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https://github.com/moparisthebest/pacman
synced 2024-12-23 08:18:51 -05:00
b58489d29a
This is a bash wrapper around an awk function that parses human readable sizes and returns their representative values in bytes, as a string. A small test harness is added to validate the functionality. Signed-off-by: Dave Reisner <dreisner@archlinux.org>
52 lines
1.1 KiB
Bash
52 lines
1.1 KiB
Bash
human_to_size() {
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awk -v human="$1" '
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function trim(s) {
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gsub(/^[[:space:]]+|[[:space:]]+$/, "", s)
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return s
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}
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function parse_units(units) {
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if (!units || units == "B")
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return 1
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if (match(units, /^.iB$/))
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return 1024
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if (match(units, /^.B$/))
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return 1000
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if (length(units) == 1)
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return 1024
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# parse failure: invalid base
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return -1
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}
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function parse_scale(s) {
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return index("BKMGTPE", s) - 1
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}
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function isnumeric(string) {
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return match(string, /^[-+]?[[:digit:]]*(\.[[:digit:]]*)?/)
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}
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BEGIN {
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# peel off the leading number as the size, fail on invalid number
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human = trim(human)
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if (isnumeric(human))
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size = substr(human, RSTART, RLENGTH)
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else
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exit 1
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# the trimmed remainder is assumed to be the units
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units = trim(substr(human, RLENGTH + 1))
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base = parse_units(units)
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if (base < 0)
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exit 1
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scale = parse_scale(substr(units, 1, 1))
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if (scale < 0)
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exit 1
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printf "%d\n", size * base^scale + (size + 0 > 0 ? 0.5 : -0.5)
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}'
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}
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