vendor/github.com/karalabe/gousb/usb/debug.go


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// Copyright 2013 Google Inc.  All rights reserved.
//
// 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 usb

// To enable internal debugging:
//   -ldflags "-X github.com/karalabe/gousb/usb.debugInternal true"

import (
    "io"
    "io/ioutil"
    "log" // TODO(kevlar): make a logger
    "os"
)

var debug *log.Logger
var debugInternal string

func init() {
    var out io.Writer = ioutil.Discard
    if debugInternal != "" {
        out = os.Stderr
    }
    debug = log.New(out, "usb", log.LstdFlags|log.Lshortfile)
}