diff -r d345541018fa -r f094a53c1178 src/cx/allocator.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cx/allocator.h	Sun Feb 07 12:20:07 2021 +0100
@@ -0,0 +1,61 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 UCX_ALLOCATOR_H
+#define UCX_ALLOCATOR_H
+
+#include <stdlib.h>
+
+typedef void* cx_allocator;
+typedef void*(*cx_malloc_func)(cx_allocator a, size_t n);
+typedef void*(*cx_realloc_func)(cx_allocator a, void* mem, size_t n);
+typedef void*(*cx_calloc_func)(cx_allocator a, size_t nelem, size_t n);
+typedef void(*cx_free_func)(cx_allocator a, void* mem);
+
+void* cx_malloc_stdlib(cx_allocator a, size_t n);
+void* cx_realloc_stdlib(cx_allocator a, void* mem, size_t n);
+void* cx_calloc_stdlib(cx_allocator a, size_t nelem, size_t n);
+void cx_free_stdlib(cx_allocator a, void* mem);
+
+struct cx_allocator_s {
+    cx_malloc_func malloc;
+    cx_realloc_func realloc;
+    cx_calloc_func calloc;
+    cx_free_func free;
+    void* data;
+};
+typedef struct cx_allocator_s* CxAllocator;
+
+extern CxAllocator cxDefaultAllocator;
+
+#define cxMalloc(a, n) (a)->malloc((a), n)
+#define cxRealloc(a, mem, n) (a)->realloc((a), mem, n)
+#define cxCalloc(a, nelem, n) (a)->calloc((a), nelem, n)
+#define cxFree(a, mem) (a)->free((a), mem)
+
+#endif //UCX_ALLOCATOR_H