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