Device I/O Support

This group contains the Device I/O Support API and implementation. More...

Files
file	iobase64.c
	This source file contains the implementation of _IO_Base64() and _IO_Base64url().
file	ioprintf.c
	This source file contains the implementation of _IO_Printf().
file	iorelax.c
	This source file contains the implementation of _IO_Relax().
file	iovprintf.c
	This source file contains the implementation of _IO_Vprintf().
file	io.h
	This header file provides the interfaces of the Device I/O Support.

Typedefs
typedef void(*	IO_Put_char) (int c, void *arg)
	This type defines the put character handler. More...

Functions
int	_IO_Printf (IO_Put_char put_char, void *arg, char const *fmt,...) RTEMS_PRINTFLIKE(3
	Prints characters using the put character handler according to the format string. More...
int int	_IO_Vprintf (IO_Put_char put_char, void *arg, char const *fmt, va_list ap)
	Prints characters using the put character handler according to the format string. More...
int	_IO_Base64 (IO_Put_char put_char, void *arg, const void *src, size_t len, const char *wordbreak, int wordlen)
	Outputs the source buffer in base64 encoding. More...
int	_IO_Base64url (IO_Put_char put_char, void *arg, const void *src, size_t len, const char *wordbreak, int wordlen)
	Outputs the source buffer in base64url encoding. More...
void	_IO_Relax (void)
	Issues a couple of no-operation instructions. More...

Detailed Description

This group contains the Device I/O Support API and implementation.

Typedef Documentation

IO_Put_char

typedef void(* IO_Put_char) (int c, void *arg)

This type defines the put character handler.

Parameters

c	is the character to put.
arg	is the user-provided argument.

Function Documentation

_IO_Base64()

int _IO_Base64	(	IO_Put_char	put_char,
		void *	arg,
		const void *	src,
		size_t	len,
		const char *	wordbreak,
		int	wordlen
	)

Outputs the source buffer in base64 encoding.

After word length of output characters produced by the encoding a word break is produced.

Parameters

put_char	is the put character function used to output the encoded source buffer.
arg	is the argument passed to the put character function.
src	is the pointer to the source buffer begin.
srclen	is the length of the source buffer in bytes.
wordbreak	is the word break string.
wordlen	is the word length in bytes. If the word length is less than four, then a word length of four will be used.

Returns

Returns the count of output characters.

_IO_Base64url()

int _IO_Base64url	(	IO_Put_char	put_char,
		void *	arg,
		const void *	src,
		size_t	len,
		const char *	wordbreak,
		int	wordlen
	)

Outputs the source buffer in base64url encoding.

After word length of output characters produced by the encoding a word break is produced.

Parameters

put_char	is the put character function used to output the encoded source buffer.
arg	is the argument passed to the put character function.
src	is the pointer to the source buffer begin.
srclen	is the length of the source buffer in bytes.
wordbreak	is the word break string.
wordlen	is the word length in bytes. If the word length is less than four, then a word length of four will be used.

Returns

Returns the count of output characters.

_IO_Printf()

int _IO_Printf	(	IO_Put_char	put_char,
		void *	arg,
		char const *	fmt,
			...
	)

Prints characters using the put character handler according to the format string.

Parameters

put_char	is the put character handler.
arg	is the user-provided argument for the put character handler.
fmt	is the printf()-style format string.
...	is the list of parameters required by the format string.

Returns

Returns the count of put characters.

_IO_Relax()

void _IO_Relax

(

void

)

Issues a couple of no-operation instructions.

This function may be used to burn a couple of processor cycles with minimum impact on the system bus. It may be used in busy wait loops.

_IO_Vprintf()

int int _IO_Vprintf	(	IO_Put_char	put_char,
		void *	arg,
		char const *	fmt,
		va_list	ap
	)

Prints characters using the put character handler according to the format string.

Parameters

put_char	is the put character handler.
arg	is the user-provided argument for the put character handler.
fmt	is the printf()-style format string.
ap	is the argument list required by the format string.

Returns

Returns the count of put characters.