bcd.h
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1 /*
2  * Copyright (C) 2017 Freie Universität Berlin
3  *
4  * This file is subject to the terms and conditions of the GNU Lesser
5  * General Public License v2.1. See the file LICENSE in the top level
6  * directory for more details.
7  */
8 
21 #ifndef BCD_H
22 #define BCD_H
23 
24 #include <stdbool.h>
25 #include <stddef.h>
26 #include <stdint.h>
27 
28 #ifdef __cplusplus
29 extern "C" {
30 #endif
31 
39 static inline uint8_t bcd_from_byte(uint8_t byte)
40 {
41  /* ((byte / 10) << 4) | (byte % 10) */
42  return byte + (6 * (byte / 10));
43 }
44 
52 static inline uint8_t bcd_to_byte(uint8_t bcd)
53 {
54  /* == (10 * (bcd >> 4)) + (bcd & 0xf) */
55  return bcd - (6 * (bcd >> 4));
56 }
57 
72 int bcd_buf_from_u32(uint32_t val, void *dst, size_t len);
73 
83 uint32_t bcd_buf_to_u32(const void *src, size_t len);
84 
93 uint64_t bcd_buf_to_u64(const void *src, size_t len);
94 
108 int bcd_buf_from_str(const char *str, size_t str_len,
109  void *dst, size_t dst_len);
110 
111 #ifdef __cplusplus
112 }
113 #endif
114 
115 #endif /* BCD_H */
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:52
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:39
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.