📄 ccard.h
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#ifndef CCARD_H#define CCARD_Henum ccard_type_ty{ ccard_type_unknown, ccard_type_mastercard, ccard_type_visa, ccard_type_amex, ccard_type_diners, ccard_type_discover, ccard_type_enroute, ccard_type_jcb, ccard_type_bankcard};typedef enum ccard_type_ty ccard_type_ty;enum ccard_error_ty{ ccard_error_none = 0, ccard_error_type_unknown, ccard_error_non_numeric, ccard_error_too_long, ccard_error_length_incorrect, ccard_error_checksum};typedef enum ccard_error_ty ccard_error_ty;char *ccard_type_name (ccard_type_ty);char *ccard_error_name (ccard_error_ty);ccard_error_ty ccard_valid (char *, ccard_type_ty *);#endif /* CCARD_H */
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