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cf11e74b0d
It uses the same two-way algorithm used on strstr, strcasestr, and memmem. Different than strstr, neither the "shift table" optimization nor the self-adapting filtering check is used because it would result in a too-large shift table (and it also simplifies the implementation bit). Checked on x86_64-linux-gnu and aarch64-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com>
482 lines
12 KiB
C
482 lines
12 KiB
C
/* Test and measure strstr functions.
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Copyright (C) 2010-2024 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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#define TEST_MAIN
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#ifndef WIDE
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# define TEST_NAME "strstr"
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# define TEST_FUNC strstr
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#else
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# define TEST_NAME "wcsstr"
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# define TEST_FUNC wcsstr
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#endif
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#ifndef WIDE
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# define CHAR char
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# define STRLEN strlen
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# define STRCPY strcpy
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# define MEMCPY memcpy
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# define MEMSET memset
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# define MEMPCPY mempcpy
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# define L(s) s
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#else
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# include <wchar.h>
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# define CHAR wchar_t
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# define STRLEN wcslen
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# define STRCPY wcscpy
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# define MEMCPY wmemcpy
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# define MEMSET wmemset
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# define MEMPCPY wmempcpy
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# define L(s) L ## s
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/* The test requires up to 8191 characters, so allocate at least 32Kb
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(considering 4kb page size). */
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# define BUF1PAGES 4
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#endif
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#include "test-string.h"
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#ifndef WIDE
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# define STRSTR c_strstr
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# define libc_hidden_builtin_def(arg) /* nothing */
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# define __strnlen strnlen
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# include "strstr.c"
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# define C_IMPL STRSTR
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#else
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# undef weak_alias
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# define weak_alias(a, b)
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# define WCSSTR c_wcsstr
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# define __wmemcmp wmemcmp
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# define __wcsnlen wcsnlen
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# define __wcslen wcslen
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# include "wcsstr.c"
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# define C_IMPL WCSSTR
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#endif
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/* Naive implementation to verify results. */
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static CHAR *
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simple_strstr (const CHAR *s1, const CHAR *s2)
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{
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ssize_t s1len = STRLEN (s1);
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ssize_t s2len = STRLEN (s2);
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if (s2len > s1len)
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return NULL;
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for (ssize_t i = 0; i <= s1len - s2len; ++i)
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{
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size_t j;
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for (j = 0; j < s2len; ++j)
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if (s1[i + j] != s2[j])
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break;
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if (j == s2len)
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return (CHAR *) s1 + i;
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}
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return NULL;
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}
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typedef CHAR *(*proto_t) (const CHAR *, const CHAR *);
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IMPL (C_IMPL, 1)
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IMPL (TEST_FUNC, 1)
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static int
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check_result (impl_t *impl, const CHAR *s1, const CHAR *s2,
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CHAR *exp_result)
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{
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CHAR *result = CALL (impl, s1, s2);
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if (result != exp_result)
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{
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error (0, 0, "Wrong result in function %s %p %p", impl->name,
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result, exp_result);
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ret = 1;
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return -1;
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}
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return 0;
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}
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static void
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do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, CHAR *exp_result)
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{
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if (check_result (impl, s1, s2, exp_result) < 0)
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return;
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}
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static void
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do_test (size_t align1, size_t align2, size_t len1, size_t len2,
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int fail)
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{
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align1 = align1 * sizeof (CHAR);
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align2 = align2 * sizeof (CHAR);
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CHAR *s1 = (CHAR *) (buf1 + align1);
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CHAR *s2 = (CHAR *) (buf2 + align2);
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static const CHAR d[] = L("1234567890abcdef");
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const size_t dl = STRLEN (d);
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CHAR *ss2 = s2;
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for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
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{
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size_t t = l > dl ? dl : l;
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ss2 = MEMPCPY (ss2, d, t);
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}
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s2[len2] = '\0';
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if (fail)
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{
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CHAR *ss1 = s1;
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for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
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{
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size_t t = l > dl ? dl : l;
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MEMCPY (ss1, d, t);
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++ss1[len2 > 7 ? 7 : len2 - 1];
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ss1 += t;
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}
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}
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else
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{
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MEMSET (s1, '0', len1);
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MEMCPY (s1 + len1 - len2, s2, len2);
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}
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s1[len1] = '\0';
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
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}
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static void
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check1 (void)
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{
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const CHAR s1[] =
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L("F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD_C3_A7_20_EF_BF_BD");
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const CHAR s2[] = L("_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD");
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CHAR *exp_result;
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exp_result = simple_strstr (s1, s2);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, s1, s2, exp_result);
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}
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static void
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check2 (void)
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{
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const CHAR s1_stack[] = L(", enable_static, \0, enable_shared, ");
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const size_t s1_char_count = 18;
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const size_t s1_byte_len = 18 * sizeof (CHAR);
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const CHAR *s2_stack = &(s1_stack[s1_char_count]);
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const size_t s2_byte_len = 18 * sizeof (CHAR);
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CHAR *exp_result;
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const size_t page_size_real = getpagesize ();
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/* Haystack at end of page. The following page is protected. */
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CHAR *s1_page_end = (void *) buf1 + page_size - s1_byte_len;
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STRCPY (s1_page_end, s1_stack);
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/* Haystack which crosses a page boundary.
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Note: page_size is at least 2 * getpagesize. See test_init. */
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CHAR *s1_page_cross = (void *) buf1 + page_size_real - 8;
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STRCPY (s1_page_cross, s1_stack);
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/* Needle at end of page. The following page is protected. */
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CHAR *s2_page_end = (void *) buf2 + page_size - s2_byte_len;
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STRCPY (s2_page_end, s2_stack);
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/* Needle which crosses a page boundary.
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Note: page_size is at least 2 * getpagesize. See test_init. */
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CHAR *s2_page_cross = (void *) buf2 + page_size_real - 8;
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STRCPY (s2_page_cross, s2_stack);
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exp_result = simple_strstr (s1_stack, s2_stack);
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FOR_EACH_IMPL (impl, 0)
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{
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check_result (impl, s1_stack, s2_stack, exp_result);
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check_result (impl, s1_stack, s2_page_end, exp_result);
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check_result (impl, s1_stack, s2_page_cross, exp_result);
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check_result (impl, s1_page_end, s2_stack, exp_result);
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check_result (impl, s1_page_end, s2_page_end, exp_result);
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check_result (impl, s1_page_end, s2_page_cross, exp_result);
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check_result (impl, s1_page_cross, s2_stack, exp_result);
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check_result (impl, s1_page_cross, s2_page_end, exp_result);
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check_result (impl, s1_page_cross, s2_page_cross, exp_result);
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}
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}
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static void
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check3 (void)
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{
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/* Check that a long periodic needle does not cause false positives. */
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{
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const CHAR input[] = L("F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_A7_20_EF_BF_BD");
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const CHAR need[] = L("_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD");
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, input, need, NULL);
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}
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{
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const CHAR input[] = L("F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_A7_20_EF_BF_BD_DA_B5_C2_A6_20"
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"_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD");
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const CHAR need[] = L("_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD");
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, input, need, (CHAR *) input + 115);
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}
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}
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#define N 1024
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static void
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pr23637 (void)
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{
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CHAR *h = (CHAR*) buf1;
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CHAR *n = (CHAR*) buf2;
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for (int i = 0; i < N; i++)
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{
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n[i] = 'x';
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h[i] = ' ';
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h[i + N] = 'x';
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}
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n[N] = '\0';
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h[N * 2] = '\0';
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/* Ensure we don't match at the first 'x'. */
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h[0] = 'x';
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CHAR *exp_result = simple_strstr (h, n);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, h, n, exp_result);
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}
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static void
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pr23865 (void)
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{
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/* Check that a very long haystack is handled quickly if the needle is
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short and occurs near the beginning. */
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{
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size_t m = 1000000;
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const CHAR *needle =
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L("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
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CHAR *haystack = xmalloc ((m + 1) * sizeof (CHAR));
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MEMSET (haystack, L('A'), m);
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haystack[0] = L('B');
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haystack[m] = L('\0');
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, haystack, needle, haystack + 1);
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free (haystack);
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}
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/* Check that a very long needle is discarded quickly if the haystack is
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short. */
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{
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size_t m = 1000000;
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const CHAR *haystack =
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L("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"ABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB");
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CHAR *needle = xmalloc ((m + 1) * sizeof (CHAR));
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MEMSET (needle, L'A', m);
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needle[m] = L('\0');
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, haystack, needle, NULL);
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free (needle);
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}
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/* Check that the asymptotic worst-case complexity is not quadratic. */
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{
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size_t m = 1000000;
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CHAR *haystack = xmalloc ((2 * m + 2) * sizeof (CHAR));
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CHAR *needle = xmalloc ((m + 2) * sizeof (CHAR));
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MEMSET (haystack, L('A'), 2 * m);
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haystack[2 * m] = L('B');
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haystack[2 * m + 1] = L('\0');
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MEMSET (needle, L('A'), m);
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needle[m] = L('B');
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needle[m + 1] = L('\0');
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, haystack, needle, haystack + m);
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free (needle);
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free (haystack);
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}
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{
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/* Ensure that with a barely periodic "short" needle, STRSTR's
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search does not mistakenly skip just past the match point. */
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const CHAR *haystack =
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L("\n"
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"with_build_libsubdir\n"
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"with_local_prefix\n"
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"with_gxx_include_dir\n"
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"with_cpp_install_dir\n"
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"enable_generated_files_in_srcdir\n"
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"with_gnu_ld\n"
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"with_ld\n"
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"with_demangler_in_ld\n"
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"with_gnu_as\n"
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"with_as\n"
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"enable_largefile\n"
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"enable_werror_always\n"
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"enable_checking\n"
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"enable_coverage\n"
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"enable_gather_detailed_mem_stats\n"
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"enable_build_with_cxx\n"
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"with_stabs\n"
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"enable_multilib\n"
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"enable___cxa_atexit\n"
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"enable_decimal_float\n"
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"enable_fixed_point\n"
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"enable_threads\n"
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"enable_tls\n"
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"enable_objc_gc\n"
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"with_dwarf2\n"
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"enable_shared\n"
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"with_build_sysroot\n"
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"with_sysroot\n"
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"with_specs\n"
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"with_pkgversion\n"
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"with_bugurl\n"
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"enable_languages\n"
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"with_multilib_list\n");
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const CHAR *needle =
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L("\n"
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"with_gnu_ld\n");
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, haystack, needle, (CHAR*) haystack + 114);
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}
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{
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/* Same bug, shorter trigger. */
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const CHAR *haystack = L("..wi.d.");
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const CHAR *needle = L(".d.");
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, haystack, needle, (CHAR*) haystack + 4);
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}
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/* Test case from Yves Bastide.
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<https://www.openwall.com/lists/musl/2014/04/18/2> */
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{
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const CHAR *input = L("playing play play play always");
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const CHAR *needle = L("play play play");
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, input, needle, (CHAR*) input + 8);
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}
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/* Test long needles. */
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{
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size_t m = 1024;
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CHAR *haystack = xmalloc ((2 * m + 1) * sizeof (CHAR));
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CHAR *needle = xmalloc ((m + 1) * sizeof (CHAR));
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haystack[0] = L('x');
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MEMSET (haystack + 1, L(' '), m - 1);
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MEMSET (haystack + m, L('x'), m);
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haystack[2 * m] = L('\0');
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MEMSET (needle, L('x'), m);
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needle[m] = L('\0');
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, haystack, needle, haystack + m);
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free (needle);
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free (haystack);
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}
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}
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static int
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test_main (void)
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{
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test_init ();
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check1 ();
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check2 ();
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check3 ();
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pr23637 ();
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pr23865 ();
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printf ("%23s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (size_t klen = 2; klen < 32; ++klen)
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for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
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{
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do_test (0, 0, hlen, klen, 0);
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do_test (0, 0, hlen, klen, 1);
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do_test (0, 3, hlen, klen, 0);
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do_test (0, 3, hlen, klen, 1);
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do_test (0, 9, hlen, klen, 0);
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do_test (0, 9, hlen, klen, 1);
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do_test (0, 15, hlen, klen, 0);
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do_test (0, 15, hlen, klen, 1);
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do_test (3, 0, hlen, klen, 0);
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do_test (3, 0, hlen, klen, 1);
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do_test (3, 3, hlen, klen, 0);
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do_test (3, 3, hlen, klen, 1);
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do_test (3, 9, hlen, klen, 0);
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do_test (3, 9, hlen, klen, 1);
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do_test (3, 15, hlen, klen, 0);
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do_test (3, 15, hlen, klen, 1);
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do_test (9, 0, hlen, klen, 0);
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do_test (9, 0, hlen, klen, 1);
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do_test (9, 3, hlen, klen, 0);
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do_test (9, 3, hlen, klen, 1);
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do_test (9, 9, hlen, klen, 0);
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do_test (9, 9, hlen, klen, 1);
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do_test (9, 15, hlen, klen, 0);
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do_test (9, 15, hlen, klen, 1);
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do_test (15, 0, hlen, klen, 0);
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do_test (15, 0, hlen, klen, 1);
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do_test (15, 3, hlen, klen, 0);
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do_test (15, 3, hlen, klen, 1);
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do_test (15, 9, hlen, klen, 0);
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do_test (15, 9, hlen, klen, 1);
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do_test (15, 15, hlen, klen, 0);
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do_test (15, 15, hlen, klen, 1);
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do_test (15, 15, hlen + klen * 4, klen * 4, 0);
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do_test (15, 15, hlen + klen * 4, klen * 4, 1);
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}
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do_test (0, 0, page_size - 1, 16, 0);
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do_test (0, 0, page_size - 1, 16, 1);
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return ret;
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}
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#include <support/test-driver.c>
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