glibc/string/swab.c

/* Copyright (C) 1992, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <unistd.h>

void
swab (const void *bfrom, void *bto, ssize_t n)
{
  const char *from = (const char *) bfrom;
  char *to = (char *) bto;

  n &= ~((ssize_t) 1);
  while (n > 1)
    {
      const char b0 = from[--n], b1 = from[--n];
      to[n] = b0;
      to[n + 1] = b1;
    }
}