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

[Volodymyr Turanskyy via libc-commits]

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@@ -32,11 +32,34 @@ struct FileIOResult {
   constexpr operator size_t() { return value; }
 };
 
+// ungetc handling.
+int push_ungetc_value(::FILE *stream, int c);
+bool pop_ungetc_value(::FILE *stream, unsigned char &out);
+LIBC_INLINE int ungetc_internal(int c, ::FILE *stream) {
+  return push_ungetc_value(stream, c);
+}
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voltur01 wrote:

Indeed, updated - thank you for the reviews and support in bringing this to conclusion!

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