fix str::eq_slice off-by-one error #3364
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ghost
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First pull request, realized I didn't rebase onto incoming. Redoing this before submitting again. |
jaisnan
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Jul 29, 2024
Resolves rust-lang#3358 Related upstream commits: - rust-lang@21dc49c587 ptr::metadata: avoid references to extern types
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The new
memcmp-based implementation ofstr::eq_slice(54a8d69) usesstr::as_buf, which, according to its documentation, passes one more than the real length of the string in order to facilitate null-terminator checks.eq_slicedoesn't take this into account, and compares the next byte beyond the ends of the slices it is given. For full strings, this is the null terminator, but for slices in the middle of a string, this is whatever the next UTF-8 byte is.Therefore, code like
assert str::view("foobar", 0, 3) == "foo";fails.This fix simply subtracts one from the length yielded by
as_bufin order to compensate for this.