90 lines
1.3 KiB
PHP
90 lines
1.3 KiB
PHP
;; rax contains the integer
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;; rbx contains a pointer to the string buffer
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itoa:
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;; Special case for the number '0'
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cmp rax, 0
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jne .not_zero
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mov byte [rbx], '0'
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mov byte [rbx + 1], 0
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ret
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.not_zero:
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mov rdx, 0
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mov rcx, 100000
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div rcx
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add rax, '0'
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mov [rbx], al
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mov rax, rdx
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mov rdx, 0
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mov rcx, 10000
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div rcx
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add rax, '0'
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mov [rbx + 1], al
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mov rax, rdx
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mov rdx, 0
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mov rcx, 1000
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div rcx
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add rax, '0'
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mov [rbx + 2], al
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mov rax, rdx
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mov rdx, 0
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mov rcx, 100
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div rcx
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add rax, '0'
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mov [rbx + 3], al
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mov rax, rdx
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mov rdx, 0
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mov rcx, 10
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div rcx
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add rax, '0'
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mov byte [rbx + 4], al
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add dl, '0'
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mov byte [rbx + 5], dl
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;; Time to shift everything left
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;; End the current string with a null byte
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mov byte [rbx + 6], 0
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.shift_left_loop:
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cmp byte [rbx], '0'
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jne .done
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mov rcx, rbx
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inc rcx
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mov rdx, [rcx]
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and rdx, 255
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mov [rbx], dx
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inc rcx
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mov rdx, [rcx]
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and rdx, 255
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mov [rbx + 1], dx
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inc rcx
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mov rdx, [rcx]
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and rdx, 255
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mov [rbx + 2], dx
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inc rcx
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mov rdx, [rcx]
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and rdx, 255
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mov [rbx + 3], dx
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inc rcx
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mov rdx, [rcx]
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and rdx, 255
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mov [rbx + 4], dx
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inc rcx
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mov rdx, [rcx]
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and rdx, 255
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mov [rbx + 5], dx
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jmp .shift_left_loop
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.done:
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ret
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