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// Copyright 2015 Huan Du. All rights reserved.
// Licensed under the MIT license that can be found in the LICENSE file.

package xstrings

const bufferMaxInitGrowSize = 2048

// Lazy initialize a buffer.
func allocBuffer(orig, cur string) *stringBuilder {
	output := &stringBuilder{}
	maxSize := len(orig) * 4

	// Avoid to reserve too much memory at once.
	if maxSize > bufferMaxInitGrowSize {
		maxSize = bufferMaxInitGrowSize
	}

	output.Grow(maxSize)
	output.WriteString(orig[:len(orig)-len(cur)])
	return output
}