1/*
2 * Copyright (C) 1999-2001 Free Software Foundation, Inc.
3 * This file is part of the GNU LIBICONV Library.
4 *
5 * The GNU LIBICONV Library is free software; you can redistribute it
6 * and/or modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * The GNU LIBICONV Library is distributed in the hope that it will be
11 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
17 * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
18 * Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21/*
22 * UCS-2-SWAPPED = UCS-2-INTERNAL with inverted endianness
23 */
24
25static int
26ucs2swapped_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
27{
28  /* This function assumes that 'unsigned short' has exactly 16 bits. */
29  if (sizeof(unsigned short) != 2) abort();
30
31  if (n >= 2) {
32    unsigned short x = *(const unsigned short *)s;
33    x = (x >> 8) | (x << 8);
34    if (x >= 0xd800 && x < 0xe000) {
35      return RET_ILSEQ;
36    } else {
37      *pwc = x;
38      return 2;
39    }
40  }
41  return RET_TOOFEW(0);
42}
43
44static int
45ucs2swapped_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
46{
47  /* This function assumes that 'unsigned short' has exactly 16 bits. */
48  if (sizeof(unsigned short) != 2) abort();
49
50  if (wc < 0x10000 && !(wc >= 0xd800 && wc < 0xe000)) {
51    if (n >= 2) {
52      unsigned short x = wc;
53      x = (x >> 8) | (x << 8);
54      *(unsigned short *)r = x;
55      return 2;
56    } else
57      return RET_TOOSMALL;
58  } else
59    return RET_ILUNI;
60}
61