From a3f749ca5b86e6a27c1ad36f1b54febad3befe63 Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Wed, 9 Nov 2022 21:25:48 +0200
Subject: Use autotools-like macros with CMake

---
 CMakeLists.txt | 60 ++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 39 insertions(+), 21 deletions(-)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62ad616..c08467d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,4 @@
 cmake_minimum_required(VERSION 3.1)
-cmake_policy(SET CMP0054 NEW)
 
 project(FileSender)
 
@@ -8,37 +7,56 @@ include(CheckIncludeFiles)
 include(CheckLibraryExists)
 include(CheckStructHasMember)
 
-macro(CMAKE_SEARCH_LIBS v_func v_lib func)
-  check_function_exists(${func} ${v_func})
-  if(NOT ${v_func})
+macro(CX_SEARCH_LIBS func)
+  string(TOUPPER ${func} _FUNC)
+  check_function_exists(${func} HAVE_${_FUNC})
+  if(NOT HAVE_${_FUNC})
     foreach(lib ${ARGN})
-      check_library_exists(${lib} ${func} "" HAVE_${func}_IN_${lib})
-      if(HAVE_${func}_IN_${lib})
-        set(${v_func} TRUE)
-        set(${v_lib} "${lib}" CACHE INTERNAL "Library providing ${func}")
+      unset(HAVE_${_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()
 
-check_include_files(sys/sendfile.h HAVE_SYS_SENDFILE_H)
-if(HAVE_SYS_SENDFILE_H)
-  add_compile_definitions(HAVE_SYS_SENDFILE_H)
-endif()
+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()
 
-cmake_search_libs(HAVE_SENDFILE SENDFILE_LIB sendfile sendfile)
-cmake_search_libs(HAVE_SOCKET SOCKET_LIB socket socket)
+cx_check_headers(fcntl.h netinet/in.h stddef.h stdlib.h string.h sys/socket.h unistd.h sys/sendfile.h)
 
-if(HAVE_SENDFILE)
-  add_compile_definitions(HAVE_SENDFILE)
-endif()
+cx_search_libs(sendfile sendfile)
+cx_search_libs(socket socket)
 
-check_struct_has_member("struct sf_hdtr" hdr_cnt sys/socket.h HAVE_STRUCT_SF_HDTR_HDR_CNT)
-if(HAVE_STRUCT_SF_HDTR_HDR_CNT)
-  add_compile_definitions(HAVE_STRUCT_SF_HDTR_HDR_CNT)
-endif()
+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})
-- 
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