1 /* $NetBSD: c_sh.c,v 1.15 2013/10/18 19:53:34 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 1.15 2013/10/18 19:53:34 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 #else 510 __USE(anydfl); 511 #endif 512 return 0; 513 } 514 515 /* 516 * Use case sensitive lookup for first arg so the 517 * command 'exit' isn't confused with the pseudo-signal 518 * 'EXIT'. 519 */ 520 s = (gettrap(*wp, FALSE) == NULL) ? *wp++ : NULL; /* get command */ 521 if (s != NULL && s[0] == '-' && s[1] == '\0') 522 s = NULL; 523 524 /* set/clear traps */ 525 while (*wp != NULL) { 526 p = gettrap(*wp++, TRUE); 527 if (p == NULL) { 528 bi_errorf("bad signal %s", wp[-1]); 529 return 1; 530 } 531 settrap(p, s); 532 } 533 return 0; 534 } 535 536 int 537 c_exitreturn(wp) 538 char **wp; 539 { 540 int how = LEXIT; 541 int n; 542 char *arg; 543 544 if (ksh_getopt(wp, &builtin_opt, null) == '?') 545 return 1; 546 arg = wp[builtin_opt.optind]; 547 548 if (arg) { 549 if (!getn(arg, &n)) { 550 exstat = 1; 551 warningf(TRUE, "%s: bad number", arg); 552 } else 553 exstat = n; 554 } 555 if (wp[0][0] == 'r') { /* return */ 556 struct env *ep; 557 558 /* need to tell if this is exit or return so trap exit will 559 * work right (POSIX) 560 */ 561 for (ep = e; ep; ep = ep->oenv) 562 if (STOP_RETURN(ep->type)) { 563 how = LRETURN; 564 break; 565 } 566 } 567 568 if (how == LEXIT && !really_exit && j_stopped_running()) { 569 really_exit = 1; 570 how = LSHELL; 571 } 572 573 quitenv(); /* get rid of any i/o redirections */ 574 unwind(how); 575 /*NOTREACHED*/ 576 return 0; 577 } 578 579 int 580 c_brkcont(wp) 581 char **wp; 582 { 583 int n, quit; 584 struct env *ep, *last_ep = (struct env *) 0; 585 char *arg; 586 587 if (ksh_getopt(wp, &builtin_opt, null) == '?') 588 return 1; 589 arg = wp[builtin_opt.optind]; 590 591 if (!arg) 592 n = 1; 593 else if (!bi_getn(arg, &n)) 594 return 1; 595 quit = n; 596 if (quit <= 0) { 597 /* at&t ksh does this for non-interactive shells only - weird */ 598 bi_errorf("%s: bad value", arg); 599 return 1; 600 } 601 602 /* Stop at E_NONE, E_PARSE, E_FUNC, or E_INCL */ 603 for (ep = e; ep && !STOP_BRKCONT(ep->type); ep = ep->oenv) 604 if (ep->type == E_LOOP) { 605 if (--quit == 0) 606 break; 607 ep->flags |= EF_BRKCONT_PASS; 608 last_ep = ep; 609 } 610 611 if (quit) { 612 /* at&t ksh doesn't print a message - just does what it 613 * can. We print a message 'cause it helps in debugging 614 * scripts, but don't generate an error (ie, keep going). 615 */ 616 if (n == quit) { 617 warningf(TRUE, "%s: cannot %s", wp[0], wp[0]); 618 return 0; 619 } 620 /* POSIX says if n is too big, the last enclosing loop 621 * shall be used. Doesn't say to print an error but we 622 * do anyway 'cause the user messed up. 623 */ 624 if (last_ep) 625 last_ep->flags &= ~EF_BRKCONT_PASS; 626 warningf(TRUE, "%s: can only %s %d level(s)", 627 wp[0], wp[0], n - quit); 628 } 629 630 unwind(*wp[0] == 'b' ? LBREAK : LCONTIN); 631 /*NOTREACHED*/ 632 } 633 634 int 635 c_set(wp) 636 char **wp; 637 { 638 int argi, setargs; 639 struct block *l = e->loc; 640 register char **owp = wp; 641 642 if (wp[1] == NULL) { 643 static const char *const args [] = { "set", "-", NULL }; 644 return c_typeset((char **)__UNCONST(args)); 645 } 646 647 argi = parse_args(wp, OF_SET, &setargs); 648 if (argi < 0) 649 return 1; 650 /* set $# and $* */ 651 if (setargs) { 652 owp = wp += argi - 1; 653 wp[0] = l->argv[0]; /* save $0 */ 654 while (*++wp != NULL) 655 *wp = str_save(*wp, &l->area); 656 l->argc = wp - owp - 1; 657 l->argv = (char **) alloc(sizeofN(char *, l->argc+2), &l->area); 658 for (wp = l->argv; (*wp++ = *owp++) != NULL; ) 659 ; 660 } 661 /* POSIX says set exit status is 0, but old scripts that use 662 * getopt(1), use the construct: set -- `getopt ab:c "$@"` 663 * which assumes the exit value set will be that of the `` 664 * (subst_exstat is cleared in execute() so that it will be 0 665 * if there are no command substitutions). 666 */ 667 return Flag(FPOSIX) ? 0 : subst_exstat; 668 } 669 670 int 671 c_unset(wp) 672 char **wp; 673 { 674 register char *id; 675 int optc, unset_var = 1; 676 int ret = 0; 677 678 while ((optc = ksh_getopt(wp, &builtin_opt, "fv")) != EOF) 679 switch (optc) { 680 case 'f': 681 unset_var = 0; 682 break; 683 case 'v': 684 unset_var = 1; 685 break; 686 case '?': 687 return 1; 688 } 689 wp += builtin_opt.optind; 690 for (; (id = *wp) != NULL; wp++) 691 if (unset_var) { /* unset variable */ 692 struct tbl *vp = global(id); 693 694 if (!(vp->flag & ISSET)) 695 ret = 1; 696 if ((vp->flag&RDONLY)) { 697 bi_errorf("%s is read only", vp->name); 698 return 1; 699 } 700 unset(vp, strchr(id, '[') ? 1 : 0); 701 } else { /* unset function */ 702 if (define(id, NULL)) 703 ret = 1; 704 } 705 return ret; 706 } 707 708 int 709 c_times(wp) 710 char **wp; 711 { 712 struct tms all; 713 714 (void) ksh_times(&all); 715 shprintf("Shell: %8ss user ", clocktos(all.tms_utime)); 716 shprintf("%8ss system\n", clocktos(all.tms_stime)); 717 shprintf("Kids: %8ss user ", clocktos(all.tms_cutime)); 718 shprintf("%8ss system\n", clocktos(all.tms_cstime)); 719 720 return 0; 721 } 722 723 /* 724 * time pipeline (really a statement, not a built-in command) 725 */ 726 int 727 timex(t, f) 728 struct op *t; 729 int f; 730 { 731 #define TF_NOARGS BIT(0) 732 #define TF_NOREAL BIT(1) /* don't report real time */ 733 #define TF_POSIX BIT(2) /* report in posix format */ 734 int rv = 0; 735 struct tms t0, t1, tms; 736 clock_t t0t, t1t = 0; 737 int tf = 0; 738 extern clock_t j_usrtime, j_systime; /* computed by j_wait */ 739 char opts[1]; 740 741 t0t = ksh_times(&t0); 742 if (t->left) { 743 /* 744 * Two ways of getting cpu usage of a command: just use t0 745 * and t1 (which will get cpu usage from other jobs that 746 * finish while we are executing t->left), or get the 747 * cpu usage of t->left. at&t ksh does the former, while 748 * pdksh tries to do the later (the j_usrtime hack doesn't 749 * really work as it only counts the last job). 750 */ 751 j_usrtime = j_systime = 0; 752 if (t->left->type == TCOM) 753 t->left->str = opts; 754 opts[0] = 0; 755 rv = execute(t->left, f | XTIME); 756 tf |= opts[0]; 757 t1t = ksh_times(&t1); 758 } else 759 tf = TF_NOARGS; 760 761 if (tf & TF_NOARGS) { /* ksh93 - report shell times (shell+kids) */ 762 tf |= TF_NOREAL; 763 tms.tms_utime = t0.tms_utime + t0.tms_cutime; 764 tms.tms_stime = t0.tms_stime + t0.tms_cstime; 765 } else { 766 tms.tms_utime = t1.tms_utime - t0.tms_utime + j_usrtime; 767 tms.tms_stime = t1.tms_stime - t0.tms_stime + j_systime; 768 } 769 770 if (!(tf & TF_NOREAL)) 771 shf_fprintf(shl_out, 772 tf & TF_POSIX ? "real %8s\n" : "%8ss real ", 773 clocktos(t1t - t0t)); 774 shf_fprintf(shl_out, tf & TF_POSIX ? "user %8s\n" : "%8ss user ", 775 clocktos(tms.tms_utime)); 776 shf_fprintf(shl_out, tf & TF_POSIX ? "sys %8s\n" : "%8ss system\n", 777 clocktos(tms.tms_stime)); 778 shf_flush(shl_out); 779 780 return rv; 781 } 782 783 void 784 timex_hook(t, app) 785 struct op *t; 786 char ** volatile *app; 787 { 788 char **wp = *app; 789 int optc; 790 int i, j; 791 Getopt opt; 792 793 ksh_getopt_reset(&opt, 0); 794 opt.optind = 0; /* start at the start */ 795 while ((optc = ksh_getopt(wp, &opt, ":p")) != EOF) 796 switch (optc) { 797 case 'p': 798 t->str[0] |= TF_POSIX; 799 break; 800 case '?': 801 errorf("time: -%s unknown option", opt.optarg); 802 case ':': 803 errorf("time: -%s requires an argument", 804 opt.optarg); 805 } 806 /* Copy command words down over options. */ 807 if (opt.optind != 0) { 808 for (i = 0; i < opt.optind; i++) 809 afree(wp[i], ATEMP); 810 for (i = 0, j = opt.optind; (wp[i] = wp[j]); i++, j++) 811 ; 812 } 813 if (!wp[0]) 814 t->str[0] |= TF_NOARGS; 815 *app = wp; 816 } 817 818 static char * 819 clocktos(t) 820 clock_t t; 821 { 822 static char temp[22]; /* enough for 64 bit clock_t */ 823 register int i; 824 register char *cp = temp + sizeof(temp); 825 826 /* note: posix says must use max precision, ie, if clk_tck is 827 * 1000, must print 3 places after decimal (if non-zero, else 1). 828 */ 829 if (CLK_TCK != 100) /* convert to 1/100'ths */ 830 t = (t < (clock_t)(1000000000/CLK_TCK)) ? 831 (t * 100) / CLK_TCK : (t / CLK_TCK) * 100; 832 833 *--cp = '\0'; 834 for (i = -2; i <= 0 || t > 0; i++) { 835 if (i == 0) 836 *--cp = '.'; 837 *--cp = '0' + (char)(t%10); 838 t /= 10; 839 } 840 return cp; 841 } 842 843 /* exec with no args - args case is taken care of in comexec() */ 844 int 845 c_exec(wp) 846 char ** wp; 847 { 848 int i; 849 850 /* make sure redirects stay in place */ 851 if (e->savefd != NULL) { 852 for (i = 0; i < NUFILE; i++) { 853 if (e->savefd[i] > 0) 854 close(e->savefd[i]); 855 /* 856 * For ksh keep anything > 2 private, 857 * for sh, let them be (POSIX says what 858 * happens is unspecified and the bourne shell 859 * keeps them open). 860 */ 861 #ifdef KSH 862 if (i > 2 && e->savefd[i]) 863 fd_clexec(i); 864 #endif /* KSH */ 865 } 866 e->savefd = NULL; 867 } 868 return 0; 869 } 870 871 /* dummy function, special case in comexec() */ 872 int 873 c_builtin(wp) 874 char ** wp; 875 { 876 return 0; 877 } 878 879 extern int c_test ARGS((char **wp)); /* in c_test.c */ 880 extern int c_ulimit ARGS((char **wp)); /* in c_ulimit.c */ 881 882 /* A leading = means assignments before command are kept; 883 * a leading * means a POSIX special builtin; 884 * a leading + means a POSIX regular builtin 885 * (* and + should not be combined). 886 */ 887 const struct builtin shbuiltins [] = { 888 {"*=.", c_dot}, 889 {"*=:", c_label}, 890 {"[", c_test}, 891 {"*=break", c_brkcont}, 892 {"=builtin", c_builtin}, 893 {"*=continue", c_brkcont}, 894 {"*=eval", c_eval}, 895 {"*=exec", c_exec}, 896 {"*=exit", c_exitreturn}, 897 {"+false", c_label}, 898 {"*=return", c_exitreturn}, 899 {"*=set", c_set}, 900 {"*=shift", c_shift}, 901 {"=times", c_times}, 902 {"*=trap", c_trap}, 903 {"+=wait", c_wait}, 904 {"+read", c_read}, 905 {"test", c_test}, 906 {"+true", c_label}, 907 {"ulimit", c_ulimit}, 908 {"+umask", c_umask}, 909 {"*=unset", c_unset}, 910 #ifdef OS2 911 /* In OS2, the first line of a file can be "extproc name", which 912 * tells the command interpreter (cmd.exe) to use name to execute 913 * the file. For this to be useful, ksh must ignore commands 914 * starting with extproc and this does the trick... 915 */ 916 {"extproc", c_label}, 917 #endif /* OS2 */ 918 {NULL, NULL} 919 }; 920