vigem-sdvxio: Add relative mode and address comments

src/main/vigemstub/Module.mk

@@ -5,6 +5,7 @@ cppflags_vigemstub  := \
     -I src/imports \
 
 libs_vigemstub  := \
+    util \
  
 src_vigemstub   := \
     helper.c \

src/main/vigemstub/helper.c

@@ -4,6 +4,7 @@
 
 #include "ViGEm/Client.h"
 
+#include "util/log.h"
 #include "vigemstub/helper.h"
 
 PVIGEM_CLIENT vigem_helper_setup(void)
@@ -11,14 +12,14 @@ PVIGEM_CLIENT vigem_helper_setup(void)
     PVIGEM_CLIENT client = vigem_alloc();
 
     if (client == NULL) {
-        printf("vigem_alloc failed\n");
+        log_warning("vigem_alloc failed\n");
         return NULL;
     }
 
     VIGEM_ERROR retval = vigem_connect(client);
 
     if (!VIGEM_SUCCESS(retval)) {
-        printf("ViGEm Bus connection failed with error code: 0x%x\n", retval);
+        log_warning("ViGEm Bus connection failed with error code: 0x%x\n", retval);
         return NULL;
     }
 
@@ -30,14 +31,14 @@ PVIGEM_TARGET vigem_helper_add_pad(PVIGEM_CLIENT client)
     PVIGEM_TARGET pad = vigem_target_x360_alloc();
 
     if (pad == NULL) {
-        printf("vigem_target_x360_alloc failed\n");
+        log_warning("vigem_target_x360_alloc failed\n");
         return NULL;
     }
 
     VIGEM_ERROR pir = vigem_target_add(client, pad);
 
     if (!VIGEM_SUCCESS(pir)) {
-        printf("Target plugin failed with error code: 0x%x\n", pir);
+        log_warning("Target plugin failed with error code: 0x%x\n", pir);
         return NULL;
     }