diff options
Diffstat (limited to 'terminal.asm')
| -rw-r--r-- | terminal.asm | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/terminal.asm b/terminal.asm new file mode 100644 index 0000000..b3beb7c --- /dev/null +++ b/terminal.asm @@ -0,0 +1,73 @@ +%ifndef _TERMINAL_ASM +%define _TERMINAL_ASM + +MAXBUF equ 254 + +terminal: + push bp + mov bp, sp + ;sub sp, MAXBUF ; allocate large string buffer + + .clear_buffer: + mov cx, MAXBUF + mov bx, t_buffer + mov di, bx + .cl: + mov [di], byte 0 + inc di + dec cx + jne .cl + mov di, bx + + .do_prompt: + mov cx, 0 + mov al, CR + call putc + + push t_msg_prompt + push t_msg_prompt_fmt + call printf + add sp, 4 + + mov di, t_buffer + .read_command: + call kbd_read + .update_buffer: + cmp al, CR + je .dump_buffer + stosb + inc cx + + jmp .output + + .dump_buffer: + cmp [di-1], byte 0 + je .do_prompt + + mov al, CR + call putc + + push t_buffer ; push onto stack + push t_buffer_fmt + call printf ; write out string + add sp, 4 + + jmp .clear_buffer + + .output: + call putc + jmp .read_command + + jmp .do_prompt + + mov sp, bp + pop bp + ret + +; data +t_msg_prompt_fmt: db '%s', 0 +t_msg_prompt: db '$ ', 0 +t_buffer_fmt: db '%s', 0 +t_buffer: times MAXBUF db 0 + +%endif |