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// 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 (
"os"
"strconv"
"strings"
)
func parseZones(s string) (zt []zonetime) {
f := strings.Fields(s)
if len(f) < 4 {
return
}
// standard timezone offset
o, err := strconv.Atoi(f[1])
if err != nil {
return
}
std := &zone{name: f[0], utcoff: o, isdst: false}
// alternate timezone offset
o, err = strconv.Atoi(f[3])
if err != nil {
return
}
dst := &zone{name: f[2], utcoff: o, isdst: true}
// transition time pairs
f = f[4:]
for i := 0; i < len(f); i++ {
z := std
if i%2 == 0 {
z = dst
}
t, err := strconv.Atoi(f[i])
if err != nil {
return nil
}
t -= std.utcoff
zt = append(zt, zonetime{time: int32(t), zone: z})
}
return
}
func setupZone() {
t, err := os.Getenverror("timezone")
if err != nil {
// do nothing: use UTC
return
}
zones = parseZones(t)
}
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