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Unify locale helpers with `if constexpr`#5923

Merged

StephanTLavavej merged 15 commits intomicrosoft:mainfrom

StephanTLavavej:unify-locale-helpers

Dec 1, 2025

Commits on Dec 1, 2025

Drop `__CRTDECL` on internal header-only functions.
StephanTLavavej
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Unify with `if constexpr`, part 1: `_LStrcoll()`
StephanTLavavej
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Unify with `if constexpr`, part 2: `_LStrxfrm()`
StephanTLavavej
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Unify with `if constexpr`, part 3: `_Maklocbyte`, `_Maklocchr`, `_Maklocstr`
StephanTLavavej
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Fix bogus SAL annotations on `_Strxfrm()`, `_Wcsxfrm()`, and `_LStrxfrm()`, following GH 5444.
StephanTLavavej
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Fix comment: `_XStrxfrm` (no such thing) => `_LStrxfrm`
StephanTLavavej
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`_Maklocbyte`, `_Maklocchr`, `_Maklocstr`: Guard `unsigned short` with `#ifdef _CRTBLD`.
StephanTLavavej
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Pass an explicit template arg to `_Maklocchr` and `_Maklocstr` instead of a typed null pointer.
StephanTLavavej
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Unify `wchar_t` and `unsigned short`, part 1: Prepare `_Maklocstr`
StephanTLavavej
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Unify `wchar_t` and `unsigned short`, part 2: Prepare `_Maklocbyte`, `_Maklocchr`
StephanTLavavej
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Unify `wchar_t` and `unsigned short`, part 3: Extract `_Is_wchar_or_crtbld_ushort`.
StephanTLavavej
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`_Maklocstr`: Remove dead `_Count -= _Bytes`.
StephanTLavavej
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`_Maklocstr`: Improve variable scoping, part 1.
StephanTLavavej
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`_Maklocstr`: Improve variable scoping, part 2.
StephanTLavavej
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Guard `locale::_Locimp::_Makeushloc()` with `#ifdef _CRTBLD`.
StephanTLavavej
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