[all-commits] [llvm/llvm-project] 455ef3: [libc++] Fix ungetc failing after xsgetn (#210951)

[Nikolas Klauser via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 455ef3684fae3273b3423bb0229e33584745c6cc
      https://github.com/llvm/llvm-project/commit/455ef3684fae3273b3423bb0229e33584745c6cc
  Author: Nikolas Klauser <nikolasklauser at berlin.de>
  Date:   2026-07-28 (Tue, 28 Jul 2026)

  Changed paths:
    M libcxx/include/fstream
    M libcxx/src/ios.instantiations.cpp
    A libcxx/test/extensions/libcxx/input.output/file.streams/fstreams/filebuf.members/test.dat
    A libcxx/test/extensions/libcxx/input.output/file.streams/fstreams/filebuf.members/xsgetn.buffer.pass.cpp
    M libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/xsgetn.pass.cpp

  Log Message:
  -----------
  [libc++] Fix ungetc failing after xsgetn (#210951)

After #206453 we don't correctly handle `unget()` anymore. This fixes
the issue by updating the internal buffer to contain the tail of the
read data.

Fixes #210203



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