fixing illegal chars (just in case), copied from go-junit-report

cmd/go2junit/escape.go

@@ -0,0 +1,25 @@
+package main
+
+import "strings"
+
+// copied from go-junit-report for fixing issues with chars that
+// are out of range.
+
+// from encoding/xml/xml.go, replace chars by unknown char
+func isInCharacterRange(r rune) (inrange bool) {
+	return r == 0x09 ||
+		r == 0x0A ||
+		r == 0x0D ||
+		r >= 0x20 && r <= 0xD7FF ||
+		r >= 0xE000 && r <= 0xFFFD ||
+		r >= 0x10000 && r <= 0x10FFFF
+}
+
+func escapeIllegalChars(str string) string {
+	return strings.Map(func(r rune) rune {
+		if isInCharacterRange(r) {
+			return r
+		}
+		return '\uFFFD'
+	}, str)
+}