unsigned int *postred = (void *) hdr + hdr->size - sizeof(unsigned int);
hdr->prered = SMALLOC_PRE_RED;
*postred = SMALLOC_POST_RED;
unsigned int *postred = (void *) hdr + hdr->size - sizeof(unsigned int);
hdr->prered = SMALLOC_PRE_RED;
*postred = SMALLOC_POST_RED;