/* $NetBSD: t_memset.c,v 1.5 2024/11/02 02:43:48 riastradh Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jukka Ruohonen.
 *
 * 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/cdefs.h>
__RCSID("$NetBSD: t_memset.c,v 1.5 2024/11/02 02:43:48 riastradh Exp $");

#include <sys/stat.h>

#include <atf-c.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static long     page = 0;
static void     fill(char *, size_t, char);
static bool     check(char *, size_t, char);

int zero;       /* always zero, but the compiler does not know */

static const struct {
        const char      *name;
        void            *(*fn)(void *, int, size_t);
} memsetfn[] = {
        { "memset", &memset },
        { "explicit_memset", &explicit_memset }, /* NetBSD extension */
        { "memset_explicit", &memset_explicit }, /* C23 adopted name */
};

ATF_TC(memset_array);
ATF_TC_HEAD(memset_array, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test memset(3) with arrays");
}

ATF_TC_BODY(memset_array, tc)
{
        char buf[1024];
        unsigned i;

        for (i = 0; i < __arraycount(memsetfn); i++) {
                (void)(*memsetfn[i].fn)(buf, 0, sizeof(buf));
                ATF_CHECK_MSG(check(buf, sizeof(buf), 0),
                    "%s did not fill a static buffer",
                    memsetfn[i].name);

                (void)(*memsetfn[i].fn)(buf, 'x', sizeof(buf));
                ATF_CHECK_MSG(check(buf, sizeof(buf), 'x'),
                    "%s did not fill a static buffer",
                    memsetfn[i].name);
        }
}

ATF_TC(memset_return);
ATF_TC_HEAD(memset_return, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test memset(3) return value");
}

ATF_TC_BODY(memset_return, tc)
{
        char *b = (char *)0x1;
        char c[2];
        char *p;
        unsigned i;

        for (i = 0; i < __arraycount(memsetfn); i++) {
                ATF_CHECK_EQ_MSG((p = (*memsetfn[i].fn)(b, 0, 0)), b,
                    "%s: returned %p, expected %p", memsetfn[i].name, p, b);
                ATF_CHECK_EQ_MSG((p = (*memsetfn[i].fn)(c, 2, sizeof(c))), c,
                    "%s: returned %p, expected %p", memsetfn[i].name, p, c);
        }
}

ATF_TC(memset_basic);
ATF_TC_HEAD(memset_basic, tc)
{
        atf_tc_set_md_var(tc, "descr", "A basic test of memset(3)");
}

ATF_TC_BODY(memset_basic, tc)
{
        char *buf, *ret;
        unsigned i;

        buf = malloc(page);
        ret = malloc(page);

        ATF_REQUIRE(buf != NULL);
        ATF_REQUIRE(ret != NULL);

        for (i = 0; i < __arraycount(memsetfn); i++) {
                fill(ret, page, 0);
                (*memsetfn[i].fn)(buf, 0, page);

                ATF_CHECK_EQ_MSG(memcmp(ret, buf, page), 0, "%s",
                    memsetfn[i].name);

                fill(ret, page, 'x');
                (*memsetfn[i].fn)(buf, 'x', page);

                ATF_CHECK_EQ_MSG(memcmp(ret, buf, page), 0, "%s",
                    memsetfn[i].name);
        }

        free(buf);
        free(ret);
}

ATF_TC(memset_nonzero);
ATF_TC_HEAD(memset_nonzero, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test memset(3) with non-zero params");
}

ATF_TC_BODY(memset_nonzero, tc)
{
        const size_t n = 0x7f;
        char *buf;
        size_t i, j;

        buf = malloc(page);
        ATF_REQUIRE(buf != NULL);

        for (i = 0x21; i < n; i++) {
                for (j = 0; j < __arraycount(memsetfn); j++) {
                        (void)(*memsetfn[j].fn)(buf, i, page);
                        ATF_CHECK_MSG(check(buf, page, i),
                            "%s did not fill properly with %zu",
                            memsetfn[j].name, i);
                }
        }

        free(buf);
}

ATF_TC(memset_zero_size);

ATF_TC_HEAD(memset_zero_size, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test memset(3) with zero size");
}

ATF_TC_BODY(memset_zero_size, tc)
{
        char buf[1024];
        unsigned i;

        for (i = 0; i < __arraycount(memsetfn); i++) {
                (void)(*memsetfn[i].fn)(buf, 'x', sizeof(buf));
                ATF_CHECK_MSG(check(buf, sizeof(buf), 'x'),
                    "%s did not fill a static buffer",
                    memsetfn[i].name);

                (void)memset(buf+sizeof(buf)/2, 0, zero);
                ATF_CHECK_MSG(check(buf, sizeof(buf), 'x'),
                    "%s with 0 size did change the buffer",
                    memsetfn[i].name);
        }
}

ATF_TC(bzero_zero_size);

ATF_TC_HEAD(bzero_zero_size, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test bzero(3) with zero size");
}

ATF_TC_BODY(bzero_zero_size, tc)
{
        char buf[1024];

        (void)memset(buf, 'x', sizeof(buf));

        if (check(buf, sizeof(buf), 'x') != true)
                atf_tc_fail("memset(3) did not fill a static buffer");

        (void)bzero(buf+sizeof(buf)/2, zero);

        if (check(buf, sizeof(buf), 'x') != true)
                atf_tc_fail("bzero(3) with 0 size did change the buffer");
}

ATF_TC(memset_struct);
ATF_TC_HEAD(memset_struct, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test memset(3) with a structure");
}

ATF_TC_BODY(memset_struct, tc)
{
        struct stat st;
        unsigned i;

        for (i = 0; i < __arraycount(memsetfn); i++) {
                st.st_dev = 0;
                st.st_ino = 1;
                st.st_mode = 2;
                st.st_nlink = 3;
                st.st_uid = 4;
                st.st_gid = 5;
                st.st_rdev = 6;
                st.st_size = 7;
                st.st_atime = 8;
                st.st_mtime = 9;

                (void)(*memsetfn[i].fn)(&st, 0, sizeof(struct stat));

                ATF_CHECK_MSG(st.st_dev == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_ino == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_mode == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_nlink == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_uid == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_gid == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_rdev == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_size == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_atime == 0, "%s", memsetfn[i].name);
                ATF_CHECK_MSG(st.st_mtime == 0, "%s", memsetfn[i].name);
        }
}

static void
fill(char *buf, size_t len, char x)
{
        size_t i;

        for (i = 0; i < len; i++)
                buf[i] = x;
}

static bool
check(char *buf, size_t len, char x)
{
        size_t i;

        for (i = 0; i < len; i++) {

                if (buf[i] != x)
                        return false;
        }

        return true;
}

ATF_TP_ADD_TCS(tp)
{

        page = sysconf(_SC_PAGESIZE);
        ATF_REQUIRE(page >= 0);

        ATF_TP_ADD_TC(tp, memset_array);
        ATF_TP_ADD_TC(tp, memset_basic);
        ATF_TP_ADD_TC(tp, memset_nonzero);
        ATF_TP_ADD_TC(tp, memset_struct);
        ATF_TP_ADD_TC(tp, memset_return);
        ATF_TP_ADD_TC(tp, memset_zero_size);
        ATF_TP_ADD_TC(tp, bzero_zero_size);

        return atf_no_error();
}