From 320f17a94fd916ef7d07fb344d2acf09ee534c5d Mon Sep 17 00:00:00 2001
From: Liam Minopulos <stunthacks@gmail.com>
Date: Tue, 26 Feb 2019 22:57:31 +0100
Subject: [PATCH] Implement error applet

---
 nx/include/switch/applets/error.h | 74 ++++++++++++++++++++++++++++++
 nx/source/applets/error.cpp       | 76 +++++++++++++++++++++++++++++++
 2 files changed, 150 insertions(+)
 create mode 100644 nx/include/switch/applets/error.h
 create mode 100644 nx/source/applets/error.cpp

diff --git a/nx/include/switch/applets/error.h b/nx/include/switch/applets/error.h
new file mode 100644
index 00000000..bd169919
--- /dev/null
+++ b/nx/include/switch/applets/error.h
@@ -0,0 +1,74 @@
+/**
+ * @file error.h
+ * @brief Wrapper for using the error LibraryApplet.
+ * @author StuntHacks
+ * @copyright libnx Authors
+ */
+#pragma once
+#include "../types.h"
+#include "../services/applet.h"
+
+/// Error configuration struct.
+typedef struct {
+    u32 major_code;             ///< First part of the error code.
+    u32 minor_code;             ///< Second part of the error code.
+    bool custom_text;           ///< Whether to display a custom error message.
+    char* short_description;    ///< Short description of the error.
+    char* detailed_description; ///< More detailed description of the error. Shown when the user clicks on "Details".
+} ErrorConfig;
+
+/**
+ * @brief Creates an ErrorConfg struct.
+ * @param c ErrorConfg struct.
+ * @note Sets the following fields: majorCode = 2000, minorCode = 0, customText = false, shortDescription = "", detailedDescription = "".
+ */
+void errorCreate(ErrorConfig* c);
+
+/**
+ * @brief Closes an ErrorConfg struct.
+ * @param c ErrorConfg struct.
+ */
+void errorClose(ErrorConfig* c);
+
+/**
+ * @brief Launches with the specified config.
+ * @param c ErrorConfig struct
+ */
+void errorShow(ErrorConfig* c);
+
+/**
+ * @brief Sets the first part of the error code.
+ * @param c    ErrorConfig struct
+ * @param code Code.
+ */
+void errorConfigSetMajorCode(ErrorConfig* c, u32 code);
+
+/**
+ * @brief Sets the second part of the error code.
+ * @param c    ErrorConfig struct
+ * @param code Code.
+ */
+void errorConfigSetMinorCode(ErrorConfig* c, u32 code);
+
+/**
+ * @brief Sets whether to use a custom error message.
+ * @param c          ErrorConfig struct
+ * @param customText Whether to use a custom message.
+ */
+void errorConfigSetCustomText(ErrorConfig* c, bool customText);
+
+/**
+ * @brief Sets the short description.
+ * @param c   ErrorConfig struct
+ * @param str Description.
+ */
+void errorConfigSetShortDescription(ErrorConfig* c, const char* str);
+
+/**
+ * @brief Sets the detailed description.
+ * @param c   ErrorConfig struct
+ * @param str Description.
+ *
+ * This gets displayed when the user clicks on "Details".
+ */
+void errorConfigSetDetailedDescription(ErrorConfig* c, const char* str);
diff --git a/nx/source/applets/error.cpp b/nx/source/applets/error.cpp
new file mode 100644
index 00000000..1bf30f2d
--- /dev/null
+++ b/nx/source/applets/error.cpp
@@ -0,0 +1,76 @@
+#include <malloc.h>
+#include <string.h>
+#include "types.h"
+#include "result.h"
+#include "services/applet.h"
+#include "applets/libapplet.h"
+#include "applets/error.h"
+
+void errorCreate(ErrorConfig* c) {
+    c->major_code = 2000;
+    c->minor_code = 0;
+    c->custom_text = false;
+
+    c->detailed_description = (char*) malloc(sizeof(char) * (strlen("") + 1));
+    strcpy(c->detailed_description, "");
+
+    c->short_description = (char*) malloc(sizeof(char) * (strlen("") + 1));
+    strcpy(c->short_description, "");
+}
+
+void errorClose(ErrorConfig* c) {
+    free(c->short_description);
+    free(c->detailed_description);
+    memset(c, 0, sizeof(ErrorConfig));
+}
+
+void errorShow(ErrorConfig* c) {
+    AppletHolder err;
+    AppletStorage errStor;
+    LibAppletArgs errArgs;
+
+    appletCreateLibraryApplet(&err, AppletId_error, LibAppletMode_AllForeground);
+    libappletArgsCreate(&errArgs, 1);
+    libappletArgsPush(&errArgs, &err);
+
+    appletCreateStorage(&errStor, 4120);
+
+    u8 args[0x1018] = {0};
+    args[0] = (c->custom_text ? 1 : 0);
+
+    *(u64*) &args[8] = c->major_code;
+    *(u64*) &args[0xC] = c->minor_code;
+    strcpy((char*) &args[0x18], c->short_description);
+    strcpy((char*) &args[0x818], c->detailed_description);
+    appletStorageWrite(&errStor, 0, args, 0x1018);
+
+    appletHolderPushInData(&err, &errStor);
+
+    appletHolderStart(&err);
+    appletHolderJoin(&err);
+    appletHolderClose(&err);
+}
+
+void errorConfigSetMajorCode(ErrorConfig* c, u32 code) {
+    c->major_code = code;
+}
+
+void errorConfigSetMinorCode(ErrorConfig* c, u32 code) {
+    c->minor_code = code;
+}
+
+void errorConfigSetCustomText(ErrorConfig* c, bool customText) {
+    c->custom_text = customText;
+}
+
+void errorConfigSetShortDescription(ErrorConfig* c, const char* str) {
+    free(c->short_description);
+    c->short_description = (char*) malloc(sizeof(char) * (strlen(str) + 1));
+    strcpy(c->short_description, str);
+}
+
+void errorConfigSetDetailedDescription(ErrorConfig* c, const char* str) {
+    free(c->detailed_description);
+    c->detailed_description = (char*) malloc(sizeof(char) * (strlen(str) + 1));
+    strcpy(c->detailed_description, str);
+}