From 960448b6acca5dfa472d8000e1889e58fcc7b789 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 10 Aug 2015 15:46:13 +1000
Subject: [PATCH] posix: add dir wrapper

---
 Makefile.am   |  2 ++
 posix/dir.cpp | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++
 posix/dir.hpp | 66 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 156 insertions(+)
 create mode 100644 posix/dir.cpp
 create mode 100644 posix/dir.hpp

diff --git a/Makefile.am b/Makefile.am
index 08d080ed..6f1ed575 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -261,6 +261,8 @@ UTIL_FILES += 			\
     backtrace_execinfo.cpp	\
     io_posix.cpp		\
     io_posix.hpp		\
+    posix/dir.hpp		\
+    posix/dir.cpp		\
     time_posix.cpp
 endif
 
diff --git a/posix/dir.cpp b/posix/dir.cpp
new file mode 100644
index 00000000..81f39993
--- /dev/null
+++ b/posix/dir.cpp
@@ -0,0 +1,88 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "dir.hpp"
+
+#include "../except.hpp"
+
+using util::posix::dir;
+
+
+///////////////////////////////////////////////////////////////////////////////
+//struct entry {
+//public:
+//    entry (dirent *_handle, DIR *_parent): m_handle (_handle), m_parent (_parent) { ; }
+//
+//    const char* name (void) const { return m_handle->d_name; }
+//
+//    entry& operator++ (void) {
+//        dirent *next = readdir (m_parent);
+//        assert (!next || next != m_handle);
+//        m_handle = next;
+//        return *this;
+//    }
+//
+//    entry& operator* (void) { return *this; }
+//    const entry& operator* (void) const;
+//    bool operator!= (entry rhs) const { return m_handle != rhs.m_handle || m_parent != rhs.m_parent; }
+//
+//    struct dirent *m_handle;
+//    DIR *m_parent;
+//};
+
+
+///////////////////////////////////////////////////////////////////////////////
+dir::dir (const char *path):
+    m_handle (opendir (path))
+{
+    if (!m_handle)
+        errno_error::throw_code ();
+}
+
+
+//-----------------------------------------------------------------------------
+dir::~dir ()
+{
+    errno_error::try_code (closedir (m_handle));
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+dir::operator DIR* (void)
+{
+    return m_handle;
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+void
+dir::scan(std::function<void(const char*)> cb)
+{
+    rewind ();
+
+    for (dirent *cursor; errno = 0, cursor = readdir (m_handle); )
+        cb (cursor->d_name);
+
+    errno_error::try_code ();
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+void
+dir::rewind (void)
+{
+    rewinddir (m_handle);
+}
diff --git a/posix/dir.hpp b/posix/dir.hpp
new file mode 100644
index 00000000..a9db1c18
--- /dev/null
+++ b/posix/dir.hpp
@@ -0,0 +1,66 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_POSIX_DIR_HPP
+#define __UTIL_POSIX_DIR_HPP
+
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <functional>
+
+namespace util { namespace posix {
+    //struct entry {
+    //public:
+    //    entry (dirent *_handle, DIR *_parent): m_handle (_handle), m_parent (_parent) { ; }
+
+    //    const char* name (void) const { return m_handle->d_name; }
+
+    //    entry& operator++ (void) {
+    //        dirent *next = readdir (m_parent);
+    //        assert (!next || next != m_handle);
+    //        m_handle = next;
+    //        return *this;
+    //    }
+
+    //    entry& operator* (void) { return *this; }
+    //    const entry& operator* (void) const;
+    //    bool operator!= (entry rhs) const { return m_handle != rhs.m_handle || m_parent != rhs.m_parent; }
+
+    //    struct dirent *m_handle;
+    //    DIR *m_parent;
+    //};
+
+    struct dir {
+    public:
+        dir (const char *path);
+        ~dir ();
+
+        operator DIR* (void);
+
+        void scan (std::function<void(const char*)>);
+
+        //entry begin (void) { rewind (); return { readdir (m_handle), m_handle }; }
+        //entry end (void) { return { nullptr, m_handle }; }
+
+        void rewind (void);
+
+    private:
+        DIR *m_handle;
+    };
+} }
+
+#endif