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; utils/parse.asm - decimal parsing helper.
section .text
; parse_u64: read decimal digits at [RSI] into RAX, advancing RSI past them.
; Stops on the first non-digit. Clobbers RAX, RDX.
parse_u64:
xor rax, rax
.digit:
mov dl, [rsi]
cmp dl, '0'
jl .done
cmp dl, '9'
jg .done
sub dl, '0'
movzx rdx, dl
imul rax, rax, 10
add rax, rdx
inc rsi
jmp .digit
.done:
ret
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