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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>
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@ -62,6 +62,7 @@ tests := \
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test-digits-dots \
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test-netdb \
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tst-nss-getpwent \
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tst-nss-hash \
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tst-nss-test1 \
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tst-nss-test2 \
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tst-nss-test4 \
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@ -75,4 +75,5 @@ __nss_hash (const void *keyarg, size_t len)
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return h;
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}
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libc_hidden_def (__nss_hash)
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42
nss/simple-nss-hash.h
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42
nss/simple-nss-hash.h
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@ -0,0 +1,42 @@
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/* __simple_nss_hash for testing nss_hash function
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SIMPLE_NSS_HASH_H
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#define _SIMPLE_NSS_HASH_H 1
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#include <stdint.h>
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/* For testing/benchmarking purposes. Real implementation in
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nss/nss_hash.c. */
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static uint32_t
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__attribute__ ((unused))
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__simple_nss_hash (const void *keyarg, size_t len)
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{
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const unsigned char *key;
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size_t i;
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uint32_t h = 0;
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key = keyarg;
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for (i = 0; i < len; ++i)
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h = *key++ + 65599 * h;
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return h;
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}
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#endif /* simple-nss-hash.h */
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80
nss/tst-nss-hash.c
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80
nss/tst-nss-hash.c
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@ -0,0 +1,80 @@
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/* Test __nss_hash
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/support.h>
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#include <support/check.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <nss.h>
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#include <simple-nss-hash.h>
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uint32_t __nss_hash (const void *__key, size_t __length);
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static int
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do_fill_tests (size_t len, int fill)
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{
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uint32_t expec, res;
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char buf[len];
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memset (buf, fill, len);
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expec = __simple_nss_hash (buf, len);
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res = __nss_hash (buf, len);
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if (expec != res)
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FAIL_EXIT1 ("FAIL: fill(%d) (%zu), %x != %x\n", fill, len, expec, res);
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return 0;
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}
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static int
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do_rand_tests (size_t len)
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{
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uint32_t expec, res;
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size_t i;
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char buf[len];
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for (i = 0; i < len; ++i)
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buf[i] = random ();
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expec = __simple_nss_hash (buf, len);
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res = __nss_hash (buf, len);
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if (expec != res)
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FAIL_EXIT1 ("FAIL: random (%zu), %x != %x\n", len, expec, res);
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return 0;
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}
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static int
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do_test (void)
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{
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size_t i, j;
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for (i = 0; i < 100; ++i)
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{
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for (j = 0; j < 8192; ++j)
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{
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if (do_rand_tests (i))
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return 1;
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if (do_fill_tests (i, -1) || do_fill_tests (i, 1)
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|| do_fill_tests (i, 0x80) || do_fill_tests (i, 0x88))
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return 1;
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}
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}
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return 0;
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}
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#include <support/test-driver.c>
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