Fix in svim buffers

lib/svim.nasm

@@ -151,7 +151,7 @@ svim:
     mov dl, [global_disk_identifier]    ;Drive number
     int 0x13 
 
-    mov bx, .fileindex_for_open_file
+    mov bx, .buffer_for_svim
     add bx, 510
     mov ax, [bx]
     mov [.buffer_counter_svim], ax
@@ -161,6 +161,9 @@ svim:
     call print
 
 .svim_loop:
+    xor bx, bx
+    xor cx, cx
+    xor dx, dx
     mov ax, 0x1000 ; BIOS call to wait for key
     int 0x16
     cmp ax, 0x1c0d ; enter key
@@ -171,8 +174,8 @@ svim:
 .no_enter:
     cmp ax, 0x11b ; ESC key
     je .end_svim
-    cmp ax, 0x3c00 ; f2 key
-    je .f_key_pushed
+    ;cmp ax, 0x3c00 ; f2 key
+    ;je .f_key_pushed
     cmp ax, 0x0e08 ; backspace
     je .backspace_pushed
     mov bx, ax
@@ -197,7 +200,7 @@ svim:
     ;DL  Drive
     ;ES:BX   Buffer Address Pointer
     mov ax, [.buffer_counter_svim]
-    mov bx, .fileindex_for_open_file
+    mov bx, .buffer_for_svim
     add bx, 510
     mov [bx], ax
 
@@ -229,16 +232,17 @@ svim:
     ret
 
 .backspace_pushed:
-    pusha
     mov bx, [.buffer_counter_svim]
     cmp bx, 0
     je .svim_loop
+    ;print_format .debug_buffer_counter, bx
     mov cx, bx
     sub cx, 1
     mov bx, .buffer_for_svim
     add bx, cx
     mov BYTE [bx], 0
     mov [.buffer_counter_svim], cx
+    ;print_format .debug_buffer_counter, cx
     ; Go back one space
     mov ax, 0x0e08 ; ah=0x0e means teletype output. al=0x08 means backspace character.
     int 0x10
@@ -250,22 +254,21 @@ svim:
     ; Go back one space again as the above print of NULL pushes the cursor forward again.
     mov ax, 0x0e08
     int 0x10
-    popa
     jmp .svim_loop
 
 
-.f_key_pushed:
-    mov al, 0x01    ;arg: index 1
-    call os_change_screen
-    jmp .svim_loop
+;.f_key_pushed:
+    ;mov al, 0x01    ;arg: index 1
+    ;call os_change_screen
+    ;jmp .svim_loop
 
 ;.load_buffer_svim:
 
-
+.debug_buffer_counter db 'Buffer count: %d', 13, 10, 0
 .welcome_svim db 'Vim like text editor for SingOS, ESC to exit', 0
 .welcome_svim_select_file db 'svim - Open file: ', 0
 .welcome_svim_enter_fileindex db 'Enter fileindex: ', 0
-.seperate_line  db '________________________________________________________________________________', 13, 10, 0
+.seperate_line  db '________________________________________________________________________________', 0
 .fileindex_for_open_file dw 0
 .buffer_for_svim times 512 dw 0 ; db 'this is the buffer', 0, times 32 db 0
 .buffer_counter_svim dw 0