1/* Store a character in UTF-16 string.
2   Copyright (C) 2002, 2005-2006, 2009-2010 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2002.
4
5   This program is free software: you can redistribute it and/or modify it
6   under the terms of the GNU Lesser General Public License as published
7   by the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program 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 License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <config.h>
19
20#if defined IN_LIBUNISTRING
21/* Tell unistr.h to declare u16_uctomb as 'extern', not 'static inline'.  */
22# include "unistring-notinline.h"
23#endif
24
25/* Specification.  */
26#include "unistr.h"
27
28#if !HAVE_INLINE
29
30int
31u16_uctomb (uint16_t *s, ucs4_t uc, int n)
32{
33  if (uc < 0xd800)
34    {
35      if (n > 0)
36        {
37          s[0] = uc;
38          return 1;
39        }
40      /* else return -2, below.  */
41    }
42  else if (uc < 0x10000)
43    {
44      if (uc >= 0xe000)
45        {
46          if (n >= 1)
47            {
48              s[0] = uc;
49              return 1;
50            }
51        }
52      else
53        return -1;
54    }
55  else
56    {
57      if (uc < 0x110000)
58        {
59          if (n >= 2)
60            {
61              s[0] = 0xd800 + ((uc - 0x10000) >> 10);
62              s[1] = 0xdc00 + ((uc - 0x10000) & 0x3ff);
63              return 2;
64            }
65        }
66      else
67        return -1;
68    }
69  return -2;
70}
71
72#endif
73