/* $NetBSD: t_dir.c,v 1.11 2018/06/19 09:20:46 gson Exp $ */

/*-
 * Copyright (c) 2010 The NetBSD Foundation, Inc.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/stat.h>
#include <assert.h>
#include <atf-c.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>



ATF_TC(seekdir_basic);
ATF_TC_HEAD(seekdir_basic, tc)
{

        atf_tc_set_md_var(tc, "descr", "Check telldir(3) and seekdir(3) "
            "for correct behavior (PR lib/24324)");
}

ATF_TC_BODY(seekdir_basic, tc)
{
        DIR *dp;
        char *wasname;
        struct dirent *entry;
        long here;

#define CREAT(x, m)     do {                                            \
                int _creat_fd;                                          \
                ATF_REQUIRE_MSG((_creat_fd = creat((x), (m))) != -1,    \
                    "creat(%s, %x) failed: %s", (x), (m),               \
                    strerror(errno));                                   \
                (void)close(_creat_fd);                                 \
        } while (0)

        ATF_REQUIRE_MSG(mkdir("t", 0755) == 0,
            "mkdir failed: %s", strerror(errno));
        CREAT("t/a", 0600);
        CREAT("t/b", 0600);
        CREAT("t/c", 0600);

        dp = opendir("t");
        if ( dp == NULL)
                atf_tc_fail("Could not open temp directory.");

        /* skip two for . and .. */
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            ".", strerror(errno));

        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "..", strerror(errno));

        /* get first entry */
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "first", strerror(errno));

        here = telldir(dp);
        ATF_REQUIRE_MSG(here != -1, "telldir failed: %s", strerror(errno));

        /* get second entry */
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "second", strerror(errno));

        wasname = strdup(entry->d_name);
        if (wasname == NULL)
                atf_tc_fail("cannot allocate memory");

        /* get third entry */
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "third", strerror(errno));

        /* try to return to the position after the first entry */
        seekdir(dp, here);
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "first[1]", strerror(errno));
        if (strcmp(entry->d_name, wasname) != 0)
                atf_tc_fail("1st seekdir found wrong name");

        /* try again, and throw in a telldir() for good measure */
        seekdir(dp, here);
        here = telldir(dp);
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "second[1]", strerror(errno));
        if (strcmp(entry->d_name, wasname) != 0)
                atf_tc_fail("2nd seekdir found wrong name");

        /* One more time, to make sure that telldir() doesn't affect result */
        seekdir(dp, here);
        entry = readdir(dp);
        ATF_REQUIRE_MSG(entry != NULL, "readdir[%s] failed: %s",
            "third[1]", strerror(errno));

        if (strcmp(entry->d_name, wasname) != 0)
                atf_tc_fail("3rd seekdir found wrong name");

        closedir(dp);
        free(wasname);
}

ATF_TC(telldir_leak);
ATF_TC_HEAD(telldir_leak, tc)
{

        atf_tc_set_md_var(tc, "descr",
            "Check telldir(3) for memory leakage (PR lib/24324)");
}

ATF_TC_BODY(telldir_leak, tc)
{
        DIR *dp;
        char *memused;
        int i;
        int oktouse = 4096;

        dp = opendir(".");
        if (dp == NULL)
                atf_tc_fail("Could not open current directory");

        (void)telldir(dp);
        memused = sbrk(0);
        closedir(dp);

        for (i = 0; i < 1000; i++) {
                dp = opendir(".");
                if (dp == NULL)
                        atf_tc_fail("Could not open current directory");

                (void)telldir(dp);
                closedir(dp);

                if ((char *)sbrk(0) - memused > oktouse) {
                        (void)printf("Used %td extra bytes for %d telldir "
                            "calls", ((char *)sbrk(0) - memused), i);
                        oktouse = (char *)sbrk(0) - memused;
                }
        }
        if (oktouse > 4096) {
                atf_tc_fail("Failure: leaked %d bytes", oktouse);
        } else {
                (void)printf("OK: used %td bytes\n", (char *)(sbrk(0))-memused);
        }
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, seekdir_basic);
        ATF_TP_ADD_TC(tp, telldir_leak);

        return atf_no_error();
}