autofree.h: Hijack malloc and free on exit(), or autofree()

af.c

void *allocList_[1000];int allocn_=0;void *malloc_(long unsigned int n){
void *x=malloc(n);allocList_[allocn_]=x;allocn_++;return x;}void autofree(){
while (allocn_){allocn_--;free(allocList_[allocn_]);}}
#define malloc(x) malloc_(x)
#define exit(x) autofree(x);exit(x);