mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
1940979657
bcd2bin(0x0A) happily returns 10, despite this being an invalid BCD value. RTC drivers converting possibly corrupted BCD timestamps might want to validate their input before calling bcd2bin(). Provide a macro to do so. Unlike bcd2bin and bin2bcd, out-of-line versions are not implemented. Should the macro experience enough use, this can be retrofitted. Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Link: https://lore.kernel.org/r/20221123095527.2771434-2-s.hauer@pengutronix.de Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
27 lines
683 B
C
27 lines
683 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _BCD_H
|
|
#define _BCD_H
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
#define bcd2bin(x) \
|
|
(__builtin_constant_p((u8 )(x)) ? \
|
|
const_bcd2bin(x) : \
|
|
_bcd2bin(x))
|
|
|
|
#define bin2bcd(x) \
|
|
(__builtin_constant_p((u8 )(x)) ? \
|
|
const_bin2bcd(x) : \
|
|
_bin2bcd(x))
|
|
|
|
#define bcd_is_valid(x) \
|
|
const_bcd_is_valid(x)
|
|
|
|
#define const_bcd2bin(x) (((x) & 0x0f) + ((x) >> 4) * 10)
|
|
#define const_bin2bcd(x) ((((x) / 10) << 4) + (x) % 10)
|
|
#define const_bcd_is_valid(x) (((x) & 0x0f) < 10 && ((x) >> 4) < 10)
|
|
|
|
unsigned _bcd2bin(unsigned char val) __attribute_const__;
|
|
unsigned char _bin2bcd(unsigned val) __attribute_const__;
|
|
|
|
#endif /* _BCD_H */
|