[libc-commits] [libc] [libc] fix -Wtype-limits in wctob (PR #74511)

[Schrodinger ZHU Yifan via libc-commits]

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@@ -28,10 +28,14 @@ namespace internal {
 LIBC_INLINE cpp::optional<int> wctob(wint_t c) {
   // This needs to be translated to EOF at the callsite. This is to avoid
   // including stdio.h in this file.
-  // The standard states that wint_t may either be an alias of wchar_t or
-  // an alias of an integer type, so we need to keep the c < 0 check.
-  if (c > 127 || c < 0)
+  if (c > 127)
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SchrodingerZhu wrote:

![image](https://github.com/llvm/llvm-project/assets/20108837/4f593a01-b5e3-4c7d-9d17-3059374bee4b)


https://github.com/llvm/llvm-project/pull/74511