Add globals.c file

Declarations of the externs in the header
globals_init() function for getting the hw.so handler and the
gp_engine and gp_client symbol pointers

src/globals.c

@@ -0,0 +1,31 @@
+
+#include <stdio.h>
+#include <dlfcn.h>
+
+#include "include/globals.h"
+#include "include/sdk.h"
+
+void* hw;
+DECLARE_SYMBOLS(cl_enginefunc_t, engine);
+DECLARE_SYMBOLS(cl_clientfunc_t, client);
+
+bool globals_init(void) {
+    /*
+     * Get handler for hw.so
+     *  RTLD_LAZY: If the symbol is never referenced, then it is never resolved.
+     *  RTLD_NOLOAD: Don't load the shared object.
+     */
+    hw = dlopen("hw.so", RTLD_LAZY | RTLD_NOLOAD);
+
+    /* Make sure it's a valid handler */
+    if (!hw) {
+        printf("hl-cheats: globals_init: can't open hw.so\n");
+        return false;
+    }
+
+    /* Get symbol addresses using dlsym and the handler we just opened */
+    gp_engine = (cl_enginefunc_t*)dlsym(hw, "cl_enginefuncs");
+    gp_client = (cl_clientfunc_t*)dlsym(hw, "cl_funcs");
+
+    return true;
+}