1  /* Copyright (C) 1992-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <unistd.h>
      19  
      20  void
      21  swab (const void *bfrom, void *bto, ssize_t n)
      22  {
      23    const char *from = (const char *) bfrom;
      24    char *to = (char *) bto;
      25  
      26    n &= ~((ssize_t) 1);
      27    while (n > 1)
      28      {
      29        const char b0 = from[--n], b1 = from[--n];
      30        to[n] = b0;
      31        to[n + 1] = b1;
      32      }
      33  }