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#ifndef _BUF_H_

#define _BUF_H_

#include <stdint.h>

/* Maximum length of buffer. */

#define MAXBUFLEN 200

/* Per device data buffer. */

struct buf {

        uint8_t data[MAXBUFLEN]; /* The data buffer to be used. */

        uint16_t off_read;       /* The current read pointer in the buffer. */

        uint16_t off_write;      /* The current write pointer in the buffer. */

        /* These shall be able to store numbers > MAXBUFLEN. */

        uint16_t wcount;

        uint16_t rcount;

#define BUF_STATUS_FULL         0x1

#define BUF_STATUS_EMPTY        0x2

/*

 * For users of buf, note that the status flags will be set when the condition

 * is discovered, which means it will signal an empty buffer after the last call

 * filling it up.

 */

        int8_t status;           /* The status of the buffer. */

};

#define BUF_FULL(b) ((b)->status & BUF_STATUS_FULL)

#define BUF_EMPTY(b) ((b)->status & BUF_STATUS_EMPTY)

void     buf_init(struct buf *);

uint16_t buf_readsleft(struct buf *);

uint16_t buf_writesleft(struct buf *);

int8_t   buf_write(struct buf *, uint8_t *, uint8_t);

int8_t   buf_read(struct buf *, uint8_t *, uint8_t);

#endif /* !_BUF_H_ */