byteswap.h 1.4 KB

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  1. /* Copyright (C) 1997 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, see
  13. <http://www.gnu.org/licenses/>. */
  14. #ifndef _BYTESWAP_H
  15. #define _BYTESWAP_H 1
  16. /* Get the machine specific, optimized definitions. */
  17. #include <bits/byteswap.h>
  18. /* The following definitions must all be macros since otherwise some
  19. of the possible optimizations are not possible. */
  20. /* Return a value with all bytes in the 16 bit argument swapped. */
  21. #define bswap_16(x) __bswap_16 (x)
  22. /* Return a value with all bytes in the 32 bit argument swapped. */
  23. #define bswap_32(x) __bswap_32 (x)
  24. #if defined __GNUC__ && __GNUC__ >= 2
  25. /* Return a value with all bytes in the 64 bit argument swapped. */
  26. # define bswap_64(x) __bswap_64 (x)
  27. #endif
  28. #endif /* byteswap.h */