vfs.h

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#pragma once
 
#include <errno.h>
#include <stdint.h>
#include <sys/stat.h>
#include <unistd.h>
 
struct fs_driver {
    ssize_t (*read_r)(struct _reent*, void* const, uint8_t*, const size_t);
    int (*write_r)(struct _reent*, void* const, const uint8_t*, const size_t);
    int (*close_r)(struct _reent*, void* const);
    int (*fstat_r)(struct _reent*, void* const, struct stat*);
    int (*isatty_r)(struct _reent*, void* const);
    off_t (*lseek_r)(struct _reent*, void* const, off_t, int);
    int (*ctl)(void* const, const uint32_t, void* const);
};
 
struct file_entry {
    struct fs_driver const* driver;
    void* arg;
};
 
// adds an entry to the file table
int vfs_add_entry_r(struct _reent* r, struct fs_driver const* const driver, void* arg);
 
// update an entry to the file table. Returns -1 if there was an error.
// If driver is NULL, then the driver isn't updated. If arg is (void*)-1, then
// the arg isn't updated.
int vfs_update_entry(int file, struct fs_driver const* const driver, void* arg);