ref: adf3227845db11bde5f89abc0ca54864c4f8747d dir: /util.h/
#define Zns₀ (~0ULL) void *emalloc(usize sz); void *ecalloc(ulong nel, usize elsz); void *erealloc(void *p, usize sz); char *estrndup(void *d, int n); char *estrdup(char *s);