1 use super::syscall::PosixTimeT;
2 /// 一小时所包含的秒数
3 const SECS_PER_HOUR: i64 = 60 * 60;
4 /// 一天所包含的秒数
5 const SECS_PER_DAY: i64 = SECS_PER_HOUR * 24;
6 /// 每年中每个月最后一天所对应天数
7 const MON_OF_YDAY: [[i64; 13]; 2] = [
8 // 普通年
9 [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365],
10 // 闰年
11 [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366],
12 ];
13 #[derive(Debug)]
14 #[allow(dead_code)]
15 pub struct CalendarTime {
16 tm_sec: i32,
17 tm_min: i32,
18 tm_hour: i32,
19 tm_mday: i32,
20 tm_mon: i32,
21 tm_wday: i32,
22 tm_yday: i32,
23 tm_year: i32,
24 }
25 impl CalendarTime {
new() -> Self26 pub fn new() -> Self {
27 CalendarTime {
28 tm_year: Default::default(),
29 tm_sec: Default::default(),
30 tm_min: Default::default(),
31 tm_hour: Default::default(),
32 tm_mday: Default::default(),
33 tm_mon: Default::default(),
34 tm_wday: Default::default(),
35 tm_yday: Default::default(),
36 }
37 }
38 }
39
40 /// # 判断是否是闰年
41 ///
42 /// ## 参数
43 ///
44 /// * 'year' - 年份
is_leap(year: u32) -> bool45 fn is_leap(year: u32) -> bool {
46 let mut flag = false;
47 if (year % 4 == 0 && year % 100 != 0) || year % 400 == 0 {
48 flag = true;
49 }
50 return flag;
51 }
52
53 /// # 计算除法
54 ///
55 /// # 参数
56 ///
57 /// * 'left' - 被除数
58 /// * 'right' - 除数
math_div(left: u32, right: u32) -> u3259 fn math_div(left: u32, right: u32) -> u32 {
60 return left / right;
61 }
62
63 /// # 计算两年之间的闰年数目
64 ///
65 /// ## 参数
66 ///
67 /// * 'y1' - 起始年份
68 /// * 'y2' - 结束年份
leaps_between(y1: u32, y2: u32) -> u3269 fn leaps_between(y1: u32, y2: u32) -> u32 {
70 // 算出y1之前的闰年数量
71 let y1_leaps = math_div(y1 - 1, 4) - math_div(y1 - 1, 100) + math_div(y1 - 1, 400);
72 // 算出y2之前的闰年数量
73 let y2_leaps = math_div(y2 - 1, 4) - math_div(y2 - 1, 100) + math_div(y2 - 1, 400);
74
75 y2_leaps - y1_leaps
76 }
77
78 /// # 将秒数转换成日期
79 ///
80 /// ## 参数
81 ///
82 /// * 'totalsecs' - 1970年1月1日 00:00:00 UTC到现在的秒数
83 /// * 'offset' - 指定的秒数对应的时间段（含）的偏移量（以秒为单位）
84 #[allow(dead_code)]
time_to_calendar(totalsecs: PosixTimeT, offset: i32) -> CalendarTime85 pub fn time_to_calendar(totalsecs: PosixTimeT, offset: i32) -> CalendarTime {
86 let mut result = CalendarTime::new();
87 // 计算对应的天数
88 let mut days = totalsecs / SECS_PER_DAY;
89 // 一天中剩余的秒数
90 let mut rem = totalsecs % SECS_PER_DAY;
91
92 // 加入偏移量
93 rem += offset as i64;
94 while rem < 0 {
95 rem += SECS_PER_DAY;
96 days -= 1;
97 }
98 while rem >= SECS_PER_DAY {
99 rem -= SECS_PER_DAY;
100 days += 1;
101 }
102 // 计算对应的小时数
103 result.tm_hour = (rem / SECS_PER_HOUR) as i32;
104 rem %= SECS_PER_HOUR;
105
106 // 计算对应的分钟数
107 result.tm_min = (rem / 60) as i32;
108 rem %= 60;
109
110 // 秒数
111 result.tm_sec = rem as i32;
112
113 // totalsec是从1970年1月1日 00:00:00 UTC到现在的秒数
114 // 当时是星期四
115 result.tm_wday = ((4 + days) % 7) as i32;
116
117 let mut year = 1970;
118 while days < 0 || (is_leap(year) && days >= 366) || (!is_leap(year) && days >= 365) {
119 // 假设每一年都是365天，计算出大概的年份
120 let guess_year = year + math_div(days.try_into().unwrap(), 365);
121 // 将已经计算过的天数去掉
122 days -= ((guess_year - year) * 365 + leaps_between(year, guess_year)) as i64;
123 year = guess_year;
124 }
125 result.tm_year = (year - 1900) as i32;
126 result.tm_yday = days as i32;
127 let mut il = 0;
128 if is_leap(year) {
129 il = 1
130 };
131 let mut mon = 0;
132 for i in MON_OF_YDAY[il] {
133 if days < i {
134 break;
135 }
136 mon += 1;
137 }
138 days -= MON_OF_YDAY[il][mon - 1];
139 result.tm_mon = (mon - 1) as i32;
140 result.tm_mday = (days + 1) as i32;
141
142 result
143 }
144