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base.sh: support randoms in shells with 32-bit math

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bol-van 2024-12-20 16:57:27 +03:00
parent c6058a4ea9
commit a02be13dd1
1 changed files with 10 additions and 1 deletions
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11
common/base.sh
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@ -318,18 +318,27 @@ setup_md5()
exists $MD5 || MD5=md5
}
setup_random()
{
[ -n "$RCUT" ] && return
RCUT="cut -c 1-17"
# some shells can operate with 32 bit signed int
[ $((0x100000000)) = 0 ] && RCUT="cut -c 1-9"
}
random()
{
# $1 - min, $2 - max
local r rs
setup_md5
setup_random
if [ -c /dev/urandom ]; then
read rs </dev/urandom
else
rs="$RANDOM$RANDOM$(date)"
fi
# shells use signed int64
r=1$(echo $rs | $MD5 | sed 's/[^0-9]//g' | cut -c 1-17)
r=1$(echo $rs | $MD5 | sed 's/[^0-9]//g' | $RCUT)
echo $(( ($r % ($2-$1+1)) + $1 ))
}