132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// +build !windows
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package godirwalk
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import (
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"os"
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"syscall"
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"unsafe"
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)
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// MinimumScratchBufferSize specifies the minimum size of the scratch buffer
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// that ReadDirents, ReadDirnames, Scanner, and Walk will use when reading file
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// entries from the operating system. During program startup it is initialized
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// to the result from calling `os.Getpagesize()` for non Windows environments,
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// and 0 for Windows.
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var MinimumScratchBufferSize = os.Getpagesize()
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func newScratchBuffer() []byte { return make([]byte, MinimumScratchBufferSize) }
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func readDirents(osDirname string, scratchBuffer []byte) ([]*Dirent, error) {
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var entries []*Dirent
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var workBuffer []byte
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dh, err := os.Open(osDirname)
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if err != nil {
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return nil, err
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}
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fd := int(dh.Fd())
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if len(scratchBuffer) < MinimumScratchBufferSize {
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scratchBuffer = newScratchBuffer()
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}
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var sde syscall.Dirent
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for {
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if len(workBuffer) == 0 {
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n, err := syscall.ReadDirent(fd, scratchBuffer)
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// n, err := unix.ReadDirent(fd, scratchBuffer)
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if err != nil {
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if err == syscall.EINTR /* || err == unix.EINTR */ {
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continue
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}
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_ = dh.Close()
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return nil, err
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}
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if n <= 0 { // end of directory: normal exit
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if err = dh.Close(); err != nil {
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return nil, err
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}
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return entries, nil
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}
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workBuffer = scratchBuffer[:n] // trim work buffer to number of bytes read
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}
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copy((*[unsafe.Sizeof(syscall.Dirent{})]byte)(unsafe.Pointer(&sde))[:], workBuffer)
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workBuffer = workBuffer[reclen(&sde):] // advance buffer for next iteration through loop
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if inoFromDirent(&sde) == 0 {
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continue // inode set to 0 indicates an entry that was marked as deleted
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}
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nameSlice := nameFromDirent(&sde)
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nameLength := len(nameSlice)
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if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
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continue
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}
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childName := string(nameSlice)
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mt, err := modeTypeFromDirent(&sde, osDirname, childName)
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if err != nil {
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_ = dh.Close()
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return nil, err
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}
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entries = append(entries, &Dirent{name: childName, path: osDirname, modeType: mt})
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}
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}
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func readDirnames(osDirname string, scratchBuffer []byte) ([]string, error) {
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var entries []string
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var workBuffer []byte
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var sde *syscall.Dirent
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dh, err := os.Open(osDirname)
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if err != nil {
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return nil, err
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}
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fd := int(dh.Fd())
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if len(scratchBuffer) < MinimumScratchBufferSize {
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scratchBuffer = newScratchBuffer()
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}
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for {
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if len(workBuffer) == 0 {
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n, err := syscall.ReadDirent(fd, scratchBuffer)
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// n, err := unix.ReadDirent(fd, scratchBuffer)
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if err != nil {
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if err == syscall.EINTR /* || err == unix.EINTR */ {
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continue
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}
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_ = dh.Close()
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return nil, err
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}
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if n <= 0 { // end of directory: normal exit
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if err = dh.Close(); err != nil {
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return nil, err
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}
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return entries, nil
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}
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workBuffer = scratchBuffer[:n] // trim work buffer to number of bytes read
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}
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sde = (*syscall.Dirent)(unsafe.Pointer(&workBuffer[0])) // point entry to first syscall.Dirent in buffer
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// Handle first entry in the work buffer.
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workBuffer = workBuffer[reclen(sde):] // advance buffer for next iteration through loop
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if inoFromDirent(sde) == 0 {
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continue // inode set to 0 indicates an entry that was marked as deleted
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}
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nameSlice := nameFromDirent(sde)
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nameLength := len(nameSlice)
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if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
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continue
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}
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entries = append(entries, string(nameSlice))
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}
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}
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