78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/****************************************************************************
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* libs/libc/wchar/lib_wcrtomb.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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