[file head]:

; ------------------------------------------------------------------------
; 显示 AL 中的数字
; ------------------------------------------------------------------------
DispAL:
push ecx
push edx
push edi

mov edi, [dwDispPos]

mov ah, 0Fh ; 0000b: 黑底 1111b: 白字
mov dl, al
shr al, 4
mov ecx, 2
.begin:
and al, 01111b
cmp al, 9
ja .1
add al, '0'
jmp .2
.1:
sub al, 0Ah
add al, 'A'
.2:
mov [gs:edi], ax
add edi, 2

mov al, dl
loop .begin
;add edi, 2

mov [dwDispPos], edi

pop edi
pop edx
pop ecx

ret
; DispAL 结束-------------------------------------------------------------


; ------------------------------------------------------------------------
; 显示一个整形数
; ------------------------------------------------------------------------
DispInt:
mov eax, [esp + 4]
shr eax, 24
call DispAL

mov eax, [esp + 4]
shr eax, 16
call DispAL

mov eax, [esp + 4]
shr eax, 8
call DispAL

mov eax, [esp
... ...

[file tail]:
... ...
\n");
add esp, 4

ret
; DispReturn 结束---------------------------------------------------------


; ------------------------------------------------------------------------
; 内存拷贝，仿 memcpy
; ------------------------------------------------------------------------
; void* MemCpy(void* es:pDest, void* ds:pSrc, int iSize);
; ------------------------------------------------------------------------
MemCpy:
push ebp
mov ebp, esp

push esi
push edi
push ecx

mov edi, [ebp + 8] ; Destination
mov esi, [ebp + 12] ; Source
mov ecx, [ebp + 16] ; Counter
.1:
cmp ecx, 0 ; 判断计数器
jz .2 ; 计数器为零时跳出

mov al, [ds:esi] ; ┓
inc esi ; ┃
; ┣ 逐字节移动
mov byte [es:edi], al ; ┃
inc edi ; ┛

dec ecx ; 计数器减一
jmp .1 ; 循环
.2:
mov eax, [ebp + 8] ; 返回值

pop ecx
pop edi
pop esi
mov esp, ebp
pop ebp

ret ; 函数结束，返回
; MemCpy 结束-------------------------------------------------------------