strlcpy.c 1.6 KB

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  1. /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
  2. /*
  3. * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  4. *
  5. * Permission to use, copy, modify, and distribute this software for any
  6. * purpose with or without fee is hereby granted, provided that the above
  7. * copyright notice and this permission notice appear in all copies.
  8. *
  9. * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10. * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11. * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12. * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13. * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14. * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15. * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16. */
  17. /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
  18. #include "file.h"
  19. #include <sys/types.h>
  20. #include <string.h>
  21. /*
  22. * Copy src to string dst of size siz. At most siz-1 characters
  23. * will be copied. Always NUL terminates (unless siz == 0).
  24. * Returns strlen(src); if retval >= siz, truncation occurred.
  25. */
  26. size_t
  27. strlcpy(char *dst, const char *src, size_t siz)
  28. {
  29. char *d = dst;
  30. const char *s = src;
  31. size_t n = siz;
  32. /* Copy as many bytes as will fit */
  33. if (n != 0 && --n != 0) {
  34. do {
  35. if ((*d++ = *s++) == 0)
  36. break;
  37. } while (--n != 0);
  38. }
  39. /* Not enough room in dst, add NUL and traverse rest of src */
  40. if (n == 0) {
  41. if (siz != 0)
  42. *d = '\0'; /* NUL-terminate dst */
  43. while (*s++)
  44. ;
  45. }
  46. return(s - src - 1); /* count does not include NUL */
  47. }