程序代码：

// 目的：malloc 函数实现方式探索
// 平台：VC6.0 20100815

#include   <stdio.h> 

#include   <stdlib.h>
#include   <malloc.h>
#include   <assert.h>

char *Alloc_CHAR_Array(long length)
{
    char *array = NULL;
   

    if( NULL == (array = (char *)malloc(sizeof(char) * length) ) )
    {
        fprintf(stdout, "Merory Exhausted\n");
        return NULL;
    }
    //memset(array, 0, length*sizeof(double));
    return array;
}

void Free_Array (char **array)
{   

    assert( array != NULL);
    printf("array=0x%p,*array=0x%p\n",array,*array);
    free(*array);
}

int main() 

{ 

    char *p1 = Alloc_CHAR_Array(0x100);
    char *p2 = Alloc_CHAR_Array(0x100);
    printf("p1=0x%p,p2=0x%p\n",p1,p2);
    p1[0] = '1';
    p2[0] = '2';

    // 验证 Free_Array 正确的释放了空间
    Free_Array(&p1);
    p1 = Alloc_CHAR_Array(0x100);
    p1[0] = '1'; 

    p2[0] = '2';
    printf("p1=0x%p,p2=0x%p\n",p1,p2);
   

    //

    Free_Array(&p2);
    p2 = Alloc_CHAR_Array(0x90);

    printf("p1=0x%p,p2+0x90=0x%p\n",p1,p2+0x90); 

    char *p3 = Alloc_CHAR_Array(0x10);
    printf("p1=0x%p,p2=0x%p,p3=0x%p\n",p1,p2,p3);

    printf("p1=0x%p,p3+0x10=0x%p\n",p1,p3+0x10);
    p3 = Alloc_CHAR_Array(0x10);
    printf("p1=0x%p,p2=0x%p,p3=0x%p\n",p1,p2,p3);
   

    return 0;
}