drd/drd_strmem_intercepts.c

   1 /*--------------------------------------------------------------------*/
   2 /*--- Replacements for strlen() and strnlen(), which run on the    ---*/
   3 /*--- simulated CPU.                                               ---*/
   4 /*--------------------------------------------------------------------*/
   5
   6 /*
   7   This file is part of DRD, a heavyweight Valgrind tool for
   8   detecting threading errors. The code below has been extracted
   9   from memchec/mc_replace_strmem.c, which has the following copyright
  10   notice:
  11
  12   Copyright (C) 2000-2011 Julian Seward
  13   jseward@acm.org
  14
  15   This program is free software; you can redistribute it and/or
  16   modify it under the terms of the GNU General Public License as
  17   published by the Free Software Foundation; either version 2 of the
  18   License, or (at your option) any later version.
  19
  20   This program is distributed in the hope that it will be useful, but
  21   WITHOUT ANY WARRANTY; without even the implied warranty of
  22   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23   General Public License for more details.
  24
  25   You should have received a copy of the GNU General Public License
  26   along with this program; if not, write to the Free Software
  27   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  28   02111-1307, USA.
  29
  30   The GNU General Public License is contained in the file COPYING.
  31 */
  32
  33 #include "pub_tool_basics.h"
  34 #include "pub_tool_hashtable.h"
  35 #include "pub_tool_redir.h"
  36 #include "pub_tool_tooliface.h"
  37 #include "valgrind.h"
  38
  39
  40 #define STRNLEN(soname, fnname)                                         \
  41    SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname) ( const char* str, SizeT n ); \
  42    SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname) ( const char* str, SizeT n ) \
  43    {                                                                    \
  44       SizeT i = 0;                                                      \
  45       while (i < n && str[i] != 0) i++;                                 \
  46       return i;                                                         \
  47    }
  48
  49 #if defined(VGO_linux)
  50  STRNLEN(VG_Z_LIBC_SONAME, strnlen)
  51 #elif defined(VGO_darwin)
  52  STRNLEN(VG_Z_LIBC_SONAME, strnlen)
  53 #endif
  54
  55
  56 // Note that this replacement often doesn't get used because gcc inlines
  57 // calls to strlen() with its own built-in version.  This can be very
  58 // confusing if you aren't expecting it.  Other small functions in this file
  59 // may also be inline by gcc.
  60 #define STRLEN(soname, fnname)                                          \
  61    SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname)( const char* str );      \
  62    SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname)( const char* str )       \
  63    {                                                                    \
  64       SizeT i = 0;                                                      \
  65       while (str[i] != 0) i++;                                          \
  66       return i;                                                         \
  67    }
  68
  69 #if defined(VGO_linux)
  70  STRLEN(VG_Z_LIBC_SONAME,          strlen)
  71  STRLEN(VG_Z_LD_LINUX_SO_2,        strlen)
  72  STRLEN(VG_Z_LD_LINUX_X86_64_SO_2, strlen)
  73 #elif defined(VGO_darwin)
  74  STRLEN(VG_Z_LIBC_SONAME,          strlen)
  75 #endif
  76
  77 /*--------------------------------------------------------------------*/
  78 /*--- end                                                          ---*/
  79 /*--------------------------------------------------------------------*/