Use wrappers for malloc() and calloc().

They will come handy for putting lib9p in the kernel.

lib9p_impl.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted providing that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LIB9P_LIB9P_IMPL_H
+#define LIB9P_LIB9P_IMPL_H
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef _KERNEL
+static inline void *
+l9p_malloc(size_t size)
+{
+	void *r = malloc(size);
+	
+	if (r == NULL) {
+		fprintf(stderr, "cannot allocate %zd bytes: out of memory\n",
+		    size);
+		abort();
+	}
+	
+	return (r);
+}
+
+static inline void *
+l9p_calloc(size_t n, size_t size)
+{
+	void *r = calloc(n, size);
+	
+	if (r == NULL) {
+		fprintf(stderr, "cannot allocate %zd bytes: out of memory\n",
+		    n * size);
+		abort();
+	}
+	
+	return (r);
+}
+#endif /* _KERNEL */
+
+#endif /* LIB9P_LIB9P_IMPL_H */