Eryk Sun <eryk...@gmail.com> added the comment: > "lowercase two strings by means of LCMapStringEx() and then wcscmp > the two" always gives the same result as "compare the two strings > with CompareStringOrdinal()"
For checking case-insensitive equality, it shouldn't matter whether names are converted to uppercase or lowercase when using invariant non-linguistic casing. It's based on symmetric mappings between pairs of uppercase and lowercase codes, which avoids problems such as 'ϴ' (U+03F4) and 'Θ' (U+0398) both lowercasing as 'θ' (U+03B8), or 'ß' uppercasing as 'SS'. That said, when sorting filenames, you need to use LCMAP_UPPERCASE in order to match the case-insensitive sort order of Windows. For example, 'Ÿ' (U+0178) is greater than 'Ŷ' (U+0176), but -- respectively lowercase -- 'ÿ' (U+00FF) is less than 'ŷ' (U+0177). In particular, if you have an NTFS directory with two files named 'ÿ' and 'ŷ', the listing will be ['ŷ', 'ÿ'] -- in uppercase order. (An NTFS directory is stored on disk as a b-tree sorted by uppercase filenames.) For the implementation, _winapi.LCMapStringEx and related constants could be added. ---------- nosy: +eryksun _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42658> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
