src/ElmSharp/Interop/Interop.Libc.cs

   1 /*
   2  * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the License);
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an AS IS BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 using System;
  18 using System.Runtime.InteropServices;
  19
  20 internal static partial class Interop
  21 {
  22     internal static partial class Libc
  23     {
  24         [DllImport(Libraries.Libc, EntryPoint = "free", CallingConvention = CallingConvention.Cdecl)]
  25         internal static extern int Free(IntPtr ptr);
  26
  27         // Broken-down time is stored in the structure tm which is defined in <time.h> as follows:
  28         [StructLayout(LayoutKind.Sequential)]
  29         internal struct SystemTime
  30         {
  31             public int tm_sec;
  32             public int tm_min;
  33             public int tm_hour;
  34             public int tm_mday;
  35             public int tm_mon;
  36             public int tm_year;
  37             public int tm_wday;
  38             public int tm_yday;
  39             public int tm_isdst;
  40
  41             // The glibc version of struct tm has additional fields
  42             public long tm_gmtoff;
  43             public IntPtr tm_zone;
  44
  45             public static implicit operator SystemTime(DateTime value)
  46             {
  47                 SystemTime tm = new SystemTime();
  48                 tm.tm_sec = value.Second;
  49                 tm.tm_min = value.Minute;
  50                 tm.tm_hour = value.Hour;
  51                 tm.tm_mday = value.Day;
  52                 tm.tm_mon = value.Month - 1;
  53                 tm.tm_year = value.Year - 1900;
  54                 tm.tm_wday = (int)value.DayOfWeek;
  55                 tm.tm_yday = value.DayOfYear;
  56                 tm.tm_isdst = value.IsDaylightSavingTime() ? 1 : 0;
  57                 return tm;
  58             }
  59
  60             public static implicit operator DateTime(SystemTime value)
  61             {
  62                 DateTime date = new DateTime(value.tm_year + 1900, value.tm_mon + 1, value.tm_mday, value.tm_hour, value.tm_min, value.tm_sec);
  63                 return date;
  64             }
  65         }
  66     }
  67 }