From 2262259984ef39bd48f1e839fec3d25f509dca2f Mon Sep 17 00:00:00 2001
From: yellows8 <yellows8@users.noreply.github.com>
Date: Sat, 13 Jul 2019 18:57:37 -0400
Subject: [PATCH] Added appletGetDisplayVersion.

---
 nx/include/switch/services/applet.h |  7 +++++
 nx/source/services/applet.c         | 43 +++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/nx/include/switch/services/applet.h b/nx/include/switch/services/applet.h
index 0ff1b3b5..4165094a 100644
--- a/nx/include/switch/services/applet.h
+++ b/nx/include/switch/services/applet.h
@@ -208,6 +208,13 @@ Result appletGetDesiredLanguage(u64 *LanguageCode);
 /// Only available with AppletType_*Application.
 Result appletSetTerminateResult(Result res);
 
+/**
+ * @brief Gets the DisplayVersion for the current host title control.nacp.
+ * @note Only available with AppletType_*Application.
+ * @param[out] displayVersion Output DisplayVersion string, must be at least 0x10-bytes. This is always NUL-terminated.
+ */
+Result appletGetDisplayVersion(char *displayVersion);
+
 /// Set media playback state.
 /// If state is set to true, screen dimming and auto sleep is disabled.
 /// For *Application, this uses cmd SetMediaPlaybackStateForApplication, otherwise cmd SetMediaPlaybackState is used.
diff --git a/nx/source/services/applet.c b/nx/source/services/applet.c
index 4534cef4..5503d255 100644
--- a/nx/source/services/applet.c
+++ b/nx/source/services/applet.c
@@ -1319,6 +1319,49 @@ Result appletSetTerminateResult(Result res) {
     return rc;
 }
 
+Result appletGetDisplayVersion(char *displayVersion) {
+    IpcCommand c;
+    ipcInitialize(&c);
+
+    if (displayVersion) memset(displayVersion, 0, 0x10);
+
+    if (!serviceIsActive(&g_appletSrv) || !_appletIsApplication())
+        return MAKERESULT(Module_Libnx, LibnxError_NotInitialized);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+    } *raw;
+
+    raw = serviceIpcPrepareHeader(&g_appletIFunctions, &c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 23;
+
+    Result rc = serviceIpcDispatch(&g_appletIFunctions);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        struct {
+            u64 magic;
+            u64 result;
+            char displayVersion[0x10];
+        } *resp;
+
+        serviceIpcParse(&g_appletIFunctions, &r, sizeof(*resp));
+        resp = r.Raw;
+
+        rc = resp->result;
+
+        if (R_SUCCEEDED(rc) && displayVersion) {
+            strncpy(displayVersion, resp->displayVersion, 0x10);
+            displayVersion[0xf] = 0;
+        }
+    }
+
+    return rc;
+}
+
 Result appletSetMediaPlaybackState(bool state) {
     if (!serviceIsActive(&g_appletSrv))
         return MAKERESULT(Module_Libnx, LibnxError_NotInitialized);