buffer.go

package surveyexpect

import (
	"bytes"
	"sync"
)

// Buffer is a goroutine safe bytes.Buffer.
type Buffer struct {
	buffer bytes.Buffer
	mutex  sync.Mutex
}

// Write appends the contents of p to the buffer, growing the buffer as
// needed. The return value n is the length of p; err is always nil. If the
// buffer becomes too large, Write will panic with ErrTooLarge.
func (b *Buffer) Write(p []byte) (int, error) {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	return b.buffer.Write(p)
}

// String returns the contents of the unread portion of the buffer
// as a string. If the Buffer is a nil pointer, it returns "<nil>".
//
// To build strings more efficiently, see the strings.Builder type.
func (b *Buffer) String() string {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	return b.buffer.String()
}

// Reset resets the buffer to be empty,
// but it retains the underlying storage for use by future writes.
// Reset is the same as Truncate(0).
func (b *Buffer) Reset() {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	b.buffer.Reset()
}