89 lines
817 B
NASM
89 lines
817 B
NASM
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extern libz_strlen
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global libz_atoi
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section .text
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libz_atoi:
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mov r8, rdi
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xor r9, r9
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_loopasd23:
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mov r9b, [r8]
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cmp r9, 0 ;check and see if we have reached the end of the string
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jz _exitloopasd12
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sub r9, 48
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mov [r8], r9b
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inc r8
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jmp _loopasd23
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_exitloopasd12:
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call libz_strlen
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mov r8, rax
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mov r11, rax
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add r8, rdi
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dec r8
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push r8
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inc r8
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mov rcx, 1
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_loop2asd12:
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dec r8
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mov al, [r8]
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mul rcx
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mov [r8], al
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mov rax, rcx
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mov r10, 10
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mul r10
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mov rcx, rax
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cmp r8, rdi
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je _exitloop2asd12
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jmp _loop2asd12
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_exitloop2asd12:
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mov r8, rdi
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mov r9, rdi
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inc r9
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_loop3asd12:
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mov r11b, [r9]
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mov r10b, [r8]
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cmp r11, 0
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jz _endasdasd23123
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add r11, r10
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mov [r9], r11b
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mov [r8], r10b
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inc r8
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inc r9
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jmp _loop3asd12
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_endasdasd23123:
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pop r8
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mov rax, [r8]
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ret
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