commit 8b6e653ae17f275ccee3566d7c955ec29ebf1398 parent 901435f1d25f3a6773eeddcd53de3e215fd891c8 Author: Alex Balgavy <a.balgavy@gmail.com> Date: Tue, 10 Nov 2020 11:12:39 +0100 base: simple base conversion script using POSIX bc Former-commit-id: 59e3261c36ac50f5a40a5f70e0c627b7f037de16 Diffstat:
| A | scripts/base | | | 65 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 65 insertions(+), 0 deletions(-)
diff --git a/scripts/base b/scripts/base @@ -0,0 +1,65 @@ +#!/bin/sh +command -v bc >/dev/null 2>&1 || { printf "bc not installed.\n" && exit 1; } + +usage() { + printf "Usage: %s [options] num" "$0" +} +[ $# -ge 1 ] || { usage && exit 1; } + +PARAMS="" + +while [ $(($#)) -ne 0 ]; do + case "$1" in + -x|--hex) + obase=16 + shift + ;; + -d|--decimal) + obase=10 + shift + ;; + -o|--octal) + obase=8 + shift + ;; + -b|--binary) + obase=2 + shift + ;; + -h|--help) + usage + exit 0 + ;; + --) # end arg parsing + shift + break + ;; + -*) # unsupported flags + echo "Unsupported flag $1" >&2 + exit 1 + ;; + *) # preserve positional arguments + PARAMS="$PARAMS $1" + shift + ;; + esac +done +eval set -- "$PARAMS" + +case "$1" in + 0x*) ibase=16; val="$(printf "%s" "${1#0x}" | tr '[:lower:]' '[:upper:]')";; + 0d*) ibase=10; val="${1#0d}";; + 0o*) ibase=8; val="${1#0o}";; + 0b*) ibase=2; val="${1#0b}";; + *) ibase=10; val="$1";; +esac + +if [ -n "$obase" ]; then + printf "obase=%s; ibase=%s; %s\n" "$obase" "$ibase" "$val" | bc -w | tr -d '\n' +else + printf "Dec: %s\n" "$(printf "obase=10; ibase=%s; %s\n" "$ibase" "$val" | bc -w)" \ + && printf "Hex: %s\n" "$(printf "obase=16; ibase=%s; %s\n" "$ibase" "$val" | bc -w)" \ + && printf "Oct: %s\n" "$(printf "obase=8; ibase=%s; %s\n" "$ibase" "$val" | bc -w)" \ + && printf "Bin: %s\n" "$(printf "obase=2; ibase=%s; %s\n" "$ibase" "$val" | bc -w)" +fi +