1/* Search character in piece of UTF-16 string.
2   Copyright (C) 1999, 2002, 2006-2007, 2009-2010 Free Software Foundation,
3   Inc.
4   Written by Bruno Haible <bruno@clisp.org>, 2002.
5
6   This program is free software: you can redistribute it and/or modify it
7   under the terms of the GNU Lesser General Public License as published
8   by the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18
19#include <config.h>
20
21/* Specification.  */
22#include "unistr.h"
23
24uint16_t *
25u16_chr (const uint16_t *s, size_t n, ucs4_t uc)
26{
27  uint16_t c[2];
28
29  if (uc < 0x10000)
30    {
31      uint16_t c0 = uc;
32
33      for (; n > 0; s++, n--)
34        {
35          if (*s == c0)
36            return (uint16_t *) s;
37        }
38    }
39  else
40    switch (u16_uctomb_aux (c, uc, 2))
41      {
42      case 2:
43        if (n > 1)
44          {
45            uint16_t c0 = c[0];
46            uint16_t c1 = c[1];
47
48            for (n--; n > 0; s++, n--)
49              {
50                if (*s == c0 && s[1] == c1)
51                  return (uint16_t *) s;
52              }
53          }
54        break;
55      }
56  return NULL;
57}
58