ucbcmd/test/test.c

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * test expression
 * [ expression ]
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>

#define EQ(a, b)    ((strcmp(a, b) == 0))

static char *nxtarg(int mt);
static int exp(void);
static int e1(void);
static int e2(void);
static int e3(void);
static int tio(char *a, int f);
static int ftype(char *f, int field);
static int filtyp(char *f, int field);
static int fsizep(char *f);
static void synbad(char *s1, char *s2);

static int  ap;
static int  ac;
static char **av;

int
main(int argc, char *argv[])
{
    int status;

    ac = argc; av = argv; ap = 1;
    if (EQ(argv[0], "[")) {
        if (!EQ(argv[--ac], "]"))
            synbad("] missing", "");
    }
    argv[ac] = 0;
    if (ac <= 1)
        exit(1);
    status = (exp() ? 0 : 1);
    if (nxtarg(1) != 0)
        synbad("too many arguments", "");
    return (status);
}

static char *
nxtarg(int mt)
{
    if (ap >= ac) {
        if (mt) {
            ap++;
            return (0);
        }
        synbad("argument expected", "");
    }
    return (av[ap++]);
}

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

    p1 = e1();
    p2 = nxtarg(1);
    if (p2 != 0) {
        if (EQ(p2, "-o"))
            return (p1 | exp());
        if (EQ(p2, "]"))
            synbad("syntax error", "");
    }
    ap--;
    return (p1);
}

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

    p1 = e2();
    p2 = nxtarg(1);
    if ((p2 != 0) && EQ(p2, "-a"))
        return (p1 & e1());
    ap--;
    return (p1);
}

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

static int
e3(void)
{
    int p1;
    char *a;
    char *p2;
    int int1, int2;

    a = nxtarg(0);
    if (EQ(a, "(")) {
        p1 = exp();
        if (!EQ(nxtarg(0), ")")) synbad(") expected", "");
        return (p1);
    }
    p2 = nxtarg(1);
    ap--;
    if ((p2 == 0) || (!EQ(p2, "=") && !EQ(p2, "!="))) {
        if (EQ(a, "-r"))
            return (tio(nxtarg(0), 4));

        if (EQ(a, "-w"))
            return (tio(nxtarg(0), 2));

        if (EQ(a, "-x"))
            return (tio(nxtarg(0), 1));

        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")) {
            struct stat statb;

            return (stat(nxtarg(0), &statb) >= 0 &&
                (statb.st_mode & S_IFMT) != S_IFDIR);
        }

        if (EQ(a, "-h"))
            return (filtyp(nxtarg(0), S_IFLNK));

        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"))
#ifdef S_IFIFO
            return (filtyp(nxtarg(0), S_IFIFO));
#else
            return (nxtarg(0), 0);
#endif

        if (EQ(a, "-s"))
            return (fsizep(nxtarg(0)));

        if (EQ(a, "-t"))
            if (ap >= ac)
                return (isatty(1));
            else if (EQ((a = nxtarg(0)), "-a") || EQ(a, "-o")) {
                ap--;
                return (isatty(1));
            } else
                return (isatty(atoi(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));

    int1 = atoi(a);
    int2 = atoi(nxtarg(0));
    if (EQ(p2, "-eq"))
        return (int1 == int2);
    if (EQ(p2, "-ne"))
        return (int1 != int2);
    if (EQ(p2, "-gt"))
        return (int1 > int2);
    if (EQ(p2, "-lt"))
        return (int1 < int2);
    if (EQ(p2, "-ge"))
        return (int1 >= int2);
    if (EQ(p2, "-le"))
        return (int1 <= int2);

    synbad("unknown operator ", p2);
    /* NOTREACHED */
    return (0);
}

static int
tio(char *a, int f)
{
    if (access(a, f) == 0)
        return (1);
    else
        return (0);
}

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

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

static int
filtyp(char *f, int field)
{
    struct stat statb;

    if (field == S_IFLNK) {
        if (lstat(f, &statb) < 0)
            return (0);
    } else {
        if (stat(f, &statb) < 0)
            return (0);
    }
    if ((statb.st_mode & S_IFMT) == field)
        return (1);
    else
        return (0);
}

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

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

static void
synbad(char *s1, char *s2)
{
    (void) write(2, "test: ", 6);
    (void) write(2, s1, strlen(s1));
    (void) write(2, s2, strlen(s2));
    (void) write(2, "\n", 1);
    exit(255);
}