add string demo

c_os/user/MainMenu.cc

@@ -6,6 +6,7 @@
 #include "user/demo/PCSPKdemo.h"
 #include "user/demo/PreemptiveThreadDemo.h"
 #include "user/demo/SmartPointerDemo.h"
+#include "user/demo/StringDemo.h"
 #include "user/demo/TextDemo.h"
 #include "user/demo/VBEdemo.h"
 #include "user/demo/VectorDemo.h"
@@ -33,7 +34,7 @@ void MainMenu::run() {
     while (running) {
         input = this->listener.waitForKeyEvent();
 
-        if (input >= '0' && input <= '9') {
+        if ((input >= '0' && input <= '9') || input == '!') {
             switch (input) {
             case '1':
                 running_demo = scheduler.ready<TextDemo>();
@@ -66,6 +67,9 @@ void MainMenu::run() {
             case '0':
                 running_demo = scheduler.ready<SmartPointerDemo>();
                 break;
+            case '!':
+                running_demo = scheduler.ready<StringDemo>();
+                break;
             }
         } else if (input == 'k') {
             scheduler.nice_kill(running_demo);  // NOTE: If thread exits itself this will throw error

c_os/user/demo/StringDemo.cc

@@ -0,0 +1,54 @@
+#include "user/demo/StringDemo.h"
+#include "kernel/Globals.h"
+#include "user/lib/String.h"
+
+void StringDemo::run() {
+    kout.lock();
+    kout.clear();
+
+    log.info() << "Allocating new string" << endl;
+    bse::string str1 = "This is a dynamically allocated string!";
+    kout << str1 << endl;
+
+    log.info() << "Reassign string" << endl;
+    str1 = "Hello";
+    kout << str1 << " has length " << str1.size() << endl;
+    kout << "Again with strlen: Hello has length " << bse::strlen("Hello") << endl;
+
+    kout << "Adding strings: " << str1 << " + World" << endl;
+    log.info() << "Adding strings" << endl;
+    str1 = str1 + " World";
+    kout << str1 << endl;
+
+    kout << "Hello += World" << endl;
+    log.info() << "Hello += World" << endl;
+    bse::string str3 = "Hello";
+    str3 += " World";
+    kout << str3 << endl;
+
+    kout << "String iterator!" << endl;
+    for (const char c : str1) {
+        kout << c << " ";
+    }
+    kout << endl;
+
+    log.info() << "Allocating new string" << endl;
+    bse::string str2 = "Hello World";
+    kout << "str1 == str2: " << static_cast<int>(str1 == str2) << endl;
+    kout << "strcmp(Hello, Hello): " << bse::strcmp("Hello", "Hello") << endl;
+
+    log.info() << "Reassign str2" << endl;
+    str2 = "Hello";
+
+    bse::array<char, 5> arr;
+    arr[0] = 'H';
+    arr[1] = 'e';
+    arr[2] = 'l';
+    arr[3] = 'l';
+    arr[4] = 'o';
+    kout << "bse::array<char, 5> to bse::string: " << arr << ", size: " << ((bse::string)arr).size() << endl;
+    kout << "(bse::string)arr (" << arr << ") == str2 (" << str2 << "): " << static_cast<int>((bse::string)arr == str2) << endl;
+
+    kout.unlock();
+    scheduler.exit();
+}

c_os/user/demo/StringDemo.h

@@ -0,0 +1,16 @@
+#ifndef __StringDemo_include__
+#define __StringDemo_include__
+
+#include "kernel/Globals.h"
+
+class StringDemo : public Thread {
+private:
+    StringDemo(const StringDemo& copy) = delete;
+
+public:
+    StringDemo() : Thread("StringDemo") {}
+
+    void run() override;
+};
+
+#endif