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readdir_unix.go
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readdir_unix.go
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// +build !windows
package godirwalk
import (
"os"
"syscall"
"unsafe"
)
func readdirents(osDirname string, scratchBuffer []byte) (Dirents, error) {
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
fd := int(dh.Fd())
if len(scratchBuffer) < MinimumScratchBufferSize {
scratchBuffer = make([]byte, DefaultScratchBufferSize)
}
var entries Dirents
var de *syscall.Dirent
for {
n, err := syscall.ReadDirent(fd, scratchBuffer)
if err != nil {
_ = dh.Close() // ignore potential error returned by Close
return nil, err
}
if n <= 0 {
break // end of directory reached
}
// Loop over the bytes returned by reading the directory entries.
buf := scratchBuffer[:n]
for len(buf) > 0 {
de = (*syscall.Dirent)(unsafe.Pointer(&buf[0])) // point entry to first syscall.Dirent in buffer
buf = buf[de.Reclen:] // advance buffer for next iteration through loop
if inoFromDirent(de) == 0 {
continue // this item has been deleted, but its entry not yet removed from directory listing
}
nameSlice := nameFromDirent(de)
namlen := len(nameSlice)
if (namlen == 0) || (namlen == 1 && nameSlice[0] == '.') || (namlen == 2 && nameSlice[0] == '.' && nameSlice[1] == '.') {
continue // skip unimportant entries
}
osChildname := string(nameSlice)
mode, err := modeType(de, osDirname, osChildname)
if err != nil {
_ = dh.Close() // ignore potential error returned by Close
return nil, err
}
entries = append(entries, &Dirent{name: osChildname, modeType: mode})
}
}
if err = dh.Close(); err != nil {
return nil, err
}
return entries, nil
}
func readdirnames(osDirname string, scratchBuffer []byte) ([]string, error) {
dh, err := os.Open(osDirname)
if err != nil {
return nil, err
}
fd := int(dh.Fd())
if len(scratchBuffer) < MinimumScratchBufferSize {
scratchBuffer = make([]byte, DefaultScratchBufferSize)
}
var entries []string
var de *syscall.Dirent
for {
n, err := syscall.ReadDirent(fd, scratchBuffer)
if err != nil {
_ = dh.Close() // ignore potential error returned by Close
return nil, err
}
if n <= 0 {
break // end of directory reached
}
// Loop over the bytes returned by reading the directory entries.
buf := scratchBuffer[:n]
for len(buf) > 0 {
de = (*syscall.Dirent)(unsafe.Pointer(&buf[0])) // point entry to first syscall.Dirent in buffer
buf = buf[de.Reclen:] // advance buffer for next iteration through loop
if inoFromDirent(de) == 0 {
continue // this item has been deleted, but its entry not yet removed from directory listing
}
nameSlice := nameFromDirent(de)
namlen := len(nameSlice)
if (namlen == 0) || (namlen == 1 && nameSlice[0] == '.') || (namlen == 2 && nameSlice[0] == '.' && nameSlice[1] == '.') {
continue // skip unimportant entries
}
osChildname := string(nameSlice)
entries = append(entries, osChildname)
}
}
if err = dh.Close(); err != nil {
return nil, err
}
return entries, nil
}