Implement SysInfo for iOS

base/sys_info_ios.mm

+// 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"
+
+#import <UIKit/UIKit.h>
+#include <mach/mach.h>
+
+#include "base/logging.h"
+#include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/sys_string_conversions.h"
+
+namespace base {
+
+// static
+std::string SysInfo::OperatingSystemName() {
+  base::mac::ScopedNSAutoreleasePool pool;
+  return SysNSStringToUTF8([[UIDevice currentDevice] systemName]);

[Mark Mentovai, 2012/07/10 16:10:04]

I think we should understand what this will return on different devices, and
probably mention that in a comment here. Can you find someone with another
device type to check this?

[Chen Yu, 2012/07/10 17:07:30]

Examples added for ipad and iphone.
On 2012/07/10 16:10:04, Mark Mentovai wrote:

+}
+
+// static
+std::string SysInfo::OperatingSystemVersion() {
+  base::mac::ScopedNSAutoreleasePool pool;
+  return SysNSStringToUTF8([[UIDevice currentDevice] systemVersion]);
+}
+
+// static
+void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
+                                            int32* minor_version,
+                                            int32* bugfix_version) {
+  base::mac::ScopedNSAutoreleasePool pool;
+  NSString* version = [[UIDevice currentDevice] systemVersion];
+  NSArray* versionInfo = [version componentsSeparatedByString:@"."];

[Mark Mentovai, 2012/07/10 16:10:04]

Use this_style naming.

[Chen Yu, 2012/07/10 17:07:30]

Done.

+  NSUInteger length = [versionInfo count];
+
+  *major_version = [[versionInfo objectAtIndex:0] intValue];
+
+  if (length >= 2)
+    *minor_version = [[versionInfo objectAtIndex:1] intValue];
+  else
+    *minor_version = 0;
+
+  if (length >= 3)
+    *bugfix_version = [[versionInfo 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);
+
+  if (count != HOST_BASIC_INFO_COUNT) {

[Mark Mentovai, 2012/07/10 16:10:04]

I believe I asked you to check result before you checked count, didn’t I?

[Chen Yu, 2012/07/10 17:07:30]

Sorry, I misread your comment; I thought you were suggesting to follow the
patten of result check and was wondering. Changed. Thanks!
On 2012/07/10 16:10:04, Mark Mentovai wrote:

+    NOTREACHED();
+    return 0;
+  }
+
+  if (result != KERN_SUCCESS) {
+    NOTREACHED();
+    return 0;
+  }
+
+  return static_cast<int64>(hostinfo.max_mem);
+}
+
+}  // namespace base