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#ifndef _GPXE_VSPRINTF_H
#define _GPXE_VSPRINTF_H
/** @file
*
* printf() and friends
*
* Etherboot's printf() functions understand the following subset of
* the standard C printf()'s format specifiers:
*
* - Flag characters
* - '#' - Alternate form (i.e. "0x" prefix)
* - '0' - Zero-pad
* - Field widths
* - Length modifiers
* - 'hh' - Signed / unsigned char
* - 'h' - Signed / unsigned short
* - 'l' - Signed / unsigned long
* - 'll' - Signed / unsigned long long
* - 'z' - Signed / unsigned size_t
* - Conversion specifiers
* - 'd' - Signed decimal
* - 'x','X' - Unsigned hexadecimal
* - 'c' - Character
* - 's' - String
* - 'p' - Pointer
*
* Hexadecimal numbers are always zero-padded to the specified field
* width (if any); decimal numbers are always space-padded. Decimal
* long longs are not supported.
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>
/**
* A printf context
*
* Contexts are used in order to be able to share code between
* vprintf() and vsnprintf(), without requiring the allocation of a
* buffer for vprintf().
*/
struct printf_context {
/**
* Character handler
*
* @v ctx Context
* @v c Character
*
* This method is called for each character written to the
* formatted string.
*/
void ( * handler ) ( struct printf_context *ctx, unsigned int c );
/** Length of formatted string
*
* When handler() is called, @len will be set to the number of
* characters written so far (i.e. zero for the first call to
* handler()).
*/
size_t len;
};
extern size_t vcprintf ( struct printf_context *ctx, const char *fmt,
va_list args );
extern int vssnprintf ( char *buf, ssize_t ssize, const char *fmt,
va_list args );
extern int __attribute__ (( format ( printf, 3, 4 ) ))
ssnprintf ( char *buf, ssize_t ssize, const char *fmt, ... );
#endif /* _GPXE_VSPRINTF_H */
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