118 lines
1.8 KiB
ArmAsm
118 lines
1.8 KiB
ArmAsm
%define BUFF_LIM 32768
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; call # val val2
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; int $0x80 eax eax edx -
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;
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; arg1 arg2 arg3 arg4 arg5 arg6 arg7
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; ebx ecx edx esi edi ebp -
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global _start
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[bits 32]
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[section .text]
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_start:
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push 0 ; eof
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mov eax, 5 ; open
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mov ebx, filename
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xor ecx, ecx ; read only
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int 0x80
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mov ebx, eax
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mov eax, 3 ; read
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mov ecx, read_buff
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mov edx, BUFF_LIM
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int 0x80
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cmp eax, -1 ; err
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je exit
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cmp eax, BUFF_LIM
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je .no_eof
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; we hit eof
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inc dword [esp]
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.no_eof:
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; parse section
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lea edi, [read_buff+eax]
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mov esi, read_buff
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.cont_read:
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xor ecx, ecx ; set if first is found
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; last digit in ebx
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xor ebx, ebx
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; counting loop
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xor eax, eax
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push eax ; first digit
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jmp .count_loop_cont
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.count_loop:
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lodsb
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cmp al, 10 ; newline
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je .next_line
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sub al, '0'
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js .count_loop_cont
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cmp al, 9
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jg .count_loop_cont
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test ecx, ecx
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jnz .have_first
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mov [esp], eax ; first digit
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inc ecx
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.have_first:
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mov ebx, eax ; set last to current
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.count_loop_cont:
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cmp esi, edi
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jl .count_loop
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.next_line:
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test ecx, ecx
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jz .cont_read ; no digits!
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pop eax ; first digit
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mov dl, 10
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mul dl
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add eax, ebx
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; add to total
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add [final_value], eax
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; check for more data
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cmp esi, edi
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jl .cont_read
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; TODO handle files over BUFF_LIM bytes
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; check for EOF
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cmp dword [esp], 1
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jne .cont_read
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; we're at EOF, print result
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mov eax, [final_value]
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call print_dec
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jmp exit
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exit:
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mov eax, 1
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int 0x80 ; exit
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; i hate this
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print_dec:
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sub esp, 12
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lea ecx, [esp+11]
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test eax, eax
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jz .zero
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mov esi, 0
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mov ebx, 10
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.div_shit:
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xor edx, edx
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div ebx
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dec ecx
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inc esi
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add dl, '0'
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mov byte [ecx], dl
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test eax, eax
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jnz .div_shit
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mov edx, esi
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jmp .write
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.zero:
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mov byte [esp+10], 0
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lea ecx, [esp+10]
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mov edx, 1 ; count
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.write:
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mov eax, 4 ; write
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mov ebx, 1 ; stdout
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int 0x80
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add esp, 12
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ret
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[section .data]
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final_value: dd 0
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filename: db "input",0
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[section .bss]
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read_buff: resb BUFF_LIM
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