compat: test heap allocation replacements

compat/Makefile.am

@@ -13,9 +13,13 @@ dummy.c:
 
 
 check_PROGRAMS = \
+	test_heap \
 	test_strnstr
 
 TESTS = $(check_PROGRAMS)
+AM_TESTS_ENVIRONMENT = ASAN_OPTIONS="allocator_may_return_null=1"
 
+test_heap_SOURCES = test/heap.c
+test_heap_LDADD = libcompat.la
 test_strnstr_SOURCES = test/strnstr.c
 test_strnstr_LDADD = libcompat.la

compat/test/heap.c

@@ -0,0 +1,105 @@
+/*****************************************************************************
+ * aligned_alloc test case
+ *****************************************************************************
+ * Copyright © 2019 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#include "config.h"
+#undef NDEBUG
+#include <assert.h>
+#include <stdalign.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <errno.h>
+
+struct big_align_struct {
+    long long ll;
+    double d;
+};
+
+/* Supported alignments. Others are undefined (ISO C11 §7.22.3, §J.2). */
+static const size_t alignv[] = {
+    alignof (char),
+    alignof (short),
+    alignof (int),
+    alignof (long),
+    alignof (long long),
+    alignof (float),
+    alignof (double),
+    alignof (struct big_align_struct),
+    alignof (void *),
+    alignof (max_align_t),
+};
+
+static const size_t alignc = sizeof (alignv) / sizeof (alignv[0]);
+
+static void test_posix_memalign(size_t align, size_t size)
+{
+    void *p;
+    int val = posix_memalign(&p, align, size);
+
+    if (align >= sizeof (void *)) {
+        if (val == 0) {
+            assert(((uintptr_t)p & (align - 1)) == 0);
+            free(p);
+        }
+    } else
+        assert(val != 0);
+}
+
+int main(void)
+{
+    void *p;
+
+    /* aligned_alloc() */
+
+    for (size_t i = 0; i < alignc; i++) {
+        size_t align = alignv[i];
+
+        assert((align & (align - 1)) == 0); /* must be a power of two */
+
+        p = aligned_alloc(alignv[i], 0);
+        free(p); /* must free {aligned_,c,m,c,re}alloc() allocations */
+
+        for (size_t j = 0; j < alignc; j++) {
+             size_t size = alignv[j];
+
+             if (size < align)
+                 continue; /* size must be a multiple of alignment */
+
+             p = aligned_alloc(align, size);
+             assert(p != NULL); /* small non-zero bytes allocation */
+             assert(((uintptr_t)p & (align - 1)) == 0);
+             free(p);
+        }
+    }
+
+    /* posix_memalign() */
+
+    for (size_t i = 0; i < 21; i++) {
+        size_t align = (size_t)1 << i;
+
+        test_posix_memalign(align, 0);
+        test_posix_memalign(align, 1);
+        test_posix_memalign(align, align - 1);
+        test_posix_memalign(align, align);
+        test_posix_memalign(align, align * 2);
+    }
+
+    return 0;
+}