How to check the size allocated by malloc

#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char ** argv)
{
    for(int i = 1; i < 1000; i++)
    {
        size_t *p = (size_t *) malloc(i * sizeof(size_t));
        printf("%zu = %d * %zu\n", *(p - 1), i * sizeof(size_t));
    }
    return 0;
}

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