diff -r e79a60b3a7cb -r 7c3ff86ee9d4 ucx/allocator.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/allocator.c	Tue May 23 11:11:28 2023 +0200
@@ -0,0 +1,122 @@
+/*
+ * 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.
+ */
+
+#include "cx/allocator.h"
+
+__attribute__((__malloc__, __alloc_size__(2)))
+static void *cx_malloc_stdlib(
+        __attribute__((__unused__)) void *d,
+        size_t n
+) {
+    return malloc(n);
+}
+
+__attribute__((__warn_unused_result__, __alloc_size__(3)))
+static void *cx_realloc_stdlib(
+        __attribute__((__unused__)) void *d,
+        void *mem,
+        size_t n
+) {
+    return realloc(mem, n);
+}
+
+__attribute__((__malloc__, __alloc_size__(2, 3)))
+static void *cx_calloc_stdlib(
+        __attribute__((__unused__)) void *d,
+        size_t nelem,
+        size_t n
+) {
+    return calloc(nelem, n);
+}
+
+__attribute__((__nonnull__))
+static void cx_free_stdlib(
+        __attribute__((__unused__)) void *d,
+        void *mem
+) {
+    free(mem);
+}
+
+static cx_allocator_class cx_default_allocator_class = {
+        cx_malloc_stdlib,
+        cx_realloc_stdlib,
+        cx_calloc_stdlib,
+        cx_free_stdlib
+};
+
+struct cx_allocator_s cx_default_allocator = {
+        &cx_default_allocator_class,
+        NULL
+};
+CxAllocator *cxDefaultAllocator = &cx_default_allocator;
+
+// IMPLEMENTATION OF HIGH LEVEL API
+
+void *cxMalloc(
+        CxAllocator const *allocator,
+        size_t n
+) {
+    return allocator->cl->malloc(allocator->data, n);
+}
+
+void *cxRealloc(
+        CxAllocator const *allocator,
+        void *mem,
+        size_t n
+) {
+    return allocator->cl->realloc(allocator->data, mem, n);
+}
+
+int cxReallocate(
+        CxAllocator const *allocator,
+        void **mem,
+        size_t n
+) {
+    void *nmem = allocator->cl->realloc(allocator->data, *mem, n);
+    if (nmem == NULL) {
+        return 1;
+    } else {
+        *mem = nmem;
+        return 0;
+    }
+}
+
+void *cxCalloc(
+        CxAllocator const *allocator,
+        size_t nelem,
+        size_t n
+) {
+    return allocator->cl->calloc(allocator->data, nelem, n);
+}
+
+void cxFree(
+        CxAllocator const *allocator,
+        void *mem
+) {
+    allocator->cl->free(allocator->data, mem);
+}