#include <malloc.h>
#include <stdio.h>
#include <windows.h>

int main() {
    HANDLE h = GetProcessHeap();
    printf("process heap handle: %p\n", h);
    fflush(stdout);

    /* validate before any alloc */
    BOOL v0 = HeapValidate(h, 0, NULL);
    printf("before alloc: HeapValidate=%d\n", v0);
    fflush(stdout);

    void *p = malloc(1024);
    BOOL v1 = HeapValidate(h, 0, NULL);
    printf("after malloc(1024): HeapValidate=%d (p=%p)\n", v1, p);
    fflush(stdout);

    /* intentionally overflow */
    memset((char*)p + 1024, 0xCC, 64);

    BOOL v2 = HeapValidate(h, 0, NULL);
    printf("after overflow: HeapValidate=%d\n", v2);
    fflush(stdout);

    /* try to trigger detection via free */
    free(p);
    BOOL v3 = HeapValidate(h, 0, NULL);
    printf("after free: HeapValidate=%d\n", v3);
    fflush(stdout);
    return 0;
}