Implement SysInfo for iOS

base/sys_info_ios.mm

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/sys_info.h"
 
-#include <ApplicationServices/ApplicationServices.h>
-#include <CoreServices/CoreServices.h>
-#include <mach/mach_host.h>
-#include <mach/mach_init.h>
+#import <UIKit/UIKit.h>
+#include <mach/mach.h>
 
 #include "base/logging.h"
-#include "base/stringprintf.h"
+#include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/sys_string_conversions.h"
 
 namespace base {
 
 // static
 std::string SysInfo::OperatingSystemName() {
-  return "Mac OS X";
+  base::mac::ScopedNSAutoreleasePool pool;
+  // Examples of returned value: 'iPhone OS' on iPad 5.1.1
+  // and iPhone 5.1.1.
+  return SysNSStringToUTF8([[UIDevice currentDevice] systemName]);
 }
 
 // static
 std::string SysInfo::OperatingSystemVersion() {
-  int32 major, minor, bugfix;
-  OperatingSystemVersionNumbers(&major, &minor, &bugfix);
-  return base::StringPrintf("%d.%d.%d", major, minor, bugfix);
+  base::mac::ScopedNSAutoreleasePool pool;
+  return SysNSStringToUTF8([[UIDevice currentDevice] systemVersion]);
 }
 
 // static
 void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
                                             int32* minor_version,
                                             int32* bugfix_version) {
-  Gestalt(gestaltSystemVersionMajor,
-      reinterpret_cast<SInt32*>(major_version));
-  Gestalt(gestaltSystemVersionMinor,
-      reinterpret_cast<SInt32*>(minor_version));
-  Gestalt(gestaltSystemVersionBugFix,
-      reinterpret_cast<SInt32*>(bugfix_version));
+  base::mac::ScopedNSAutoreleasePool pool;
+  NSString* version = [[UIDevice currentDevice] systemVersion];
+  NSArray* version_info = [version componentsSeparatedByString:@"."];
+  NSUInteger length = [version_info count];
+
+  *major_version = [[version_info objectAtIndex:0] intValue];
+
+  if (length >= 2)
+    *minor_version = [[version_info objectAtIndex:1] intValue];
+  else
+    *minor_version = 0;
+
+  if (length >= 3)
+    *bugfix_version = [[version_info objectAtIndex:2] intValue];
+  else
+    *bugfix_version = 0;
 }
 
 // static
 int64 SysInfo::AmountOfPhysicalMemory() {
   struct host_basic_info hostinfo;
   mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
   int result = host_info(mach_host_self(),
                          HOST_BASIC_INFO,
                          reinterpret_cast<host_info_t>(&hostinfo),
                          &count);
-  DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
   if (result != KERN_SUCCESS) {
     NOTREACHED();
     return 0;
   }
-
+  DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
   return static_cast<int64>(hostinfo.max_mem);
 }
 
 }  // namespace base