diff -r 0f4aa9fc75d9 -r 81a4c3a63e65 src/allocator.c
--- a/src/allocator.c	Sun Feb 14 15:37:12 2021 +0100
+++ b/src/allocator.c	Mon Mar 01 22:19:06 2021 +0100
@@ -29,6 +29,7 @@
 #include "cx/allocator.h"
 
 #include <stdlib.h>
+#include <errno.h>
 
 void *cx_malloc_stdlib(void *unused, size_t n) {
     return malloc(n);
@@ -67,6 +68,20 @@
     return allocator->cl->realloc(allocator->data, mem, n);
 }
 
+int cxReallocate(CxAllocator allocator, void **mem, size_t n) {
+    if (mem == NULL) {
+        errno = EINVAL;
+        return 1;
+    }
+    void* nmem = allocator->cl->realloc(allocator->data, *mem, n);
+    if (nmem == NULL) {
+        return 1;
+    } else {
+        *mem = nmem;
+        return 0;
+    }
+}
+
 void *cxCalloc(CxAllocator allocator, size_t nelem, size_t n) {
     return allocator->cl->calloc(allocator->data, nelem, n);
 }