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-rw-r--r--gl/wcrtomb.c53
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1/* Convert wide character to multibyte character.
2 Copyright (C) 2008 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2008.
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#include <config.h>
19
20/* Specification. */
21#include <wchar.h>
22
23#include <errno.h>
24#include <stdlib.h>
25
26
27size_t
28wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
29{
30 /* This implementation of wcrtomb on top of wctomb() supports only
31 stateless encodings. ps must be in the initial state. */
32 if (ps != NULL && !mbsinit (ps))
33 {
34 errno = EINVAL;
35 return (size_t)(-1);
36 }
37
38 if (s == NULL)
39 /* We know the NUL wide character corresponds to the NUL character. */
40 return 1;
41 else
42 {
43 int ret = wctomb (s, wc);
44
45 if (ret >= 0)
46 return ret;
47 else
48 {
49 errno = EILSEQ;
50 return (size_t)(-1);
51 }
52 }
53}