Windows, test wrapper: simplify IFStream

Simplify IFStream:
- Get() now returns the byte under the cursor and
  moves forward.
- Peek() can peek any characters and returns the
  number peeked.
- Advance() and PeekN() is removed.

The benefit:
- Telling if we reached EOF is easy: Advance()
  used to return false on I/O error and EOF and we
  couldn't tell them apart.
- The semantics lend themselves easier for UTF-8
  stream escaping.

See https://github.com/bazelbuild/bazel/issues/5508

Closes #7528.

PiperOrigin-RevId: 235677987
3 files changed
tree: 40ac73b0fa58b0d2e4737b0c0507201c843263be
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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