/*-*- 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 "third_party/musl/time_impl.h"
#include "libc/str/str.h"
#include "libc/str/locale.internal.h"
__static_yoink("musl_libc_notice");

size_t wcsftime_l(wchar_t *restrict s, size_t n, const wchar_t *restrict f, const struct tm *restrict tm, locale_t loc)
{
	size_t l, k;
	char buf[100];
	wchar_t wbuf[100];
	wchar_t *p;
	const char *t_mb;
	const wchar_t *t;
	int pad, plus;
	unsigned long width;
	for (l=0; l<n; f++) {
		if (!*f) {
			s[l] = 0;
			return l;
		}
		if (*f != '%') {
			s[l++] = *f;
			continue;
		}
		f++;
		pad = 0;
		if (*f == '-' || *f == '_' || *f == '0') pad = *f++;
		if ((plus = (*f == '+'))) f++;
		width = wcstoul(f, &p, 10);
		if (*p == 'C' || *p == 'F' || *p == 'G' || *p == 'Y') {
			if (!width && p!=f) width = 1;
		} else {
			width = 0;
		}
		f = p;
		if (*f == 'E' || *f == 'O') f++;
		t_mb = __strftime_fmt_1(&buf, &k, *f, tm, loc, pad);
		if (!t_mb) break;
		k = mbstowcs(wbuf, t_mb, sizeof wbuf / sizeof *wbuf);
		if (k == (size_t)-1) return 0;
		t = wbuf;
		if (width) {
			for (; *t=='+' || *t=='-' || (*t=='0'&&t[1]); t++, k--);
			width--;
			if (plus && tm->tm_year >= 10000-1900)
				s[l++] = '+';
			else if (tm->tm_year < -1900)
				s[l++] = '-';
			else
				width++;
			for (; width > k && l < n; width--)
				s[l++] = '0';
		}
		if (k >= n-l) k = n-l;
		wmemcpy(s+l, t, k);
		l += k;
	}
	if (n) {
		if (l==n) l=n-1;
		s[l] = 0;
	}
	return 0;
}

size_t wcsftime(wchar_t *restrict wcs, size_t n, const wchar_t *restrict f, const struct tm *restrict tm)
{
	return wcsftime_l(wcs, n, f, tm, CURRENT_LOCALE);
}