driver.h

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#ifndef _SYS_DRIVER_H
#define _SYS_DRIVER_H
 
typedef struct __driver _Driver;
 
struct __driver {
  const char *prefix;
 
  int (*fopen)(FILE *fp, const char *name, const char *mode);
 
  int (*fclose)(FILE *fp);
 
  int (*read)(FILE *fp, unsigned char *buf, int size);
 
  int (*write)(FILE *fp, unsigned char *buf, int size);
 
  int (*seek)(FILE *fp, long offset, int whence);
 
  int (*remove)(const char *name);
 
  int (*getbyte)(FILE *fp);
 
  int (*putbyte)(int c, FILE *fp);
};
 
extern _Driver *_driverlist[];
 
/* some standard functions that are useful in drivers */
 
int _null_read(FILE *fp, unsigned char *buf, int size);
int _null_write(FILE *fp, unsigned char *buf, int size);
 
int _term_read(FILE *fp, unsigned char *buf, int size);
int _term_write(FILE *fp, unsigned char *buf, int size);
 
#endif