PVS-Studio warning V541 for Pcsx2

void ListPatches (HWND hW) {
  ...
  while((tmpi=fgetc(fp)) != EOF)
    sprintf(fileData,"%s%c",fileData,tmpi);
  ...
  sprintf(tmpStr,"%s (%s)",tmpStr,FindData.cFileName);
  ...
}

The code might work, but this is a dangerous game.

This suspicious code was found in Pcsx2 project by PVS-Studio static code analyzer.
Warning message is:
V541 It is dangerous to print the string 'fileData' into itself. pcsx2 patchbrowser.cpp 211

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/