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authorRich Felker <dalias@aerifal.cx>2014-09-05 03:28:00 -0400
committerRich Felker <dalias@aerifal.cx>2014-09-05 03:28:00 -0400
commit4674809bdf7a46041ac0152eea0a6363ceeca548 (patch)
tree4e8460ef71d49a36c912bed355bc4e7ed7b0bf41 /include/math.h
parentfff546930347d99729f1c0a9d911e7f24a094531 (diff)
downloadmusl-4674809bdf7a46041ac0152eea0a6363ceeca548.tar.gz
fix case mapping for U+00DF (ß)
U+00DF ('ß') has had an uppercase form (U+1E9E) available since Unicode 5.1, but Unicode lacks the case mappings for it due to stability policy. when I added support for the new character in commit 1a63a9fc30e7a1f1239e3cedcb5041e5ec1c5351, I omitted the mapping in the lowercase-to-uppercase direction. this choice was not based on any actual information, only assumptions. this commit adds bidirectional case mappings between U+00DF and U+1E9E, and removes the special-case hack that allowed U+00DF to be identified as lowecase despite lacking a mapping. aside from strong evidence that this is the "right" behavior for real-world usage of these characters, several factors informed this decision: - the other "potentially correct" mapping, to "SS", is not representable in the C case-mapping system anyway. - leaving one letter in lowercase form when transforming a string to uppercase is obviously wrong. - having a character which is nominally lowercase but which is fixed under case mapping violates reasonable invariants.
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