1/* $NetBSD: exec.c,v 1.14 2011/10/16 17:12:11 joerg Exp $ */ 2 3/* 4 * execute command tree 5 */ 6#include <sys/cdefs.h> 7 8#ifndef lint 9__RCSID("$NetBSD: exec.c,v 1.14 2011/10/16 17:12:11 joerg Exp $"); 10#endif 11 12 13#include "sh.h" 14#include "c_test.h" 15#include <ctype.h> 16#include "ksh_stat.h" 17 18/* Does ps4 get parameter substitutions done? */ 19#ifdef KSH 20# define PS4_SUBSTITUTE(s) substitute((s), 0) 21#else 22# define PS4_SUBSTITUTE(s) (s) 23#endif /* KSH */ 24 25static int comexec ARGS((struct op *, struct tbl *volatile, char **, 26 int volatile)); 27static void scriptexec ARGS((struct op *, char **)); 28static int call_builtin ARGS((struct tbl *, char **)); 29static int iosetup ARGS((struct ioword *, struct tbl *)); 30static int herein ARGS((const char *, int)); 31#ifdef KSH 32static char *do_selectargs ARGS((char **, bool_t)); 33#endif /* KSH */ 34#ifdef KSH 35static int dbteste_isa ARGS((Test_env *, Test_meta)); 36static const char *dbteste_getopnd ARGS((Test_env *, Test_op, int)); 37static int dbteste_eval ARGS((Test_env *, Test_op, const char *, 38 const char *, int)); 39static void dbteste_error ARGS((Test_env *, int, const char *)); 40#endif /* KSH */ 41#ifdef OS2 42static int search_access1 ARGS((const char *, int, int *)); 43#endif /* OS2 */ 44 45 46/* 47 * handle systems that don't have F_SETFD 48 */ 49#ifndef F_SETFD 50# ifndef MAXFD 51# define MAXFD 64 52# endif 53/* a bit field would be smaller, but this will work */ 54static char clexec_tab[MAXFD+1]; 55#endif 56 57/* 58 * we now use this function always. 59 */ 60int 61fd_clexec(fd) 62 int fd; 63{ 64#ifndef F_SETFD 65 if (fd >= 0 && fd < sizeof(clexec_tab)) { 66 clexec_tab[fd] = 1; 67 return 0; 68 } 69 return -1; 70#else 71 return fcntl(fd, F_SETFD, 1); 72#endif 73} 74 75 76/* 77 * execute command tree 78 */ 79int 80execute(t, flags) 81 struct op * volatile t; 82 volatile int flags; /* if XEXEC don't fork */ 83{ 84 int i; 85 volatile int rv = 0; 86 int pv[2]; 87 char ** volatile ap; 88 char *s, *cp; 89 struct ioword **iowp; 90 struct tbl *tp = NULL; 91 92 if (t == NULL) 93 return 0; 94 95 /* Is this the end of a pipeline? If so, we want to evaluate the 96 * command arguments 97 bool_t eval_done = FALSE; 98 if ((flags&XFORK) && !(flags&XEXEC) && (flags&XPCLOSE)) { 99 eval_done = TRUE; 100 tp = eval_execute_args(t, &ap); 101 } 102 */ 103 if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE) 104 return exchild(t, flags & ~XTIME, -1); /* run in sub-process */ 105 106 newenv(E_EXEC); 107 if (trap) 108 runtraps(0); 109 110 if (t->type == TCOM) { 111 /* Clear subst_exstat before argument expansion. Used by 112 * null commands (see comexec() and c_eval()) and by c_set(). 113 */ 114 subst_exstat = 0; 115 116 current_lineno = t->lineno; /* for $LINENO */ 117 118 /* POSIX says expand command words first, then redirections, 119 * and assignments last.. 120 */ 121 ap = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE); 122 if (flags & XTIME) 123 /* Allow option parsing (bizarre, but POSIX) */ 124 timex_hook(t, &ap); 125 if (Flag(FXTRACE) && ap[0]) { 126 shf_fprintf(shl_out, "%s", 127 PS4_SUBSTITUTE(str_val(global("PS4")))); 128 for (i = 0; ap[i]; i++) 129 shf_fprintf(shl_out, "%s%s", ap[i], 130 ap[i + 1] ? space : newline); 131 shf_flush(shl_out); 132 } 133 if (ap[0]) 134 tp = findcom(ap[0], FC_BI|FC_FUNC); 135 } 136 flags &= ~XTIME; 137 138 if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) { 139 e->savefd = (short *) alloc(sizeofN(short, NUFILE), ATEMP); 140 /* initialize to not redirected */ 141 memset(e->savefd, 0, sizeofN(short, NUFILE)); 142 } 143 144 /* do redirection, to be restored in quitenv() */ 145 if (t->ioact != NULL) 146 for (iowp = t->ioact; *iowp != NULL; iowp++) { 147 if (iosetup(*iowp, tp) < 0) { 148 exstat = rv = 1; 149 /* Redirection failures for special commands 150 * cause (non-interactive) shell to exit. 151 */ 152 if (tp && tp->type == CSHELL 153 && (tp->flag & SPEC_BI)) 154 errorf("%s", null); 155 /* Deal with FERREXIT, quitenv(), etc. */ 156 goto Break; 157 } 158 } 159 160 switch(t->type) { 161 case TCOM: 162 rv = comexec(t, tp, ap, flags); 163 break; 164 165 case TPAREN: 166 rv = execute(t->left, flags|XFORK); 167 break; 168 169 case TPIPE: 170 flags |= XFORK; 171 flags &= ~XEXEC; 172 e->savefd[0] = savefd(0, 0); 173 (void) ksh_dup2(e->savefd[0], 0, FALSE); /* stdin of first */ 174 e->savefd[1] = savefd(1, 0); 175 while (t->type == TPIPE) { 176 openpipe(pv); 177 (void) ksh_dup2(pv[1], 1, FALSE); /* stdout of curr */ 178 /* Let exchild() close pv[0] in child 179 * (if this isn't done, commands like 180 * (: ; cat /etc/termcap) | sleep 1 181 * will hang forever). 182 */ 183 exchild(t->left, flags|XPIPEO|XCCLOSE, pv[0]); 184 (void) ksh_dup2(pv[0], 0, FALSE); /* stdin of next */ 185 closepipe(pv); 186 flags |= XPIPEI; 187 t = t->right; 188 } 189 restfd(1, e->savefd[1]); /* stdout of last */ 190 e->savefd[1] = 0; /* no need to re-restore this */ 191 /* Let exchild() close 0 in parent, after fork, before wait */ 192 i = exchild(t, flags|XPCLOSE, 0); 193 if (!(flags&XBGND) && !(flags&XXCOM)) 194 rv = i; 195 break; 196 197 case TLIST: 198 while (t->type == TLIST) { 199 execute(t->left, flags & XERROK); 200 t = t->right; 201 } 202 rv = execute(t, flags & XERROK); 203 break; 204 205#ifdef KSH 206 case TCOPROC: 207 { 208# ifdef JOB_SIGS 209 sigset_t omask; 210# endif /* JOB_SIGS */ 211 212# ifdef JOB_SIGS 213 /* Block sigchild as we are using things changed in the 214 * signal handler 215 */ 216 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 217 e->type = E_ERRH; 218 i = ksh_sigsetjmp(e->jbuf, 0); 219 if (i) { 220 sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); 221 quitenv(); 222 unwind(i); 223 /*NOTREACHED*/ 224 } 225# endif /* JOB_SIGS */ 226 /* Already have a (live) co-process? */ 227 if (coproc.job && coproc.write >= 0) 228 errorf("coprocess already exists"); 229 230 /* Can we re-use the existing co-process pipe? */ 231 coproc_cleanup(TRUE); 232 233 /* do this before opening pipes, in case these fail */ 234 e->savefd[0] = savefd(0, 0); 235 e->savefd[1] = savefd(1, 0); 236 237 openpipe(pv); 238 if (pv[0] != 0) { 239 ksh_dup2(pv[0], 0, FALSE); 240 close(pv[0]); 241 } 242 coproc.write = pv[1]; 243 coproc.job = (void *) 0; 244 245 if (coproc.readw >= 0) 246 ksh_dup2(coproc.readw, 1, FALSE); 247 else { 248 openpipe(pv); 249 coproc.read = pv[0]; 250 ksh_dup2(pv[1], 1, FALSE); 251 coproc.readw = pv[1]; /* closed before first read */ 252 coproc.njobs = 0; 253 /* create new coprocess id */ 254 ++coproc.id; 255 } 256# ifdef JOB_SIGS 257 sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); 258 e->type = E_EXEC; /* no more need for error handler */ 259# endif /* JOB_SIGS */ 260 261 /* exchild() closes coproc.* in child after fork, 262 * will also increment coproc.njobs when the 263 * job is actually created. 264 */ 265 flags &= ~XEXEC; 266 exchild(t->left, flags|XBGND|XFORK|XCOPROC|XCCLOSE, 267 coproc.readw); 268 break; 269 } 270#endif /* KSH */ 271 272 case TASYNC: 273 /* XXX non-optimal, I think - "(foo &)", forks for (), 274 * forks again for async... parent should optimize 275 * this to "foo &"... 276 */ 277 rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK); 278 break; 279 280 case TOR: 281 case TAND: 282 rv = execute(t->left, XERROK); 283 if (t->right != NULL && (rv == 0) == (t->type == TAND)) 284 rv = execute(t->right, flags & XERROK); 285 else 286 flags |= XERROK; 287 break; 288 289 case TBANG: 290 rv = !execute(t->right, XERROK); 291 break; 292 293#ifdef KSH 294 case TDBRACKET: 295 { 296 Test_env te; 297 298 te.flags = TEF_DBRACKET; 299 te.pos.wp = t->args; 300 te.isa = dbteste_isa; 301 te.getopnd = dbteste_getopnd; 302 te.eval = dbteste_eval; 303 te.error = dbteste_error; 304 305 rv = test_parse(&te); 306 break; 307 } 308#endif /* KSH */ 309 310 case TFOR: 311#ifdef KSH 312 case TSELECT: 313 { 314 volatile bool_t is_first = TRUE; 315#endif /* KSH */ 316 ap = (t->vars != NULL) ? 317 eval(t->vars, DOBLANK|DOGLOB|DOTILDE) 318 : e->loc->argv + 1; 319 e->type = E_LOOP; 320 while (1) { 321 i = ksh_sigsetjmp(e->jbuf, 0); 322 if (!i) 323 break; 324 if ((e->flags&EF_BRKCONT_PASS) 325 || (i != LBREAK && i != LCONTIN)) 326 { 327 quitenv(); 328 unwind(i); 329 } else if (i == LBREAK) { 330 rv = 0; 331 goto Break; 332 } 333 } 334 rv = 0; /* in case of a continue */ 335 if (t->type == TFOR) { 336 while (*ap != NULL) { 337 setstr(global(t->str), *ap++, KSH_UNWIND_ERROR); 338 rv = execute(t->left, flags & XERROK); 339 } 340 } 341#ifdef KSH 342 else { /* TSELECT */ 343 for (;;) { 344 if (!(cp = do_selectargs(ap, is_first))) { 345 rv = 1; 346 break; 347 } 348 is_first = FALSE; 349 setstr(global(t->str), cp, KSH_UNWIND_ERROR); 350 rv = execute(t->left, flags & XERROK); 351 } 352 } 353 } 354#endif /* KSH */ 355 break; 356 357 case TWHILE: 358 case TUNTIL: 359 e->type = E_LOOP; 360 while (1) { 361 i = ksh_sigsetjmp(e->jbuf, 0); 362 if (!i) 363 break; 364 if ((e->flags&EF_BRKCONT_PASS) 365 || (i != LBREAK && i != LCONTIN)) 366 { 367 quitenv(); 368 unwind(i); 369 } else if (i == LBREAK) { 370 rv = 0; 371 goto Break; 372 } 373 } 374 rv = 0; /* in case of a continue */ 375 while ((execute(t->left, XERROK) == 0) == (t->type == TWHILE)) 376 rv = execute(t->right, flags & XERROK); 377 break; 378 379 case TIF: 380 case TELIF: 381 if (t->right == NULL) 382 break; /* should be error */ 383 rv = execute(t->left, XERROK) == 0 ? 384 execute(t->right->left, flags & XERROK) : 385 execute(t->right->right, flags & XERROK); 386 break; 387 388 case TCASE: 389 cp = evalstr(t->str, DOTILDE); 390 for (t = t->left; t != NULL && t->type == TPAT; t = t->right) 391 for (ap = t->vars; *ap; ap++) 392 if ((s = evalstr(*ap, DOTILDE|DOPAT)) 393 && gmatch(cp, s, FALSE)) 394 goto Found; 395 break; 396 Found: 397 rv = execute(t->left, flags & XERROK); 398 break; 399 400 case TBRACE: 401 rv = execute(t->left, flags & XERROK); 402 break; 403 404 case TFUNCT: 405 rv = define(t->str, t); 406 break; 407 408 case TTIME: 409 /* Clear XEXEC so nested execute() call doesn't exit 410 * (allows "ls -l | time grep foo"). 411 */ 412 rv = timex(t, flags & ~XEXEC); 413 break; 414 415 case TEXEC: /* an eval'd TCOM */ 416 s = t->args[0]; 417 ap = makenv(); 418#ifndef F_SETFD 419 for (i = 0; i < sizeof(clexec_tab); i++) 420 if (clexec_tab[i]) { 421 close(i); 422 clexec_tab[i] = 0; 423 } 424#endif 425 restoresigs(); 426 cleanup_proc_env(); 427 /* XINTACT bit is for OS2 */ 428 ksh_execve(t->str, t->args, ap, (flags & XINTACT) ? 1 : 0); 429 if (errno == ENOEXEC) 430 scriptexec(t, ap); 431 else 432 errorf("%s: %s", s, strerror(errno)); 433 } 434 Break: 435 exstat = rv; 436 437 quitenv(); /* restores IO */ 438 if ((flags&XEXEC)) 439 unwind(LEXIT); /* exit child */ 440 if (rv != 0 && !(flags & XERROK)) { 441 if (Flag(FERREXIT)) 442 unwind(LERROR); 443 trapsig(SIGERR_); 444 } 445 return rv; 446} 447 448/* 449 * execute simple command 450 */ 451 452static int 453comexec(t, tp, ap, flags) 454 struct op *t; 455 struct tbl *volatile tp; 456 register char **ap; 457 int volatile flags; 458{ 459 int i; 460 volatile int rv = 0; 461 register char *cp; 462 register char **lastp; 463 static struct op texec; /* Must be static (XXX but why?) */ 464 int type_flags; 465 int keepasn_ok; 466 int fcflags = FC_BI|FC_FUNC|FC_PATH; 467 int bourne_function_call = 0; 468 469#ifdef KSH 470 /* snag the last argument for $_ XXX not the same as at&t ksh, 471 * which only seems to set $_ after a newline (but not in 472 * functions/dot scripts, but in interactive and script) - 473 * perhaps save last arg here and set it in shell()?. 474 */ 475 if (Flag(FTALKING) && *(lastp = ap)) { 476 while (*++lastp) 477 ; 478 /* setstr() can't fail here */ 479 setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp, 480 KSH_RETURN_ERROR); 481 } 482#endif /* KSH */ 483 484 /* Deal with the shell builtins builtin, exec and command since 485 * they can be followed by other commands. This must be done before 486 * we know if we should create a local block, which must be done 487 * before we can do a path search (in case the assignments change 488 * PATH). 489 * Odd cases: 490 * FOO=bar exec > /dev/null FOO is kept but not exported 491 * FOO=bar exec foobar FOO is exported 492 * FOO=bar command exec > /dev/null FOO is neither kept nor exported 493 * FOO=bar command FOO is neither kept nor exported 494 * PATH=... foobar use new PATH in foobar search 495 */ 496 keepasn_ok = 1; 497 while (tp && tp->type == CSHELL) { 498 fcflags = FC_BI|FC_FUNC|FC_PATH;/* undo effects of command */ 499 if (tp->val.f == c_builtin) { 500 if ((cp = *++ap) == NULL) { 501 tp = NULL; 502 break; 503 } 504 tp = findcom(cp, FC_BI); 505 if (tp == NULL) 506 errorf("builtin: %s: not a builtin", cp); 507 continue; 508 } else if (tp->val.f == c_exec) { 509 if (ap[1] == NULL) 510 break; 511 ap++; 512 flags |= XEXEC; 513 } else if (tp->val.f == c_command) { 514 int optc, saw_p = 0; 515 516 /* Ugly dealing with options in two places (here and 517 * in c_command(), but such is life) 518 */ 519 ksh_getopt_reset(&builtin_opt, 0); 520 while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) 521 == 'p') 522 saw_p = 1; 523 if (optc != EOF) 524 break; /* command -vV or something */ 525 /* don't look for functions */ 526 fcflags = FC_BI|FC_PATH; 527 if (saw_p) { 528 if (Flag(FRESTRICTED)) { 529 warningf(TRUE, 530 "command -p: restricted"); 531 rv = 1; 532 goto Leave; 533 } 534 fcflags |= FC_DEFPATH; 535 } 536 ap += builtin_opt.optind; 537 /* POSIX says special builtins lose their status 538 * if accessed using command. 539 */ 540 keepasn_ok = 0; 541 if (!ap[0]) { 542 /* ensure command with no args exits with 0 */ 543 subst_exstat = 0; 544 break; 545 } 546 } else 547 break; 548 tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC)); 549 } 550 if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN)))) 551 type_flags = 0; 552 else { 553 /* create new variable/function block */ 554 newblock(); 555 /* ksh functions don't keep assignments, POSIX functions do. */ 556 if (keepasn_ok && tp && tp->type == CFUNC 557 && !(tp->flag & FKSH)) { 558 bourne_function_call = 1; 559 type_flags = 0; 560 } else 561 type_flags = LOCAL|LOCAL_COPY|EXPORT; 562 } 563 if (Flag(FEXPORT)) 564 type_flags |= EXPORT; 565 for (i = 0; t->vars[i]; i++) { 566 cp = evalstr(t->vars[i], DOASNTILDE); 567 if (Flag(FXTRACE)) { 568 if (i == 0) 569 shf_fprintf(shl_out, "%s", 570 PS4_SUBSTITUTE(str_val(global("PS4")))); 571 shf_fprintf(shl_out, "%s%s", cp, 572 t->vars[i + 1] ? space : newline); 573 if (!t->vars[i + 1]) 574 shf_flush(shl_out); 575 } 576 typeset(cp, type_flags, 0, 0, 0); 577 if (bourne_function_call && !(type_flags & EXPORT)) 578 typeset(cp, LOCAL|LOCAL_COPY|EXPORT, 0, 0, 0); 579 } 580 581 if ((cp = *ap) == NULL) { 582 rv = subst_exstat; 583 goto Leave; 584 } else if (!tp) { 585 if (Flag(FRESTRICTED) && ksh_strchr_dirsep(cp)) { 586 warningf(TRUE, "%s: restricted", cp); 587 rv = 1; 588 goto Leave; 589 } 590 tp = findcom(cp, fcflags); 591 } 592 593 switch (tp->type) { 594 case CSHELL: /* shell built-in */ 595 rv = call_builtin(tp, ap); 596 break; 597 598 case CFUNC: /* function call */ 599 { 600 volatile int old_xflag; 601 volatile Tflag old_inuse; 602 const char *volatile old_kshname; 603 604 if (!(tp->flag & ISSET)) { 605 struct tbl *ftp; 606 607 if (!tp->u.fpath) { 608 if (tp->u2.errno_) { 609 warningf(TRUE, 610 "%s: can't find function definition file - %s", 611 cp, strerror(tp->u2.errno_)); 612 rv = 126; 613 } else { 614 warningf(TRUE, 615 "%s: can't find function definition file", cp); 616 rv = 127; 617 } 618 break; 619 } 620 if (include(tp->u.fpath, 0, (char **) 0, 0) < 0) { 621 warningf(TRUE, 622 "%s: can't open function definition file %s - %s", 623 cp, tp->u.fpath, strerror(errno)); 624 rv = 127; 625 break; 626 } 627 if (!(ftp = findfunc(cp, hash(cp), FALSE)) 628 || !(ftp->flag & ISSET)) 629 { 630 warningf(TRUE, 631 "%s: function not defined by %s", 632 cp, tp->u.fpath); 633 rv = 127; 634 break; 635 } 636 tp = ftp; 637 } 638 639 /* ksh functions set $0 to function name, POSIX functions leave 640 * $0 unchanged. 641 */ 642 old_kshname = kshname; 643 if (tp->flag & FKSH) 644 kshname = ap[0]; 645 else 646 ap[0] = (char *) __UNCONST(kshname); 647 e->loc->argv = ap; 648 for (i = 0; *ap++ != NULL; i++) 649 ; 650 e->loc->argc = i - 1; 651 /* ksh-style functions handle getopts sanely, 652 * bourne/posix functions are insane... 653 */ 654 if (tp->flag & FKSH) { 655 e->loc->flags |= BF_DOGETOPTS; 656 e->loc->getopts_state = user_opt; 657 getopts_reset(1); 658 } 659 660 old_xflag = Flag(FXTRACE); 661 Flag(FXTRACE) = tp->flag & TRACE ? TRUE : FALSE; 662 663 old_inuse = tp->flag & FINUSE; 664 tp->flag |= FINUSE; 665 666 e->type = E_FUNC; 667 i = ksh_sigsetjmp(e->jbuf, 0); 668 if (i == 0) { 669 /* seems odd to pass XERROK here, but at&t ksh does */ 670 exstat = execute(tp->val.t, flags & XERROK); 671 i = LRETURN; 672 } 673 kshname = old_kshname; 674 Flag(FXTRACE) = old_xflag; 675 tp->flag = (tp->flag & ~FINUSE) | old_inuse; 676 /* Were we deleted while executing? If so, free the execution 677 * tree. todo: Unfortunately, the table entry is never re-used 678 * until the lookup table is expanded. 679 */ 680 if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) { 681 if (tp->flag & ALLOC) { 682 tp->flag &= ~ALLOC; 683 tfree(tp->val.t, tp->areap); 684 } 685 tp->flag = 0; 686 } 687 switch (i) { 688 case LRETURN: 689 case LERROR: 690 rv = exstat; 691 break; 692 case LINTR: 693 case LEXIT: 694 case LLEAVE: 695 case LSHELL: 696 quitenv(); 697 unwind(i); 698 /*NOTREACHED*/ 699 default: 700 quitenv(); 701 internal_errorf(1, "CFUNC %d", i); 702 } 703 break; 704 } 705 706 case CEXEC: /* executable command */ 707 case CTALIAS: /* tracked alias */ 708 if (!(tp->flag&ISSET)) { 709 /* errno_ will be set if the named command was found 710 * but could not be executed (permissions, no execute 711 * bit, directory, etc). Print out a (hopefully) 712 * useful error message and set the exit status to 126. 713 */ 714 if (tp->u2.errno_) { 715 warningf(TRUE, "%s: cannot execute - %s", cp, 716 strerror(tp->u2.errno_)); 717 rv = 126; /* POSIX */ 718 } else { 719 warningf(TRUE, "%s: not found", cp); 720 rv = 127; 721 } 722 break; 723 } 724 725#ifdef KSH 726 /* set $_ to program's full path */ 727 /* setstr() can't fail here */ 728 setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0), 729 tp->val.s, KSH_RETURN_ERROR); 730#endif /* KSH */ 731 732 if (flags&XEXEC) { 733 j_exit(); 734 if (!(flags&XBGND) || Flag(FMONITOR)) { 735 setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG); 736 setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG); 737 } 738 } 739 740 /* to fork we set up a TEXEC node and call execute */ 741 texec.type = TEXEC; 742 texec.left = t; /* for tprint */ 743 texec.str = tp->val.s; 744 texec.args = ap; 745 rv = exchild(&texec, flags, -1); 746 break; 747 } 748 Leave: 749 if (flags & XEXEC) { 750 exstat = rv; 751 unwind(LLEAVE); 752 } 753 return rv; 754} 755 756static void 757scriptexec(tp, ap) 758 register struct op *tp; 759 register char **ap; 760{ 761 char *shellv; 762 763 shellv = str_val(global(EXECSHELL_STR)); 764 if (shellv && *shellv) 765 shellv = search(shellv, path, X_OK, (int *) 0); 766 if (!shellv || !*shellv) 767 shellv = __UNCONST(EXECSHELL); 768 769 *tp->args-- = tp->str; 770#ifdef SHARPBANG 771 { 772 char buf[LINE]; 773 register char *cp; 774 register int fd, n; 775 776 buf[0] = '\0'; 777 if ((fd = open(tp->str, O_RDONLY)) >= 0) { 778 if ((n = read(fd, buf, LINE - 1)) > 0) 779 buf[n] = '\0'; 780 (void) close(fd); 781 } 782 if ((buf[0] == '#' && buf[1] == '!' && (cp = &buf[2])) 783# ifdef OS2 784 || (strncmp(buf, "extproc", 7) == 0 && isspace((unsigned char)buf[7]) 785 && (cp = &buf[7])) 786# endif /* OS2 */ 787 ) 788 { 789 while (*cp && (*cp == ' ' || *cp == '\t')) 790 cp++; 791 if (*cp && *cp != '\n') { 792 char *a0 = cp, *a1 = (char *) 0; 793# ifdef OS2 794 char *a2 = cp; 795# endif /* OS2 */ 796 797 while (*cp && *cp != '\n' && *cp != ' ' 798 && *cp != '\t') 799 { 800# ifdef OS2 801 /* Allow shell search without prepended path 802 * if shell with / in pathname cannot be found. 803 * Use / explicitly so \ can be used if explicit 804 * needs to be forced. 805 */ 806 if (*cp == '/') 807 a2 = cp + 1; 808# endif /* OS2 */ 809 cp++; 810 } 811 if (*cp && *cp != '\n') { 812 *cp++ = '\0'; 813 while (*cp 814 && (*cp == ' ' || *cp == '\t')) 815 cp++; 816 if (*cp && *cp != '\n') { 817 a1 = cp; 818 /* all one argument */ 819 while (*cp && *cp != '\n') 820 cp++; 821 } 822 } 823 if (*cp == '\n') { 824 *cp = '\0'; 825 if (a1) 826 *tp->args-- = a1; 827# ifdef OS2 828 if (a0 != a2) { 829 char *tmp_a0 = str_nsave(a0, 830 strlen(a0) + 5, ATEMP); 831 if (search_access(tmp_a0, X_OK, 832 (int *) 0)) 833 a0 = a2; 834 afree(tmp_a0, ATEMP); 835 } 836# endif /* OS2 */ 837 shellv = a0; 838 } 839 } 840# ifdef OS2 841 } else { 842 /* Use ksh documented shell default if present 843 * else use OS2_SHELL which is assumed to need 844 * the /c option and '\' as dir separator. 845 */ 846 char *p = shellv; 847 848 shellv = str_val(global("EXECSHELL")); 849 if (shellv && *shellv) 850 shellv = search(shellv, path, X_OK, (int *) 0); 851 if (!shellv || !*shellv) { 852 shellv = p; 853 *tp->args-- = "/c"; 854 for (p = tp->str; *p; p++) 855 if (*p == '/') 856 *p = '\\'; 857 } 858# endif /* OS2 */ 859 } 860 } 861#endif /* SHARPBANG */ 862 *tp->args = shellv; 863 864 ksh_execve(tp->args[0], tp->args, ap, 0); 865 866 /* report both the program that was run and the bogus shell */ 867 errorf("%s: %s: %s", tp->str, shellv, strerror(errno)); 868} 869 870int 871shcomexec(wp) 872 register char **wp; 873{ 874 register struct tbl *tp; 875 876 tp = tsearch(&builtins, *wp, hash(*wp)); 877 if (tp == NULL) 878 internal_errorf(1, "shcomexec: %s", *wp); 879 return call_builtin(tp, wp); 880} 881 882/* 883 * Search function tables for a function. If create set, a table entry 884 * is created if none is found. 885 */ 886struct tbl * 887findfunc(name, h, create) 888 const char *name; 889 unsigned int h; 890 int create; 891{ 892 struct block *l; 893 struct tbl *tp = (struct tbl *) 0; 894 895 for (l = e->loc; l; l = l->next) { 896 tp = tsearch(&l->funs, name, h); 897 if (tp) 898 break; 899 if (!l->next && create) { 900 tp = tenter(&l->funs, name, h); 901 tp->flag = DEFINED; 902 tp->type = CFUNC; 903 tp->val.t = (struct op *) 0; 904 break; 905 } 906 } 907 return tp; 908} 909 910/* 911 * define function. Returns 1 if function is being undefined (t == 0) and 912 * function did not exist, returns 0 otherwise. 913 */ 914int 915define(name, t) 916 const char *name; 917 struct op *t; 918{ 919 struct tbl *tp; 920 int was_set = 0; 921 922 while (1) { 923 tp = findfunc(name, hash(name), TRUE); 924 925 if (tp->flag & ISSET) 926 was_set = 1; 927 /* If this function is currently being executed, we zap this 928 * table entry so findfunc() won't see it 929 */ 930 if (tp->flag & FINUSE) { 931 tp->name[0] = '\0'; 932 tp->flag &= ~DEFINED; /* ensure it won't be found */ 933 tp->flag |= FDELETE; 934 } else 935 break; 936 } 937 938 if (tp->flag & ALLOC) { 939 tp->flag &= ~(ISSET|ALLOC); 940 tfree(tp->val.t, tp->areap); 941 } 942 943 if (t == NULL) { /* undefine */ 944 tdelete(tp); 945 return was_set ? 0 : 1; 946 } 947 948 tp->val.t = tcopy(t->left, tp->areap); 949 tp->flag |= (ISSET|ALLOC); 950 if (t->u.ksh_func) 951 tp->flag |= FKSH; 952 953 return 0; 954} 955 956/* 957 * add builtin 958 */ 959void 960builtin(name, func) 961 const char *name; 962 int (*func) ARGS((char **)); 963{ 964 register struct tbl *tp; 965 Tflag flag; 966 967 /* see if any flags should be set for this builtin */ 968 for (flag = 0; ; name++) { 969 if (*name == '=') /* command does variable assignment */ 970 flag |= KEEPASN; 971 else if (*name == '*') /* POSIX special builtin */ 972 flag |= SPEC_BI; 973 else if (*name == '+') /* POSIX regular builtin */ 974 flag |= REG_BI; 975 else 976 break; 977 } 978 979 tp = tenter(&builtins, name, hash(name)); 980 tp->flag = DEFINED | flag; 981 tp->type = CSHELL; 982 tp->val.f = func; 983} 984 985/* 986 * find command 987 * either function, hashed command, or built-in (in that order) 988 */ 989struct tbl * 990findcom(name, flags) 991 const char *name; 992 int flags; /* FC_* */ 993{ 994 static struct tbl temp; 995 unsigned int h = hash(name); 996 struct tbl *tp = NULL, *tbi; 997 int insert = Flag(FTRACKALL); /* insert if not found */ 998 char *fpath; /* for function autoloading */ 999 char *npath; 1000 1001 if (ksh_strchr_dirsep(name) != NULL) { 1002 insert = 0; 1003 /* prevent FPATH search below */ 1004 flags &= ~FC_FUNC; 1005 goto Search; 1006 } 1007 tbi = (flags & FC_BI) ? tsearch(&builtins, name, h) : NULL; 1008 /* POSIX says special builtins first, then functions, then 1009 * POSIX regular builtins, then search path... 1010 */ 1011 if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI)) 1012 tp = tbi; 1013 if (!tp && (flags & FC_FUNC)) { 1014 tp = findfunc(name, h, FALSE); 1015 if (tp && !(tp->flag & ISSET)) { 1016 if ((fpath = str_val(global("FPATH"))) == null) { 1017 tp->u.fpath = (char *) 0; 1018 tp->u2.errno_ = 0; 1019 } else 1020 tp->u.fpath = search(name, fpath, R_OK, 1021 &tp->u2.errno_); 1022 } 1023 } 1024 if (!tp && (flags & FC_REGBI) && tbi && (tbi->flag & REG_BI)) 1025 tp = tbi; 1026 /* todo: posix says non-special/non-regular builtins must 1027 * be triggered by some user-controllable means like a 1028 * special directory in PATH. Requires modifications to 1029 * the search() function. Tracked aliases should be 1030 * modified to allow tracking of builtin commands. 1031 * This should be under control of the FPOSIX flag. 1032 * If this is changed, also change c_whence... 1033 */ 1034 if (!tp && (flags & FC_UNREGBI) && tbi) 1035 tp = tbi; 1036 if (!tp && (flags & FC_PATH) && !(flags & FC_DEFPATH)) { 1037 tp = tsearch(&taliases, name, h); 1038 if (tp && (tp->flag & ISSET) && eaccess(tp->val.s, X_OK) != 0) { 1039 if (tp->flag & ALLOC) { 1040 tp->flag &= ~ALLOC; 1041 afree(tp->val.s, APERM); 1042 } 1043 tp->flag &= ~ISSET; 1044 } 1045 } 1046 1047 Search: 1048 if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) 1049 && (flags & FC_PATH)) 1050 { 1051 if (!tp) { 1052 if (insert && !(flags & FC_DEFPATH)) { 1053 tp = tenter(&taliases, name, h); 1054 tp->type = CTALIAS; 1055 } else { 1056 tp = &temp; 1057 tp->type = CEXEC; 1058 } 1059 tp->flag = DEFINED; /* make ~ISSET */ 1060 } 1061 npath = search(name, flags & FC_DEFPATH ? def_path : path, 1062 X_OK, &tp->u2.errno_); 1063 if (npath) { 1064 if (tp == &temp) { 1065 tp->val.s = npath; 1066 } else { 1067 tp->val.s = str_save(npath, APERM); 1068 afree(npath, ATEMP); 1069 } 1070 tp->flag |= ISSET|ALLOC; 1071 } else if ((flags & FC_FUNC) 1072 && (fpath = str_val(global("FPATH"))) != null 1073 && (npath = search(name, fpath, R_OK, 1074 &tp->u2.errno_)) != (char *) 0) 1075 { 1076 /* An undocumented feature of at&t ksh is that it 1077 * searches FPATH if a command is not found, even 1078 * if the command hasn't been set up as an autoloaded 1079 * function (ie, no typeset -uf). 1080 */ 1081 tp = &temp; 1082 tp->type = CFUNC; 1083 tp->flag = DEFINED; /* make ~ISSET */ 1084 tp->u.fpath = npath; 1085 } 1086 } 1087 return tp; 1088} 1089 1090/* 1091 * flush executable commands with relative paths 1092 */ 1093void 1094flushcom(all) 1095 int all; /* just relative or all */ 1096{ 1097 struct tbl *tp; 1098 struct tstate ts; 1099 1100 for (twalk(&ts, &taliases); (tp = tnext(&ts)) != NULL; ) 1101 if ((tp->flag&ISSET) && (all || !ISDIRSEP(tp->val.s[0]))) { 1102 if (tp->flag&ALLOC) { 1103 tp->flag &= ~(ALLOC|ISSET); 1104 afree(tp->val.s, APERM); 1105 } 1106 tp->flag &= ~ISSET; 1107 } 1108} 1109 1110/* Check if path is something we want to find. Returns -1 for failure. */ 1111int 1112search_access(pathx, mode, errnop) 1113 const char *pathx; 1114 int mode; 1115 int *errnop; /* set if candidate found, but not suitable */ 1116{ 1117#ifndef OS2 1118 int ret, err = 0; 1119 struct stat statb; 1120 1121 if (stat(pathx, &statb) < 0) 1122 return -1; 1123 ret = eaccess(pathx, mode); 1124 if (ret < 0) 1125 err = errno; /* File exists, but we can't access it */ 1126 else if (mode == X_OK 1127 && (!S_ISREG(statb.st_mode) 1128 /* This 'cause access() says root can execute everything */ 1129 || !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))) 1130 { 1131 ret = -1; 1132 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1133 } 1134 if (err && errnop && !*errnop) 1135 *errnop = err; 1136 return ret; 1137#else /* !OS2 */ 1138 /* 1139 * NOTE: ASSUMES path can be modified and has enough room at the 1140 * end of the string for a suffix (ie, 4 extra characters). 1141 * Certain code knows this (eg, eval.c(globit()), 1142 * exec.c(search())). 1143 */ 1144 static char *xsuffixes[] = { ".ksh", ".exe", ".", ".sh", ".cmd", 1145 ".com", ".bat", (char *) 0 1146 }; 1147 static char *rsuffixes[] = { ".ksh", ".", ".sh", ".cmd", ".bat", 1148 (char *) 0 1149 }; 1150 int i; 1151 char *mpath = (char *) pathx; 1152 char *tp = mpath + strlen(mpath); 1153 char *p; 1154 char **sfx; 1155 1156 /* If a suffix has been specified, check if it is one of the 1157 * suffixes that indicate the file is executable - if so, change 1158 * the access test to R_OK... 1159 * This code assumes OS/2 files can have only one suffix... 1160 */ 1161 if ((p = strrchr((p = ksh_strrchr_dirsep(mpath)) ? p : mpath, '.'))) { 1162 if (mode == X_OK) 1163 mode = R_OK; 1164 return search_access1(mpath, mode, errnop); 1165 } 1166 /* Try appending the various suffixes. Different suffixes for 1167 * read and execute 'cause we don't want to read an executable... 1168 */ 1169 sfx = mode == R_OK ? rsuffixes : xsuffixes; 1170 for (i = 0; sfx[i]; i++) { 1171 strcpy(tp, p = sfx[i]); 1172 if (search_access1(mpath, R_OK, errnop) == 0) 1173 return 0; 1174 *tp = '\0'; 1175 } 1176 return -1; 1177#endif /* !OS2 */ 1178} 1179 1180#ifdef OS2 1181static int 1182search_access1(pathx, mode, errnop) 1183 const char *pathx; 1184 int mode; 1185 int *errnop; /* set if candidate found, but not suitable */ 1186{ 1187 int ret, err = 0; 1188 struct stat statb; 1189 1190 if (stat(pathx, &statb) < 0) 1191 return -1; 1192 ret = eaccess(pathx, mode); 1193 if (ret < 0) 1194 err = errno; /* File exists, but we can't access it */ 1195 else if (!S_ISREG(statb.st_mode)) { 1196 ret = -1; 1197 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1198 } 1199 if (err && errnop && !*errnop) 1200 *errnop = err; 1201 return ret; 1202} 1203#endif /* OS2 */ 1204 1205/* 1206 * search for command with PATH 1207 */ 1208char * 1209search(name, pathx, mode, errnop) 1210 const char *name; 1211 const char *pathx; 1212 int mode; /* R_OK or X_OK */ 1213 int *errnop; /* set if candidate found, but not suitable */ 1214{ 1215 const char *sp, *p; 1216 char *xp; 1217 XString xs; 1218 int namelen; 1219 1220 if (errnop) 1221 *errnop = 0; 1222#ifdef OS2 1223 /* Xinit() allocates 8 additional bytes, so appended suffixes won't 1224 * overflow the memory. 1225 */ 1226 namelen = strlen(name) + 1; 1227 Xinit(xs, xp, namelen, ATEMP); 1228 memcpy(Xstring(xs, xp), name, namelen); 1229 1230 if (ksh_strchr_dirsep(name)) { 1231 if (search_access(Xstring(xs, xp), mode, errnop) >= 0) 1232 return Xstring(xs, xp); /* not Xclose() - see above */ 1233 Xfree(xs, xp); 1234 return NULL; 1235 } 1236 1237 /* Look in current context always. (os2 style) */ 1238 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1239 return Xstring(xs, xp); /* not Xclose() - xp may be wrong */ 1240#else /* OS2 */ 1241 if (ksh_strchr_dirsep(name)) { 1242 if (search_access(name, mode, errnop) == 0) 1243 return (char *)__UNCONST(name); 1244 return NULL; 1245 } 1246 1247 namelen = strlen(name) + 1; 1248 Xinit(xs, xp, 128, ATEMP); 1249#endif /* OS2 */ 1250 1251 sp = pathx; 1252 while (sp != NULL) { 1253 xp = Xstring(xs, xp); 1254 if (!(p = strchr(sp, PATHSEP))) 1255 p = sp + strlen(sp); 1256 if (p != sp) { 1257 XcheckN(xs, xp, p - sp); 1258 memcpy(xp, sp, p - sp); 1259 xp += p - sp; 1260 *xp++ = DIRSEP; 1261 } 1262 sp = p; 1263 XcheckN(xs, xp, namelen); 1264 memcpy(xp, name, namelen); 1265 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1266#ifdef OS2 1267 return Xstring(xs, xp); /* Not Xclose() - see above */ 1268#else /* OS2 */ 1269 return Xclose(xs, xp + namelen); 1270#endif /* OS2 */ 1271 if (*sp++ == '\0') 1272 sp = NULL; 1273 } 1274 Xfree(xs, xp); 1275 return NULL; 1276} 1277 1278static int 1279call_builtin(tp, wp) 1280 struct tbl *tp; 1281 char **wp; 1282{ 1283 int rv; 1284 1285 builtin_argv0 = wp[0]; 1286 builtin_flag = tp->flag; 1287 shf_reopen(1, SHF_WR, shl_stdout); 1288 shl_stdout_ok = 1; 1289 ksh_getopt_reset(&builtin_opt, GF_ERROR); 1290 rv = (*tp->val.f)(wp); 1291 shf_flush(shl_stdout); 1292 shl_stdout_ok = 0; 1293 builtin_flag = 0; 1294 builtin_argv0 = (char *) 0; 1295 return rv; 1296} 1297 1298/* 1299 * set up redirection, saving old fd's in e->savefd 1300 */ 1301static int 1302iosetup(iop, tp) 1303 register struct ioword *iop; 1304 struct tbl *tp; 1305{ 1306 register int u = -1; 1307 char *cp = iop->name; 1308 int iotype = iop->flag & IOTYPE; 1309 int do_open = 1, do_close = 0, UNINITIALIZED(flags); 1310 struct ioword iotmp; 1311 struct stat statb; 1312 1313 if (iotype != IOHERE) 1314 cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0)); 1315 1316 /* Used for tracing and error messages to print expanded cp */ 1317 iotmp = *iop; 1318 iotmp.name = (iotype == IOHERE) ? (char *) 0 : cp; 1319 iotmp.flag |= IONAMEXP; 1320 1321 if (Flag(FXTRACE)) 1322 shellf("%s%s\n", 1323 PS4_SUBSTITUTE(str_val(global("PS4"))), 1324 snptreef((char *) 0, 32, "%R", &iotmp)); 1325 1326 switch (iotype) { 1327 case IOREAD: 1328 flags = O_RDONLY; 1329 break; 1330 1331 case IOCAT: 1332 flags = O_WRONLY | O_APPEND | O_CREAT; 1333 break; 1334 1335 case IOWRITE: 1336 flags = O_WRONLY | O_CREAT | O_TRUNC; 1337 /* The stat() is here to allow redirections to 1338 * things like /dev/null without error. 1339 */ 1340 if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) 1341 && (stat(cp, &statb) < 0 || S_ISREG(statb.st_mode))) 1342 flags |= O_EXCL; 1343 break; 1344 1345 case IORDWR: 1346 flags = O_RDWR | O_CREAT; 1347 break; 1348 1349 case IOHERE: 1350 do_open = 0; 1351 /* herein() returns -2 if error has been printed */ 1352 u = herein(iop->heredoc, iop->flag & IOEVAL); 1353 /* cp may have wrong name */ 1354 break; 1355 1356 case IODUP: 1357 { 1358 const char *emsg; 1359 1360 do_open = 0; 1361 if (*cp == '-' && !cp[1]) { 1362 u = 1009; /* prevent error return below */ 1363 do_close = 1; 1364 } else if ((u = check_fd(cp, 1365 X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK), 1366 &emsg)) < 0) 1367 { 1368 warningf(TRUE, "%s: %s", 1369 snptreef((char *) 0, 32, "%R", &iotmp), emsg); 1370 return -1; 1371 } 1372 if (u == iop->unit) 1373 return 0; /* "dup from" == "dup to" */ 1374 break; 1375 } 1376 } 1377 if (do_open) { 1378 if (Flag(FRESTRICTED) && (flags & O_CREAT)) { 1379 warningf(TRUE, "%s: restricted", cp); 1380 return -1; 1381 } 1382 u = open(cp, flags, 0666); 1383#ifdef OS2 1384 if (u < 0 && strcmp(cp, "/dev/null") == 0) 1385 u = open("nul", flags, 0666); 1386#endif /* OS2 */ 1387 } 1388 if (u < 0) { 1389 /* herein() may already have printed message */ 1390 if (u == -1) 1391 warningf(TRUE, "cannot %s %s: %s", 1392 iotype == IODUP ? "dup" 1393 : (iotype == IOREAD || iotype == IOHERE) ? 1394 "open" : "create", cp, strerror(errno)); 1395 return -1; 1396 } 1397 /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ 1398 if (e->savefd[iop->unit] == 0) { 1399 /* If these are the same, it means unit was previously closed */ 1400 if (u == iop->unit) 1401 e->savefd[iop->unit] = -1; 1402 else 1403 /* c_exec() assumes e->savefd[fd] set for any 1404 * redirections. Ask savefd() not to close iop->unit; 1405 * this allows error messages to be seen if iop->unit 1406 * is 2; also means we can't lose the fd (eg, both 1407 * dup2 below and dup2 in restfd() failing). 1408 */ 1409 e->savefd[iop->unit] = savefd(iop->unit, 1); 1410 } 1411 1412 if (do_close) 1413 close(iop->unit); 1414 else if (u != iop->unit) { 1415 if (ksh_dup2(u, iop->unit, TRUE) < 0) { 1416 warningf(TRUE, 1417 "could not finish (dup) redirection %s: %s", 1418 snptreef((char *) 0, 32, "%R", &iotmp), 1419 strerror(errno)); 1420 if (iotype != IODUP) 1421 close(u); 1422 return -1; 1423 } 1424 if (iotype != IODUP) 1425 close(u); 1426#ifdef KSH 1427 /* Touching any co-process fd in an empty exec 1428 * causes the shell to close its copies 1429 */ 1430 else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { 1431 if (iop->flag & IORDUP) /* possible exec <&p */ 1432 coproc_read_close(u); 1433 else /* possible exec >&p */ 1434 coproc_write_close(u); 1435 } 1436#endif /* KSH */ 1437 } 1438 if (u == 2) /* Clear any write errors */ 1439 shf_reopen(2, SHF_WR, shl_out); 1440 return 0; 1441} 1442 1443/* 1444 * open here document temp file. 1445 * if unquoted here, expand here temp file into second temp file. 1446 */ 1447static int 1448herein(content, sub) 1449 const char *content; 1450 int sub; 1451{ 1452 volatile int fd = -1; 1453 struct source *s, *volatile osource; 1454 struct shf *volatile shf; 1455 struct temp *h; 1456 int i; 1457 1458 /* ksh -c 'cat << EOF' can cause this... */ 1459 if (content == (char *) 0) { 1460 warningf(TRUE, "here document missing"); 1461 return -2; /* special to iosetup(): don't print error */ 1462 } 1463 1464 /* Create temp file to hold content (done before newenv so temp 1465 * doesn't get removed too soon). 1466 */ 1467 h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps); 1468 if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) { 1469 warningf(TRUE, "can't %s temporary file %s: %s", 1470 !shf ? "create" : "open", 1471 h->name, strerror(errno)); 1472 if (shf) 1473 shf_close(shf); 1474 return -2 /* special to iosetup(): don't print error */; 1475 } 1476 1477 osource = source; 1478 newenv(E_ERRH); 1479 i = ksh_sigsetjmp(e->jbuf, 0); 1480 if (i) { 1481 source = osource; 1482 quitenv(); 1483 shf_close(shf); /* after quitenv */ 1484 close(fd); 1485 return -2; /* special to iosetup(): don't print error */ 1486 } 1487 if (sub) { 1488 /* Do substitutions on the content of heredoc */ 1489 s = pushs(SSTRING, ATEMP); 1490 s->start = s->str = content; 1491 source = s; 1492 if (yylex(ONEWORD|HEREDOC) != LWORD) 1493 internal_errorf(1, "herein: yylex"); 1494 source = osource; 1495 shf_puts(evalstr(yylval.cp, 0), shf); 1496 } else 1497 shf_puts(content, shf); 1498 1499 quitenv(); 1500 1501 if (shf_close(shf) == EOF) { 1502 close(fd); 1503 warningf(TRUE, "error writing %s: %s", h->name, 1504 strerror(errno)); 1505 return -2; /* special to iosetup(): don't print error */ 1506 } 1507 1508 return fd; 1509} 1510 1511#ifdef KSH 1512/* 1513 * ksh special - the select command processing section 1514 * print the args in column form - assuming that we can 1515 */ 1516static char * 1517do_selectargs(ap, print_menu) 1518 register char **ap; 1519 bool_t print_menu; 1520{ 1521 static const char *const read_args[] = { 1522 "read", "-r", "REPLY", (char *) 0 1523 }; 1524 char *s; 1525 int i, argct; 1526 1527 for (argct = 0; ap[argct]; argct++) 1528 ; 1529 while (1) { 1530 /* Menu is printed if 1531 * - this is the first time around the select loop 1532 * - the user enters a blank line 1533 * - the REPLY parameter is empty 1534 */ 1535 if (print_menu || !*str_val(global("REPLY"))) 1536 pr_menu(ap); 1537 shellf("%s", str_val(global("PS3"))); 1538 if (call_builtin(findcom("read", FC_BI), 1539 (char **) __UNCONST(read_args))) 1540 return (char *) 0; 1541 s = str_val(global("REPLY")); 1542 if (*s) { 1543 i = atoi(s); 1544 return (i >= 1 && i <= argct) ? ap[i - 1] : null; 1545 } 1546 print_menu = 1; 1547 } 1548} 1549 1550struct select_menu_info { 1551 char *const *args; 1552 int arg_width; 1553 int num_width; 1554} info; 1555 1556static char *select_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); 1557 1558/* format a single select menu item */ 1559static char * 1560select_fmt_entry(arg, i, buf, buflen) 1561 void *arg; 1562 int i; 1563 char *buf; 1564 int buflen; 1565{ 1566 struct select_menu_info *smi = (struct select_menu_info *) arg; 1567 1568 shf_snprintf(buf, buflen, "%*d) %s", 1569 smi->num_width, i + 1, smi->args[i]); 1570 return buf; 1571} 1572 1573/* 1574 * print a select style menu 1575 */ 1576int 1577pr_menu(ap) 1578 char *const *ap; 1579{ 1580 struct select_menu_info smi; 1581 char *const *pp; 1582 int nwidth, dwidth; 1583 int i, n; 1584 1585 /* Width/column calculations were done once and saved, but this 1586 * means select can't be used recursively so we re-calculate each 1587 * time (could save in a structure that is returned, but its probably 1588 * not worth the bother). 1589 */ 1590 1591 /* 1592 * get dimensions of the list 1593 */ 1594 for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { 1595 i = strlen(*pp); 1596 nwidth = (i > nwidth) ? i : nwidth; 1597 } 1598 /* 1599 * we will print an index of the form 1600 * %d) 1601 * in front of each entry 1602 * get the max width of this 1603 */ 1604 for (i = n, dwidth = 1; i >= 10; i /= 10) 1605 dwidth++; 1606 1607 smi.args = ap; 1608 smi.arg_width = nwidth; 1609 smi.num_width = dwidth; 1610 print_columns(shl_out, n, select_fmt_entry, (void *) &smi, 1611 dwidth + nwidth + 2, 1); 1612 1613 return n; 1614} 1615 1616/* XXX: horrible kludge to fit within the framework */ 1617 1618static char *plain_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); 1619 1620static char * 1621plain_fmt_entry(arg, i, buf, buflen) 1622 void *arg; 1623 int i; 1624 char *buf; 1625 int buflen; 1626{ 1627 shf_snprintf(buf, buflen, "%s", ((char *const *)arg)[i]); 1628 return buf; 1629} 1630 1631int 1632pr_list(ap) 1633 char *const *ap; 1634{ 1635 char *const *pp; 1636 int nwidth; 1637 int i, n; 1638 1639 for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { 1640 i = strlen(*pp); 1641 nwidth = (i > nwidth) ? i : nwidth; 1642 } 1643 print_columns(shl_out, n, plain_fmt_entry, (void *)__UNCONST(ap), 1644 nwidth + 1, 0); 1645 1646 return n; 1647} 1648#endif /* KSH */ 1649#ifdef KSH 1650 1651/* 1652 * [[ ... ]] evaluation routines 1653 */ 1654 1655extern const char *const dbtest_tokens[]; 1656extern const char db_close[]; 1657 1658/* Test if the current token is a whatever. Accepts the current token if 1659 * it is. Returns 0 if it is not, non-zero if it is (in the case of 1660 * TM_UNOP and TM_BINOP, the returned value is a Test_op). 1661 */ 1662static int 1663dbteste_isa(te, meta) 1664 Test_env *te; 1665 Test_meta meta; 1666{ 1667 int ret = 0; 1668 int uqword; 1669 char *p; 1670 1671 if (!*te->pos.wp) 1672 return meta == TM_END; 1673 1674 /* unquoted word? */ 1675 for (p = *te->pos.wp; *p == CHAR; p += 2) 1676 ; 1677 uqword = *p == EOS; 1678 1679 if (meta == TM_UNOP || meta == TM_BINOP) { 1680 if (uqword) { 1681 char buf[8]; /* longer than the longest operator */ 1682 char *q = buf; 1683 for (p = *te->pos.wp; *p == CHAR 1684 && q < &buf[sizeof(buf) - 1]; 1685 p += 2) 1686 *q++ = p[1]; 1687 *q = '\0'; 1688 ret = (int) test_isop(te, meta, buf); 1689 } 1690 } else if (meta == TM_END) 1691 ret = 0; 1692 else 1693 ret = uqword 1694 && strcmp(*te->pos.wp, dbtest_tokens[(int) meta]) == 0; 1695 1696 /* Accept the token? */ 1697 if (ret) 1698 te->pos.wp++; 1699 1700 return ret; 1701} 1702 1703static const char * 1704dbteste_getopnd(te, op, do_eval) 1705 Test_env *te; 1706 Test_op op; 1707 int do_eval; 1708{ 1709 char *s = *te->pos.wp; 1710 1711 if (!s) 1712 return (char *) 0; 1713 1714 te->pos.wp++; 1715 1716 if (!do_eval) 1717 return null; 1718 1719 if (op == TO_STEQL || op == TO_STNEQ) 1720 s = evalstr(s, DOTILDE | DOPAT); 1721 else 1722 s = evalstr(s, DOTILDE); 1723 1724 return s; 1725} 1726 1727static int 1728dbteste_eval(te, op, opnd1, opnd2, do_eval) 1729 Test_env *te; 1730 Test_op op; 1731 const char *opnd1; 1732 const char *opnd2; 1733 int do_eval; 1734{ 1735 return test_eval(te, op, opnd1, opnd2, do_eval); 1736} 1737 1738static void 1739dbteste_error(te, offset, msg) 1740 Test_env *te; 1741 int offset; 1742 const char *msg; 1743{ 1744 te->flags |= TEF_ERROR; 1745 internal_errorf(0, "dbteste_error: %s (offset %d)", msg, offset); 1746} 1747#endif /* KSH */ 1748