src: improve get_card_readers logic

santigimeno / node-pcsclite

Bindings over pcsclite to access Smart Cards

ISC License

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Closed santigimeno closed 8 years ago

santigimeno commented 8 years ago

Use SCARD_AUTOALLOCATE if available. It avoids one extra call to SCardListReaders.
If it's not available handle SCARD_E_INSUFFICIENT_BUFFER error by retrying get_card_readers.