library: initial wrapper

Makefile.am

@@ -121,6 +121,7 @@ UTIL_FILES   =			\
     json/schema.hpp		\
     json/tree.cpp		\
     json/tree.hpp		\
+    library.hpp			\
     log.cpp			\
     log.hpp			\
     log.ipp			\
@@ -267,6 +268,8 @@ UTIL_FILES += 			\
     backtrace_execinfo.cpp	\
     io_posix.cpp		\
     io_posix.hpp		\
+    library_posix.hpp		\
+    library_posix.cpp		\
     posix/dir.hpp		\
     posix/dir.cpp		\
     threads/barrier_posix.cpp	\
@@ -282,6 +285,8 @@ if PLATFORM_WIN32
 UTIL_FILES += 			\
     backtrace_null.cpp		\
     io_win32.cpp		\
+    library_win32.hpp		\
+    library_win32.cpp		\
     threads/mutex_win32.cpp	\
     threads/mutex_win32.hpp	\
     threads/thread_win32.hpp	\

library.hpp

@@ -0,0 +1,28 @@
+/*
+ * 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_LIBRARY_HPP
+#define __UTIL_LIBRARY_HPP
+
+#include "platform.hpp"
+
+#if defined(PLATFORM_LINUX)
+#include "library_posix.hpp"
+#elif defined(PLATFORM_WIN32)
+#include "library_win32.hpp"
+#endif
+
+#endif

library_posix.cpp

@@ -0,0 +1,62 @@
+/*
+ * 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 "library_posix.hpp"
+
+#include <dlfcn.h>
+#include <stdexcept>
+
+
+using util::detail::library_posix;
+
+
+///////////////////////////////////////////////////////////////////////////////
+library_posix::library_posix (const std::string &path):
+    library_posix (path.c_str ())
+{ ; }
+
+
+//-----------------------------------------------------------------------------
+library_posix::library_posix (const char *path):
+    m_handle (dlopen (path, RTLD_NOW))
+{
+    if (!m_handle)
+        throw std::runtime_error (dlerror ());
+}
+
+
+//-----------------------------------------------------------------------------
+library_posix::library_posix (library_posix &&rhs):
+    m_handle (nullptr)
+{
+    std::swap (m_handle, rhs.m_handle);
+}
+
+
+//-----------------------------------------------------------------------------
+library_posix::~library_posix ()
+{
+    if (m_handle)
+        dlclose (m_handle);
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+void*
+library_posix::symbol (const char *name)
+{
+    return dlsym (m_handle, name);
+}

library_posix.hpp

@@ -0,0 +1,45 @@
+/*
+ * 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_LIBRARY_POSIX_HPP
+#define __UTIL_LIBRARY_POSIX_HPP
+
+#include <string>
+
+namespace util {
+    namespace detail {
+        class library_posix {
+        public:
+            library_posix (const char *path);
+            library_posix (const std::string &path);
+            library_posix (library_posix&&);
+            ~library_posix ();
+
+            library_posix (const library_posix&) = delete;
+            library_posix& operator= (const library_posix&) = delete;
+
+            void* symbol (const char *name);
+
+        private:
+            void *m_handle;
+
+        };
+    }
+
+    typedef detail::library_posix library;
+}
+
+#endif

library_win32.cpp

@@ -0,0 +1,45 @@
+/*
+ * 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 "library_win32.hpp"
+
+#include "except.hpp"
+
+using util::detail::win32::library;
+
+
+///////////////////////////////////////////////////////////////////////////////
+library::library (const char *path):
+    m_handle (LoadLibraryA (path))
+{
+    if (!m_handle)
+        win32_error::throw_code ();
+}
+
+
+//-----------------------------------------------------------------------------
+library::~library ()
+{
+    FreeLibrary (m_handle);
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+void*
+library::symbol (const char *name)
+{
+    return reinterpret_cast<void*> (GetProcAddress (m_handle, name));
+}

library_win32.hpp

@@ -0,0 +1,41 @@
+/*
+ * 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_LIBRARY_WIN32_HPP
+#define __UTIL_LIBRARY_WIN32_HPP
+
+#include <string>
+#include <windows.h>
+
+namespace util {
+    namespace detail { namespace win32 {
+        class library {
+        public:
+            library (const char *path);
+            library (const std::string &path);
+            ~library ();
+
+            void* symbol (const char *name);
+
+        private:
+            HMODULE m_handle;
+        };
+    } }
+
+    typedef detail::win32::library library;
+}
+
+#endif