1 /* $NetBSD: exec.c,v 1.12 2005/09/11 22:16:00 christos Exp $ */ 2 3 /* 4 * execute command tree 5 */ 6 #include <sys/cdefs.h> 7 8 #ifndef lint 9 __RCSID("$NetBSD: exec.c,v 1.12 2005/09/11 22:16:00 christos 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 25 static int comexec ARGS((struct op *, struct tbl *volatile, char **, 26 int volatile)); 27 static void scriptexec ARGS((struct op *, char **)); 28 static int call_builtin ARGS((struct tbl *, char **)); 29 static int iosetup ARGS((struct ioword *, struct tbl *)); 30 static int herein ARGS((const char *, int)); 31 #ifdef KSH 32 static char *do_selectargs ARGS((char **, bool_t)); 33 #endif /* KSH */ 34 #ifdef KSH 35 static int dbteste_isa ARGS((Test_env *, Test_meta)); 36 static const char *dbteste_getopnd ARGS((Test_env *, Test_op, int)); 37 static int dbteste_eval ARGS((Test_env *, Test_op, const char *, 38 const char *, int)); 39 static void dbteste_error ARGS((Test_env *, int, const char *)); 40 #endif /* KSH */ 41 #ifdef OS2 42 static 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 */ 54 static char clexec_tab[MAXFD+1]; 55 #endif 56 57 /* 58 * we now use this function always. 59 */ 60 int 61 fd_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 */ 79 int 80 execute(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(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 */ 451 452 static int 453 comexec(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 } 755 756 static void 757 scriptexec(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 } 869 870 int 871 shcomexec(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 */ 886 struct tbl * 887 findfunc(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 */ 914 int 915 define(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 */ 959 void 960 builtin(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 */ 989 struct tbl * 990 findcom(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 tp->val.s = tp == &temp ? npath : str_save(npath, APERM); 1065 tp->flag |= ISSET|ALLOC; 1066 } else if ((flags & FC_FUNC) 1067 && (fpath = str_val(global("FPATH"))) != null 1068 && (npath = search(name, fpath, R_OK, 1069 &tp->u2.errno_)) != (char *) 0) 1070 { 1071 /* An undocumented feature of at&t ksh is that it 1072 * searches FPATH if a command is not found, even 1073 * if the command hasn't been set up as an autoloaded 1074 * function (ie, no typeset -uf). 1075 */ 1076 tp = &temp; 1077 tp->type = CFUNC; 1078 tp->flag = DEFINED; /* make ~ISSET */ 1079 tp->u.fpath = npath; 1080 } 1081 } 1082 return tp; 1083 } 1084 1085 /* 1086 * flush executable commands with relative paths 1087 */ 1088 void 1089 flushcom(all) 1090 int all; /* just relative or all */ 1091 { 1092 struct tbl *tp; 1093 struct tstate ts; 1094 1095 for (twalk(&ts, &taliases); (tp = tnext(&ts)) != NULL; ) 1096 if ((tp->flag&ISSET) && (all || !ISDIRSEP(tp->val.s[0]))) { 1097 if (tp->flag&ALLOC) { 1098 tp->flag &= ~(ALLOC|ISSET); 1099 afree(tp->val.s, APERM); 1100 } 1101 tp->flag &= ~ISSET; 1102 } 1103 } 1104 1105 /* Check if path is something we want to find. Returns -1 for failure. */ 1106 int 1107 search_access(pathx, mode, errnop) 1108 const char *pathx; 1109 int mode; 1110 int *errnop; /* set if candidate found, but not suitable */ 1111 { 1112 #ifndef OS2 1113 int ret, err = 0; 1114 struct stat statb; 1115 1116 if (stat(pathx, &statb) < 0) 1117 return -1; 1118 ret = eaccess(pathx, mode); 1119 if (ret < 0) 1120 err = errno; /* File exists, but we can't access it */ 1121 else if (mode == X_OK 1122 && (!S_ISREG(statb.st_mode) 1123 /* This 'cause access() says root can execute everything */ 1124 || !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))) 1125 { 1126 ret = -1; 1127 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1128 } 1129 if (err && errnop && !*errnop) 1130 *errnop = err; 1131 return ret; 1132 #else /* !OS2 */ 1133 /* 1134 * NOTE: ASSUMES path can be modified and has enough room at the 1135 * end of the string for a suffix (ie, 4 extra characters). 1136 * Certain code knows this (eg, eval.c(globit()), 1137 * exec.c(search())). 1138 */ 1139 static char *xsuffixes[] = { ".ksh", ".exe", ".", ".sh", ".cmd", 1140 ".com", ".bat", (char *) 0 1141 }; 1142 static char *rsuffixes[] = { ".ksh", ".", ".sh", ".cmd", ".bat", 1143 (char *) 0 1144 }; 1145 int i; 1146 char *mpath = (char *) pathx; 1147 char *tp = mpath + strlen(mpath); 1148 char *p; 1149 char **sfx; 1150 1151 /* If a suffix has been specified, check if it is one of the 1152 * suffixes that indicate the file is executable - if so, change 1153 * the access test to R_OK... 1154 * This code assumes OS/2 files can have only one suffix... 1155 */ 1156 if ((p = strrchr((p = ksh_strrchr_dirsep(mpath)) ? p : mpath, '.'))) { 1157 if (mode == X_OK) 1158 mode = R_OK; 1159 return search_access1(mpath, mode, errnop); 1160 } 1161 /* Try appending the various suffixes. Different suffixes for 1162 * read and execute 'cause we don't want to read an executable... 1163 */ 1164 sfx = mode == R_OK ? rsuffixes : xsuffixes; 1165 for (i = 0; sfx[i]; i++) { 1166 strcpy(tp, p = sfx[i]); 1167 if (search_access1(mpath, R_OK, errnop) == 0) 1168 return 0; 1169 *tp = '\0'; 1170 } 1171 return -1; 1172 #endif /* !OS2 */ 1173 } 1174 1175 #ifdef OS2 1176 static int 1177 search_access1(pathx, mode, errnop) 1178 const char *pathx; 1179 int mode; 1180 int *errnop; /* set if candidate found, but not suitable */ 1181 { 1182 int ret, err = 0; 1183 struct stat statb; 1184 1185 if (stat(pathx, &statb) < 0) 1186 return -1; 1187 ret = eaccess(pathx, mode); 1188 if (ret < 0) 1189 err = errno; /* File exists, but we can't access it */ 1190 else if (!S_ISREG(statb.st_mode)) { 1191 ret = -1; 1192 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1193 } 1194 if (err && errnop && !*errnop) 1195 *errnop = err; 1196 return ret; 1197 } 1198 #endif /* OS2 */ 1199 1200 /* 1201 * search for command with PATH 1202 */ 1203 char * 1204 search(name, pathx, mode, errnop) 1205 const char *name; 1206 const char *pathx; 1207 int mode; /* R_OK or X_OK */ 1208 int *errnop; /* set if candidate found, but not suitable */ 1209 { 1210 const char *sp, *p; 1211 char *xp; 1212 XString xs; 1213 int namelen; 1214 1215 if (errnop) 1216 *errnop = 0; 1217 #ifdef OS2 1218 /* Xinit() allocates 8 additional bytes, so appended suffixes won't 1219 * overflow the memory. 1220 */ 1221 namelen = strlen(name) + 1; 1222 Xinit(xs, xp, namelen, ATEMP); 1223 memcpy(Xstring(xs, xp), name, namelen); 1224 1225 if (ksh_strchr_dirsep(name)) { 1226 if (search_access(Xstring(xs, xp), mode, errnop) >= 0) 1227 return Xstring(xs, xp); /* not Xclose() - see above */ 1228 Xfree(xs, xp); 1229 return NULL; 1230 } 1231 1232 /* Look in current context always. (os2 style) */ 1233 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1234 return Xstring(xs, xp); /* not Xclose() - xp may be wrong */ 1235 #else /* OS2 */ 1236 if (ksh_strchr_dirsep(name)) { 1237 if (search_access(name, mode, errnop) == 0) 1238 return (char *)__UNCONST(name); 1239 return NULL; 1240 } 1241 1242 namelen = strlen(name) + 1; 1243 Xinit(xs, xp, 128, ATEMP); 1244 #endif /* OS2 */ 1245 1246 sp = pathx; 1247 while (sp != NULL) { 1248 xp = Xstring(xs, xp); 1249 if (!(p = strchr(sp, PATHSEP))) 1250 p = sp + strlen(sp); 1251 if (p != sp) { 1252 XcheckN(xs, xp, p - sp); 1253 memcpy(xp, sp, p - sp); 1254 xp += p - sp; 1255 *xp++ = DIRSEP; 1256 } 1257 sp = p; 1258 XcheckN(xs, xp, namelen); 1259 memcpy(xp, name, namelen); 1260 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1261 #ifdef OS2 1262 return Xstring(xs, xp); /* Not Xclose() - see above */ 1263 #else /* OS2 */ 1264 return Xclose(xs, xp + namelen); 1265 #endif /* OS2 */ 1266 if (*sp++ == '\0') 1267 sp = NULL; 1268 } 1269 Xfree(xs, xp); 1270 return NULL; 1271 } 1272 1273 static int 1274 call_builtin(tp, wp) 1275 struct tbl *tp; 1276 char **wp; 1277 { 1278 int rv; 1279 1280 builtin_argv0 = wp[0]; 1281 builtin_flag = tp->flag; 1282 shf_reopen(1, SHF_WR, shl_stdout); 1283 shl_stdout_ok = 1; 1284 ksh_getopt_reset(&builtin_opt, GF_ERROR); 1285 rv = (*tp->val.f)(wp); 1286 shf_flush(shl_stdout); 1287 shl_stdout_ok = 0; 1288 builtin_flag = 0; 1289 builtin_argv0 = (char *) 0; 1290 return rv; 1291 } 1292 1293 /* 1294 * set up redirection, saving old fd's in e->savefd 1295 */ 1296 static int 1297 iosetup(iop, tp) 1298 register struct ioword *iop; 1299 struct tbl *tp; 1300 { 1301 register int u = -1; 1302 char *cp = iop->name; 1303 int iotype = iop->flag & IOTYPE; 1304 int do_open = 1, do_close = 0, UNINITIALIZED(flags); 1305 struct ioword iotmp; 1306 struct stat statb; 1307 1308 if (iotype != IOHERE) 1309 cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0)); 1310 1311 /* Used for tracing and error messages to print expanded cp */ 1312 iotmp = *iop; 1313 iotmp.name = (iotype == IOHERE) ? (char *) 0 : cp; 1314 iotmp.flag |= IONAMEXP; 1315 1316 if (Flag(FXTRACE)) 1317 shellf("%s%s\n", 1318 PS4_SUBSTITUTE(str_val(global("PS4"))), 1319 snptreef((char *) 0, 32, "%R", &iotmp)); 1320 1321 switch (iotype) { 1322 case IOREAD: 1323 flags = O_RDONLY; 1324 break; 1325 1326 case IOCAT: 1327 flags = O_WRONLY | O_APPEND | O_CREAT; 1328 break; 1329 1330 case IOWRITE: 1331 flags = O_WRONLY | O_CREAT | O_TRUNC; 1332 /* The stat() is here to allow redirections to 1333 * things like /dev/null without error. 1334 */ 1335 if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) 1336 && (stat(cp, &statb) < 0 || S_ISREG(statb.st_mode))) 1337 flags |= O_EXCL; 1338 break; 1339 1340 case IORDWR: 1341 flags = O_RDWR | O_CREAT; 1342 break; 1343 1344 case IOHERE: 1345 do_open = 0; 1346 /* herein() returns -2 if error has been printed */ 1347 u = herein(iop->heredoc, iop->flag & IOEVAL); 1348 /* cp may have wrong name */ 1349 break; 1350 1351 case IODUP: 1352 { 1353 const char *emsg; 1354 1355 do_open = 0; 1356 if (*cp == '-' && !cp[1]) { 1357 u = 1009; /* prevent error return below */ 1358 do_close = 1; 1359 } else if ((u = check_fd(cp, 1360 X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK), 1361 &emsg)) < 0) 1362 { 1363 warningf(TRUE, "%s: %s", 1364 snptreef((char *) 0, 32, "%R", &iotmp), emsg); 1365 return -1; 1366 } 1367 if (u == iop->unit) 1368 return 0; /* "dup from" == "dup to" */ 1369 break; 1370 } 1371 } 1372 if (do_open) { 1373 if (Flag(FRESTRICTED) && (flags & O_CREAT)) { 1374 warningf(TRUE, "%s: restricted", cp); 1375 return -1; 1376 } 1377 u = open(cp, flags, 0666); 1378 #ifdef OS2 1379 if (u < 0 && strcmp(cp, "/dev/null") == 0) 1380 u = open("nul", flags, 0666); 1381 #endif /* OS2 */ 1382 } 1383 if (u < 0) { 1384 /* herein() may already have printed message */ 1385 if (u == -1) 1386 warningf(TRUE, "cannot %s %s: %s", 1387 iotype == IODUP ? "dup" 1388 : (iotype == IOREAD || iotype == IOHERE) ? 1389 "open" : "create", cp, strerror(errno)); 1390 return -1; 1391 } 1392 /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ 1393 if (e->savefd[iop->unit] == 0) { 1394 /* If these are the same, it means unit was previously closed */ 1395 if (u == iop->unit) 1396 e->savefd[iop->unit] = -1; 1397 else 1398 /* c_exec() assumes e->savefd[fd] set for any 1399 * redirections. Ask savefd() not to close iop->unit; 1400 * this allows error messages to be seen if iop->unit 1401 * is 2; also means we can't lose the fd (eg, both 1402 * dup2 below and dup2 in restfd() failing). 1403 */ 1404 e->savefd[iop->unit] = savefd(iop->unit, 1); 1405 } 1406 1407 if (do_close) 1408 close(iop->unit); 1409 else if (u != iop->unit) { 1410 if (ksh_dup2(u, iop->unit, TRUE) < 0) { 1411 warningf(TRUE, 1412 "could not finish (dup) redirection %s: %s", 1413 snptreef((char *) 0, 32, "%R", &iotmp), 1414 strerror(errno)); 1415 if (iotype != IODUP) 1416 close(u); 1417 return -1; 1418 } 1419 if (iotype != IODUP) 1420 close(u); 1421 #ifdef KSH 1422 /* Touching any co-process fd in an empty exec 1423 * causes the shell to close its copies 1424 */ 1425 else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { 1426 if (iop->flag & IORDUP) /* possible exec <&p */ 1427 coproc_read_close(u); 1428 else /* possible exec >&p */ 1429 coproc_write_close(u); 1430 } 1431 #endif /* KSH */ 1432 } 1433 if (u == 2) /* Clear any write errors */ 1434 shf_reopen(2, SHF_WR, shl_out); 1435 return 0; 1436 } 1437 1438 /* 1439 * open here document temp file. 1440 * if unquoted here, expand here temp file into second temp file. 1441 */ 1442 static int 1443 herein(content, sub) 1444 const char *content; 1445 int sub; 1446 { 1447 volatile int fd = -1; 1448 struct source *s, *volatile osource; 1449 struct shf *volatile shf; 1450 struct temp *h; 1451 int i; 1452 1453 /* ksh -c 'cat << EOF' can cause this... */ 1454 if (content == (char *) 0) { 1455 warningf(TRUE, "here document missing"); 1456 return -2; /* special to iosetup(): don't print error */ 1457 } 1458 1459 /* Create temp file to hold content (done before newenv so temp 1460 * doesn't get removed too soon). 1461 */ 1462 h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps); 1463 if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) { 1464 warningf(TRUE, "can't %s temporary file %s: %s", 1465 !shf ? "create" : "open", 1466 h->name, strerror(errno)); 1467 if (shf) 1468 shf_close(shf); 1469 return -2 /* special to iosetup(): don't print error */; 1470 } 1471 1472 osource = source; 1473 newenv(E_ERRH); 1474 i = ksh_sigsetjmp(e->jbuf, 0); 1475 if (i) { 1476 source = osource; 1477 quitenv(); 1478 shf_close(shf); /* after quitenv */ 1479 close(fd); 1480 return -2; /* special to iosetup(): don't print error */ 1481 } 1482 if (sub) { 1483 /* Do substitutions on the content of heredoc */ 1484 s = pushs(SSTRING, ATEMP); 1485 s->start = s->str = content; 1486 source = s; 1487 if (yylex(ONEWORD|HEREDOC) != LWORD) 1488 internal_errorf(1, "herein: yylex"); 1489 source = osource; 1490 shf_puts(evalstr(yylval.cp, 0), shf); 1491 } else 1492 shf_puts(content, shf); 1493 1494 quitenv(); 1495 1496 if (shf_close(shf) == EOF) { 1497 close(fd); 1498 warningf(TRUE, "error writing %s: %s", h->name, 1499 strerror(errno)); 1500 return -2; /* special to iosetup(): don't print error */ 1501 } 1502 1503 return fd; 1504 } 1505 1506 #ifdef KSH 1507 /* 1508 * ksh special - the select command processing section 1509 * print the args in column form - assuming that we can 1510 */ 1511 static char * 1512 do_selectargs(ap, print_menu) 1513 register char **ap; 1514 bool_t print_menu; 1515 { 1516 static const char *const read_args[] = { 1517 "read", "-r", "REPLY", (char *) 0 1518 }; 1519 char *s; 1520 int i, argct; 1521 1522 for (argct = 0; ap[argct]; argct++) 1523 ; 1524 while (1) { 1525 /* Menu is printed if 1526 * - this is the first time around the select loop 1527 * - the user enters a blank line 1528 * - the REPLY parameter is empty 1529 */ 1530 if (print_menu || !*str_val(global("REPLY"))) 1531 pr_menu(ap); 1532 shellf("%s", str_val(global("PS3"))); 1533 if (call_builtin(findcom("read", FC_BI), 1534 (char **) __UNCONST(read_args))) 1535 return (char *) 0; 1536 s = str_val(global("REPLY")); 1537 if (*s) { 1538 i = atoi(s); 1539 return (i >= 1 && i <= argct) ? ap[i - 1] : null; 1540 } 1541 print_menu = 1; 1542 } 1543 } 1544 1545 struct select_menu_info { 1546 char *const *args; 1547 int arg_width; 1548 int num_width; 1549 } info; 1550 1551 static char *select_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); 1552 1553 /* format a single select menu item */ 1554 static char * 1555 select_fmt_entry(arg, i, buf, buflen) 1556 void *arg; 1557 int i; 1558 char *buf; 1559 int buflen; 1560 { 1561 struct select_menu_info *smi = (struct select_menu_info *) arg; 1562 1563 shf_snprintf(buf, buflen, "%*d) %s", 1564 smi->num_width, i + 1, smi->args[i]); 1565 return buf; 1566 } 1567 1568 /* 1569 * print a select style menu 1570 */ 1571 int 1572 pr_menu(ap) 1573 char *const *ap; 1574 { 1575 struct select_menu_info smi; 1576 char *const *pp; 1577 int nwidth, dwidth; 1578 int i, n; 1579 1580 /* Width/column calculations were done once and saved, but this 1581 * means select can't be used recursively so we re-calculate each 1582 * time (could save in a structure that is returned, but its probably 1583 * not worth the bother). 1584 */ 1585 1586 /* 1587 * get dimensions of the list 1588 */ 1589 for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { 1590 i = strlen(*pp); 1591 nwidth = (i > nwidth) ? i : nwidth; 1592 } 1593 /* 1594 * we will print an index of the form 1595 * %d) 1596 * in front of each entry 1597 * get the max width of this 1598 */ 1599 for (i = n, dwidth = 1; i >= 10; i /= 10) 1600 dwidth++; 1601 1602 smi.args = ap; 1603 smi.arg_width = nwidth; 1604 smi.num_width = dwidth; 1605 print_columns(shl_out, n, select_fmt_entry, (void *) &smi, 1606 dwidth + nwidth + 2, 1); 1607 1608 return n; 1609 } 1610 1611 /* XXX: horrible kludge to fit within the framework */ 1612 1613 static char *plain_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); 1614 1615 static char * 1616 plain_fmt_entry(arg, i, buf, buflen) 1617 void *arg; 1618 int i; 1619 char *buf; 1620 int buflen; 1621 { 1622 shf_snprintf(buf, buflen, "%s", ((char *const *)arg)[i]); 1623 return buf; 1624 } 1625 1626 int 1627 pr_list(ap) 1628 char *const *ap; 1629 { 1630 char *const *pp; 1631 int nwidth; 1632 int i, n; 1633 1634 for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { 1635 i = strlen(*pp); 1636 nwidth = (i > nwidth) ? i : nwidth; 1637 } 1638 print_columns(shl_out, n, plain_fmt_entry, (void *)__UNCONST(ap), 1639 nwidth + 1, 0); 1640 1641 return n; 1642 } 1643 #endif /* KSH */ 1644 #ifdef KSH 1645 1646 /* 1647 * [[ ... ]] evaluation routines 1648 */ 1649 1650 extern const char *const dbtest_tokens[]; 1651 extern const char db_close[]; 1652 1653 /* Test if the current token is a whatever. Accepts the current token if 1654 * it is. Returns 0 if it is not, non-zero if it is (in the case of 1655 * TM_UNOP and TM_BINOP, the returned value is a Test_op). 1656 */ 1657 static int 1658 dbteste_isa(te, meta) 1659 Test_env *te; 1660 Test_meta meta; 1661 { 1662 int ret = 0; 1663 int uqword; 1664 char *p; 1665 1666 if (!*te->pos.wp) 1667 return meta == TM_END; 1668 1669 /* unquoted word? */ 1670 for (p = *te->pos.wp; *p == CHAR; p += 2) 1671 ; 1672 uqword = *p == EOS; 1673 1674 if (meta == TM_UNOP || meta == TM_BINOP) { 1675 if (uqword) { 1676 char buf[8]; /* longer than the longest operator */ 1677 char *q = buf; 1678 for (p = *te->pos.wp; *p == CHAR 1679 && q < &buf[sizeof(buf) - 1]; 1680 p += 2) 1681 *q++ = p[1]; 1682 *q = '\0'; 1683 ret = (int) test_isop(te, meta, buf); 1684 } 1685 } else if (meta == TM_END) 1686 ret = 0; 1687 else 1688 ret = uqword 1689 && strcmp(*te->pos.wp, dbtest_tokens[(int) meta]) == 0; 1690 1691 /* Accept the token? */ 1692 if (ret) 1693 te->pos.wp++; 1694 1695 return ret; 1696 } 1697 1698 static const char * 1699 dbteste_getopnd(te, op, do_eval) 1700 Test_env *te; 1701 Test_op op; 1702 int do_eval; 1703 { 1704 char *s = *te->pos.wp; 1705 1706 if (!s) 1707 return (char *) 0; 1708 1709 te->pos.wp++; 1710 1711 if (!do_eval) 1712 return null; 1713 1714 if (op == TO_STEQL || op == TO_STNEQ) 1715 s = evalstr(s, DOTILDE | DOPAT); 1716 else 1717 s = evalstr(s, DOTILDE); 1718 1719 return s; 1720 } 1721 1722 static int 1723 dbteste_eval(te, op, opnd1, opnd2, do_eval) 1724 Test_env *te; 1725 Test_op op; 1726 const char *opnd1; 1727 const char *opnd2; 1728 int do_eval; 1729 { 1730 return test_eval(te, op, opnd1, opnd2, do_eval); 1731 } 1732 1733 static void 1734 dbteste_error(te, offset, msg) 1735 Test_env *te; 1736 int offset; 1737 const char *msg; 1738 { 1739 te->flags |= TEF_ERROR; 1740 internal_errorf(0, "dbteste_error: %s (offset %d)", msg, offset); 1741 } 1742 #endif /* KSH */ 1743