From cf3b3048da0f80d3643ba0a9bc61a29ca5c5cf8b Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Fri, 10 Sep 2021 20:54:08 -0400
Subject: Test failed Ring allocation

---
 test/failing_allocator.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 test/failing_allocator.c

(limited to 'test/failing_allocator.c')

diff --git a/test/failing_allocator.c b/test/failing_allocator.c
new file mode 100644
index 0000000..bb569de
--- /dev/null
+++ b/test/failing_allocator.c
@@ -0,0 +1,94 @@
+/*
+  Copyright 2021 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "failing_allocator.h"
+
+#include "zix/allocator.h"
+#include "zix/attributes.h"
+
+#include <stdbool.h>
+#include <stddef.h>
+
+static bool
+attempt(ZixFailingAllocatorState* const state)
+{
+  ++state->n_allocations;
+
+  if (!state->n_remaining) {
+    return false;
+  }
+
+  --state->n_remaining;
+  return true;
+}
+
+ZIX_MALLOC_FUNC
+static void*
+zix_failing_malloc(ZixAllocatorHandle* const handle, const size_t size)
+{
+  ZixFailingAllocatorState* const state = (ZixFailingAllocatorState*)handle;
+  const ZixAllocator* const       base  = zix_default_allocator();
+
+  return attempt(state) ? base->malloc(base->handle, size) : NULL;
+}
+
+ZIX_MALLOC_FUNC
+static void*
+zix_failing_calloc(ZixAllocatorHandle* const handle,
+                   const size_t              nmemb,
+                   const size_t              size)
+{
+  ZixFailingAllocatorState* const state = (ZixFailingAllocatorState*)handle;
+  const ZixAllocator* const       base  = zix_default_allocator();
+
+  return attempt(state) ? base->calloc(base->handle, nmemb, size) : NULL;
+}
+
+static void*
+zix_failing_realloc(ZixAllocatorHandle* const handle,
+                    void* const               ptr,
+                    const size_t              size)
+{
+  ZixFailingAllocatorState* const state = (ZixFailingAllocatorState*)handle;
+  const ZixAllocator* const       base  = zix_default_allocator();
+
+  return attempt(state) ? base->realloc(base->handle, ptr, size) : NULL;
+}
+
+static void
+zix_failing_free(ZixAllocatorHandle* const handle, void* const ptr)
+{
+  (void)handle;
+
+  const ZixAllocator* const base = zix_default_allocator();
+
+  base->free(base->handle, ptr);
+}
+
+ZIX_CONST_FUNC
+ZixAllocator
+zix_failing_allocator(ZixFailingAllocatorState* const state)
+{
+  const ZixAllocator failing_allocator = {
+    state,
+    zix_failing_malloc,
+    zix_failing_calloc,
+    zix_failing_realloc,
+    zix_failing_free,
+  };
+
+  return failing_allocator;
+}
-- 
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