[issue1395] py3k: duplicated line endings when using read(1)

[Raghuram Devarakonda]

Raghuram Devarakonda added the comment:

I am attaching the patch io.diff that does the following:

- If a chunk ends in "\r", read the next chunk to check if it starts
with "\n". This is obviously a very simplified solution that can be
optimized.

- invoke _replacenl on the complete string read instead of what is being
returned in each read call.

I also incorporated the test case by Amaury and added one more.

With this patch in place, the following tests failed (on SuSE 10.1):

test_doctest test_mailbox test_nis test_old_mailbox
test_pickletools test_pty test_sys

The failures (other than known test_mailbox and test_old_mailbox) didn't
look like they are caused by this fix.

Added file: http://bugs.python.org/file8703/io.diff

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