Silence CodeQL false positive warnings #4942
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* "Unclear validation of array index" silenced by `// lgtm [cpp/unclear-array-index-validation]` + `__msvc_string_view.hpp` 668: We have `bool _Matches[256]` and the index is cast to `unsigned char`. + `__msvc_string_view.hpp` 1334: `basic_string_view::operator[]` has optional validation controlled by `_CONTAINER_DEBUG_LEVEL` and intentionally doesn't validate by default. + `charconv`: `_Digit_from_byte` has 256 elements (enforced by `_STL_INTERNAL_STATIC_ASSERT`) and the index is cast to `unsigned char`. * "Cast from `char*` to `wchar_t*`" silenced by `// lgtm [cpp/incorrect-string-type-conversion]` + `xutility`: `_Copy_memmove()` is correctly bypassing pointer arithmetic for performance. + `StlLCMapStringA.cpp`: This function has [`LCMapStringA`][]'s narrow interface, but implements `LCMAP_SORTKEY` with wide [`LCMapStringEx`][]. "The sort key is stored in the buffer and treated as an opaque array of bytes" so there is no correctness issue. [`LCMapStringA`]: https://learn.microsoft.com/en-us/windows/win32/api/winnls/nf-winnls-lcmapstringa [`LCMapStringEx`]: https://learn.microsoft.com/en-us/windows/win32/api/winnls/nf-winnls-lcmapstringex
This looks like clear false positive that might be reported |
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We're trying to get in touch with the maintainers to report severe usability issues - if we get traction on those, then we can report specific false positives like these. |
CaseyCarter
approved these changes
Sep 8, 2024
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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// lgtm [cpp/unclear-array-index-validation]__msvc_string_view.hpp668: We havebool _Matches[256]and the index is cast tounsigned char.__msvc_string_view.hpp1334:basic_string_view::operator[]has optional validation controlled by_CONTAINER_DEBUG_LEVELand intentionally doesn't validate by default.charconv:_Digit_from_bytehas 256 elements (enforced by_STL_INTERNAL_STATIC_ASSERT) and the index is cast tounsigned char.char*towchar_t*" silenced by// lgtm [cpp/incorrect-string-type-conversion]xutility:_Copy_memmove()is correctly bypassing pointer arithmetic for performance.StlLCMapStringA.cpp: This function hasLCMapStringA's narrow interface, but implementsLCMAP_SORTKEYwith wideLCMapStringEx. "The sort key is stored in the buffer and treated as an opaque array of bytes" so there is no correctness issue.