Add a "fork" of musl as //fusl.

fusl/src/time/wcsftime.c

Index: fusl/src/time/wcsftime.c
diff --git a/fusl/src/time/wcsftime.c b/fusl/src/time/wcsftime.c
new file mode 100644
index 0000000000000000000000000000000000000000..638e64f6b445772931bb63171082ebaaaccc861a
--- /dev/null
+++ b/fusl/src/time/wcsftime.c
@@ -0,0 +1,71 @@
+#include <wchar.h>
+#include <time.h>
+#include <locale.h>
+#include "locale_impl.h"
+#include "libc.h"
+
+const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc);
+
+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 plus;
+	unsigned long width;
+	for (l=0; l<n; f++) {
+		if (!*f) {
+			s[l] = 0;
+			return l;
+		}
+		if (*f != '%') {
+			s[l++] = *f;
+			continue;
+		}
+		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);
+		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);
+}
+
+weak_alias(__wcsftime_l, wcsftime_l);