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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.

//

// 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 errors

import (

"runtime"

"github.com/pkg/errors"

)

type stack []uintptr

// callers returns the call stack, skipping the first frames.

func callers(skip int) *stack {

const depth = 32

var pcs [depth]uintptr

n := runtime.Callers(skip, pcs[:])

var st stack = pcs[0:n]

return &st

}

// StackTrace implements the errors.stackTracer interface.

func (s *stack) StackTrace() errors.StackTrace {

if s == nil {

return nil

}

f := make([]errors.Frame, len(*s))

for i := 0; i < len(f); i++ {

f[i] = errors.Frame((*s)[i])

}

return f

}