RFR: 8261949: fileStream::readln returns incorrect line string

[David Holmes]

On Thu, 18 Feb 2021 12:31:29 GMT, Yang Yi <github.com+5010047+kelthuzadx at openjdk.org> wrote:

> When the last line does not contain a NEWLINE character, fileStream::readln would read
> truncated line string:
> 
> $ cat file_content:
> AA
> BB
> CC<EOF>
> 
> fileStream::readln result:
> "AA"
> "BB"
> "C"
> 
> This patch address this problem, it works for Posix and Windows since the last character
> of these systems is always '\n'.

Changes requested by dholmes (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2626