1/* Search for some characters in UTF-8/UTF-16/UTF-32 string.
2   Copyright (C) 1999, 2002, 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
18size_t
19FUNC (const UNIT *str, const UNIT *accept)
20{
21  /* Optimize two cases.  */
22  if (accept[0] == 0)
23    return 0;
24  {
25    ucs4_t uc;
26    int count = U_STRMBTOUC (&uc, accept);
27    if (count >= 0 && accept[count] == 0)
28      {
29        const UNIT *ptr = str;
30        for (; *ptr != 0; ptr += count)
31          if (U_CMP (ptr, accept, count) != 0)
32            break;
33        return ptr - str;
34      }
35  }
36  /* General case.  */
37  {
38    const UNIT *ptr = str;
39
40    for (;;)
41      {
42        ucs4_t uc;
43        int count = U_STRMBTOUC (&uc, ptr);
44        if (count == 0)
45          return ptr - str;
46        if (count < 0)
47          break;
48        if (!U_STRCHR (accept, uc))
49          return ptr - str;
50        ptr += count;
51      }
52    return U_STRLEN (str);
53  }
54}
55