day 7 part 1

07/Makefile

@@ -0,0 +1,3 @@
+all:
+	nasm -g -felf32 main.s && ld -melf_i386 -g main.o
+

07/input_test

@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483

07/main_part1.s

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+global _start
+[bits 32]
+[section .text]
+
+%include "utils.s"
+
+; for h in hands
+;    ; score hands
+;    tmp := 0
+;    counts[15] := [0; 15]
+;    for c in h
+;       if c > '9'
+;          if c = 'T' then score := 10
+;          elif c = 'J' then score := 11
+;          elif c = 'Q' then score := 12
+;          elif c = 'K' then score := 13
+;          elif c = 'A' then score := 14
+;       else
+;          score := c - '0'
+;       end
+;       tmp := (tmp * 14) + score
+;       put in counts
+;    end
+;    ; check hand type
+;    has_five := 0
+;    has_four := 0
+;    has_three := 0
+;    has_two := 0
+;    for n in counts
+;       if n = 5 then inc has_five
+;       if n = 4 then inc has_four
+;       if n = 3 then inc has_three
+;       if n = 2 then inc has_two
+;    end
+;    if has_five then tmp := tmp + 60,000,000
+;    elif has_four then tmp := tmp + 50,000,000
+;    elif has_three and has_two then tmp := tmp + 40,000,000
+;    elif has_three then tmp := tmp + 30,000,000
+;    elif has_two = 2 then tmp := tmp + 20,000,000
+;    elif has_two = 1 then tmp := tmp + 10,000,000
+;    ; store tmp in array
+;    stosd tmp -> hand_array
+;    stosd bid -> hand_array
+; end
+;
+; bubble sort hand_array
+;
+; calc total
+; rank := 1
+; for (_, bid) in hand_array
+;    final_value += rank * bid
+;    rank += 1
+; end
+; 
+; done
+
+_start:
+
+mov esi, file
+mov edi, hand_array
+; for l in lines
+; ...
+; end
+for_in_lines:
+; check for end
+cmp esi, file.over
+jae for_in_lines_end
+; score hand
+; tmp := 0
+xor ebp, ebp ; tmp
+; counts[15] := [0; 15]
+push edi
+mov edi, counts
+mov ecx, 15
+xor eax, eax
+rep stosb
+pop edi
+
+get_hand_score:
+; do 5 times
+; ...
+; end
+mov ecx, 5
+xor ebx, ebx ; char value
+.next_char:
+lodsb
+; if c > '9'
+cmp al, '9'
+jle .is_num
+mov edx, 10
+cmp al, 'T'
+cmove ebx, edx
+mov edx, 11
+cmp al, 'J'
+cmove ebx, edx
+mov edx, 12
+cmp al, 'Q'
+cmove ebx, edx
+mov edx, 13
+cmp al, 'K'
+cmove ebx, edx
+mov edx, 14
+cmp al, 'A'
+cmove ebx, edx
+jmp .add_to_tmp
+.is_num:
+; else val := c - '0'
+sub al, '0'
+movzx ebx, al
+; end
+.add_to_tmp:
+; tmp *= 14
+; tmp += score
+mov eax, ebp
+mov edx, 14
+mul edx
+add eax, ebx
+mov ebp, eax
+; put in counts
+inc byte [counts+ebx]
+loop .next_char
+
+; check hand type
+mov byte [has_five], 0
+mov byte [has_four], 0
+mov byte [has_three], 0
+mov byte [has_two], 0
+; for n in counts
+mov ecx, 15
+push esi ; save line
+mov esi, counts
+check_counts:
+lodsb
+cmp al, 5
+jne .check_4
+inc byte [has_five]
+.check_4:
+cmp al, 4
+jne .check_3
+inc byte [has_four]
+.check_3:
+cmp al, 3
+jne .check_2
+inc byte [has_three]
+.check_2:
+cmp al, 2
+jne .check_cont
+inc byte [has_two]
+.check_cont:
+loop check_counts
+; end
+pop esi ; restore line
+
+cmp byte [has_five], 0
+je .maybe_four
+add ebp, 60000000
+jmp .save
+.maybe_four:
+cmp byte [has_four], 0
+je .maybe_three
+add ebp, 50000000
+jmp .save
+.maybe_three:
+cmp byte [has_three], 0
+je .maybe_twos
+add ebp, 30000000
+.maybe_twos:
+mov cl, byte [has_two]
+cmp cl, 0
+je .save
+mov eax, 10000000/2
+shl eax, cl
+add ebp, eax
+.save:
+; store tmp & bid in array
+mov eax, ebp
+stosd
+inc esi ; skip space
+call dec_parse ; bid
+stosd
+
+for_in_lines_cont:
+jmp for_in_lines
+for_in_lines_end:
+
+; bubble sort hand_array
+bubble_sort:
+; get length (array is null terminated)
+mov esi, hand_array
+xor eax, eax
+get_len:
+cmp dword [esi+eax*8], 0
+je .done
+inc eax
+jmp get_len
+.done:
+mov ebp, eax ; n
+do_sort:
+xor edx, edx ; newn
+mov ecx, 1 ; i
+.inner:
+mov eax, [esi+ecx*8-8] ; A[i-1]
+cmp eax, [esi+ecx*8]   ; A[i]
+jbe .inner_cont
+; swap elements
+xchg eax, [esi+ecx*8]
+mov [esi+ecx*8-8], eax
+mov eax, [esi+ecx*8-4] ; A[i-1] bid
+xchg eax, [esi+ecx*8+4] ; A[i] bid
+mov [esi+ecx*8-4], eax
+mov edx, ecx ; newn
+.inner_cont:
+inc ecx
+cmp ecx, ebp
+jb .inner
+mov ebp, edx ; n := newn
+cmp ebp, 1
+ja do_sort ; until n <= 1
+done_sort:
+
+; calc total
+; rank := 1
+mov ebx, 1
+mov esi, hand_array
+calc_total:
+lodsd ; _
+lodsd ; bid
+test eax, eax
+jz calc_total_done
+mul ebx
+add [final_value], eax
+inc ebx
+jmp calc_total
+calc_total_done:
+
+game_over:
+mov eax, [final_value]
+call print_dec
+jmp exit
+
+[section .data]
+final_value: dd 0
+counts: times 15 db 0
+has_five: db 0
+has_four: db 0
+has_three: db 0
+has_two: db 0
+
+file_lim: dd file.over - file
+file: incbin "input"
+.over:
+
+[section .bss]
+hand_array: resd 4096

07/utils.s

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+;             call #  val  val2
+; int $0x80   eax     eax  edx  -
+;
+; arg1  arg2  arg3  arg4  arg5  arg6  arg7  
+; ebx   ecx   edx   esi   edi   ebp   -
+
+exit:
+mov eax, 1 ; exit
+int 0x80
+
+; filename in EBX
+; return handle in EBX 
+; read only
+open_file:
+push eax
+push ecx
+mov eax, 5 ; open
+xor ecx, ecx ; read only
+int 0x80
+mov ebx, eax
+pop ecx
+pop eax
+ret
+
+; file handle in EBX
+; buffer in ECX
+; count of bytes to read in EDX
+; return bytes actually read in EAX
+; exits on error
+read_file:
+mov eax, 3 ; read
+int 0x80
+test eax, eax
+js .err
+ret
+.err:
+mov eax, 4 ; write
+mov ebx, 1 ; stdout
+mov ecx, .err_str
+mov edx, 21
+int 0x80
+jmp exit
+.err_str: db `Could not read file.\n`
+
+; string input in ESI
+; value in EAX
+; CF set if none, clear if some
+; ESI set past checked area
+dec_parse:
+push ebx
+push edx
+push edi
+xor eax, eax
+xor edi, edi
+mov ebx, 10  ; base
+lodsb
+sub al, '0'
+js .no_input
+cmp al, 9
+jle .got_char
+.no_input:
+stc ; set CF
+jmp .done
+.loop:
+xor eax,eax
+lodsb
+sub al, '0'
+js .dec_done
+cmp al, 9
+jg .dec_done
+.got_char:
+xchg edi,eax
+mul ebx
+add edi,eax
+jmp .loop
+.dec_done:
+clc ; clear CF
+.done:
+mov eax,edi
+pop edi
+pop edx
+pop ebx
+ret
+
+; modifies no regs
+newline:
+pushad
+push 10
+mov eax, 4 ; write
+mov ebx, 1 ; stdout
+mov ecx, esp ; string
+mov edx, 1 ; length
+int 0x80
+add esp, 4
+popad
+ret
+; modifies no regs
+space:
+pushad
+push 9
+mov eax, 4 ; write
+mov ebx, 1 ; stdout
+mov ecx, esp ; string
+mov edx, 1 ; length
+int 0x80
+add esp, 4
+popad
+ret
+
+; input in EAX, all regs unmodified
+print_dec:
+pushad ; save regs
+; max 4294967296 is 10 chars
+; round to nearest 32-bit boundary
+sub esp, 12
+; string in ECX, length in EDX
+lea ecx, [esp+11] ; last possible byte
+; check for 0
+test eax, eax
+jz .zero
+mov ebx, 10 ; base 10
+xor esi, esi ; counter
+.div_shit:
+xor edx, edx
+; divide
+div ebx
+dec ecx ; next char
+inc esi
+; store
+add dl, '0'
+mov byte [ecx], dl
+; check if done
+test eax, eax
+jnz .div_shit ; continue
+mov edx, esi ; counter in edx
+jmp .write
+.zero:
+mov byte [ecx], '0'
+mov edx, 1 ; length
+.write:
+mov eax, 4 ; write
+mov ebx, 1 ; stdout
+int 0x80
+add esp, 12 ; restore stack
+popad ; restore regs
+ret