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Added function mask2cidr in .zshrc

This commit is contained in:
Marcin Woźniak 2024-01-22 00:19:18 +01:00
parent 329ab8e7f9
commit 0de572feaf
Signed by: y0rune
GPG Key ID: F204C385F57EB348
1 changed files with 18 additions and 0 deletions
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18
.zshrc
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@ -16,6 +16,24 @@ gbranch() {
echo -e "$(git branch "$@")"
}
mask2cidr() {
local mask=$1
# In RFC 4632 netmasks there's no "255." after a non-255 byte in the mask
local left_stripped_mask=${mask##*255.}
local len_mask=${#mask}
local len_left_stripped_mask=${#left_stripped_mask}
local conversion_table=0^^^128^192^224^240^248^252^254^
local number_of_bits_stripped=$((($len_mask - $len_left_stripped_mask) * 2))
local signifacant_octet=${left_stripped_mask%%.*}
local right_stripped_conversion_table=${conversion_table%%$signifacant_octet*}
local len_right_stripped_conversion_table=${#right_stripped_conversion_table}
local number_of_bits_from_conversion_table=$((len_right_stripped_conversion_table / 4))
echo $(($number_of_bits_stripped + $number_of_bits_from_conversion_table))
}
[ -f /etc/gentoo-release ] && export ZSH="/usr/share/zsh/site-contrib/oh-my-zsh"
[ -f /etc/centos-release ] && export ZSH="$HOME/.oh-my-zsh"
[ -f /etc/debian_version ] && export ZSH="$HOME/.oh-my-zsh"