1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Parse Plan 9 timezone(2) files.
package time
import (
"syscall"
)
var platformZoneSources []string // none on Plan 9
func isSpace(r rune) bool {
return r == ' ' || r == '\t' || r == '\n'
}
// Copied from strings to avoid a dependency.
func fields(s string) []string {
// First count the fields.
n := 0
inField := false
for _, rune := range s {
wasInField := inField
inField = !isSpace(rune)
if inField && !wasInField {
n++
}
}
// Now create them.
a := make([]string, n)
na := 0
fieldStart := -1 // Set to -1 when looking for start of field.
for i, rune := range s {
if isSpace(rune) {
if fieldStart >= 0 {
a[na] = s[fieldStart:i]
na++
fieldStart = -1
}
} else if fieldStart == -1 {
fieldStart = i
}
}
if fieldStart >= 0 { // Last field might end at EOF.
a[na] = s[fieldStart:]
}
return a
}
func loadZoneDataPlan9(s string) (l *Location, err error) {
f := fields(s)
if len(f) < 4 {
if len(f) == 2 && f[0] == "GMT" {
return UTC, nil
}
return nil, errBadData
}
var zones [2]zone
// standard timezone offset
o, err := atoi(f[1])
if err != nil {
return nil, errBadData
}
zones[0] = zone{name: f[0], offset: o, isDST: false}
// alternate timezone offset
o, err = atoi(f[3])
if err != nil {
return nil, errBadData
}
zones[1] = zone{name: f[2], offset: o, isDST: true}
// transition time pairs
var tx []zoneTrans
f = f[4:]
for i := 0; i < len(f); i++ {
zi := 0
if i%2 == 0 {
zi = 1
}
t, err := atoi(f[i])
if err != nil {
return nil, errBadData
}
t -= zones[0].offset
tx = append(tx, zoneTrans{when: int64(t), index: uint8(zi)})
}
// Committed to succeed.
l = &Location{zone: zones[:], tx: tx}
// Fill in the cache with information about right now,
// since that will be the most common lookup.
sec, _, _ := now()
for i := range tx {
if tx[i].when <= sec && (i+1 == len(tx) || sec < tx[i+1].when) {
l.cacheStart = tx[i].when
l.cacheEnd = omega
if i+1 < len(tx) {
l.cacheEnd = tx[i+1].when
}
l.cacheZone = &l.zone[tx[i].index]
}
}
return l, nil
}
func loadZoneFilePlan9(name string) (*Location, error) {
b, err := readFile(name)
if err != nil {
return nil, err
}
return loadZoneDataPlan9(string(b))
}
func initLocal() {
t, ok := syscall.Getenv("timezone")
if ok {
if z, err := loadZoneDataPlan9(t); err == nil {
localLoc = *z
return
}
} else {
if z, err := loadZoneFilePlan9("/adm/timezone/local"); err == nil {
localLoc = *z
localLoc.name = "Local"
return
}
}
// Fall back to UTC.
localLoc.name = "UTC"
}
|
