/*
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright © 2024, Synopsys Inc.
 *
 * 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. Neither the name of the copyright holder 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDER 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.
 */
#define __STDC_WANT_LIB_EXT1__ 1
#include <string.h>
#include <stdbool.h>
#include "string_private.h"

__errno_t
memcpy_s(void *restrict s1, rsize_t s1max, const void *restrict s2, rsize_t n)
{
    const char *msg = "";

    if (s1 == NULL) {
        msg = "memcpy_s: dest is NULL";
        goto handle_error;
    }

    if (CHECK_RSIZE(s1max)) {
        msg = "memcpy_s: buffer size exceeds RSIZE_MAX";
        goto handle_error;
    }

    if (s2 == NULL) {
        msg = "memcpy_s: source is NULL";
        goto handle_error;
    }

    if (CHECK_RSIZE(n)) {
        msg = "memcpy_s: copy count exceeds RSIZE_MAX";
        goto handle_error;
    }

    if (n > s1max) {
        msg = "memcpy_s: copy count exceeds buffer size";
        goto handle_error;
    }

    const char *s1cp = (const char *)s1;
    const char *s2cp = (const char *)s2;
    const char *s1cp_limit = &s1cp[n];
    const char *s2cp_limit = &s2cp[n];

    if (((s1cp_limit <= s2cp) || (s2cp_limit <= s1cp)) == false) {
        msg = "memcpy_s: overlapping copy";
        goto handle_error;
    }

    // Normal return path
    (void)memcpy(s1, s2, n);
    return 0;

handle_error:
    if (s1 != NULL) {
        (void)memset(s1, (int32_t)'\0', s1max);
    }

    if (__cur_handler != NULL) {
        __cur_handler(msg, NULL, -1);
    }

    return -1;
}
