slog/util.go

// Copyright 2022 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.

package slog

// concat returns a new slice with the elements of s1 followed
// by those of s2. The slice has no additional capacity.
func concat[T any](s1, s2 []T) []T {
	s := make([]T, len(s1)+len(s2))
	copy(s, s1)
	copy(s[len(s1):], s2)
	return s
}

// Cheap integer to fixed-width decimal ASCII. Give a negative width to avoid zero-padding.
// Copied from log/log.go.
func itoa(buf *[]byte, i int, wid int) {
	// Assemble decimal in reverse order.
	var b [20]byte
	bp := len(b) - 1
	for i >= 10 || wid > 1 {
		wid--
		q := i / 10
		b[bp] = byte('0' + i - q*10)
		bp--
		i = q
	}
	// i < 10
	b[bp] = byte('0' + i)
	*buf = append(*buf, b[bp:]...)
}