/*-*- 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 <stdlib.h>
#include <wchar.h>
#include <errno.h>
#include "multibyte.h"
__static_yoink("musl_libc_notice");

size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st)
{
	if (!s) return 1;
	if ((unsigned)wc < 0x80) {
		*s = wc;
		return 1;
	} else if (MB_CUR_MAX == 1) {
		if (!IS_CODEUNIT(wc)) {
			errno = EILSEQ;
			return -1;
		}
		*s = wc;
		return 1;
	} else if ((unsigned)wc < 0x800) {
		*s++ = 0xc0 | (wc>>6);
		*s = 0x80 | (wc&0x3f);
		return 2;
	} else if ((unsigned)wc < 0xd800 || (unsigned)wc-0xe000 < 0x2000) {
		*s++ = 0xe0 | (wc>>12);
		*s++ = 0x80 | ((wc>>6)&0x3f);
		*s = 0x80 | (wc&0x3f);
		return 3;
	} else if ((unsigned)wc-0x10000 < 0x100000) {
		*s++ = 0xf0 | (wc>>18);
		*s++ = 0x80 | ((wc>>12)&0x3f);
		*s++ = 0x80 | ((wc>>6)&0x3f);
		*s = 0x80 | (wc&0x3f);
		return 4;
	}
	errno = EILSEQ;
	return -1;
}