added functions to load/unload modules

src/module.c

@@ -1,6 +1,10 @@
 #include "stk.h"
 #include <stdlib.h>
 
+void *platform_load_library(const char *path);
+void platform_unload_library(void *handle);
+void *platform_get_symbol(void *handle, const char *symbol);
+
 typedef void (*stk_module_func)(void);
 
 static void **stk_handles = NULL;
@@ -10,3 +14,49 @@ static stk_module_func *stk_shutdowns = NULL;
 static size_t module_count = 0;
 
 size_t stk_module_count(void) { return module_count; }
+
+static int stk_module_load(const char *path)
+{
+	void *handle;
+	stk_module_func init_func;
+	stk_module_func shutdown_func;
+
+	handle = platform_load_library(path);
+	if (!handle)
+		return -1;
+
+	init_func =
+	    (stk_module_func)platform_get_symbol(handle, "stk_module_init");
+	shutdown_func =
+	    (stk_module_func)platform_get_symbol(handle, "stk_module_shutdown");
+
+	if (!init_func || !shutdown_func) {
+		platform_unload_library(handle);
+		return -2;
+	}
+
+	stk_handles[module_count] = handle;
+	stk_inits[module_count] = init_func;
+	stk_shutdowns[module_count] = shutdown_func;
+
+	init_func();
+
+	++module_count;
+	return 0;
+}
+
+static void stk_module_unload(size_t index)
+{
+	size_t i;
+
+	stk_shutdowns[index]();
+	platform_unload_library(stk_handles[index]);
+
+	for (i = index; i < module_count - 1; ++i) {
+		stk_handles[i] = stk_handles[i + 1];
+		stk_inits[i] = stk_inits[i + 1];
+		stk_shutdowns[i] = stk_shutdowns[i + 1];
+	}
+
+	--module_count;
+}