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/* Look at first character in UTF-16 string.
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Copyright (C) 1999-2002, 2006-2007, 2009-2020 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2001.
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This program is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#if defined IN_LIBUNISTRING
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/* Tell unistr.h to declare u16_mbtouc_unsafe as 'extern', not
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'static inline'. */
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# include "unistring-notinline.h"
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#endif
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/* Specification. */
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#include "unistr.h"
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#if !HAVE_INLINE
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int
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u16_mbtouc_unsafe (ucs4_t *puc, const uint16_t *s, size_t n)
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{
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uint16_t c = *s;
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if (c < 0xd800 || c >= 0xe000)
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{
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*puc = c;
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return 1;
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}
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if (c < 0xdc00)
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{
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if (n >= 2)
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{
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if (s[1] >= 0xdc00 && s[1] < 0xe000)
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{
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*puc = 0x10000 + ((c - 0xd800) << 10) + (s[1] - 0xdc00);
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return 2;
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}
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/* invalid multibyte character */
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}
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else
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{
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/* incomplete multibyte character */
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}
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}
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/* invalid multibyte character */
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*puc = 0xfffd;
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return 1;
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}
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#endif
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