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! Copyright (c) 2020 Jeffrey Armstrong <jeff@rainbow-100.com>
!
! Permission is hereby granted, free of charge, to any person obtaining a copy
! of this software and associated documentation files (the "Software"), to deal
! in the Software without restriction, including without limitation the rights
! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! copies of the Software, and to permit persons to whom the Software is
! furnished to do so, subject to the following conditions:
!
! The above copyright notice and this permission notice shall be included in
! all copies or substantial portions of the Software.
!
! The Software shall be used for Good, not Evil.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.

module wsa_network
use iso_c_binding
implicit none

    integer, parameter::wsa_description_length_plus_1 = 256

    type, bind(c) :: wsadata
        integer(kind=c_int16_t)::wVersion
        integer(kind=c_int16_t)::wHighVersion
        integer(kind=c_short)::iMaxSockets
        integer(kind=c_short)::iMaxUdpDg
        
        type(c_ptr)::lpVendorInfo
        character(len=1, kind=c_char), dimension(wsa_description_length_plus_1)::szDescription
        character(len=1, kind=c_char), dimension(wsa_description_length_plus_1)::szSystemStatus
    end type
    
contains

    subroutine startup()
    use iso_c_binding
    implicit none
    
        interface
            function wsa_startup(v, p) bind(c, name="WSAStartup")
            use iso_c_binding
            integer(kind=c_int16_t), value::v
            type(c_ptr), value::p
            integer(kind=c_int)::wsa_startup
            end function wsa_startup
        end interface
        
        type(wsadata), target::startup_data
        integer::res
        
        ! need to use wVersionRequested = MAKEWORD(2, 2);
        
        
        res = wsa_startup(int(z'0202', kind=c_int16_t), c_loc(startup_data))
        if(res /= 0) then
            Print *, "Windows Networking failed to start"
            Print *, "Error=", res
            stop
        end if
    end subroutine startup
end module wsa_network