writing to any line on the disk

Examples/TestingDISK

@@ -1,7 +1,20 @@
+//Adding 0xF6 to register 0
+//0xF6 is the instruction to Write to disk
 ADD 0xFFF6 0XFF00 0x0000
 
+//Debug: printing value in register 9
 PRNT 0x0000 0x0000 0x0000
 
-WBUS 0xff0A 0xff00 0x0000
+//Writing the instruction 0xF6 (stored in register 0) to the bus
+//Writing the data that will be written: 0x0A
+//writing the address (line) in which the data will be written: 0x01 (line 2)
+//Remember, the first line is 0
+WBUS 0xff0A 0xff01 0x0000
 
+//Writing the instruction 0xF6 (stored in register 0) to the bus
+//Writing the data that will be written: 0x01
+//writing the address (line) in which the data will be written: 0x09 (line 10)
+WBUS 0xFF01 0xFF09 0x0000
+
+//Stopping the program
 STP 0x0000 0x0000 0x0000

src/emulator/IO/disk/disk.cpp

@@ -1,6 +1,7 @@
 #include "./disk.hpp"
 #include <iostream>
 #include <fstream>
+#include <vector>
 
 /*
     Disclaimer
@@ -16,12 +17,52 @@ Disk::Disk(SystemBus &bus) : IOInterface(bus){
 
 void Disk::write(byte data){
 
+    const long lineNumber = this->getBus()->readAddress();
+
+
+    /*
+        To be able to add a byte to any line we need to
+        read the file so we can edit the line that we want
+        and then rewrite the file with the new data
+
+        We can't edit a specific line with std::ofstream
+    */
+
+    //Preparing to read file
+    std::ifstream readingFile("disk.txt");
+    std::vector<std::string> lines;
+    std::string line;
+
+    //Reading file
+    if(readingFile.is_open()){
+        while(std::getline(readingFile, line)){
+            lines.push_back(line);
+        }
+        readingFile.close();
+    }
+
+    //Adding empty lines if the file is too short
+    while(lines.size() <= lineNumber){
+        lines.push_back("");
+    }
+
+    //Editing the line
+    lines[lineNumber] = std::to_string(static_cast<int>(data));
+
+
     std::ofstream file("disk.txt");
 
-    if(file.is_open()){
-        file << static_cast<int>(data) << '\n';
-        file.close();
-    } else {
+    //Rewriting to file
+    std::ofstream writingFile("disk.txt");
+
+    if(writingFile.is_open()){
+        for(const auto& line: lines){
+            writingFile << line << "\n";
+        }
+        writingFile.close();
+    } 
+
+    else {
         std::cout << "Unable to open file\n";
     }