// much less dot dot. Likewise, none begin with a slash.
		return nil, errLocation
	}
	zoneinfoOnce.Do(func() {
		env, _ := syscall.Getenv("ZONEINFO")
		zoneinfo = &env
	})
	var firstErr error
	if *zoneinfo != "" {
		if zoneData, err := loadTzinfoFromDirOrZip(*zoneinfo, name); err == nil {
			if z, err := LoadLocationFromTZData(name, zoneData); err == nil {
				return z, nil
			}
			firstErr = err

Dmitri Shuralyov <******@****.***> 1706824550 -0500

//go:build unix && !ios && !android

// Parse "zoneinfo" time zone file.
// This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.
// See tzfile(5), https://en.wikipedia.org/wiki/Zoneinfo,
// and ftp://munnari.oz.au/pub/oldtz/

package time

import (
	"syscall"
)

// Many systems use /usr/share/zoneinfo, Solaris 2 has
// /usr/share/lib/zoneinfo, IRIX 6 has /usr/lib/locale/TZ,
// NixOS has /etc/zoneinfo.

// license that can be found in the LICENSE file.

//go:build ignore

// Mkzip writes a zoneinfo.zip with the content of the current directory
// and its subdirectories, with no compression, suitable for package time.
//
// Usage:
//
//	go run ../../mkzip.go ../../zoneinfo.zip
//
// We use this program instead of 'zip -0 -r ../../zoneinfo.zip *' to get
// a reproducible generator that does not depend on which version of the

cd work
mkdir zoneinfo
curl -sS -L -O https://www.iana.org/time-zones/repository/releases/tzcode$CODE.tar.gz
curl -sS -L -O https://www.iana.org/time-zones/repository/releases/tzdata$DATA.tar.gz
tar xzf tzcode$CODE.tar.gz
tar xzf tzdata$DATA.tar.gz

if ! make CFLAGS=-DSTD_INSPIRED AWK=awk TZDIR=zoneinfo posix_only >make.out 2>&1; then
	cat make.out
	exit 2
fi

cd zoneinfo

	defer time.ResetZoneinfoForTesting()

	if zoneinfo := time.ZoneinfoForTesting(); testZoneinfo != *zoneinfo {
		t.Errorf("zoneinfo does not match env variable: got %q want %q", *zoneinfo, testZoneinfo)
	}
}

func TestBadLocationErrMsg(t *testing.T) {
	time.ResetZoneinfoForTesting()
	loc := "Asia/SomethingNotExist"
	want := errors.New("unknown time zone " + loc)
	_, err := time.LoadLocation(loc)

	localLoc = Location{}
}

func ForceUSPacificForTesting() {
	ResetLocalOnceForTest()
	localOnce.Do(initTestingZone)
}

func ZoneinfoForTesting() *string {
	return zoneinfo
}

func ResetZoneinfoForTesting() {
	zoneinfo = nil
	zoneinfoOnce = sync.Once{}
}

var (
	DisablePlatformSources = disablePlatformSources
	GorootZoneSource       = gorootZoneSource
	ParseTimeZone          = parseTimeZone

// Copyright 2023 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.

package time

// in wasip1 zoneinfo is managed by the runtime.
var platformZoneSources = []string{}

func initLocal() {
	localLoc.name = "Local"

	// set in the process's environment (if any).
	// This test runs in GOROOT/src/time, so GOROOT is "../..",
	// but it is theoretically possible
	sources := []string{"../../lib/time/zoneinfo.zip"}
	z, err := loadLocation("America/Los_Angeles", sources)
	if err != nil {
		panic("cannot load America/Los_Angeles for testing: " + err.Error() + "; you may want to use -tags=timetzdata")
	}
	z.name = "Local"

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Parse "zoneinfo" time zone file.
// This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.
// See tzfile(5), https://en.wikipedia.org/wiki/Zoneinfo,
// and ftp://munnari.oz.au/pub/oldtz/

package time

import (
	"errors"
	"internal/bytealg"
	"runtime"
	"syscall"