build: add module to handle querying platform details

CMakeLists.txt

@@ -1,12 +1,14 @@
 cmake_minimum_required(VERSION 3.25)
 project(fx C ASM)
 
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}/cmake)
 include (TestBigEndian)
+include(Templates)
+include(Platform)
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_EXTENSIONS OFF)
 
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}/cmake)
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
 set(fx_source_root ${CMAKE_CURRENT_SOURCE_DIR})
@@ -33,10 +35,9 @@ endif ()
 
 message(STATUS "Floating point support: ${fx_enable_floating_point}")
 
-set(fx_system_name ${CMAKE_SYSTEM_NAME})
-string(TOLOWER ${fx_system_name} fx_system_name)
-set(fx_system_arch ${CMAKE_SYSTEM_PROCESSOR})
-string(TOLOWER ${fx_system_arch} fx_system_arch)
+get_platform_details(
+	SYSTEM fx_system_name
+	PROCESSOR fx_system_arch)
 
 message(STATUS "Target system: ${fx_system_name}-${fx_system_arch}")
 
@@ -44,8 +45,6 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin)
 
-include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/Templates.cmake)
-
 foreach (assembly ${fx_assemblies})
 	add_subdirectory(assemblies/${assembly})
 endforeach (assembly)

cmake/Platform.cmake

@@ -0,0 +1,36 @@
+function(get_platform_details)
+	set(options)
+	set(one_value_args SYSTEM PROCESSOR)
+	set(multi_value_args
+		NAMESPACES
+		DEPENDENCIES
+		LIBS)
+	cmake_parse_arguments(PARSE_ARGV 0 arg
+		"${options}"
+		"${one_value_args}"
+		"${multi_value_args}")
+
+	set(system_name "")
+
+	if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
+		set(system_name "linux")
+	elseif ("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
+		set(system_name "apple")
+	elseif ("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
+		set(system_name "win32")
+	else ()
+		message(FATAL_ERROR "Unsupported platform: ${CMAKE_SYSTEM_NAME}")
+	endif ()
+
+	if ("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
+		set(system_arch "amd64")
+	elseif ("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "arm64")
+		set(system_arch "aarch64")
+	else ()
+		message(FATAL_ERROR "Unsupported architecture: ${CMAKE_SYSTEM_PROCESSOR}")
+	endif ()
+
+	set(${arg_SYSTEM} ${system_name} PARENT_SCOPE)
+	set(${arg_PROCESSOR} ${system_arch} PARENT_SCOPE)
+endfunction (get_platform_details)
+

fx/vector.c

@@ -73,7 +73,7 @@ static int trim_excess_items(
 {
 	size_t to_trim = v->v_count - new_capacity;
 	size_t start = new_capacity;
-	char *item = &v->v_buf[start];
+	char *item = (char *)v->v_buf + start;
 
 	for (size_t i = start; i < v->v_count; i++) {
 		ops->v_destroy(item);