/fefe/ – Fefes Kommentarfunktion

>>> f = "Ä" * 128
>>> o = open(f, "w")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 36] File name too long: 'ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ'

#include <string.h>
#include <stdint.h>
#include <uchar.h>
#include <Windows.h>

int main(int argc, char ** argv)
{
    static const size_t fileNameLen = 251; // Ergibt mit ".txt" einen 255-stelligen Dateinamen im lokalen Verzeichnis

    char16_t prefix[] = L"\\\\?\\";
    size_t prefixLen = sizeof(prefix)  sizeof(prefix[0]) - 1;
    char16_t suffix[] = L".txt";
    size_t suffixLen = sizeof(suffix)  sizeof(suffix[0]) - 1;
    char16_t slash = '\\';
    char16_t fileNameChar = u'Ä';

    char16_t * currDir;
    uint32_t bufferLen = GetCurrentDirectory(0, NULL);
    currDir = malloc((bufferLen + 1) * sizeof(char16_t));
    GetCurrentDirectory(bufferLen, currDir);
    size_t currDirLen = bufferLen - 1;

    char16_t * fileName = malloc((prefixLen + currDirLen + 1 + fileNameLen + suffixLen + 1) * sizeof(char16_t));
    char16_t * offset = fileName;

    memcpy(offset, prefix, prefixLen * sizeof(char16_t));
    offset += prefixLen;
    memcpy(offset, currDir, currDirLen * sizeof(char16_t));
    offset += currDirLen;

    *offset = slash;
    offset += 1;

    for(size_t i = 0u; i < fileNameLen; i++)
    {
        *offset = fileNameChar;
        offset += 1;
    }

    memcpy(offset, suffix, suffixLen * sizeof(char16_t));
    offset += suffixLen;

    *offset = 0;

    HANDLE file = CreateFile(fileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    CloseHandle(file);

    free(fileName);
    free(currDir);

    return 0;
}

size_t prefixLen = sizeof(prefix) / sizeof(prefix[0]) - 1;

size_t suffixLen = sizeof(suffix) / sizeof(suffix[0]) - 1;

main:
 push        rsi  
 sub         rsp,40h  
 mov         rax,5C003F005C005Ch  
 mov         qword ptr [fileName],rax  
 lea         rsi,[fileName]  
 lea         rdx,[fileName+8h]  
 mov         ecx,7FFCh  
 call        qword ptr [__imp_GetCurrentDirectoryW]  
 mov         eax,eax  
 mov         word ptr [rsi+rax*2+8],5Ch  
 movaps      xmm0,xmmword ptr [__xmm@00c400c400c400c400c400c400c400c4]  
 movups      xmmword ptr [rsi+rax*2+0Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+1Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+2Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+3Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+4Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+5Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+6Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+7Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+8Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+9Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+0AAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+0BAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+0CAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+0DAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+0EAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+0FAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+10Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+11Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+12Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+13Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+14Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+15Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+16Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+17Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+18Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+19Ah],xmm0  
 movups      xmmword ptr [rsi+rax*2+1AAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+1BAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+1CAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+1DAh],xmm0  
 movups      xmmword ptr [rsi+rax*2+1EAh],xmm0  
 mov         dword ptr [rsi+rax*2+1FAh],0C400C4h  
 mov         word ptr [rsi+rax*2+1FEh],0C4h  
 mov         rcx,7400780074002Eh  
 mov         qword ptr [rsi+rax*2+200h],rcx  
 mov         word ptr [rsi+rax*2+208h],0  
 mov         qword ptr [rsp+30h],0  
 mov         dword ptr [rsp+28h],80h  
 mov         dword ptr [rsp+20h],4  
 mov         rcx,rsi  
 mov         edx,40000000h  
 xor         r8d,r8d  
 xor         r9d,r9d  
 call        qword ptr [__imp_CreateFileW]  
 mov         rcx,rax  
 call        qword ptr [__imp_CloseHandle]  
 xor         eax,eax  
 add         rsp,40h  
 pop         rsi  
 ret

00d0:Call KERNEL32.CreateFileW(007b4130 L"\\\\?\\Z:\\tmp\\\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4
\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4"...,40000000,00000000,00000000,6e5c706d000
00002,65786500000080,00000000) ret=140001527
00d0:Call ntdll.RtlRunOnceExecuteOnce(6fffffca2f90,6fffffc926e0,00000000,00000000) ret=6fffffc47956
00d0:Ret  ntdll.RtlRunOnceExecuteOnce() retval=00000000 ret=6fffffc47956
00d0:Call ntdll.wcscpy(0011f994,6fffffca1574 L"") ret=6fffffc436fa
00d0:Ret  ntdll.wcscpy() retval=0011f994 ret=6fffffc436fa
00d0:Call ntdll.RtlDosPathNameToNtPathName_U(007b4130 L"\\\\?\\Z:\\tmp\\\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4\00c4"...,0011fb60,00000000,00000000) ret=6fffffc23c36
00d0:Ret  ntdll.RtlDosPathNameToNtPathName_U() retval=00000001 ret=6fffffc23c36
00d0:Call ntdll.NtCreateFile(0011fb48,40100080,0011fb80,0011fb70,00000000,00000080,00000000,00000005,00000060,00000000,00000000) ret=6fffffc23d0f
00d0:Ret  ntdll.NtCreateFile() retval=c0000034 ret=6fffffc23d0f
00d0:Call ntdll.RtlNtStatusToDosError(c0000034) ret=6fffffc23f90
00d0:Ret  ntdll.RtlNtStatusToDosError() retval=00000002 ret=6fffffc23f90
00d0:Call ntdll.RtlFreeUnicodeString(0011fb60) ret=6fffffc23edb
00d0:Ret  ntdll.RtlFreeUnicodeString() retval=00000001 ret=6fffffc23edb
00d0:Ret  KERNEL32.CreateFileW() retval=ffffffffffffffff ret=140001527
00d0:Call KERNEL32.CloseHandle(ffffffffffffffff) ret=140001530
00d0:Call ntdll.NtClose(ffffffffffffffff) ret=6fffffc2139b
00d0:Ret  ntdll.NtClose() retval=00000000 ret=6fffffc2139b
00d0:Ret  KERNEL32.CloseHandle() retval=00000001 ret=140001530