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Signed-off-by: Slendi <slendi@socopon.com>

src/common.hpp

@@ -0,0 +1,36 @@
+#include <cstdint>
+
+using u8 = std::uint8_t;
+using i8 = std::int8_t;
+using u16 = std::uint16_t;
+using i16 = std::int16_t;
+using u32 = std::uint32_t;
+using i32 = std::int32_t;
+using u64 = std::uint64_t;
+using i64 = std::int64_t;
+using usize = std::uintptr_t;
+using isize = std::intptr_t;
+
+inline auto rune_to_string(uint32_t cp) -> char const * {
+  static char utf8[5] = {0};
+  for (auto &c : utf8)
+    c = 0;
+
+  if (cp < 0x80) {
+    utf8[0] = cp;
+  } else if (cp < 0x800) {
+    utf8[0] = 0xC0 | (cp >> 6);
+    utf8[1] = 0x80 | (cp & 0x3F);
+  } else if (cp < 0x10000) {
+    utf8[0] = 0xE0 | (cp >> 12);
+    utf8[1] = 0x80 | ((cp >> 6) & 0x3F);
+    utf8[2] = 0x80 | (cp & 0x3F);
+  } else {
+    utf8[0] = 0xF0 | (cp >> 18);
+    utf8[1] = 0x80 | ((cp >> 12) & 0x3F);
+    utf8[2] = 0x80 | ((cp >> 6) & 0x3F);
+    utf8[3] = 0x80 | (cp & 0x3F);
+  }
+
+  return utf8;
+}