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Return length of 1 for continuation bytes #705

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Merged
Lysxia merged 1 commit into from
Aug 11, 2026
+4 −3
Merged

Return length of 1 for continuation bytes #705

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7 changes: 4 additions & 3 deletions src/Data/Text/Internal/Encoding/Utf8.hs
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Expand Up @@ -82,13 +82,14 @@ utf8Length :: Char -> Int
utf8Length (C# c) = I# ((1# +# geChar# c (chr# 0x80#)) +# (geChar# c (chr# 0x800#) +# geChar# c (chr# 0x10000#)))
{-# INLINE utf8Length #-}

-- | Measure byte length of UTF-8 encoding for characters,
-- starting with a given byte.
-- | Measure byte length of UTF-8 encoding for characters
-- starting with the given leading byte.
-- Continuation bytes yield a fail-safe value of 1.
--
-- @since 2.0
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utf8LengthByLeader :: Word8 -> Int
utf8LengthByLeader w
| w < 0x80 = 1
| w < 0xC0 = 1
| w < 0xE0 = 2
| w < 0xF0 = 3
| otherwise = 4
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