optc; 255 const char *emsg; 256 XString cs, xs; 257 struct tbl *vp; 258 char UNINITIALIZED(*xp); 259 static char REPLY[] = "REPLY"; 260 261 while ((optc = ksh_getopt(wp, &builtin_opt, "prsu,")) != EOF) 262 switch (optc) { 263 #ifdef KSH 264 case 'p': 265 if ((fd = coproc_getfd(R_OK, &emsg)) < 0) { 266 bi_errorf("-p: %s", emsg); 267 return 1; 268 } 269 break; 270 #endif /* KSH */ 271 case 'r': 272 expandv = 0; 273 break; 274 case 's': 275 history = 1; 276 break; 277 case 'u': 278 if (!*(cp = builtin_opt.optarg)) 279 fd = 0; 280 else if ((fd = check_fd(cp, R_OK, &emsg)) < 0) { 281 bi_errorf("-u: %s: %s", cp, emsg); 282 return 1; 283 } 284 break; 285 case '?': 286 return 1; 287 } 288 wp += builtin_opt.optind; 289 290 if (*wp == NULL) 291 *--wp = REPLY; 292 293 /* Since we can't necessarily seek backwards on non-regular files, 294 * don't buffer them so we can't read too much. 295 */ 296 shf = shf_reopen(fd, SHF_RD | SHF_INTERRUPT | can_seek(fd), shl_spare); 297 298 if ((cp = strchr(*wp, '?')) != NULL) { 299 *cp = 0; 300 if (isatty(fd)) { 301 /* at&t ksh says it prints prompt on fd if it's open 302 * for writing and is a tty, but it doesn't do it 303 * (it also doesn't check the interactive flag, 304 * as is indicated in the Kornshell book). 305 */ 306 shellf("%s", cp+1); 307 } 308 } 309 310 #ifdef KSH 311 /* If we are reading from the co-process for the first time, 312 * make sure the other side of the pipe is closed first. This allows 313 * the detection of eof. 314 * 315 * This is not compatible with at&t ksh... the fd is kept so another 316 * coproc can be started with same output, however, this means eof 317 * can't be detected... This is why it is closed here. 318 * If this call is removed, remove the eof check below, too. 319 * coproc_readw_close(fd); 320 */ 321 #endif /* KSH */ 322 323 if (history) 324 Xinit(xs, xp, 128, ATEMP); 325 expanding = 0; 326 Xinit(cs, cp, 128, ATEMP); 327 for (; *wp != NULL; wp++) { 328 for (cp = Xstring(cs, cp); ; ) { 329 if (c == '\n' || c == EOF) 330 break; 331 while (1) { 332 c = shf_getc(shf); 333 if (c == '\0' 334 #ifdef OS2 335 || c == '\r' 336 #endif /* OS2 */ 337 ) 338 continue; 339 if (c == EOF && shf_error(shf) 340 && shf_errno(shf) == EINTR) 341 { 342 /* Was the offending signal one that 343 * would normally kill a process? 344 * If so, pretend the read was killed. 345 */ 346 ecode = fatal_trap_check(); 347 348 /* non fatal (eg, CHLD), carry on */ 349 if (!ecode) { 350 shf_clearerr(shf); 351 continue; 352 } 353 } 354 break; 355 } 356 if (history) { 357 Xcheck(xs, xp); 358 Xput(xs, xp, c); 359 } 360 Xcheck(cs, cp); 361 if (expanding) { 362 expanding = 0; 363 if (c == '\n') { 364 c = 0; 365 if (Flag(FTALKING_I) && isatty(fd)) { 366 /* set prompt in case this is 367 * called from .profile or $ENV 368 */ 369 set_prompt(PS2, (Source *) 0); 370 pprompt(prompt, 0); 371 } 372 } else if (c != EOF) 373 Xput(cs, cp, c); 374 continue; 375 } 376 if (expandv && c == '\\') { 377 expanding = 1; 378 continue; 379 } 380 if (c == '\n' || c == EOF) 381 break; 382 if (ctype(c, C_IFS)) { 383 if (Xlength(cs, cp) == 0 && ctype(c, C_IFSWS)) 384 continue; 385 if (wp[1]) 386 break; 387 } 388 Xput(cs, cp, c); 389 } 390 /* strip trailing IFS white space from last variable */ 391 if (!wp[1]) 392 while (Xlength(cs, cp) && ctype(cp[-1], C_IFS) 393 && ctype(cp[-1], C_IFSWS)) 394 cp--; 395 Xput(cs, cp, '\0'); 396 vp = global(*wp); 397 /* Must be done before setting export. */ 398 if (vp->flag & RDONLY) { 399 shf_flush(shf); 400 bi_errorf("%s is read only", *wp); 401 return 1; 402 } 403 if (Flag(FEXPORT)) 404 typeset(*wp, EXPORT, 0, 0, 0); 405 if (!setstr(vp, Xstring(cs, cp), KSH_RETURN_ERROR)) { 406 shf_flush(shf); 407 return 1; 408 } 409 } 410 411 shf_flush(shf); 412 if (history) { 413 Xput(xs, xp, '\0'); 414 source->line++; 415 histsave(source->line, Xstring(xs, xp), 1); 416 Xfree(xs, xp); 417 } 418 #ifdef KSH 419 /* if this is the co-process fd, close the file descriptor 420 * (can get eof if and only if all processes are have died, ie, 421 * coproc.njobs is 0 and the pipe is closed). 422 */ 423 if (c == EOF && !ecode) 424 coproc_read_close(fd); 425 #endif /* KSH */ 426 427 return ecode ? ecode : c == EOF; 428 } 429 430 int 431 c_eval(wp) 432 char **wp; 433 { 434 register struct source *s; 435 int rv; 436 437 if (ksh_getopt(wp, &builtin_opt, null) == '?') 438 return 1; 439 s = pushs(SWORDS, ATEMP); 440 s->u.strv = wp + builtin_opt.optind; 441 if (!Flag(FPOSIX)) { 442 /* 443 * Handle case where the command is empty due to failed 444 * command substitution, eg, eval "$(false)". 445 * In this case, shell() will not set/change exstat (because 446 * compiled tree is empty), so will use this value. 447 * subst_exstat is cleared in execute(), so should be 0 if 448 * there were no substitutions. 449 * 450 * A strict reading of POSIX says we don't do this (though 451 * it is traditionally done). [from 1003.2-1992] 452 * 3.9.1: Simple Commands 453 * ... If there is a command name, execution shall 454 * continue as described in 3.9.1.1. If there 455 * is no command name, but the command contained a command 456 * substitution, the command shall complete with the exit 457 * status of the last command substitution 458 * 3.9.1.1: Command Search and Execution 459 * ...(1)...(a) If the command name matches the name of 460 * a special built-in utility, that special built-in 461 * utility shall be invoked. 462 * 3.14.5: Eval 463 * ... If there are no arguments, or only null arguments, 464 * eval shall return an exit status of zero. 465 */ 466 exstat = subst_exstat; 467 } 468 469 rv = shell(s, FALSE); 470 afree(s, ATEMP); 471 return rv; 472 } 473 474 int 475 c_trap(wp) 476 char **wp; 477 { 478 int i; 479 char *s; 480 register Trap *p; 481 482 if (ksh_getopt(wp, &builtin_opt, null) == '?') 483 return 1; 484 wp += builtin_opt.optind; 485 486 if (*wp == NULL) { 487 int anydfl = 0; 488 489 for (p = sigtraps, i = SIGNALS+1; --i >= 0; p++) { 490 if (p->trap == NULL) 491 anydfl = 1; 492 else { 493 shprintf("trap -- "); 494 print_value_quoted(p->trap); 495 shprintf(" %s\n", p->name); 496 } 497 } 498 #if 0 /* this is ugly and not clear POSIX needs it */ 499 /* POSIX may need this so output of trap can be saved and 500 * used to restore trap conditions 501 */ 502 if (anydfl) { 503 shprintf("trap -- -"); 504 for (p = sigtraps, i = SIGNALS+1; --i >= 0; p++) 505 if (p->trap == NULL && p->name) 506 shprintf(" %s", p->name); 507 shprintf(newline); 508 } 509 #endif 510 return 0; 511 } 512 513 /* 514 * Use case sensitive lookup for first arg so the 515 * command 'exit' isn't confused with the pseudo-signal 516 * 'EXIT'. 517 */ 518 s = (gettrap(*wp, FALSE) == NULL) ? *wp++ : NULL; /* get command */ 519 if (s != NULL && s[0] == '-' && s[1] == '\0') 520 s = NULL; 521 522 /* set/clear traps */ 523 while (*wp != NULL) { 524 p = gettrap(*wp++, TRUE); 525 if (p == NULL) { 526 bi_errorf("bad signal %s", wp[-1]); 527 return 1; 528 } 529 settrap(p, s); 530 } 531 return 0; 532 } 533 534 int 535 c_exitreturn(wp) 536 char **wp; 537 { 538 int how = LEXIT; 539 int n; 540 char *arg; 541 542 if (ksh_getopt(wp, &builtin_opt, null) == '?') 543 return 1; 544 arg = wp[builtin_opt.optind]; 545 546 if (arg) { 547 if (!getn(arg, &n)) { 548 exstat = 1; 549 warningf(TRUE, "%s: bad number", arg); 550 } else 551 exstat = n; 552 } 553 if (wp[0][0] == 'r') { /* return */ 554 struct env *ep; 555 556 /* need to tell if this is exit or return so trap exit will 557 * work right (POSIX) 558 */ 559 for (ep = e; ep; ep = ep->oenv) 560 if (STOP_RETURN(ep->type)) { 561 how = LRETURN; 562 break; 563 } 564 } 565 566 if (how == LEXIT && !really_exit && j_stopped_running()) { 567 really_exit = 1; 568 how = LSHELL; 569 } 570 571 quitenv(); /* get rid of any i/o redirections */ 572 unwind(how); 573 /*NOTREACHED*/ 574 return 0; 575 } 576 577 int 578 c_brkcont(wp) 579 char **wp; 580 { 581 int n, quit; 582 struct env *ep, *last_ep = (struct env *) 0; 583 char *arg; 584 585 if (ksh_getopt(wp, &builtin_opt, null) == '?') 586 return 1; 587 arg = wp[builtin_opt.optind]; 588 589 if (!arg) 590 n = 1; 591 else if (!bi_getn(arg, &n)) 592 return 1; 593 quit = n; 594 if (quit <= 0) { 595 /* at&t ksh does this for non-interactive shells only - weird */ 596 bi_errorf("%s: bad value", arg); 597 return 1; 598 } 599 600 /* Stop at E_NONE, E_PARSE, E_FUNC, or E_INCL */ 601 for (ep = e; ep && !STOP_BRKCONT(ep->type); ep = ep->oenv) 602 if (ep->type == E_LOOP) { 603 if (--quit == 0) 604 break; 605 ep->flags |= EF_BRKCONT_PASS; 606 last_ep = ep; 607 } 608 609 if (quit) { 610 /* at&t ksh doesn't print a message - just does what it 611 * can. We print a message 'cause it helps in debugging 612 * scripts, but don't generate an error (ie, keep going). 613 */ 614 if (n == quit) { 615 warningf(TRUE, "%s: cannot %s", wp[0], wp[0]); 616 return 0; 617 } 618 /* POSIX says if n is too big, the last enclosing loop 619 * shall be used. Doesn't say to print an error but we 620 * do anyway 'cause the user messed up. 621 */ 622 if (last_ep) 623 last_ep->flags &= ~EF_BRKCONT_PASS; 624 warningf(TRUE, "%s: can only %s %d level(s)", 625 wp[0], wp[0], n - quit); 626 } 627 628 unwind(*wp[0] == 'b' ? LBREAK : LCONTIN); 629 /*NOTREACHED*/ 630 } 631 632 int 633 c_set(wp) 634 char **wp; 635 { 636 int argi, setargs; 637 struct block *l = e->loc; 638 register char **owp = wp; 639 640 if (wp[1] == NULL) { 641 static const char *const args [] = { "set", "-", NULL }; 642 return c_typeset((char **)__UNCONST(args)); 643 } 644 645 argi = parse_args(wp, OF_SET, &setargs); 646 if (argi < 0) 647 return 1; 648 /* set $# and $* */ 649 if (setargs) { 650 owp = wp += argi - 1; 651 wp[0] = l->argv[0]; /* save $0 */ 652 while (*++wp != NULL) 653 *wp = str_save(*wp, &l->area); 654 l->argc = wp - owp - 1; 655 l->argv = (char **) alloc(sizeofN(char *, l->argc+2), &l->area); 656 for (wp = l->argv; (*wp++ = *owp++) != NULL; ) 657 ; 658 } 659 /* POSIX says set exit status is 0, but old scripts that use 660 * getopt(1), use the construct: set -- `getopt ab:c "$@"` 661 * which assumes the exit value set will be that of the `` 662 * (subst_exstat is cleared in execute() so that it will be 0 663 * if there are no command substitutions). 664 */ 665 return Flag(FPOSIX) ? 0 : subst_exstat; 666 } 667 668 int 669 c_unset(wp) 670 char **wp; 671 { 672 register char *id; 673 int optc, unset_var = 1; 674 int ret = 0; 675 676 while ((optc = ksh_getopt(wp, &builtin_opt, "fv")) != EOF) 677 switch (optc) { 678 case 'f': 679 unset_var = 0; 680 break; 681 case 'v': 682 unset_var = 1; 683 break; 684 case '?': 685 return 1; 686 } 687 wp += builtin_opt.optind; 688 for (; (id = *wp) != NULL; wp++) 689 if (unset_var) { /* unset variable */ 690 struct tbl *vp = global(id); 691 692 if (!(vp->flag & ISSET)) 693 ret = 1; 694 if ((vp->flag&RDONLY)) { 695 bi_errorf("%s is read only", vp->name); 696 return 1; 697 } 698 unset(vp, strchr(id, '[') ? 1 : 0); 699 } else { /* unset function */ 700 if (define(id, (struct op *) NULL)) 701 ret = 1; 702 } 703 return ret; 704 } 705 706 int 707 c_times(wp) 708 char **wp; 709 { 710 struct tms all; 711 712 (void) ksh_times(&all); 713 shprintf("Shell: %8ss user ", clocktos(all.tms_utime)); 714 shprintf("%8ss system\n", clocktos(all.tms_stime)); 715 shprintf("Kids: %8ss user ", clocktos(all.tms_cutime)); 716 shprintf("%8ss system\n", clocktos(all.tms_cstime)); 717 718 return 0; 719 } 720 721 /* 722 * time pipeline (really a statement, not a built-in command) 723 */ 724 int 725 timex(t, f) 726 struct op *t; 727 int f; 728 { 729 #define TF_NOARGS BIT(0) 730 #define TF_NOREAL BIT(1) /* don't report real time */ 731 #define TF_POSIX BIT(2) /* report in posix format */ 732 int rv = 0; 733 struct tms t0, t1, tms; 734 clock_t t0t, t1t = 0; 735 int tf = 0; 736 extern clock_t j_usrtime, j_systime; /* computed by j_wait */ 737 char opts[1]; 738 739 t0t = ksh_times(&t0); 740 if (t->left) { 741 /* 742 * Two ways of getting cpu usage of a command: just use t0 743 * and t1 (which will get cpu usage from other jobs that 744 * finish while we are executing t->left), or get the 745 * cpu usage of t->left. at&t ksh does the former, while 746 * pdksh tries to do the later (the j_usrtime hack doesn't 747 * really work as it only counts the last job). 748 */ 749 j_usrtime = j_systime = 0; 750 if (t->left->type == TCOM) 751 t->left->str = opts; 752 opts[0] = 0; 753 rv = execute(t->left, f | XTIME); 754 tf |= opts[0]; 755 t1t = ksh_times(&t1); 756 } else 757 tf = TF_NOARGS; 758 759 if (tf & TF_NOARGS) { /* ksh93 - report shell times (shell+kids) */ 760 tf |= TF_NOREAL; 761 tms.tms_utime = t0.tms_utime + t0.tms_cutime; 762 tms.tms_stime = t0.tms_stime + t0.tms_cstime; 763 } else { 764 tms.tms_utime = t1.tms_utime - t0.tms_utime + j_usrtime; 765 tms.tms_stime = t1.tms_stime - t0.tms_stime + j_systime; 766 } 767 768 if (!(tf & TF_NOREAL)) 769 shf_fprintf(shl_out, 770 tf & TF_POSIX ? "real %8s\n" : "%8ss real ", 771 clocktos(t1t - t0t)); 772 shf_fprintf(shl_out, tf & TF_POSIX ? "user %8s\n" : "%8ss user ", 773 clocktos(tms.tms_utime)); 774 shf_fprintf(shl_out, tf & TF_POSIX ? "sys %8s\n" : "%8ss system\n", 775 clocktos(tms.tms_stime)); 776 shf_flush(shl_out); 777 778 return rv; 779 } 780 781 void 782 timex_hook(t, app) 783 struct op *t; 784 char ** volatile *app; 785 { 786 char **wp = *app; 787 int optc; 788 int i, j; 789 Getopt opt; 790 791 ksh_getopt_reset(&opt, 0); 792 opt.optind = 0; /* start at the start */ 793 while ((optc = ksh_getopt(wp, &opt, ":p")) != EOF) 794 switch (optc) { 795 case 'p': 796 t->str[0] |= TF_POSIX; 797 break; 798 case '?': 799 errorf("time: -%s unknown option", opt.optarg); 800 case ':': 801 errorf("time: -%s requires an argument", 802 opt.optarg); 803 } 804 /* Copy command words down over options. */ 805 if (opt.optind != 0) { 806 for (i = 0; i < opt.optind; i++) 807 afree(wp[i], ATEMP); 808 for (i = 0, j = opt.optind; (wp[i] = wp[j]); i++, j++) 809 ; 810 } 811 if (!wp[0]) 812 t->str[0] |= TF_NOARGS; 813 *app = wp; 814 } 815 816 static char * 817 clocktos(t) 818 clock_t t; 819 { 820 static char temp[22]; /* enough for 64 bit clock_t */ 821 register int i; 822 register char *cp = temp + sizeof(temp); 823 824 /* note: posix says must use max precision, ie, if clk_tck is 825 * 1000, must print 3 places after decimal (if non-zero, else 1). 826 */ 827 if (CLK_TCK != 100) /* convert to 1/100'ths */ 828 t = (t < 1000000000/CLK_TCK) ? 829 (t * 100) / CLK_TCK : (t / CLK_TCK) * 100; 830 831 *--cp = '\0'; 832 for (i = -2; i <= 0 || t > 0; i++) { 833 if (i == 0) 834 *--cp = '.'; 835 *--cp = '0' + (char)(t%10); 836 t /= 10; 837 } 838 return cp; 839 } 840 841 /* exec with no args - args case is taken care of in comexec() */ 842 int 843 c_exec(wp) 844 char ** wp; 845 { 846 int i; 847 848 /* make sure redirects stay in place */ 849 if (e->savefd != NULL) { 850 for (i = 0; i < NUFILE; i++) { 851 if (e->savefd[i] > 0) 852 close(e->savefd[i]); 853 /* 854 * For ksh keep anything > 2 private, 855 * for sh, let them be (POSIX says what 856 * happens is unspecified and the bourne shell 857 * keeps them open). 858 */ 859 #ifdef KSH 860 if (i > 2 && e->savefd[i]) 861 fd_clexec(i); 862 #endif /* KSH */ 863 } 864 e->savefd = NULL; 865 } 866 return 0; 867 } 868 869 /* dummy function, special case in comexec() */ 870 int 871 c_builtin(wp) 872 char ** wp; 873 { 874 return 0; 875 } 876 877 extern int c_test ARGS((char **wp)); /* in c_test.c */ 878 extern int c_ulimit ARGS((char **wp)); /* in c_ulimit.c */ 879 880 /* A leading = means assignments before command are kept; 881 * a leading * means a POSIX special builtin; 882 * a leading + means a POSIX regular builtin 883 * (* and + should not be combined). 884 */ 885 const struct builtin shbuiltins [] = { 886 {"*=.", c_dot}, 887 {"*=:", c_label}, 888 {"[", c_test}, 889 {"*=break", c_brkcont}, 890 {"=builtin", c_builtin}, 891 {"*=continue", c_brkcont}, 892 {"*=eval", c_eval}, 893 {"*=exec", c_exec}, 894 {"*=exit", c_exitreturn}, 895 {"+false", c_label}, 896 {"*=return", c_exitreturn}, 897 {"*=set", c_set}, 898 {"*=shift", c_shift}, 899 {"=times", c_times}, 900 {"*=trap", c_trap}, 901 {"+=wait", c_wait}, 902 {"+read", c_read}, 903 {"test", c_test}, 904 {"+true", c_label}, 905 {"ulimit", c_ulimit}, 906 {"+umask", c_umask}, 907 {"*=unset", c_unset}, 908 #ifdef OS2 909 /* In OS2, the first line of a file can be "extproc name", which 910 * tells the command interpreter (cmd.exe) to use name to execute 911 * the file. For this to be useful, ksh must ignore commands 912 * starting with extproc and this does the trick... 913 */ 914 {"extproc", c_label}, 915 #endif /* OS2 */ 916 {NULL, NULL} 917 }; 918