Command 'xex' added, going to be the command for executing a program from a file

CLI/CLI.nasm

@@ -158,9 +158,9 @@ CLI_EXECUTE:
   ret
 
   .tmp dw 0
-  .Num_Commands dw 10
-  .Command_Name_List dw .CMD1, .CMD2, .CMD3, .CMD4, .CMD5, .CMD6, .CMD7, .CMD8, .CMD9, .CMDa
-  .Command_Function_Pointers dw dumpmem_hardcoded_args, keyprint, svim, lsfs_list_files_command, lsfs_create_file, lsfs_format_disk, lsfs_get_fs_info, os_clear_screen, print_help_message, Go32Bit
+  .Num_Commands dw 11
+  .Command_Name_List dw .CMD1, .CMD2, .CMD3, .CMD4, .CMD5, .CMD6, .CMD7, .CMD8, .CMD9, .CMDa, .CMDb
+  .Command_Function_Pointers dw dumpmem_hardcoded_args, keyprint, svim, lsfs_list_files_command, lsfs_create_file, lsfs_format_disk, lsfs_get_fs_info, os_clear_screen, print_help_message, Go32Bit, xex
   .CMD1 db 'dumpmem', 0
   .CMD2 db 'keyprint', 0
   .CMD3 db 'svim', 0
@@ -171,5 +171,6 @@ CLI_EXECUTE:
   .CMD8 db 'clear', 0
   .CMD9 db 'help', 0
   .CMDa db 'go32', 0
+  .CMDb db 'xex', 0
 
 

kernel.nasm

@@ -13,6 +13,7 @@ jmp sing_loaded
 %include "lib/debug_tools.nasm"
 %include "lib/std_power.nasm"
 %include "lib/svim.nasm"
+%include "lib/xex.nasm"
 %include "filesystems/lsfs/lsfs.nasm" ; old filesystem was ;%include "vsfs/vsfs.nasm"
 %include "CLI/CLI.nasm"
 
@@ -272,7 +273,6 @@ wait_for_key:
         jmp .no_str
         ;
 
-
 global_vars:
     global_lsfs_master_record dw 2064  ; this is the index of the start of the master table for the filesystem
                                        ; This should maby contain more information.
@@ -287,7 +287,7 @@ global_vars:
                                     ; this is the bios ID
 
 data:
-    welcome db "###############################################################################", 13, 10, "# Welcome to SingOS - VERSION 0.0.5.1                                         #", 13, 10, "#                                                                             #", 13, 10, "###############################################################################", 13, 10, 'Press ESC to halt.', 13, 10, 13, 10, 0
+    welcome db "###############################################################################", 13, 10, "# Welcome to SingOS - VERSION 0.0.5.2                                         #", 13, 10, "#                                                                             #", 13, 10, "###############################################################################", 13, 10, 'Press ESC to halt.', 13, 10, 13, 10, 0
     exit_message db 13, 10, 'Goodbye from SingOS',13,10,'The system has halted.', 0
     command_line db 13, 10, 'groot@SingOS $ ', 0
     number_one_zstring db '71', 0

lib/xex.nasm

@@ -0,0 +1,94 @@
+
+; This is the "program" to execute a program 
+xex: 
+	pusha ; save state before program
+    
+    call os_clear_screen
+    call lsfs_list_files_command
+    
+    ; move cursor to the bootom 
+    xor ax, ax
+    xor bx, bx 
+    mov ah, 0x02
+    mov bh, 0x00 ; page number 0 
+    mov dh, 0x17 ; row zero 
+    mov dl, 0x00 ; coloumn zero
+    int 0x10
+
+    mov si, .welcome_xex_enter_fileindex
+    call print
+
+.enter_fileindex_loop:
+    push cx
+.loop_no_push:    
+    mov ax, 0x10 ; BIOS call to wait for key
+    int 0x16
+    cmp ax, 0x1c0d ; enter key
+    je .fileindex_done
+    cmp ax, 0x0e08 ; backspace
+    jne .no_enter_fileindex
+    cmp cx, 0    
+    je .loop_no_push
+    pop cx
+    sub cx, 1
+    mov bx, [.program_executable_buffer]
+    add bx, cx
+    mov BYTE [bx], 0
+    ; Go back one space
+    mov ax, 0x0e08 ; ah=0x0e means teletype output. al=0x08 means backspace character.
+    int 0x10
+
+    ; Place a NULL
+    mov al, 0x0 ; NULL
+    int 0x10
+
+    ; Go back one space again as the above print of NULL pushes the cursor forward again.
+    mov ax, 0x0e08
+    int 0x10
+    jmp .enter_fileindex_loop
+
+.no_enter_fileindex:
+    mov bh, 0x00
+    mov bl, 0x02 
+    mov ah, 0x0E 
+    int 0x10 ; print char
+    pop cx
+    mov bx, [.program_executable_buffer]
+    add bx, cx
+    mov [bx], al
+    add cx, 1
+    ; fileindex must only be 120 chars
+    cmp cx, 120
+    jae .fileindex_done
+    
+    jmp .enter_fileindex_loop
+
+.fileindex_done:
+    pop cx ; Cleanup, and now contain filename size
+    mov ax, cx
+    add ax, [.program_executable_buffer]
+    mov bx, ax
+    mov BYTE [bx], 0
+    mov si, [.program_executable_buffer]
+    call zstring_to_integer ; ax now contain the interger index for the file
+    mov [.fileindex_for_open_file], ax ; save the file index
+
+    
+    ;mov ax, [.fileindex_for_open_file]
+    ;mov bx, [.program_executable_buffer]
+    ;call lsfs_read_file
+
+    ;mov [.program_executable_buffer], ax
+
+    ; I guess we should have something like 
+    ; call ax ; here. We want to execute the file that we just have benn loaded in memory 
+    		  ; The executable should make use of the global systemcall table. 
+    		  ; That is what we are trying to get to work here. 
+
+    popa ; retore
+    ret
+
+
+.welcome_xex_enter_fileindex db 'Enter program index to execute: ', 0
+.program_executable_buffer db 0
+.fileindex_for_open_file dw 0