rt-thread/examples/libc/memory.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2010-11-17     Bernard      first version
 */

#include <stdio.h>
#include <stdlib.h>
#include <finsh.h>
#include <sys/errno.h>

static int errors = 0;
static void merror(const char *msg)
{
    ++errors;
    printf("Error: %s\n", msg);
}

int libc_mem(void)
{
    void *p;
    int save;

    errno = 0;

    p = malloc(-1);
    save = errno;

    if (p != NULL)
        merror("malloc (-1) succeeded.");

    if (p == NULL && save != ENOMEM)
        merror("errno is not set correctly");

    p = malloc(10);
    if (p == NULL)
        merror("malloc (10) failed.");

    /* realloc (p, 0) == free (p).  */
    p = realloc(p, 0);
    if (p != NULL)
        merror("realloc (p, 0) failed.");

    p = malloc(0);
    if (p == NULL)
    {
        printf("malloc(0) returns NULL\n");
    }

    p = realloc(p, 0);
    if (p != NULL)
        merror("realloc (p, 0) failed.");

    return errors != 0;
}