__strcpy_chk.cpp 1.9 KB

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  1. /*
  2. * Copyright (C) 2012 The Android Open Source Project
  3. * All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. *
  15. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  17. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  18. * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  19. * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  20. * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21. * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  22. * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  23. * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  25. * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26. * SUCH DAMAGE.
  27. */
  28. #include <string.h>
  29. #include <stdlib.h>
  30. /*
  31. * Runtime implementation of __builtin____strcpy_chk.
  32. *
  33. * See
  34. * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
  35. * http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
  36. * for details.
  37. *
  38. */
  39. extern "C" char *__strcpy_chk (char *dest, const char *src, size_t dest_len) {
  40. // TODO: optimize so we don't scan src twice.
  41. size_t src_len = strlen(src) + 1;
  42. if (__predict_false(src_len > dest_len)) {
  43. /* TODO: add runtime error massage */
  44. abort();
  45. }
  46. return strncpy(dest, src, src_len-1);
  47. }