/
meg.go
82 lines (70 loc) · 1.87 KB
/
meg.go
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// Copyright 2019-current Go-dump Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dump
import (
"fmt"
"math"
)
// meg prints out a number in human readable form, e.g. 20B, 20KB, 20MB, 20GB.
// Returns "NaN" if the input is not a number (int, float).
// Note these values are MB, not MiB.
func meg(n interface{}) string {
const (
kilo float64 = 1000.0
mega float64 = 1000.0 * kilo
giga float64 = 1000.0 * mega
tera float64 = 1000.0 * giga
)
megInt64 := func(x float64) string {
xAbs := math.Abs(x)
switch {
case xAbs > tera:
return fmt.Sprintf("%.2fT", x/tera)
case xAbs > giga:
return fmt.Sprintf("%.2fG", x/giga)
case xAbs > mega:
return fmt.Sprintf("%.2fM", x/mega)
case xAbs > kilo:
return fmt.Sprintf("%.2fK", x/kilo)
default:
return fmt.Sprintf("%d", int(x))
}
}
// in the order of likelihood
switch t := n.(type) {
case uint64:
return megInt64(float64(t))
case int64:
return megInt64(float64(t))
case int:
return megInt64(float64(t))
case float64:
return megInt64(float64(t))
case float32:
return megInt64(float64(t))
case int32:
return megInt64(float64(t))
case uint32:
return megInt64(float64(t))
case int16:
return megInt64(float64(t))
case uint16:
return megInt64(float64(t))
case int8:
return megInt64(float64(t))
case uint8: // also byte
return megInt64(float64(t))
default:
return "NaN"
}
}