path: root/string/stratcliff.c

/* Test for string function add boundaries of usable memory.
   Copyright (C) 1996-2025 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 _GNU_SOURCE 1

/* Make sure we don't test the optimized inline functions if we want to
   test the real implementation.  */
#undef __USE_STRING_INLINES

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/param.h>

#ifndef CHAR
# define L(c) c
# define CHAR char
# define MEMSET memset
# define STRLEN strlen
# define STRNLEN strnlen
# define STRCHR strchr
# define STRRCHR strrchr
# define STRCPY strcpy
# define STRNCPY strncpy
# define MEMCMP memcmp
# define STPCPY stpcpy
# define STPNCPY stpncpy
# define MEMCPY memcpy
# define MEMPCPY mempcpy
# define MEMCHR memchr
# define STRCMP strcmp
# define STRNCMP strncmp
#endif


#define STRINGIFY(s) STRINGIFY2 (s)
#define STRINGIFY2(s) #s


int
do_test (void)
{
  size_t size = sysconf (_SC_PAGESIZE);
  size_t nchars = size / sizeof (CHAR);
  CHAR *adr;
  CHAR *dest;
  int result = 0;

  adr = (CHAR *) mmap (NULL, 3 * size, PROT_READ | PROT_WRITE,
		       MAP_PRIVATE | MAP_ANON, -1, 0);
  dest = (CHAR *) mmap (NULL, 3 * size, PROT_READ | PROT_WRITE,
			MAP_PRIVATE | MAP_ANON, -1, 0);
  if (adr == MAP_FAILED || dest == MAP_FAILED)
    {
      if (errno == ENOSYS)
	puts ("No test, mmap not available.");
      else
	{
	  printf ("mmap failed: %m");
	  result = 1;
	}
    }
  else
    {
      size_t inner, middle, outer, nchars64, max128;

      if (nchars > 64)
	nchars64 = nchars - 64;
      else
	nchars64 = 0;

      if (nchars > 128)
	max128 = nchars - 128;
      else
	max128 = 0;

      mprotect (adr, size, PROT_NONE);
      mprotect (adr + 2 * nchars, size, PROT_NONE);
      adr += nchars;

      mprotect (dest, size, PROT_NONE);
      mprotect (dest + 2 * nchars, size, PROT_NONE);
      dest += nchars;

      MEMSET (adr, L('T'), nchars);

      /* strlen/wcslen test */
      for (outer = nchars - 1; outer >= max128; --outer)
	{
	  for (inner = MAX (outer, nchars64); inner < nchars; ++inner)
	    {
	      adr[inner] = L('\0');

	      if (STRLEN (&adr[outer]) != (size_t) (inner - outer))
		{
		  printf ("%s flunked for outer = %zu, inner = %zu\n",
			  STRINGIFY (STRLEN), outer, inner);
		  result = 1;
		}

	      adr[inner] = L('T');
	    }
	  if (outer == 0)
	    break;
	}

      /* strnlen/wcsnlen test */
      for (