###############################################################################
#
#  Copyright (c) 2022 Contributors to the Eclipse Foundation
#
#  See the LICENSE file(s) distributed with this work for additional
#  information regarding copyright ownership.
#
#  This program and the accompanying materials are made available under the
#  terms of the Eclipse Public License 1.0
#  which is available at https://www.eclipse.org/legal/epl-v10.html
#  and the Eclipse Distribution License v. 1.0
#  available at http://www.eclipse.org/org/documents/edl-v10.php
#
#  SPDX-License-Identifier: EPL-1.0
#
#  Contributors:
#     Jimmy Björklund  - initial version
#     Achim Kraus      - add getrandom and libcunit
#                        additional minor fixes
#
###############################################################################

include(CheckIncludeFile)
include(CheckFunctionExists)
include(CheckLibraryExists)
include(TestBigEndian)
include(CheckCSourceCompiles)
include(CheckStructHasMember)

check_include_file(assert.h     HAVE_ASSERT_H)
check_include_file(arpa/inet.h  HAVE_ARPA_INET_H)
check_include_file(fcntl.h      HAVE_FCNTL_H)
check_include_file(inttypes.h   HAVE_INTTYPES_H)
check_include_file(memory.h     HAVE_MEMORY_H)
check_include_file(netdb.h      HAVE_NETDB_H)
check_include_file(netinet/in.h HAVE_NETINET_IN_H)
check_include_file(stddef.h     HAVE_STDDEF_H)
check_include_file(stdint.h     HAVE_STDINT_H)
check_include_file(stdlib.h     HAVE_STDLIB_H)
check_include_file(string.h     HAVE_STRING_H)
check_include_file(strings.h    HAVE_STRINGS_H)
check_include_file(time.h       HAVE_TIME_H)
check_include_file(sys/param.h  HAVE_SYS_PARAM_H)
check_include_file(sys/random.h HAVE_SYS_RANDOM_H)
check_include_file(sys/socket.h HAVE_SYS_SOCKET_H)
check_include_file(sys/stat.h   HAVE_SYS_STAT_H)
check_include_file(sys/types.h  HAVE_SYS_TYPES_H)
check_include_file(unistd.h     HAVE_UNISTD_H)
check_include_file(float.h      HAVE_FLOAT_H)
check_include_file(dlfcn.h      HAVE_DLFCN_H)

if(NOT ZEPHYR_BASE)
   # zephyr/ncs 1.9.1 has issues including this header
   check_include_file(sys/time.h   HAVE_SYS_TIME_H)
endif()

if(ZEPHYR_BASE)
   # zephyr/ncs 1.9.1 has issues with check_include_file
   # https://github.com/zephyrproject-rtos/zephyr/issues/31193
   # zephyr/ncs 1.9.1 has net/socket.h instead of sys/socket.h
   set(HAVE_NET_SOCKET_H 1)
endif()

check_function_exists (memset         HAVE_MEMSET)
check_function_exists (select         HAVE_SELECT)
check_function_exists (socket         HAVE_SOCKET)
check_function_exists (strdup         HAVE_STRDUP)
check_function_exists (strerror       HAVE_STRERROR)
check_function_exists (strnlen        HAVE_STRNLEN)
check_function_exists (fls            HAVE_FLS)
check_function_exists (vprintf        HAVE_VPRINTF)
check_function_exists (inet_ntop      HAVE_INET_NTOP)
check_function_exists (random      HAVE_RANDOM)

if(HAVE_SYS_RANDOM_H)
   # zephyr/ncs 1.9.1 seems to link getrandom but doesn't offer a header
   check_function_exists (getrandom      HAVE_GETRANDOM)
endif()

if( ${make_tests} )
   if(BUILD_SHARED_LIBS)
     check_library_exists (libcunit.so CU_initialize_registry "" HAVE_LIBCUNIT)
   else()
     # this link options only intended to be used for the cunit tests
     set(CMAKE_REQUIRED_LINK_OPTIONS -no-pie)
     check_library_exists (libcunit.a CU_initialize_registry "" HAVE_LIBCUNIT)
   endif()
endif()

if( "${HAVE_STRING_H}" AND "${HAVE_STRINGS_H}" AND
    "${HAVE_FLOAT_H}" AND "${HAVE_STDLIB_H}" AND
    "${HAVE_STDDEF_H}" AND "${HAVE_STDINT_H}" AND
    "${HAVE_INTTYPES_H}" AND "${HAVE_DLFCN_H}" )
    set( STDC_HEADERS 1)
endif()

check_struct_has_member ("struct sockaddr_in6" sin6_len "netinet/in.h" HAVE_SOCKADDR_IN6_SIN6_LEN)

TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
if(IS_BIG_ENDIAN)
  set(WORDS_BIGENDIAN 1)
endif()