bits/uintn-identity.h

   1 /* Inline functions to return unsigned integer values unchanged.
   2    Copyright (C) 2017-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #if !defined _NETINET_IN_H && !defined _ENDIAN_H
  20 # error "Never use <bits/uintn-identity.h> directly; include <netinet/in.h> or <endian.h> instead."
  21 #endif
  22
  23 #ifndef _BITS_UINTN_IDENTITY_H
  24 #define _BITS_UINTN_IDENTITY_H 1
  25
  26 #include <bits/types.h>
  27
  28 /* These inline functions are to ensure the appropriate type
  29    conversions and associated diagnostics from macros that convert to
  30    a given endianness.  */
  31
  32 static __inline __uint16_t
  33 __uint16_identity (__uint16_t __x)
  34 {
  35   return __x;
  36 }
  37
  38 static __inline __uint32_t
  39 __uint32_identity (__uint32_t __x)
  40 {
  41   return __x;
  42 }
  43
  44 static __inline __uint64_t
  45 __uint64_identity (__uint64_t __x)
  46 {
  47   return __x;
  48 }
  49
  50 #endif /* _BITS_UINTN_IDENTITY_H.  */