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-rw-r--r--tests/test-memrchr.c98
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diff --git a/tests/test-memrchr.c b/tests/test-memrchr.c
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+/*
+ * Copyright (C) 2008-2024 Free Software Foundation, Inc.
+ * Written by Eric Blake and Bruno Haible
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include <string.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (memrchr, void *, (void const *, int, size_t));
+
+#include <stdlib.h>
+
+#include "zerosize-ptr.h"
+#include "macros.h"
+
+/* Work around GCC bug 101494. */
+#if _GL_GNUC_PREREQ (4, 7) && __GNUC__ < 12
+# pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+
+/* Calculating void * + int is not portable, so this wrapper converts
+ to char * to make the tests easier to write. */
+#define MEMRCHR (char *) memrchr
+
+int
+main (void)
+{
+ size_t n = 0x100000;
+ char *input = malloc (n);
+ ASSERT (input);
+
+ input[n - 1] = 'a';
+ input[n - 2] = 'b';
+ memset (input + n - 1026, 'c', 1024);
+ memset (input + 2, 'd', n - 1028);
+ input[1] = 'e';
+ input[0] = 'a';
+
+ /* Basic behavior tests. */
+ ASSERT (MEMRCHR (input, 'a', n) == input + n - 1);
+
+ ASSERT (MEMRCHR (input, 'a', 0) == NULL);
+ void *page_boundary = zerosize_ptr ();
+ if (page_boundary)
+ ASSERT (MEMRCHR (page_boundary, 'a', 0) == NULL);
+
+ ASSERT (MEMRCHR (input, 'b', n) == input + n - 2);
+ ASSERT (MEMRCHR (input, 'c', n) == input + n - 3);
+ ASSERT (MEMRCHR (input, 'd', n) == input + n - 1027);
+
+ ASSERT (MEMRCHR (input, 'a', n - 1) == input);
+ ASSERT (MEMRCHR (input, 'e', n - 1) == input + 1);
+
+ ASSERT (MEMRCHR (input, 'f', n) == NULL);
+ ASSERT (MEMRCHR (input, '\0', n) == NULL);
+
+ /* Check that a very long haystack is handled quickly if the byte is
+ found near the end. */
+ {
+ size_t repeat = 10000;
+ for (; repeat > 0; repeat--)
+ {
+ ASSERT (MEMRCHR (input, 'c', n) == input + n - 3);
+ }
+ }
+
+ /* Alignment tests. */
+ {
+ int i, j;
+ for (i = 0; i < 32; i++)
+ {
+ for (j = 0; j < 256; j++)
+ input[i + j] = j;
+ for (j = 0; j < 256; j++)
+ {
+ ASSERT (MEMRCHR (input + i, j, 256) == input + i + j);
+ }
+ }
+ }
+
+ free (input);
+
+ return test_exit_status;
+}