code review 163085: move ReadFile, WriteFile, and ReadDir into a separate i...

src/pkg/time/zoneinfo.go

 // Copyright 2009 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 "zoneinfo" time zone file.
 // This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.
 // See tzfile(5), http://en.wikipedia.org/wiki/Zoneinfo,
 // and ftp://munnari.oz.au/pub/oldtz/
 
 package time
 
 import (
-        "io";
+        "io/ioutil";
         "once";
         "os";
 )
 
 const (
         headerSize      = 4 + 16 + 4*7;
         zoneDir         = "/usr/share/zoneinfo/";
 )
 
 // Simple I/O interface to binary blob of data.
@@ skipping 164 matching lines @@
                         zt[i].isstd = isstd[i] != 0
                 }
                 if i < len(isutc) {
                         zt[i].isutc = isutc[i] != 0
                 }
         }
         return zt, true;
 }
 
 func readinfofile(name string) ([]zonetime, bool) {
-        buf, err := io.ReadFile(name);
+        buf, err := ioutil.ReadFile(name);
         if err != nil {
                 return nil, false
         }
         return parseinfo(buf);
 }
 
 var zones []zonetime
 
 func setupZone() {
         // consult $TZ to find the time zone to use.
@@ skipping 24 matching lines @@
                 m := len(tz) / 2;
                 if sec < int64(tz[m].time) {
                         tz = tz[0:m]
                 } else {
                         tz = tz[m:]
                 }
         }
         z := tz[0].zone;
         return z.name, z.utcoff;
 }