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#!/bin/bash
# Script author: Joseph Steinhauser
# Lightly edited by ABS Guide author, but not commented.
# Used in ABS Guide with permission.
#-------------------------------------------------------------------------
#-- File: ascii.sh Print ASCII chart, base 10/8/16 (JETS-2012)
#-------------------------------------------------------------------------
#-- Usage: ascii [oct|dec|hex|help|8|10|16]
#--
#-- This script prints out a summary of ASCII char codes from Zero to 127.
#-- Numeric values may be printed in Base10, Octal, or Hex.
#--
#-- Format Based on: /usr/share/lib/pub/ascii with base-10 as default.
#-- For more detail, man ascii . . .
#-------------------------------------------------------------------------
[ -n "$BASH_VERSION" ] && shopt -s extglob
case "$1" in
oct|[Oo]?([Cc][Tt])|8) Obase=Octal; Numy=3o;;
hex|[Hh]?([Ee][Xx])|16|[Xx]) Obase=Hex; Numy=2X;;
help|?(-)[h?]) sed -n '2,/^[ ]*$/p' $0;exit;;
code|[Cc][Oo][Dd][Ee])sed -n '/case/,$p' $0;exit;;
*) Obase=Decimal
esac # CODE is actually shorter than the chart!
printf "\t\t## $Obase ASCII Chart ##\n\n"; FM1="|%0${Numy:-3d}"; LD=-1
AB="nul soh stx etx eot enq ack bel bs tab nl vt np cr so si dle"
AD="dc1 dc2 dc3 dc4 nak syn etb can em sub esc fs gs rs us sp"
for TOK in $AB $AD; do ABR[$((LD+=1))]=$TOK; done;
ABR[127]=del
IDX=0
while [ $IDX -le 127 ] && CHR="${ABR[$IDX]}"
do ((${#CHR}))&& FM2='%-3s'|| FM2=`printf '\\\\%o ' $IDX`
printf "$FM1 $FM2" "$IDX" $CHR; (( (IDX+=1)%8))||echo '|'
done
exit $?
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