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cb882b21b6
Place strings ending at page boundary without the null byte. If an implementation goes beyond EXP_LEN, it will trigger the segfault.
281 lines
7.2 KiB
C
281 lines
7.2 KiB
C
/* Test strlen functions.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Jakub Jelinek <jakub@redhat.com>, 1999.
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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 "strnlen"
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#else
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# define TEST_NAME "wcsnlen"
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#endif /* !WIDE */
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#include "test-string.h"
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#ifndef WIDE
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# define STRNLEN strnlen
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# define MEMSET memset
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# define CHAR char
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# define BIG_CHAR CHAR_MAX
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# define MIDDLE_CHAR 127
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# define SIMPLE_STRNLEN simple_strnlen
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#else
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# include <wchar.h>
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# define STRNLEN wcsnlen
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# define MEMSET wmemset
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# define CHAR wchar_t
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# define BIG_CHAR WCHAR_MAX
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# define MIDDLE_CHAR 1121
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# define SIMPLE_STRNLEN simple_wcsnlen
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#endif /* !WIDE */
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typedef size_t (*proto_t) (const CHAR *, size_t);
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size_t SIMPLE_STRNLEN (const CHAR *, size_t);
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IMPL (SIMPLE_STRNLEN, 0)
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IMPL (STRNLEN, 1)
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size_t
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SIMPLE_STRNLEN (const CHAR *s, size_t maxlen)
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{
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size_t i;
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for (i = 0; i < maxlen && s[i]; ++i);
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return i;
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}
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static void
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do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)
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{
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size_t len = CALL (impl, s, maxlen);
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if (len != exp_len)
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{
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error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
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len, exp_len);
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ret = 1;
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return;
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}
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}
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static void
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do_test (size_t align, size_t len, size_t maxlen, int max_char)
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{
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size_t i;
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align &= 63;
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if ((align + len) * sizeof (CHAR) >= page_size)
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return;
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CHAR *buf = (CHAR *) (buf1);
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for (i = 0; i < len; ++i)
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buf[align + i] = 1 + 11111 * i % max_char;
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buf[align + len] = 0;
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
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}
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static void
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do_random_tests (void)
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{
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size_t i, j, n, align, len;
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CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));
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for (n = 0; n < ITERATIONS; n++)
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{
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align = random () & 15;
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len = random () & 511;
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if (len + align > 510)
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len = 511 - align - (random () & 7);
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j = len + align + 64;
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if (j > 512)
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j = 512;
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for (i = 0; i < j; i++)
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{
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if (i == len + align)
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p[i] = 0;
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else
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{
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p[i] = random () & 255;
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if (i >= align && i < len + align && !p[i])
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p[i] = (random () & 127) + 1;
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}
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}
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FOR_EACH_IMPL (impl, 1)
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{
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if (len > 0
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&& CALL (impl, (CHAR *) (p + align), len - 1) != len - 1)
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{
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error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
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n, impl->name, align,
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CALL (impl, (CHAR *) (p + align), len - 1), len - 1, p);
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ret = 1;
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}
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if (CALL (impl, (CHAR *) (p + align), len) != len)
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{
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error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
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n, impl->name, align,
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CALL (impl, (CHAR *) (p + align), len), len, p);
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ret = 1;
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}
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if (CALL (impl, (CHAR *) (p + align), len + 1) != len)
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{
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error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
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n, impl->name, align,
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CALL (impl, (CHAR *) (p + align), len + 1), len, p);
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ret = 1;
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}
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}
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}
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}
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/* Tests meant to unveil fail on implementation that does not access bytes
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around the page boundary accordingly. */
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static void
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do_page_tests (void)
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{
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size_t i, exp_len, start_offset, offset;
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/* Calculate the null character offset. */
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size_t last_offset = (page_size / sizeof (CHAR)) - 1;
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CHAR *s = (CHAR *) buf2;
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MEMSET (s, 65, (last_offset - 1));
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s[last_offset] = 0;
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/* Place short strings ending at page boundary. */
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offset = last_offset;
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for (i = 0; i < 128; i++)
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{
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/* Decrease offset to stress several sizes and alignments. */
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offset--;
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exp_len = last_offset - offset;
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FOR_EACH_IMPL (impl, 0)
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{
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/* Varies maxlen value to cover the cases where it is:
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- larger than length;
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- slightly greater than length;
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- equal to length;
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- slightly less than length. */
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do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
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do_one_test (impl, (CHAR *) (s + offset), exp_len + 1, exp_len);
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do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
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if (exp_len > 0)
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do_one_test (impl, (CHAR *) (s + offset), exp_len - 1, exp_len - 1);
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}
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}
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/* Place long strings ending at page boundary. */
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start_offset = (last_offset + 1) / 2;
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for (i = 0; i < 64; ++i)
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{
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/* Increase offset to stress several alignments. */
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offset = start_offset + i;
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if (offset >= (last_offset + 1))
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break;
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exp_len = last_offset - offset;
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FOR_EACH_IMPL (impl, 0)
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{
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/* Checks only for maxlen much larger than length because smaller
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values are already covered in do_random_tests function. */
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do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
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}
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}
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}
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/* Tests meant to unveil fail on implementations that access bytes
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beyond the maxium length. */
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static void
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do_page_2_tests (void)
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{
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size_t i, exp_len, offset;
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size_t last_offset = page_size / sizeof (CHAR);
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CHAR *s = (CHAR *) buf2;
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MEMSET (s, 65, last_offset);
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/* Place short strings ending at page boundary without the null
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byte. */
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offset = last_offset;
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for (i = 0; i < 128; i++)
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{
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/* Decrease offset to stress several sizes and alignments. */
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offset--;
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exp_len = last_offset - offset;
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FOR_EACH_IMPL (impl, 0)
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{
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/* If an implementation goes beyond EXP_LEN, it will trigger
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the segfault. */
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do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
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}
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}
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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printf ("%20s", "");
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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 (i = 1; i < 8; ++i)
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{
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do_test (0, i, i - 1, MIDDLE_CHAR);
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do_test (0, i, i, MIDDLE_CHAR);
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do_test (0, i, i + 1, MIDDLE_CHAR);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (i, i, i - 1, MIDDLE_CHAR);
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do_test (i, i, i, MIDDLE_CHAR);
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do_test (i, i, i + 1, MIDDLE_CHAR);
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}
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for (i = 2; i <= 10; ++i)
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{
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do_test (0, 1 << i, 5000, MIDDLE_CHAR);
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do_test (1, 1 << i, 5000, MIDDLE_CHAR);
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}
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for (i = 1; i < 8; ++i)
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do_test (0, i, 5000, BIG_CHAR);
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for (i = 1; i < 8; ++i)
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do_test (i, i, 5000, BIG_CHAR);
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for (i = 2; i <= 10; ++i)
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{
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do_test (0, 1 << i, 5000, BIG_CHAR);
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do_test (1, 1 << i, 5000, BIG_CHAR);
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}
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do_random_tests ();
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do_page_tests ();
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do_page_2_tests ();
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return ret;
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}
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#include <support/test-driver.c>
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