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![]() The standard is somewhat unclear, but on the balance, I believe that the phrase “the rest of the input line” should be interpreted to mean the rest of the input line including the terminating newline if and only if there is one. This means the current implementation is incorrect on two points: - First, it suppresses the previous line's newline in the '1' case. - Second, it unconditionally emits a newline at the end of the output for non-empty input, even if the input did not end with a newline. Resolve this by rewriting the main loop. Instead of special-casing the first line and then assuming that every line ends with a newline, we remember how each line ends and emit that either at the beginning of the next line or at the end of the file except in the one case ('+') where the standard explicitly says not to. While here, try to reduce diff to upstream a little and update their RCS tag to reflect the fact that while we've diverged significantly from them, we've incorporated all their changes. Remove the useless second RCS tag. We also update the tests to account for the change in interpretation of the '1' case and add a test case for unterminated input. MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: kevans Differential Revision: https://reviews.freebsd.org/D43326 |
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