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suso.asm
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suso.asm
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;
; Copyright (c) 2006 Marcel Kaiser <mk@nic-nac-project.org>
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions
; are met:
; 1. Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; 2. Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; 3. The name of the author may not be used to endorse or promote products
; derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
; SUCH DAMAGE.
;
;
;
BITS 32
CPU 586
%include "sysf.inc"
%define TAB 9
%define LF 0xa
%define SUDO_SZ 81
%define BUF_SZ 1024
;+++++++++++++++++++++++++++++++++++++++++++
;+ search_in_col +
;+-----------------------------------------+
;+args: edi = addr(sudoku) +
;+ dl = number +
;+ al = col +
;+ret : > 0 if found else 0 +
;+++++++++++++++++++++++++++++++++++++++++++
%macro search_in_col 0 ;+
push edi ;+
push ecx ;+
mov cl, 9 ;+
.go_on0: cmp byte[edi+eax], dl ;+
je .found0 ;+
add edi, 9 ;+ next row
dec cl ;+
jnz .go_on0 ;+
xor al, al ;+ return 0
jmp .bye0 ;+
.found0: inc al ;+ return > 0
.bye0: pop ecx ;+
pop edi ;+
%endmacro ;+
;+++++++++++++++++++++++++++++++++++++++++++
;+++++++++++++++++++++++++++++++++++++++++++
;+ search_in_row +
;+-----------------------------------------+
;+args: edi = addr(sudoku) +
;+ dl = number +
;+ al = row +
;+ret : > 0 if found else 0 +
;+++++++++++++++++++++++++++++++++++++++++++
%macro search_in_row 0 ;+
push edi ;+
push ecx ;+
mov cl, 10 ;+
add edi, eax ;+
mov al, dl ;+
repne scasb ;+
xor al, al ;+
or cl, cl ;+
setnz al ;+
pop ecx ;+
pop edi ;+
%endmacro ;+
;+++++++++++++++++++++++++++++++++++++++++++
;+++++++++++++++++++++++++++++++++++++++++++
;+ search_in_sqr +
;+-----------------------------------------+
;+args: edi = addr(sudoku) +
;+ dl = number +
;+ ebx = (row|col) +
;+ret : > 0 if found , else 0 +
;+++++++++++++++++++++++++++++++++++++++++++
%macro search_in_sqr 0 ;+
push edi ;+
push ecx ;+
add edi, eax ;+
mov cl, 3 ;+
.search: cmp byte[edi+0], dl ;+
je .found2 ;+
cmp byte[edi+1], dl ;+
je .found2 ;+
cmp byte[edi+2], dl ;+
je .found2 ;+
add edi, 9 ;+
dec cl ;+
jnz .search ;+
xor al, al ;+
jmp .bye2 ;+
.found2: inc al ;+
.bye2: pop ecx ;+
pop edi ;+
%endmacro ;+
;+++++++++++++++++++++++++++++++++++++++++++
;+++++++++++++++++++++++++++++++++++++++++++
;+ print_sudoku +
;+-----------------------------------------+
;args: edi = addr(sudoku) +
;+++++++++++++++++++++++++++++++++++++++++++
%macro print_sudoku 0 ;+
mov cl, SUDO_SZ ;+
lea esi, [buf] ;+
push esi ;+
.to_ascii: mov dl, byte[edi] ;+
add dl, 48 ;+
mov byte[esi], dl ;+
inc edi ;+
inc esi ;+
mov byte[esi], ' ' ;+
inc esi ;+
dec cl ;+
jnz .to_ascii ;+
pop esi ;+
push esi ;+
mov cl, 9 ;+
.do_nl: add esi, 17 ;+
mov byte[esi],LF ;+
inc esi ;+
dec cl ;+
jnz .do_nl ;+
.ok: pop esi ;+
Write STDOUT, esi, 9*18 ;+
%endmacro ;+
;+++++++++++++++++++++++++++++++++++++++++++
;+++++++++++++++++++++++++++++++++++++++++++
section .bss ;+
;+
buf resb BUF_SZ ;+
sudoku resb SUDO_SZ ;+
ptr_buf resb SUDO_SZ ;+
;+++++++++++++++++++++++++++++++++++++++++++
;+++++++++++++++++++++++++++++++++++++++++++
section .data ;+
;+
missing db 00 ;+
;+
pre_cal db 00,00,00, 03,03,03, ;+
db 06,06,06, 00,00,00, ;+
db 03,03,03, 06,06,06, ;+
db 00,00,00, 03,03,03, ;+
db 06,06,06, 27,27,27, ;+
db 30,30,30, 33,33,33, ;+
db 27,27,27, 30,30,30, ;+
db 33,33,33, 27,27,27, ;+
db 30,30,30, 33,33,33, ;+
db 54,54,54, 57,57,57, ;+
db 60,60,60, 54,54,54, ;+
db 57,57,57, 60,60,60, ;+
db 54,54,54, 57,57,57, ;+
db 60,60,60 ;+
;+++++++++++++++++++++++++++++++++++++++++++
section .text
global _start
;align 4
_start:
;++++++++++++++++++++++++++++++++++++++++++
; read sudoku from STDIN, skip +
; white spaces and convert the +
; ascii-codes. +
;++++++++++++++++++++++++++++++++++++++++++
Read STDIN, buf, BUF_SZ ;+ read sudoku
xor eax, eax ;+
xor ecx, ecx ;+
.L1: cmp byte[buf+eax], LF ;+ if [buf+eax] = LF
je .skip ;+ or
cmp byte[buf+eax], ' ' ;+ [buf+eax] = ' '
je .skip ;+ or
cmp byte[buf+eax], TAB ;+ [buf+eax] = TAB
je .skip ;+ then skip
mov dl, byte[buf+eax] ;+
sub dl, 48 ;+ we need the value,
;+ not the ascii-code.
mov [sudoku+ecx], dl ;+
inc cl ;+
cmp cl, SUDO_SZ ;+
je .get_pos ;+
.skip: inc ax ;+ skip one byte
jmp .L1 ;+
;++++++++++++++++++++++++++++++++++++++++++
;++++++++++++++++++++++++++++++++++++++++++
; save the positions of ;+
; missing numbers in ptr_buf. ;+
;++++++++++++++++++++++++++++++++++++++++++
.get_pos: xor ebx, ebx ;+
lea edi, [sudoku] ;+
lea esi, [ptr_buf] ;+
push esi ;+
mov cl, SUDO_SZ ;+
.get_next: cmp byte[edi+ebx], 0 ;+
je .save_index ;+
inc ebx ;+
dec cl ;+
jnz .get_next ;+
jmp .main ;+
.save_index: mov byte[esi], bl ;+
inc esi ;+
inc ebx ;+
inc byte[missing] ;+
dec cl ;+
jnz .get_next ;+
;++++++++++++++++++++++++++++++++++++++++++
;++++++++++++++++++++++++++++++++++++++++++
.main: pop esi ;+ esi = ptr_buf
mov dh, 9
mov cl, [missing] ;+ number of missing numbers
jmp .solve ;+
.back_track: mov byte[edi+ebx], 0 ;+
inc cl ;+
dec esi ;+
.solve: mov bl, byte[esi] ;+ position of missing number
mov dl, byte[edi+ebx] ;+
inc dl ;+
cmp dl, 10 ;+ we've tryed 1,2,...,9
jge .back_track ;+ ... so, go back
mov al, bl ;+
div dh ;+
mov [missing], ah ;+ store col
xor ah, ah ;+
mul dh ;+
search_in_row ;+
or al, al ;+
jnz .got_it ;+
mov al, [missing] ;+ restore col
search_in_col ;+
or al, al ;+
jnz .got_it ;+
mov al, byte[pre_cal+ebx];+
search_in_sqr ;+
or al, al ;+
jnz .got_it ;+
mov byte[edi+ebx], dl ;+
inc esi ;+
dec cl ;+
jnz .solve ;+
jmp .done ;+
.got_it: mov byte[edi+ebx], dl ;+ next number
jmp .solve ;+
.done: print_sudoku ;+
Exit 0 ;+
;++++++++++++++++++++++++++++++++++++++++++
kernel: int KERNEL_INT
ret