1 /* $NetBSD: exec.c,v 1.5 1999/10/20 15:09:59 hubertf 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((const char *content, 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 & ~XTIME, -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 c_eval()) and by c_set(). 108 */ 109 subst_exstat = 0; 110 111 current_lineno = t->lineno; /* for $LINENO */ 112 113 /* POSIX says expand command words first, then redirections, 114 * and assignments last.. 115 */ 116 ap = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE); 117 if (flags & XTIME) 118 /* Allow option parsing (bizarre, but POSIX) */ 119 timex_hook(t, &ap); 120 if (Flag(FXTRACE) && ap[0]) { 121 shf_fprintf(shl_out, "%s", 122 PS4_SUBSTITUTE(str_val(global("PS4")))); 123 for (i = 0; ap[i]; i++) 124 shf_fprintf(shl_out, "%s%s", ap[i], 125 ap[i + 1] ? space : newline); 126 shf_flush(shl_out); 127 } 128 if (ap[0]) 129 tp = findcom(ap[0], FC_BI|FC_FUNC); 130 } 131 flags &= ~XTIME; 132 133 if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) { 134 e->savefd = (short *) alloc(sizeofN(short, NUFILE), ATEMP); 135 /* initialize to not redirected */ 136 memset(e->savefd, 0, sizeofN(short, NUFILE)); 137 } 138 139 /* do redirection, to be restored in quitenv() */ 140 if (t->ioact != NULL) 141 for (iowp = t->ioact; *iowp != NULL; iowp++) { 142 if (iosetup(*iowp, tp) < 0) { 143 exstat = rv = 1; 144 /* Redirection failures for special commands 145 * cause (non-interactive) shell to exit. 146 */ 147 if (tp && tp->type == CSHELL 148 && (tp->flag & SPEC_BI)) 149 errorf(null); 150 /* Deal with FERREXIT, quitenv(), etc. */ 151 goto Break; 152 } 153 } 154 155 switch(t->type) { 156 case TCOM: 157 rv = comexec(t, tp, ap, flags); 158 break; 159 160 case TPAREN: 161 rv = execute(t->left, flags|XFORK); 162 break; 163 164 case TPIPE: 165 flags |= XFORK; 166 flags &= ~XEXEC; 167 e->savefd[0] = savefd(0, 0); 168 (void) ksh_dup2(e->savefd[0], 0, FALSE); /* stdin of first */ 169 e->savefd[1] = savefd(1, 0); 170 while (t->type == TPIPE) { 171 openpipe(pv); 172 (void) ksh_dup2(pv[1], 1, FALSE); /* stdout of curr */ 173 /* Let exchild() close pv[0] in child 174 * (if this isn't done, commands like 175 * (: ; cat /etc/termcap) | sleep 1 176 * will hang forever). 177 */ 178 exchild(t->left, flags|XPIPEO|XCCLOSE, pv[0]); 179 (void) ksh_dup2(pv[0], 0, FALSE); /* stdin of next */ 180 closepipe(pv); 181 flags |= XPIPEI; 182 t = t->right; 183 } 184 restfd(1, e->savefd[1]); /* stdout of last */ 185 e->savefd[1] = 0; /* no need to re-restore this */ 186 /* Let exchild() close 0 in parent, after fork, before wait */ 187 i = exchild(t, flags|XPCLOSE, 0); 188 if (!(flags&XBGND) && !(flags&XXCOM)) 189 rv = i; 190 break; 191 192 case TLIST: 193 while (t->type == TLIST) { 194 execute(t->left, flags & XERROK); 195 t = t->right; 196 } 197 rv = execute(t, flags & XERROK); 198 break; 199 200 #ifdef KSH 201 case TCOPROC: 202 { 203 # ifdef JOB_SIGS 204 sigset_t omask; 205 # endif /* JOB_SIGS */ 206 207 # ifdef JOB_SIGS 208 /* Block sigchild as we are using things changed in the 209 * signal handler 210 */ 211 sigprocmask(SIG_BLOCK, &sm_sigchld, &omask); 212 e->type = E_ERRH; 213 i = ksh_sigsetjmp(e->jbuf, 0); 214 if (i) { 215 sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); 216 quitenv(); 217 unwind(i); 218 /*NOTREACHED*/ 219 } 220 # endif /* JOB_SIGS */ 221 /* Already have a (live) co-process? */ 222 if (coproc.job && coproc.write >= 0) 223 errorf("coprocess already exists"); 224 225 /* Can we re-use the existing co-process pipe? */ 226 coproc_cleanup(TRUE); 227 228 /* do this before opening pipes, in case these fail */ 229 e->savefd[0] = savefd(0, 0); 230 e->savefd[1] = savefd(1, 0); 231 232 openpipe(pv); 233 ksh_dup2(pv[0], 0, FALSE); 234 close(pv[0]); 235 coproc.write = pv[1]; 236 coproc.job = (void *) 0; 237 238 if (coproc.readw >= 0) 239 ksh_dup2(coproc.readw, 1, FALSE); 240 else { 241 openpipe(pv); 242 coproc.read = pv[0]; 243 ksh_dup2(pv[1], 1, FALSE); 244 coproc.readw = pv[1]; /* closed before first read */ 245 coproc.njobs = 0; 246 /* create new coprocess id */ 247 ++coproc.id; 248 } 249 # ifdef JOB_SIGS 250 sigprocmask(SIG_SETMASK, &omask, (sigset_t *) 0); 251 e->type = E_EXEC; /* no more need for error handler */ 252 # endif /* JOB_SIGS */ 253 254 /* exchild() closes coproc.* in child after fork, 255 * will also increment coproc.njobs when the 256 * job is actually created. 257 */ 258 flags &= ~XEXEC; 259 exchild(t->left, flags|XBGND|XFORK|XCOPROC|XCCLOSE, 260 coproc.readw); 261 break; 262 } 263 #endif /* KSH */ 264 265 case TASYNC: 266 /* XXX non-optimal, I think - "(foo &)", forks for (), 267 * forks again for async... parent should optimize 268 * this to "foo &"... 269 */ 270 rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK); 271 break; 272 273 case TOR: 274 case TAND: 275 rv = execute(t->left, XERROK); 276 if (t->right != NULL && (rv == 0) == (t->type == TAND)) 277 rv = execute(t->right, flags & XERROK); 278 else 279 flags |= XERROK; 280 break; 281 282 case TBANG: 283 rv = !execute(t->right, XERROK); 284 break; 285 286 #ifdef KSH 287 case TDBRACKET: 288 { 289 Test_env te; 290 291 te.flags = TEF_DBRACKET; 292 te.pos.wp = t->args; 293 te.isa = dbteste_isa; 294 te.getopnd = dbteste_getopnd; 295 te.eval = dbteste_eval; 296 te.error = dbteste_error; 297 298 rv = test_parse(&te); 299 break; 300 } 301 #endif /* KSH */ 302 303 case TFOR: 304 #ifdef KSH 305 case TSELECT: 306 { 307 volatile bool_t is_first = TRUE; 308 #endif /* KSH */ 309 ap = (t->vars != NULL) ? 310 eval(t->vars, DOBLANK|DOGLOB|DOTILDE) 311 : e->loc->argv + 1; 312 e->type = E_LOOP; 313 while (1) { 314 i = ksh_sigsetjmp(e->jbuf, 0); 315 if (!i) 316 break; 317 if ((e->flags&EF_BRKCONT_PASS) 318 || (i != LBREAK && i != LCONTIN)) 319 { 320 quitenv(); 321 unwind(i); 322 } else if (i == LBREAK) { 323 rv = 0; 324 goto Break; 325 } 326 } 327 rv = 0; /* in case of a continue */ 328 if (t->type == TFOR) { 329 while (*ap != NULL) { 330 setstr(global(t->str), *ap++, KSH_UNWIND_ERROR); 331 rv = execute(t->left, flags & XERROK); 332 } 333 } 334 #ifdef KSH 335 else { /* TSELECT */ 336 for (;;) { 337 if (!(cp = do_selectargs(ap, is_first))) { 338 rv = 1; 339 break; 340 } 341 is_first = FALSE; 342 setstr(global(t->str), cp, KSH_UNWIND_ERROR); 343 rv = execute(t->left, flags & XERROK); 344 } 345 } 346 } 347 #endif /* KSH */ 348 break; 349 350 case TWHILE: 351 case TUNTIL: 352 e->type = E_LOOP; 353 while (1) { 354 i = ksh_sigsetjmp(e->jbuf, 0); 355 if (!i) 356 break; 357 if ((e->flags&EF_BRKCONT_PASS) 358 || (i != LBREAK && i != LCONTIN)) 359 { 360 quitenv(); 361 unwind(i); 362 } else if (i == LBREAK) { 363 rv = 0; 364 goto Break; 365 } 366 } 367 rv = 0; /* in case of a continue */ 368 while ((execute(t->left, XERROK) == 0) == (t->type == TWHILE)) 369 rv = execute(t->right, flags & XERROK); 370 break; 371 372 case TIF: 373 case TELIF: 374 if (t->right == NULL) 375 break; /* should be error */ 376 rv = execute(t->left, XERROK) == 0 ? 377 execute(t->right->left, flags & XERROK) : 378 execute(t->right->right, flags & XERROK); 379 break; 380 381 case TCASE: 382 cp = evalstr(t->str, DOTILDE); 383 for (t = t->left; t != NULL && t->type == TPAT; t = t->right) 384 for (ap = t->vars; *ap; ap++) 385 if ((s = evalstr(*ap, DOTILDE|DOPAT)) 386 && gmatch(cp, s, FALSE)) 387 goto Found; 388 break; 389 Found: 390 rv = execute(t->left, flags & XERROK); 391 break; 392 393 case TBRACE: 394 rv = execute(t->left, flags & XERROK); 395 break; 396 397 case TFUNCT: 398 rv = define(t->str, t); 399 break; 400 401 case TTIME: 402 /* Clear XEXEC so nested execute() call doesn't exit 403 * (allows "ls -l | time grep foo"). 404 */ 405 rv = timex(t, flags & ~XEXEC); 406 break; 407 408 case TEXEC: /* an eval'd TCOM */ 409 s = t->args[0]; 410 ap = makenv(); 411 #ifndef F_SETFD 412 for (i = 0; i < sizeof(clexec_tab); i++) 413 if (clexec_tab[i]) { 414 close(i); 415 clexec_tab[i] = 0; 416 } 417 #endif 418 restoresigs(); 419 cleanup_proc_env(); 420 /* XINTACT bit is for OS2 */ 421 ksh_execve(t->str, t->args, ap, (flags & XINTACT) ? 1 : 0); 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 unwind(LEXIT); /* exit child */ 433 /* NOTREACHED */ 434 } 435 if (rv != 0 && !(flags & XERROK)) { 436 if (Flag(FERREXIT)) 437 unwind(LERROR); 438 trapsig(SIGERR_); 439 } 440 return rv; 441 } 442 443 /* 444 * execute simple command 445 */ 446 447 static int 448 comexec(t, tp, ap, flags) 449 struct op *t; 450 struct tbl *volatile tp; 451 register char **ap; 452 int volatile flags; 453 { 454 int i; 455 int rv = 0; 456 register char *cp; 457 register char **lastp; 458 static struct op texec; /* Must be static (XXX but why?) */ 459 int type_flags; 460 int keepasn_ok; 461 int fcflags = FC_BI|FC_FUNC|FC_PATH; 462 #ifdef __GNUC__ 463 (void) &rv; 464 #endif 465 466 #ifdef KSH 467 /* snag the last argument for $_ XXX not the same as at&t ksh, 468 * which only seems to set $_ after a newline (but not in 469 * functions/dot scripts, but in interactive and scipt) - 470 * perhaps save last arg here and set it in shell()?. 471 */ 472 if (Flag(FTALKING) && *(lastp = ap)) { 473 while (*++lastp) 474 ; 475 /* setstr() can't fail here */ 476 setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp, 477 KSH_RETURN_ERROR); 478 } 479 #endif /* KSH */ 480 481 /* Deal with the shell builtins builtin, exec and command since 482 * they can be followed by other commands. This must be done before 483 * we know if we should create a local block, which must be done 484 * before we can do a path search (in case the assignments change 485 * PATH). 486 * Odd cases: 487 * FOO=bar exec > /dev/null FOO is kept but not exported 488 * FOO=bar exec foobar FOO is exported 489 * FOO=bar command exec > /dev/null FOO is neither kept nor exported 490 * FOO=bar command FOO is neither kept nor exported 491 * PATH=... foobar use new PATH in foobar search 492 */ 493 keepasn_ok = 1; 494 while (tp && tp->type == CSHELL) { 495 fcflags = FC_BI|FC_FUNC|FC_PATH;/* undo effects of command */ 496 if (tp->val.f == c_builtin) { 497 if ((cp = *++ap) == NULL) { 498 tp = NULL; 499 break; 500 } 501 tp = findcom(cp, FC_BI); 502 if (tp == NULL) 503 errorf("builtin: %s: not a builtin", cp); 504 continue; 505 } else if (tp->val.f == c_exec) { 506 if (ap[1] == NULL) 507 break; 508 ap++; 509 flags |= XEXEC; 510 } else if (tp->val.f == c_command) { 511 int optc, saw_p = 0; 512 513 /* Ugly dealing with options in two places (here and 514 * in c_command(), but such is life) 515 */ 516 ksh_getopt_reset(&builtin_opt, 0); 517 while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) 518 == 'p') 519 saw_p = 1; 520 if (optc != EOF) 521 break; /* command -vV or something */ 522 /* don't look for functions */ 523 fcflags = FC_BI|FC_PATH; 524 if (saw_p) { 525 if (Flag(FRESTRICTED)) { 526 warningf(TRUE, 527 "command -p: restricted"); 528 rv = 1; 529 goto Leave; 530 } 531 fcflags |= FC_DEFPATH; 532 } 533 ap += builtin_opt.optind; 534 /* POSIX says special builtins lose their status 535 * if accessed using command. 536 */ 537 keepasn_ok = 0; 538 if (!ap[0]) { 539 /* ensure command with no args exits with 0 */ 540 subst_exstat = 0; 541 break; 542 } 543 } else 544 break; 545 tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC)); 546 } 547 if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN)))) 548 type_flags = 0; 549 else { 550 /* create new variable/function block */ 551 newblock(); 552 /* ksh functions don't keep assignments, POSIX functions do. */ 553 if (keepasn_ok && tp && tp->type == CFUNC 554 && !(tp->flag & FKSH)) 555 type_flags = 0; 556 else 557 type_flags = LOCAL|LOCAL_COPY|EXPORT; 558 } 559 if (Flag(FEXPORT)) 560 type_flags |= EXPORT; 561 for (i = 0; t->vars[i]; i++) { 562 cp = evalstr(t->vars[i], DOASNTILDE); 563 if (Flag(FXTRACE)) { 564 if (i == 0) 565 shf_fprintf(shl_out, "%s", 566 PS4_SUBSTITUTE(str_val(global("PS4")))); 567 shf_fprintf(shl_out, "%s%s", cp, 568 t->vars[i + 1] ? space : newline); 569 if (!t->vars[i + 1]) 570 shf_flush(shl_out); 571 } 572 typeset(cp, type_flags, 0, 0, 0); 573 } 574 575 if ((cp = *ap) == NULL) { 576 rv = subst_exstat; 577 goto Leave; 578 } else if (!tp) { 579 if (Flag(FRESTRICTED) && ksh_strchr_dirsep(cp)) { 580 warningf(TRUE, "%s: restricted", cp); 581 rv = 1; 582 goto Leave; 583 } 584 tp = findcom(cp, fcflags); 585 } 586 587 switch (tp->type) { 588 case CSHELL: /* shell built-in */ 589 rv = call_builtin(tp, ap); 590 break; 591 592 case CFUNC: /* function call */ 593 { 594 volatile int old_xflag; 595 volatile Tflag old_inuse; 596 const char *volatile old_kshname; 597 598 if (!(tp->flag & ISSET)) { 599 struct tbl *ftp; 600 601 if (!tp->u.fpath) { 602 if (tp->u2.errno_) { 603 warningf(TRUE, 604 "%s: can't find function definition file - %s", 605 cp, strerror(tp->u2.errno_)); 606 rv = 126; 607 } else { 608 warningf(TRUE, 609 "%s: can't find function definition file", cp); 610 rv = 127; 611 } 612 break; 613 } 614 if (include(tp->u.fpath, 0, (char **) 0, 0) < 0) { 615 warningf(TRUE, 616 "%s: can't open function definition file %s - %s", 617 cp, tp->u.fpath, strerror(errno)); 618 rv = 127; 619 break; 620 } 621 if (!(ftp = findfunc(cp, hash(cp), FALSE)) 622 || !(ftp->flag & ISSET)) 623 { 624 warningf(TRUE, 625 "%s: function not defined by %s", 626 cp, tp->u.fpath); 627 rv = 127; 628 break; 629 } 630 tp = ftp; 631 } 632 633 /* ksh functions set $0 to function name, POSIX functions leave 634 * $0 unchanged. 635 */ 636 old_kshname = kshname; 637 if (tp->flag & FKSH) 638 kshname = ap[0]; 639 else 640 ap[0] = (char *) kshname; 641 e->loc->argv = ap; 642 for (i = 0; *ap++ != NULL; i++) 643 ; 644 e->loc->argc = i - 1; 645 /* ksh-style functions handle getopts sanely, 646 * bourne/posix functions are insane... 647 */ 648 if (tp->flag & FKSH) { 649 e->loc->flags |= BF_DOGETOPTS; 650 e->loc->getopts_state = user_opt; 651 getopts_reset(1); 652 } 653 654 old_xflag = Flag(FXTRACE); 655 Flag(FXTRACE) = tp->flag & TRACE ? TRUE : FALSE; 656 657 old_inuse = tp->flag & FINUSE; 658 tp->flag |= FINUSE; 659 660 e->type = E_FUNC; 661 i = ksh_sigsetjmp(e->jbuf, 0); 662 if (i == 0) { 663 /* seems odd to pass XERROK here, but at&t ksh does */ 664 exstat = execute(tp->val.t, flags & XERROK); 665 i = LRETURN; 666 } 667 kshname = old_kshname; 668 Flag(FXTRACE) = old_xflag; 669 tp->flag = (tp->flag & ~FINUSE) | old_inuse; 670 /* Were we deleted while executing? If so, free the execution 671 * tree. todo: Unfortunately, the table entry is never re-used 672 * until the lookup table is expanded. 673 */ 674 if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) { 675 if (tp->flag & ALLOC) { 676 tp->flag &= ~ALLOC; 677 tfree(tp->val.t, tp->areap); 678 } 679 tp->flag = 0; 680 } 681 switch (i) { 682 case LRETURN: 683 case LERROR: 684 rv = exstat; 685 break; 686 case LINTR: 687 case LEXIT: 688 case LLEAVE: 689 case LSHELL: 690 quitenv(); 691 unwind(i); 692 /*NOTREACHED*/ 693 default: 694 quitenv(); 695 internal_errorf(1, "CFUNC %d", i); 696 } 697 break; 698 } 699 700 case CEXEC: /* executable command */ 701 case CTALIAS: /* tracked alias */ 702 if (!(tp->flag&ISSET)) { 703 /* errno_ will be set if the named command was found 704 * but could not be executed (permissions, no execute 705 * bit, directory, etc). Print out a (hopefully) 706 * useful error message and set the exit status to 126. 707 */ 708 if (tp->u2.errno_) { 709 warningf(TRUE, "%s: cannot execute - %s", cp, 710 strerror(tp->u2.errno_)); 711 rv = 126; /* POSIX */ 712 } else { 713 warningf(TRUE, "%s: not found", cp); 714 rv = 127; 715 } 716 break; 717 } 718 719 #ifdef KSH 720 /* set $_ to program's full path */ 721 /* setstr() can't fail here */ 722 setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0), tp->val.s, 723 KSH_RETURN_ERROR); 724 #endif /* KSH */ 725 726 if (flags&XEXEC) { 727 j_exit(); 728 if (!(flags&XBGND) || Flag(FMONITOR)) { 729 setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG); 730 setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG); 731 } 732 } 733 734 /* to fork we set up a TEXEC node and call execute */ 735 texec.type = TEXEC; 736 texec.left = t; /* for tprint */ 737 texec.str = tp->val.s; 738 texec.args = ap; 739 rv = exchild(&texec, flags, -1); 740 break; 741 } 742 Leave: 743 if (flags & XEXEC) { 744 exstat = rv; 745 unwind(LLEAVE); 746 } 747 return rv; 748 } 749 750 static void 751 scriptexec(tp, ap) 752 register struct op *tp; 753 register char **ap; 754 { 755 char *shell; 756 757 shell = str_val(global(EXECSHELL_STR)); 758 if (shell && *shell) 759 shell = search(shell, path, X_OK, (int *) 0); 760 if (!shell || !*shell) 761 shell = EXECSHELL; 762 763 *tp->args-- = tp->str; 764 #ifdef SHARPBANG 765 { 766 char buf[LINE]; 767 register char *cp; 768 register int fd, n; 769 770 buf[0] = '\0'; 771 if ((fd = open(tp->str, O_RDONLY)) >= 0) { 772 if ((n = read(fd, buf, LINE - 1)) > 0) 773 buf[n] = '\0'; 774 (void) close(fd); 775 } 776 if ((buf[0] == '#' && buf[1] == '!' && (cp = &buf[2])) 777 # ifdef OS2 778 || (strncmp(buf, "extproc", 7) == 0 && isspace(buf[7]) 779 && (cp = &buf[7])) 780 # endif /* OS2 */ 781 ) 782 { 783 while (*cp && (*cp == ' ' || *cp == '\t')) 784 cp++; 785 if (*cp && *cp != '\n') { 786 char *a0 = cp, *a1 = (char *) 0; 787 # ifdef OS2 788 char *a2 = cp; 789 # endif /* OS2 */ 790 791 while (*cp && *cp != '\n' && *cp != ' ' 792 && *cp != '\t') 793 { 794 # ifdef OS2 795 /* Allow shell search without prepended path 796 * if shell with / in pathname cannot be found. 797 * Use / explicitly so \ can be used if explicit 798 * needs to be forced. 799 */ 800 if (*cp == '/') 801 a2 = cp + 1; 802 # endif /* OS2 */ 803 cp++; 804 } 805 if (*cp && *cp != '\n') { 806 *cp++ = '\0'; 807 while (*cp 808 && (*cp == ' ' || *cp == '\t')) 809 cp++; 810 if (*cp && *cp != '\n') { 811 a1 = cp; 812 /* all one argument */ 813 while (*cp && *cp != '\n') 814 cp++; 815 } 816 } 817 if (*cp == '\n') { 818 *cp = '\0'; 819 if (a1) 820 *tp->args-- = a1; 821 # ifdef OS2 822 if (a0 != a2) { 823 char *tmp_a0 = str_nsave(a0, 824 strlen(a0) + 5, ATEMP); 825 if (search_access(tmp_a0, X_OK, 826 (int *) 0)) 827 a0 = a2; 828 afree(tmp_a0, ATEMP); 829 } 830 # endif /* OS2 */ 831 shell = a0; 832 } 833 } 834 # ifdef OS2 835 } else { 836 /* Use ksh documented shell default if present 837 * else use OS2_SHELL which is assumed to need 838 * the /c option and '\' as dir separater. 839 */ 840 char *p = shell; 841 842 shell = str_val(global("EXECSHELL")); 843 if (shell && *shell) 844 shell = search(shell, path, X_OK, (int *) 0); 845 if (!shell || !*shell) { 846 shell = p; 847 *tp->args-- = "/c"; 848 for (p = tp->str; *p; p++) 849 if (*p == '/') 850 *p = '\\'; 851 } 852 # endif /* OS2 */ 853 } 854 } 855 #endif /* SHARPBANG */ 856 *tp->args = shell; 857 858 ksh_execve(tp->args[0], tp->args, ap, 0); 859 860 /* report both the program that was run and the bogus shell */ 861 errorf("%s: %s: %s", tp->str, shell, strerror(errno)); 862 } 863 864 int 865 shcomexec(wp) 866 register char **wp; 867 { 868 register struct tbl *tp; 869 870 tp = tsearch(&builtins, *wp, hash(*wp)); 871 if (tp == NULL) 872 internal_errorf(1, "shcomexec: %s", *wp); 873 return call_builtin(tp, wp); 874 } 875 876 /* 877 * Search function tables for a function. If create set, a table entry 878 * is created if none is found. 879 */ 880 struct tbl * 881 findfunc(name, h, create) 882 const char *name; 883 unsigned int h; 884 int create; 885 { 886 struct block *l; 887 struct tbl *tp = (struct tbl *) 0; 888 889 for (l = e->loc; l; l = l->next) { 890 tp = tsearch(&l->funs, name, h); 891 if (tp) 892 break; 893 if (!l->next && create) { 894 tp = tenter(&l->funs, name, h); 895 tp->flag = DEFINED; 896 tp->type = CFUNC; 897 tp->val.t = (struct op *) 0; 898 break; 899 } 900 } 901 return tp; 902 } 903 904 /* 905 * define function. Returns 1 if function is being undefined (t == 0) and 906 * function did not exist, returns 0 otherwise. 907 */ 908 int 909 define(name, t) 910 const char *name; 911 struct op *t; 912 { 913 struct tbl *tp; 914 int was_set = 0; 915 916 while (1) { 917 tp = findfunc(name, hash(name), TRUE); 918 919 if (tp->flag & ISSET) 920 was_set = 1; 921 /* If this function is currently being executed, we zap this 922 * table entry so findfunc() won't see it 923 */ 924 if (tp->flag & FINUSE) { 925 tp->name[0] = '\0'; 926 tp->flag &= ~DEFINED; /* ensure it won't be found */ 927 tp->flag |= FDELETE; 928 } else 929 break; 930 } 931 932 if (tp->flag & ALLOC) { 933 tp->flag &= ~(ISSET|ALLOC); 934 tfree(tp->val.t, tp->areap); 935 } 936 937 if (t == NULL) { /* undefine */ 938 tdelete(tp); 939 return was_set ? 0 : 1; 940 } 941 942 tp->val.t = tcopy(t->left, tp->areap); 943 tp->flag |= (ISSET|ALLOC); 944 if (t->u.ksh_func) 945 tp->flag |= FKSH; 946 947 return 0; 948 } 949 950 /* 951 * add builtin 952 */ 953 void 954 builtin(name, func) 955 const char *name; 956 int (*func) ARGS((char **)); 957 { 958 register struct tbl *tp; 959 Tflag flag; 960 961 /* see if any flags should be set for this builtin */ 962 for (flag = 0; ; name++) { 963 if (*name == '=') /* command does variable assignment */ 964 flag |= KEEPASN; 965 else if (*name == '*') /* POSIX special builtin */ 966 flag |= SPEC_BI; 967 else if (*name == '+') /* POSIX regular builtin */ 968 flag |= REG_BI; 969 else 970 break; 971 } 972 973 tp = tenter(&builtins, name, hash(name)); 974 tp->flag = DEFINED | flag; 975 tp->type = CSHELL; 976 tp->val.f = func; 977 } 978 979 /* 980 * find command 981 * either function, hashed command, or built-in (in that order) 982 */ 983 struct tbl * 984 findcom(name, flags) 985 const char *name; 986 int flags; /* FC_* */ 987 { 988 static struct tbl temp; 989 unsigned int h = hash(name); 990 struct tbl *tp = NULL, *tbi; 991 int insert = Flag(FTRACKALL); /* insert if not found */ 992 char *fpath; /* for function autoloading */ 993 char *npath; 994 995 if (ksh_strchr_dirsep(name) != NULL) { 996 insert = 0; 997 /* prevent FPATH search below */ 998 flags &= ~FC_FUNC; 999 goto Search; 1000 } 1001 tbi = (flags & FC_BI) ? tsearch(&builtins, name, h) : NULL; 1002 /* POSIX says special builtins first, then functions, then 1003 * POSIX regular builtins, then search path... 1004 */ 1005 if ((flags & FC_SPECBI) && tbi && (tbi->flag & SPEC_BI)) 1006 tp = tbi; 1007 if (!tp && (flags & FC_FUNC)) { 1008 tp = findfunc(name, h, FALSE); 1009 if (tp && !(tp->flag & ISSET)) { 1010 if ((fpath = str_val(global("FPATH"))) == null) { 1011 tp->u.fpath = (char *) 0; 1012 tp->u2.errno_ = 0; 1013 } else 1014 tp->u.fpath = search(name, fpath, R_OK, 1015 &tp->u2.errno_); 1016 } 1017 } 1018 if (!tp && (flags & FC_REGBI) && tbi && (tbi->flag & REG_BI)) 1019 tp = tbi; 1020 /* todo: posix says non-special/non-regular builtins must 1021 * be triggered by some user-controllable means like a 1022 * special directory in PATH. Requires modifications to 1023 * the search() function. Tracked aliases should be 1024 * modified to allow tracking of builtin commands. 1025 * This should be under control of the FPOSIX flag. 1026 * If this is changed, also change c_whence... 1027 */ 1028 if (!tp && (flags & FC_UNREGBI) && tbi) 1029 tp = tbi; 1030 if (!tp && (flags & FC_PATH) && !(flags & FC_DEFPATH)) { 1031 tp = tsearch(&taliases, name, h); 1032 if (tp && (tp->flag & ISSET) && eaccess(tp->val.s, X_OK) != 0) { 1033 if (tp->flag & ALLOC) { 1034 tp->flag &= ~ALLOC; 1035 afree(tp->val.s, APERM); 1036 } 1037 tp->flag &= ~ISSET; 1038 } 1039 } 1040 1041 Search: 1042 if ((!tp || (tp->type == CTALIAS && !(tp->flag&ISSET))) 1043 && (flags & FC_PATH)) 1044 { 1045 if (!tp) { 1046 if (insert && !(flags & FC_DEFPATH)) { 1047 tp = tenter(&taliases, name, h); 1048 tp->type = CTALIAS; 1049 } else { 1050 tp = &temp; 1051 tp->type = CEXEC; 1052 } 1053 tp->flag = DEFINED; /* make ~ISSET */ 1054 } 1055 npath = search(name, flags & FC_DEFPATH ? def_path : path, 1056 X_OK, &tp->u2.errno_); 1057 if (npath) { 1058 tp->val.s = tp == &temp ? npath : str_save(npath, APERM); 1059 tp->flag |= ISSET|ALLOC; 1060 } else if ((flags & FC_FUNC) 1061 && (fpath = str_val(global("FPATH"))) != null 1062 && (npath = search(name, fpath, R_OK, 1063 &tp->u2.errno_)) != (char *) 0) 1064 { 1065 /* An undocumented feature of at&t ksh is that it 1066 * searches FPATH if a command is not found, even 1067 * if the command hasn't been set up as an autoloaded 1068 * function (ie, no typeset -uf). 1069 */ 1070 tp = &temp; 1071 tp->type = CFUNC; 1072 tp->flag = DEFINED; /* make ~ISSET */ 1073 tp->u.fpath = npath; 1074 } 1075 } 1076 return tp; 1077 } 1078 1079 /* 1080 * flush executable commands with relative paths 1081 */ 1082 void 1083 flushcom(all) 1084 int all; /* just relative or all */ 1085 { 1086 struct tbl *tp; 1087 struct tstate ts; 1088 1089 for (twalk(&ts, &taliases); (tp = tnext(&ts)) != NULL; ) 1090 if ((tp->flag&ISSET) && (all || !ISDIRSEP(tp->val.s[0]))) { 1091 if (tp->flag&ALLOC) { 1092 tp->flag &= ~(ALLOC|ISSET); 1093 afree(tp->val.s, APERM); 1094 } 1095 tp->flag &= ~ISSET; 1096 } 1097 } 1098 1099 /* Check if path is something we want to find. Returns -1 for failure. */ 1100 int 1101 search_access(path, mode, errnop) 1102 const char *path; 1103 int mode; 1104 int *errnop; /* set if candidate found, but not suitable */ 1105 { 1106 #ifndef OS2 1107 int ret, err = 0; 1108 struct stat statb; 1109 1110 if (stat(path, &statb) < 0) 1111 return -1; 1112 ret = eaccess(path, mode); 1113 if (ret < 0) 1114 err = errno; /* File exists, but we can't access it */ 1115 else if (mode == X_OK 1116 && (!S_ISREG(statb.st_mode) 1117 /* This 'cause access() says root can execute everything */ 1118 || !(statb.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))) 1119 { 1120 ret = -1; 1121 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1122 } 1123 if (err && errnop && !*errnop) 1124 *errnop = err; 1125 return ret; 1126 #else /* !OS2 */ 1127 /* 1128 * NOTE: ASSUMES path can be modified and has enough room at the 1129 * end of the string for a suffix (ie, 4 extra characters). 1130 * Certain code knows this (eg, eval.c(globit()), 1131 * exec.c(search())). 1132 */ 1133 static char *xsuffixes[] = { ".ksh", ".exe", ".", ".sh", ".cmd", 1134 ".com", ".bat", (char *) 0 1135 }; 1136 static char *rsuffixes[] = { ".ksh", ".", ".sh", ".cmd", ".bat", 1137 (char *) 0 1138 }; 1139 int i; 1140 char *mpath = (char *) path; 1141 char *tp = mpath + strlen(mpath); 1142 char *p; 1143 char **sfx; 1144 1145 /* If a suffix has been specified, check if it is one of the 1146 * suffixes that indicate the file is executable - if so, change 1147 * the access test to R_OK... 1148 * This code assumes OS/2 files can have only one suffix... 1149 */ 1150 if ((p = strrchr((p = ksh_strrchr_dirsep(mpath)) ? p : mpath, '.'))) { 1151 if (mode == X_OK) 1152 mode = R_OK; 1153 return search_access1(mpath, mode, errnop); 1154 } 1155 /* Try appending the various suffixes. Different suffixes for 1156 * read and execute 'cause we don't want to read an executable... 1157 */ 1158 sfx = mode == R_OK ? rsuffixes : xsuffixes; 1159 for (i = 0; sfx[i]; i++) { 1160 strcpy(tp, p = sfx[i]); 1161 if (search_access1(mpath, R_OK, errnop) == 0) 1162 return 0; 1163 *tp = '\0'; 1164 } 1165 return -1; 1166 #endif /* !OS2 */ 1167 } 1168 1169 #ifdef OS2 1170 static int 1171 search_access1(path, mode, errnop) 1172 const char *path; 1173 int mode; 1174 int *errnop; /* set if candidate found, but not suitable */ 1175 { 1176 int ret, err = 0; 1177 struct stat statb; 1178 1179 if (stat(path, &statb) < 0) 1180 return -1; 1181 ret = eaccess(path, mode); 1182 if (ret < 0) 1183 err = errno; /* File exists, but we can't access it */ 1184 else if (!S_ISREG(statb.st_mode)) { 1185 ret = -1; 1186 err = S_ISDIR(statb.st_mode) ? EISDIR : EACCES; 1187 } 1188 if (err && errnop && !*errnop) 1189 *errnop = err; 1190 return ret; 1191 } 1192 #endif /* OS2 */ 1193 1194 /* 1195 * search for command with PATH 1196 */ 1197 char * 1198 search(name, path, mode, errnop) 1199 const char *name; 1200 const char *path; 1201 int mode; /* R_OK or X_OK */ 1202 int *errnop; /* set if candidate found, but not suitable */ 1203 { 1204 const char *sp, *p; 1205 char *xp; 1206 XString xs; 1207 int namelen; 1208 1209 if (errnop) 1210 *errnop = 0; 1211 #ifdef OS2 1212 /* Xinit() allocates 8 additional bytes, so appended suffixes won't 1213 * overflow the memory. 1214 */ 1215 namelen = strlen(name) + 1; 1216 Xinit(xs, xp, namelen, ATEMP); 1217 memcpy(Xstring(xs, xp), name, namelen); 1218 1219 if (ksh_strchr_dirsep(name)) { 1220 if (search_access(Xstring(xs, xp), mode, errnop) >= 0) 1221 return Xstring(xs, xp); /* not Xclose() - see above */ 1222 Xfree(xs, xp); 1223 return NULL; 1224 } 1225 1226 /* Look in current context always. (os2 style) */ 1227 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1228 return Xstring(xs, xp); /* not Xclose() - xp may be wrong */ 1229 #else /* OS2 */ 1230 if (ksh_strchr_dirsep(name)) { 1231 if (search_access(name, mode, errnop) == 0) 1232 return (char *) name; 1233 return NULL; 1234 } 1235 1236 namelen = strlen(name) + 1; 1237 Xinit(xs, xp, 128, ATEMP); 1238 #endif /* OS2 */ 1239 1240 sp = path; 1241 while (sp != NULL) { 1242 xp = Xstring(xs, xp); 1243 if (!(p = strchr(sp, PATHSEP))) 1244 p = sp + strlen(sp); 1245 if (p != sp) { 1246 XcheckN(xs, xp, p - sp); 1247 memcpy(xp, sp, p - sp); 1248 xp += p - sp; 1249 *xp++ = DIRSEP; 1250 } 1251 sp = p; 1252 XcheckN(xs, xp, namelen); 1253 memcpy(xp, name, namelen); 1254 if (search_access(Xstring(xs, xp), mode, errnop) == 0) 1255 #ifdef OS2 1256 return Xstring(xs, xp); /* Not Xclose() - see above */ 1257 #else /* OS2 */ 1258 return Xclose(xs, xp + namelen); 1259 #endif /* OS2 */ 1260 if (*sp++ == '\0') 1261 sp = NULL; 1262 } 1263 Xfree(xs, xp); 1264 return NULL; 1265 } 1266 1267 static int 1268 call_builtin(tp, wp) 1269 struct tbl *tp; 1270 char **wp; 1271 { 1272 int rv; 1273 1274 builtin_argv0 = wp[0]; 1275 builtin_flag = tp->flag; 1276 shf_reopen(1, SHF_WR, shl_stdout); 1277 shl_stdout_ok = 1; 1278 ksh_getopt_reset(&builtin_opt, GF_ERROR); 1279 rv = (*tp->val.f)(wp); 1280 shf_flush(shl_stdout); 1281 shl_stdout_ok = 0; 1282 builtin_flag = 0; 1283 builtin_argv0 = (char *) 0; 1284 return rv; 1285 } 1286 1287 /* 1288 * set up redirection, saving old fd's in e->savefd 1289 */ 1290 static int 1291 iosetup(iop, tp) 1292 register struct ioword *iop; 1293 struct tbl *tp; 1294 { 1295 register int u = -1; 1296 char *cp = iop->name; 1297 int iotype = iop->flag & IOTYPE; 1298 int do_open = 1, do_close = 0, UNINITIALIZED(flags); 1299 struct ioword iotmp; 1300 struct stat statb; 1301 1302 if (iotype != IOHERE) 1303 cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0)); 1304 1305 /* Used for tracing and error messages to print expanded cp */ 1306 iotmp = *iop; 1307 iotmp.name = (iotype == IOHERE) ? (char *) 0 : cp; 1308 iotmp.flag |= IONAMEXP; 1309 1310 if (Flag(FXTRACE)) 1311 shellf("%s%s\n", 1312 PS4_SUBSTITUTE(str_val(global("PS4"))), 1313 snptreef((char *) 0, 32, "%R", &iotmp)); 1314 1315 switch (iotype) { 1316 case IOREAD: 1317 flags = O_RDONLY; 1318 break; 1319 1320 case IOCAT: 1321 flags = O_WRONLY | O_APPEND | O_CREAT; 1322 break; 1323 1324 case IOWRITE: 1325 flags = O_WRONLY | O_CREAT | O_TRUNC; 1326 /* The stat() is here to allow redirections to 1327 * things like /dev/null without error. 1328 */ 1329 if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) 1330 && (stat(cp, &statb) < 0 || S_ISREG(statb.st_mode))) 1331 flags |= O_EXCL; 1332 break; 1333 1334 case IORDWR: 1335 flags = O_RDWR | O_CREAT; 1336 break; 1337 1338 case IOHERE: 1339 do_open = 0; 1340 /* herein() returns -2 if error has been printed */ 1341 u = herein(iop->heredoc, iop->flag & IOEVAL); 1342 /* cp may have wrong name */ 1343 break; 1344 1345 case IODUP: 1346 { 1347 const char *emsg; 1348 1349 do_open = 0; 1350 if (*cp == '-' && !cp[1]) { 1351 u = 1009; /* prevent error return below */ 1352 do_close = 1; 1353 } else if ((u = check_fd(cp, 1354 X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK), 1355 &emsg)) < 0) 1356 { 1357 warningf(TRUE, "%s: %s", 1358 snptreef((char *) 0, 32, "%R", &iotmp), emsg); 1359 return -1; 1360 } 1361 break; 1362 } 1363 } 1364 if (do_open) { 1365 if (Flag(FRESTRICTED) && (flags & O_CREAT)) { 1366 warningf(TRUE, "%s: restricted", cp); 1367 return -1; 1368 } 1369 u = open(cp, flags, 0666); 1370 #ifdef OS2 1371 if (u < 0 && strcmp(cp, "/dev/null") == 0) 1372 u = open("nul", flags, 0666); 1373 #endif /* OS2 */ 1374 } 1375 if (u < 0) { 1376 /* herein() may already have printed message */ 1377 if (u == -1) 1378 warningf(TRUE, "cannot %s %s: %s", 1379 iotype == IODUP ? "dup" 1380 : (iotype == IOREAD || iotype == IOHERE) ? 1381 "open" : "create", cp, strerror(errno)); 1382 return -1; 1383 } 1384 /* Do not save if it has already been redirected (i.e. "cat >x >y"). */ 1385 if (e->savefd[iop->unit] == 0) 1386 /* c_exec() assumes e->savefd[fd] set for any redirections. 1387 * Ask savefd() not to close iop->unit - allows error messages 1388 * to be seen if iop->unit is 2; also means we can't lose 1389 * the fd (eg, both dup2 below and dup2 in restfd() failing). 1390 */ 1391 e->savefd[iop->unit] = savefd(iop->unit, 1); 1392 1393 if (do_close) 1394 close(iop->unit); 1395 else if (u != iop->unit) { 1396 if (ksh_dup2(u, iop->unit, TRUE) < 0) { 1397 warningf(TRUE, 1398 "could not finish (dup) redirection %s: %s", 1399 snptreef((char *) 0, 32, "%R", &iotmp), 1400 strerror(errno)); 1401 if (iotype != IODUP) 1402 close(u); 1403 return -1; 1404 } 1405 if (iotype != IODUP) 1406 close(u); 1407 #ifdef KSH 1408 /* Touching any co-process fd in an empty exec 1409 * causes the shell to close its copies 1410 */ 1411 else if (tp && tp->type == CSHELL && tp->val.f == c_exec) { 1412 if (iop->flag & IORDUP) /* possible exec <&p */ 1413 coproc_read_close(u); 1414 else /* possible exec >&p */ 1415 coproc_write_close(u); 1416 } 1417 #endif /* KSH */ 1418 } 1419 if (u == 2) /* Clear any write errors */ 1420 shf_reopen(2, SHF_WR, shl_out); 1421 return 0; 1422 } 1423 1424 /* 1425 * open here document temp file. 1426 * if unquoted here, expand here temp file into second temp file. 1427 */ 1428 static int 1429 herein(content, sub) 1430 const char *content; 1431 int sub; 1432 { 1433 volatile int fd = -1; 1434 struct source *s, *volatile osource; 1435 struct shf *volatile shf; 1436 struct temp *h; 1437 int i; 1438 1439 /* ksh -c 'cat << EOF' can cause this... */ 1440 if (content == (char *) 0) { 1441 warningf(TRUE, "here document missing"); 1442 return -2; /* special to iosetup(): don't print error */ 1443 } 1444 1445 /* Create temp file to hold content (done before newenv so temp 1446 * doesn't get removed too soon). 1447 */ 1448 h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps); 1449 if (!(shf = h->shf) || (fd = open(h->name, O_RDONLY, 0)) < 0) { 1450 warningf(TRUE, "can't %s temporary file %s: %s", 1451 !shf ? "create" : "open", 1452 h->name, strerror(errno)); 1453 if (shf) 1454 shf_close(shf); 1455 return -2 /* special to iosetup(): don't print error */; 1456 } 1457 1458 osource = source; 1459 newenv(E_ERRH); 1460 i = ksh_sigsetjmp(e->jbuf, 0); 1461 if (i) { 1462 source = osource; 1463 quitenv(); 1464 shf_close(shf); /* after quitenv */ 1465 close(fd); 1466 return -2; /* special to iosetup(): don't print error */ 1467 } 1468 if (sub) { 1469 /* Do substitutions on the content of heredoc */ 1470 s = pushs(SSTRING, ATEMP); 1471 s->start = s->str = content; 1472 source = s; 1473 if (yylex(ONEWORD) != LWORD) 1474 internal_errorf(1, "herein: yylex"); 1475 source = osource; 1476 shf_puts(evalstr(yylval.cp, 0), shf); 1477 } else 1478 shf_puts(content, shf); 1479 1480 quitenv(); 1481 1482 if (shf_close(shf) == EOF) { 1483 close(fd); 1484 warningf(TRUE, "error writing %s: %s", h->name, 1485 strerror(errno)); 1486 return -2; /* special to iosetup(): don't print error */ 1487 } 1488 1489 return fd; 1490 } 1491 1492 #ifdef KSH 1493 /* 1494 * ksh special - the select command processing section 1495 * print the args in column form - assuming that we can 1496 */ 1497 static char * 1498 do_selectargs(ap, print_menu) 1499 register char **ap; 1500 bool_t print_menu; 1501 { 1502 static const char *const read_args[] = { 1503 "read", "-r", "REPLY", (char *) 0 1504 }; 1505 char *s; 1506 int i, argct; 1507 1508 for (argct = 0; ap[argct]; argct++) 1509 ; 1510 while (1) { 1511 /* Menu is printed if 1512 * - this is the first time around the select loop 1513 * - the user enters a blank line 1514 * - the REPLY parameter is empty 1515 */ 1516 if (print_menu || !*str_val(global("REPLY"))) 1517 pr_menu(ap); 1518 shellf("%s", str_val(global("PS3"))); 1519 if (call_builtin(findcom("read", FC_BI), (char **) read_args)) 1520 return (char *) 0; 1521 s = str_val(global("REPLY")); 1522 if (*s) { 1523 i = atoi(s); 1524 return (i >= 1 && i <= argct) ? ap[i - 1] : null; 1525 } 1526 print_menu = 1; 1527 } 1528 } 1529 1530 struct select_menu_info { 1531 char *const *args; 1532 int arg_width; 1533 int num_width; 1534 } info; 1535 1536 static char *select_fmt_entry ARGS((void *arg, int i, char *buf, int buflen)); 1537 1538 /* format a single select menu item */ 1539 static char * 1540 select_fmt_entry(arg, i, buf, buflen) 1541 void *arg; 1542 int i; 1543 char *buf; 1544 int buflen; 1545 { 1546 struct select_menu_info *smi = (struct select_menu_info *) arg; 1547 1548 shf_snprintf(buf, buflen, "%*d) %s", 1549 smi->num_width, i + 1, smi->args[i]); 1550 return buf; 1551 } 1552 1553 /* 1554 * print a select style menu 1555 */ 1556 int 1557 pr_menu(ap) 1558 char *const *ap; 1559 { 1560 struct select_menu_info smi; 1561 char *const *pp; 1562 int nwidth, dwidth; 1563 int i, n; 1564 1565 /* Width/column calculations were done once and saved, but this 1566 * means select can't be used recursively so we re-calculate each 1567 * time (could save in a structure that is returned, but its probably 1568 * not worth the bother). 1569 */ 1570 1571 /* 1572 * get dimensions of the list 1573 */ 1574 for (n = 0, nwidth = 0, pp = ap; *pp; n++, pp++) { 1575 i = strlen(*pp); 1576 nwidth = (i > nwidth) ? i : nwidth; 1577 } 1578 /* 1579 * we will print an index of the form 1580 * %d) 1581 * in front of each entry 1582 * get the max width of this 1583 */ 1584 for (i = n, dwidth = 1; i >= 10; i /= 10) 1585 dwidth++; 1586 1587 smi.args = ap; 1588 smi.arg_width = nwidth; 1589 smi.num_width = dwidth; 1590 print_columns(shl_out, n, select_fmt_entry, (void *) &smi, 1591 dwidth + nwidth + 2); 1592 1593 return n; 1594 } 1595 #endif /* KSH */ 1596 #ifdef KSH 1597 1598 /* 1599 * [[ ... ]] evaluation routines 1600 */ 1601 1602 extern const char *const dbtest_tokens[]; 1603 extern const char db_close[]; 1604 1605 /* Test if the current token is a whatever. Accepts the current token if 1606 * it is. Returns 0 if it is not, non-zero if it is (in the case of 1607 * TM_UNOP and TM_BINOP, the returned value is a Test_op). 1608 */ 1609 static int 1610 dbteste_isa(te, meta) 1611 Test_env *te; 1612 Test_meta meta; 1613 { 1614 int ret = 0; 1615 int uqword; 1616 char *p; 1617 1618 if (!*te->pos.wp) 1619 return meta == TM_END; 1620 1621 /* unquoted word? */ 1622 for (p = *te->pos.wp; *p == CHAR; p += 2) 1623 ; 1624 uqword = *p == EOS; 1625 1626 if (meta == TM_UNOP || meta == TM_BINOP) { 1627 if (uqword) { 1628 char buf[8]; /* longer than the longest operator */ 1629 char *q = buf; 1630 for (p = *te->pos.wp; *p == CHAR 1631 && q < &buf[sizeof(buf) - 1]; 1632 p += 2) 1633 *q++ = p[1]; 1634 *q = '\0'; 1635 ret = (int) test_isop(te, meta, buf); 1636 } 1637 } else if (meta == TM_END) 1638 ret = 0; 1639 else 1640 ret = uqword 1641 && strcmp(*te->pos.wp, dbtest_tokens[(int) meta]) == 0; 1642 1643 /* Accept the token? */ 1644 if (ret) 1645 te->pos.wp++; 1646 1647 return ret; 1648 } 1649 1650 static const char * 1651 dbteste_getopnd(te, op, do_eval) 1652 Test_env *te; 1653 Test_op op; 1654 int do_eval; 1655 { 1656 char *s = *te->pos.wp; 1657 1658 if (!s) 1659 return (char *) 0; 1660 1661 te->pos.wp++; 1662 1663 if (!do_eval) 1664 return null; 1665 1666 if (op == TO_STEQL || op == TO_STNEQ) 1667 s = evalstr(s, DOTILDE | DOPAT); 1668 else 1669 s = evalstr(s, DOTILDE); 1670 1671 return s; 1672 } 1673 1674 static int 1675 dbteste_eval(te, op, opnd1, opnd2, do_eval) 1676 Test_env *te; 1677 Test_op op; 1678 const char *opnd1; 1679 const char *opnd2; 1680 int do_eval; 1681 { 1682 return test_eval(te, op, opnd1, opnd2, do_eval); 1683 } 1684 1685 static void 1686 dbteste_error(te, offset, msg) 1687 Test_env *te; 1688 int offset; 1689 const char *msg; 1690 { 1691 te->flags |= TEF_ERROR; 1692 internal_errorf(0, "dbteste_error: %s (offset %d)", msg, offset); 1693 } 1694 #endif /* KSH */ 1695