file.h File Reference

Low-level and built-in high-level file operation API. More...

#include <muteki/common.h>

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Typedefs
typedef struct file_descriptor_s	file_descriptor_t

Enumerations
enum	sys_seek_whence_e { _SYS_SEEK_SET = 0 , _SYS_SEEK_CUR , _SYS_SEEK_END }
	whence values for __fseek(). More...

Functions
file_descriptor_t *	_afopen (const char *pathname, const char *mode)
	Open a file located at pathname.
file_descriptor_t *	__wfopen (const UTF16 *pathname, const UTF16 *mode)
	Open a file located at UTF-16-encoded pathname.
size_t	_fread (void *ptr, size_t size, size_t nmemb, file_descriptor_t *stream)
	Read nmemb data units of size size from a file.
size_t	_fwrite (const void *ptr, size_t size, size_t nmemb, file_descriptor_t *stream)
	Write nmemb data units of size size to a file.
int	__fseek (file_descriptor_t *stream, long offset, int whence)
	Seek to a specific position in an opened file.
long	_ftell (file_descriptor_t *stream)
	Return the current position of the file.
int	__fflush (file_descriptor_t *stream)
	Flush the cached writes to the file.
int	_fclose (file_descriptor_t *stream)
	Close a file.

Detailed Description

Low-level and built-in high-level file operation API.

Enumeration Type Documentation

sys_seek_whence_e

enum sys_seek_whence_e

whence values for __fseek().

Enumerator
_SYS_SEEK_SET	Seek from the beginning of file.
_SYS_SEEK_CUR	Seek from current offset.
_SYS_SEEK_END	Seek from the end of file.

Function Documentation

__fflush()

int __fflush ( file_descriptor_t *  stream )

extern

Flush the cached writes to the file.

Analogous to the fflush() function in POSIX.

Parameters

stream

Pointer reference returned by _afopen() or _wfopen().

Return values

0	The operation was completed successfully.
-1	The operation failed with error.

__fseek()

int __fseek ( file_descriptor_t *  stream, long  offset, int  whence  )

extern

Seek to a specific position in an opened file.

Analogous to the fseek() function in POSIX.

Parameters

stream	Pointer reference returned by _afopen() or _wfopen().
offset	Seek offset.
whence	Treat offset as relative to start of file/current offset/end of file.

Return values

0	The operation was completed successfully.
-1	The operation failed with error.

See also

sys_seek_whence_e

__wfopen()

file_descriptor_t * __wfopen ( const UTF16 *  pathname, const UTF16 *  mode  )

extern

Open a file located at UTF-16-encoded pathname.

Analogous to the _wfopen() function in Windows.

Parameters

pathname	Path to the file to be opened. LFN (long filename) is supported.
mode	Mode. Tested modes are _BUL("rb") and _BUL("wb+").

Returns

Pointer reference to the opened file.

_afopen()

file_descriptor_t * _afopen ( const char *  pathname, const char *  mode  )

extern

Open a file located at pathname.

Analogous to the fopen() function in POSIX and Windows.

Parameters

pathname	DOS 8.3 path to the file to be opened.
mode	Mode. Tested modes are "rb" and "wb+".

Returns

Pointer reference to the opened file.

_fclose()

int _fclose ( file_descriptor_t *  stream )

extern

Close a file.

Analogous to the fclose() function in POSIX.

Parameters

stream

Pointer reference returned by _afopen() or _wfopen().

Returns

Unclear. Could be similar to POSIX fclose().

_fread()

size_t _fread ( void *  ptr, size_t  size, size_t  nmemb, file_descriptor_t *  stream  )

extern

Read nmemb data units of size size from a file.

Analogous to the POSIX fread() function.

Parameters

ptr	Pointer reference to a buffer that will hold the data read from the file.
size	Size of individual data unit.
nmemb	Number of data units to read.
stream	Pointer reference returned by _afopen() or _wfopen().

Returns

Number of data units read.

_ftell()

long _ftell ( file_descriptor_t *  stream )

extern

Return the current position of the file.

Analogous to the ftell() function in POSIX.

Parameters

stream

Pointer reference returned by _afopen() or _wfopen().

Returns

Current position when successful, -1 when there's an error.

_fwrite()

size_t _fwrite ( const void *  ptr, size_t  size, size_t  nmemb, file_descriptor_t *  stream  )

extern

Write nmemb data units of size size to a file.

Analogous to the fwrite() function in POSIX.

Parameters

ptr	Pointer reference to data that will be written to the file.
size	Size of individual data unit.
nmemb	Number of data units to write.
stream	Pointer reference returned by _afopen() or _wfopen().

Returns

Number of data units written.