kc3-lang/gnulib/lib/byteswap.in.h

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• Hash : 226b0092
  Author :
  Date : 2025-09-13T13:01:00
  

  endian: port to Solaris 11.4 and macOS 15
  
  Problem reported by Bruno Haible in:
  https://lists.gnu.org/r/bug-gnulib/2025-09/msg00174.html
  * lib/byteswap.in.h (_GL_BYTESWAP_INLINE):
  Define before including stdint.h.
  * lib/endian.in.h (bswap_16, bswap_32, bswap_64):
  Declare as _GL_BYTESWAP_INLINE rather than as extern.
  Conditionalize these decls with _GL_BYTESWAP_INLINE rather than
  with _GL_BYTESWAP_H.
  

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• lib/byteswap.in.h

• /* byteswap.h - Byte swapping
     Copyright (C) 2005, 2007, 2009-2025 Free Software Foundation, Inc.
     Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #ifndef _GL_BYTESWAP_H
  #define _GL_BYTESWAP_H 1
  
  /* This file uses _GL_INLINE.  */
  #if !_GL_CONFIG_H_INCLUDED
   #error "Please include config.h first."
  #endif
  
  /* Define this now, rather than after including stdint.h, in case
     stdint.h recursively includes us.  This is for Gnulib endian.h.  */
  #ifndef _GL_BYTESWAP_INLINE
  # define _GL_BYTESWAP_INLINE _GL_INLINE
  #endif
  
  #include <stdint.h>
  
  _GL_INLINE_HEADER_BEGIN
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
  # define _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 true
  #elif defined __has_builtin
  # if __has_builtin (__builtin_bswap16)
  #  define _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 true
  # endif
  #endif
  
  #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
  # define _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 true
  # define _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 true
  #elif defined __has_builtin
  # if __has_builtin (__builtin_bswap32)
  #  define _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 true
  # endif
  # if __has_builtin (__builtin_bswap64)
  #  define _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 true
  # endif
  #endif
  
  /* Given an unsigned 16-bit argument X, return the value corresponding to
     X with reversed byte order.  */
  _GL_BYTESWAP_INLINE uint_least16_t
  bswap_16 (uint_least16_t x)
  {
  #ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP16
    return __builtin_bswap16 (x);
  #else
    uint_fast16_t mask = 0xff;
    return (  (x & mask << 8 * 1) >> 8 * 1
            | (x & mask << 8 * 0) << 8 * 1);
  #endif
  }
  
  /* Given an unsigned 32-bit argument X, return the value corresponding to
     X with reversed byte order.  */
  _GL_BYTESWAP_INLINE uint_least32_t
  bswap_32 (uint_least32_t x)
  {
  #ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP32
    return __builtin_bswap32 (x);
  #else
    uint_fast32_t mask = 0xff;
    return (  (x & mask << 8 * 3) >> 8 * 3
            | (x & mask << 8 * 2) >> 8 * 1
            | (x & mask << 8 * 1) << 8 * 1
            | (x & mask << 8 * 0) << 8 * 3);
  #endif
  }
  
  #ifdef UINT_LEAST64_MAX
  /* Given an unsigned 64-bit argument X, return the value corresponding to
     X with reversed byte order.  */
  _GL_BYTESWAP_INLINE uint_least64_t
  bswap_64 (uint_least64_t x)
  {
  # ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP64
    return __builtin_bswap64 (x);
  # else
    uint_fast64_t mask = 0xff;
    return (  (x & mask << 8 * 7) >> 8 * 7
            | (x & mask << 8 * 6) >> 8 * 5
            | (x & mask << 8 * 5) >> 8 * 3
            | (x & mask << 8 * 4) >> 8 * 1
            | (x & mask << 8 * 3) << 8 * 1
            | (x & mask << 8 * 2) << 8 * 3
            | (x & mask << 8 * 1) << 8 * 5
            | (x & mask << 8 * 0) << 8 * 7);
  # endif
  }
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  
  _GL_INLINE_HEADER_END
  
  #endif /* _GL_BYTESWAP_H */
  

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