set.mitm: Parse settings from SD card (closes #268)

stratosphere/set_mitm/source/setsys_shim.c

@@ -13,7 +13,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
- 
+
+#include <string.h>
 #include <switch.h>
 #include "setsys_shim.h"
 
@@ -50,3 +51,50 @@ Result setsysGetEdidFwd(Service* s, SetSysEdid* out) {
 
     return rc;
 }
+
+Result setsysGetSettingsItemValueFwd(Service *s, const char *name, const char *item_key, void *value_out, size_t value_out_size, u64 *size_out) {
+    char send_name[SET_MAX_NAME_SIZE];
+    char send_item_key[SET_MAX_NAME_SIZE];
+    
+    memset(send_name, 0, SET_MAX_NAME_SIZE);
+    memset(send_item_key, 0, SET_MAX_NAME_SIZE);
+    strncpy(send_name, name, SET_MAX_NAME_SIZE-1);
+    strncpy(send_item_key, item_key, SET_MAX_NAME_SIZE-1);
+
+    IpcCommand c;
+    ipcInitialize(&c);
+    ipcAddSendStatic(&c, send_name, SET_MAX_NAME_SIZE, 0);
+    ipcAddSendStatic(&c, send_item_key, SET_MAX_NAME_SIZE, 0);
+    ipcAddRecvBuffer(&c, value_out, value_out_size, 0);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+    } *raw;
+
+    raw = serviceIpcPrepareHeader(s, &c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 38;
+
+    Result rc = serviceIpcDispatch(s);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        struct {
+            u64 magic;
+            u64 result;
+            u64 size_out;
+        } *resp;
+
+        serviceIpcParse(s, &r, sizeof(*resp));
+        resp = r.Raw;
+
+        rc = resp->result;
+        if (R_SUCCEEDED(rc)) {
+            *size_out = resp->size_out;
+        }
+    }
+
+    return rc;
+}