string/stratcliff.c

   1 /* Test for string function add boundaries of usable memory.
   2    Copyright (C) 1996 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #define _GNU_SOURCE 1
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27 #include <sys/param.h>
  28
  29 #ifndef MAX
  30 #define MAX(a, b) ((a) > (b) ? (a) : (b))
  31 #endif
  32
  33 int
  34 main (int argc, char *argv[])
  35 {
  36   int size = sysconf (_SC_PAGESIZE);
  37   char *adr, *dest;
  38   int result = 0;
  39
  40   adr = (char *) mmap (NULL, 3 * size, PROT_READ|PROT_WRITE,
  41                        MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  42   dest = (char *) mmap (NULL, 3*size, PROT_READ|PROT_WRITE,
  43                         MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  44   if (adr == (char *)-1L || dest == (char *)-1L)
  45     {
  46       if (errno == ENOSYS)
  47         puts ("No test, mmap not available.");
  48       else
  49         {
  50           printf ("mmap failed: %m");
  51           result = 1;
  52         }
  53     }
  54   else
  55     {
  56       int inner, middle, outer;
  57
  58       mprotect(adr, size, PROT_NONE);
  59       mprotect(adr+2*size, size, PROT_NONE);
  60       adr += size;
  61
  62       mprotect(dest, size, PROT_NONE);
  63       mprotect(dest+2*size, size, PROT_NONE);
  64       dest += size;
  65
  66       memset (adr, 'T', size);
  67
  68       /* strlen test */
  69       for (outer = size - 1; outer >= MAX (0, size - 128); --outer)
  70         {
  71           for (inner = MAX (outer, size - 64); inner < size; ++inner)
  72             {
  73               adr[inner] = '\0';
  74
  75               if (strlen (&adr[outer]) != (size_t) (inner - outer))
  76                 {
  77                   printf ("strlen flunked for outer = %d, inner = %d\n",
  78                           outer, inner);
  79                   result = 1;
  80                 }
  81
  82               adr[inner] = 'T';
  83             }
  84         }
  85
  86       /* strchr test */
  87       for (outer = size - 1; outer >= MAX (0, size - 128); --outer)
  88         {
  89           for (middle = MAX (outer, size - 64); middle < size; ++middle)
  90             {
  91               for (inner = middle; inner < size; ++inner)
  92                 {
  93                   char *cp;
  94                   adr[middle] = 'V';
  95                   adr[inner] = '\0';
  96
  97                   cp = strchr (&adr[outer], 'V');
  98
  99                   if ((inner == middle && cp != NULL)
 100                       || (inner != middle
 101                           && (cp - &adr[outer]) != middle - outer))
 102                     {
 103                       printf ("strchr flunked for outer = %d, middle = %d, "
 104                               "inner = %d\n", outer, middle, inner);
 105                       result = 1;
 106                     }
 107
 108                   adr[inner] = 'T';
 109                   adr[middle] = 'T';
 110                 }
 111             }
 112         }
 113
 114       /* strrchr test */
 115       for (outer = size - 1; outer >= MAX (0, size - 128); --outer)
 116         {
 117           for (middle = MAX (outer, size - 64); middle < size; ++middle)
 118             {
 119               for (inner = middle; inner < size; ++inner)
 120                 {
 121                   char *cp;
 122                   adr[middle] = 'V';
 123                   adr[inner] = '\0';
 124
 125                   cp = strrchr (&adr[outer], 'V');
 126
 127                   if ((inner == middle && cp != NULL)
 128                       || (inner != middle
 129                           && (cp - &adr[outer]) != middle - outer))
 130                     {
 131                       printf ("strrchr flunked for outer = %d, middle = %d, "
 132                               "inner = %d\n", outer, middle, inner);
 133                       result = 1;
 134                     }
 135
 136                   adr[inner] = 'T';
 137                   adr[middle] = 'T';
 138                 }
 139             }
 140         }
 141
 142       /* strcpy test */
 143       for (outer = size - 1; outer >= MAX (0, size - 128); --outer)
 144         {
 145           for (inner = MAX (outer, size - 64); inner < size; ++inner)
 146             {
 147               adr[inner] = '\0';
 148
 149               if (strcpy (dest, &adr[outer]) != dest
 150                   || strlen (dest) != (size_t) (inner - outer))
 151                 {
 152                   printf ("strcpy flunked for outer = %d, inner = %d\n",
 153                           outer, inner);
 154                   result = 1;
 155                 }
 156
 157               adr[inner] = 'T';
 158             }
 159         }
 160
 161       /* stpcpy test */
 162       for (outer = size - 1; outer >= MAX (0, size - 128); --outer)
 163         {
 164           for (inner = MAX (outer, size - 64); inner < size; ++inner)
 165             {
 166               adr[inner] = '\0';
 167
 168               if ((stpcpy (dest, &adr[outer]) - dest) != inner - outer)
 169                 {
 170                   printf ("stpcpy flunked for outer = %d, inner = %d\n",
 171                           outer, inner);
 172                   result = 1;
 173                 }
 174
 175               adr[inner] = 'T';
 176             }
 177         }
 178     }
 179
 180   return result;
 181 }