From 34935845b410cfd0972aa4c0301a5c18d1cfcb0b Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Wed, 28 May 2014 20:13:36 +0200
Subject: [PATCH] Add wcpncpy(3).

---
 libc/Makefile          |  1 +
 libc/include/wchar.h   |  2 +-
 libc/wchar/wcpncpy.cpp | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 libc/wchar/wcpncpy.cpp

diff --git a/libc/Makefile b/libc/Makefile
index 8edf0cc3..78de61a2 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -243,6 +243,7 @@ wchar/mbsinit.o \
 wchar/mbsnrtowcs.o \
 wchar/mbsrtowcs.o \
 wchar/wcpcpy.o \
+wchar/wcpncpy.o \
 wchar/wcrtomb.o \
 wchar/wcscat.o \
 wchar/wcschrnul.o \
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index b6764040..cdc0087e 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -198,7 +198,7 @@ int wcwidth(wchar_t);
 size_t mbsnrtowcs(wchar_t* __restrict, const char** __restrict, size_t, size_t, mbstate_t* __restrict);
 /* TODO: FILE* open_wmemstream(wchar_t**, size_t*); */
 wchar_t* wcpcpy(wchar_t* __restrict, const wchar_t* __restrict);
-/* TODO: wchar_t* wcpncpy(wchar_t* __restrict, const wchar_t* __restrict, size_t); */
+wchar_t* wcpncpy(wchar_t* __restrict, const wchar_t* __restrict, size_t);
 /* TODO: int wcscasecmp(const wchar_t*, const wchar_t*); */
 /* TODO: int wcscasecmp_l(const wchar_t*, const wchar_t*, locale_t); */
 /* TODO: int wcscoll_l(const wchar_t*, const wchar_t*, locale_t); */
diff --git a/libc/wchar/wcpncpy.cpp b/libc/wchar/wcpncpy.cpp
new file mode 100644
index 00000000..ddfa5514
--- /dev/null
+++ b/libc/wchar/wcpncpy.cpp
@@ -0,0 +1,37 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2014.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    wchar/wcpncpy.cpp
+    Copies a string into a fixed size buffer and returns last byte.
+
+*******************************************************************************/
+
+#include <wchar.h>
+
+extern "C"
+wchar_t* wcpncpy(wchar_t* restrict dest, const wchar_t* restrict src, size_t n)
+{
+	size_t i;
+	for ( i = 0; i < n && src[i] != L'\0'; i++ )
+		dest[i] = src[i];
+	wchar_t* ret = dest + i;
+	for ( ; i < n; i++ )
+		dest[i] = L'\0';
+	return ret;
+}