Provide some more wide char functions.

library/include/wchar.h

@@ -192,7 +192,7 @@ extern size_t mbsrtowcs(wchar_t *restrict dst, const char **restrict src, size_t
 extern size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict ps);
 extern int wcscoll(const wchar_t *ws1, const wchar_t *ws2);
 extern int wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t loc);
-extern size_t wcscspn(const wchar_t *ws1, const wchar_t *ws2);
+extern size_t wcscspn(const wchar_t *s, const wchar_t *c);
 extern size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict src, size_t nwc, size_t len, mbstate_t *restrict ps);
 extern wchar_t * wcsrchr(const wchar_t *ws, wchar_t wc);
 extern size_t wcsrtombs(char *restrict dst, const wchar_t **restrict src, size_t len, mbstate_t *restrict ps);

library/libc.gmk

@@ -402,6 +402,7 @@ C_LIB := \
 	wchar_wcschr.o \
 	wchar_wcscmp.o \
 	wchar_wcscpy.o \
+	wchar_wcscspn.o \
 	wchar_wcsftime.o \
 	wchar_wcslen.o \
 	wchar_wcsncat.o \

library/wchar_mbsinit.c

@@ -40,6 +40,5 @@
 int
 mbsinit(const mbstate_t *ps)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return !ps || !*(unsigned *)ps;
 }

library/wchar_wcschr.c

@@ -37,9 +37,12 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wcschr(const wchar_t *s, wchar_t c)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	if (!c) return (wchar_t *)s + wcslen(s);
+	for (; *s && *s != c; s++);
+	return *s ? (wchar_t *)s : 0;
 }

library/wchar_wcscspn.c

@@ -0,0 +1,50 @@
+/*
+ * $Id: wchar_wcsspn.c,v 1.3 2006-01-08 12:04:27 obarthel Exp $
+ *
+ * :ts=4
+ *
+ * Portable ISO 'C' (1994) runtime library for the Amiga computer
+ * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   - Neither the name of Olaf Barthel nor the names of contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _WCHAR_HEADERS_H
+#include "wchar_headers.h"
+#endif /* _WCHAR_HEADERS_H */
+
+/****************************************************************************/
+
+/* Implementation based on musl */
+
+size_t
+wcscspn(const wchar_t *s, const wchar_t *c)
+{
+	const wchar_t *a;
+	if (!c[0]) return wcslen(s);
+	if (!c[1]) return (s=wcschr(a=s, *c)) ? (size_t)(s-a) : wcslen(a);
+	for (a=s; *s && !wcschr(c, *s); s++);
+	return s-a;
+}

library/wchar_wcsncmp.c

@@ -37,9 +37,11 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 int
 wcsncmp(const wchar_t *s1, const wchar_t *s2, size_t n)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	for (; n && *s1==*s2 && *s1 && *s2; n--, s1++, s2++);
+	return n ? *s1 - *s2 : 0;
 }

library/wchar_wcsncpy.c

@@ -37,9 +37,13 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wcsncpy(wchar_t *dest, const wchar_t *src, size_t n)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	wchar_t *a = dest;
+	while (n && *src) n--, *dest++ = *src++;
+	wmemset(dest, 0, n);
+	return a;
 }