1// Copyright 2022 The Go Authors. All rights reserved.
 2// Use of this source code is governed by a BSD-style
 3// license that can be found in the LICENSE file.
 4
 5package cpu
 6
 7import "strconv"
 8
 9// parseRelease parses a dot-separated version number. It follows the semver
10// syntax, but allows the minor and patch versions to be elided.
11//
12// This is a copy of the Go runtime's parseRelease from
13// https://golang.org/cl/209597.
14func parseRelease(rel string) (major, minor, patch int, ok bool) {
15	// Strip anything after a dash or plus.
16	for i := range len(rel) {
17		if rel[i] == '-' || rel[i] == '+' {
18			rel = rel[:i]
19			break
20		}
21	}
22
23	next := func() (int, bool) {
24		for i := range len(rel) {
25			if rel[i] == '.' {
26				ver, err := strconv.Atoi(rel[:i])
27				rel = rel[i+1:]
28				return ver, err == nil
29			}
30		}
31		ver, err := strconv.Atoi(rel)
32		rel = ""
33		return ver, err == nil
34	}
35	if major, ok = next(); !ok || rel == "" {
36		return
37	}
38	if minor, ok = next(); !ok || rel == "" {
39		return
40	}
41	patch, ok = next()
42	return
43}