验证浮点数输入

浮点数输入在整数验证的基础上，将小数通过小数点分割成两部分，进行验证。

• . validint 通过小数点加对应的shell 文件引入对应的shell文件

#!/bin/bash

. 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

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