forgejo/modules/util/io.go

// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package util

import (
	"io"
)

// ReadAtMost reads at most len(buf) bytes from r into buf.
// It returns the number of bytes copied. n is only less than len(buf) if r provides fewer bytes.
// If EOF occurs while reading, err will be nil.
func ReadAtMost(r io.Reader, buf []byte) (n int, err error) {
	n, err = io.ReadFull(r, buf)
	if err == io.EOF || err == io.ErrUnexpectedEOF {
		err = nil
	}
	return n, err
}