[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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petrhosek wrote:

Does this needs its own `.h.` and `.cpp`? Could this live in `file_internal.h` and `file_internal.cpp`?

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