validate global_settings.start_directory on startup check for an ending slash and verify paths other than root exist

commit 9a6e3799e18ba1e365cb23f6a2a5044e49cecffc
Author: William Wilgus <[email protected]>
Date:   Wed Feb 25 00:47:30 2026 -0500

    validate global_settings.start_directory on startup
    check for an ending slash and verify paths other than root
    exist
    
    Change-Id: I4e1b3d51d99e5f5b66bcc0d66866ae35a554f84d

diff --git a/apps/main.c b/apps/main.c
index 009f2e96ac..510bcdfc34 100644
--- a/apps/main.c
+++ b/apps/main.c
@@ -241,6 +241,7 @@ int main(void)
 #endif /* #ifdef AUTOROCK */
 
     global_status.last_volume_change = 0;
+    validate_start_directory_init();
     /* no calls INIT_ATTR functions after this point anymore!
      * see definition of INIT_ATTR in config.h */
     CHART(">root_menu");
diff --git a/apps/misc.c b/apps/misc.c
index 05f1fa6a93..b9a33d8665 100644
--- a/apps/misc.c
+++ b/apps/misc.c
@@ -2018,4 +2018,27 @@ void clear_screen_buffer(bool update)
     }
 }
 
+void validate_start_directory_init(void) /* INIT_ATTR */
+{
+    char * const dirpath = global_settings.start_directory;
+    char *slash = strrchr(dirpath, PATH_SEPCH);
+
+    if (!slash)
+    {
+        path_append(dirpath, PATH_ROOTSTR, PA_SEP_HARD,
+                    sizeof(global_settings.start_directory));
+        return; /* if this doesn't exist we have bigger issues */
+    }
+    else if(slash[1] != '\0') /* ending slash required */
+    {
+        path_append(dirpath, dirpath, PA_SEP_HARD,
+                    sizeof(global_settings.start_directory));
+    }
+    if (slash != dirpath && !dir_exists(dirpath))
+    {
+        path_append(dirpath, PATH_ROOTSTR,
+            PA_SEP_HARD, sizeof(global_settings.start_directory));
+    }
+}
+
 #endif /* ndef __PCTOOL__ */
diff --git a/apps/misc.h b/apps/misc.h
index fd326c5a7d..c4aa718c4a 100644
--- a/apps/misc.h
+++ b/apps/misc.h
@@ -128,7 +128,7 @@ long default_event_handler_ex(long event, void (*callback)(void *), void *parame
 long default_event_handler(long event);
 bool list_stop_handler(void);
 void car_adapter_mode_init(void) INIT_ATTR;
-
+void validate_start_directory_init(void) INIT_ATTR;
 /* Unicode byte order mark sequences and lengths */
 #define BOM_UTF_8 "\xef\xbb\xbf"
 #define BOM_UTF_8_SIZE 3
-- 
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