kernel - Deal with lost IPIs (VM related)
[dragonfly.git] / contrib / tcsh-6 / sh.exp.c
blob16a966b10136af58eda88672c77203a60ed41573
1 /* $Header: /p/tcsh/cvsroot/tcsh/sh.exp.c,v 3.61 2012/11/28 13:45:11 christos Exp $ */
2 /*
3 * sh.exp.c: Expression evaluations
4 */
5 /*-
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
7 * All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
33 #include "sh.h"
35 RCSID("$tcsh: sh.exp.c,v 3.61 2012/11/28 13:45:11 christos Exp $")
37 #include "tw.h"
40 * C shell
43 #define TEXP_IGNORE 1 /* in ignore, it means to ignore value, just parse */
44 #define TEXP_NOGLOB 2 /* in ignore, it means not to globone */
46 #define ADDOP 1
47 #define MULOP 2
48 #define EQOP 4
49 #define RELOP 8
50 #define RESTOP 16
51 #define ANYOP 31
53 #define EQEQ 1
54 #define GTR 2
55 #define LSS 4
56 #define NOTEQ 6
57 #define EQMATCH 7
58 #define NOTEQMATCH 8
60 static int sh_access (const Char *, int);
61 static tcsh_number_t exp1 (Char ***, int);
62 static tcsh_number_t exp2x (Char ***, int);
63 static tcsh_number_t exp2a (Char ***, int);
64 static tcsh_number_t exp2b (Char ***, int);
65 static tcsh_number_t exp2c (Char ***, int);
66 static Char *exp3 (Char ***, int);
67 static Char *exp3a (Char ***, int);
68 static Char *exp4 (Char ***, int);
69 static Char *exp5 (Char ***, int);
70 static Char *exp6 (Char ***, int);
71 static void evalav (Char **);
72 static int isa (Char *, int);
73 static tcsh_number_t egetn (const Char *);
75 #ifdef EDEBUG
76 static void etracc (const char *, const Char *, Char ***);
77 static void etraci (const char *, tcsh_number_t, Char ***);
78 #else /* !EDEBUG */
79 #define etracc(A, B, C) ((void)0)
80 #define etraci(A, B, C) ((void)0)
81 #endif /* !EDEBUG */
84 * shell access function according to POSIX and non POSIX
85 * From Beto Appleton (beto@aixwiz.aix.ibm.com)
87 static int
88 sh_access(const Char *fname, int mode)
90 #if defined(POSIX) && !defined(USE_ACCESS)
91 struct stat statb;
92 #endif /* POSIX */
93 char *name = short2str(fname);
95 if (*name == '\0')
96 return 1;
98 #if !defined(POSIX) || defined(USE_ACCESS)
99 return access(name, mode);
100 #else /* POSIX */
103 * POSIX 1003.2-d11.2
104 * -r file True if file exists and is readable.
105 * -w file True if file exists and is writable.
106 * True shall indicate only that the write flag is on.
107 * The file shall not be writable on a read-only file
108 * system even if this test indicates true.
109 * -x file True if file exists and is executable.
110 * True shall indicate only that the execute flag is on.
111 * If file is a directory, true indicates that the file
112 * can be searched.
114 if (mode != W_OK && mode != X_OK)
115 return access(name, mode);
117 if (stat(name, &statb) == -1)
118 return 1;
120 if (access(name, mode) == 0) {
121 #ifdef S_ISDIR
122 if (S_ISDIR(statb.st_mode) && mode == X_OK)
123 return 0;
124 #endif /* S_ISDIR */
126 /* root needs permission for someone */
127 switch (mode) {
128 case W_OK:
129 mode = S_IWUSR | S_IWGRP | S_IWOTH;
130 break;
131 case X_OK:
132 mode = S_IXUSR | S_IXGRP | S_IXOTH;
133 break;
134 default:
135 abort();
136 break;
141 else if (euid == statb.st_uid)
142 mode <<= 6;
144 else if (egid == statb.st_gid)
145 mode <<= 3;
147 # ifdef NGROUPS_MAX
148 else {
149 /* you can be in several groups */
150 long n;
151 GETGROUPS_T *groups;
154 * Try these things to find a positive maximum groups value:
155 * 1) sysconf(_SC_NGROUPS_MAX)
156 * 2) NGROUPS_MAX
157 * 3) getgroups(0, unused)
158 * Then allocate and scan the groups array if one of these worked.
160 # if defined (HAVE_SYSCONF) && defined (_SC_NGROUPS_MAX)
161 if ((n = sysconf(_SC_NGROUPS_MAX)) == -1)
162 # endif /* _SC_NGROUPS_MAX */
163 n = NGROUPS_MAX;
164 if (n <= 0)
165 n = getgroups(0, (GETGROUPS_T *) NULL);
167 if (n > 0) {
168 groups = xmalloc(n * sizeof(*groups));
169 n = getgroups((int) n, groups);
170 while (--n >= 0)
171 if (groups[n] == statb.st_gid) {
172 mode <<= 3;
173 break;
175 xfree(groups);
178 # endif /* NGROUPS_MAX */
180 if (statb.st_mode & mode)
181 return 0;
182 else
183 return 1;
184 #endif /* !POSIX */
187 tcsh_number_t
188 expr(Char ***vp)
190 return (exp0(vp, 0));
193 tcsh_number_t
194 exp0(Char ***vp, int ignore)
196 tcsh_number_t p1 = exp1(vp, ignore);
198 etraci("exp0 p1", p1, vp);
199 while (**vp && eq(**vp, STRor2)) {
200 int p2;
202 (*vp)++;
204 p2 = compat_expr ?
205 exp0(vp, (ignore & TEXP_IGNORE) || p1) :
206 exp1(vp, (ignore & TEXP_IGNORE) || p1);
207 if (compat_expr || !(ignore & TEXP_IGNORE))
208 p1 = (p1 || p2);
209 etraci("exp0 p1", p1, vp);
210 if (compat_expr)
211 break;
213 return (p1);
216 static tcsh_number_t
217 exp1(Char ***vp, int ignore)
219 tcsh_number_t p1 = exp2x(vp, ignore);
221 etraci("exp1 p1", p1, vp);
222 while (**vp && eq(**vp, STRand2)) {
223 tcsh_number_t p2;
225 (*vp)++;
226 p2 = compat_expr ?
227 exp1(vp, (ignore & TEXP_IGNORE) || !p1) :
228 exp2x(vp, (ignore & TEXP_IGNORE) || !p1);
230 etraci("exp1 p2", p2, vp);
231 if (compat_expr || !(ignore & TEXP_IGNORE))
232 p1 = (p1 && p2);
233 etraci("exp1 p1", p1, vp);
234 if (compat_expr)
235 break;
237 return (p1);
240 static tcsh_number_t
241 exp2x(Char ***vp, int ignore)
243 tcsh_number_t p1 = exp2a(vp, ignore);
245 etraci("exp2x p1", p1, vp);
246 while (**vp && eq(**vp, STRor)) {
247 tcsh_number_t p2;
249 (*vp)++;
250 p2 = compat_expr ?
251 exp2x(vp, ignore) :
252 exp2a(vp, ignore);
253 etraci("exp2x p2", p2, vp);
254 if (compat_expr || !(ignore & TEXP_IGNORE))
255 p1 = (p1 | p2);
256 etraci("exp2x p1", p1, vp);
257 if (compat_expr)
258 break;
260 return (p1);
263 static tcsh_number_t
264 exp2a(Char ***vp, int ignore)
266 tcsh_number_t p1 = exp2b(vp, ignore);
268 etraci("exp2a p1", p1, vp);
269 while (**vp && eq(**vp, STRcaret)) {
270 tcsh_number_t p2;
272 (*vp)++;
273 p2 = compat_expr ?
274 exp2a(vp, ignore) :
275 exp2b(vp, ignore);
276 etraci("exp2a p2", p2, vp);
277 if (compat_expr || !(ignore & TEXP_IGNORE))
278 p1 = (p1 ^ p2);
279 etraci("exp2a p1", p1, vp);
280 if (compat_expr)
281 break;
283 return (p1);
286 static tcsh_number_t
287 exp2b(Char ***vp, int ignore)
289 tcsh_number_t p1 = exp2c(vp, ignore);
291 etraci("exp2b p1", p1, vp);
292 while (**vp && eq(**vp, STRand)) {
293 tcsh_number_t p2;
295 (*vp)++;
296 p2 = compat_expr ?
297 exp2b(vp, ignore) :
298 exp2c(vp, ignore);
299 etraci("exp2b p2", p2, vp);
300 if (compat_expr || !(ignore & TEXP_IGNORE))
301 p1 = (p1 & p2);
302 etraci("exp2b p1", p1, vp);
303 if (compat_expr)
304 break;
306 return (p1);
309 static tcsh_number_t
310 exp2c(Char ***vp, int ignore)
312 Char *p1 = exp3(vp, ignore);
313 Char *p2;
314 tcsh_number_t i;
316 cleanup_push(p1, xfree);
317 etracc("exp2c p1", p1, vp);
318 if ((i = isa(**vp, EQOP)) != 0) {
319 (*vp)++;
320 if (i == EQMATCH || i == NOTEQMATCH)
321 ignore |= TEXP_NOGLOB;
322 p2 = exp3(vp, ignore);
323 cleanup_push(p2, xfree);
324 etracc("exp2c p2", p2, vp);
325 if (!(ignore & TEXP_IGNORE))
326 switch ((int)i) {
328 case EQEQ:
329 i = eq(p1, p2);
330 break;
332 case NOTEQ:
333 i = !eq(p1, p2);
334 break;
336 case EQMATCH:
337 i = Gmatch(p1, p2);
338 break;
340 case NOTEQMATCH:
341 i = !Gmatch(p1, p2);
342 break;
344 cleanup_until(p1);
345 return (i);
347 i = egetn(p1);
348 cleanup_until(p1);
349 return (i);
352 static Char *
353 exp3(Char ***vp, int ignore)
355 Char *p1, *p2;
356 tcsh_number_t i;
358 p1 = exp3a(vp, ignore);
359 etracc("exp3 p1", p1, vp);
360 while ((i = isa(**vp, RELOP)) != 0) {
361 (*vp)++;
362 if (**vp && eq(**vp, STRequal))
363 i |= 1, (*vp)++;
364 cleanup_push(p1, xfree);
365 p2 = compat_expr ?
366 exp3(vp, ignore) :
367 exp3a(vp, ignore);
368 cleanup_push(p2, xfree);
369 etracc("exp3 p2", p2, vp);
370 if (!(ignore & TEXP_IGNORE))
371 switch ((int)i) {
373 case GTR:
374 i = egetn(p1) > egetn(p2);
375 break;
377 case GTR | 1:
378 i = egetn(p1) >= egetn(p2);
379 break;
381 case LSS:
382 i = egetn(p1) < egetn(p2);
383 break;
385 case LSS | 1:
386 i = egetn(p1) <= egetn(p2);
387 break;
389 cleanup_until(p1);
390 p1 = putn(i);
391 etracc("exp3 p1", p1, vp);
392 if (compat_expr)
393 break;
395 return (p1);
398 static Char *
399 exp3a(Char ***vp, int ignore)
401 Char *p1, *p2;
402 const Char *op;
403 tcsh_number_t i;
405 p1 = exp4(vp, ignore);
406 etracc("exp3a p1", p1, vp);
407 op = **vp;
408 if (op && any("<>", op[0]) && op[0] == op[1]) {
409 (*vp)++;
410 cleanup_push(p1, xfree);
411 p2 = compat_expr ?
412 exp3a(vp, ignore) :
413 exp4(vp, ignore);
414 cleanup_push(p2, xfree);
415 etracc("exp3a p2", p2, vp);
416 if (op[0] == '<')
417 i = egetn(p1) << egetn(p2);
418 else
419 i = egetn(p1) >> egetn(p2);
420 cleanup_until(p1);
421 p1 = putn(i);
422 etracc("exp3a p1", p1, vp);
424 return (p1);
427 static Char *
428 exp4(Char ***vp, int ignore)
430 Char *p1, *p2;
431 tcsh_number_t i = 0;
433 p1 = exp5(vp, ignore);
434 etracc("exp4 p1", p1, vp);
435 while (isa(**vp, ADDOP)) {
436 const Char *op = *(*vp)++;
438 cleanup_push(p1, xfree);
439 p2 = compat_expr ?
440 exp4(vp, ignore) :
441 exp5(vp, ignore);
442 cleanup_push(p2, xfree);
443 etracc("exp4 p2", p2, vp);
444 if (!(ignore & TEXP_IGNORE))
445 switch (op[0]) {
447 case '+':
448 i = egetn(p1) + egetn(p2);
449 break;
451 case '-':
452 i = egetn(p1) - egetn(p2);
453 break;
455 cleanup_until(p1);
456 p1 = putn(i);
457 etracc("exp4 p1", p1, vp);
458 if (compat_expr)
459 break;
461 return (p1);
464 static Char *
465 exp5(Char ***vp, int ignore)
467 Char *p1, *p2;
468 tcsh_number_t i = 0;
470 p1 = exp6(vp, ignore);
471 etracc("exp5 p1", p1, vp);
473 while (isa(**vp, MULOP)) {
474 const Char *op = *(*vp)++;
475 if ((ignore & TEXP_NOGLOB) != 0) {
477 * We are just trying to get the right side of
478 * a =~ or !~ operator
480 xfree(p1);
481 return Strsave(op);
484 cleanup_push(p1, xfree);
485 p2 = compat_expr ?
486 exp5(vp, ignore) :
487 exp6(vp, ignore);
488 cleanup_push(p2, xfree);
489 etracc("exp5 p2", p2, vp);
490 if (!(ignore & TEXP_IGNORE))
491 switch (op[0]) {
493 case '*':
494 i = egetn(p1) * egetn(p2);
495 break;
497 case '/':
498 i = egetn(p2);
499 if (i == 0)
500 stderror(ERR_DIV0);
501 i = egetn(p1) / i;
502 break;
504 case '%':
505 i = egetn(p2);
506 if (i == 0)
507 stderror(ERR_MOD0);
508 i = egetn(p1) % i;
509 break;
511 cleanup_until(p1);
512 p1 = putn(i);
513 etracc("exp5 p1", p1, vp);
514 if (compat_expr)
515 break;
517 return (p1);
520 static Char *
521 exp6(Char ***vp, int ignore)
523 tcsh_number_t ccode;
524 tcsh_number_t i = 0;
525 Char *cp;
527 if (**vp == 0)
528 stderror(ERR_NAME | ERR_EXPRESSION);
529 if (eq(**vp, STRbang)) {
530 (*vp)++;
531 cp = exp6(vp, ignore);
532 cleanup_push(cp, xfree);
533 etracc("exp6 ! cp", cp, vp);
534 i = egetn(cp);
535 cleanup_until(cp);
536 return (putn(!i));
538 if (eq(**vp, STRtilde)) {
539 (*vp)++;
540 cp = exp6(vp, ignore);
541 cleanup_push(cp, xfree);
542 etracc("exp6 ~ cp", cp, vp);
543 i = egetn(cp);
544 cleanup_until(cp);
545 return (putn(~i));
547 if (eq(**vp, STRLparen)) {
548 (*vp)++;
549 ccode = exp0(vp, ignore);
550 etraci("exp6 () ccode", ccode, vp);
551 if (**vp == 0 || ***vp != ')')
552 stderror(ERR_NAME | ERR_EXPRESSION);
553 (*vp)++;
554 return (putn(ccode));
556 if (eq(**vp, STRLbrace)) {
557 Char **v;
558 struct command faket;
559 Char *fakecom[2];
561 faket.t_dtyp = NODE_COMMAND;
562 faket.t_dflg = F_BACKQ;
563 faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
564 faket.t_dcom = fakecom;
565 fakecom[0] = STRfakecom;
566 fakecom[1] = NULL;
567 (*vp)++;
568 v = *vp;
569 for (;;) {
570 if (!**vp)
571 stderror(ERR_NAME | ERR_MISSING, '}');
572 if (eq(*(*vp)++, STRRbrace))
573 break;
575 if (ignore & TEXP_IGNORE)
576 return (Strsave(STRNULL));
577 psavejob();
578 cleanup_push(&faket, psavejob_cleanup); /* faket is only a marker */
579 if (pfork(&faket, -1) == 0) {
580 *--(*vp) = 0;
581 evalav(v);
582 exitstat();
584 pwait();
585 cleanup_until(&faket);
586 etraci("exp6 {} status", egetn(varval(STRstatus)), vp);
587 return (putn(egetn(varval(STRstatus)) == 0));
589 if (isa(**vp, ANYOP))
590 return (Strsave(STRNULL));
591 cp = *(*vp)++;
592 #ifdef convex
593 # define FILETESTS "erwxfdzoplstSXLbcugkmKR"
594 #else
595 # define FILETESTS "erwxfdzoplstSXLbcugkmK"
596 #endif /* convex */
597 #define FILEVALS "ZAMCDIUGNFPL"
598 if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1])))
599 return(filetest(cp, vp, ignore));
600 etracc("exp6 default", cp, vp);
601 return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND));
606 * Extended file tests
607 * From: John Rowe <rowe@excc.exeter.ac.uk>
609 Char *
610 filetest(Char *cp, Char ***vp, int ignore)
612 #ifdef convex
613 struct cvxstat stb, *st = NULL;
614 # define TCSH_STAT stat64
615 #else
616 # define TCSH_STAT stat
617 struct stat stb, *st = NULL;
618 #endif /* convex */
620 #ifdef S_IFLNK
621 # ifdef convex
622 struct cvxstat lstb, *lst = NULL;
623 # define TCSH_LSTAT lstat64
624 # else
625 # define TCSH_LSTAT lstat
626 struct stat lstb, *lst = NULL;
627 # endif /* convex */
628 char *filnam;
629 #endif /* S_IFLNK */
631 tcsh_number_t i = 0;
632 unsigned pmask = 0xffff;
633 int altout = 0;
634 Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0',
635 *errval = STR0;
636 char *string, string0[22 + MB_LEN_MAX + 1]; /* space for 64 bit octal */
637 time_t footime;
638 struct passwd *pw;
639 struct group *gr;
641 while(any(FILETESTS, *++ft))
642 continue;
644 if (!*ft && *(ft - 1) == 'L')
645 --ft;
647 if (any(FILEVALS, *ft)) {
648 valtest = *ft++;
650 * Value tests return '-1' on failure as 0 is
651 * a legitimate value for many of them.
652 * 'F' returns ':' for compatibility.
654 errval = valtest == 'F' ? STRcolon : STRminus1;
656 if (valtest == 'P' && *ft >= '0' && *ft <= '7') {
657 pmask = (char) *ft - '0';
658 while ( *++ft >= '0' && *ft <= '7' )
659 pmask = 8 * pmask + ((char) *ft - '0');
661 if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) {
662 altout = 1;
663 ++ft;
667 if (*ft || ft == cp + 1)
668 stderror(ERR_NAME | ERR_FILEINQ);
671 * Detect missing file names by checking for operator in the file name
672 * position. However, if an operator name appears there, we must make
673 * sure that there's no file by that name (e.g., "/") before announcing
674 * an error. Even this check isn't quite right, since it doesn't take
675 * globbing into account.
678 if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb))
679 stderror(ERR_NAME | ERR_FILENAME);
681 dp = *(*vp)++;
682 if (ignore & TEXP_IGNORE)
683 return (Strsave(STRNULL));
684 ep = globone(dp, G_APPEND);
685 cleanup_push(ep, xfree);
686 ft = &cp[1];
688 switch (*ft) {
690 case 'r':
691 i = !sh_access(ep, R_OK);
692 break;
694 case 'w':
695 i = !sh_access(ep, W_OK);
696 break;
698 case 'x':
699 i = !sh_access(ep, X_OK);
700 break;
702 case 'X': /* tcsh extension, name is an executable in the path
703 * or a tcsh builtin command
705 i = find_cmd(ep, 0);
706 break;
708 case 't': /* SGI extension, true when file is a tty */
709 i = isatty(atoi(short2str(ep)));
710 break;
712 default:
714 #ifdef S_IFLNK
715 if (tolower(*ft) == 'l') {
717 * avoid convex compiler bug.
719 if (!lst) {
720 lst = &lstb;
721 if (TCSH_LSTAT(short2str(ep), lst) == -1) {
722 cleanup_until(ep);
723 return (Strsave(errval));
726 if (*ft == 'L')
727 st = lst;
729 else
730 #endif /* S_IFLNK */
732 * avoid convex compiler bug.
734 if (!st) {
735 st = &stb;
736 if (TCSH_STAT(short2str(ep), st) == -1) {
737 cleanup_until(ep);
738 return (Strsave(errval));
742 switch (*ft) {
744 case 'f':
745 #ifdef S_ISREG
746 i = S_ISREG(st->st_mode);
747 #else /* !S_ISREG */
748 i = 0;
749 #endif /* S_ISREG */
750 break;
752 case 'd':
753 #ifdef S_ISDIR
754 i = S_ISDIR(st->st_mode);
755 #else /* !S_ISDIR */
756 i = 0;
757 #endif /* S_ISDIR */
758 break;
760 case 'p':
761 #ifdef S_ISFIFO
762 i = S_ISFIFO(st->st_mode);
763 #else /* !S_ISFIFO */
764 i = 0;
765 #endif /* S_ISFIFO */
766 break;
768 case 'm' :
769 #ifdef S_ISOFL
770 i = S_ISOFL(st->st_dm_mode);
771 #else /* !S_ISOFL */
772 i = 0;
773 #endif /* S_ISOFL */
774 break ;
776 case 'K' :
777 #ifdef S_ISOFL
778 i = stb.st_dm_key;
779 #else /* !S_ISOFL */
780 i = 0;
781 #endif /* S_ISOFL */
782 break ;
785 case 'l':
786 #ifdef S_ISLNK
787 i = S_ISLNK(lst->st_mode);
788 #else /* !S_ISLNK */
789 i = 0;
790 #endif /* S_ISLNK */
791 break;
793 case 'S':
794 # ifdef S_ISSOCK
795 i = S_ISSOCK(st->st_mode);
796 # else /* !S_ISSOCK */
797 i = 0;
798 # endif /* S_ISSOCK */
799 break;
801 case 'b':
802 #ifdef S_ISBLK
803 i = S_ISBLK(st->st_mode);
804 #else /* !S_ISBLK */
805 i = 0;
806 #endif /* S_ISBLK */
807 break;
809 case 'c':
810 #ifdef S_ISCHR
811 i = S_ISCHR(st->st_mode);
812 #else /* !S_ISCHR */
813 i = 0;
814 #endif /* S_ISCHR */
815 break;
817 case 'u':
818 i = (S_ISUID & st->st_mode) != 0;
819 break;
821 case 'g':
822 i = (S_ISGID & st->st_mode) != 0;
823 break;
825 case 'k':
826 i = (S_ISVTX & st->st_mode) != 0;
827 break;
829 case 'z':
830 i = st->st_size == 0;
831 break;
833 #ifdef convex
834 case 'R':
835 i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED;
836 break;
837 #endif /* convex */
839 case 's':
840 i = stb.st_size != 0;
841 break;
843 case 'e':
844 i = 1;
845 break;
847 case 'o':
848 i = st->st_uid == uid;
849 break;
852 * Value operators are a tcsh extension.
855 case 'D':
856 i = (tcsh_number_t) st->st_dev;
857 break;
859 case 'I':
860 i = (tcsh_number_t) st->st_ino;
861 break;
863 case 'F':
864 strdev = putn( (int) st->st_dev);
865 strino = putn( (int) st->st_ino);
866 strF = xmalloc((2 + Strlen(strdev) + Strlen(strino))
867 * sizeof(Char));
868 (void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino);
869 xfree(strdev);
870 xfree(strino);
871 cleanup_until(ep);
872 return(strF);
874 case 'L':
875 if ( *(ft + 1) ) {
876 i = 1;
877 break;
879 #ifdef S_ISLNK
880 filnam = short2str(ep);
881 string = areadlink(filnam);
882 strF = string == NULL ? errval : str2short(string);
883 xfree(string);
884 cleanup_until(ep);
885 return(Strsave(strF));
887 #else /* !S_ISLNK */
888 i = 0;
889 break;
890 #endif /* S_ISLNK */
893 case 'N':
894 i = (tcsh_number_t) st->st_nlink;
895 break;
897 case 'P':
898 string = string0 + 1;
899 (void) xsnprintf(string, sizeof(string0) - 1, "%o",
900 pmask & (unsigned int)
901 ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode));
902 if (altout && *string != '0')
903 *--string = '0';
904 cleanup_until(ep);
905 return(Strsave(str2short(string)));
907 case 'U':
908 if (altout && (pw = xgetpwuid(st->st_uid))) {
909 cleanup_until(ep);
910 return(Strsave(str2short(pw->pw_name)));
912 i = (tcsh_number_t) st->st_uid;
913 break;
915 case 'G':
916 if (altout && (gr = xgetgrgid(st->st_gid))) {
917 cleanup_until(ep);
918 return(Strsave(str2short(gr->gr_name)));
920 i = (tcsh_number_t) st->st_gid;
921 break;
923 case 'Z':
924 i = (tcsh_number_t) st->st_size;
925 break;
927 case 'A': case 'M': case 'C':
928 footime = *ft == 'A' ? st->st_atime :
929 *ft == 'M' ? st->st_mtime : st->st_ctime;
930 if (altout) {
931 strF = str2short(ctime(&footime));
932 if ((str = Strchr(strF, '\n')) != NULL)
933 *str = (Char) '\0';
934 cleanup_until(ep);
935 return(Strsave(strF));
937 i = (tcsh_number_t) footime;
938 break;
942 while (*++ft && i);
943 etraci("exp6 -? i", i, vp);
944 cleanup_until(ep);
945 return (putn(i));
949 static void
950 evalav(Char **v)
952 struct wordent paraml1;
953 struct wordent *hp = &paraml1;
954 struct command *t;
955 struct wordent *wdp = hp;
957 setcopy(STRstatus, STR0, VAR_READWRITE);
958 hp->prev = hp->next = hp;
959 hp->word = STRNULL;
960 while (*v) {
961 struct wordent *new = xcalloc(1, sizeof *wdp);
963 new->prev = wdp;
964 new->next = hp;
965 wdp->next = new;
966 wdp = new;
967 wdp->word = Strsave(*v++);
969 hp->prev = wdp;
970 cleanup_push(&paraml1, lex_cleanup);
971 alias(&paraml1);
972 t = syntax(paraml1.next, &paraml1, 0);
973 cleanup_push(t, syntax_cleanup);
974 if (seterr)
975 stderror(ERR_OLD);
976 execute(t, -1, NULL, NULL, TRUE);
977 cleanup_until(&paraml1);
980 static int
981 isa(Char *cp, int what)
983 if (cp == 0)
984 return ((what & RESTOP) != 0);
985 if (*cp == '\0')
986 return 0;
987 if (cp[1] == 0) {
988 if (what & ADDOP && (*cp == '+' || *cp == '-'))
989 return (1);
990 if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%'))
991 return (1);
992 if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' ||
993 *cp == '~' || *cp == '^' || *cp == '"'))
994 return (1);
996 else if (cp[2] == 0) {
997 if (what & RESTOP) {
998 if (cp[0] == '|' && cp[1] == '&')
999 return (1);
1000 if (cp[0] == '<' && cp[1] == '<')
1001 return (1);
1002 if (cp[0] == '>' && cp[1] == '>')
1003 return (1);
1005 if (what & EQOP) {
1006 if (cp[0] == '=') {
1007 if (cp[1] == '=')
1008 return (EQEQ);
1009 if (cp[1] == '~')
1010 return (EQMATCH);
1012 else if (cp[0] == '!') {
1013 if (cp[1] == '=')
1014 return (NOTEQ);
1015 if (cp[1] == '~')
1016 return (NOTEQMATCH);
1020 if (what & RELOP) {
1021 if (*cp == '<')
1022 return (LSS);
1023 if (*cp == '>')
1024 return (GTR);
1026 return (0);
1029 static tcsh_number_t
1030 egetn(const Char *cp)
1032 if (*cp && *cp != '-' && !Isdigit(*cp))
1033 stderror(ERR_NAME | ERR_EXPRESSION);
1034 return (getn(cp));
1037 /* Phew! */
1039 #ifdef EDEBUG
1040 static void
1041 etraci(const char *str, tcsh_number_t i, Char ***vp)
1043 #ifdef HAVE_LONG_LONG
1044 xprintf("%s=%lld\t", str, i);
1045 #else
1046 xprintf("%s=%ld\t", str, i);
1047 #endif
1048 blkpr(*vp);
1049 xputchar('\n');
1051 static void
1052 etracc(const char *str, const Char *cp, Char ***vp)
1054 xprintf("%s=%S\t", str, cp);
1055 blkpr(*vp);
1056 xputchar('\n');
1058 #endif /* EDEBUG */