tailscale/util/lineread/lineread.go
Will Norris 71029cea2d all: update copyright and license headers
This updates all source files to use a new standard header for copyright
and license declaration.  Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.

This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.

Updates #6865

Signed-off-by: Will Norris <will@tailscale.com>
2023-01-27 15:36:29 -08:00

38 lines
963 B
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// Package lineread reads lines from files. It's not fancy, but it got repetitive.
package lineread
import (
"bufio"
"io"
"os"
)
// File opens name and calls fn for each line. It returns an error if the Open failed
// or once fn returns an error.
func File(name string, fn func(line []byte) error) error {
f, err := os.Open(name)
if err != nil {
return err
}
defer f.Close()
return Reader(f, fn)
}
// Reader calls fn for each line.
// If fn returns an error, Reader stops reading and returns that error.
// Reader may also return errors encountered reading and parsing from r.
// To stop reading early, use a sentinel "stop" error value and ignore
// it when returned from Reader.
func Reader(r io.Reader, fn func(line []byte) error) error {
bs := bufio.NewScanner(r)
for bs.Scan() {
if err := fn(bs.Bytes()); err != nil {
return err
}
}
return bs.Err()
}