strlcpy.c 1.8 KB

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  1. /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
  2. /* $OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $ */
  3. /*
  4. * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  5. *
  6. * Permission to use, copy, modify, and distribute this software for any
  7. * purpose with or without fee is hereby granted, provided that the above
  8. * copyright notice and this permission notice appear in all copies.
  9. *
  10. * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11. * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12. * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13. * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14. * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15. * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16. * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17. */
  18. #include "common.h"
  19. #ifndef HAVE_STRLCPY
  20. #if defined(LIBC_SCCS) && !defined(lint)
  21. static char *rcsid = "$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $";
  22. #endif /* LIBC_SCCS and not lint */
  23. #include <sys/types.h>
  24. #include <string.h>
  25. /*
  26. * Copy src to string dst of size siz. At most siz-1 characters
  27. * will be copied. Always NUL terminates (unless siz == 0).
  28. * Returns strlen(src); if retval >= siz, truncation occurred.
  29. */
  30. size_t
  31. strlcpy(char *dst, const char *src, size_t siz)
  32. {
  33. register char *d = dst;
  34. register const char *s = src;
  35. register size_t n = siz;
  36. /* Copy as many bytes as will fit */
  37. if (n != 0 && --n != 0) {
  38. do {
  39. if ((*d++ = *s++) == 0)
  40. break;
  41. } while (--n != 0);
  42. }
  43. /* Not enough room in dst, add NUL and traverse rest of src */
  44. if (n == 0) {
  45. if (siz != 0)
  46. *d = '\0'; /* NUL-terminate dst */
  47. while (*s++)
  48. ;
  49. }
  50. return(s - src - 1); /* count does not include NUL */
  51. }
  52. #endif /* !HAVE_STRLCPY */