84 lines
1 KiB
NASM
84 lines
1 KiB
NASM
extern puts
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%include "../inc/length_func.inc"
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section .data
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text db "REEEEEEEEEE",0
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text2 db "REEEEEEErEE",0
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differ db "they differ",0
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notdiffer db "they do not differ",0
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textlength dq 0
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text2length dq 0
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section .text
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global main
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main:
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sub rsp, 8 ;enter
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;below we are getting the length of each string
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;we do this because we dont want to compare with memory that isnt ours
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mov r8, text
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call length_func
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mov [textlength], rax
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mov r8, text2
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call length_func
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mov [text2length], rax
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mov r8, [textlength]
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mov r9, [text2length]
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cmp r8, r9
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jne _differ
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xor rcx, rcx ;we do this to clear garbage in rcx (i have had garbage in it before)
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_loop:
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;loop tings
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mov r8, text
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add r8, rcx
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mov r9, text2
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add r9, rcx
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mov r10b, [r8]
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mov r11b, [r9]
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cmp r10b, r11b
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jne _differ
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cmp r10b, 0
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je _notdiffer
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cmp r11b, 0
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je _notdiffer
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inc rcx
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jmp _loop
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_differ:
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mov rdi, differ
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cld
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call puts
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jmp _end
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_notdiffer:
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mov rdi, notdiffer
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cld
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call puts
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_end:
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add rsp, 8 ;exit
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ret
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