From 422c3c327295094c69a8f65698a08f31a8028dc3 Mon Sep 17 00:00:00 2001
From: Kartik <pokemonemerald0@gmail.com>
Date: Tue, 4 Apr 2017 21:19:37 +0530
Subject: [PATCH] Implement error applet (#343)

---
 libctru/include/3ds.h               |  3 +-
 libctru/include/3ds/applets/error.h | 89 +++++++++++++++++++++++++++++
 libctru/source/applets/error.c      | 54 +++++++++++++++++
 3 files changed, 145 insertions(+), 1 deletion(-)
 create mode 100644 libctru/include/3ds/applets/error.h
 create mode 100644 libctru/source/applets/error.c

diff --git a/libctru/include/3ds.h b/libctru/include/3ds.h
index ebee3d7..fd91d31 100644
--- a/libctru/include/3ds.h
+++ b/libctru/include/3ds.h
@@ -74,7 +74,8 @@ extern "C" {
 #include <3ds/ndsp/channel.h>
 
 #include <3ds/applets/swkbd.h>
-
+#include <3ds/applets/error.h>
+  
 #include <3ds/sdmc.h>
 #include <3ds/romfs.h>
 #include <3ds/font.h>
diff --git a/libctru/include/3ds/applets/error.h b/libctru/include/3ds/applets/error.h
new file mode 100644
index 0000000..e56d901
--- /dev/null
+++ b/libctru/include/3ds/applets/error.h
@@ -0,0 +1,89 @@
+/**
+ * @file error.h
+ * @brief Error applet.
+ */
+#pragma once
+ enum
+{
+	ERROR_LANGUAGE_FLAG = 0x100,    ///<??-Unknown flag
+	ERROR_WORD_WRAP_FLAG = 0x200    ///<??-Unknown flag
+};
+
+
+///< Type of Error applet to be called
+
+typedef enum 
+{
+	ERROR_CODE = 0,						///< Displays the infrastructure communications-related error message corresponding to the error code.
+	ERROR_TEXT,						///< Displays text passed to this applet.
+	ERROR_EULA,						///< Displays the EULA
+	ERROR_TYPE_EULA_FIRST_BOOT,				///< Use prohibited.
+	ERROR_TYPE_EULA_DRAW_ONLY,				///< Use prohibited.
+	ERROR_TYPE_AGREE,					///< Use prohibited.
+	ERROR_CODE_LANGUAGE = ERROR_CODE | ERROR_LANGUAGE_FLAG,	///< Displays a network error message in a specified language.
+	ERROR_TEXT_LANGUAGE = ERROR_TEXT | ERROR_LANGUAGE_FLAG,	///< Displays text passed to this applet in a specified language.
+	ERROR_EULA_LANGUAGE = ERROR_EULA | ERROR_LANGUAGE_FLAG,	///< Displays EULA in a specified language.
+	ERROR_TEXT_WORD_WRAP = ERROR_TEXT | ERROR_WORD_WRAP_FLAG,///< Displays the custom error message passed to this applet with automatic line wrapping
+	ERROR_TEXT_LANGUAGE_WORD_WRAP = ERROR_TEXT | ERROR_LANGUAGE_FLAG | ERROR_WORD_WRAP_FLAG	///< Displays the custom error message with automatic line wrapping and in the specified language.
+}errorType;
+
+///< Flags for the Upper Screen.Does nothing even if specified.
+
+typedef enum
+{
+	ERROR_NORMAL = 0,    
+	ERROR_STEREO
+}errorScreenFlag;
+
+///< Return code of the Error module.Use UNKNOWN for simple apps.
+
+typedef enum 
+{
+	ERROR_UNKNOWN = -1,       
+	ERROR_NONE    = 0,        
+	ERROR_SUCCESS,            
+	ERROR_NOT_SUPPORTED,      
+	ERROR_HOME_BUTTON = 10,   
+	ERROR_SOFTWARE_RESET,     
+	ERROR_POWER_BUTTON     
+}errorReturnCode;
+
+///< Structure to be passed to the applet.Shouldn't be modified directly.
+
+typedef struct 
+{
+	errorType errorType;
+	int errorCode;
+	errorScreenFlag upperScreenFlag;
+	u16 useLanguage;
+	u16 Text[1900];
+	bool homeButton;
+	bool softwareReset;
+	bool appJump;
+	errorReturnCode returnCode;
+	u16 eulaVersion;
+}errorConf;
+/**
+* @brief Init the error applet.
+* @param err Pointer to errorConf.
+* @param type errorType Type of error.
+* @param lang CFG_Language Lang of error. 
+*/
+void errorInit(errorConf* err, errorType type, CFG_Language lang);
+/**
+* @brief Sets error code to display.
+* @param err Pointer to errorConf.
+* @param error Error-code to display.
+*/
+void errorCode(errorConf* err, int error);
+/**
+* @brief Sets error text to display.
+* @param err Pointer to errorConf.
+* @param text Error-text to display.
+*/
+void errorText(errorConf* err, const char* text);
+/**
+* @brief Displays the error applet.
+* @param err Pointer to errorConf.
+*/
+void errorDisp(errorConf* err);
diff --git a/libctru/source/applets/error.c b/libctru/source/applets/error.c
new file mode 100644
index 0000000..cd9a609
--- /dev/null
+++ b/libctru/source/applets/error.c
@@ -0,0 +1,54 @@
+#include <3ds.h>
+#include <string.h>
+#include <3ds/types.h>
+#include <3ds/synchronization.h>
+#include <3ds/services/apt.h>
+#include <3ds/services/cfgu.h>
+#include <3ds/util/utf.h>
+#include <3ds/applets/error.h>
+
+void errorInit(errorConf* err, errorType type, CFG_Language lang)
+{
+	memset(err, 0, sizeof(*err));
+	err->errorType = type;
+	err->useLanguage = lang;
+	err->upperScreenFlag = ERROR_NORMAL;
+	err->eulaVersion =  0;
+	err->homeButton = true;
+	err->softwareReset = false;
+	err->appJump = false;
+	err->returnCode = ERROR_UNKNOWN;
+}
+
+void errorCode(errorConf* err, int error)
+{
+	err->errorCode = error;
+}
+
+static void errorConvertToUTF16(u16* out, const char* in, size_t max)
+{
+	if (!in || !*in)
+	{
+		out[0] = 0;
+		return;
+	}
+
+	ssize_t units = utf8_to_utf16(out, (const uint8_t*)in, max-1);
+	if (units < 0)
+	{
+		out[0] = 0;
+		return;
+	}
+
+	out[units] = 0;	
+}
+
+void errorText(errorConf *err, const char* text)
+{
+	errorConvertToUTF16(err->Text, text, 1900);
+}
+
+void errorDisp(errorConf* err)
+{   
+	aptLaunchLibraryApplet(APPID_ERROR, err, sizeof(*err), 0);
+}