file.c File Reference

#include "file.h"
#include <stdint.h>
#include <common/assert.h>
#include "kernel.h"
#include "common/string.h"
#include "common/status.h"
#include "memory/memory.h"
#include "memory/heap/kheap.h"
#include "Path.hpp"

Functions
void	fs_insert_filesystem (struct filesystem *filesystem)
	Inserts filesystem struct into internal array.
void	fs_init ()
	Initializes internal filesystem arrays.
struct filesystem *	fs_resolve (struct disk *disk)
	Resolves filesystem for given disk.
int	fopen (const char *filename, const char *str_mode)
	Opens file.
int	fread (void *ptr, uint32_t size, uint32_t nmemb, int fd)
	Reads from file.
int	fwrite (void *ptr, uint32_t size, uint32_t nmemb, int fd)
	Writes to file.
int	fseek (int fd, int offset, FILE_SEEK_MODE whence)
	Seeks into file.
int	fstat (int fd, struct file_stat *stat)
	Returns file status.
int	fclose (int fd)
	Closes file descriptor.
void	mount (const char *filename, struct filesystem *fs, void *data)

Variables
struct filesystem *	filesystems [MAX_FILESYSTEMS]
	Array holding all registered filesystems.
struct file_descriptor *	file_descriptors [MAX_FILEDESCRIPTORS]
	Array holding all open file descriptors.
struct mounted_file **	mounted
	Array holding all mounted files.

Function Documentation

fclose()

int fclose

(

int

fd

)

Closes file descriptor.

Parameters

fd	File descriptor

Returns

int Status

References filesystem::close, EIO, file_descriptor::filesystem, and file_descriptor::private_fs_descriptor.

fopen()

int fopen	(	const char *	filename,
		const char *	str_mode
	)

Opens file.

Parameters

filename	File to open
str_mode	Open mode

Returns

int Status

References assert, mounted_file::data, data, EINVARG, FILE_MODE_INVALID, filename, file_descriptor::filesystem, mounted_file::fs, file_descriptor::index, kfree(), kzalloc(), MAX_MOUNTED, MAX_PATH, memset(), mounted, path_part::next, filesystem::open, path_part::part, pathparser_free(), pathparser_parse(), file_descriptor::private_fs, file_descriptor::private_fs_descriptor, strcmp(), strcpy(), and strlen().

fread()

int fread	(	void *	ptr,
		uint32_t	size,
		uint32_t	nmemb,
		int	fd
	)

Reads from file.

Parameters

ptr	Output buffer
size	Size in bytes of block
nmemb	Number of blocks to read
fd	File descriptor

Returns

int Status

References EINVARG, file_descriptor::filesystem, file_descriptor::private_fs, file_descriptor::private_fs_descriptor, filesystem::read, and size.

fs_init()

void fs_init

(

)

Initializes internal filesystem arrays.

References file_descriptors, filesystems, kzalloc(), MAX_MOUNTED, memset(), and mounted.

fs_insert_filesystem()

void fs_insert_filesystem

(

struct filesystem *

filesystem

)

Inserts filesystem struct into internal array.

Parameters

filesystem

References fs, kernel_panic(), kprintf(), and filesystem::name.

fs_resolve()

struct filesystem * fs_resolve

(

struct disk *

disk

)

Resolves filesystem for given disk.

Parameters

disk	Disk to resolve

Returns

struct filesystem* Resolved filesystem, 0 if not resolved

References ALL_OK, filesystems, disk::fs_private, disk::id, kprintf(), MAX_FILESYSTEMS, mount(), filesystem::name, and filesystem::resolve.

fseek()

int fseek	(	int	fd,
		int	offset,
		FILE_SEEK_MODE	whence
	)

Seeks into file.

Parameters

fd	File descriptor
offset	Seek offset
whence	File seek mode (SEEK_SET for absolute, SEEK_CUR for relative)

Returns

int Status

References EIO, file_descriptor::filesystem, offset, file_descriptor::private_fs_descriptor, and filesystem::seek.

fstat()

int fstat	(	int	fd,
		struct file_stat *	stat
	)

Returns file status.

Parameters

fd	File descriptor
stat	Output file status struct

Returns

int Status

References EIO, file_descriptor::filesystem, file_descriptor::private_fs_descriptor, and filesystem::stat.

fwrite()

int fwrite	(	void *	ptr,
		uint32_t	size,
		uint32_t	nmemb,
		int	fd
	)

Writes to file.

Parameters

ptr	Input buffer
size	Size in bytes of block
nmemb	Number of blocks to read
fd	File descriptor

Returns

int Status

References EINVARG, file_descriptor::filesystem, file_descriptor::private_fs, file_descriptor::private_fs_descriptor, size, and filesystem::write.

mount()

void mount	(	const char *	filename,
		struct filesystem *	fs,
		void *	data
	)

References mounted_file::data, data, filename, mounted_file::filename, mounted_file::fs, fs, kdebug, kernel_panic(), kzalloc(), MAX_MOUNTED, and mounted.

Variable Documentation

file_descriptors

struct file_descriptor* file_descriptors[MAX_FILEDESCRIPTORS]

Array holding all open file descriptors.

filesystems

struct filesystem* filesystems[MAX_FILESYSTEMS]

Array holding all registered filesystems.

mounted

struct mounted_file** mounted

Array holding all mounted files.