141 lines
1.9 KiB
NASM
141 lines
1.9 KiB
NASM
section .data
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conbx dw 7
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section .text
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; raw console output
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; IN dl character
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conout mov al, dl
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mov ah, 0x0e
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mov bx, [conbx]
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int 0x10
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ret
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; check if character has characters ready
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; OUT al 0xFF if data, 0 if none
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const mov ah, 1
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int 0x16
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jz .emp
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mov ax, 0xFF
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ret
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.emp mov al, 0
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ret
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; read character from console
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; OUT al character or zero
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conin call const
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test al, al
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jz .ret
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mov al, 0
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int 0x16
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.ret ret
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; dummy: write to auxillary dev
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auxout ret
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; dummy: read from auxillary dev
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auxin mov al, 0x1A
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ret
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; dummy: lister out
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lstout ret
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; character input with echo
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; OUT al character
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getc call const
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test al, al
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jz getc
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call conin
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push ax
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mov dl, al
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call putc
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pop ax
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ret
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; character input without echo
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readc call const
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test al, al
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jz readc
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jmp conin
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; character output
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; IN dl character
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putc jmp conout
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; direct console I/O
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; IN dl character to output or 0xFF if input
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; OUT al character to read
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dcon cmp dl, 0xFF
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je conin
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jmp conout
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; output character string
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; IN ds:dx far ptr to string, '$'-terminated
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puts push si
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mov si, dx
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.loop lodsb
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cmp al, '$'
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je .ret
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mov dl, al
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call putc
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jmp .loop
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.ret pop si
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ret
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; send a beep ctl to console
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beep mov dl, 0x07
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jmp conout
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; buffered input
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; IN ds:dx far ptr to buffer
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gets mov si, dx
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mov cx, [si]
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mov ch, 0
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; ch = actual number of chars
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; cl = maximum number of chars
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.loop call readc
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cmp al, 0x0D
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je .cr
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cmp al, 0x08
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je .bs
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cmp al, 0x20
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jc .loop
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; check if there is space in the buffer
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; emit a beep if not
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mov dl, cl
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dec dl
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cmp ch, dl
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jc .append
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call beep
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jmp .loop
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; append to buffer
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.append mov bh, 0
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mov bl, ch
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mov [si+2+bx], al
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inc ch
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mov dl, al
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call putc
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jmp .loop
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; handle backspace
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.bs: test ch, ch
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jz .loop
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mov dl, 0x08
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call putc
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mov dl, 0x20
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call putc
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mov dl, 0x08
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call putc
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dec ch
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jmp .loop
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; handle carriage return
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.cr mov bx, 0
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mov bl, ch
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mov [si+2+bx], al
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mov [si], cx
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mov dl, 0x0A
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call putc
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mov dl, 0x0D
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call putc
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ret
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