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59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
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Copyright © 2005-2020 Rich Felker, et al.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <wchar.h>
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#include <limits.h>
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#include <string.h>
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size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
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{
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const wchar_t *ws = *wcs;
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size_t cnt = 0;
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if (!dst) n=0;
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while (ws && wn) {
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char tmp[MB_LEN_MAX];
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size_t l = wcrtomb(n<MB_LEN_MAX ? tmp : dst, *ws, 0);
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if (l==-1) {
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cnt = -1;
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break;
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}
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if (dst) {
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if (n<MB_LEN_MAX) {
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if (l>n) break;
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memcpy(dst, tmp, l);
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}
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dst += l;
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n -= l;
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}
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if (!*ws) {
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ws = 0;
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break;
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}
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ws++;
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wn--;
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cnt += l;
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}
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if (dst) *wcs = ws;
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return cnt;
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}
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