* 스트림(stream) → 한 방향으로 흐르는 데이터 흐름
프로그램상에서 모니터와 키보드를 대상으로 데이터를 입출력 하기 위해서는 이들을 연결시켜주는 다리가 필요함
이러한 다리 역할을 하는 매개체를 가리켜 스트림(stream)이라고 함
ㄴ 콘솔 입출력을 위한 입력 스트림과 출력 스트림은
프로그램이 실행되면 자동으로 생성되고,
프로그램이 종료되면 자동으로 소멸되는 스트림이다
* 입출력 함수
문자 출력 함수 : putchar, fputc
문자 입력 함수 : getchar, fgetc
문자열 출력 함수 : puts, fputs
문자열 입력 함수 : gets, fgets
* 입출력 이외의 문자열 관련 함수
문자열의 길이를 반환하는 함수 : strlen
문자열을 복사하는 함수 : strcpy, strncpy
문자열을 덧붙이는 함수 : strcat, strncat
문자열을 비교하는 함수 : strcmp, strncmp
* 그외의 변환 함수들
문자열 → int : atoi
문자열 → long : atol
문자열 → double : atof
#include <stdio.h>
int main(void)
{
00DE17A0 push ebp
00DE17A1 mov ebp,esp
00DE17A3 sub esp,0D8h
00DE17A9 push ebx
00DE17AA push esi
00DE17AB push edi
00DE17AC lea edi,[ebp-18h]
00DE17AF mov ecx,6
00DE17B4 mov eax,0CCCCCCCCh
00DE17B9 rep stos dword ptr es:[edi]
00DE17BB mov ecx,offset _74AEDF8A_ReadWirteChar@c (0DEC008h)
00DE17C0 call @__CheckForDebuggerJustMyCode@4 (0DE132Fh)
00DE17C5 nop
int ch1, ch2;
ch1 = getchar(); // 문자 입력
00DE17C6 mov esi,esp
00DE17C8 call dword ptr [__imp__getchar (0DEB174h)]
00DE17CE cmp esi,esp
00DE17D0 call __RTC_CheckEsp (0DE124Eh)
00DE17D5 mov dword ptr [ch1],eax
ch2 = fgetc(stdin); // 엔터키 입력
00DE17D8 mov esi,esp
00DE17DA push 0
00DE17DC call dword ptr [__imp____acrt_iob_func (0DEB180h)]
00DE17E2 add esp,4
00DE17E5 cmp esi,esp
00DE17E7 call __RTC_CheckEsp (0DE124Eh)
00DE17EC mov esi,esp
00DE17EE push eax
00DE17EF call dword ptr [__imp__fgetc (0DEB17Ch)]
00DE17F5 add esp,4
00DE17F8 cmp esi,esp
00DE17FA call __RTC_CheckEsp (0DE124Eh)
00DE17FF mov dword ptr [ch2],eax
putchar(ch1); // 문자 출력
00DE1802 mov esi,esp
00DE1804 mov eax,dword ptr [ch1]
00DE1807 push eax
00DE1808 call dword ptr [__imp__putchar (0DEB170h)]
00DE180E add esp,4
00DE1811 cmp esi,esp
00DE1813 call __RTC_CheckEsp (0DE124Eh)
00DE1818 nop
fputc(ch2, stdout); // 엔터키 출력
00DE1819 mov esi,esp
00DE181B push 1
00DE181D call dword ptr [__imp____acrt_iob_func (0DEB180h)]
00DE1823 add esp,4
00DE1826 cmp esi,esp
00DE1828 call __RTC_CheckEsp (0DE124Eh)
00DE182D mov esi,esp
00DE182F push eax
00DE1830 mov eax,dword ptr [ch2]
00DE1833 push eax
00DE1834 call dword ptr [__imp__fputc (0DEB178h)]
00DE183A add esp,8
00DE183D cmp esi,esp
00DE183F call __RTC_CheckEsp (0DE124Eh)
00DE1844 nop
return 0;
00DE1845 xor eax,eax
}
00DE1847 pop edi
00DE1848 pop esi
00DE1849 pop ebx
00DE184A add esp,0D8h
00DE1850 cmp ebp,esp
00DE1852 call __RTC_CheckEsp (0DE124Eh)
00DE1857 mov esp,ebp
00DE1859 pop ebp
00DE185A ret
#include <stdio.h>
int main(void)
{
00D91880 push ebp
00D91881 mov ebp,esp
00D91883 sub esp,0CCh
00D91889 push ebx
00D9188A push esi
00D9188B push edi
00D9188C lea edi,[ebp-0Ch]
00D9188F mov ecx,3
00D91894 mov eax,0CCCCCCCCh
00D91899 rep stos dword ptr es:[edi]
00D9189B mov ecx,offset _FFEA8C6C_WirteString@c (0D9C008h)
00D918A0 call @__CheckForDebuggerJustMyCode@4 (0D9132Fh)
00D918A5 nop
char* str = "Simple String";
00D918A6 mov dword ptr [str],offset string "Simple String" (0D97B30h)
printf("1. puts test ------ \n");
00D918AD push offset string "1. puts test ------ \n" (0D97B40h)
00D918B2 call _printf (0D910D7h)
00D918B7 add esp,4
puts(str);
00D918BA mov esi,esp
00D918BC mov eax,dword ptr [str]
00D918BF push eax
00D918C0 call dword ptr [__imp__puts (0D9B174h)]
00D918C6 add esp,4
00D918C9 cmp esi,esp
00D918CB call __RTC_CheckEsp (0D91253h)
00D918D0 nop
puts("So Simple String");
00D918D1 mov esi,esp
00D918D3 push offset string "So Simple String" (0D97B5Ch)
00D918D8 call dword ptr [__imp__puts (0D9B174h)]
00D918DE add esp,4
00D918E1 cmp esi,esp
00D918E3 call __RTC_CheckEsp (0D91253h)
00D918E8 nop
printf("2. puts test ------ \n");
00D918E9 push offset string "2. puts test ------ \n" (0D97B70h)
00D918EE call _printf (0D910D7h)
00D918F3 add esp,4
fputs(str, stdout); printf("\n");
00D918F6 mov esi,esp
00D918F8 push 1
00D918FA call dword ptr [__imp____acrt_iob_func (0D9B17Ch)]
00D91900 add esp,4
00D91903 cmp esi,esp
00D91905 call __RTC_CheckEsp (0D91253h)
00D9190A mov esi,esp
00D9190C push eax
00D9190D mov eax,dword ptr [str]
00D91910 push eax
00D91911 call dword ptr [__imp__fputs (0D9B178h)]
00D91917 add esp,8
00D9191A cmp esi,esp
00D9191C call __RTC_CheckEsp (0D91253h)
00D91921 nop
00D91922 push offset string "\n" (0D97B8Ch)
00D91927 call _printf (0D910D7h)
00D9192C add esp,4
fputs("So Simple String", stdout); printf("\n");
00D9192F mov esi,esp
00D91931 push 1
00D91933 call dword ptr [__imp____acrt_iob_func (0D9B17Ch)]
00D91939 add esp,4
00D9193C cmp esi,esp
00D9193E call __RTC_CheckEsp (0D91253h)
00D91943 mov esi,esp
00D91945 push eax
00D91946 push offset string "So Simple String" (0D97B5Ch)
00D9194B call dword ptr [__imp__fputs (0D9B178h)]
00D91951 add esp,8
00D91954 cmp esi,esp
00D91956 call __RTC_CheckEsp (0D91253h)
00D9195B nop
00D9195C push offset string "\n" (0D97B8Ch)
00D91961 call _printf (0D910D7h)
00D91966 add esp,4
printf("3. end of main ------ \n");
00D91969 push offset string "3. end of main ------ \n" (0D97B90h)
00D9196E call _printf (0D910D7h)
00D91973 add esp,4
return 0;
00D91976 xor eax,eax
}
00D91978 pop edi
00D91979 pop esi
00D9197A pop ebx
00D9197B add esp,0CCh
00D91981 cmp ebp,esp
00D91983 call __RTC_CheckEsp (0D91253h)
00D91988 mov esp,ebp
00D9198A pop ebp
00D9198B ret
#include <stdio.h>
int main(void)
{
00C51870 push ebp
00C51871 mov ebp,esp
00C51873 sub esp,0E0h
00C51879 push ebx
00C5187A push esi
00C5187B push edi
00C5187C lea edi,[ebp-20h]
00C5187F mov ecx,8
00C51884 mov eax,0CCCCCCCCh
00C51889 rep stos dword ptr es:[edi]
00C5188B mov eax,dword ptr [__security_cookie (0C5A000h)]
00C51890 xor eax,ebp
00C51892 mov dword ptr [ebp-4],eax
00C51895 mov ecx,offset _240753C6_ReadString@c (0C5C008h)
00C5189A call @__CheckForDebuggerJustMyCode@4 (0C5132Fh)
00C5189F nop
char str[7];
int i;
for (i = 0; i < 3; i++)
00C518A0 mov dword ptr [i],0
00C518A7 jmp __$EncStackInitStart+36h (0C518B2h)
00C518A9 mov eax,dword ptr [i]
00C518AC add eax,1
00C518AF mov dword ptr [i],eax
00C518B2 cmp dword ptr [i],3
00C518B6 jge __$EncStackInitStart+62h (0C518DEh)
{
//fgets(str, sizeof(str), stdin);
gets(str);
00C518B8 lea eax,[str]
00C518BB push eax
00C518BC call _gets (0C513CAh)
00C518C1 add esp,4
printf("Read %d: %s \n", i + 1, str);
00C518C4 lea eax,[str]
00C518C7 push eax
00C518C8 mov ecx,dword ptr [i]
00C518CB add ecx,1
00C518CE push ecx
00C518CF push offset string "Read %d: %s \n" (0C57B30h)
00C518D4 call _printf (0C510D2h)
00C518D9 add esp,0Ch
}
00C518DC jmp __$EncStackInitStart+2Dh (0C518A9h)
return 0;
00C518DE xor eax,eax
}
00C518E0 push edx
00C518E1 mov ecx,ebp
00C518E3 push eax
00C518E4 lea edx,ds:[0C51910h]
00C518EA call @_RTC_CheckStackVars@8 (0C511EFh)
00C518EF pop eax
00C518F0 pop edx
00C518F1 pop edi
00C518F2 pop esi
00C518F3 pop ebx
00C518F4 mov ecx,dword ptr [ebp-4]
00C518F7 xor ecx,ebp
00C518F9 call @__security_check_cookie@4 (0C51154h)
00C518FE add esp,0E0h
00C51904 cmp ebp,esp
00C51906 call __RTC_CheckEsp (0C51253h)
00C5190B mov esp,ebp
00C5190D pop ebp
00C5190E ret
int main(void)
{
00AE1900 push ebp
00AE1901 mov ebp,esp
00AE1903 sub esp,130h
00AE1909 push ebx
00AE190A push esi
00AE190B push edi
00AE190C lea edi,[ebp-70h]
00AE190F mov ecx,1Ch
00AE1914 mov eax,0CCCCCCCCh
00AE1919 rep stos dword ptr es:[edi]
00AE191B mov eax,dword ptr [__security_cookie (0AEA000h)]
00AE1920 xor eax,ebp
00AE1922 mov dword ptr [ebp-4],eax
00AE1925 mov ecx,offset _728D6715_RemoveBSN@c (0AEC00Eh)
00AE192A call @__CheckForDebuggerJustMyCode@4 (0AE1334h)
00AE192F nop
char str[100];
printf("문자열 입력 : ");
00AE1930 push offset string "\xb9\xae\xc0\xda\xbf\xad \xc0\xd4\xb7\xc2 : " (0AE7B30h)
00AE1935 call _printf (0AE10D2h)
00AE193A add esp,4
fgets(str, sizeof(str), stdin);
00AE193D mov esi,esp
00AE193F push 0
00AE1941 call dword ptr [__imp____acrt_iob_func (0AEB17Ch)]
00AE1947 add esp,4
00AE194A cmp esi,esp
00AE194C call __RTC_CheckEsp (0AE1258h)
00AE1951 mov esi,esp
00AE1953 push eax
00AE1954 push 64h
00AE1956 lea eax,[str]
00AE1959 push eax
00AE195A call dword ptr [__imp__fgets (0AEB178h)]
00AE1960 add esp,0Ch
00AE1963 cmp esi,esp
00AE1965 call __RTC_CheckEsp (0AE1258h)
00AE196A nop
printf("길이 : %d, 내용 : %s\n", strlen(str), str);
00AE196B lea eax,[str]
00AE196E push eax
00AE196F lea ecx,[str]
00AE1972 push ecx
00AE1973 call _strlen (0AE1384h)
00AE1978 add esp,4
00AE197B push eax
00AE197C push offset string "\xb1\xe6\xc0\xcc : %d, \xb3\xbb\xbf\xeb : %s\n" (0AE7B44h)
00AE1981 call _printf (0AE10D2h)
00AE1986 add esp,0Ch
printf("=================\n");
00AE1989 push offset string "=================\n" (0AE7BFCh)
00AE198E call _printf (0AE10D2h)
00AE1993 add esp,4
RemoveBSN(str);
00AE1996 lea eax,[str]
00AE1999 push eax
00AE199A call _RemoveBSN (0AE112Ch)
00AE199F add esp,4
printf("길이 : %d, 내용 : %s\n", strlen(str), str);
00AE19A2 lea eax,[str]
00AE19A5 push eax
00AE19A6 lea ecx,[str]
00AE19A9 push ecx
00AE19AA call _strlen (0AE1384h)
00AE19AF add esp,4
00AE19B2 push eax
00AE19B3 push offset string "\xb1\xe6\xc0\xcc : %d, \xb3\xbb\xbf\xeb : %s\n" (0AE7B44h)
00AE19B8 call _printf (0AE10D2h)
00AE19BD add esp,0Ch
printf("=================\n");
00AE19C0 push offset string "=================\n" (0AE7BFCh)
00AE19C5 call _printf (0AE10D2h)
00AE19CA add esp,4
return 0;
00AE19CD xor eax,eax
}
00AE19CF push edx
00AE19D0 mov ecx,ebp
00AE19D2 push eax
00AE19D3 lea edx,ds:[0AE1A00h]
00AE19D9 call @_RTC_CheckStackVars@8 (0AE11F4h)
00AE19DE pop eax
00AE19DF pop edx
00AE19E0 pop edi
00AE19E1 pop esi
00AE19E2 pop ebx
00AE19E3 mov ecx,dword ptr [ebp-4]
00AE19E6 xor ecx,ebp
00AE19E8 call @__security_check_cookie@4 (0AE1159h)
00AE19ED add esp,130h
00AE19F3 cmp ebp,esp
00AE19F5 call __RTC_CheckEsp (0AE1258h)
00AE19FA mov esp,ebp
00AE19FC pop ebp
00AE19FD ret
strcpy_s, wcscpy_s, _mbscpy_s, _mbscpy_s_l
자세한 정보: strcpy_s, wcscpy_s, _mbscpy_s, _mbscpy_s_l
learn.microsoft.com
strncpy_s, _strncpy_s_l, wcsncpy_s, _wcsncpy_s_l, _mbsncpy_s, _mbsncpy_s_l, _tcsncpy_s, _tcsncpy_s_l, _tcsnccpy_s, _tcsnccpy_s_l
자세한 정보: strncpy_s, _strncpy_s_l, wcsncpy_s, _wcsncpy_s_l, _mbsncpy_s, _mbsncpy_s_l
learn.microsoft.com
errno_t strcpy_s(
char *dest,
rsize_t dest_size,
const char *src
);
errno_t strncpy_s(
char *strDest,
size_t numberOfElements,
const char *strSource,
size_t count
);
strcat_s, wcscat_s, _mbscat_s, _mbscat_s_l
자세한 정보: strcat_s, wcscat_s, _mbscat_s, _mbscat_s_l
learn.microsoft.com
strncat_s, _strncat_s_l, wcsncat_s, _wcsncat_s_l, _mbsncat_s, _mbsncat_s_l
자세한 정보: strncat_s, _strncat_s_l, wcsncat_s, _wcsncat_s_l, _mbsncat_s, _mbsncat_s_l
learn.microsoft.com
errno_t strcat_s(
char *strDestination,
size_t numberOfElements,
const char *strSource
);
errno_t strncat_s(
char *strDest,
size_t numberOfElements,
const char *strSource,
size_t count
);
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