Add logging to Wii

src/duskdolphin/log/log.c

@@ -1,6 +1,6 @@
 /**
  * Copyright (c) 2026 Dominic Masters
- * 
+ *
  * This software is released under the MIT License.
  * https://opensource.org/licenses/MIT
  */
@@ -8,19 +8,66 @@
 #include "log/log.h"
 #include "display/display.h"
 #include <debug.h>
+#include <fat.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define LOG_DEBUG_PATH "/apps/Dusk/debug.log"
+#define LOG_ERROR_PATH "/apps/Dusk/error.log"
+
+static bool_t fatTried = false;
+static bool_t fatReady = false;
+
+static void logInitFAT(void) {
+  if(fatTried) return;
+  fatTried = true;
+  fatReady = fatInitDefault();
+}
 
 void logDebug(const char_t *message, ...) {
-  // Print to stdout
   va_list args;
   va_start(args, message);
-  vfprintf(stdout, message, args);
-  va_end(args);
+
+  // Print to stdout
+  va_list copy;
+  va_copy(copy, args);
+  vfprintf(stdout, message, copy);
+  va_end(copy);
   fflush(stdout);
+
+  // Print to file
+  logInitFAT();
+  if(fatReady) {
+    FILE *file = fopen(LOG_DEBUG_PATH, "a");
+    if(file) {
+      va_copy(copy, args);
+      vfprintf(file, message, copy);
+      va_end(copy);
+      fclose(file);
+    }
+  }
+
+  va_end(args);
 }
 
 void logError(const char_t *message, ...) {
+  va_list args;
+  va_start(args, message);
+
+  // Write to file before displaying on screen
+  logInitFAT();
+  if(fatReady) {
+    FILE *file = fopen(LOG_ERROR_PATH, "a");
+    if(file) {
+      va_list copy;
+      va_copy(copy, args);
+      vfprintf(file, message, copy);
+      va_end(copy);
+      fclose(file);
+    }
+  }
+
   // Either create graphics, or hijack the displays' graphics.
-  void *xfb = NULL;
   GXRModeObj *rmode = NULL;
   void *framebuffer;
 
@@ -54,12 +101,24 @@ void logError(const char_t *message, ...) {
   }
 
   // Printf
-  va_list args;
-  va_start(args, message);
-  vprintf(message, args);
+  va_list copy;
+  va_copy(copy, args);
+  vprintf(message, copy);
+  va_end(copy);
   va_end(args);
-  
+
+  // PAD_Init is idempotent — safe to call even if inputInit already called it,
+  // and handles the case where the error occurred before inputInit ran.
+  PAD_Init();
   while(SYS_MainLoop()) {
+    PAD_ScanPads();
+    // START button matches the RAGEQUIT bind — allows exit on GC controller
+    // when there is no Wiimote HOME button available.
+    if(PAD_ButtonsDown(0) & PAD_BUTTON_START) break;
     VIDEO_WaitVSync();
   }
+
+  // Exit cleanly to HBC regardless of engine state. engineDispose() is not
+  // called here because the engine may be partially initialized.
+  exit(0);
 }