PageRenderTime 79ms CodeModel.GetById 18ms app.highlight 53ms RepoModel.GetById 1ms app.codeStats 0ms

/contrib/tcsh/sh.exp.c

https://bitbucket.org/freebsd/freebsd-head/
C | 1057 lines | 840 code | 126 blank | 91 comment | 211 complexity | b6849cdfc95e90ffd701f2ae88e1214f MD5 | raw file
   1/* $Header: /p/tcsh/cvsroot/tcsh/sh.exp.c,v 3.58 2011/12/25 15:21:50 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.
   8 *
   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.
  20 *
  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.
  32 */
  33#include "sh.h"
  34
  35RCSID("$tcsh: sh.exp.c,v 3.58 2011/12/25 15:21:50 christos Exp $")
  36
  37#include "tw.h"
  38
  39/*
  40 * C shell
  41 */
  42
  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 */
  45
  46#define	ADDOP	1
  47#define	MULOP	2
  48#define	EQOP	4
  49#define	RELOP	8
  50#define	RESTOP	16
  51#define	ANYOP	31
  52
  53#define	EQEQ	1
  54#define	GTR	2
  55#define	LSS	4
  56#define	NOTEQ	6
  57#define EQMATCH 7
  58#define NOTEQMATCH 8
  59
  60static	int	   sh_access	(const Char *, int);
  61static	tcsh_number_t  exp1		(Char ***, int);
  62static	tcsh_number_t  exp2x	(Char ***, int);
  63static	tcsh_number_t  exp2a	(Char ***, int);
  64static	tcsh_number_t  exp2b	(Char ***, int);
  65static	tcsh_number_t  exp2c	(Char ***, int);
  66static	Char 	  *exp3		(Char ***, int);
  67static	Char 	  *exp3a	(Char ***, int);
  68static	Char 	  *exp4		(Char ***, int);
  69static	Char 	  *exp5		(Char ***, int);
  70static	Char 	  *exp6		(Char ***, int);
  71static	void	   evalav	(Char **);
  72static	int	   isa		(Char *, int);
  73static	tcsh_number_t  egetn	(const Char *);
  74
  75#ifdef EDEBUG
  76static	void	   etracc	(const char *, const Char *, Char ***);
  77static	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 */
  82
  83/*
  84 * shell access function according to POSIX and non POSIX
  85 * From Beto Appleton (beto@aixwiz.aix.ibm.com)
  86 */
  87static int
  88sh_access(const Char *fname, int mode)
  89{
  90#if defined(POSIX) && !defined(USE_ACCESS)
  91    struct stat     statb;
  92#endif /* POSIX */
  93    char *name = short2str(fname);
  94
  95    if (*name == '\0')
  96	return 1;
  97
  98#if !defined(POSIX) || defined(USE_ACCESS)
  99    return access(name, mode);
 100#else /* POSIX */
 101
 102    /*
 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.
 113     */
 114    if (mode != W_OK && mode != X_OK)
 115	return access(name, mode);
 116
 117    if (stat(name, &statb) == -1) 
 118	return 1;
 119
 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 */
 125
 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;
 137	}
 138
 139    } 
 140
 141    else if (euid == statb.st_uid)
 142	mode <<= 6;
 143
 144    else if (egid == statb.st_gid)
 145	mode <<= 3;
 146
 147# ifdef NGROUPS_MAX
 148    else {
 149	/* you can be in several groups */
 150	long	n;
 151	GETGROUPS_T *groups;
 152
 153	/*
 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.
 159	 */
 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);
 166
 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;
 174		}
 175	}
 176    }
 177# endif /* NGROUPS_MAX */
 178
 179    if (statb.st_mode & mode)
 180	return 0;
 181    else
 182	return 1;
 183#endif /* !POSIX */
 184}
 185
 186tcsh_number_t
 187expr(Char ***vp)
 188{
 189    return (exp0(vp, 0));
 190}
 191
 192tcsh_number_t
 193exp0(Char ***vp, int ignore)
 194{
 195    tcsh_number_t p1 = exp1(vp, ignore);
 196
 197    etraci("exp0 p1", p1, vp);
 198    while (**vp && eq(**vp, STRor2)) {
 199	int p2;
 200
 201	(*vp)++;
 202
 203	p2 = compat_expr ? 
 204	    exp0(vp, (ignore & TEXP_IGNORE) || p1) :
 205	    exp1(vp, (ignore & TEXP_IGNORE) || p1);
 206	if (compat_expr || !(ignore & TEXP_IGNORE))
 207	    p1 = (p1 || p2);
 208	etraci("exp0 p1", p1, vp);
 209	if (compat_expr)
 210	    break;
 211    }
 212    return (p1);
 213}
 214
 215static tcsh_number_t
 216exp1(Char ***vp, int ignore)
 217{
 218    tcsh_number_t p1 = exp2x(vp, ignore);
 219
 220    etraci("exp1 p1", p1, vp);
 221    while (**vp && eq(**vp, STRand2)) {
 222	tcsh_number_t p2;
 223
 224	(*vp)++;
 225	p2 = compat_expr ?
 226	    exp1(vp, (ignore & TEXP_IGNORE) || !p1) :
 227	    exp2x(vp, (ignore & TEXP_IGNORE) || !p1);
 228
 229	etraci("exp1 p2", p2, vp);
 230	if (compat_expr || !(ignore & TEXP_IGNORE))
 231	    p1 = (p1 && p2);
 232	etraci("exp1 p1", p1, vp);
 233	if (compat_expr)
 234	    break;
 235    }
 236    return (p1);
 237}
 238
 239static tcsh_number_t
 240exp2x(Char ***vp, int ignore)
 241{
 242    tcsh_number_t p1 = exp2a(vp, ignore);
 243
 244    etraci("exp2x p1", p1, vp);
 245    while (**vp && eq(**vp, STRor)) {
 246	tcsh_number_t p2;
 247
 248	(*vp)++;
 249	p2 = compat_expr ?
 250	    exp2x(vp, ignore) :
 251	    exp2a(vp, ignore);
 252	etraci("exp2x p2", p2, vp);
 253	if (compat_expr || !(ignore & TEXP_IGNORE))
 254		p1 = (p1 | p2);
 255	etraci("exp2x p1", p1, vp);
 256	if (compat_expr)
 257	    break;
 258    }
 259    return (p1);
 260}
 261
 262static tcsh_number_t
 263exp2a(Char ***vp, int ignore)
 264{
 265    tcsh_number_t p1 = exp2b(vp, ignore);
 266
 267    etraci("exp2a p1", p1, vp);
 268    while (**vp && eq(**vp, STRcaret)) {
 269	tcsh_number_t p2;
 270
 271	(*vp)++;
 272	p2 = compat_expr ?
 273	    exp2a(vp, ignore) :
 274	    exp2b(vp, ignore);
 275	etraci("exp2a p2", p2, vp);
 276	if (compat_expr || !(ignore & TEXP_IGNORE))
 277	    p1 = (p1 ^ p2);
 278	etraci("exp2a p1", p1, vp);
 279	if (compat_expr)
 280	    break;
 281    }
 282    return (p1);
 283}
 284
 285static tcsh_number_t
 286exp2b(Char ***vp, int ignore)
 287{
 288    tcsh_number_t p1 = exp2c(vp, ignore);
 289
 290    etraci("exp2b p1", p1, vp);
 291    while (**vp && eq(**vp, STRand)) {
 292	tcsh_number_t p2;
 293
 294	(*vp)++;
 295	p2 = compat_expr ?
 296	    exp2b(vp, ignore) :
 297	    exp2c(vp, ignore);
 298	etraci("exp2b p2", p2, vp);
 299	if (compat_expr || !(ignore & TEXP_IGNORE))
 300	    p1 = (p1 & p2);
 301	etraci("exp2b p1", p1, vp);
 302	if (compat_expr)
 303	    break;
 304    }
 305    return (p1);
 306}
 307
 308static tcsh_number_t
 309exp2c(Char ***vp, int ignore)
 310{
 311    Char *p1 = exp3(vp, ignore);
 312    Char *p2;
 313    tcsh_number_t i;
 314
 315    cleanup_push(p1, xfree);
 316    etracc("exp2c p1", p1, vp);
 317    if ((i = isa(**vp, EQOP)) != 0) {
 318	(*vp)++;
 319	if (i == EQMATCH || i == NOTEQMATCH)
 320	    ignore |= TEXP_NOGLOB;
 321	p2 = exp3(vp, ignore);
 322	cleanup_push(p2, xfree);
 323	etracc("exp2c p2", p2, vp);
 324	if (!(ignore & TEXP_IGNORE))
 325	    switch (i) {
 326
 327	    case EQEQ:
 328		i = eq(p1, p2);
 329		break;
 330
 331	    case NOTEQ:
 332		i = !eq(p1, p2);
 333		break;
 334
 335	    case EQMATCH:
 336		i = Gmatch(p1, p2);
 337		break;
 338
 339	    case NOTEQMATCH:
 340		i = !Gmatch(p1, p2);
 341		break;
 342	    }
 343	cleanup_until(p1);
 344	return (i);
 345    }
 346    i = egetn(p1);
 347    cleanup_until(p1);
 348    return (i);
 349}
 350
 351static Char *
 352exp3(Char ***vp, int ignore)
 353{
 354    Char *p1, *p2;
 355    tcsh_number_t i;
 356
 357    p1 = exp3a(vp, ignore);
 358    etracc("exp3 p1", p1, vp);
 359    while ((i = isa(**vp, RELOP)) != 0) {
 360	(*vp)++;
 361	if (**vp && eq(**vp, STRequal))
 362	    i |= 1, (*vp)++;
 363	cleanup_push(p1, xfree);
 364	p2 = compat_expr ?
 365	    exp3(vp, ignore) :
 366	    exp3a(vp, ignore);
 367	cleanup_push(p2, xfree);
 368	etracc("exp3 p2", p2, vp);
 369	if (!(ignore & TEXP_IGNORE))
 370	    switch (i) {
 371
 372	    case GTR:
 373		i = egetn(p1) > egetn(p2);
 374		break;
 375
 376	    case GTR | 1:
 377		i = egetn(p1) >= egetn(p2);
 378		break;
 379
 380	    case LSS:
 381		i = egetn(p1) < egetn(p2);
 382		break;
 383
 384	    case LSS | 1:
 385		i = egetn(p1) <= egetn(p2);
 386		break;
 387	    }
 388	cleanup_until(p1);
 389	p1 = putn(i);
 390	etracc("exp3 p1", p1, vp);
 391	if (compat_expr)
 392	    break;
 393    }
 394    return (p1);
 395}
 396
 397static Char *
 398exp3a(Char ***vp, int ignore)
 399{
 400    Char *p1, *p2;
 401    const Char *op;
 402    tcsh_number_t i;
 403
 404    p1 = exp4(vp, ignore);
 405    etracc("exp3a p1", p1, vp);
 406    op = **vp;
 407    if (op && any("<>", op[0]) && op[0] == op[1]) {
 408	(*vp)++;
 409	cleanup_push(p1, xfree);
 410	p2 = compat_expr ?
 411	    exp3a(vp, ignore) :
 412	    exp4(vp, ignore);
 413	cleanup_push(p2, xfree);
 414	etracc("exp3a p2", p2, vp);
 415	if (op[0] == '<')
 416	    i = egetn(p1) << egetn(p2);
 417	else
 418	    i = egetn(p1) >> egetn(p2);
 419	cleanup_until(p1);
 420	p1 = putn(i);
 421	etracc("exp3a p1", p1, vp);
 422    }
 423    return (p1);
 424}
 425
 426static Char *
 427exp4(Char ***vp, int ignore)
 428{
 429    Char *p1, *p2;
 430    tcsh_number_t i = 0;
 431
 432    p1 = exp5(vp, ignore);
 433    etracc("exp4 p1", p1, vp);
 434    while (isa(**vp, ADDOP)) {
 435	const Char *op = *(*vp)++;
 436
 437	cleanup_push(p1, xfree);
 438	p2 = compat_expr ?
 439	    exp4(vp, ignore) :
 440	    exp5(vp, ignore);
 441	cleanup_push(p2, xfree);
 442	etracc("exp4 p2", p2, vp);
 443	if (!(ignore & TEXP_IGNORE))
 444	    switch (op[0]) {
 445
 446	    case '+':
 447		i = egetn(p1) + egetn(p2);
 448		break;
 449
 450	    case '-':
 451		i = egetn(p1) - egetn(p2);
 452		break;
 453	    }
 454	cleanup_until(p1);
 455	p1 = putn(i);
 456	etracc("exp4 p1", p1, vp);
 457	if (compat_expr)
 458	    break;
 459    }
 460    return (p1);
 461}
 462
 463static Char *
 464exp5(Char ***vp, int ignore)
 465{
 466    Char *p1, *p2;
 467    tcsh_number_t i = 0;
 468
 469    p1 = exp6(vp, ignore);
 470    etracc("exp5 p1", p1, vp);
 471
 472    while (isa(**vp, MULOP)) {
 473	const Char *op = *(*vp)++;
 474	if ((ignore & TEXP_NOGLOB) != 0) {
 475	    /*
 476	     * We are just trying to get the right side of
 477	     * a =~ or !~ operator
 478	     */
 479	    xfree(p1);
 480	    return Strsave(op);
 481	}
 482
 483	cleanup_push(p1, xfree);
 484	p2 = compat_expr ? 
 485	    exp5(vp, ignore) :
 486	    exp6(vp, ignore);
 487	cleanup_push(p2, xfree);
 488	etracc("exp5 p2", p2, vp);
 489	if (!(ignore & TEXP_IGNORE))
 490	    switch (op[0]) {
 491
 492	    case '*':
 493		i = egetn(p1) * egetn(p2);
 494		break;
 495
 496	    case '/':
 497		i = egetn(p2);
 498		if (i == 0)
 499		    stderror(ERR_DIV0);
 500		i = egetn(p1) / i;
 501		break;
 502
 503	    case '%':
 504		i = egetn(p2);
 505		if (i == 0)
 506		    stderror(ERR_MOD0);
 507		i = egetn(p1) % i;
 508		break;
 509	    }
 510	cleanup_until(p1);
 511	p1 = putn(i);
 512	etracc("exp5 p1", p1, vp);
 513	if (compat_expr)
 514	    break;
 515    }
 516    return (p1);
 517}
 518
 519static Char *
 520exp6(Char ***vp, int ignore)
 521{
 522    tcsh_number_t ccode;
 523    tcsh_number_t i = 0;
 524    Char *cp;
 525
 526    if (**vp == 0)
 527	stderror(ERR_NAME | ERR_EXPRESSION);
 528    if (eq(**vp, STRbang)) {
 529	(*vp)++;
 530	cp = exp6(vp, ignore);
 531	cleanup_push(cp, xfree);
 532	etracc("exp6 ! cp", cp, vp);
 533	i = egetn(cp);
 534	cleanup_until(cp);
 535	return (putn(!i));
 536    }
 537    if (eq(**vp, STRtilde)) {
 538	(*vp)++;
 539	cp = exp6(vp, ignore);
 540	cleanup_push(cp, xfree);
 541	etracc("exp6 ~ cp", cp, vp);
 542	i = egetn(cp);
 543	cleanup_until(cp);
 544	return (putn(~i));
 545    }
 546    if (eq(**vp, STRLparen)) {
 547	(*vp)++;
 548	ccode = exp0(vp, ignore);
 549	etraci("exp6 () ccode", ccode, vp);
 550	if (**vp == 0 || ***vp != ')')
 551	    stderror(ERR_NAME | ERR_EXPRESSION);
 552	(*vp)++;
 553	return (putn(ccode));
 554    }
 555    if (eq(**vp, STRLbrace)) {
 556	Char **v;
 557	struct command faket;
 558	Char   *fakecom[2];
 559
 560	faket.t_dtyp = NODE_COMMAND;
 561	faket.t_dflg = F_BACKQ;
 562	faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
 563	faket.t_dcom = fakecom;
 564	fakecom[0] = STRfakecom;
 565	fakecom[1] = NULL;
 566	(*vp)++;
 567	v = *vp;
 568	for (;;) {
 569	    if (!**vp)
 570		stderror(ERR_NAME | ERR_MISSING, '}');
 571	    if (eq(*(*vp)++, STRRbrace))
 572		break;
 573	}
 574	if (ignore & TEXP_IGNORE)
 575	    return (Strsave(STRNULL));
 576	psavejob();
 577	cleanup_push(&faket, psavejob_cleanup); /* faket is only a marker */
 578	if (pfork(&faket, -1) == 0) {
 579	    *--(*vp) = 0;
 580	    evalav(v);
 581	    exitstat();
 582	}
 583	pwait();
 584	cleanup_until(&faket);
 585	etraci("exp6 {} status", egetn(varval(STRstatus)), vp);
 586	return (putn(egetn(varval(STRstatus)) == 0));
 587    }
 588    if (isa(**vp, ANYOP))
 589	return (Strsave(STRNULL));
 590    cp = *(*vp)++;
 591#ifdef convex
 592# define FILETESTS "erwxfdzoplstSXLbcugkmKR"
 593#else
 594# define FILETESTS "erwxfdzoplstSXLbcugkmK"
 595#endif /* convex */
 596#define FILEVALS  "ZAMCDIUGNFPL"
 597    if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1])))
 598        return(filetest(cp, vp, ignore));
 599    etracc("exp6 default", cp, vp);
 600    return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND));
 601}
 602
 603
 604/* 
 605 * Extended file tests
 606 * From: John Rowe <rowe@excc.exeter.ac.uk>
 607 */
 608Char *
 609filetest(Char *cp, Char ***vp, int ignore)
 610{
 611#ifdef convex
 612    struct cvxstat stb, *st = NULL;
 613# define TCSH_STAT	stat64
 614#else
 615# define TCSH_STAT	stat
 616    struct stat stb, *st = NULL;
 617#endif /* convex */
 618
 619#ifdef S_IFLNK
 620# ifdef convex
 621    struct cvxstat lstb, *lst = NULL;
 622#  define TCSH_LSTAT lstat64
 623# else
 624#  define TCSH_LSTAT lstat
 625    struct stat lstb, *lst = NULL;
 626# endif /* convex */
 627    char *filnam;
 628#endif /* S_IFLNK */
 629
 630    tcsh_number_t i = 0;
 631    unsigned pmask = 0xffff;
 632    int altout = 0;
 633    Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0',
 634    *errval = STR0;
 635    char *string, string0[22 + MB_LEN_MAX + 1];	// space for 64 bit octal
 636    time_t footime;
 637    struct passwd *pw;
 638    struct group *gr;
 639
 640    while(any(FILETESTS, *++ft))
 641	continue;
 642
 643    if (!*ft && *(ft - 1) == 'L')
 644	--ft;
 645
 646    if (any(FILEVALS, *ft)) {
 647	valtest = *ft++;
 648	/*
 649	 * Value tests return '-1' on failure as 0 is
 650	 * a legitimate value for many of them.
 651	 * 'F' returns ':' for compatibility.
 652	 */
 653	errval = valtest == 'F' ? STRcolon : STRminus1;
 654
 655	if (valtest == 'P' && *ft >= '0' && *ft <= '7') {
 656	    pmask = (char) *ft - '0';
 657	    while ( *++ft >= '0' && *ft <= '7' )
 658		pmask = 8 * pmask + ((char) *ft - '0');
 659	}
 660	if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) {
 661	    altout = 1;
 662	    ++ft;
 663	}
 664    }
 665
 666    if (*ft || ft == cp + 1)
 667	stderror(ERR_NAME | ERR_FILEINQ);
 668
 669    /*
 670     * Detect missing file names by checking for operator in the file name
 671     * position.  However, if an operator name appears there, we must make
 672     * sure that there's no file by that name (e.g., "/") before announcing
 673     * an error.  Even this check isn't quite right, since it doesn't take
 674     * globbing into account.
 675     */
 676
 677    if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb))
 678	stderror(ERR_NAME | ERR_FILENAME);
 679
 680    dp = *(*vp)++;
 681    if (ignore & TEXP_IGNORE)
 682	return (Strsave(STRNULL));
 683    ep = globone(dp, G_APPEND);
 684    cleanup_push(ep, xfree);
 685    ft = &cp[1];
 686    do 
 687	switch (*ft) {
 688
 689	case 'r':
 690	    i = !sh_access(ep, R_OK);
 691	    break;
 692
 693	case 'w':
 694	    i = !sh_access(ep, W_OK);
 695	    break;
 696
 697	case 'x':
 698	    i = !sh_access(ep, X_OK);
 699	    break;
 700
 701	case 'X':	/* tcsh extension, name is an executable in the path
 702			 * or a tcsh builtin command 
 703			 */
 704	    i = find_cmd(ep, 0);
 705	    break;
 706
 707	case 't':	/* SGI extension, true when file is a tty */
 708	    i = isatty(atoi(short2str(ep)));
 709	    break;
 710
 711	default:
 712
 713#ifdef S_IFLNK
 714	    if (tolower(*ft) == 'l') {
 715		/* 
 716		 * avoid convex compiler bug.
 717		 */
 718		if (!lst) {
 719		    lst = &lstb;
 720		    if (TCSH_LSTAT(short2str(ep), lst) == -1) {
 721			cleanup_until(ep);
 722			return (Strsave(errval));
 723		    }
 724		}
 725		if (*ft == 'L')
 726		    st = lst;
 727	    }
 728	    else 
 729#endif /* S_IFLNK */
 730		/* 
 731		 * avoid convex compiler bug.
 732		 */
 733		if (!st) {
 734		    st = &stb;
 735		    if (TCSH_STAT(short2str(ep), st) == -1) {
 736			cleanup_until(ep);
 737			return (Strsave(errval));
 738		    }
 739		}
 740
 741	    switch (*ft) {
 742
 743	    case 'f':
 744#ifdef S_ISREG
 745		i = S_ISREG(st->st_mode);
 746#else /* !S_ISREG */
 747		i = 0;
 748#endif /* S_ISREG */
 749		break;
 750
 751	    case 'd':
 752#ifdef S_ISDIR
 753		i = S_ISDIR(st->st_mode);
 754#else /* !S_ISDIR */
 755		i = 0;
 756#endif /* S_ISDIR */
 757		break;
 758
 759	    case 'p':
 760#ifdef S_ISFIFO
 761		i = S_ISFIFO(st->st_mode);
 762#else /* !S_ISFIFO */
 763		i = 0;
 764#endif /* S_ISFIFO */
 765		break;
 766
 767	    case 'm' :
 768#ifdef S_ISOFL
 769	      i = S_ISOFL(st->st_dm_mode);
 770#else /* !S_ISOFL */
 771	      i = 0;
 772#endif /* S_ISOFL */
 773	      break ;
 774
 775	    case 'K' :
 776#ifdef S_ISOFL
 777	      i = stb.st_dm_key;
 778#else /* !S_ISOFL */
 779	      i = 0;
 780#endif /* S_ISOFL */
 781	      break ;
 782  
 783
 784	    case 'l':
 785#ifdef S_ISLNK
 786		i = S_ISLNK(lst->st_mode);
 787#else /* !S_ISLNK */
 788		i = 0;
 789#endif /* S_ISLNK */
 790		break;
 791
 792	    case 'S':
 793# ifdef S_ISSOCK
 794		i = S_ISSOCK(st->st_mode);
 795# else /* !S_ISSOCK */
 796		i = 0;
 797# endif /* S_ISSOCK */
 798		break;
 799
 800	    case 'b':
 801#ifdef S_ISBLK
 802		i = S_ISBLK(st->st_mode);
 803#else /* !S_ISBLK */
 804		i = 0;
 805#endif /* S_ISBLK */
 806		break;
 807
 808	    case 'c':
 809#ifdef S_ISCHR
 810		i = S_ISCHR(st->st_mode);
 811#else /* !S_ISCHR */
 812		i = 0;
 813#endif /* S_ISCHR */
 814		break;
 815
 816	    case 'u':
 817		i = (S_ISUID & st->st_mode) != 0;
 818		break;
 819
 820	    case 'g':
 821		i = (S_ISGID & st->st_mode) != 0;
 822		break;
 823
 824	    case 'k':
 825		i = (S_ISVTX & st->st_mode) != 0;
 826		break;
 827
 828	    case 'z':
 829		i = st->st_size == 0;
 830		break;
 831
 832#ifdef convex
 833	    case 'R':
 834		i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED;
 835		break;
 836#endif /* convex */
 837
 838	    case 's':
 839		i = stb.st_size != 0;
 840		break;
 841
 842	    case 'e':
 843		i = 1;
 844		break;
 845
 846	    case 'o':
 847		i = st->st_uid == uid;
 848		break;
 849
 850		/*
 851		 * Value operators are a tcsh extension.
 852		 */
 853
 854	    case 'D':
 855		i = (tcsh_number_t) st->st_dev;
 856		break;
 857
 858	    case 'I':
 859		i = (tcsh_number_t) st->st_ino;
 860		break;
 861		
 862	    case 'F':
 863		strdev = putn( (int) st->st_dev);
 864		strino = putn( (int) st->st_ino);
 865		strF = xmalloc((2 + Strlen(strdev) + Strlen(strino))
 866			       * sizeof(Char));
 867		(void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino);
 868		xfree(strdev);
 869		xfree(strino);
 870		cleanup_until(ep);
 871		return(strF);
 872		
 873	    case 'L':
 874		if ( *(ft + 1) ) {
 875		    i = 1;
 876		    break;
 877		}
 878#ifdef S_ISLNK
 879		filnam = short2str(ep);
 880		string = areadlink(filnam);
 881		strF = string == NULL ? errval : str2short(string);
 882		xfree(string);
 883		cleanup_until(ep);
 884		return(Strsave(strF));
 885
 886#else /* !S_ISLNK */
 887		i = 0;
 888		break;
 889#endif /* S_ISLNK */
 890		
 891
 892	    case 'N':
 893		i = (tcsh_number_t) st->st_nlink;
 894		break;
 895
 896	    case 'P':
 897		string = string0 + 1;
 898		(void) xsnprintf(string, sizeof(string0) - 1, "%o",
 899		    pmask & (unsigned int) 
 900		    ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode));
 901		if (altout && *string != '0')
 902		    *--string = '0';
 903		cleanup_until(ep);
 904		return(Strsave(str2short(string)));
 905
 906	    case 'U':
 907		if (altout && (pw = xgetpwuid(st->st_uid))) {
 908		    cleanup_until(ep);
 909		    return(Strsave(str2short(pw->pw_name)));
 910		}
 911		i = (tcsh_number_t) st->st_uid;
 912		break;
 913
 914	    case 'G':
 915		if (altout && (gr = xgetgrgid(st->st_gid))) {
 916		    cleanup_until(ep);
 917		    return(Strsave(str2short(gr->gr_name)));
 918		}
 919		i = (tcsh_number_t) st->st_gid;
 920		break;
 921
 922	    case 'Z':
 923		i = (tcsh_number_t) st->st_size;
 924		break;
 925
 926	    case 'A': case 'M': case 'C':
 927		footime = *ft == 'A' ? st->st_atime :
 928		    *ft == 'M' ? st->st_mtime : st->st_ctime;
 929		if (altout) {
 930		    strF = str2short(ctime(&footime));
 931		    if ((str = Strchr(strF, '\n')) != NULL)
 932			*str = (Char) '\0';
 933		    cleanup_until(ep);
 934		    return(Strsave(strF));
 935		}
 936		i = (tcsh_number_t) footime;
 937		break;
 938
 939	    }
 940	}
 941    while (*++ft && i);
 942    etraci("exp6 -? i", i, vp);
 943    cleanup_until(ep);
 944    return (putn(i));
 945}
 946
 947
 948static void
 949evalav(Char **v)
 950{
 951    struct wordent paraml1;
 952    struct wordent *hp = &paraml1;
 953    struct command *t;
 954    struct wordent *wdp = hp;
 955
 956    setcopy(STRstatus, STR0, VAR_READWRITE);
 957    hp->prev = hp->next = hp;
 958    hp->word = STRNULL;
 959    while (*v) {
 960	struct wordent *new = xcalloc(1, sizeof *wdp);
 961
 962	new->prev = wdp;
 963	new->next = hp;
 964	wdp->next = new;
 965	wdp = new;
 966	wdp->word = Strsave(*v++);
 967    }
 968    hp->prev = wdp;
 969    cleanup_push(&paraml1, lex_cleanup);
 970    alias(&paraml1);
 971    t = syntax(paraml1.next, &paraml1, 0);
 972    cleanup_push(t, syntax_cleanup);
 973    if (seterr)
 974	stderror(ERR_OLD);
 975    execute(t, -1, NULL, NULL, TRUE);
 976    cleanup_until(&paraml1);
 977}
 978
 979static int
 980isa(Char *cp, int what)
 981{
 982    if (cp == 0)
 983	return ((what & RESTOP) != 0);
 984    if (*cp == '\0')
 985    	return 0;
 986    if (cp[1] == 0) {
 987	if (what & ADDOP && (*cp == '+' || *cp == '-'))
 988	    return (1);
 989	if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%'))
 990	    return (1);
 991	if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' ||
 992			      *cp == '~' || *cp == '^' || *cp == '"'))
 993	    return (1);
 994    }
 995    else if (cp[2] == 0) {
 996	if (what & RESTOP) {
 997	    if (cp[0] == '|' && cp[1] == '&')
 998		return (1);
 999	    if (cp[0] == '<' && cp[1] == '<')
1000		return (1);
1001	    if (cp[0] == '>' && cp[1] == '>')
1002		return (1);
1003	}
1004	if (what & EQOP) {
1005	    if (cp[0] == '=') {
1006		if (cp[1] == '=')
1007		    return (EQEQ);
1008		if (cp[1] == '~')
1009		    return (EQMATCH);
1010	    }
1011	    else if (cp[0] == '!') {
1012		if (cp[1] == '=')
1013		    return (NOTEQ);
1014		if (cp[1] == '~')
1015		    return (NOTEQMATCH);
1016	    }
1017	}
1018    }
1019    if (what & RELOP) {
1020	if (*cp == '<')
1021	    return (LSS);
1022	if (*cp == '>')
1023	    return (GTR);
1024    }
1025    return (0);
1026}
1027
1028static tcsh_number_t
1029egetn(const Char *cp)
1030{
1031    if (*cp && *cp != '-' && !Isdigit(*cp))
1032	stderror(ERR_NAME | ERR_EXPRESSION);
1033    return (getn(cp));
1034}
1035
1036/* Phew! */
1037
1038#ifdef EDEBUG
1039static void
1040etraci(const char *str, tcsh_number_t i, Char ***vp)
1041{
1042#ifdef HAVE_LONG_LONG
1043    xprintf("%s=%lld\t", str, i);
1044#else
1045    xprintf("%s=%ld\t", str, i);
1046#endif
1047    blkpr(*vp);
1048    xputchar('\n');
1049}
1050static void
1051etracc(const char *str, const Char *cp, Char ***vp)
1052{
1053    xprintf("%s=%S\t", str, cp);
1054    blkpr(*vp);
1055    xputchar('\n');
1056}
1057#endif /* EDEBUG */