golang mapfile_read 代码
文件路径：/src/cmd/compile/internal/base/mapfile_read.go
/ Copyright 2018 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/go:build !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd
/ +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd
package base
import (
"io"
"os"
)
func MapFile(f *os.File, offset, length int64) (string, error) {
buf := make([]byte, length)
_, err := io.ReadFull(io.NewSectionReader(f, offset, length), buf)
if err != nil {
return "", err
}
return string(buf), nil
}