text: /* Test and measure strncpy functions.
     Copyright (C) 1999-2015 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
     <http://www.gnu.org/licenses/>.  */
  
  #ifndef STRNCPY_RESULT
  # define STRNCPY_RESULT(dst, len, n) dst
  # define TEST_MAIN
  # define TEST_NAME "strncpy"
  # include "test-string.h"
  
  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
  
  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) != 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;
  
    align1 &= 7;
    if (align1 + len >= page_size)
      return;
  
    align2 &= 7;
    if (align2 + len >= 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 < 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;
    unsigned char *p1 = buf1 + page_size - 512;
    unsigned char *p2 = buf2 + page_size - 512;
    unsigned char *res;
  
    for (n = 0; n < ITERATIONS; n++)
      {
        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 () & 255;
  	      if (i >= align1 && i < len + align1 && !p1[i])
  		p1[i] = (random () & 127) + 3;
  	    }
  	}
  
        FOR_EACH_IMPL (impl, 1)
  	{
  	  memset (p2 - 64, '\1', 512 + 64);
  	  res = (unsigned char *) 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, 127);
        do_test (i, i, 16, 16, 255);
        do_test (i, 2 * i, 16, 16, 127);
        do_test (2 * i, i, 16, 16, 255);
        do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);
        do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);
        do_test (8 - i, 2 * i, 1 << i, 2 << i, 255);
        do_test (2 * i, 8 - i, 2 << i, 1 << i, 255);
      }
  
    for (i = 1; i < 8; ++i)
      {
        do_test (0, 0, 4 << i, 8 << i, 127);
        do_test (0, 0, 16 << i, 8 << i, 127);
        do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);
        do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);
      }
  
    do_random_tests ();
    return ret;
  }
  
  #include "../test-skeleton.c"
  