safe_strncpy.c 748 B

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * Utility routines.
  4. *
  5. * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  6. *
  7. * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  8. */
  9. #include "libbb.h"
  10. /* Like strncpy but make sure the resulting string is always 0 terminated. */
  11. char* FAST_FUNC safe_strncpy(char *dst, const char *src, size_t size)
  12. {
  13. if (!size) return dst;
  14. dst[--size] = '\0';
  15. return strncpy(dst, src, size);
  16. }
  17. /* Like strcpy but can copy overlapping strings. */
  18. void FAST_FUNC overlapping_strcpy(char *dst, const char *src)
  19. {
  20. /* Cheap optimization for dst == src case -
  21. * better to have it here than in many callers.
  22. */
  23. if (dst != src) {
  24. while ((*dst = *src) != '\0') {
  25. dst++;
  26. src++;
  27. }
  28. }
  29. }