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/* Test memchr functions.
Copyright (C) 1999-2022 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/>. */
#define TEST_MAIN
#ifndef WIDE
# define TEST_NAME "memchr"
#else
# define TEST_NAME "wmemchr"
#endif /* WIDE */
#include "test-string.h"
#include <stdint.h>
#ifndef WIDE
# define MEMCHR memchr
# define CHAR char
# define UCHAR unsigned char
# define SIMPLE_MEMCHR simple_memchr
# define BIG_CHAR CHAR_MAX
# define SMALL_CHAR 127
#else
# include <wchar.h>
# define MEMCHR wmemchr
# define CHAR wchar_t
# define UCHAR wchar_t
# define SIMPLE_MEMCHR simple_wmemchr
# define BIG_CHAR WCHAR_MAX
# define SMALL_CHAR 1273
#endif /* WIDE */
typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
IMPL (MEMCHR, 1)
/* Naive implementation to verify results. */
CHAR *
SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
{
while (n--)
if (*s++ == (CHAR) c)
return (CHAR *) s - 1;
return NULL;
}
static void
do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
{
CHAR *res = CALL (impl, s, c, n);
if (res != exp_res)
{
error (0, 0, "Wrong result in function %s (%p, %d, %zu) -> %p != %p",
impl->name, s, c, n, res, exp_res);
ret = 1;
return;
}
}
static void
do_test (size_t align, size_t pos, size_t len, size_t n, int seek_char)
{
size_t i;
CHAR *result;
if ((align + len) * sizeof (CHAR) >= page_size)
return;
CHAR *buf = (CHAR *) (buf1);
for (i = 0; i < len; ++i)
{
buf[align + i] = 1 + 23 * i % SMALL_CHAR;
if (buf[align + i] == seek_char)
buf[align + i] = seek_char + 1;
}
buf[align + len] = 0;
if (pos < MIN(n, len))
{
buf[align + pos] = seek_char;
buf[align + len] = -seek_char;
result = (CHAR *) (buf + align + pos);
}
else
{
result = NULL;
buf[align + len] = seek_char;
}
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, (CHAR *) (buf + align), seek_char, n, result);
}
static void
do_overflow_tests (void)
{
size_t i, j, len;
const size_t one = 1;
uintptr_t buf_addr = (uintptr_t) buf1;
for (i = 0; i < 750; ++i)
{
do_test (0, i, 751, SIZE_MAX - i, BIG_CHAR);
do_test (0, i, 751, i - buf_addr, BIG_CHAR);
do_test (0, i, 751, -buf_addr - i, BIG_CHAR);
do_test (0, i, 751, SIZE_MAX - buf_addr - i, BIG_CHAR);
do_test (0, i, 751, SIZE_MAX - buf_addr + i, BIG_CHAR);
len = 0;
for (j = 8 * sizeof(size_t) - 1; j ; --j)
{
len |= one << j;
do_test (0, i, 751, len - i, BIG_CHAR);
do_test (0, i, 751, len + i, BIG_CHAR);
do_test (0, i, 751, len - buf_addr - i, BIG_CHAR);
do_test (0, i, 751, len - buf_addr + i, BIG_CHAR);
do_test (0, i, 751, ~len - i, BIG_CHAR);
do_test (0, i, 751, ~len + i, BIG_CHAR);
do_test (0, i, 751, ~len - buf_addr - i, BIG_CHAR);
do_test (0, i, 751, ~len - buf_addr + i, BIG_CHAR);
}
}
}
static void
do_random_tests (void)
{
size_t i, j, n, align, pos, len;
int seek_char;
CHAR *result;
UCHAR *p = (UCHAR *) (buf1 + page_size) - 512;
for (n = 0; n < ITERATIONS; n++)
{
align = random () & 15;
pos = random () & 511;
if (pos + align >= 512)
pos = 511 - align - (random () & 7);
len = random () & 511;
if (pos >= len)
len = pos + (random () & 7);
if (len + align >= 512)
len = 512 - align - (random () & 7);
seek_char = random () & BIG_CHAR;
j = len + align + 64;
if (j > 512)
j = 512;
for (i = 0; i < j; i++)
{
if (i == pos + align)
p[i] = seek_char;
else
{
p[i] = random () & BIG_CHAR;
if (i < pos + align && p[i] == seek_char)
p[i] = seek_char + 13;
}
}
if (pos < len)
{
size_t r = random ();
if ((r & 31) == 0)
len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
result = (CHAR *) (p + pos + align);
}
else
result = NULL;
FOR_EACH_IMPL (impl, 1)
if (CALL (impl, (CHAR *) (p + align), seek_char, len) != result)
{
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
n, impl->name, align, seek_char, len, pos,
CALL (impl, (CHAR *) (p + align), seek_char, len),
result, p);
ret = 1;
}
}
}
int
test_main (void)
{
size_t i, j;
test_init ();
printf ("%20s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 1; i < 8; ++i)
{
/* Test n == 0. */
do_test (i, i, 0, 0, 23);
do_test (i, i, 0, 0, 0);
do_test (0, 16 << i, 2048, 2048, 23);
do_test (i, 64, 256, 256, 23);
do_test (0, 16 << i, 2048, 2048, 0);
do_test (i, 64, 256, 256, 0);
/* Check for large input sizes and for these cases we need to
make sure the byte is within the size range (that's why
7 << i must be smaller than 2048). */
do_test (0, 7 << i, 2048, SIZE_MAX, 23);
do_test (0, 2048 - i, 2048, SIZE_MAX, 23);
do_test (i, 64, 256, SIZE_MAX, 23);
do_test (0, 7 << i, 2048, SIZE_MAX, 0);
do_test (0, 2048 - i, 2048, SIZE_MAX, 0);
do_test (i, 64, 256, SIZE_MAX, 0);
}
for (i = 1; i < 64; ++i)
{
for (j = 1; j < 64; j++)
{
do_test (0, 64 - j, 64, SIZE_MAX, 23);
do_test (i, 64 - j, 64, SIZE_MAX, 23);
}
}
for (i = 1; i < 32; ++i)
{
do_test (0, i, i + 1, i + 1, 23);
do_test (0, i, i + 1, i + 1, 0);
}
/* BZ#21182 - wrong overflow calculation for i686 implementation
with address near end of the page. */
for (i = 2; i < 16; ++i)
{
/* page_size is in fact getpagesize() * 2. */
do_test (page_size / 2 - i, i, i, 1, 0x9B);
do_test (page_size / 2 - i, i - 1, i - 1, 1, 0x9B);
}
do_random_tests ();
do_overflow_tests ();
return ret;
}
#include <support/test-driver.c>
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