section .data
infile db "input.bin", 0
outfile db "output.bin", 0
section .bss
fd_in resd 1
fd_out resd 1
buf resd 1000000 ; до ~4MB / 4 байта
size resd 1
section .text
global _start
_start:
; --- open input.bin ---
mov eax, 5
mov ebx, infile
mov ecx, 0
int 0x80
mov [fd_in], eax
; --- read file ---
mov eax, 3
mov ebx, [fd_in]
mov ecx, buf
mov edx, 4000000
int 0x80
mov [size], eax
; --- close input ---
mov eax, 6
mov ebx, [fd_in]
int 0x80
; количество чисел = size / 4
mov ecx, [size]
shr ecx, 2
cmp ecx, 1
jle mono_case
mov esi, buf
; флаги
mov ebx, 1 ; can_increase
mov edx, 1 ; can_decrease
mov edi, 0 ; state: 0 = up, 1 = down
; prev = a[0]
mov eax, [esi]
add esi, 4
dec ecx
loop_check:
mov ebp, [esi]
cmp ebp, eax
jl down_step
jg up_step
jmp equal_step
up_step:
cmp edi, 1
je not_pyramid
mov edx, 0
jmp next
down_step:
mov edi, 1
mov ebx, 0
jmp next
equal_step:
jmp next
next:
mov eax, ebp
add esi, 4
loop loop_check
; --- решение ---
cmp ebx, 1
je non_decreasing
cmp edx, 1
je non_increasing
; обычная пирамида
mov eax, 1
jmp write_out
non_increasing:
mov eax, 1
jmp write_out
non_decreasing:
mov eax, -1
jmp write_out
not_pyramid:
mov eax, 0
jmp write_out
mono_case:
mov eax, 1
; --- write output ---
write_out:
; open output.bin
mov ebx, outfile
mov ecx, 577 ; O_CREAT|O_WRONLY|O_TRUNC
mov edx, 0666
mov eax, 5
int 0x80
mov [fd_out], eax
; write int
mov eax, 4
mov ebx, [fd_out]
mov ecx, esp
sub esp, 4
mov [esp], eax
mov ecx, esp
mov edx, 4
int 0x80
add esp, 4
; close
mov eax, 6
mov ebx, [fd_out]
int 0x80
; exit
mov eax, 1
xor ebx, ebx
int 0x80