add Sprintf and Sprintln

Signed-off-by: Jeff Carr <jcarr@wit.com>

original.go

@@ -61,6 +61,18 @@ func Printf(s string, a ...any) {
 	realPrintf(s, a...)
 }
 
+func Sprintf(s string, a ...any) string {
+	if ! PRINTLN.Ok() { return ""}
+	if ! PRINTLN.b { return ""}
+	return realSprintf(s, a...)
+}
+
+func Sprintln(s string, a ...any) string {
+	if ! PRINTLN.Ok() { return ""}
+	if ! PRINTLN.b { return ""}
+	return realSprintln(s, a...)
+}
+
 func Fatalln(a ...any) {
 	realFatalln(a...)
 }

reallog.go

@@ -36,6 +36,14 @@ func realPrintf(s string, a ...any) {
 	}
 }
 
+func realSprintf(s string, a ...any) string {
+	return fmt.Sprintf(s, a...)
+}
+
+func realSprintln(s string, a ...any) string {
+	return fmt.Sprintf(s, a...) + "\n"
+}
+
 func realFatalln(a ...any) {
 	reallog.Fatalln(a...)
 }