1 files changed, 82 insertions, 0 deletions
diff --git a/kernel/shell.c b/kernel/shell.c
new file mode 100644
index 0000000..837a4c3
--- /dev/null
+++ b/kernel/shell.c
@@ -0,0 +1,82 @@
+#include "kernel.h"
+
+#define COMMAND_LENGTH 255
+
+static char command[COMMAND_LENGTH];
+static int pos=0;
+
+// in timer:
+uint16_t timer16;
+
+void shell_init()
+{
+    pos=0;
+    command[0]=0;
+
+    scr_nextline();
+    scr_put_string_nl("***********************");
+    scr_put_string_nl("Fools Shell v 0.0.0.1 *");
+    scr_put_string_nl("***********************");
+    scr_nextline();
+    scr_put_string("Command> ");
+}
+
+void shell_put(char x)
+{
+    if(pos<COMMAND_LENGTH-2);
+
+    command[pos]=x;
+    pos++;
+
+    command[pos]=0;
+    
+}
+
+void shell_backspace()
+{
+    if(pos>0);
+    pos--;
+    command[pos]=0;
+
+}
+
+
+int strcmp(char *b1, char *b2)
+{
+    int i=0;
+    while(b1[i]==b2[i]&&b1[i]!=0&&b2[i]!=0) i++;	
+
+    if(b1[i]==0&&b2[i]==0)return 1;
+
+    return 0;
+}
+
+// TODO: EXECUTE LATER not inside INTERRUPT !!!
+
+void shell_execute()
+{
+    scr_nextline();
+    scr_put_string("  processing command: ");
+    scr_put_string_nl(command);
+
+    if(1==strcmp(command,"TIME"))
+    {
+	scr_put_string_nl("  getting sys time from kernel");
+	scr_put_string("  ");
+	scr_put_hex(timer16);
+	scr_put_string_nl("  seconds passed since system start.");
+    }
+    else
+    {
+	scr_put_string_nl("  unsupported command, sorry!");
+    }
+    
+    pos=0;
+
+    scr_nextline();
+    scr_put_string("Command> ");
+
+}
+
+
+