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2026-05-10T05:06:05Z
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Brian: Created page with "<syntaxhighlight lang="asm"> %macro getchar 1 ;"getchar()" cmp byte [esi],0 jnz .getchar_bottom push eax push ..."
2011-10-19T00:33:49Z
<p>Created page with "<syntaxhighlight lang="asm"> %macro getchar 1 ;"getchar()" cmp byte [esi],0 jnz .getchar_bottom push eax push ..."</p>
<p><b>New page</b></p><div><syntaxhighlight lang="asm"><br />
%macro getchar 1 ;"getchar()"<br />
cmp byte [esi],0<br />
jnz .getchar_bottom<br />
push eax<br />
push ebx<br />
push ecx<br />
push edx<br />
mov eax,3 ;sys_read<br />
mov ebx,0 ;stdin<br />
mov ecx,esi ;buf<br />
mov edx,100 ;#bytes<br />
int 0x80<br />
add esi,eax ;just after last byte<br />
mov byte [esi],0 ;so we remember<br />
sub esi,eax<br />
pop edx<br />
pop ecx<br />
pop ebx<br />
pop eax<br />
.getchar_bottom:<br />
mov %1,byte [esi]<br />
inc esi<br />
%endmacro<br />
%macro putchar 1<br />
mov byte [edi],%1<br />
inc edi<br />
%endmacro<br />
section .text<br />
global _start ;must be declared for linker (ld)<br />
_start:<br />
mov esi,indata<br />
mov byte [esi],0<br />
mov edi,outdata ;output pointer<br />
call getint<br />
mov ebx,eax<br />
call getint<br />
add eax,ebx<br />
call putint<br />
putchar 10 ;"printf("\n")"<br />
mov eax,4 ;sys_write<br />
mov ebx,1 ;stdout<br />
mov ecx,outdata<br />
mov edx,edi<br />
sub edx,outdata ;#bytes<br />
int 0x80 ;"write(stdout,outdata,edi-outdata)"<br />
mov eax,1 ;sys_exit<br />
mov ebx,0 ;success<br />
int 0x80 ;"exit(0)"<br />
<br />
getint: ;"scanf("%d",&eax)"<br />
mov eax,0<br />
push ebx<br />
mov ebx,0<br />
mov ecx,0 ;negative or not<br />
getint_eatwhite:<br />
getchar bl<br />
cmp ebx,32<br />
jg getint_top<br />
jmp getint_eatwhite<br />
getint_top:<br />
cmp ebx,'-'<br />
jnz getint_notminus<br />
getchar bl<br />
mov ecx,1<br />
getint_notminus:<br />
sub ebx,'0'<br />
lea eax,[4*eax+eax] ;eax *= 5<br />
shl eax,1 ;eax *= 2<br />
add eax,ebx<br />
getchar bl<br />
cmp ebx,32<br />
jle getint_bottom<br />
jmp getint_top<br />
getint_bottom:<br />
cmp ecx,0<br />
jz getint_return<br />
neg eax<br />
getint_return:<br />
pop ebx<br />
ret<br />
<br />
putint: ;"printf("%d",eax)"<br />
cmp eax,0<br />
jge putint_nonnegative<br />
neg eax<br />
putchar 45 ;minus sign<br />
putint_nonnegative:<br />
cmp eax,10<br />
jl putint_base<br />
mov edx,0<br />
mov ebx,10<br />
div ebx<br />
push edx<br />
call putint<br />
pop edx<br />
add edx,'0'<br />
putchar dl<br />
ret<br />
putint_base:<br />
add eax,'0'<br />
putchar al<br />
ret<br />
read:<br />
<br />
<br />
section .bss<br />
indata resb 20<br />
outdata resb 20<br />
</syntaxhighlight></div>
Brian