cmake_minimum_required(VERSION 3.1)

project(FileSender)

include(CheckFunctionExists)
include(CheckIncludeFiles)
include(CheckLibraryExists)
include(CheckStructHasMember)

macro(CX_SEARCH_LIBS func)
  string(TOUPPER ${func} _FUNC)
  check_function_exists(${func} HAVE_${_FUNC})
  if(NOT HAVE_${_FUNC})
    foreach(lib ${ARGN})
      unset(HAVE_${_FUNC} CACHE)
      check_library_exists(${lib} ${func} "" HAVE_${_FUNC})
      if(HAVE_${_FUNC})
        set("${_FUNC}_LIB" "${lib}" CACHE INTERNAL "Library providing `${func}'")
        break()
      endif()
    endforeach()
  endif()
  if(HAVE_${_FUNC})
    add_compile_definitions("HAVE_${_FUNC}")
  endif()
endmacro()

macro(CX_CHECK_HEADERS)
  foreach(h ${ARGN})
    string(TOUPPER ${h} _HDR)
    string(REGEX REPLACE "[/.-]" "_" _HDR ${_HDR})
    check_include_files(${h} HAVE_${_HDR})
    if(HAVE_${_HDR})
      add_compile_definitions("HAVE_${_HDR}")
    endif()
  endforeach()
endmacro()

macro(CX_CHECK_MEMBERS _members)
  foreach(s ${_members})
    string(STRIP "${s}" s)
    string(REGEX REPLACE "[ \t]+" " " s ${s})
    string(REGEX REPLACE "([^.]+)\.([^.]+)$" "\\1" struct ${s})
    string(REGEX REPLACE "([^.]+)\.([^.]+)$" "\\2" field ${s})
    string(REGEX REPLACE "[ .]" "_" M ${s})
    string(TOUPPER "HAVE_${M}" HAVE)
    check_struct_has_member("${struct}" "${field}" "${ARGN}" ${HAVE})
    if(${HAVE})
      add_compile_definitions(${HAVE})
    endif()
  endforeach()
endmacro()

cx_check_headers(fcntl.h netinet/in.h stddef.h stdlib.h string.h sys/socket.h unistd.h sys/sendfile.h)

cx_search_libs(sendfile sendfile)
cx_search_libs(socket socket)

cx_check_members("struct sf_hdtr.hdr_cnt" sys/socket.h)

add_executable(server server.c utils.c utils.h)
target_link_libraries(server ${SOCKET_LIB})

add_executable(client client.c utils.c utils.h)
target_link_libraries(client ${SOCKET_LIB} ${SENDFILE_LIB})