8일차, malloc, strcmp

http://msdn.microsoft.com/ko-kr/library/e0z9k731(v=VS.80).aspx

int strcmp(

   const char *string1,

   const char *string2 

);

-----------------------------3-5

MOV DWORD PTR SS:[EBP-4],0

PUSH 0                              ; /Style = MB_OK|MB_APPLMODAL

PUSH 03_05_Qu.00405030              ; |Title = "ITBANK"

PUSH 03_05_Qu.00405038              ; |Text = "Insert Argument"

PUSH 0                              ; |hOwner = NULL

CALL DWORD PTR DS:[<&USER32.Message>; \MessageBoxA

MOV DWORD PTR SS:[EBP-8],0          ;  i=0

JMP SHORT 03_05_Qu.0040103A

/MOV EAX,DWORD PTR SS:[EBP-8]

|ADD EAX,1

|MOV DWORD PTR SS:[EBP-8],EAX       ;  i++

 MOV ECX,DWORD PTR SS:[EBP+10]      ;  ECX=lpcmd

|ADD ECX,DWORD PTR SS:[EBP-8]

|MOVSX EDX,BYTE PTR DS:[ECX]        ;  for(i=0,lcmd(i)!=0,i++){}

|TEST EDX,EDX

|JE SHORT 03_05_Qu.00401049         ;  EAX=반복횟수

\JMP SHORT 03_05_Qu.00401031

/MOV EAX,DWORD PTR SS:[EBP-4]       ;  j=EBP-4

|CMP EAX,DWORD PTR SS:[EBP-8]       ;  while(j < i){

|JGE SHORT 03_05_Qu.00401080

|MOV ECX,DWORD PTR SS:[EBP+10]

|ADD ECX,DWORD PTR SS:[EBP-4]       ;  lpcmd=lpcmd+ j

|MOVSX EDX,BYTE PTR DS:[ECX]        ;  *(lpcmd+ j)

|MOV EAX,DWORD PTR SS:[EBP-C]

|LEA ECX,DWORD PTR DS:[EAX+EDX-2F]  ;  ECX=*[EBP-C+*(lpcmd+j)-2F]

|MOV DWORD PTR SS:[EBP-C],ECX       ;  EBP_C=[EAX+EDX-2F]

|MOV EDX,DWORD PTR SS:[EBP-4]

|ADD EDX,1

|MOV DWORD PTR SS:[EBP-4],EDX       ;  j=j+1

|MOV EAX,DWORD PTR SS:[EBP-4]

|CMP EAX,DWORD PTR SS:[EBP-8]       ;  if(j < i)

|JGE SHORT 03_05_Qu.0040107E

|MOV ECX,DWORD PTR SS:[EBP-C]       ;  ECX=EBP-C

|IMUL ECX,ECX,0A                    ;  ECX=ECX*16

|MOV DWORD PTR SS:[EBP-C],ECX       ;  EBP-C=ECX

\JMP SHORT 03_05_Qu.00401049        ;  }

MOV EDX,DWORD PTR SS:[EBP-C]

ADD EDX,54

CMP EDX,12C

-----------------------------3-6 malloc, new

heap영역을 가리키는 stack영역의 포인터주소가 바뀌면 힙은 계속남음

서버 망함

malloc free, new delete로 꼭 지워줘야한다.

MOV DWORD PTR SS:[EBP-8],0        ;  int len =0

JMP SHORT 03_06_Qu.0040102C

/MOV EAX,DWORD PTR SS:[EBP-8]

|ADD EAX,1

|MOV DWORD PTR SS:[EBP-8],EAX     ;  len++

 MOV ECX,DWORD PTR SS:[EBP+10]

|ADD ECX,DWORD PTR SS:[EBP-8]

|MOVSX EDX,BYTE PTR DS:[ECX]

|TEST EDX,EDX                     ;  for(len=0, lpCmd[len], len++)

|JE SHORT 03_06_Qu.0040103B

\JMP SHORT 03_06_Qu.00401023

MOV EAX,DWORD PTR SS:[EBP-8]      ;  malloc(len+1)

ADD EAX,1                         ;  EAX = len + 1

PUSH EAX

CALL 03_06_Qu.00401093            ;  name = new * char[len+1]

ADD ESP,4

MOV DWORD PTR SS:[EBP-C],EAX      ;  EAX=리턴값

MOV ECX,DWORD PTR SS:[EBP-C]      ;  ECX=EAX

MOV DWORD PTR SS:[EBP-4],ECX      ;  리턴값(2)--윈도우가 알아서 지울때 사용

MOV DWORD PTR SS:[EBP-8],0

/MOV EDX,DWORD PTR SS:[EBP+10]

|ADD EDX,DWORD PTR SS:[EBP-8]

|MOVSX EAX,BYTE PTR DS:[EDX]

|TEST EAX,EAX

|JE SHORT 03_06_Qu.00401082       ;  while(lpCmd[i])

|MOV ECX,DWORD PTR SS:[EBP-4]     ;  ECX=name

|ADD ECX,DWORD PTR SS:[EBP-8]     ;  name+i

|MOV EDX,DWORD PTR SS:[EBP+10]

|ADD EDX,DWORD PTR SS:[EBP-8]     ;  lpcmd[i]

|MOV AL,BYTE PTR DS:[EDX]

|MOV BYTE PTR DS:[ECX],AL

|MOV ECX,DWORD PTR SS:[EBP-8]

|ADD ECX,1

|MOV DWORD PTR SS:[EBP-8],ECX     ;  i++

\JMP SHORT 03_06_Qu.0040105A

MOV EDX,DWORD PTR SS:[EBP-4]      ;  call한 위치에서는 형태를 확인못하고 사용하는곳에서만 확인가능

ADD EDX,DWORD PTR SS:[EBP-8]

MOV BYTE PTR DS:[EDX],0

-------------------------------

3-7 strcmp