1 files changed, 34 insertions, 0 deletions
diff --git a/libgo/go/runtime/string.go b/libgo/go/runtime/string.go
index 741b6b4..df4cae7 100644
--- a/libgo/go/runtime/string.go
+++ b/libgo/go/runtime/string.go
@@ -508,3 +508,37 @@ func __go_byte_array_to_string(p unsafe.Pointer, l int) string {
 func __go_string_to_byte_array(s string) []byte {
 	return stringtoslicebyte(nil, s)
 }
+
+// parseRelease parses a dot-separated version number. It follows the
+// semver syntax, but allows the minor and patch versions to be
+// elided.
+func parseRelease(rel string) (major, minor, patch int, ok bool) {
+	// Strip anything after a dash or plus.
+	for i := 0; i < len(rel); i++ {
+		if rel[i] == '-' || rel[i] == '+' {
+			rel = rel[:i]
+			break
+		}
+	}
+
+	next := func() (int, bool) {
+		for i := 0; i < len(rel); i++ {
+			if rel[i] == '.' {
+				ver, ok := atoi(rel[:i])
+				rel = rel[i+1:]
+				return ver, ok
+			}
+		}
+		ver, ok := atoi(rel)
+		rel = ""
+		return ver, ok
+	}
+	if major, ok = next(); !ok || rel == "" {
+		return
+	}
+	if minor, ok = next(); !ok || rel == "" {
+		return
+	}
+	patch, ok = next()
+	return
+}