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Rev 5023 Rev 5036
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  .invalid_pointer:
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  .invalid_pointer:
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  pop   ecx ebx
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  pop   ecx ebx
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	ret
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	ret
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linkedlist_isvalid:       ;eax - pointer to check; returns zero if valid
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    inc   ecx
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    test  eax, eax
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    jz    .valid_pointer  ;actually, poiner is not valid
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linkedlist_isvalid:       ;eax - pointer to check; returns zero if valid
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    push  ebx ecx
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    push  ebx ecx
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    xor   ecx, ecx
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    test  eax, eax
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    xor   ecx, ecx
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    jz    .invalid_pointer
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    mov   ebx, [head]
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    mov   ebx, [head]
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  .next_check:
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  .next_check:
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    cmp   eax, ebx
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    cmp   eax, ebx
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    jz    .valid_pointer
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    jz    .valid_pointer