utf8: use unsigned int in decoder.

* utf8.h (utf8_decoder_t): Declare the flags member as well
as the buffer indices head, tail and back as unsigned.
Bitmask fields holding flags should be unsigned.
Regarding the indices, we perform % 8 reductions on them in
the decoder, which optimizes much better for unsigned types.

1 files changed, 2 insertions, 2 deletions

diff --git a/utf8.h b/utf8.h
index d0182e97..3300cfbd 100644
--- a/utf8.h
+++ b/utf8.h
@@ -41,9 +41,9 @@ enum utf8_state { utf8_init, utf8_more1, utf8_more2, utf8_more3 };
 
 typedef struct utf8_decoder {
   enum utf8_state state;
-  int flags;
+  unsigned flags;
   wchar_t wch, wch_min;
-  int head, tail, back;
+  unsigned head, tail, back;
   int buf[8];
 } utf8_decoder_t;