1 /* $NetBSD: exec.c,v 1.2 1997/01/12 19:11:49 tls Exp $ */ 2 3 /* 4 * execute command tree 5 */ 6 7 #include "sh.h" 8 #include "c_test.h" 9 #include <ctype.h> 10 #include "ksh_stat.h" 11 12 /* Does ps4 get parameter substitutions done? */ 13 #ifdef KSH 14 # define PS4_SUBSTITUTE(s) substitute((s), 0) 15 #else 16 # define PS4_SUBSTITUTE(s) (s) 17 #endif /* KSH */ 18 19 static int comexec ARGS((struct op *t, struct tbl *volatile tp, char **ap, 20 int volatile flags)); 21 static void scriptexec ARGS((struct op *tp, char **ap)); 22 static int call_builtin ARGS((struct tbl *tp, char **wp)); 23 static int iosetup ARGS((struct ioword *iop, struct tbl *tp)); 24 static int herein ARGS((char *hname, int sub)); 25 #ifdef KSH 26 static char *do_selectargs ARGS((char **ap, bool_t print_menu)); 27 #endif /* KSH */ 28 #ifdef KSH 29 static int dbteste_isa ARGS((Test_env *te, Test_meta meta)); 30 static const char *dbteste_getopnd ARGS((Test_env *te, Test_op op, 31 int do_eval)); 32 static int dbteste_eval ARGS((Test_env *te, Test_op op, const char *opnd1, 33 const char *opnd2, int do_eval)); 34 static void dbteste_error ARGS((Test_env *te, int offset, const char *msg)); 35 #endif /* KSH */ 36 #ifdef OS2 37 static int search_access1 ARGS((const char *path, int mode, int *errnop)); 38 #endif /* OS2 */ 39 40 41 /* 42 * handle systems that don't have F_SETFD 43 */ 44 #ifndef F_SETFD 45 # ifndef MAXFD 46 # define MAXFD 64 47 # endif 48 /* a bit field would be smaller, but this will work */ 49 static char clexec_tab[MAXFD+1]; 50 #endif 51 52 /* 53 * we now use this function always. 54 */ 55 int 56 fd_clexec(fd) 57 int fd; 58 { 59 #ifndef F_SETFD 60 if (fd >= 0 && fd < sizeof(clexec_tab)) { 61 clexec_tab[fd] = 1; 62 return 0; 63 } 64 return -1; 65 #else 66 return fcntl(fd, F_SETFD, 1); 67 #endif 68 } 69 70 71 /* 72 * execute command tree 73 */ 74 int 75 execute(t, flags) 76 struct op * volatile t; 77 volatile int flags; /* if XEXEC don't fork */ 78 { 79 int i; 80 volatile int rv = 0; 81 int pv[2]; 82 char ** volatile ap; 83 char *s, *cp; 84 struct ioword **iowp; 85 struct tbl *tp = NULL; 86 87 if (t == NULL) 88 return 0; 89 90 /* Is this the end of a pipeline? If so, we want to evaluate the 91 * command arguments 92 bool_t eval_done = FALSE; 93 if ((flags&XFORK) && !(flags&XEXEC) && (flags&XPCLOSE)) { 94 eval_done = TRUE; 95 tp = eval_execute_args(t, &ap); 96 } 97 */ 98 if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE) 99 return exchild(t, flags, -1); /* run in sub-process */ 100 101 newenv(E_EXEC); 102 if (trap) 103 runtraps(0); 104 105 if (t->type == TCOM) { 106 /* Clear subst_exstat before argument expansion. Used by 107 * null commands (see comexec()) and by c_set(). 108 */ 109 subst_exstat = 0; 110 111 /* POSIX says expand command words first, then redirections, 112 * and assignments last.. 113 */ 114 ap = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE); 115 if (Flag(FXTRACE) && ap[0]) { 116 shf_fprintf(shl_out, "%s", 117 PS4_SUBSTITUTE(str_val(global("PS4")))); 118 for (i = 0; ap[i]; i++) 119 shf_fprintf(shl_out, "%s%s", ap[i], 120 ap[i + 1] ? space : newline); 121 shf_flush(shl_out); 122 } 123 if (ap[0]) 124 tp = findcom(ap[0], FC_BI|FC_FUNC); 125 } 126 127 if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) { 128 e->savefd = (short *) alloc(sizeofN(short, NUFILE), ATEMP); 129 /* initialize to not redirected */ 130 memset(e->savefd, 0, sizeofN(short, NUFILE)); 131 } 132 133 /* do redirection, to be restored in quitenv() */ 134 if (t->ioact != NULL) 135 for (iowp = t->ioact; *iowp != NULL; iowp++) { 136 if (iosetup(*iowp, tp) < 0) { 137 exstat = rv = 1; 138 /* Redirection failures for special commands 139 * cause (non-interactive) shell to exit. 140 */ 141 if (tp && tp->type == CSHELL 142 && (tp->flag & SPEC_BI)) 143 errorf(null); 144 /* Deal with FERREXIT, quitenv(), etc. */ 145 goto Break; 146 } 147 } 148 149 switch(t->type) { 150 case TCOM: 151 rv = comexec(t, tp, ap, flags); 152 break; 153 154 case TPAREN: 155 rv = execute(t->left, flags|XFORK); 156 break; 157 158 case TPIPE: 159 flags |= XFORK; 160 flags &= ~XEXEC; 161 e->savefd[0] = savefd(0, 0); 162 (void) ksh_dup2(e->savefd[0], 0, FALSE); /* stdin of first */ 163 e->savefd[1] = savefd(1, 0); 164 while (t->type == TPIPE) { 165 openpipe(pv); 166 (void) ksh_dup2(pv[1], 1, FALSE); /* stdout of curr */ 167 /* Let exchild() close pv[0] in child 168 * (if this isn't done, commands like 169 * (: ; cat /etc/termcap) | sleep 1 170 * will hang forever). 171 */ 172 exchild(t->left, flags|XPIPEO|XCCLOSE, pv[0]); 173 (void) ksh_dup2(pv[0], 0, FALSE); /* stdin of next */ 174 closepipe(pv); 175 flags |= XPIPEI; 176 t = t->right; 177 } 178 restfd(1, e->savefd[1]); /* stdout of last */ 179 e->savefd[1] = 0; /* no need to re-restore this */ 180 /* Let exchild() close 0 in parent, after fork, before wait */ 181 i = exchild(t, flags|XPCLOSE, 0); 182 if (!(flags&XBGND) && !(flags&XXCOM)) 183 rv = i; 184 break; 185 186 case TLIST: 187 while (t->type == TLIST) { 188 execute(t->left, flags & XERROK); 189 t = t->right; 190 } 191 rv = execute(t, flags & XERROK); 192 break; 193 194 #ifdef KSH 195 case TCOPROC: 196 { 197 # ifdef JOB_SIGS 198 sigset_t omask; 199 # endif /* JOB_SIGS */ 200 201 # ifdef JOB_SIGS 202 /* Block sigchild as we are using things changed in the 203 * signal handler 204 */ 205 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 206 e->type = E_ERRH; 207 i = ksh_sigsetjmp(e->jbuf, 0); 208 if (i) { 209 sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); 210 quitenv(); 211 unwind(i); 212 /*NOTREACHED*/ 213 } 214 # endif /* JOB_SIGS */ 215 /* Already have a (live) co-process? */ 216 if (coproc.job && coproc.write >= 0) 217 errorf("coprocess already exists"); 218 219 /* Can we re-use the existing co-process pipe? */ 220 coproc_cleanup(TRUE); 221 222 /* do this before opening pipes, in case these fail */ 223 e->savefd[0] = savefd(0, 0); 224 e->savefd[1] = savefd(1, 0); 225 226 openpipe(pv); 227 ksh_dup2(pv[0], 0, FALSE); 228 close(pv[0]); 229 coproc.write = pv[1]; 230 coproc.job = (void *) 0; 231 232 if (coproc.readw >= 0) 233 ksh_dup2(coproc.readw, 1, FALSE); 234 else { 235 openpipe(pv); 236 coproc.read = pv[0]; 237 ksh_dup2(pv[1], 1, FALSE); 238 coproc.readw = pv[1]; /* closed before first read */ 239 coproc.njobs = 0; 240 /* create new coprocess id */ 241 ++coproc.id; 242 } 243 # ifdef JOB_SIGS 244 sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); 245 e->type = E_EXEC; /* no more need for error handler */ 246 # endif /* JOB_SIGS */ 247 248 /* exchild() closes coproc.* in child after fork, 249 * will also increment coproc.njobs when the 250 * job is actually created. 251 */ 252 flags &= ~XEXEC; 253 exchild(t->left, flags|XBGND|XFORK|XCOPROC|XCCLOSE, 254 coproc.readw); 255 break; 256 } 257 #endif /* KSH */ 258 259 case TASYNC: 260 /* XXX non-optimal, I think - "(foo &)", forks for (), 261 * forks again for async... parent should optimize 262 * this to "foo &"... 263 */ 264 rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK); 265 break; 266 267 case TOR: 268 case TAND: 269 rv = execute(t->left, XERROK); 270 if (t->right != NULL && (rv == 0) == (t->type == TAND)) 271 rv = execute(t->right, flags & XERROK); 272 else 273 flags |= XERROK; 274 break; 275 276 case TBANG: 277 rv = !execute(t->right, XERROK); 278 break; 279 280 #ifdef KSH 281 case TDBRACKET: 282 { 283 Test_env te; 284 285 te.flags = TEF_DBRACKET; 286 te.pos.wp = t->args; 287 te.isa = dbteste_isa; 288 te.getopnd = dbteste_getopnd; 289 te.eval = dbteste_eval; 290 te.error = dbteste_error; 291 292 rv = test_parse(&te); 293 break; 294 } 295 #endif /* KSH */ 296 297 case TFOR: 298 #ifdef KSH 299 case TSELECT: 300 { 301 volatile bool_t is_first = TRUE; 302 #endif /* KSH */ 303 ap = (t->vars != NULL) ? 304 eval(t->vars, DOBLANK|DOGLOB|DOTILDE) 305 : e->loc->argv + 1; 306 e->type = E_LOOP; 307 while (1) { 308 i = ksh_sigsetjmp(e->jbuf, 0); 309 if (!i) 310 break; 311 if ((e->flags&EF_BRKCONT_PASS) 312 || (i != LBREAK && i != LCONTIN)) 313 { 314 quitenv(); 315 unwind(i); 316 } else if (i == LBREAK) { 317 rv = 0; 318 goto Break; 319 } 320 } 321 rv = 0; /* in case of a continue */ 322 if (t->type == TFOR) { 323 struct tbl *vq; 324 325 while (*ap != NULL) { 326 vq = global(t->str); 327 if (vq->flag & RDONLY) 328 errorf("%s is read only", t->str); 329 setstr(vq, *ap++); 330 rv = execute(t->left, flags & XERROK); 331 } 332 } 333 #ifdef KSH 334 else { /* TSELECT */ 335 struct tbl *vq; 336 337 for (;;) { 338 if (!(cp = do_selectargs(ap, is_first))) { 339 rv = 1; 340 break; 341 } 342 is_first = FALSE; 343 vq = global(t->str); 344 if (vq->flag & RDONLY) 345 errorf("%s is read only", t->str); 346 setstr(vq, cp); 347 rv = execute(t->left, flags & XERROK); 348 } 349 } 350 } 351 #endif /* KSH */ 352 break; 353 354 case TWHILE: 355 case TUNTIL: 356 e->type = E_LOOP; 357 while (1) { 358 i = ksh_sigsetjmp(e->jbuf, 0); 359 if (!i) 360 break; 361 if ((e->flags&EF_BRKCONT_PASS) 362 || (i != LBREAK && i != LCONTIN)) 363 { 364 quitenv(); 365 unwind(i); 366 } else if (i == LBREAK) { 367 rv = 0; 368 goto Break; 369 } 370 } 371 rv = 0; /* in case of a continue */ 372 while ((execute(t->left, XERROK) == 0) == (t->type == TWHILE)) 373 rv = execute(t->right, flags & XERROK); 374 break; 375 376 case TIF: 377 case TELIF: 378 if (t->right == NULL) 379 break; /* should be error */ 380 rv = execute(t->left, XERROK) == 0 ? 381 execute(t->right->left, flags & XERROK) : 382 execute(t->right->right, flags & XERROK); 383 break; 384 385 case TCASE: 386 cp = evalstr(t->str, DOTILDE); 387 for (t = t->left; t != NULL && t->type == TPAT; t = t->right) 388 for (ap = t->vars; *ap; ap++) 389 if ((s = evalstr(*ap, DOTILDE|DOPAT)) 390 && gmatch(cp, s, FALSE)) 391 goto Found; 392 break; 393 Found: 394 rv = execute(t->left, flags & XERROK); 395 break; 396 397 case TBRACE: 398 rv = execute(t->left, flags & XERROK); 399 break; 400 401 case TFUNCT: 402 rv = define(t->str, t); 403 break; 404 405 case TTIME: 406 rv = timex(t, flags); 407 break; 408 409 case TEXEC: /* an eval'd TCOM */ 410 s = t->args[0]; 411 ap = makenv(); 412 #ifndef F_SETFD 413 for (i = 0; i < sizeof(clexec_tab); i++) 414 if (clexec_tab[i]) { 415 close(i); 416 clexec_tab[i] = 0; 417 } 418 #endif 419 restoresigs(); 420 cleanup_proc_env(); 421 ksh_execve(t->str, t->args, ap); 422 if (errno == ENOEXEC) 423 scriptexec(t, ap); 424 else 425 errorf("%s: %s", s, strerror(errno)); 426 } 427 Break: 428 exstat = rv; 429 430 quitenv(); /* restores IO */ 431 if ((flags&XEXEC)) 432 exit(rv); /* exit child */ 433 if (rv != 0 && !(flags & XERROK)) { 434 if (Flag(FERREXIT)) 435 unwind(LERROR); 436 trapsig(SIGERR_); 437 } 438 return rv; 439 } 440 441 /* 442 * execute simple command 443 */ 444 445 static int 446 comexec(t, tp, ap, flags) 447 struct op *t; 448 struct tbl *volatile tp; 449 register char **ap; 450 int volatile flags; 451 { 452 int i; 453 int rv = 0; 454 register char *cp; 455 register char **lastp; 456 static struct op texec; /* Must be static (XXX but why?) */ 457 int type_flags; 458 int keepasn_ok; 459 int fcflags = FC_BI|FC_FUNC|FC_PATH; 460 461 /* snag the last argument for $_ XXX not the same as at&t ksh, 462 * which only seems to set $_ after a newline (but not in 463 * functions/dot scripts, but in interactive and scipt) - 464 * perhaps save last arg here and set it in shell()?. 465 */ 466 if (*(lastp = ap)) { 467 while (*++lastp) 468 ; 469 setstr(typeset("_", LOCAL, 0, 0, 0), *--lastp); 470 } 471 472 /* Deal with the shell builtins builtin, exec and command since 473 * they can be followed by other commands. This must be done before 474 * we know if we should create a local block, which must be done 475 * before we can do a path search (in case the assignments change 476 * PATH). 477 * Odd cases: 478 * FOO=bar exec > /dev/null FOO is kept but not exported 479 * FOO=bar exec foobar FOO is exported 480 * FOO=bar command exec > /dev/null FOO is neither kept nor exported 481 * FOO=bar command FOO is neither kept nor exported 482 * PATH=... foobar use new PATH in foobar search 483 */ 484 keepasn_ok = 1; 485 while (tp && tp->type == CSHELL) { 486 fcflags = FC_BI|FC_FUNC|FC_PATH;/* undo effects of command */ 487 if (tp->val.f == c_builtin) { 488 if ((cp = *++ap) == NULL) { 489 tp = NULL; 490 break; 491 } 492 tp = findcom(cp, FC_BI); 493 if (tp == NULL) 494 errorf("builtin: %s: not a builtin", cp); 495 continue; 496 } else if (tp->val.f == c_exec) { 497 if (ap[1] == NULL) 498 break; 499 ap++; 500 flags |= XEXEC; 501 } else if (tp->val.f == c_command) { 502 int optc, saw_p = 0; 503 504 /* Ugly dealing with options in two places (here and 505 * in c_command(), but such is life) 506 */ 507 ksh_getopt_reset(&builtin_opt, 0); 508 while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) 509 == 'p') 510 saw_p = 1; 511 if (optc != EOF) 512 break; /* command -vV or something */ 513 /* don't look for functions */ 514 fcflags = FC_BI|FC_PATH; 515 if (saw_p) { 516 if (Flag(FRESTRICTED)) { 517 warningf(TRUE, 518 "command -p: restricted"); 519 rv = 1; 520 goto Leave; 521 } 522 fcflags |= FC_DEFPATH; 523 } 524 ap += builtin_opt.optind; 525 /* POSIX says special builtins lose their status 526 * if accessed using command. 527 */ 528 keepasn_ok = 0; 529 if (!ap[0]) { 530 /* ensure command with no args exits with 0 */ 531 subst_exstat = 0; 532 break; 533 } 534 } else 535 break; 536 tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC)); 537 } 538 if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN)))) 539 type_flags = 0; 540 else { 541 /* create new variable/function block */ 542 newblock(); 543 /* ksh functions don't keep assignments, POSIX functions do. */ 544 if (keepasn_ok && tp && tp->type == CFUNC 545 && !(tp->flag & FKSH)) 546 type_flags = 0; 547 else 548 type_flags = LOCAL|LOCAL_COPY|EXPORT; 549 } 550 if (Flag(FEXPORT)) 551 type_flags |= EXPORT; 552 for (i = 0; t->vars[i]; i++) { 553 cp = evalstr(t->vars[i], DOASNTILDE); 554 if (Flag(FXTRACE)) { 555 if (i == 0) 556 shf_fprintf(shl_out, "%s", 557 PS4_SUBSTITUTE(str_val(global("PS4")))); 558 shf_fprintf(shl_out, "%s%s", cp, 559 t->vars[i + 1] ? space : newline); 560 if (!t->vars[i + 1]) 561 shf_flush(shl_out); 562 } 563 typeset(cp, type_flags, 0, 0, 0); 564 } 565 566 if ((cp = *ap) == NULL) { 567 rv = subst_exstat; 568 goto Leave; 569 } else if (!tp) { 570 if (Flag(FRESTRICTED) && ksh_strchr_dirsep(cp)) { 571 warningf(TRUE, "%s: restricted", cp); 572 rv = 1; 573 goto Leave; 574 } 575 tp = findcom(cp, fcflags); 576 } 577 578 switch (tp->type) { 579 case CSHELL: /* shell built-in */ 580 rv = call_builtin(tp, ap); 581 break; 582 583 case CFUNC: /* function call */ 584 { 585 volatile int old_xflag; 586 volatile Tflag old_inuse; 587 const char *volatile old_kshname; 588 589 if (!(tp->flag & ISSET)) { 590 struct tbl *ftp; 591 592 if (!tp->u.fpath) { 593 if (tp->u2.errno_) { 594 warningf(TRUE, 595 "%s: can't find function definition file - %s", 596 cp, strerror(tp->u2.errno_)); 597 rv = 126; 598 } else { 599 warningf(TRUE, 600 "%s: can't find function definition file", cp); 601 rv = 127; 602 } 603 break; 604 } 605 if (include(tp->u.fpath, 0, (char **) 0, 0) < 0) { 606 warningf(TRUE, 607 "%s: can't open function definition file %s - %s", 608 cp, tp->u.fpath, strerror(errno)); 609 rv = 127; 610 break; 611 } 612 if (!(ftp = findfunc(cp, hash(cp), FALSE)) 613 || !(ftp->flag & ISSET)) 614 { 615 warningf(TRUE, 616 "%s: function not defined by %s", 617 cp, tp->u.fpath); 618 rv = 127; 619 break; 620 } 621 tp = ftp; 622 } 623 624 /* ksh functions set $0 to function name, POSIX functions leave 625 * $0 unchanged. 626 */ 627 old_kshname = kshname; 628 if (tp->flag & FKSH) 629 kshname = ap[0]; 630 e->loc->argv = ap; 631 for (i = 0; *ap++ != NULL; i++) 632 ; 633 e->loc->argc = i - 1; 634 getopts_reset(1); 635 636 old_xflag = Flag(FXTRACE); 637 Flag(FXTRACE) = tp->flag & TRACE ? TRUE : FALSE; 638 639 old_inuse = tp->flag & FINUSE; 640 tp->flag |= FINUSE; 641 642 e->type = E_FUNC; 643 i = ksh_sigsetjmp(e->jbuf, 0); 644 if (i == 0) { 645 /* seems odd to pass XERROK here, but at&t ksh does */ 646 exstat = execute(tp->val.t, flags & XERROK); 647 i = LRETURN; 648 } 649 kshname = old_kshname; 650 Flag(FXTRACE) = old_xflag; 651 tp->flag = (tp->flag & ~FINUSE) | old_inuse; 652 /* Were we deleted while executing? If so, free the execution 653 * tree. todo: Unfortunately, the table entry is never re-used 654 * until the lookup table is expanded. 655 */ 656 if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) { 657 if (tp->flag & ALLOC) { 658 tp->flag &= ~ALLOC; 659 tfree(tp->val.t, tp->areap); 660 } 661 tp->flag = 0; 662 } 663 switch (i) { 664 case LRETURN: 665 case LERROR: 666 rv = exstat; 667 break; 668 case LINTR: 669 case LEXIT: 670 case LLEAVE: 671 case LSHELL: 672 quitenv(); 673 unwind(i); 674 /*NOTREACHED*/ 675 default: 676 quitenv(); 677 internal_errorf(1, "CFUNC %d", i); 678 } 679 break; 680 } 681 682 case CEXEC: /* executable command */ 683 case CTALIAS: /* tracked alias */ 684 if (!(tp->flag&ISSET)) { 685 /* errno_ will be set if the named command was found 686 * but could not be executed (permissions, no execute 687 * bit, directory, etc). Print out a (hopefully) 688 * useful error message and set the exit status to 126. 689 */ 690 if (tp->u2.errno_) { 691 warningf(TRUE, "%s: cannot execute - %s", cp, 692 strerror(tp->u2.errno_)); 693 rv = 126; /* POSIX */ 694 } else { 695 warningf(TRUE, "%s: not found", cp); 696 rv = 127; 697 } 698 break; 699 } 700 701 /* set $_ to program's full path */ 702 setstr(typeset("_", LOCAL|EXPORT, 0, 0, 0), tp->val.s); 703 704 if (flags&XEXEC) { 705 j_exit(); 706 if (!(flags&XBGND) || Flag(FMONITOR)) { 707 setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG); 708 setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG); 709 } 710 } 711 712 /* to fork we set up a TEXEC node and call execute */ 713 texec.type = TEXEC; 714 texec.left = t; /* for tprint */ 715 texec.str = tp->val.s; 716 texec.args = ap; 717 rv = exchild(&texec, flags, -1); 718 break; 719 } 720 Leave: 721 if (flags & XEXEC) { 722 exstat = rv; 723 unwind(LLEAVE); 724 } 725 return rv; 726 } 727 728 static void 729 scriptexec(tp, ap) 730 register struct op *tp; 731 register char **ap; 732 { 733 char *shell; 734 735 shell = str_val(global(EXECSHELL_STR)); 736 if (shell && *shell) 737 shell = search(shell, path, X_OK, (int *) 0); 738 if (!shell || !*shell) 739 shell = EXECSHELL; 740 741 *tp->args-- = tp->str; 742 #ifdef SHARPBANG 743 { 744 char buf[LINE]; 745 register char *cp; 746 register int fd, n; 747 748 buf[0] = '\0'; 749 if ((fd = open(tp->str, O_RDONLY)) >= 0) { 750 if ((n = read(fd, buf, LINE - 1)) > 0) 751 buf[n] = '\0'; 752 (void) close(fd); 753 } 754 if ((buf[0] == '#' && buf[1] == '!' && (cp = &buf[2])) 755 # ifdef OS2 756 || (strncmp(buf, "extproc", 7) == 0 && isspace(buf[7]) 757 && (cp = &buf[7])) 758 # endif /* OS2 */ 759 ) 760 { 761 while (*cp && (*cp == ' ' || *cp == '\t')) 762 cp++; 763 if (*cp && *cp != '\n') { 764 char *a0 = cp, *a1 = (char *) 0; 765 # ifdef OS2 766 char *a2 = cp; 767 # endif /* OS2 */ 768 769 while (*cp && *cp != '\n' && *cp != ' ' 770 && *cp != '\t') 771 { 772 # ifdef OS2 773 /* Allow shell search without prepended path 774 * if shell with / in pathname cannot be found. 775 * Use / explicitly so \ can be used if explicit 776 * needs to be forced. 777 */ 778 if (*cp == '/') 779 a2 = cp + 1; 780 # endif /* OS2 */ 781 cp++; 782 } 783 if (*cp && *cp != '\n') { 784 *cp++ = '\0'; 785 while (*cp 786 && (*cp == ' ' || *cp == '\t')) 787 cp++; 788 if (*cp && *cp != '\n') { 789 a1 = cp; 790 /* all one argument */ 791 while (*cp && *cp != '\n') 792 cp++; 793 } 794 } 795 if (*cp == '\n') { 796 *cp = '\0'; 797 if (a1) 798 *tp->args-- = a1; 799 # ifdef OS2 800 if (a0 != a2 && search_access(a0, X_OK, (int *) 0)) 801 a0 = a2; 802 # endif /* OS2 */ 803 shell = a0; 804 } 805 } 806 # ifdef OS2 807 } else { 808 /* Use ksh documented shell default if present 809 * else use OS2_SHELL which is assumed to need 810 * the /c option and '\' as dir separater. 811 */ 812 char *p = shell; 813 814 shell = str_val(global("EXECSHELL")); 815 if (shell && *shell) 816 shell = search(shell, path, X_OK, (int *) 0); 817 if (!shell || !*shell) { 818 shell = p; 819 *tp->args-- = "/c"; 820 for (p = tp->str; *p; p++) 821 if (*p == '/') 822 *p = '\\'; 823 } 824 # endif /* OS2 */ 825 } 826 } 827 #endif /* SHARPBANG */ 828 *tp->args = shell; 829 830 ksh_execve(tp->args[0], tp->args, ap); 831 832 /* report both the program that was run and the bogus shell */ 833 errorf("%s: %s: %s", tp->str, shell, strerror(errno)); 834 } 835 836 int 837 shcomexec(wp) 838 register char **wp; 839 { 840 register struct tbl *tp; 841 842 tp = tsearch(&builtins, *wp, hash(*wp)); 843 if (tp == NULL) 844 internal_errorf(1, "shcomexec: %s", *wp); 845 return call_builtin(tp, wp); 846 } 847 848 /* 849 * Search function tables for a function. If create set, a table entry 850 * is created if none is found. 851 */ 852 struct tbl * 853 findfunc(name, h, create) 854 const char *name; 855 unsigned int h; 856 int create; 857 { 858 struct block *l; 859 struct tbl *tp = (struct tbl *) 0; 860 861 for (l = e->loc; l; l = l->next) { 862 tp = tsearch(&l->funs, name, h); 863 if (tp) 864 break; 865 if (!l->next && create) { 866 tp = tenter(&l->funs, name, h); 867 tp->flag = DEFINED; 868 tp->type = CFUNC; 869 tp->val.t = (struct op *) 0; 870 break; 871 } 872 } 873 return tp; 874 } 875 876 /* 877 * define function. Returns 1 if function is being undefined (t == 0) and 878 * function did not exist, returns 0 otherwise. 879 */ 880 int 881 define(name, t) 882 const char *name; 883 struct op *t; 884 { 885 struct tbl *tp; 886 int was_set = 0; 887 888 while (1) { 889 tp = findfunc(name, hash(name), TRUE); 890 891 if (tp->flag & ISSET) 892 was_set = 1; 893 /* If this function is currently being executed, we zap this 894 * table entry so findfunc() won't see it 895 */ 896 if (tp->flag & FINUSE) { 897 tp->name[0] = '\0'; 898 tp->flag &= ~DEFINED; /* ensure it won't be found */ 899 tp->flag |= FDELETE; 900 } else 901 break; 902 } 903 904 if (tp->flag & ALLOC) { 905 tp->flag &= ~(ISSET|ALLOC); 906 tfree(tp->val.t, tp->areap); 907 } 908 909 if (t == NULL) { /* undefine */ 910 tdelete(tp); 911 return was_set ? 0 : 1; 912 } 913 914 tp->val.t = tcopy(t->left, tp->areap); 915 tp->flag |= (ISSET|ALLOC); 916 if (t->u.ksh_func) 917 tp->flag |= FKSH; 918 919 return 0; 920 } 921 922 /* 923 * add builtin 924 */ 925 void 926 builtin(name, func) 927 const char *name; 928 int (*func) ARGS((char **)); 929 { 930 register struct tbl *tp; 931 Tflag flag; 932 933 /* see if any flags should be set for this builtin */ 934 for (flag = 0; ; name++) { 935 if (*name == '=') /* command does variable assignment */ 936 flag |= KEEPASN; 937 else if (*name == '*') /* POSIX special builtin */ 938 flag |= SPEC_BI; 939 else if (*name == '+') /* POSIX regular builtin */ 940 flag |= REG_BI; 941 else 942 break; 943 } 944 945 tp = tenter(&builtins, name, hash(name)); 946 tp->flag = DEFINED | flag; 947 tp->type = CSHELL; 948 tp->val.f = func; 949 } 950 951 /* 952 * find command 953 * either function, hashed command, or built-in (in that order) 954 */ 955 struct tbl * 956 findcom(name, flags) 957 const char *name; 958 int flags; /* FC_* */ 959 { 960 static struct tbl temp; 961 unsigned int h = hash(name); 962 struct tbl *tp = NULL, *tbi; 963 int insert = Flag(FTRACKALL); /* insert if not found */ 964 char *fpath; /* for function autoloading */ 965 char *npath; 966 967 if (ksh_strchr_dirsep(name) != NULL) { 968 insert = 0; 969 /* prevent FPATH search below */ 970 flags &= ~FC_FUNC; 971 goto Search; 972 } 973 tbi = (flags & FC_BI) ? tsearch(&builtins, name, h) : NULL; 974 /* POSIX says special builtins first, then functions, then 975 * POSIX regular builtins, then search path... 976 */ 977 if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI)) 978 tp = tbi; 979 if (!tp && (flags & FC_FUNC)) { 980 tp = findfunc(name, h, FALSE); 981 if (tp && !(tp->flag & ISSET)) { 982 if ((fpath = str_val(global("FPATH"))) == null) { 983 tp->u.fpath = (char *) 0; 984 tp->u2.errno_ = 0; 985 } else 986 tp->u.fpath = search(name, fpath, R_OK, 987 &tp->u2.errno_); 988 } 989 } 990 if (!tp && (flags & FC_REGBI) && tbi && (tbi->flag & REG_BI)) 991 tp = tbi; 992 /* todo: posix says non-special/non-regular builtins must 993 * be triggered by some user-controllable means like a 994 * special directory in PATH. Requires modifications to 995 * the search() function. Tracked aliases should be 996 * modified to allow tracking of builtin commands. 997 * This should be under control of the FPOSIX flag. 998 * If this is changed, also change c_whence... 999 */ 1000 if (!tp && (flags & FC_UNREGBI) && tbi) 1001 tp = tbi; 1002 if (!tp && (flags & FC_PATH) && !(flags & FC_DEFPATH)) { 1003 tp = tsearch(&taliases, name, h); 1004 if (tp && (tp->flag & ISSET) && eaccess(tp->val.s, X_OK) != 0) { 1005 if (tp->flag & ALLOC) { 1006 tp->flag &= ~ALLOC; 1007 afree(tp->val.s, APERM); 1008 } 1009 tp->flag &= ~ISSET; 1010 } 1011 } 1012 1013 Search: 1014 if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) 1015 && (flags & FC_PATH)) 1016 { 1017 if (!tp) { 1018 if (insert && !(flags & FC_DEFPATH)) { 1019 tp = tenter(&taliases, name, h); 1020 tp->type = CTALIAS; 1021 } else { 1022 tp = &temp; 1023 tp->type = CEXEC; 1024 } 1025 tp->flag = DEFINED; /* make ~ISSET */ 1026 } 1027 npath = search(name, flags & FC_DEFPATH ? def_path : path, 1028 X_OK, &tp->u2.errno_); 1029 if (npath) { 1030 tp->val.s = tp == &temp ? npath : str_save(npath, APERM); 1031 tp->flag |= ISSET|ALLOC; 1032 } else if ((flags & FC_FUNC) 1033 && (fpath = str_val(global("FPATH"))) != null 1034 && (npath = search(name, fpath, R_OK, 1035 &tp->u2.errno_)) != (char *) 0) 1036 { 1037 /* An undocumented feature of at&t ksh is that it 1038 * searches FPATH if a command is not found, even 1039 * if the command hasn't been set up as an autoloaded 1040 * function (ie, no typeset -uf). 1041 */ 1042 tp = &temp; 1043 tp->type = CFUNC; 1044 tp->flag = DEFINED; /* make ~ISSET */ 1045 tp->u.fpath = npath; 1046 } 1047 } 1048 return tp; 1049 } 1050 1051 /* 1052 * flush executable commands with relative paths 1053 */ 1054 void 1055 flushcom(all) 1056 int all; /* just relative or all */ 1057 { 1058 struct tbl *tp; 1059 struct tstate ts; 1060 1061 for (twalk(&ts, &taliases); (tp = tnext(&ts)) != NULL; ) 1062 if ((tp->flag&ISSET) && (all || !ISDIRSEP(tp->val.s[0]))) { 1063 if (tp->flag&ALLOC) { 1064 tp->flag &= ~(ALLOC|ISSET); 1065 afree(tp->val.s, APERM); 1066 } 1067 tp->flag = ~ISSET; 1068 } 1069 } 1070 1071 /* Check if path is something we want to find. Returns -1 for failure. */ 1072 int 1073 search_access(path, mode, errnop) 1074 const char *path; 1075 int mode; 1076 int *errnop; /* set if candidate found, but not suitable */ 1077 { 1078 #ifndef OS2 1079 int ret, err = 0; 1080 struct stat statb; 1081 1082 if (stat(path, &statb) < 0) 1083 return -1; 1084 ret = eaccess(path, mode); 1085 if (ret < 0) 1086 err = errno; /* File exists, but we can't access it */ 1087 else if (mode == X_OK && (!S_ISREG(statb.st_mode) 1088 /* This 'cause access() says root can execute everything */ 1089 || !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))) 1090 { 1091 ret = -1; 1092 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1093 } 1094 if (err && errnop) 1095 *errnop = err; 1096 return ret; 1097 #else /* !OS2 */ 1098 /* 1099 * NOTE: ASSUMES path can be modified and has enough room at the 1100 * end of the string for a suffix (ie, 4 extra characters). 1101 * Certain code knows this (eg, eval.c(globit()), 1102 * exec.c(search())). 1103 */ 1104 static char *xsuffixes[] = { ".ksh", ".exe", ".", ".sh", ".cmd", 1105 ".com", ".bat", (char *) 0 1106 }; 1107 static char *rsuffixes[] = { ".ksh", ".", ".sh", ".cmd", ".bat", 1108 (char *) 0 1109 }; 1110 int i; 1111 char *mpath = (char *) path; 1112 char *tp = mpath + strlen(mpath); 1113 char *p; 1114 char **sfx; 1115 1116 /* If a suffix has been specified, check if it is one of the 1117 * suffixes that indicate the file is executable - if so, change 1118 * the access test to R_OK... 1119 * This code assumes OS/2 files can have only one suffix... 1120 */ 1121 if ((p = strrchr((p = ksh_strrchr_dirsep(mpath)) ? p : mpath, '.'))) { 1122 if (mode == X_OK) 1123 mode = R_OK; 1124 return search_access1(mpath, mode, errnop); 1125 } 1126 /* Try appending the various suffixes. Different suffixes for 1127 * read and execute 'cause we don't want to read an executable... 1128 */ 1129 sfx = mode == R_OK ? rsuffixes : xsuffixes; 1130 for (i = 0; sfx[i]; i++) { 1131 strcpy(tp, p = sfx[i]); 1132 if (search_access1(mpath, R_OK, errnop) == 0) 1133 return 0; 1134 *tp = '\0'; 1135 } 1136 return -1; 1137 #endif /* !OS2 */ 1138 } 1139 1140 #ifdef OS2 1141 static int 1142 search_access1(path, mode, errnop) 1143 const char *path; 1144 int mode; 1145 int *errnop; /* set if candidate found, but not suitable */ 1146 { 1147 int ret, err = 0; 1148 struct stat statb; 1149 1150 if (stat(path, &statb) < 0) 1151 return -1; 1152 ret = eaccess(path, mode); 1153 if (ret < 0) 1154 err = errno; /* File exists, but we can't access it */ 1155 else if (!S_ISREG(statb.st_mode)) { 1156 ret = -1; 1157 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1158 } 1159 if (err && errnop) 1160 *errnop = err; 1161 return ret; 1162 } 1163 #endif /* OS2 */ 1164 1165 /* 1166 * search for command with PATH 1167 */ 1168 char * 1169 search(name, path, mode, errnop) 1170 const char *name; 1171 const char *path; 1172 int mode; /* R_OK or X_OK */ 1173 int *errnop; /* set if candidate found, but not suitable */ 1174 { 1175 const char *sp, *p; 1176 char *xp; 1177 XString xs; 1178 int namelen; 1179 1180 if (errnop) 1181 *errnop = 0; 1182 #ifdef OS2 1183 /* Xinit() allocates 8 additional bytes, so appended suffixes won't 1184 * overflow the memory. 1185 */ 1186 namelen = strlen(name) + 1; 1187 Xinit(xs, xp, namelen, ATEMP); 1188 memcpy(Xstring(xs, xp), name, namelen); 1189 1190 if (ksh_strchr_dirsep(name)) { 1191 if (search_access(Xstring(xs, xp), mode, errnop) >= 0) 1192 return Xstring(xs, xp); /* not Xclose() - see above */ 1193 Xfree(xs, xp); 1194 return NULL; 1195 } 1196 1197 /* Look in current context always. (os2 style) */ 1198 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1199 return Xstring(xs, xp); /* not Xclose() - xp may be wrong */ 1200 #else /* OS2 */ 1201 if (ksh_strchr_dirsep(name)) { 1202 if (search_access(name, mode, errnop) == 0) 1203 return (char *) name; 1204 return NULL; 1205 } 1206 1207 namelen = strlen(name) + 1; 1208 Xinit(xs, xp, 128, ATEMP); 1209 #endif /* OS2 */ 1210 1211 sp = path; 1212 while (sp != NULL) { 1213 xp = Xstring(xs, xp); 1214 if (!(p = strchr(sp, PATHSEP))) 1215 p = sp + strlen(sp); 1216 if (p != sp) { 1217 XcheckN(xs, xp, p - sp); 1218 memcpy(xp, sp, p - sp); 1219 xp += p - sp; 1220 *xp++ = DIRSEP; 1221 } 1222 sp = p; 1223 XcheckN(xs, xp, namelen); 1224 memcpy(xp, name, namelen); 1225 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1226 #ifdef OS2 1227 return Xstring(xs, xp); /* Not Xclose() - see above */ 1228 #else /* OS2 */ 1229 return Xclose(xs, xp + namelen); 1230 #endif /* OS2 */ 1231 if (*sp++ == '\0') 1232 sp = NULL; 1233 } 1234 Xfree(xs, xp); 1235 return NULL; 1236 } 1237 1238 static int 1239 call_builtin(tp, wp) 1240 struct tbl *tp; 1241 char **wp; 1242 { 1243 int rv; 1244 1245 builtin_argv0 = wp[0]; 1246 builtin_flag = tp->flag; 1247 shf_reopen(1, SHF_WR, shl_stdout); 1248 shl_stdout_ok = 1; 1249 ksh_getopt_reset(&builtin_opt, GF_ERROR); 1250 rv = (*tp->val.f)(wp); 1251 shf_flush(shl_stdout); 1252 shl_stdout_ok = 0; 1253 builtin_flag = 0; 1254 builtin_argv0 = (char *) 0; 1255 return rv; 1256 } 1257 1258 /* 1259 * set up redirection, saving old fd's in e->savefd 1260 */ 1261 static int 1262 iosetup(iop, tp) 1263 register struct ioword *iop; 1264 struct tbl *tp; 1265 { 1266 register int u = -1; 1267 char *cp = iop->name; 1268 int iotype = iop->flag & IOTYPE; 1269 int do_open = 1, do_close = 0, UNINITIALIZED(flags); 1270 struct ioword iotmp; 1271 struct stat statb; 1272 1273 if (iotype != IOHERE) 1274 cp = evalonestr(cp, DOTILDE|(Flag(FTALKING) ? DOGLOB : 0)); 1275 1276 /* Used for tracing and error messages to print expanded cp */ 1277 iotmp = *iop; 1278 iotmp.name = (iotype == IOHERE) ? (char *) 0 : cp; 1279 iotmp.flag |= IONAMEXP; 1280 1281 if (Flag(FXTRACE)) 1282 shellf("%s%s\n", 1283 PS4_SUBSTITUTE(str_val(global("PS4"))), 1284 snptreef((char *) 0, 32, "%R", &iotmp)); 1285 1286 switch (iotype) { 1287 case IOREAD: 1288 flags = O_RDONLY; 1289 break; 1290 1291 case IOCAT: 1292 flags = O_WRONLY | O_APPEND | O_CREAT; 1293 break; 1294 1295 case IOWRITE: 1296 flags = O_WRONLY | O_CREAT | O_TRUNC; 1297 if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) 1298 && (stat(cp, &statb) < 0 || S_ISREG(statb.st_mode))) 1299 flags |= O_EXCL; 1300 break; 1301 1302 case IORDWR: 1303 flags = O_RDWR | O_CREAT; 1304 break; 1305 1306 case IOHERE: 1307 do_open = 0; 1308 /* herein() returns -2 if error has been printed */ 1309 u = herein(cp, iop->flag & IOEVAL); 1310 /* cp may have wrong name */ 1311 break; 1312 1313 case IODUP: 1314 { 1315 const char *emsg; 1316 1317 do_open = 0; 1318 if (*cp == '-' && !cp[1]) { 1319 u = 1009; /* prevent error return below */ 1320 do_close = 1; 1321 } else if ((u = check_fd(cp, 1322 X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK), 1323 &emsg)) < 0) 1324 { 1325 warningf(TRUE, "%s: %s", 1326 snptreef((char *) 0, 32, "%R", &iotmp), emsg); 1327 return -1; 1328 } 1329 break; 1330 } 1331 } 1332 if (do_open) { 1333 if (Flag(FRESTRICTED) && (flags & O_CREAT)) { 1334 warningf(TRUE, "%s: restricted", cp); 1335 return -1; 1336 } 1337 u = open(cp, flags, 0666); 1338 #ifdef OS2 1339 if (u < 0 && strcmp(cp, "/dev/null") == 0) 1340 u = open("nul", flags, 0666); 1341 #endif /* OS2 */ 1342 } 1343 if (u < 0) { 1344 /* herein() may already have printed message */ 1345 if (u == -1) 1346 warningf(TRUE, "cannot %s %s: %s", 1347 iotype == IODUP ? "dup" 1348 : (iotype == IOREAD || iotype == IOHERE) ? 1349 "open" : "create", cp, strerror(errno)); 1350 return -1; 1351 } 1352 /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ 1353 if (e->savefd[iop->unit] == 0) 1354 /* c_exec() assumes e->savefd[fd] set for any redirections. 1355 * Ask savefd() not to close iop->unit - allows error messages 1356 * to be seen if iop->unit is 2; also means we can't lose 1357 * the fd (eg, both dup2 below and dup2 in restfd() failing). 1358 */ 1359 e->savefd[iop->unit] = savefd(iop->unit, 1); 1360 1361 if (do_close) 1362 close(iop->unit); 1363 else if (u != iop->unit) { 1364 if (ksh_dup2(u, iop->unit, TRUE) < 0) { 1365 warningf(TRUE, 1366 "could not finish (dup) redirection %s: %s", 1367 snptreef((char *) 0, 32, "%R", &iotmp), 1368 strerror(errno)); 1369 if (iotype != IODUP) 1370 close(u); 1371 return -1; 1372 } 1373 if (iotype != IODUP) 1374 close(u); 1375 #ifdef KSH 1376 /* Touching any co-process fd in an empty exec 1377 * causes the shell to close its copies 1378 */ 1379 else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { 1380 if (iop->flag & IORDUP) /* possible exec <&p */ 1381 coproc_read_close(u); 1382 else /* possible exec >&p */ 1383 coproc_write_close(u); 1384 } 1385 #endif /* KSH */ 1386 } 1387 if (u == 2) /* Clear any write errors */ 1388 shf_reopen(2, SHF_WR, shl_out); 1389 return 0; 1390 } 1391 1392 /* 1393 * open here document temp file. 1394 * if unquoted here, expand here temp file into second temp file. 1395 */ 1396 static int 1397 herein(hname, sub) 1398 char *hname; 1399 int sub; 1400 { 1401 int fd; 1402 1403 /* ksh -c 'cat << EOF' can cause this... */ 1404 if (hname == (char *) 0) { 1405 warningf(TRUE, "here document missing"); 1406 return -2; /* special to iosetup(): don't print error */ 1407 } 1408 if (sub) { 1409 char *cp; 1410 struct source *s, *volatile osource = source; 1411 struct temp *h; 1412 struct shf *volatile shf; 1413 int i; 1414 1415 /* must be before newenv() 'cause shf uses ATEMP */ 1416 shf = shf_open(hname, O_RDONLY, 0, SHF_MAPHI|SHF_CLEXEC); 1417 if (shf == NULL) 1418 return -1; 1419 newenv(E_ERRH); 1420 i = ksh_sigsetjmp(e->jbuf, 0); 1421 if (i) { 1422 if (shf) 1423 shf_close(shf); 1424 source = osource; 1425 quitenv(); /* after shf_close() due to alloc */ 1426 return -2; /* special to iosetup(): don't print error */ 1427 } 1428 /* set up yylex input from here file */ 1429 s = pushs(SFILE, ATEMP); 1430 s->u.shf = shf; 1431 source = s; 1432 if (yylex(ONEWORD) != LWORD) 1433 internal_errorf(1, "herein: yylex"); 1434 shf_close(shf); 1435 shf = (struct shf *) 0; 1436 cp = evalstr(yylval.cp, 0); 1437 1438 /* write expanded input to another temp file */ 1439 h = maketemp(ATEMP); 1440 h->next = e->temps; e->temps = h; 1441 if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) 1442 /* shf closeed by error handler */ 1443 errorf("%s: %s", h->name, strerror(errno)); 1444 shf_puts(cp, shf); 1445 if (shf_close(shf) == EOF) { 1446 close(fd); 1447 shf = (struct shf *) 0; 1448 errorf("error writing %s: %s", h->name, 1449 strerror(errno)); 1450 } 1451 shf = (struct shf *) 0; 1452 1453 quitenv(); 1454 } else { 1455 fd = open(hname, O_RDONLY, 0); 1456 if (fd < 0) 1457 return -1; 1458 } 1459 1460 return fd; 1461 } 1462 1463 #ifdef KSH 1464 /* 1465 * ksh special - the select command processing section 1466 * print the args in column form - assuming that we can 1467 */ 1468 static char * 1469 do_selectargs(ap, print_menu) 1470 register char **ap; 1471 bool_t print_menu; 1472 { 1473 static const char *const read_args[] = { 1474 "read", "-r", "REPLY", (char *) 0 1475 }; 1476 char *s; 1477 int i, argct; 1478 1479 for (argct = 0; ap[argct]; argct++) 1480 ; 1481 while (1) { 1482 /* Menu is printed if 1483 * - this is the first time around the select loop 1484 * - the user enters a blank line 1485 * - the REPLY parameter is empty 1486 */ 1487 if (print_menu || !*str_val(global("REPLY"))) 1488 pr_menu(ap); 1489 shellf("%s", str_val(global("PS3"))); 1490 if (call_builtin(findcom("read", FC_BI), (char **) read_args)) 1491 return (char *) 0; 1492 s = str_val(global("REPLY")); 1493 if (*s) { 1494 i = atoi(s); 1495 return (i >= 1 && i <= argct) ? ap[i - 1] : null; 1496 } 1497 print_menu = 1; 1498 } 1499 } 1500 1501 struct select_menu_info { 1502 char *const *args; 1503 int arg_width; 1504 int num_width; 1505 } info; 1506 1507 static char *select_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); 1508 1509 /* format a single select menu item */ 1510 static char * 1511 select_fmt_entry(arg, i, buf, buflen) 1512 void *arg; 1513 int i; 1514 char *buf; 1515 int buflen; 1516 { 1517 struct select_menu_info *smi = (struct select_menu_info *) arg; 1518 1519 shf_snprintf(buf, buflen, "%*d) %s", 1520 smi->num_width, i + 1, smi->args[i]); 1521 return buf; 1522 } 1523 1524 /* 1525 * print a select style menu 1526 */ 1527 int 1528 pr_menu(ap) 1529 char *const *ap; 1530 { 1531 struct select_menu_info smi; 1532 char *const *pp; 1533 int nwidth, dwidth; 1534 int i, n; 1535 1536 /* Width/column calculations were done once and saved, but this 1537 * means select can't be used recursively so we re-calculate each 1538 * time (could save in a structure that is returned, but its probably 1539 * not worth the bother). 1540 */ 1541 1542 /* 1543 * get dimensions of the list 1544 */ 1545 for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { 1546 i = strlen(*pp); 1547 nwidth = (i > nwidth) ? i : nwidth; 1548 } 1549 /* 1550 * we will print an index of the form 1551 * %d) 1552 * in front of each entry 1553 * get the max width of this 1554 */ 1555 for (i = n, dwidth = 1; i >= 10; i /= 10) 1556 dwidth++; 1557 1558 smi.args = ap; 1559 smi.arg_width = nwidth; 1560 smi.num_width = dwidth; 1561 print_columns(shl_out, n, select_fmt_entry, (void *) &smi, 1562 dwidth + nwidth + 2); 1563 1564 return n; 1565 } 1566 #endif /* KSH */ 1567 #ifdef KSH 1568 1569 /* 1570 * [[ ... ]] evaluation routines 1571 */ 1572 1573 extern const char *const dbtest_tokens[]; 1574 extern const char db_close[]; 1575 1576 /* Test if the current token is a whatever. Accepts the current token if 1577 * it is. Returns 0 if it is not, non-zero if it is (in the case of 1578 * TM_UNOP and TM_BINOP, the returned value is a Test_op). 1579 */ 1580 static int 1581 dbteste_isa(te, meta) 1582 Test_env *te; 1583 Test_meta meta; 1584 { 1585 int ret = 0; 1586 int uqword; 1587 char *p; 1588 1589 if (!*te->pos.wp) 1590 return meta == TM_END; 1591 1592 /* unquoted word? */ 1593 for (p = *te->pos.wp; *p == CHAR; p += 2) 1594 ; 1595 uqword = *p == EOS; 1596 1597 if (meta == TM_UNOP || meta == TM_BINOP) { 1598 if (uqword) { 1599 char buf[8]; /* longer than the longest operator */ 1600 char *q = buf; 1601 for (p = *te->pos.wp; *p == CHAR 1602 && q < &buf[sizeof(buf) - 1]; 1603 p += 2) 1604 *q++ = p[1]; 1605 *q = '\0'; 1606 ret = (int) test_isop(te, meta, buf); 1607 } 1608 } else if (meta == TM_END) 1609 ret = 0; 1610 else 1611 ret = uqword 1612 && strcmp(*te->pos.wp, dbtest_tokens[(int) meta]) == 0; 1613 1614 /* Accept the token? */ 1615 if (ret) 1616 te->pos.wp++; 1617 1618 return ret; 1619 } 1620 1621 static const char * 1622 dbteste_getopnd(te, op, do_eval) 1623 Test_env *te; 1624 Test_op op; 1625 int do_eval; 1626 { 1627 char *s = *te->pos.wp; 1628 1629 if (!s) 1630 return (char *) 0; 1631 1632 te->pos.wp++; 1633 1634 if (!do_eval) 1635 return null; 1636 1637 if (op == TO_STEQL || op == TO_STNEQ) 1638 s = evalstr(s, DOTILDE | DOPAT); 1639 else 1640 s = evalstr(s, DOTILDE); 1641 1642 return s; 1643 } 1644 1645 static int 1646 dbteste_eval(te, op, opnd1, opnd2, do_eval) 1647 Test_env *te; 1648 Test_op op; 1649 const char *opnd1; 1650 const char *opnd2; 1651 int do_eval; 1652 { 1653 return test_eval(te, op, opnd1, opnd2, do_eval); 1654 } 1655 1656 static void 1657 dbteste_error(te, offset, msg) 1658 Test_env *te; 1659 int offset; 1660 const char *msg; 1661 { 1662 te->flags |= TEF_ERROR; 1663 internal_errorf(0, "dbteste_error: %s (offset %d)", msg, offset); 1664 } 1665 #endif /* KSH */ 1666