1 files changed, 46 insertions, 0 deletions
diff --git a/arm9/lib/include/FSi_util.h b/arm9/lib/include/FSi_util.h
new file mode 100644
index 00000000..6e96681e
--- /dev/null
+++ b/arm9/lib/include/FSi_util.h
@@ -0,0 +1,46 @@
+#ifndef NITRO_FSI_UTIL_H_
+#define NITRO_FSI_UTIL_H_
+
+#define ALIGN_MASK(a) ((u32)((a) - 1))
+
+#define ALIGN_BYTE(n, a) (((u32)(n) + ALIGN_MASK(a)) & ~ALIGN_MASK(a))
+
+#define BIT_MASK(a) ((u32)((1 << (a)) - 1))
+
+static inline BOOL FSi_IsSlash(u32 c)
+{
+    return (c == '/') || (c == '\\');
+}
+
+static inline void FSi_CutFromListCore(FSFileLink *trg)
+{
+    FSFile *const pr = trg->prev;
+    FSFile *const nx = trg->next;
+    if (pr)
+        pr->link.next = nx;
+    if (nx)
+        nx->link.prev = pr;
+}
+
+static inline void FSi_CutFromList(FSFile *elem)
+{
+    FSFileLink *const trg = &elem->link;
+    FSi_CutFromListCore(trg);
+    trg->next = trg->prev = NULL;
+}
+
+static inline void FSi_AppendToList(FSFile *elem, FSFile *list)
+{
+    FSFileLink *const trg = &elem->link;
+    FSi_CutFromListCore(trg);
+    {
+        while (list->link.next)
+            list = list->link.next;
+        list->link.next = elem;
+        trg->prev = list;
+        trg->next = NULL;
+    }
+}
+
+
+#endif //NITRO_FSI_UTIL_H_