1 files changed, 102 insertions, 0 deletions
diff --git a/libgo/go/os/dir_gccgo.go b/libgo/go/os/dir_gccgo.go
new file mode 100644
index 0000000000..d811c9fdd8
--- /dev/null
+++ b/libgo/go/os/dir_gccgo.go
@@ -0,0 +1,102 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import (
+	"io"
+	"sync/atomic"
+	"syscall"
+	"unsafe"
+)
+
+//extern opendir
+func libc_opendir(*byte) *syscall.DIR
+
+//extern closedir
+func libc_closedir(*syscall.DIR) int
+
+// FIXME: pathconf returns long, not int.
+//extern pathconf
+func libc_pathconf(*byte, int) int
+
+func clen(n []byte) int {
+	for i := 0; i < len(n); i++ {
+		if n[i] == 0 {
+			return i
+		}
+	}
+	return len(n)
+}
+
+var nameMax int32
+
+func (file *File) readdirnames(n int) (names []string, err error) {
+	if file.dirinfo == nil {
+		p, err := syscall.BytePtrFromString(file.name)
+		if err != nil {
+			return nil, err
+		}
+
+		elen := int(atomic.LoadInt32(&nameMax))
+		if elen == 0 {
+			syscall.Entersyscall()
+			plen := libc_pathconf(p, syscall.PC_NAME_MAX)
+			syscall.Exitsyscall()
+			if plen < 1024 {
+				plen = 1024
+			}
+			var dummy syscall.Dirent
+			elen = int(unsafe.Offsetof(dummy.Name)) + plen + 1
+			atomic.StoreInt32(&nameMax, int32(elen))
+		}
+
+		syscall.Entersyscall()
+		r := libc_opendir(p)
+		errno := syscall.GetErrno()
+		syscall.Exitsyscall()
+		if r == nil {
+			return nil, &PathError{"opendir", file.name, errno}
+		}
+
+		file.dirinfo = new(dirInfo)
+		file.dirinfo.buf = make([]byte, elen)
+		file.dirinfo.dir = r
+	}
+
+	entryDirent := (*syscall.Dirent)(unsafe.Pointer(&file.dirinfo.buf[0]))
+
+	size := n
+	if size <= 0 {
+		size = 100
+		n = -1
+	}
+
+	names = make([]string, 0, size) // Empty with room to grow.
+
+	for n != 0 {
+		var dirent *syscall.Dirent
+		pr := &dirent
+		syscall.Entersyscall()
+		i := libc_readdir_r(file.dirinfo.dir, entryDirent, pr)
+		syscall.Exitsyscall()
+		if i != 0 {
+			return names, NewSyscallError("readdir_r", i)
+		}
+		if dirent == nil {
+			break // EOF
+		}
+		bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
+		var name = string(bytes[0:clen(bytes[:])])
+		if name == "." || name == ".." { // Useless names
+			continue
+		}
+		names = append(names, name)
+		n--
+	}
+	if n >= 0 && len(names) == 0 {
+		return names, io.EOF
+	}
+	return names, nil
+}