nss: Add tests for the nss_hash in nss_hash.h

If we want to further optimize the function tests are needed.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/nss/simple-nss-hash.h b/nss/simple-nss-hash.h
new file mode 100644
index 0000000000..47708972e7
--- /dev/null
+++ b/nss/simple-nss-hash.h
@@ -0,0 +1,42 @@
+/* __simple_nss_hash for testing nss_hash function
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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.
+
+   The GNU C Library 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 the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SIMPLE_NSS_HASH_H
+#define _SIMPLE_NSS_HASH_H 1
+
+#include <stdint.h>
+
+/* For testing/benchmarking purposes.  Real implementation in
+   nss/nss_hash.c.  */
+static uint32_t
+__attribute__ ((unused))
+__simple_nss_hash (const void *keyarg, size_t len)
+{
+  const unsigned char *key;
+  size_t i;
+  uint32_t h = 0;
+  key = keyarg;
+
+  for (i = 0; i < len; ++i)
+    h = *key++ + 65599 * h;
+
+  return h;
+}
+
+
+#endif /* simple-nss-hash.h */