Hide the . and .. directories in file device

The file device shows the special directories . and .. in every
directory but the root directory. To hide these, in non-root
directories, we reduce the reported number of child entries by 2, and
when selecting a child entry we increment the pointer by 2.

1 files changed, 7 insertions, 1 deletions

diff --git a/arm9/source/devices/file.c b/arm9/source/devices/file.c
index c9b822c..1b10862 100644
--- a/arm9/source/devices/file.c
+++ b/arm9/source/devices/file.c
@@ -29,6 +29,7 @@ void fs_close(FileDevice *fs) {
     fs->length = 0;
     fs->child = NULL;
     fs->dir_i = 0;
+    fs->at_root = false;
 }
 
 void fs_clear(FileDevice *fs) {
@@ -82,6 +83,8 @@ void fs_open_entry(FileDevice* fs, u8 *path) {
         while ((fs->child = readdir(fs->dir))) {
             fs->dir_i++;
         };
+        // If this is not the root directory, reduce len by 2 for . and .. dirs.
+        if (path[1] == 0) { fs->at_root = true; } else { fs->dir_i -= 2; }
         fs->length = fs->dir_i;
         fs_select_child(fs, 0);
         pb_populate(&fs->path, path);
@@ -113,9 +116,12 @@ void fs_open_entry(FileDevice* fs, u8 *path) {
 }
 
 void fs_select_child(FileDevice *fs, u32 pointer) {
+    // Increment past the . and .. directories.
+    if (!fs->at_root) {
+        pointer += 2;
+    }
     fs->pointer = pointer;
     rewinddir(fs->dir);
-    fs->dir_i = 0;
 
     for (fs->dir_i=0; fs->dir_i<pointer+1; fs->dir_i++) {
         fs->child = readdir(fs->dir);