typedef unsigned char byte;

#define KSTR(s) s, (sizeof(s) - 1)
#define KSTR_LEN(s) (sizeof(s) - 1)
#define arrsz(a) (sizeof(a)/sizeof(a[0]))
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)

#define warn(...) do{fprintf(stderr, "WARN " __VA_ARGS__); }while(0)
#define warnsys(...) do{fprintf(stderr, "WARN " __VA_ARGS__); perror(" sys"); }while(0)
#define die(...) do{fprintf(stderr, __VA_ARGS__); exit(1); }while(0)
#define diesys(...) do{fprintf(stderr, __VA_ARGS__); perror(" sys"); exit(1);}while(0)

#define debug(...) do{fprintf(stderr, __VA_ARGS__); }while(0)

#define unless(x) if(!(x))

#define assert(c) if(!(c)){ fputs("assertion failed: " __FILE__ ":" TOSTRING(__LINE__) ": " #c "\n", stderr); __builtin_trap(); }

#define log(...) do { \
  struct timespec ts; \
  clock_gettime(CLOCK_REALTIME, &ts); \
  struct tm tm; \
  char ts_buf[32]; \
  strftime(ts_buf, sizeof(ts_buf), "%Y-%m-%d %H:%M:%S", gmtime_r(&ts.tv_sec, &tm)); \
  fprintf(stderr, "[%s.%03ldZ] ", ts_buf, ts.tv_nsec / 1000000); \
  fprintf(stderr, __VA_ARGS__); \
} while(0)

typedef uint8_t  byte;
typedef uint8_t  u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t   i8;
typedef int16_t  i16;
typedef int32_t  i32;
typedef int64_t  i64;