Add include guards to header files

1 files changed, 5 insertions, 0 deletions

diff --git a/utf8.h b/utf8.h
index 4acf955..8ec5f3e 100644
--- a/utf8.h
+++ b/utf8.h
@@ -1,3 +1,6 @@
+#ifndef UTF8_H
+#define UTF8_H
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
@@ -5,3 +8,5 @@
 size_t codepoint_to_utf8(const uint32_t codepoint, unsigned char buffer[4]);
 bool utf8_to_codepoint(const unsigned char buffer[4], const size_t len,
                        uint32_t *codepoint);
+
+#endif /* UTF8_H */