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-rw-r--r--lib/mbtowc-impl.h44
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diff --git a/lib/mbtowc-impl.h b/lib/mbtowc-impl.h
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+/* Convert multibyte character to wide character.
+ Copyright (C) 2011-2012 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2011.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* We don't need a static internal state, because the encoding is not state
+ dependent, and when mbrtowc returns (size_t)(-2). we throw the result
+ away. */
+
+int
+mbtowc (wchar_t *pwc, const char *s, size_t n)
+{
+ if (s == NULL)
+ return 0;
+ else
+ {
+ mbstate_t state;
+ wchar_t wc;
+ size_t result;
+
+ memset (&state, 0, sizeof (mbstate_t));
+ result = mbrtowc (&wc, s, n, &state);
+ if (result == (size_t)-1 || result == (size_t)-2)
+ {
+ errno = EILSEQ;
+ return -1;
+ }
+ if (pwc != NULL)
+ *pwc = wc;
+ return (wc == 0 ? 0 : result);
+ }
+}