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#include <stdio.h>

#include <stdlib.h>

#include <string.h>

struct list {

        struct list *next;

};

int main(void)

{

        int z=999;

        int *y=&z;

        int *x=NULL;

        struct list *save;

        struct list *lp;

        int i;

        printf("pointer to x is %p\n", x);

        printf("pointer to y is %p\n", y);

        x=malloc(sizeof(int)*2000);

        printf("pointer to x is %p\n", x);

        y=malloc(sizeof(int)*100);

        printf("pointer to y is %p\n", y);

        free(x);

        free(y);

        printf("about to free(0)\n");

        free(0);

        x=malloc(13);

        printf("x = %p\n", x);

        memcpy(x, "Small string", 13);

        printf("0x%p test string1: %s\n", x, (char *)x);

        y = realloc(x, 36);

        printf("0x%p test string1: %s\n", y, (char *)y);

        memcpy(y, "********** Larger string **********", 36);

        printf("0x%p test string2: %s\n", y, (char *)y);

        free(y);

        printf("Allocate 100 nodes 500 bytes each\n");

        save = 0;

        for (i=0; i<100; i++) {

                lp = malloc(500);

                if (lp == 0) {

                        printf("loop 1: malloc returned 0\n");

                        goto Failed;

                }

                lp->next = save;

                save = lp;

        }

        printf("freeing 100 nodes\n");

        while (save) {

                lp = save;

                save = save->next;

                free(lp);

        }

        printf("try realloc 100 times \n");

        lp = 0;

        for (i=1; i<=100; i++) {

                lp = realloc(lp, i*200);

                if (lp == 0) {

                        printf("loop 3: realloc returned 0\n");

                        goto Failed;

                }

        }

        realloc(lp, 0);

        printf("Allocate another 100 nodes 600 bytes each\n");

        save = 0;

        for (i=0; i<100; i++) {

                lp = malloc(600);

                if (lp == 0) {

                        printf("loop 2: malloc returned 0\n");

                        goto Failed;

                }

                lp->next = save;

                save = lp;

        }

        printf("freeing 100 nodes\n");

        while (save) {

                lp = save;

                save = save->next;

                free(lp);

        }

        printf("alloc test PASSED\n");

        exit(0);

Failed:

        printf("!!!!!!!!!!!! alloc test FAILED. !!!!!!!!!!!!!!!\n");

        exit(1);

}