1 files changed, 39 insertions, 0 deletions
diff --git a/vendor/librune/include/internal/common.h b/vendor/librune/include/internal/common.h
new file mode 100644
index 0000000..7107528
--- /dev/null
+++ b/vendor/librune/include/internal/common.h
@@ -0,0 +1,39 @@
+#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 */