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#ifndef RUNE_INTERNAL_COMMON_H
#define RUNE_INTERNAL_COMMON_H
#if __STDC_VERSION__ >= 202311L
# define RUNE_IS_23 1
#endif
#if !RUNE_IS_23
# include <stddef.h> /* IWYU pragma: export */
# define nullptr NULL
#endif
#ifndef unreachable
# if RUNE_IS_23
# include <stddef.h> /* IWYU pragma: export */
# elif defined(__GNUC__) || defined(__clang__)
# define unreachable() __builtin_unreachable()
# else
# define unreachable() \
do \
*(int *)0 = 0; \
while (0)
# endif
#endif
#define U1(x) (((x)&0x80) == 0x00)
#define U2(x) (((x)&0xE0) == 0xC0)
#define U3(x) (((x)&0xF0) == 0xE0)
#define U4(x) (((x)&0xF8) == 0xF0)
#define UC(x) (((x)&0xC0) == 0x80)
/* Maximum value of a 1–4-byte long UTF-8 sequence */
#include "rune.h"
#define _1B_MAX RUNE_C(0x00007F)
#define _2B_MAX RUNE_C(0x0007FF)
#define _3B_MAX RUNE_C(0x00FFFF)
#define _4B_MAX RUNE_C(0x10FFFF)
#endif /* !RUNE_INTERNAL_COMMON_H */
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