Import the latest version of the 44BSD C-shell -- tcsh-6.09.

1 files changed, 1107 insertions, 0 deletions

diff --git a/contrib/tcsh/sh.exp.c b/contrib/tcsh/sh.exp.c
new file mode 100644
index 0000000..6a26775
--- /dev/null
+++ b/contrib/tcsh/sh.exp.c
@@ -0,0 +1,1107 @@
+/* $Header: /src/pub/tcsh/sh.exp.c,v 3.38 1998/11/24 18:17:32 christos Exp $ */
+/*
+ * sh.exp.c: Expression evaluations
+ */
+/*-
+ * Copyright (c) 1980, 1991 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include "sh.h"
+
+RCSID("$Id: sh.exp.c,v 3.38 1998/11/24 18:17:32 christos Exp $")
+
+/*
+ * C shell
+ */
+
+#define TEXP_IGNORE 1	/* in ignore, it means to ignore value, just parse */
+#define TEXP_NOGLOB 2	/* in ignore, it means not to globone */
+
+#define	ADDOP	1
+#define	MULOP	2
+#define	EQOP	4
+#define	RELOP	8
+#define	RESTOP	16
+#define	ANYOP	31
+
+#define	EQEQ	1
+#define	GTR	2
+#define	LSS	4
+#define	NOTEQ	6
+#define EQMATCH 7
+#define NOTEQMATCH 8
+
+static	int	 sh_access	__P((Char *, int));
+static	int	 exp1		__P((Char ***, bool));
+static	int	 exp2		__P((Char ***, bool));
+static	int	 exp2a		__P((Char ***, bool));
+static	int	 exp2b		__P((Char ***, bool));
+static	int	 exp2c		__P((Char ***, bool));
+static	Char 	*exp3		__P((Char ***, bool));
+static	Char 	*exp3a		__P((Char ***, bool));
+static	Char 	*exp4		__P((Char ***, bool));
+static	Char 	*exp5		__P((Char ***, bool));
+static	Char 	*exp6		__P((Char ***, bool));
+static	void	 evalav		__P((Char **));
+static	int	 isa		__P((Char *, int));
+static	int	 egetn		__P((Char *));
+
+
+#ifdef EDEBUG
+static	void	 etracc		__P((char *, Char *, Char ***));
+static	void	 etraci		__P((char *, int, Char ***));
+#endif /* EDEBUG */
+
+
+/*
+ * shell access function according to POSIX and non POSIX
+ * From Beto Appleton (beto@aixwiz.aix.ibm.com)
+ */
+static int
+sh_access(fname, mode)
+    Char *fname;
+    int mode;
+{
+#if defined(POSIX) && !defined(USE_ACCESS)
+    struct stat     statb;
+#endif /* POSIX */
+    char *name = short2str(fname);
+
+    if (*name == '\0')
+	return 1;
+
+#if !defined(POSIX) || defined(USE_ACCESS)
+    return access(name, mode);
+#else /* POSIX */
+
+    /*
+     * POSIX 1003.2-d11.2 
+     *	-r file		True if file exists and is readable. 
+     *	-w file		True if file exists and is writable. 
+     *			True shall indicate only that the write flag is on. 
+     *			The file shall not be writable on a read-only file
+     *			system even if this test indicates true.
+     *	-x file		True if file exists and is executable. 
+     *			True shall indicate only that the execute flag is on. 
+     *			If file is a directory, true indicates that the file 
+     *			can be searched.
+     */
+    if (mode != W_OK && mode != X_OK)
+	return access(name, mode);
+
+    if (stat(name, &statb) == -1) 
+	return 1;
+
+    if (access(name, mode) == 0) {
+#ifdef S_ISDIR
+	if (S_ISDIR(statb.st_mode) && mode == X_OK)
+	    return 0;
+#endif /* S_ISDIR */
+
+	/* root needs permission for someone */
+	switch (mode) {
+	case W_OK:
+	    mode = S_IWUSR | S_IWGRP | S_IWOTH;
+	    break;
+	case X_OK:
+	    mode = S_IXUSR | S_IXGRP | S_IXOTH;
+	    break;
+	default:
+	    abort();
+	    break;
+	}
+
+    } 
+
+    else if (euid == statb.st_uid)
+	mode <<= 6;
+
+    else if (egid == statb.st_gid)
+	mode <<= 3;
+
+# ifdef NGROUPS_MAX
+    else {
+#  if defined(__386BSD__) || defined(BSD4_4)
+    /*
+     * These two decided that setgroup() should take an array of int's
+     * and they define _SC_NGROUPS_MAX without having sysconf
+     */
+#   undef _SC_NGROUPS_MAX	
+#   if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__bsdi__)
+#    define GID_T gid_t
+#   else
+#    define GID_T int
+#   endif
+#  else
+#   define GID_T gid_t
+#  endif /* __386BSD__ || BSD4_4 */
+	/* you can be in several groups */
+	long	n;
+	GID_T	*groups;
+
+	/*
+	 * Try these things to find a positive maximum groups value:
+	 *   1) sysconf(_SC_NGROUPS_MAX)
+	 *   2) NGROUPS_MAX
+	 *   3) getgroups(0, unused)
+	 * Then allocate and scan the groups array if one of these worked.
+	 */
+#  ifdef _SC_NGROUPS_MAX
+	if ((n = sysconf(_SC_NGROUPS_MAX)) == -1)
+#  endif /* _SC_NGROUPS_MAX */
+	    n = NGROUPS_MAX;
+	if (n <= 0)
+	    n = getgroups(0, (GID_T *) NULL);
+
+	if (n > 0) {
+	    groups = (GID_T *) xmalloc((size_t) (n * sizeof(GID_T)));
+	    n = getgroups((int) n, groups);
+	    while (--n >= 0)
+		if (groups[n] == statb.st_gid) {
+		    mode <<= 3;
+		    break;
+		}
+	}
+    }
+# endif /* NGROUPS_MAX */
+
+    if (statb.st_mode & mode)
+	return 0;
+    else
+	return 1;
+#endif /* !POSIX */
+}
+
+int
+expr(vp)
+    register Char ***vp;
+{
+    return (exp0(vp, 0));
+}
+
+int
+exp0(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register int p1 = exp1(vp, ignore);
+
+#ifdef EDEBUG
+    etraci("exp0 p1", p1, vp);
+#endif /* EDEBUG */
+    if (**vp && eq(**vp, STRor2)) {
+	register int p2;
+
+	(*vp)++;
+	p2 = exp0(vp, (ignore & TEXP_IGNORE) || p1);
+#ifdef EDEBUG
+	etraci("exp0 p2", p2, vp);
+#endif /* EDEBUG */
+	return (p1 || p2);
+    }
+    return (p1);
+}
+
+static int
+exp1(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register int p1 = exp2(vp, ignore);
+
+#ifdef EDEBUG
+    etraci("exp1 p1", p1, vp);
+#endif /* EDEBUG */
+    if (**vp && eq(**vp, STRand2)) {
+	register int p2;
+
+	(*vp)++;
+	p2 = exp1(vp, (ignore & TEXP_IGNORE) || !p1);
+#ifdef EDEBUG
+	etraci("exp1 p2", p2, vp);
+#endif /* EDEBUG */
+	return (p1 && p2);
+    }
+    return (p1);
+}
+
+static int
+exp2(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register int p1 = exp2a(vp, ignore);
+
+#ifdef EDEBUG
+    etraci("exp3 p1", p1, vp);
+#endif /* EDEBUG */
+    if (**vp && eq(**vp, STRor)) {
+	register int p2;
+
+	(*vp)++;
+	p2 = exp2(vp, ignore);
+#ifdef EDEBUG
+	etraci("exp3 p2", p2, vp);
+#endif /* EDEBUG */
+	return (p1 | p2);
+    }
+    return (p1);
+}
+
+static int
+exp2a(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register int p1 = exp2b(vp, ignore);
+
+#ifdef EDEBUG
+    etraci("exp2a p1", p1, vp);
+#endif /* EDEBUG */
+    if (**vp && eq(**vp, STRcaret)) {
+	register int p2;
+
+	(*vp)++;
+	p2 = exp2a(vp, ignore);
+#ifdef EDEBUG
+	etraci("exp2a p2", p2, vp);
+#endif /* EDEBUG */
+	return (p1 ^ p2);
+    }
+    return (p1);
+}
+
+static int
+exp2b(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register int p1 = exp2c(vp, ignore);
+
+#ifdef EDEBUG
+    etraci("exp2b p1", p1, vp);
+#endif /* EDEBUG */
+    if (**vp && eq(**vp, STRand)) {
+	register int p2;
+
+	(*vp)++;
+	p2 = exp2b(vp, ignore);
+#ifdef EDEBUG
+	etraci("exp2b p2", p2, vp);
+#endif /* EDEBUG */
+	return (p1 & p2);
+    }
+    return (p1);
+}
+
+static int
+exp2c(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register Char *p1 = exp3(vp, ignore);
+    register Char *p2;
+    register int i;
+
+#ifdef EDEBUG
+    etracc("exp2c p1", p1, vp);
+#endif /* EDEBUG */
+    if ((i = isa(**vp, EQOP)) != 0) {
+	(*vp)++;
+	if (i == EQMATCH || i == NOTEQMATCH)
+	    ignore |= TEXP_NOGLOB;
+	p2 = exp3(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp2c p2", p2, vp);
+#endif /* EDEBUG */
+	if (!(ignore & TEXP_IGNORE))
+	    switch (i) {
+
+	    case EQEQ:
+		i = eq(p1, p2);
+		break;
+
+	    case NOTEQ:
+		i = !eq(p1, p2);
+		break;
+
+	    case EQMATCH:
+		i = Gmatch(p1, p2);
+		break;
+
+	    case NOTEQMATCH:
+		i = !Gmatch(p1, p2);
+		break;
+	    }
+	xfree((ptr_t) p1);
+	xfree((ptr_t) p2);
+	return (i);
+    }
+    i = egetn(p1);
+    xfree((ptr_t) p1);
+    return (i);
+}
+
+static Char *
+exp3(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register Char *p1, *p2;
+    register int i;
+
+    p1 = exp3a(vp, ignore);
+#ifdef EDEBUG
+    etracc("exp3 p1", p1, vp);
+#endif /* EDEBUG */
+    if ((i = isa(**vp, RELOP)) != 0) {
+	(*vp)++;
+	if (**vp && eq(**vp, STRequal))
+	    i |= 1, (*vp)++;
+	p2 = exp3(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp3 p2", p2, vp);
+#endif /* EDEBUG */
+	if (!(ignore & TEXP_IGNORE))
+	    switch (i) {
+
+	    case GTR:
+		i = egetn(p1) > egetn(p2);
+		break;
+
+	    case GTR | 1:
+		i = egetn(p1) >= egetn(p2);
+		break;
+
+	    case LSS:
+		i = egetn(p1) < egetn(p2);
+		break;
+
+	    case LSS | 1:
+		i = egetn(p1) <= egetn(p2);
+		break;
+	    }
+	xfree((ptr_t) p1);
+	xfree((ptr_t) p2);
+	return (putn(i));
+    }
+    return (p1);
+}
+
+static Char *
+exp3a(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register Char *p1, *p2, *op;
+    register int i;
+
+    p1 = exp4(vp, ignore);
+#ifdef EDEBUG
+    etracc("exp3a p1", p1, vp);
+#endif /* EDEBUG */
+    op = **vp;
+    if (op && any("<>", op[0]) && op[0] == op[1]) {
+	(*vp)++;
+	p2 = exp3a(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp3a p2", p2, vp);
+#endif /* EDEBUG */
+	if (op[0] == '<')
+	    i = egetn(p1) << egetn(p2);
+	else
+	    i = egetn(p1) >> egetn(p2);
+	xfree((ptr_t) p1);
+	xfree((ptr_t) p2);
+	return (putn(i));
+    }
+    return (p1);
+}
+
+static Char *
+exp4(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register Char *p1, *p2;
+    register int i = 0;
+
+    p1 = exp5(vp, ignore);
+#ifdef EDEBUG
+    etracc("exp4 p1", p1, vp);
+#endif /* EDEBUG */
+    if (isa(**vp, ADDOP)) {
+	register Char *op = *(*vp)++;
+
+	p2 = exp4(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp4 p2", p2, vp);
+#endif /* EDEBUG */
+	if (!(ignore & TEXP_IGNORE))
+	    switch (op[0]) {
+
+	    case '+':
+		i = egetn(p1) + egetn(p2);
+		break;
+
+	    case '-':
+		i = egetn(p1) - egetn(p2);
+		break;
+	    }
+	xfree((ptr_t) p1);
+	xfree((ptr_t) p2);
+	return (putn(i));
+    }
+    return (p1);
+}
+
+static Char *
+exp5(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    register Char *p1, *p2;
+    register int i = 0;
+
+    p1 = exp6(vp, ignore);
+#ifdef EDEBUG
+    etracc("exp5 p1", p1, vp);
+#endif /* EDEBUG */
+
+    if (isa(**vp, MULOP)) {
+	register Char *op = *(*vp)++;
+	if ((ignore & TEXP_NOGLOB) != 0) 
+	    /* 
+	     * We are just trying to get the right side of
+	     * a =~ or !~ operator 
+	     */
+	    return Strsave(op);
+
+	p2 = exp5(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp5 p2", p2, vp);
+#endif /* EDEBUG */
+	if (!(ignore & TEXP_IGNORE))
+	    switch (op[0]) {
+
+	    case '*':
+		i = egetn(p1) * egetn(p2);
+		break;
+
+	    case '/':
+		i = egetn(p2);
+		if (i == 0)
+		    stderror(ERR_DIV0);
+		i = egetn(p1) / i;
+		break;
+
+	    case '%':
+		i = egetn(p2);
+		if (i == 0)
+		    stderror(ERR_MOD0);
+		i = egetn(p1) % i;
+		break;
+	    }
+	xfree((ptr_t) p1);
+	xfree((ptr_t) p2);
+	return (putn(i));
+    }
+    return (p1);
+}
+
+static Char *
+exp6(vp, ignore)
+    register Char ***vp;
+    bool    ignore;
+{
+    int     ccode, i = 0;
+    register Char *cp;
+
+    if (**vp == 0)
+	stderror(ERR_NAME | ERR_EXPRESSION);
+    if (eq(**vp, STRbang)) {
+	(*vp)++;
+	cp = exp6(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp6 ! cp", cp, vp);
+#endif /* EDEBUG */
+	i = egetn(cp);
+	xfree((ptr_t) cp);
+	return (putn(!i));
+    }
+    if (eq(**vp, STRtilde)) {
+	(*vp)++;
+	cp = exp6(vp, ignore);
+#ifdef EDEBUG
+	etracc("exp6 ~ cp", cp, vp);
+#endif /* EDEBUG */
+	i = egetn(cp);
+	xfree((ptr_t) cp);
+	return (putn(~i));
+    }
+    if (eq(**vp, STRLparen)) {
+	(*vp)++;
+	ccode = exp0(vp, ignore);
+#ifdef EDEBUG
+	etraci("exp6 () ccode", ccode, vp);
+#endif /* EDEBUG */
+	if (*vp == 0 || **vp == 0 || ***vp != ')')
+	    stderror(ERR_NAME | ERR_EXPRESSION);
+	(*vp)++;
+	return (putn(ccode));
+    }
+    if (eq(**vp, STRLbrace)) {
+	register Char **v;
+	struct command faket;
+	Char   *fakecom[2];
+
+	faket.t_dtyp = NODE_COMMAND;
+	faket.t_dflg = F_BACKQ;
+	faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
+	faket.t_dcom = fakecom;
+	fakecom[0] = STRfakecom;
+	fakecom[1] = NULL;
+	(*vp)++;
+	v = *vp;
+	for (;;) {
+	    if (!**vp)
+		stderror(ERR_NAME | ERR_MISSING, '}');
+	    if (eq(*(*vp)++, STRRbrace))
+		break;
+	}
+	if (ignore & TEXP_IGNORE)
+	    return (Strsave(STRNULL));
+	psavejob();
+	if (pfork(&faket, -1) == 0) {
+	    *--(*vp) = 0;
+	    evalav(v);
+	    exitstat();
+	}
+	pwait();
+	prestjob();
+#ifdef EDEBUG
+	etraci("exp6 {} status", egetn(varval(STRstatus)), vp);
+#endif /* EDEBUG */
+	return (putn(egetn(varval(STRstatus)) == 0));
+    }
+    if (isa(**vp, ANYOP))
+	return (Strsave(STRNULL));
+    cp = *(*vp)++;
+#ifdef convex
+# define FILETESTS "erwxfdzoplstSXLbcugkmKR"
+#else
+# define FILETESTS "erwxfdzoplstSXLbcugkmK"
+#endif /* convex */
+#define FILEVALS  "ZAMCDIUGNFPL"
+    if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1])))
+        return(filetest(cp, vp, ignore));
+#ifdef EDEBUG
+    etracc("exp6 default", cp, vp);
+#endif /* EDEBUG */
+    return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND));
+}
+
+
+/* 
+ * Extended file tests
+ * From: John Rowe <rowe@excc.exeter.ac.uk>
+ */
+Char *
+filetest(cp, vp, ignore)
+    Char *cp, ***vp;
+    bool ignore;
+{
+#ifdef convex
+    struct cvxstat stb, *st = NULL;
+# define TCSH_STAT	stat64
+#else
+# define TCSH_STAT	stat
+    struct stat stb, *st = NULL;
+#endif /* convex */
+
+#ifdef S_IFLNK
+# ifdef convex
+    struct cvxstat lstb, *lst = NULL;
+#  define TCSH_LSTAT lstat64
+# else
+#  define TCSH_LSTAT lstat
+    struct stat lstb, *lst = NULL;
+# endif /* convex */
+    char *filnam;
+#endif /* S_IFLNK */
+
+    int i = 0;
+    unsigned pmask = 0xffff;
+    bool altout = 0;
+    Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0',
+    *errval = STR0;
+    char *string, string0[8];
+    time_t footime;
+    struct passwd *pw;
+    struct group *gr;
+
+    while(any(FILETESTS, *++ft))
+	continue;
+
+    if (!*ft && *(ft - 1) == 'L')
+	--ft;
+
+    if (any(FILEVALS, *ft)) {
+	valtest = *ft++;
+	/*
+	 * Value tests return '-1' on failure as 0 is
+	 * a legitimate value for many of them.
+	 * 'F' returns ':' for compatibility.
+	 */
+	errval = valtest == 'F' ? STRcolon : STRminus1;
+
+	if (valtest == 'P' && *ft >= '0' && *ft <= '7') {
+	    pmask = (char) *ft - '0';
+	    while ( *++ft >= '0' && *ft <= '7' )
+		pmask = 8 * pmask + ((char) *ft - '0');
+	}
+	if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) {
+	    altout = 1;
+	    ++ft;
+	}
+    }
+
+    if (*ft || ft == cp + 1)
+	stderror(ERR_NAME | ERR_FILEINQ);
+
+    /*
+     * Detect missing file names by checking for operator in the file name
+     * position.  However, if an operator name appears there, we must make
+     * sure that there's no file by that name (e.g., "/") before announcing
+     * an error.  Even this check isn't quite right, since it doesn't take
+     * globbing into account.
+     */
+
+    if (isa(**vp, ANYOP) && TCSH_STAT(short2str(**vp), &stb))
+	stderror(ERR_NAME | ERR_FILENAME);
+
+    dp = *(*vp)++;
+    if (ignore & TEXP_IGNORE)
+	return (Strsave(STRNULL));
+    ep = globone(dp, G_APPEND);
+    ft = &cp[1];
+    do 
+	switch (*ft) {
+
+	case 'r':
+	    i = !sh_access(ep, R_OK);
+	    break;
+
+	case 'w':
+	    i = !sh_access(ep, W_OK);
+	    break;
+
+	case 'x':
+	    i = !sh_access(ep, X_OK);
+	    break;
+
+	case 'X':	/* tcsh extension, name is an executable in the path
+			 * or a tcsh builtin command 
+			 */
+	    i = find_cmd(ep, 0);
+	    break;
+
+	case 't':	/* SGI extension, true when file is a tty */
+	    i = isatty(atoi(short2str(ep)));
+	    break;
+
+	default:
+
+#ifdef S_IFLNK
+	    if (tolower(*ft) == 'l') {
+		/* 
+		 * avoid convex compiler bug.
+		 */
+		if (!lst) {
+		    lst = &lstb;
+		    if (TCSH_LSTAT(short2str(ep), lst) == -1) {
+			xfree((ptr_t) ep);
+			return (Strsave(errval));
+		    }
+		}
+		if (*ft == 'L')
+		    st = lst;
+	    }
+	    else 
+#endif /* S_IFLNK */
+		/* 
+		 * avoid convex compiler bug.
+		 */
+		if (!st) {
+		    st = &stb;
+		    if (TCSH_STAT(short2str(ep), st) == -1) {
+			xfree((ptr_t) ep);
+			return (Strsave(errval));
+		    }
+		}
+
+	    switch (*ft) {
+
+	    case 'f':
+#ifdef S_ISREG
+		i = S_ISREG(st->st_mode);
+#else /* !S_ISREG */
+		i = 0;
+#endif /* S_ISREG */
+		break;
+
+	    case 'd':
+#ifdef S_ISDIR
+		i = S_ISDIR(st->st_mode);
+#else /* !S_ISDIR */
+		i = 0;
+#endif /* S_ISDIR */
+		break;
+
+	    case 'p':
+#ifdef S_ISFIFO
+		i = S_ISFIFO(st->st_mode);
+#else /* !S_ISFIFO */
+		i = 0;
+#endif /* S_ISFIFO */
+		break;
+
+	    case 'm' :
+#ifdef S_ISOFL
+	      i = S_ISOFL(st->st_dm_mode);
+#else /* !S_ISOFL */
+	      i = 0;
+#endif /* S_ISOFL */
+	      break ;
+
+	    case 'K' :
+#ifdef S_ISOFL
+	      i = stb.st_dm_key;
+#else /* !S_ISOFL */
+	      i = 0;
+#endif /* S_ISOFL */
+	      break ;
+  
+
+	    case 'l':
+#ifdef S_ISLNK
+		i = S_ISLNK(lst->st_mode);
+#else /* !S_ISLNK */
+		i = 0;
+#endif /* S_ISLNK */
+		break;
+
+	    case 'S':
+# ifdef S_ISSOCK
+		i = S_ISSOCK(st->st_mode);
+# else /* !S_ISSOCK */
+		i = 0;
+# endif /* S_ISSOCK */
+		break;
+
+	    case 'b':
+#ifdef S_ISBLK
+		i = S_ISBLK(st->st_mode);
+#else /* !S_ISBLK */
+		i = 0;
+#endif /* S_ISBLK */
+		break;
+
+	    case 'c':
+#ifdef S_ISCHR
+		i = S_ISCHR(st->st_mode);
+#else /* !S_ISCHR */
+		i = 0;
+#endif /* S_ISCHR */
+		break;
+
+	    case 'u':
+		i = (S_ISUID & st->st_mode) != 0;
+		break;
+
+	    case 'g':
+		i = (S_ISGID & st->st_mode) != 0;
+		break;
+
+	    case 'k':
+		i = (S_ISVTX & st->st_mode) != 0;
+		break;
+
+	    case 'z':
+		i = st->st_size == 0;
+		break;
+
+#ifdef convex
+	    case 'R':
+		i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED;
+		break;
+#endif /* convex */
+
+	    case 's':
+		i = stb.st_size != 0;
+		break;
+
+	    case 'e':
+		i = 1;
+		break;
+
+	    case 'o':
+		i = st->st_uid == uid;
+		break;
+
+		/*
+		 * Value operators are a tcsh extension.
+		 */
+
+	    case 'D':
+		i = (int) st->st_dev;
+		break;
+
+	    case 'I':
+		i = (int) st->st_ino;
+		break;
+		
+	    case 'F':
+		strdev = putn( (int) st->st_dev);
+		strino = putn( (int) st->st_ino);
+		strF = (Char *) xmalloc((size_t) (2 + Strlen(strdev) + 
+					 Strlen(strino)) * sizeof(Char));
+		(void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino);
+		xfree((ptr_t) strdev);
+		xfree((ptr_t) strino);
+		xfree((ptr_t) ep);
+		return(strF);
+		
+	    case 'L':
+		if ( *(ft + 1) ) {
+		    i = 1;
+		    break;
+		}
+#ifdef S_ISLNK
+		filnam = short2str(ep);
+#ifdef PATH_MAX
+# define MY_PATH_MAX PATH_MAX
+#else /* !PATH_MAX */
+/* 
+ * I can't think of any more sensible alterative; readlink doesn't give 
+ * us an errno if the buffer isn't large enough :-(
+ */
+# define MY_PATH_MAX  2048
+#endif /* PATH_MAX */
+		i = readlink(filnam, string = (char *) 
+		      xmalloc((size_t) (1 + MY_PATH_MAX) * sizeof(char)),
+			MY_PATH_MAX);
+		if (i >= 0 && i <= MY_PATH_MAX)
+		    string[i] = '\0'; /* readlink does not null terminate */
+		strF = (i < 0) ? errval : str2short(string);
+		xfree((ptr_t) string);
+		xfree((ptr_t) ep);
+		return(Strsave(strF));
+
+#else /* !S_ISLNK */
+		i = 0;
+		break;
+#endif /* S_ISLNK */
+		
+
+	    case 'N':
+		i = (int) st->st_nlink;
+		break;
+
+	    case 'P':
+		string = string0 + 1;
+		(void) xsnprintf(string, sizeof(string0) - 1, "%o",
+		    pmask & (unsigned int) 
+		    ((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode));
+		if (altout && *string != '0')
+		    *--string = '0';
+		xfree((ptr_t) ep);
+		return(Strsave(str2short(string)));
+
+	    case 'U':
+		if (altout && (pw = getpwuid(st->st_uid))) {
+		    xfree((ptr_t) ep);
+		    return(Strsave(str2short(pw->pw_name)));
+		}
+		i = (int) st->st_uid;
+		break;
+
+	    case 'G':
+		if ( altout && (gr = getgrgid(st->st_gid))) {
+		    xfree((ptr_t) ep);
+		    return(Strsave(str2short(gr->gr_name)));
+		}
+		i = (int) st->st_gid;
+		break;
+
+	    case 'Z':
+		i = (int) st->st_size;
+		break;
+
+	    case 'A': case 'M': case 'C':
+		footime = *ft == 'A' ? st->st_atime :
+		    *ft == 'M' ? st->st_mtime : st->st_ctime;
+		if (altout) {
+		    strF = str2short(ctime(&footime));
+		    if ((str = Strchr(strF, '\n')) != NULL)
+			*str = (Char) '\0';
+		    xfree((ptr_t) ep);
+		    return(Strsave(strF));
+		}
+		i = (int) footime;
+		break;
+
+	    }
+	}
+    while (*++ft && i);
+#ifdef EDEBUG
+    etraci("exp6 -? i", i, vp);
+#endif /* EDEBUG */
+    xfree((ptr_t) ep);
+    return (putn(i));
+}
+
+
+static void
+evalav(v)
+    register Char **v;
+{
+    struct wordent paraml1;
+    register struct wordent *hp = &paraml1;
+    struct command *t;
+    register struct wordent *wdp = hp;
+
+    set(STRstatus, Strsave(STR0), VAR_READWRITE);
+    hp->prev = hp->next = hp;
+    hp->word = STRNULL;
+    while (*v) {
+	register struct wordent *new =
+	(struct wordent *) xcalloc(1, sizeof *wdp);
+
+	new->prev = wdp;
+	new->next = hp;
+	wdp->next = new;
+	wdp = new;
+	wdp->word = Strsave(*v++);
+    }
+    hp->prev = wdp;
+    alias(&paraml1);
+    t = syntax(paraml1.next, &paraml1, 0);
+    if (seterr)
+	stderror(ERR_OLD);
+    execute(t, -1, NULL, NULL);
+    freelex(&paraml1), freesyn(t);
+}
+
+static int
+isa(cp, what)
+    register Char *cp;
+    register int what;
+{
+    if (cp == 0)
+	return ((what & RESTOP) != 0);
+    if (*cp == '\0')
+    	return 0;
+    if (cp[1] == 0) {
+	if (what & ADDOP && (*cp == '+' || *cp == '-'))
+	    return (1);
+	if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%'))
+	    return (1);
+	if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' ||
+			      *cp == '~' || *cp == '^' || *cp == '"'))
+	    return (1);
+    }
+    else if (cp[2] == 0) {
+	if (what & RESTOP) {
+	    if (cp[0] == '|' && cp[1] == '&')
+		return (1);
+	    if (cp[0] == '<' && cp[1] == '<')
+		return (1);
+	    if (cp[0] == '>' && cp[1] == '>')
+		return (1);
+	}
+	if (what & EQOP) {
+	    if (cp[0] == '=') {
+		if (cp[1] == '=')
+		    return (EQEQ);
+		if (cp[1] == '~')
+		    return (EQMATCH);
+	    }
+	    else if (cp[0] == '!') {
+		if (cp[1] == '=')
+		    return (NOTEQ);
+		if (cp[1] == '~')
+		    return (NOTEQMATCH);
+	    }
+	}
+    }
+    if (what & RELOP) {
+	if (*cp == '<')
+	    return (LSS);
+	if (*cp == '>')
+	    return (GTR);
+    }
+    return (0);
+}
+
+static int
+egetn(cp)
+    register Char *cp;
+{
+    if (*cp && *cp != '-' && !Isdigit(*cp))
+	stderror(ERR_NAME | ERR_EXPRESSION);
+    return (getn(cp));
+}
+
+/* Phew! */
+
+#ifdef EDEBUG
+static void
+etraci(str, i, vp)
+    char   *str;
+    int     i;
+    Char ***vp;
+{
+    xprintf("%s=%d\t", str, i);
+    blkpr(*vp);
+    xputchar('\n');
+}
+static void
+etracc(str, cp, vp)
+    char   *str;
+    Char   *cp;
+    Char ***vp;
+{
+    xprintf("%s=%s\t", str, cp);
+    blkpr(*vp);
+    xputchar('\n');
+}
+#endif /* EDEBUG */