memset.c 2.3 KB

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  1. /* $OpenBSD: memset.c,v 1.7 2015/08/31 02:53:57 guenther Exp $ */
  2. /*-
  3. * Copyright (c) 1990 The Regents of the University of California.
  4. * All rights reserved.
  5. *
  6. * This code is derived from software contributed to Berkeley by
  7. * Chris Torek.
  8. *
  9. * Redistribution and use in source and binary forms, with or without
  10. * modification, are permitted provided that the following conditions
  11. * are met:
  12. * 1. Redistributions of source code must retain the above copyright
  13. * notice, this list of conditions and the following disclaimer.
  14. * 2. Redistributions in binary form must reproduce the above copyright
  15. * notice, this list of conditions and the following disclaimer in the
  16. * documentation and/or other materials provided with the distribution.
  17. * 3. Neither the name of the University nor the names of its contributors
  18. * may be used to endorse or promote products derived from this software
  19. * without specific prior written permission.
  20. *
  21. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31. * SUCH DAMAGE.
  32. */
  33. #include <string.h>
  34. #ifdef _TLIBC_USE_INTEL_FAST_STRING_
  35. extern void *_intel_fast_memset(void *, void *, size_t);
  36. #endif
  37. void *
  38. __memset(void *dst, int c, size_t n)
  39. {
  40. if (n != 0) {
  41. unsigned char *d = dst;
  42. do
  43. *d++ = (unsigned char)c;
  44. while (--n != 0);
  45. }
  46. return (dst);
  47. }
  48. void *
  49. memset(void *dst, int c, size_t n)
  50. {
  51. #ifdef _TLIBC_USE_INTEL_FAST_STRING_
  52. return _intel_fast_memset(dst, (void*)c, n);
  53. #else
  54. return __memset(dst, c, n);
  55. #endif /* !_TLIBC_USE_INTEL_FAST_STRING_ */
  56. }