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glibc/string/test-strncpy.c
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines 
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

358 lines
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/* Test strncpy functions.
Copyright (C) 1999-2021 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/>. */
#ifdef WIDE
# include <wchar.h>
# define CHAR wchar_t
# define UCHAR wchar_t
# define BIG_CHAR WCHAR_MAX
# define SMALL_CHAR 1273
# define MEMCMP wmemcmp
# define MEMSET wmemset
# define STRNLEN wcsnlen
#else
# define CHAR char
# define UCHAR unsigned char
# define BIG_CHAR CHAR_MAX
# define SMALL_CHAR 127
# define MEMCMP memcmp
# define MEMSET memset
# define STRNLEN strnlen
#endif /* !WIDE */
#ifndef STRNCPY_RESULT
# define STRNCPY_RESULT(dst, len, n) dst
# define TEST_MAIN
# ifndef WIDE
# define TEST_NAME "strncpy"
# else
# define TEST_NAME "wcsncpy"
# endif /* WIDE */
# include "test-string.h"
# ifndef WIDE
# define SIMPLE_STRNCPY simple_strncpy
# define STUPID_STRNCPY stupid_strncpy
# define STRNCPY strncpy
# else
# define SIMPLE_STRNCPY simple_wcsncpy
# define STUPID_STRNCPY stupid_wcsncpy
# define STRNCPY wcsncpy
# endif /* WIDE */
CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t);
CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t);
IMPL (STUPID_STRNCPY, 0)
IMPL (SIMPLE_STRNCPY, 0)
IMPL (STRNCPY, 1)
CHAR *
SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n)
{
CHAR *ret = dst;
while (n--)
if ((*dst++ = *src++) == '\0')
{
while (n--)
*dst++ = '\0';
return ret;
}
return ret;
}
CHAR *
STUPID_STRNCPY (CHAR *dst, const CHAR *src, size_t n)
{
size_t nc = STRNLEN (src, n);
size_t i;
for (i = 0; i < nc; ++i)
dst[i] = src[i];
for (; i < n; ++i)
dst[i] = '\0';
return dst;
}
#endif /* !STRNCPY_RESULT */
typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
static void
do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)
{
if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))
{
error (0, 0, "Wrong result in function %s %p %p", impl->name,
CALL (impl, dst, src, n), dst);
ret = 1;
return;
}
if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)
{
error (0, 0, "Wrong result in function %s", impl->name);
ret = 1;
return;
}
if (n > len)
{
size_t i;
for (i = len; i < n; ++i)
if (dst [i] != '\0')
{
error (0, 0, "Wrong result in function %s", impl->name);
ret = 1;
return;
}
}
}
static void
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
{
size_t i;
CHAR *s1, *s2;
/* For wcsncpy: align1 and align2 here mean alignment not in bytes,
but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)). */
align1 &= 7;
if ((align1 + len) * sizeof (CHAR) >= page_size)
return;
align2 &= 7;
if ((align2 + len) * sizeof (CHAR) >= page_size)
return;
s1 = (CHAR *) (buf1) + align1;
s2 = (CHAR *) (buf2) + align2;
for (i = 0; i < len; ++i)
s1[i] = 32 + 23 * i % (max_char - 32);
s1[len] = 0;
for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;
++i)
s1[i] = 32 + 32 * i % (max_char - 32);
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2, s1, len, n);
}
static void
do_page_tests (void)
{
CHAR *s1, *s2;
const size_t maxoffset = 64;
/* Put s1 at the maxoffset from the edge of buf1's last page. */
s1 = (CHAR *) buf1 + BUF1PAGES * page_size / sizeof(CHAR) - maxoffset;
/* s2 needs room to put a string with size of maxoffset + 1 at s2 +
(maxoffset - 1). */
s2 = (CHAR *) buf2 + page_size / sizeof(CHAR) - maxoffset * 2;
MEMSET (s1, 'a', maxoffset - 1);
s1[maxoffset - 1] = '\0';
/* Both strings are bounded to a page with read/write access and the next
page is protected with PROT_NONE (meaning that any access outside of the
page regions will trigger an invalid memory access).
The loop copies the string s1 for all possible offsets up to maxoffset
for both inputs with a size larger than s1 (so memory access outside the
expected memory regions might trigger invalid access). */
for (size_t off1 = 0; off1 < maxoffset; off1++)
{
for (size_t off2 = 0; off2 < maxoffset; off2++)
{
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2 + off2, s1 + off1, maxoffset - off1 - 1,
maxoffset + (maxoffset - off2));
}
}
}
static void
do_random_tests (void)
{
size_t i, j, n, align1, align2, len, size, mode;
UCHAR *p1 = (UCHAR *) (buf1 + page_size) - 512;
UCHAR *p2 = (UCHAR *) (buf2 + page_size) - 512;
UCHAR *res;
for (n = 0; n < ITERATIONS; n++)
{
/* For wcsncpy: align1 and align2 here mean align not in bytes,
but in wchar_ts, in bytes it will equal to align * (sizeof
(wchar_t)). */
mode = random ();
if (mode & 1)
{
size = random () & 255;
align1 = 512 - size - (random () & 15);
if (mode & 2)
align2 = align1 - (random () & 24);
else
align2 = align1 - (random () & 31);
if (mode & 4)
{
j = align1;
align1 = align2;
align2 = j;
}
if (mode & 8)
len = size - (random () & 31);
else
len = 512;
if (len >= 512)
len = random () & 511;
}
else
{
align1 = random () & 31;
if (mode & 2)
align2 = random () & 31;
else
align2 = align1 + (random () & 24);
len = random () & 511;
j = align1;
if (align2 > j)
j = align2;
if (mode & 4)
{
size = random () & 511;
if (size + j > 512)
size = 512 - j - (random () & 31);
}
else
size = 512 - j;
if ((mode & 8) && len + j >= 512)
len = 512 - j - (random () & 7);
}
j = len + align1 + 64;
if (j > 512)
j = 512;
for (i = 0; i < j; i++)
{
if (i == len + align1)
p1[i] = 0;
else
{
p1[i] = random () & BIG_CHAR;
if (i >= align1 && i < len + align1 && !p1[i])
p1[i] = (random () & SMALL_CHAR) + 3;
}
}
FOR_EACH_IMPL (impl, 1)
{
MEMSET (p2 - 64, '\1', 512 + 64);
res = (UCHAR *) CALL (impl, (CHAR *) (p2 + align2),
(CHAR *) (p1 + align1), size);
if (res != STRNCPY_RESULT (p2 + align2, len, size))
{
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
n, impl->name, align1, align2, len, res,
STRNCPY_RESULT (p2 + align2, len, size));
ret = 1;
}
for (j = 0; j < align2 + 64; ++j)
{
if (p2[j - 64] != '\1')
{
error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
}
j = align2 + len + 1;
if (size + align2 > j)
j = size + align2;
for (; j < 512; ++j)
{
if (p2[j] != '\1')
{
error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
}
for (j = align2 + len + 1; j < align2 + size; ++j)
if (p2[j])
{
error (0, 0, "Iteration %zd - garbage after size, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
j = len + 1;
if (size < j)
j = size;
if (MEMCMP (p1 + align1, p2 + align2, j))
{
error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
}
}
}
}
int
test_main (void)
{
size_t i;
test_init ();
printf ("%28s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 1; i < 8; ++i)
{
do_test (i, i, 16, 16, SMALL_CHAR);
do_test (i, i, 16, 16, BIG_CHAR);
do_test (i, 2 * i, 16, 16, SMALL_CHAR);
do_test (2 * i, i, 16, 16, BIG_CHAR);
do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);
do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);
do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);
do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);
}
for (i = 1; i < 8; ++i)
{
do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);
do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);
do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);
do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);
}
do_random_tests ();
do_page_tests ();
return ret;
}
#include <support/test-driver.c>
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