Collin Funk 30a5cbec0e tac: promptly diagnose write errors ...

This patch also fixes a bug where 'tac' would print a vague error on
some inputs:

    $ seq 10000 | ./src/tac-prev > /dev/full
    tac-prev: write error
    $ seq 10000 | ./src/tac > /dev/full
    tac: write error: No space left on device

In this case ferror (stdout) is true, but errno has been set back to
zero by a successful fclose (stdout) call.

* src/tac.c (output): Call write_error() if fwrite fails.
* tests/misc/io-errors.sh: Check that 'tac' prints a detailed write
error.
* NEWS: Mention the improvement.

2026-03-21 12:10:59 -07:00

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