summaryrefslogtreecommitdiff
path: root/string/swab.c
blob: cbd8d570d1ae23ad40bd6ed98d59ad85c80434f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
/* Copyright (C) 1992-2016 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 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.

   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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#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;
    }
}