bcd.h
Go to the documentation of this file.
1 /*
2  * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
3  * SPDX-License-Identifier: LGPL-2.1-only
4  */
5 
6 #pragma once
7 
21 #include <stdbool.h>
22 #include <stddef.h>
23 #include <stdint.h>
24 
25 #ifdef __cplusplus
26 extern "C" {
27 #endif
28 
36 static inline uint8_t bcd_from_byte(uint8_t byte)
37 {
38  /* ((byte / 10) << 4) | (byte % 10) */
39  return byte + (6 * (byte / 10));
40 }
41 
49 static inline uint8_t bcd_to_byte(uint8_t bcd)
50 {
51  /* == (10 * (bcd >> 4)) + (bcd & 0xf) */
52  return bcd - (6 * (bcd >> 4));
53 }
54 
69 int bcd_buf_from_u32(uint32_t val, void *dst, size_t len);
70 
80 uint32_t bcd_buf_to_u32(const void *src, size_t len);
81 
90 uint64_t bcd_buf_to_u64(const void *src, size_t len);
91 
105 int bcd_buf_from_str(const char *str, size_t str_len,
106  void *dst, size_t dst_len);
107 
108 #ifdef __cplusplus
109 }
110 #endif
111 
bcd_buf_to_u32
uint32_t bcd_buf_to_u32(const void *src, size_t len)
Convert a BCD buffer into it's binary representation (This will reverse bcd_buf_from_u32)
bcd_to_byte
static uint8_t bcd_to_byte(uint8_t bcd)
Converts a binary coded decimal to a byte.
Definition: bcd.h:49
bcd_buf_from_u32
int bcd_buf_from_u32(uint32_t val, void *dst, size_t len)
Convert a decimal value into a BCD buffer.
bcd_from_byte
static uint8_t bcd_from_byte(uint8_t byte)
Converts a byte to a binary coded decimal.
Definition: bcd.h:36
bcd_buf_from_str
int bcd_buf_from_str(const char *str, size_t str_len, void *dst, size_t dst_len)
Convert a string into a BCD buffer Digits may be separated by any character.
bcd_buf_to_u64
uint64_t bcd_buf_to_u64(const void *src, size_t len)
Convert a BCD buffer into it's binary representation.