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Preparation for using Error.h from Vector.h. This required moving some
things out of line.
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We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace!
This was a slightly tedious refactoring that took a long time, so it's
not unlikely that some bugs crept in.
Nevertheless, it does pass basic functionality testing, and it's just
real nice to finally see the same pattern in all contexts. :^)
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There are a number of places that don't have an error propagation path
right now, so I've added FIXME's about that.
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This removes some assertions from KLexicalPath::basename() by supporting
paths with trailing slashes, empty paths, paths consisting of only
slashes and paths with ending "." and ".." segments.
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This adds KLexicalPath::try_join(). As this cannot be done without
allocation, it uses KString and can fail. This patch also uses it at one
place. All the other cases of String::formatted("{}/{}", ...) currently
rely on the return value being a String, which means they cannot easily
be converted to use the new API.
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This adds KLexicalPath, which are a few static functions which aim to
mostly emulate AK::LexicalPath. They are however constrained to work
with absolute paths only, containing no '.' or '..' path segments and no
consecutive slashes. This way, it is possible to avoid use StringView
for the return values and thus avoid allocating new String objects.
As explained above, the functions are currently very strict about the
allowed input paths. This seems to not be a problem currently. Since the
functions VERIFY this, potential bugs caused by this will become
immediately obvious.
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