/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8                                   :vi │
╚──────────────────────────────────────────────────────────────────────────────╝
│                                                                              │
│  Musl Libc                                                                   │
│  Copyright © 2005-2014 Rich Felker, et al.                                   │
│                                                                              │
│  Permission is hereby granted, free of charge, to any person obtaining       │
│  a copy of this software and associated documentation files (the             │
│  "Software"), to deal in the Software without restriction, including         │
│  without limitation the rights to use, copy, modify, merge, publish,         │
│  distribute, sublicense, and/or sell copies of the Software, and to          │
│  permit persons to whom the Software is furnished to do so, subject to       │
│  the following conditions:                                                   │
│                                                                              │
│  The above copyright notice and this permission notice shall be              │
│  included in all copies or substantial portions of the Software.             │
│                                                                              │
│  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,             │
│  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF          │
│  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.      │
│  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY        │
│  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,        │
│  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE           │
│  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                      │
│                                                                              │
╚─────────────────────────────────────────────────────────────────────────────*/
#include <wchar.h>
__static_yoink("musl_libc_notice");

size_t wcsrtombs(char *restrict s, const wchar_t **restrict ws, size_t n, mbstate_t *restrict st)
{
	const wchar_t *ws2;
	char buf[4];
	size_t N = n, l;
	if (!s) {
		for (n=0, ws2=*ws; *ws2; ws2++) {
			if (*ws2 >= 0x80u) {
				l = wcrtomb(buf, *ws2, 0);
				if (!(l+1)) return -1;
				n += l;
			} else n++;
		}
		return n;
	}
	while (n>=4) {
		if (**ws-1u >= 0x7fu) {
			if (!**ws) {
				*s = 0;
				*ws = 0;
				return N-n;
			}
			l = wcrtomb(s, **ws, 0);
			if (!(l+1)) return -1;
			s += l;
			n -= l;
		} else {
			*s++ = **ws;
			n--;
		}
		(*ws)++;
	}
	while (n) {
		if (**ws-1u >= 0x7fu) {
			if (!**ws) {
				*s = 0;
				*ws = 0;
				return N-n;
			}
			l = wcrtomb(buf, **ws, 0);
			if (!(l+1)) return -1;
			if (l>n) return N-n;
			wcrtomb(s, **ws, 0);
			s += l;
			n -= l;
		} else {
			*s++ = **ws;
			n--;
		}
		(*ws)++;
	}
	return N;
}