Status DeleteDirectory(const OsPath& path)
{
// note: we have to recursively empty the directory before it can
// be deleted (required by Windows and POSIX rmdir()).
CFileInfos files; DirectoryNames subdirectoryNames;
RETURN_STATUS_IF_ERR(GetDirectoryEntries(path, &files, &subdirectoryNames));
// delete files
for(size_t i = 0; i < files.size(); i++)
{
const OsPath pathname = path / files[i].Name();
errno = 0;
if(wunlink(pathname) != 0)
WARN_RETURN(StatusFromErrno());
}
// recurse over subdirectoryNames
for(size_t i = 0; i < subdirectoryNames.size(); i++)
RETURN_STATUS_IF_ERR(DeleteDirectory(path / subdirectoryNames[i]));
errno = 0;
if(wrmdir(path) != 0)
WARN_RETURN(StatusFromErrno());
return INFO::OK;
}
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);
}
Status ForEachFile(const PIVFS& fs, const VfsPath& startPath, FileCallback cb, uintptr_t cbData, const wchar_t* pattern, size_t flags)
{
// (declare here to avoid reallocations)
CFileInfos files;
DirectoryNames subdirectoryNames;
// (a FIFO queue is more efficient than recursion because it uses less
// stack space and avoids seeks due to breadth-first traversal.)
std::queue<VfsPath> pendingDirectories;
pendingDirectories.push(startPath/"");
while(!pendingDirectories.empty())
{
const VfsPath& path = pendingDirectories.front();
RETURN_STATUS_IF_ERR(fs->GetDirectoryEntries(path, &files, &subdirectoryNames));
for(size_t i = 0; i < files.size(); i++)
{
const CFileInfo fileInfo = files[i];
if(!match_wildcard(fileInfo.Name().string().c_str(), pattern))
continue;
const VfsPath pathname(path / fileInfo.Name()); // (CFileInfo only stores the name)
RETURN_STATUS_IF_ERR(cb(pathname, fileInfo, cbData));
}
if(!(flags & DIR_RECURSIVE))
break;
for(size_t i = 0; i < subdirectoryNames.size(); i++)
pendingDirectories.push(path / subdirectoryNames[i]/"");
pendingDirectories.pop();
}
return INFO::OK;
}
