mirror of git://gcc.gnu.org/git/gcc.git
87 lines
2.0 KiB
Go
87 lines
2.0 KiB
Go
// 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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// +build darwin,386 darwin,amd64 dragonfly freebsd linux nacl netbsd openbsd solaris
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// Parse "zoneinfo" time zone file.
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// This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.
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// See tzfile(5), http://en.wikipedia.org/wiki/Zoneinfo,
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// and ftp://munnari.oz.au/pub/oldtz/
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package time
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import (
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"errors"
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"runtime"
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"syscall"
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)
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func initTestingZone() {
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syscall.Setenv("TZ", "America/Los_Angeles")
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initLocal()
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}
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// Many systems use /usr/share/zoneinfo, Solaris 2 has
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// /usr/share/lib/zoneinfo, IRIX 6 has /usr/lib/locale/TZ.
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var zoneDirs = []string{
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"/usr/share/zoneinfo/",
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"/usr/share/lib/zoneinfo/",
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"/usr/lib/locale/TZ/",
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runtime.GOROOT() + "/lib/time/zoneinfo.zip",
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}
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var origZoneDirs = zoneDirs
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func forceZipFileForTesting(zipOnly bool) {
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zoneDirs = make([]string, len(origZoneDirs))
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copy(zoneDirs, origZoneDirs)
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if zipOnly {
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for i := 0; i < len(zoneDirs)-1; i++ {
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zoneDirs[i] = "/XXXNOEXIST"
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}
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}
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}
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func initLocal() {
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// consult $TZ to find the time zone to use.
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// no $TZ means use the system default /etc/localtime.
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// $TZ="" means use UTC.
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// $TZ="foo" means use /usr/share/zoneinfo/foo.
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tz, ok := syscall.Getenv("TZ")
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switch {
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case !ok:
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z, err := loadZoneFile("", "/etc/localtime")
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if err == nil {
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localLoc = *z
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localLoc.name = "Local"
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return
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}
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case tz != "" && tz != "UTC":
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if z, err := loadLocation(tz); err == nil {
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localLoc = *z
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return
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}
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}
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// Fall back to UTC.
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localLoc.name = "UTC"
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}
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func loadLocation(name string) (*Location, error) {
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var firstErr error
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for _, zoneDir := range zoneDirs {
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if z, err := loadZoneFile(zoneDir, name); err == nil {
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z.name = name
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return z, nil
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} else if firstErr == nil && !isNotExist(err) {
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firstErr = err
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}
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}
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if firstErr != nil {
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return nil, firstErr
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}
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return nil, errors.New("unknown time zone " + name)
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}
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