Option to constrain get_next_dir() to directories below global_settings.start_directory.

When enabled, if the user has set "Start File Browser Here" (config.cfg:
start directory) to anything other than root and "Auto-Change Directory"
is set to "Yes" or "Random", the directory returned when an auto change
is required will be constrained to the value of "start directory" or below.

Change-Id: Iaab773868c4cab5a54f6ae67bdb22e84642a9e4b
Reviewed-on: http://gerrit.rockbox.org/182
Reviewed-by: Nick Peskett <rockbox@peskett.co.uk>
Tested-by: Nick Peskett <rockbox@peskett.co.uk>

1 files changed, 9 insertions, 2 deletions

diff --git a/apps/plugins/random_folder_advance_config.c b/apps/plugins/random_folder_advance_config.c
index f459aa0776..7f6018df4e 100644
--- a/apps/plugins/random_folder_advance_config.c
+++ b/apps/plugins/random_folder_advance_config.c
@@ -65,8 +65,15 @@ static void traversedir(char* location, char* name)
     bool check = false;
     int i;
 
-    rb->snprintf(fullpath, sizeof(fullpath), "%s/%s", location, name);
-    dir = rb->opendir(fullpath);
+    /* behave differently if we're at root to avoid
+       duplication of the initial slash later on */
+    if (location[0] == '\0' && name[0] == '\0') {
+        rb->strcpy(fullpath, "");
+        dir = rb->opendir("/");
+    } else {
+        rb->snprintf(fullpath, sizeof(fullpath), "%s/%s", location, name);
+        dir = rb->opendir(fullpath);
+    }
     if (dir) {
         entry = rb->readdir(dir);
         while (entry) {