99 lines
1.5 KiB
NASM
99 lines
1.5 KiB
NASM
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;; Modified from: https://gist.github.com/SplittyDev/8e728627012e57ac0deac196660014fb
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;
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; Routine to convert a 32-bit integer to a string.
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; Registers are preserved.
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;
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; EAX: Source integer
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; EBX: Target address
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; ECX: Base
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;
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; Internal register layout:
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; start:
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; EAX: Source integer
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; ECX: Target address
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; EDX: Base
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; checknegative:
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; EAX: Source integer
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; EBX: Target address (original)
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; ECX: Target address (active)
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; divrem:
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; EAX: Source integer
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; ECX: Target address (active)
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; EDX: Base / Result
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; reverse:
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; EBX: Target address (original)
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; ECX: Target address (active)
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; EDX: Target address (temporary)
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;
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__uitoa:
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.start:
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push ebp
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mov ebp, esp
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push eax
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push ebx
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push ecx
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push edx
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mov eax, [ebp+8]
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mov ecx, [ebp+12]
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mov ebx, [ebp+16]
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mov edx, ecx
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mov ecx, ebx
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;.checknegative:
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; test eax, eax
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; jns .divrem
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; mov byte [ecx], 0x2D
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; inc ecx
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; mov ebx, ecx
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; neg eax
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.divrem:
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push edx
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push ecx
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mov ecx, edx
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xor edx, edx
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div ecx
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mov byte dl, [__itoacvt + edx]
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pop ecx
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mov byte [ecx], dl
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pop edx
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inc ecx
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cmp eax, 0x00
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jne .divrem
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mov byte [ecx], 0x00
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dec ecx
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.reverse:
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cmp ebx, ecx
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jge .end
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mov byte dl, [ebx]
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mov byte al, [ecx]
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mov byte [ebx], al
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mov byte [ecx], dl
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inc ebx
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dec ecx
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jmp .reverse
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.end:
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pop edx
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pop ecx
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pop ebx
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pop eax
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pop ebp
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ret
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;
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; Conversion table for __itoa.
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; Works for bases [2 ... 36].
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;
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__itoacvt:
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db '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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;
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; Buffer to store the result of __itoa in.
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;
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align 64
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__itoabuf32:
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rb 36
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