printf.h File Reference

#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>

Go to the source code of this file.

Macros
#define	_putchar   putchar

Functions
int	printf (const char *format,...)
int	sprintf (char *buffer, const char *format,...)
int	snprintf (char *buffer, size_t count, const char *format,...)
int	vsnprintf (char *buffer, size_t count, const char *format, va_list va)
int	fctprintf (void(*out)(char character, void *arg), void *arg, const char *format,...)

Macro Definition Documentation

_putchar

#define _putchar   putchar

Output a character to a custom device like UART, used by the printf() function This function is declared here only. You have to write your custom implementation somewhere

Parameters

character

Character to output

Function Documentation

fctprintf()

int fctprintf	(	void(*)(char character, void *arg)	out,
		void *	arg,
		const char *	format,
			...
	)

printf with output function You may use this as dynamic alternative to printf() with its fixed _putchar() output

Parameters

out	An output function which takes one character and an argument pointer
arg	An argument pointer for user data passed to output function
format	A string that specifies the format of the output

Returns

The number of characters that are sent to the output function, not counting the terminating null character

printf()

int printf	(	const char *	format,
			...
	)

Tiny printf implementation You have to implement _putchar if you use printf()

Parameters

format

A string that specifies the format of the output

Returns

The number of characters that are written into the array, not counting the terminating null character

snprintf()

int snprintf	(	char *	buffer,
		size_t	count,
		const char *	format,
			...
	)

Tiny snprintf/vsnprintf implementation

Parameters

buffer	A pointer to the buffer where to store the formatted string
count	The maximum number of characters to store in the buffer, including a terminating null character
format	A string that specifies the format of the output

Returns

The number of characters that are WRITTEN into the buffer, not counting the terminating null character If the formatted string is truncated the buffer size (count) is returned

sprintf()

int sprintf	(	char *	buffer,
		const char *	format,
			...
	)

Tiny sprintf implementation Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!

Parameters

buffer	A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
format	A string that specifies the format of the output

Returns

The number of characters that are WRITTEN into the buffer, not counting the terminating null character

vsnprintf()

int vsnprintf	(	char *	buffer,
		size_t	count,
		const char *	format,
		va_list	va
	)