scripts/validfloat at main · ji-junhyuk/scripts · GitHub

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#!/bin/bash

# validfloat 숫자가 유효한 부동 소수점 값인지 테스트한다.
# 지수 표기법 허용하지 않는다.

. validint

validfloat()
{
	fvalue="$1"

	if [ ! -z $(echo $fvalue | sed 's/[^.]//g') ] ; then
		decimalPart="$(echo $fvalue | cut -d. -f1)"
		fractionalPart="${fvalue#*\.}"
		if [ ! -z $decimalPart ] ; then
			if ! validint "$decimalPart" "" "" ; then
				return 1
			fi
		fi
		if [ "${fractionalPart%${fractionalPart#?}}" = "-" ] ; then
			echo "Invalid floating-point number: '-' not allowed after decimal point." >&2
			return 1
		fi
		if [ "$fractionalPart" != "" ] ; then
			if ! validint "$fractionalPart" "0" "" ; then
				return 1
			fi
		fi
	else
		if [ "$fvalue" = "-" ] ; then
			echo "Invalid floating-point format." >&2
			return 1
		fi
		if ! validint "$fvalue" "" "" ; then
			return 1
		fi
	fi
	return 0
}

if validfloat $1 ; then
	echo "$1 is a valid floating-point value."
fi
exit 0