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time & date.
rename AddrToInt, StatToInt, etc -> BytePtr, StatPtr, ... R=r OCL=15450 CL=15456
This commit is contained in:
Russ Cox
parent
119324d785
commit
9f35e8b227
14 changed files with 515 additions and 29 deletions
365
src/lib/time/time.go
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365
src/lib/time/time.go
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@ -0,0 +1,365 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package time
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import (
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"os";
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"time"
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)
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// Seconds since January 1, 1970 00:00:00 GMT
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export func Seconds() (sec int64, err *os.Error) {
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var nsec int64;
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sec, nsec, err = os.Time()
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return sec, err
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}
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// Nanoseconds since January 1, 1970 00:00:00 GMT
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export func Nanoseconds() (nsec int64, err *os.Error) {
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var sec int64;
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sec, nsec, err = os.Time()
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return sec*1e9 + nsec, err
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}
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export const (
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Sunday = iota;
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Monday;
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Tuesday;
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Wednesday;
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Thursday;
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Friday;
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Saturday;
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)
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export type Time struct {
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year int64; // 2008 is 2008
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month, day int; // Sep-17 is 9, 17
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hour, minute, second int; // 10:43:12 is 10, 43, 12
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weekday int; // Sunday = 0, Monday = 1, ...
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zoneoffset int; // seconds west of UTC
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zone string;
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}
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var RegularMonths = []int{
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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}
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var LeapMonths = []int{
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31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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}
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func Months(year int64) *[]int {
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if year%4 == 0 && (year%100 != 0 || year%400 == 0) {
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return &LeapMonths
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} else {
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return &RegularMonths
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}
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return nil // not reached
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}
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const (
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SecondsPerDay = 24*60*60;
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DaysPer400Years = 365*400+97;
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DaysPer100Years = 365*100+24;
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DaysPer4Years = 365*4+1;
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Days1970To2001 = 31*365+8;
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)
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export func SecondsToUTC(sec int64) *Time {
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t := new(Time);
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// Split into time and day.
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day := sec/SecondsPerDay;
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sec -= day*SecondsPerDay;
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if sec < 0 {
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day--
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sec += SecondsPerDay
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}
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// Time
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t.hour = int(sec/3600);
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t.minute = int((sec/60)%60);
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t.second = int(sec%60);
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// Day 0 = January 1, 1970 was a Thursday
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t.weekday = int((day + Thursday) % 7)
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if t.weekday < 0 {
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t.weekday += 7
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}
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// Change day from 0 = 1970 to 0 = 2001,
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// to make leap year calculations easier
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// (2001 begins 4-, 100-, and 400-year cycles ending in a leap year.)
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day -= Days1970To2001;
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year := int64(2001)
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if day < 0 {
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// Go back enough 400 year cycles to make day positive.
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n := -day/DaysPer400Years + 1;
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year -= 400*n;
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day += DaysPer400Years*n;
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} else {
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// Cut off 400 year cycles.
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n := day/DaysPer400Years;
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year += 400*n;
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day -= DaysPer400Years*n;
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}
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// Cut off 100-year cycles
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n := day/DaysPer100Years;
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year += 100*n;
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day -= DaysPer100Years*n;
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// Cut off 4-year cycles
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n = day/DaysPer4Years;
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year += 4*n;
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day -= DaysPer4Years*n;
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// Cut off non-leap years.
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n = day/365;
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year += n;
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day -= 365*n;
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t.year = year;
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// If someone ever needs yearday,
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// tyearday = day (+1?)
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months := Months(year);
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var m int;
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yday := int(day);
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for m = 0; m < 12 && yday >= months[m]; m++ {
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yday -= months[m]
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}
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t.month = m+1;
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t.day = yday+1;
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t.zone = "GMT";
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return t;
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}
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export func UTC() (t *Time, err *os.Error) {
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var sec int64;
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sec, err = Seconds()
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if err != nil {
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return nil, err
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}
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return SecondsToUTC(sec), nil
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}
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// TODO: Should this return an error?
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export func SecondsToLocalTime(sec int64) *Time {
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zone, offset, ok := time.LookupTimezone(sec)
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if !ok {
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return SecondsToUTC(sec)
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}
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t := SecondsToUTC(sec+int64(offset));
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t.zone = zone;
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t.zoneoffset = offset;
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return t
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}
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export func LocalTime() (t *Time, err *os.Error) {
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var sec int64;
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sec, err = Seconds()
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if err != nil {
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return nil, err
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}
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return SecondsToLocalTime(sec), nil
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}
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// Compute number of seconds since January 1, 1970.
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func (t *Time) Seconds() int64 {
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// First, accumulate days since January 1, 2001.
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// Using 2001 instead of 1970 makes the leap-year
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// handling easier (see SecondsToUTC), because
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// it is at the beginning of the 4-, 100-, and 400-year cycles.
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day := int64(0);
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// Rewrite year to be >= 2001.
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year := t.year;
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if year < 2001 {
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n := (2001 - year)/400 + 1;
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year += 400*n;
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day -= DaysPer400Years*n;
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}
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// Add in days from 400-year cycles.
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n := (year - 2001) / 400;
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year -= 400*n;
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day += DaysPer400Years*n;
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// Add in 100-year cycles.
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n = (year - 2001) / 100;
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year -= 100*n;
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day += DaysPer100Years*n;
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// Add in 4-year cycles.
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n = (year - 2001) / 4;
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year -= 4*n;
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day += DaysPer4Years*n;
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// Add in non-leap years.
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n = year - 2001;
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day += 365*n;
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// Add in days this year.
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months := Months(t.year);
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for m := 0; m < t.month-1; m++ {
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day += int64(months[m])
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}
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day += int64(t.day - 1);
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// Convert days to seconds since January 1, 2001.
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sec := day * SecondsPerDay;
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// Add in time elapsed today.
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sec += int64(t.hour) * 3600;
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sec += int64(t.minute) * 60;
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sec += int64(t.second);
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// Convert from seconds since 2001 to seconds since 1970.
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sec += Days1970To2001 * SecondsPerDay;
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// Account for local time zone.
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sec -= int64(t.zoneoffset)
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return sec
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}
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var LongDayNames = []string{
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"Sunday",
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"Monday",
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"Tuesday",
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"Wednesday",
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"Thursday",
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"Friday",
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"Saturday"
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}
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var ShortDayNames = []string{
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"Sun",
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"Mon",
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"Tue",
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"Wed",
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"Thu",
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"Fri",
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"Sat"
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}
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var ShortMonthNames = []string{
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec"
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}
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func Copy(dst *[]byte, s string) {
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for i := 0; i < len(s); i++ {
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dst[i] = s[i]
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}
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}
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func Decimal(dst *[]byte, n int) {
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if n < 0 {
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n = 0
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}
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for i := len(dst)-1; i >= 0; i-- {
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dst[i] = byte(n%10 + '0');
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n /= 10
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}
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}
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func AddString(buf *[]byte, bp int, s string) int {
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n := len(s);
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Copy(buf[bp:bp+n], s)
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return bp+n
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}
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// Just enough of strftime to implement the date formats below.
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// Not exported.
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func Format(t *Time, fmt string) string {
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buf := new([]byte, 128);
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bp := 0
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for i := 0; i < len(fmt); i++ {
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if fmt[i] == '%' {
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i++
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switch fmt[i] {
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case 'A': // %A full weekday name
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bp = AddString(buf, bp, LongDayNames[t.weekday])
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case 'a': // %a abbreviated weekday name
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bp = AddString(buf, bp, ShortDayNames[t.weekday])
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case 'b': // %b abbreviated month name
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bp = AddString(buf, bp, ShortMonthNames[t.month-1])
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case 'd': // %d day of month (01-31)
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Decimal(buf[bp:bp+2], t.day);
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bp += 2
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case 'e': // %e day of month ( 1-31)
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if t.day >= 10 {
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Decimal(buf[bp:bp+2], t.day)
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} else {
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buf[bp] = ' ';
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buf[bp+1] = byte(t.day + '0')
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}
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bp += 2
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case 'H': // %H hour 00-23
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Decimal(buf[bp:bp+2], t.hour);
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bp += 2
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case 'M': // %M minute 00-59
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Decimal(buf[bp:bp+2], t.minute);
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bp += 2
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case 'S': // %S second 00-59
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Decimal(buf[bp:bp+2], t.second);
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bp += 2
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case 'Y': // %Y year 2008
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Decimal(buf[bp:bp+4], int(t.year));
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bp += 4
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case 'y': // %y year 08
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Decimal(buf[bp:bp+2], int(t.year%100));
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bp += 2
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case 'Z':
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bp = AddString(buf, bp, t.zone)
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default:
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buf[bp] = '%';
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buf[bp+1] = fmt[i];
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bp += 2
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}
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} else {
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buf[bp] = fmt[i];
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bp++
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}
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}
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return string(buf[0:bp])
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}
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// ANSI C asctime: Sun Nov 6 08:49:37 1994
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func (t *Time) Asctime() string {
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return Format(t, "%a %b %e %H:%M:%S %Y")
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}
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// RFC 850: Sunday, 06-Nov-94 08:49:37 GMT
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func (t *Time) RFC850() string {
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return Format(t, "%A, %d-%b-%y %H:%M:%S %Z")
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}
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// RFC 1123: Sun, 06 Nov 1994 08:49:37 GMT
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func (t *Time) RFC1123() string {
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return Format(t, "%a, %d %b %Y %H:%M:%S %Z")
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}
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// date(1) - Sun Nov 6 08:49:37 GMT 1994
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func (t *Time) String() string {
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return Format(t, "%a %b %e %H:%M:%S %Z %Y")
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}
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