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Diffstat (limited to 'firmware/libc/gmtime.c')
-rw-r--r-- | firmware/libc/gmtime.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/firmware/libc/gmtime.c b/firmware/libc/gmtime.c new file mode 100644 index 0000000000..23b9c7b247 --- /dev/null +++ b/firmware/libc/gmtime.c | |||
@@ -0,0 +1,112 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2012 by Bertrik Sikken | ||
11 | * | ||
12 | * Based on code from: rtc_as3514.c | ||
13 | * Copyright (C) 2007 by Barry Wardell | ||
14 | * | ||
15 | * This program is free software; you can redistribute it and/or | ||
16 | * modify it under the terms of the GNU General Public License | ||
17 | * as published by the Free Software Foundation; either version 2 | ||
18 | * of the License, or (at your option) any later version. | ||
19 | * | ||
20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
21 | * KIND, either express or implied. | ||
22 | * | ||
23 | ****************************************************************************/ | ||
24 | #include <stdbool.h> | ||
25 | #include "time.h" | ||
26 | |||
27 | #define MINUTE_SECONDS 60 | ||
28 | #define HOUR_SECONDS 3600 | ||
29 | #define DAY_SECONDS 86400 | ||
30 | #define WEEK_SECONDS 604800 | ||
31 | #define YEAR_SECONDS 31536000 | ||
32 | #define LEAP_YEAR_SECONDS 31622400 | ||
33 | |||
34 | /* Days in each month */ | ||
35 | static int days_in_month[] = | ||
36 | {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; | ||
37 | |||
38 | static inline bool is_leapyear(int year) | ||
39 | { | ||
40 | return (((year%4)==0) && (((year%100)!=0) || ((year%400)==0))); | ||
41 | } | ||
42 | |||
43 | struct tm *gmtime(const time_t *timep) | ||
44 | { | ||
45 | static struct tm time; | ||
46 | return gmtime_r(timep, &time); | ||
47 | } | ||
48 | |||
49 | struct tm *gmtime_r(const time_t *timep, struct tm *tm) | ||
50 | { | ||
51 | time_t seconds = *timep; | ||
52 | int year, i, mday, hour, min; | ||
53 | |||
54 | /* weekday */ | ||
55 | tm->tm_wday = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 4) % 7; | ||
56 | |||
57 | /* Year */ | ||
58 | year = 1970; | ||
59 | while (seconds >= LEAP_YEAR_SECONDS) | ||
60 | { | ||
61 | if (is_leapyear(year)){ | ||
62 | seconds -= LEAP_YEAR_SECONDS; | ||
63 | } else { | ||
64 | seconds -= YEAR_SECONDS; | ||
65 | } | ||
66 | |||
67 | year++; | ||
68 | } | ||
69 | |||
70 | if (is_leapyear(year)) { | ||
71 | days_in_month[1] = 29; | ||
72 | } else { | ||
73 | days_in_month[1] = 28; | ||
74 | if(seconds>YEAR_SECONDS){ | ||
75 | year++; | ||
76 | seconds -= YEAR_SECONDS; | ||
77 | } | ||
78 | } | ||
79 | tm->tm_year = year%100 + 100; | ||
80 | |||
81 | /* Month */ | ||
82 | for (i = 0; i < 12; i++) | ||
83 | { | ||
84 | if (seconds < days_in_month[i]*DAY_SECONDS){ | ||
85 | tm->tm_mon = i; | ||
86 | break; | ||
87 | } | ||
88 | |||
89 | seconds -= days_in_month[i]*DAY_SECONDS; | ||
90 | } | ||
91 | |||
92 | /* Month Day */ | ||
93 | mday = seconds/DAY_SECONDS; | ||
94 | seconds -= mday*DAY_SECONDS; | ||
95 | tm->tm_mday = mday + 1; /* 1 ... 31 */ | ||
96 | |||
97 | /* Hour */ | ||
98 | hour = seconds/HOUR_SECONDS; | ||
99 | seconds -= hour*HOUR_SECONDS; | ||
100 | tm->tm_hour = hour; | ||
101 | |||
102 | /* Minute */ | ||
103 | min = seconds/MINUTE_SECONDS; | ||
104 | seconds -= min*MINUTE_SECONDS; | ||
105 | tm->tm_min = min; | ||
106 | |||
107 | /* Second */ | ||
108 | tm->tm_sec = seconds; | ||
109 | |||
110 | return tm; | ||
111 | } | ||
112 | |||