Casio fx-CG50 Lock Extension

main.c

#include <fxcg/keyboard.h>
#include <fxcg/system.h>
#include <fxcg/display.h>
#include <fxcg/app.h>
#include <string.h>

static void getString(int n, char *buffer, int x, int y) {
    // Set first character to \0, also represented as "" (empty string)
    buffer[0] = '\0';
    int start = 0;
    int cursor = 0;
    
    int col = 0x04;
    int row = 0x09;
    
    unsigned short key;
    while (1) {
//         GetKey(&key);
        Bdisp_PutDisp_DD();
        GetKeyWait_OS(&col, &row, 0, 0, 1, &key);
        
        if (key == KEY_CTRL_EXIT || key == KEY_CTRL_EXE) {
            break;
        }
        
        if (key && key < 30000) {
            cursor = EditMBStringChar((unsigned char*)buffer, n, cursor, key);
            if (cursor == 1)
                DisplayMBString((unsigned char*)"*", start, cursor, x, y);
            else if (cursor == 2)
                DisplayMBString((unsigned char*)"**", start, cursor, x, y);
            else if (cursor == 3)
                DisplayMBString((unsigned char*)"***", start, cursor, x, y);
            else if (cursor == 4)
                DisplayMBString((unsigned char*)"****", start, cursor, x, y);
            else if (cursor == 5)
                DisplayMBString((unsigned char*)"*****", start, cursor, x, y);
            else
                DisplayMBString((unsigned char*)"******", start, cursor, x, y);
        } else {
            int keycode = (int)key;
            EditMBStringCtrl((unsigned char*)buffer, n, &start, &cursor, &keycode, x, y);
        }
    }
}

void timerHandler(void) {
    Keyboard_PutKeycode(0x04, 0x09, 0);
}

void main(void) {
    Bdisp_EnableColor(0);
    Bkey_SetAllFlags(0x80);
    char buf[1024];
    
    while (1) {
        // Clear screen
        Bdisp_AllClr_VRAM();
        
        // Disable menu return	 
		SetGetkeyToMainFunctionReturnFlag(0); 
        
        // Turn off
        PowerOff(1);
        
        // When on, print "Enter password: "
        PrintXY(1, 1, "  Enter password:", 0, 0);
        
        // Search through user info
        char* flagpointer = (char*) 0x80BE0000;
        int counter = 0;
        while (*flagpointer == 0x0F) {
            flagpointer = flagpointer + 0x40;
            counter++;
        }
        
        // Set password from latest info
        char* password;
        if (!counter) {
            continue;
        } else {
            flagpointer = flagpointer - 0x40;
            if(*(flagpointer+0x2C) != '\0') {
                password = (flagpointer+0x2C);
            } else {
                continue;
            }
        }
        
        // Get password entered
        getString(1024, buf, 1, 2);
        
        // If correct password
//         if (strcmp(buf, password) == 0) {
        int key;
        // Start timer to run MENU
        Timer_Install(6, (void*)&timerHandler, 1);
        Timer_Start(6);
        
        // Run getkey
        GetKey(&key);
        
        // Stop timer
        Timer_Deinstall(6);
//         }
    }
    
    return;
}