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#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#define N_PTRS 1000

#define N_ALLOCS 10000

#define MAX_SIZE 0x10000

#define random_size()   (random()%MAX_SIZE)

#define random_ptr()    (random()%N_PTRS)

void test1(void);

void test2(void);

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

{

        test1();

        test2();

        return 0;

}

void test1(void)

{

        void **ptrs;

        int i,j;

        int size;

        srandom(0x19730929);

        ptrs = malloc(N_PTRS*sizeof(void *));

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

                ptrs[i]=malloc(random_size());

        }

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

                j=random_ptr();

                free(ptrs[j]);

                size=random_size();

                ptrs[j]=malloc(size);

                if(!ptrs[j]){

                        printf("malloc failed! %d\n",i);

                }

                memset(ptrs[j],0,size);

        }

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

                free(ptrs[i]);

        }

}

void test2(void)

{

        void *ptr = NULL;

        ptr = realloc(ptr,100);

        if(!ptr){

                printf("couldn't realloc() a NULL pointer\n");

        }else{

                free(ptr);

        }

        ptr = malloc(100);

        ptr = realloc(ptr, 0);

        if(ptr){

                printf("realloc(,0) failed\n");

                free(ptr);

        }

}