1 files changed, 59 insertions, 0 deletions
diff --git a/src/pkg/time/zoneinfo_plan9.go b/src/pkg/time/zoneinfo_plan9.go
new file mode 100644
index 000000000..3c3e7c424
--- /dev/null
+++ b/src/pkg/time/zoneinfo_plan9.go
@@ -0,0 +1,59 @@
+// 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)
+}