watermark allocator

kernel.asm

@@ -25,6 +25,8 @@
         $0000000; Cycles
     label KeyPressedState:
         $0000000; The ID of a Key Being Pressed (If Any)
+    label _allocator_ptr:
+         $000000
 
 @ $4B0C0:
 
@@ -52,6 +54,7 @@ data image wallpaper.png wallpaper.png
 data ascii quit_label QUIT
 data ascii jump_label JUMP
 data ascii diss_label DISS
+data ascii alloc_label ALLOC
 
 data buffer command_line_input 64
 
@@ -135,6 +138,12 @@ data ascii diss_ret ret
 data ascii diss_unknown unknown opcode
 
 
+; structure asm block
+; start length
+; n ptr yo bu
+
+
+
 label append_num_to_string:
     tx $8 $4
     loadi $6 7
@@ -314,6 +323,19 @@ label do_shell:
             add $4 $5 $4
             call jump
 
+
+        loadi $4 @command_line_input
+        loadi $5 alloc_label
+        loadi $6 5
+        call strcmp
+        loadi $2 1
+        jneq +6
+            call shift_terminal
+            bzero command_line_input
+            loadi $4 10;
+            call $FFFFF0
+            call append_num_to_string
+
         ret
 
 label handle_keypress:
@@ -364,9 +386,8 @@ label handle_keypress:
     loadi $4 label_cycles
     call draw_string;
 
-    loadi $4 $4B000
-    loadi $2 $40
-    add $2 $4 $4
+
+    loadi $4 _allocator_ptr
     call print_addr
 
     loadi $9 1;
@@ -444,4 +465,18 @@ label handle_keypress:
     call draw_string;
 
     updsp
-    jmp $CB000;
+    jmp $CB000;
+
+
+; Very Very Watermark Allocator
+@ $FFFFF0:
+    ; $4 contains a length which corresponds to number of bytes
+    label allocator:
+        load $1 _allocator_ptr
+        add $1 $4 $1
+        store $1 _allocator_ptr
+        loadi $2 $FFFFF0
+        sub $2 $1 $2
+        sub $2 $4 $4
+
+        ret