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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);
}
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