673a2e0136
Implemented according to https://en.wikipedia.org/wiki/UTF-8 Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/****************************************************************************
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* libs/libc/wchar/lib_wcrtomb.c
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <wchar.h>
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#include <errno.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: wcrtomb
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*
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* Description:
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* Convert a wide character to a multibyte sequence
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*
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****************************************************************************/
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size_t wcrtomb(FAR char *s, wchar_t wc, FAR mbstate_t *ps)
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{
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if (s == NULL)
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{
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return 0;
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}
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else if ((unsigned)wc < 0x80)
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{
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*s = wc;
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return 1;
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}
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else if ((unsigned)wc < 0x800)
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{
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*s++ = 0xc0 | (wc >> 6);
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*s = 0x80 | (wc & 0x3f);
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return 2;
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}
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else if ((unsigned)wc < 0xd800 || (unsigned)wc <= 0xffff)
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{
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*s++ = 0xe0 | (wc >> 12);
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*s++ = 0x80 | ((wc >> 6) & 0x3f);
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*s = 0x80 | (wc & 0x3f);
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return 3;
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}
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else if ((unsigned long)wc < 0x110000)
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{
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*s++ = 0xf0 | ((unsigned long)wc >> 18);
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*s++ = 0x80 | ((wc >> 12) & 0x3f);
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*s++ = 0x80 | ((wc >> 6) & 0x3f);
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*s = 0x80 | (wc & 0x3f);
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return 4;
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}
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set_errno(EILSEQ);
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return -1;
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}
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