diff --git a/library/wchar_wcscmp.c b/library/wchar_wcscmp.c
index 0c8103d..c12ff67 100644
--- a/library/wchar_wcscmp.c
+++ b/library/wchar_wcscmp.c
@@ -40,6 +40,6 @@
 int
 wcscmp(const wchar_t *s1, const wchar_t * s2)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	for (; *s1==*s2 && *s1 && *s2; s1++, s2++);
+	return *s1 - *s2;
 }
diff --git a/library/wchar_wcscpy.c b/library/wchar_wcscpy.c
index 94b2ad9..d71fa25 100644
--- a/library/wchar_wcscpy.c
+++ b/library/wchar_wcscpy.c
@@ -40,6 +40,7 @@
 wchar_t *
 wcscpy(wchar_t *dest, const wchar_t *src)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	wchar_t *a = dest;
+	while ((*dest++ = *src++));
+	return a;
 }
diff --git a/library/wchar_wcslen.c b/library/wchar_wcslen.c
index 9ecc861..cc7393a 100644
--- a/library/wchar_wcslen.c
+++ b/library/wchar_wcslen.c
@@ -37,9 +37,12 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 size_t
 wcslen(const wchar_t *s)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	const wchar_t *a;
+	for (a=s; *s; s++);
+	return s-a;
 }
diff --git a/library/wchar_wcsncat.c b/library/wchar_wcsncat.c
index 3155dc0..c993592 100644
--- a/library/wchar_wcsncat.c
+++ b/library/wchar_wcsncat.c
@@ -37,9 +37,14 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wcsncat(wchar_t *dest, const wchar_t *src, size_t n)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	wchar_t *a = dest;
+	dest += wcslen(dest);
+	while (n && *src) n--, *dest++ = *src++;
+	*dest++ = 0;
+	return a;
 }
diff --git a/library/wchar_wctob.c b/library/wchar_wctob.c
index de9a668..704d657 100644
--- a/library/wchar_wctob.c
+++ b/library/wchar_wctob.c
@@ -40,6 +40,6 @@
 int
 wctob(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	if (c < 128U) return c;
+	return EOF;
 }
diff --git a/library/wchar_wmemchr.c b/library/wchar_wmemchr.c
index 840911b..003a40c 100644
--- a/library/wchar_wmemchr.c
+++ b/library/wchar_wmemchr.c
@@ -37,9 +37,11 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wmemchr(const wchar_t *ptr, wchar_t val, size_t len)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	for (; len && *ptr != val; len--, ptr++);
+	return len ? (wchar_t *)ptr : 0;
 }
diff --git a/library/wchar_wmemcmp.c b/library/wchar_wmemcmp.c
index b43fe93..454f348 100644
--- a/library/wchar_wmemcmp.c
+++ b/library/wchar_wmemcmp.c
@@ -37,9 +37,11 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 int
 wmemcmp(const wchar_t *ptr1, const wchar_t *ptr2, size_t len)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	for (; len && *ptr1==*ptr2; len--, ptr1++, ptr2++);
+	return len ? *ptr1-*ptr2 : 0;
 }
diff --git a/library/wchar_wmemcpy.c b/library/wchar_wmemcpy.c
index 230b7c3..95f1b36 100644
--- a/library/wchar_wmemcpy.c
+++ b/library/wchar_wmemcpy.c
@@ -37,9 +37,12 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wmemcpy(wchar_t *dest, const wchar_t *src, size_t len)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	wchar_t *a = dest;
+	while (len--) *dest++ = *src++;
+	return a;
 }
diff --git a/library/wchar_wmemmove.c b/library/wchar_wmemmove.c
index 809ed84..06ffb54 100644
--- a/library/wchar_wmemmove.c
+++ b/library/wchar_wmemmove.c
@@ -37,9 +37,15 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wmemmove(wchar_t *dest, const wchar_t * src, size_t len)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	wchar_t *d0 = dest;
+	if ((size_t)(dest-src) < len)
+		while (len--) dest[len] = src[len];
+	else
+		while (len--) *dest++ = *src++;
+	return d0;
 }
diff --git a/library/wchar_wmemset.c b/library/wchar_wmemset.c
index a593d51..e584832 100644
--- a/library/wchar_wmemset.c
+++ b/library/wchar_wmemset.c
@@ -37,9 +37,12 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 wchar_t *
 wmemset(wchar_t *ptr, int val, size_t len)
 {
-	/* ZZZ unimplemented */
-	return(NULL);
+	wchar_t *ret = ptr;
+	while (len--) *ptr++ = val;
+	return ret;
 }
diff --git a/library/wctype_iswalnum.c b/library/wctype_iswalnum.c
index 14fd7b2..834ff00 100644
--- a/library/wctype_iswalnum.c
+++ b/library/wctype_iswalnum.c
@@ -37,9 +37,10 @@
 
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 int
 iswalnum(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return iswdigit(c) || iswalpha(c);
 }
diff --git a/library/wctype_iswalpha.c b/library/wctype_iswalpha.c
index 8840140..d90c00f 100644
--- a/library/wctype_iswalpha.c
+++ b/library/wctype_iswalpha.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswalpha(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isalpha(c);
 }
diff --git a/library/wctype_iswblank.c b/library/wctype_iswblank.c
index a28f969..11fb9f3 100644
--- a/library/wctype_iswblank.c
+++ b/library/wctype_iswblank.c
@@ -35,11 +35,14 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
+/* Implementation based on musl */
+
 int
 iswblank(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isblank(c);
 }
diff --git a/library/wctype_iswdigit.c b/library/wctype_iswdigit.c
index dcb1595..46e5aeb 100644
--- a/library/wctype_iswdigit.c
+++ b/library/wctype_iswdigit.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswdigit(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isdigit(c);
 }