tree 40ac73b0fa58b0d2e4737b0c0507201c843263be
parent 8de8f924d747005dec6f6e8c577a726a21eef0ab
author Laszlo Csomor <laszlocsomor@google.com> 1551172748 -0800
committer Copybara-Service <copybara-worker@google.com> 1551172824 -0800

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