outer, middle, inner);
outer, middle);
main (int argc, char *argv[]){  int size = sysconf (_SC_PAGESIZE);  char *adr, *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    {      int inner, middle, outer;      mprotect(adr, size, PROT_NONE);      mprotect(adr + 2 * size, size, PROT_NONE);      adr += size;      mprotect(dest, size, PROT_NONE);      mprotect(dest + 2 * size, size, PROT_NONE);      dest += size;      memset (adr, 'T', size);      /* strlen test */      for (outer = size - 1; outer >= MAX (0, size - 128); --outer)        {          for (inner = MAX (outer, size - 64); inner < size; ++inner)	    {	      adr[inner] = '\0';	      if (strlen (&adr[outer]) != (size_t) (inner - outer))		{		  printf ("strlen flunked for outer = %d, inner = %d\n",			  outer, inner);		  result = 1;		}	      adr[inner] = 'T';	    }        }      /* strchr test */      for (outer = size - 1; outer >= MAX (0, size - 128); --outer)        {	  for (middle = MAX (outer, size - 64); middle < size; ++middle)	    {	      for (inner = middle; inner < size; ++inner)		{		  char *cp;		  adr[middle] = 'V';		  adr[inner] = '\0';		  cp = strchr (&adr[outer], 'V');		  if ((inner == middle && cp != NULL)		      || (inner != middle			  && (cp - &adr[outer]) != middle - outer))		    {		      printf ("strchr flunked for outer = %d, middle = %d, "			      "inner = %d\n", outer, middle, inner);		      result = 1;		    }		  adr[inner] = 'T';		  adr[middle] = 'T';		}	    }        }      /* Special test.  */      adr[size - 1] = '\0';      if (strchr (&adr[size - 1], '\n') != NULL)	{	  puts ("strchr flunked for test of empty string at end of page");	  result = 1;	}      /* strrchr test */      for (outer = size - 1; outer >= MAX (0, size - 128); --outer)        {	  for (middle = MAX (outer, size - 64); middle < size; ++middle)	    {	      for (inner = middle; inner < size; ++inner)		{		  char *cp;		  adr[middle] = 'V';		  adr[inner] = '\0';		  cp = strrchr (&adr[outer], 'V');		  if ((inner == middle && cp != NULL)		      || (inner != middle			  && (cp - &adr[outer]) != middle - outer))		    {		      printf ("strrchr flunked for outer = %d, middle = %d, "			      "inner = %d\n", outer, middle, inner);		      result = 1;		    }		  adr[inner] = 'T';		  adr[middle] = 'T';		}	    }        }      /* rawmemchr test */      for (outer = size - 1; outer >= MAX (0, size - 128); --outer)        {	  for (middle = MAX (outer, size - 64); middle < size; ++middle)	    {	      char *cp;	      adr[middle] = 'V';	      cp = rawmemchr (&adr[outer], 'V');	      if (cp - &adr[outer] != middle - outer)		{		  printf ("rawmemchr flunked for outer = %d, middle = %d\n",			  outer, middle, inner);		  result = 1;		}	      adr[middle] = 'T';	    }        }      /* strcpy test */      for (outer = size - 1; outer >= MAX (0, size - 128); --outer)        {          for (inner = MAX (outer, size - 64); inner < size; ++inner)	    {	      adr[inner] = '\0';	      if (strcpy (dest, &adr[outer]) != dest		  || strlen (dest) != (size_t) (inner - outer))		{		  printf ("strcpy flunked for outer = %d, inner = %d\n",			  outer, inner);		  result = 1;		}	      adr[inner] = 'T';	    }        }      /* stpcpy test */      for (outer = size - 1; outer >= MAX (0, size - 128); --outer)        {          for (inner = MAX (outer, size - 64); inner < size; ++inner)	    {	      adr[inner] = '\0';	      if ((stpcpy (dest, &adr[outer]) - dest) != inner - outer)		{		  printf ("stpcpy flunked for outer = %d, inner = %d\n",			  outer, inner);		  result = 1;		}	      adr[inner] = 'T';	    }        }    }  return result;}