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-rw-r--r--scripts/library/human_to_size.sh51
1 files changed, 51 insertions, 0 deletions
diff --git a/scripts/library/human_to_size.sh b/scripts/library/human_to_size.sh
new file mode 100644
index 00000000..11613207
--- /dev/null
+++ b/scripts/library/human_to_size.sh
@@ -0,0 +1,51 @@
+human_to_size() {
+ awk -v human="$1" '
+ function trim(s) {
+ gsub(/^[[:space:]]+|[[:space:]]+$/, "", s)
+ return s
+ }
+
+ function parse_units(units) {
+ if (!units || units == "B")
+ return 1
+ if (match(units, /^.iB$/))
+ return 1024
+ if (match(units, /^.B$/))
+ return 1000
+ if (length(units) == 1)
+ return 1024
+
+ # parse failure: invalid base
+ return -1
+ }
+
+ function parse_scale(s) {
+ return index("BKMGTPE", s) - 1
+ }
+
+ function isnumeric(string) {
+ return match(string, /^[-+]?[[:digit:]]*(\.[[:digit:]]*)?/)
+ }
+
+ BEGIN {
+ # peel off the leading number as the size, fail on invalid number
+ human = trim(human)
+ if (isnumeric(human))
+ size = substr(human, RSTART, RLENGTH)
+ else
+ exit 1
+
+ # the trimmed remainder is assumed to be the units
+ units = trim(substr(human, RLENGTH + 1))
+
+ base = parse_units(units)
+ if (base < 0)
+ exit 1
+
+ scale = parse_scale(substr(units, 1, 1))
+ if (scale < 0)
+ exit 1
+
+ printf "%d\n", size * base^scale + (size + 0 > 0 ? 0.5 : -0.5)
+ }'
+}