[libc-commits] [libc] [libc] Add getc, ungetc, fflush to enable libc++ iostream on baremetal (PR #175530)

[Petr Hosek via libc-commits]

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@@ -32,11 +32,31 @@ struct FileIOResult {
   constexpr operator size_t() { return value; }
 };
 
+// ungetc handling.
+int store_ungetc_value(::FILE *stream, int c);
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petrhosek wrote:

Maybe this could be call `push_ungetc_value` to be symmetric with `pop_ungetc_value`?

https://github.com/llvm/llvm-project/pull/175530