void NextNumberedFilename(const PIVFS& fs, const VfsPath& pathnameFormat, size_t& nextNumber, VfsPath& nextPathname)
{
// (first call only:) scan directory and set nextNumber according to
// highest matching filename found. this avoids filling "holes" in
// the number series due to deleted files, which could be confusing.
// example: add 1st and 2nd; [exit] delete 1st; [restart]
// add 3rd -> without this measure it would get number 1, not 3.
if(nextNumber == 0)
{
const VfsPath nameFormat = pathnameFormat.Filename();
const VfsPath path = pathnameFormat.Parent()/"";
size_t maxNumber = 0;
CFileInfos files;
fs->GetDirectoryEntries(path, &files, 0);
for(size_t i = 0; i < files.size(); i++)
{
int number;
if(swscanf_s(files[i].Name().string().c_str(), nameFormat.string().c_str(), &number) == 1)
maxNumber = std::max(size_t(number), maxNumber);
}
nextNumber = maxNumber+1;
}
// now increment number until that file doesn't yet exist.
// this is fairly slow, but typically only happens once due
// to scan loop above. (we still need to provide for looping since
// someone may have added files in the meantime)
// we don't bother with binary search - this isn't a bottleneck.
do
{
wchar_t pathnameBuf[PATH_MAX];
swprintf_s(pathnameBuf, ARRAY_SIZE(pathnameBuf), pathnameFormat.string().c_str(), nextNumber++);
nextPathname = pathnameBuf;
}
while(fs->GetFileInfo(nextPathname, 0) == INFO::OK);
}
bool VfsFileExists(const VfsPath& pathname)
{
return g_VFS->GetFileInfo(pathname, 0) == INFO::OK;
}
