glibc/string/test-strncpy.c

/* Test strncpy functions.
   Copyright (C) 1999-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Jakub Jelinek <jakub@redhat.com>, 1999.

   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_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 ();
  return ret;
}

#include <support/test-driver.c>