func waitUntilCardPresent(ctx *scard.Context, reader string) error {
rs := []scard.ReaderState{{Reader: reader, CurrentState: scard.STATE_UNAWARE}}
for rs[0].EventState&scard.STATE_PRESENT == 0 {
err := ctx.GetStatusChange(rs, scard.INFINITE)
if err != nil {
return err
}
}
return nil
}
func waitUntilCardPresent(ctx *scard.Context, readers []string) (int, error) {
rs := make([]scard.ReaderState, len(readers))
for i := range rs {
rs[i].Reader = readers[i]
rs[i].CurrentState = scard.STATE_UNAWARE
}
for {
for i := range rs {
if rs[i].EventState&scard.STATE_PRESENT != 0 {
return i, nil
}
}
err := ctx.GetStatusChange(rs, scard.INFINITE)
if err != nil {
return -1, err
}
}
panic("unreachable")
}