// SPDX-License-Identifier: BSD-3-Clause

/* Copyright (C) 2018 - 2020 Intel Corporation. */

#include <memkind.h>

#include <limits.h>

#include <stdio.h>

#include <stdlib.h>

#define MB (1024 * 1024)

static char path[PATH_MAX]="/tmp/";

static void print_err_message(int err)

{

    char error_message[MEMKIND_ERROR_MESSAGE_SIZE];

    memkind_error_message(err, error_message, MEMKIND_ERROR_MESSAGE_SIZE);

    fprintf(stderr, "%s\n", error_message);

}

int main(int argc, char *argv[])

{

    struct memkind *pmem_kind_unlimited = NULL;

    int err = 0;

    if (argc > 2) {

        fprintf(stderr, "Usage: %s [pmem_kind_dir_path]\n", argv[0]);

        return 1;

    } else if (argc == 2 && (realpath(argv[1], path) == NULL)) {

        fprintf(stderr, "Incorrect pmem_kind_dir_path %s\n", argv[1]);

        return 1;

    }

    fprintf(stdout,

            "This example shows difference between the expected and the actual allocation size."

            "\nPMEM kind directory: %s\n", path);

    err = memkind_create_pmem(path, 0, &pmem_kind_unlimited);

    if (err) {

        print_err_message(err);

        return 1;

    }

    char *pmem_str10 = NULL;

    char *pmem_str11 = NULL;

    char *pmem_str12 = NULL;

    // 32 bytes allocation

    pmem_str10 = (char *)memkind_malloc(pmem_kind_unlimited, 32);

    if (pmem_str10 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str10).\n");

        return 1;

    }

    // Check real usable size for this allocation

    if (memkind_malloc_usable_size(pmem_kind_unlimited, pmem_str10) != 32) {

        fprintf(stderr, "Wrong usable size for small allocation (pmem_str10).\n");

        return 1;

    }

    // 31 bytes allocation

    pmem_str11 = (char *)memkind_malloc(pmem_kind_unlimited, 31);

    if (pmem_str11 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str11).\n");

        return 1;

    }

    // Check real usable size for this allocation, its 32 again

    if (memkind_malloc_usable_size(pmem_kind_unlimited, pmem_str11) != 32) {

        fprintf(stderr, "Wrong usable size for small allocation (pmem_str11).\n");

        return 1;

    }

    // 33 bytes allocation

    pmem_str12 = (char *)memkind_malloc(pmem_kind_unlimited, 33);

    if (pmem_str12 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str12).\n");

        return 1;

    }

    // Check real usable size for this allocation, its 48 now

    if (memkind_malloc_usable_size(pmem_kind_unlimited, pmem_str12) != 48) {

        fprintf(stderr, "Wrong usable size for small allocation (pmem_str12).\n");

        return 1;

    }

    memkind_free(pmem_kind_unlimited, pmem_str10);

    memkind_free(pmem_kind_unlimited, pmem_str11);

    memkind_free(pmem_kind_unlimited, pmem_str12);

    // 5MB allocation

    pmem_str10 = (char *)memkind_malloc(pmem_kind_unlimited, 5 * MB);

    if (pmem_str10 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str10).\n");

        return 1;

    }

    // Check real usable size for this allocation

    if (memkind_malloc_usable_size(pmem_kind_unlimited, pmem_str10) != 5 * MB) {

        fprintf(stderr, "Wrong usable size for large allocation (pmem_str10).\n");

        return 1;

    }

    // 5MB + 1B allocation

    pmem_str11 = (char *)memkind_malloc(pmem_kind_unlimited, 5 * MB + 1);

    if (pmem_str11 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str11).\n");

        return 1;

    }

    // Check real usable size for this allocation, its 6MB now

    if (memkind_malloc_usable_size(pmem_kind_unlimited, pmem_str11) != 6 * MB) {

        fprintf(stderr, "Wrong usable size for large allocation (pmem_str11).\n");

        return 1;

    }

    memkind_free(pmem_kind_unlimited, pmem_str10);

    memkind_free(pmem_kind_unlimited, pmem_str11);

    err = memkind_destroy_kind(pmem_kind_unlimited);

    if (err) {

        print_err_message(err);

        return 1;

    }

    fprintf(stdout,

            "The real size of the allocation has been successfully read.\n");

    return 0;

}