Move the "--size @FILE" file size reading into its own function for clarity; standardise its error message format to "program: file: message: detail"; uniquely name variables; refuse to accept a directory as a file; and with this option, try reading the size of a block device from sysfs if we can, to avoid requiring read permissions on the device.
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### UNRELEASED
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* feature: when using "`--size @FILE`", _FILE_ can be a block device, and its size will be used (pull request [#94](https://codeberg.org/a-j-wood/pv/pulls/94)) supplied by [alexanderperlis](https://codeberg.org/alexanderperlis)
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### 1.8.12 - 18 July 2024
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* fix: correct the detection of output block device size that was broken in 1.8.10 ([#91](https://codeberg.org/a-j-wood/pv/issues/91))
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