Add save/unsave cursor escape sequences.

Also added a little terminal test program called /bin/tst.

Kernel/Console.cpp

@@ -171,10 +171,22 @@ void Console::escape$m(const Vector<unsigned>& params)
             break;
         }
     }
-
     vga_set_attr(m_currentAttribute);
 }
 
+void Console::escape$s(const Vector<unsigned>&)
+{
+    m_savedCursorRow = m_cursorRow;
+    m_savedCursorColumn = m_cursorColumn;
+}
+
+void Console::escape$u(const Vector<unsigned>&)
+{
+    m_cursorRow = m_savedCursorRow;
+    m_cursorColumn = m_savedCursorColumn;
+    vga_set_cursor(m_cursorRow, m_cursorColumn);
+}
+
 void Console::escape$H(const Vector<unsigned>& params)
 {
     unsigned row = 1;
@@ -229,6 +241,8 @@ void Console::executeEscapeSequence(byte final)
     case 'H': escape$H(params); break;
     case 'J': escape$J(params); break;
     case 'm': escape$m(params); break;
+    case 's': escape$s(params); break;
+    case 'u': escape$u(params); break;
     default: break;
     }
 

Kernel/Console.h

@@ -21,12 +21,18 @@ private:
     void escape$H(const Vector<unsigned>&);
     void escape$J(const Vector<unsigned>&);
     void escape$m(const Vector<unsigned>&);
+    void escape$s(const Vector<unsigned>&);
+    void escape$u(const Vector<unsigned>&);
 
     const byte m_rows { 25 };
     const byte m_columns { 80 };
+
     byte m_cursorRow { 0 };
     byte m_cursorColumn { 0 };
 
+    byte m_savedCursorRow { 0 };
+    byte m_savedCursorColumn { 0 };
+
     byte m_currentAttribute { 0x07 };
 
     void executeEscapeSequence(byte final);
@@ -41,7 +47,5 @@ private:
     EscapeState m_escState { Normal };
     Vector<byte> m_parameters;
     Vector<byte> m_intermediates;
-
-    const byte* s_vgaMemory { (const byte*)0xb8000 };
 };
 

Kernel/sync-sh

@@ -14,6 +14,7 @@ cp ../Userland/hostname mnt/bin/hostname
 cp ../Userland/cat mnt/bin/cat
 cp ../Userland/uname mnt/bin/uname
 cp ../Userland/clear mnt/bin/clear
+cp ../Userland/tst mnt/bin/tst
 cp kernel.map mnt/
 umount mnt
 sync

Userland/.gitignore

@@ -12,3 +12,4 @@ hostname
 cat
 uname
 clear
+tst

Userland/Makefile

@@ -11,7 +11,8 @@ OBJS = \
        hostname.o \
        cat.o \
        uname.o \
-       clear.o
+       clear.o \
+       tst.o
 
 APPS = \
        id \
@@ -26,7 +27,8 @@ APPS = \
        hostname \
        cat \
        uname \
-       clear
+       clear \
+       tst
 
 ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
@@ -85,6 +87,9 @@ uname: uname.o
 clear: clear.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+tst: tst.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 

Userland/tst.cpp

@@ -0,0 +1,11 @@
+#include <LibC/stdio.cpp>
+
+int main(int argc, char** argv)
+{
+    printf("Counting to 100000: \033[s");
+    for (unsigned i = 0; i <= 100000; ++i) {
+        printf("\033[u\033[s%u", i);
+    }
+    printf("\n");
+    return 0;
+}