94 lines
960 B
NASM
94 lines
960 B
NASM
mov ax, 0x1000
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mov ds, ax
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mov si, welcome
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call print
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loop:
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mov si, prompt
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call print
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mov di, input
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call read
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cmp byte [input], 0
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je loop
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mov si, input
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call print
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mov si, newline
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call print
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mov cx, 0x4e
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mov di, input
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mov al, 0
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rep stosb
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jmp loop
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print:
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lodsb
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cmp al, 0
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je .done
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mov ah, 0xe
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int 0x10
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jmp print
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.done:
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ret
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read:
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mov cl, 0
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.loop:
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mov ah, 0
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int 0x16
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cmp al, 0xd
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je .return
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cmp al, 8
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je .backspace
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cmp cl, 0x4d
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je .loop
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cmp al, 0x20
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je .space
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cmp al, 0x9
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je .erase
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cmp al, 0
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je .loop
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.character:
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mov byte [di], 0
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mov ah, 0xe
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int 0x10
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stosb
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inc cl
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jmp .loop
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.erase:
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mov al, 0x20
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jmp .character
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.space:
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cmp byte [di], 0
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je .character
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mov al, byte [di]
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mov ah, 0xe
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int 0x10
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inc di
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inc cl
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jmp .loop
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.backspace:
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cmp cl, 0
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je .loop
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mov ah, 0xe
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int 0x10
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dec di
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dec cl
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jmp .loop
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.return:
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mov si, newline
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call print
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ret
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welcome:
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db 0xd, 0xa, "Welcome to EttinOS!", 0xd, 0xa, 0xd, 0xa, 0
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input:
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times 78 db 0
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prompt:
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db "> ", 0
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newline:
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db 0xd, 0xa, 0
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