Handle alloca properly

This adds missing includes for alloca. The man page of alloca(3) states
that alloca.h should be #include'd to use alloca.

Also work around missing alloca.h header on Windows by adding a
compatibility module.

Closes: #197

common/JackNetOneDriver.cpp

@@ -1,4 +1,5 @@
 /*
+Copyright (C) 2018 Karl Linden <karl.j.linden@gmail.com>
 Copyright (C) 2008-2011 Torben Horn
 
 This program is free software; you can redistribute it and/or modify
@@ -16,9 +17,7 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-#ifdef WIN32
-#include <malloc.h>
-#endif
+#include <alloca.h>
 
 #include "JackNetOneDriver.h"
 #include "JackEngineControl.h"

common/netjack.c

@@ -3,6 +3,7 @@
 /*
 NetJack Abstraction.
 
+Copyright (C) 2018 Karl Linden <karl.j.linden@gmail.com>
 Copyright (C) 2008 Pieter Palmers <pieterpalmers@users.sourceforge.net>
 Copyright (C) 2006 Torben Hohn <torbenh@gmx.de>
 Copyright (C) 2003 Robert Ham <rah@bash.sh>
@@ -25,6 +26,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 $Id: net_driver.c,v 1.17 2006/04/16 20:16:10 torbenh Exp $
 */
 
+#include <alloca.h>
 #include <math.h>
 #include <stdio.h>
 #include <memory.h>

common/netjack_packet.c

@@ -4,6 +4,7 @@
  *
  * used by the driver and the jacknet_client
  *
+ * Copyright (C) 2019 Karl Linden <karl.j.linden@gmail.com>
  * Copyright (C) 2008 Marc-Olivier Barre <marco@marcochapeau.org>
  * Copyright (C) 2008 Pieter Palmers <pieterpalmers@users.sourceforge.net>
  * Copyright (C) 2006 Torben Hohn <torbenh@gmx.de>
@@ -38,6 +39,7 @@
 #define _GNU_SOURCE
 #endif
 
+#include <alloca.h>
 #include <math.h>
 #include <stdio.h>
 #include <memory.h>

compat/alloca/README.md

@@ -0,0 +1,7 @@
+# Compatibility Module for alloca
+
+This module contains a replacement header for alloca. To use this module
+simply make sure to `#include <alloca.h>` in the file where alloca
+should be used. If the header is missing the path to the replacement
+header is added to the global include paths, so nothing more needs to be
+done.

compat/alloca/alloca.h

@@ -0,0 +1,34 @@
+/*
+ * alloca.h
+ *
+ * Replacement header for systems lacking the alloca.h header required
+ * to use the alloca function.
+ *
+ * Copyright (C) 2018 Karl Linden <karl.j.linden@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ *
+ */
+
+#ifndef ALLOCA_H
+# define ALLOCA_H
+
+# if _MSC_VER
+#  include <malloc.h>
+#  define alloca _alloca
+# endif /* _MSC_VER */
+
+#endif /* !ALLOCA_H */

compat/alloca/wscript

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+# encoding: utf-8
+#
+# Copyright (C) 2018 Karl Linden <karl.j.linden@gmail.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+
+from waflib import Errors
+
+def options(opt):
+    pass
+
+def configure(conf):
+    try:
+        conf.check(header_name='alloca.h')
+    except Errors.ConfigurationError:
+        conf.env.append_unique('INCLUDES', conf.path.abspath())
+
+def build(bld):
+    pass

example-clients/alsa_out.c

@@ -4,6 +4,7 @@
  * as they would be used by many applications.
  */
 
+#include <alloca.h>
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>

example-clients/session_notify.c

@@ -1,6 +1,7 @@
 /*
  *  session_notify.c -- ultra minimal session manager
  *
+ *  Copyright (C) 2018 Karl Linden <karl.j.linden@gmail.com>
  *  Copyright (C) 2010 Torben Hohn.
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -18,6 +19,7 @@
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <alloca.h>
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>