diff -r a569148841ff -r efbd59642577 ucx/allocator.c
--- a/ucx/allocator.c	Sun Apr 16 14:12:24 2023 +0200
+++ b/ucx/allocator.c	Fri Apr 21 21:25:32 2023 +0200
@@ -1,7 +1,7 @@
 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
- * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ * 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:
@@ -26,35 +26,97 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "ucx/allocator.h"
-
-#include <stdlib.h>
+#include "cx/allocator.h"
 
-static UcxAllocator default_allocator = {
-    NULL,
-    ucx_default_malloc,
-    ucx_default_calloc,
-    ucx_default_realloc,
-    ucx_default_free
-};
-
-UcxAllocator *ucx_default_allocator() {
-    UcxAllocator *allocator = &default_allocator;
-    return allocator;
-}
-
-void *ucx_default_malloc(void *ignore, size_t n) {
+__attribute__((__malloc__, __alloc_size__(2)))
+static void *cx_malloc_stdlib(
+        __attribute__((__unused__)) void *d,
+        size_t n
+) {
     return malloc(n);
 }
 
-void *ucx_default_calloc(void *ignore, size_t n, size_t size) {
-    return calloc(n, size);
+__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);
 }
 
-void *ucx_default_realloc(void *ignore, void *data, size_t n) {
-    return realloc(data, n);
+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 ucx_default_free(void *ignore, void *data) {
-    free(data);
+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);
+}