1/* Convert multibyte character to wide character.
2   Copyright (C) 2011-2014 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2011.
4
5   This program is free software: you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   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
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18/* We don't need a static internal state, because the encoding is not state
19   dependent, and when mbrtowc returns (size_t)(-2). we throw the result
20   away. */
21
22int
23mbtowc (wchar_t *pwc, const char *s, size_t n)
24{
25  if (s == NULL)
26    return 0;
27  else
28    {
29      mbstate_t state;
30      wchar_t wc;
31      size_t result;
32
33      memset (&state, 0, sizeof (mbstate_t));
34      result = mbrtowc (&wc, s, n, &state);
35      if (result == (size_t)-1 || result == (size_t)-2)
36        {
37          errno = EILSEQ;
38          return -1;
39        }
40      if (pwc != NULL)
41        *pwc = wc;
42      return (wc == 0 ? 0 : result);
43    }
44}
45