wcsmbs: optimize wcsncpy

This patch rewrites wcsncpy using wcsnlen, wmemset, and wmemcpy.  This is
similar to the optimization done on strncpy by f6482cf29d and 6423d4754c.

Checked on x86_64-linux-gnu.

	* wcsmbs/wcsncpy.c (__wcsncpy): Rewrite using wcsnlen, wmemset, and
	wmemcpy.

1 files changed, 3 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index d51188cda9..97e70aa0cb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2019-02-27  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* wcsmbs/wcsncpy.c (__wcsncpy): Rewrite using wcsnlen, wmemset, and
+	wmemcpy.
+
 	* wcsmbs/wcsncat.c (wcsncat): Rewrite using wcslen, wcsnlen, and
 	wmemcpy.