#include"a.h"
#undef malloc
#undef realloc
#undef free
#undef fopen
NR V die(IM C*f,...)VA(f,vfprintf(stderr,f,ap),fputc('\n',stderr),exit(1))
V asrt(B b,IM C*m){N(b,die(m))}
V*mk(W sz){V*p;N(p=calloc(1,sz),die("oom"))R p;}
V*remk(V*p,W sz){N(p=realloc(p,sz),die("oom"))R p;}
V del(V*p){free(p);}
F xopen(IM C*n,IM C*p){F f;N(f=fopen(n,p),die("unable to open file `%s`",n))R f;}