/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/*
 *      test expression
 *      [ expression ]
 */

#include        "defs.h"
#include <sys/types.h>
#include <sys/stat.h>

extern  int lstat();

int     ap, ac;
unsigned char **av;

int
test(int argn, unsigned char *com[])
{
        ac = argn;
        av = com;
        ap = 1;
        if (eq(com[0],"["))
        {
                if (!eq(com[--ac], "]"))
                        failed((unsigned char *)"test", nobracket);
        }
        com[ac] = 0;
        if (ac <= 1)
                return(1);
        return(exp() ? 0 : 1);
}

unsigned char *
nxtarg(int mt)
{
        if (ap >= ac)
        {
                if (mt)
                {
                        ap++;
                        return(0);
                }
                failed((unsigned char *)"test", noarg);
        }
        return(av[ap++]);
}

int
exp(void)
{
        int     p1;
        unsigned char   *p2;

        p1 = e1();
        p2 = nxtarg(1);
        if (p2 != 0)
        {
                if (eq(p2, "-o"))
                        return(p1 | exp());

                /* if (!eq(p2, ")"))
                        failed((unsigned char *)"test", synmsg); */
        }
        ap--;
        return(p1);
}

int
e1(void)
{
        int     p1;
        unsigned char   *p2;

        p1 = e2();
        p2 = nxtarg(1);

        if ((p2 != 0) && eq(p2, "-a"))
                return(p1 & e1());
        ap--;
        return(p1);
}

int
e2(void)
{
        if (eq(nxtarg(0), "!"))
                return(!e3());
        ap--;
        return(e3());
}

int
e3(void)
{
        int     p1;
        unsigned char   *a;
        unsigned char   *p2;
        longlong_t      ll_1, ll_2;

        a = nxtarg(0);
        if (eq(a, "("))
        {
                p1 = exp();
                if (!eq(nxtarg(0), ")"))
                        failed((unsigned char *)"test", noparen);
                return(p1);
        }
        p2 = nxtarg(1);
        ap--;
        if ((p2 == 0) || (!eq(p2, "=") && !eq(p2, "!=")))
        {
                if (eq(a, "-r"))
                        return(chk_access(nxtarg(0), S_IREAD, 0) == 0);
                if (eq(a, "-w"))
                        return(chk_access(nxtarg(0), S_IWRITE, 0) == 0);
                if (eq(a, "-x"))
                        return(chk_access(nxtarg(0), S_IEXEC, 0) == 0);
                if (eq(a, "-d"))
                        return(filtyp(nxtarg(0), S_IFDIR));
                if (eq(a, "-c"))
                        return(filtyp(nxtarg(0), S_IFCHR));
                if (eq(a, "-b"))
                        return(filtyp(nxtarg(0), S_IFBLK));
                if (eq(a, "-f"))
                        if (ucb_builtins) {
                                struct stat statb;

                                return(stat((char *)nxtarg(0), &statb) >= 0 &&
                                        (statb.st_mode & S_IFMT) != S_IFDIR);
                        }
                        else
                                return(filtyp(nxtarg(0), S_IFREG));
                if (eq(a, "-u"))
                        return(ftype(nxtarg(0), S_ISUID));
                if (eq(a, "-g"))
                        return(ftype(nxtarg(0), S_ISGID));
                if (eq(a, "-k"))
                        return(ftype(nxtarg(0), S_ISVTX));
                if (eq(a, "-p"))
                        return(filtyp(nxtarg(0), S_IFIFO));
                if (eq(a, "-h") || eq(a, "-L"))
                        return(filtyp(nxtarg(0), S_IFLNK));
                if (eq(a, "-s"))
                        return(fsizep(nxtarg(0)));
                if (eq(a, "-t"))
                {
                        if (ap >= ac)           /* no args */
                                return(isatty(1));
                        else if (eq((a = nxtarg(0)), "-a") || eq(a, "-o"))
                        {
                                ap--;
                                return(isatty(1));
                        }
                        else
                                return(isatty(atoi((char *)a)));
                }
                if (eq(a, "-n"))
                        return(!eq(nxtarg(0), ""));
                if (eq(a, "-z"))
                        return(eq(nxtarg(0), ""));
        }

        p2 = nxtarg(1);
        if (p2 == 0)
                return(!eq(a, ""));
        if (eq(p2, "-a") || eq(p2, "-o"))
        {
                ap--;
                return(!eq(a, ""));
        }
        if (eq(p2, "="))
                return(eq(nxtarg(0), a));
        if (eq(p2, "!="))
                return(!eq(nxtarg(0), a));
        ll_1 = strtoll((char *)a, NULL, 10);
        ll_2 = strtoll((char *)nxtarg(0), NULL, 10);
        if (eq(p2, "-eq"))
                return (ll_1 == ll_2);
        if (eq(p2, "-ne"))
                return (ll_1 != ll_2);
        if (eq(p2, "-gt"))
                return (ll_1 > ll_2);
        if (eq(p2, "-lt"))
                return (ll_1 < ll_2);
        if (eq(p2, "-ge"))
                return (ll_1 >= ll_2);
        if (eq(p2, "-le"))
                return (ll_1 <= ll_2);

        bfailed((unsigned char *)btest, badop, p2);
/* NOTREACHED */
}

int
ftype(unsigned char *f, int field)
{
        struct stat statb;

        if (stat((char *)f, &statb) < 0)
                return(0);
        if ((statb.st_mode & field) == field)
                return(1);
        return(0);
}

int
filtyp(unsigned char *f, int field)
{
        struct stat statb;
        int (*statf)() = (field == S_IFLNK) ? lstat : stat;

        if ((*statf)(f, &statb) < 0)
                return(0);
        if ((statb.st_mode & S_IFMT) == field)
                return(1);
        else
                return(0);
}


int
fsizep(unsigned char *f)
{
        struct stat statb;

        if (stat((char *)f, &statb) < 0)
                return(0);
        return(statb.st_size > 0);
}