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Kernel: Add KLexicalPath::try_join and use it

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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.
This commit is contained in:
Max Wipfli 2021-07-06 12:05:50 +02:00 • committed by Andreas Kling
parent ee342f5ec3
commit 1f792faf34
3 changed files with 35 additions and 1 deletions
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28
Kernel/KLexicalPath.cpp
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@ -55,4 +55,32 @@ Vector<StringView> parts(StringView const& path)
return path.split_view('/');
}
OwnPtr<KString> try_join(StringView const& first, StringView const& second)
{
VERIFY(is_canonical(first));
VERIFY(is_canonical(second));
VERIFY(!is_absolute(second));
if (first == "/"sv) {
char* buffer;
auto string = KString::try_create_uninitialized(1 + second.length(), buffer);
if (!string)
return {};
buffer[0] = '/';
__builtin_memcpy(buffer + 1, second.characters_without_null_termination(), second.length());
buffer[string->length()] = 0;
return string;
} else {
char* buffer;
auto string = KString::try_create_uninitialized(first.length() + 1 + second.length(), buffer);
if (!string)
return string;
__builtin_memcpy(buffer, first.characters_without_null_termination(), first.length());
buffer[first.length()] = '/';
__builtin_memcpy(buffer + first.length() + 1, second.characters_without_null_termination(), second.length());
buffer[string->length()] = 0;
return string;
}
}
}