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use random IDs in notice instead of sequential ones

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This commit is contained in:
Connor Olding 2024-07-07 03:26:19 -07:00
parent 981c7fa04d
commit 42f2c5fc5f
1 changed files with 16 additions and 2 deletions
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18
sh/notice
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@ -59,9 +59,23 @@ __notice_urlencode2() {
done
} 2>&- # send bash's complaints to the abyss
__notice_generate_id() { # wraps around every 25 years
__notice_generate_id() {
: "${1:?missing seed}"
REPLY=""
unset REPLY
case "$1" in
# when "$(date -u +%s)" is the argument, this will last until 2096.
(*[!0-9]*) false;; (???????????*) false;; ([4-9]?????????) false;;
esac || return
# use REPLY as a temporary variable, since we'll overwrite it later anyway.
REPLY="$(( (2250438373 * $1 + 1) & 4294967295 ))" # shuffle IDs
# all this checking for negatives is due to mksh which overflows an i32.
REPLY="$(( (REPLY < 0 ? REPLY + 216313691 : REPLY) % 815730721 ))"
REPLY="$(( REPLY < 0 ? REPLY + 815730721 : REPLY ))"
set -- "$REPLY"
REPLY=
while [ "${#REPLY}" -lt 8 ]; do
case "$(($1%13))" in
(0) REPLY="${REPLY}a";; (1) REPLY="${REPLY}c";; (2) REPLY="${REPLY}e";;