From 2db8bc088d38afe7464eea10a3d2f4a8cef54c73 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Mon, 16 Sep 2013 00:06:27 +0200
Subject: [PATCH] Add wcsncmp(3).

---
 libc/Makefile          |  1 +
 libc/include/wchar.h   |  2 +-
 libc/wchar/wcsncmp.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 libc/wchar/wcsncmp.cpp

diff --git a/libc/Makefile b/libc/Makefile
index b19e3ae1..e1568ded 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -186,6 +186,7 @@ wchar/wcscpy.o \
 wchar/wcscspn.o \
 wchar/wcslen.o \
 wchar/wcsncat.o \
+wchar/wcsncmp.o \
 wchar/wcsncpy.o \
 wchar/wcsrchr.o \
 wchar/wcsrtombs.o \
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index 22f931c1..cde93fe2 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -74,6 +74,7 @@ wchar_t* wcscpy(wchar_t* __restrict, const wchar_t* __restrict);
 size_t wcscspn(const wchar_t*, const wchar_t*);
 size_t wcslen(const wchar_t*);
 wchar_t* wcsncat(wchar_t* __restrict, const wchar_t* __restrict, size_t);
+int wcsncmp(const wchar_t*, const wchar_t*, size_t);
 wchar_t* wcsncpy(wchar_t* __restrict, const wchar_t* __restrict, size_t);
 wchar_t* wcsrchr(const wchar_t*, wchar_t);
 size_t wcsrtombs(char* __restrict, const wchar_t** __restrict, size_t, mbstate_t* __restrict);
@@ -103,7 +104,6 @@ int vswprintf(wchar_t* __restrict, size_t, const wchar_t* __restrict, va_list);
 int vswscanf(const wchar_t* __restrict, const wchar_t* __restrict, va_list);
 int vwprintf(const wchar_t* __restrict, va_list);
 int vwscanf(const wchar_t* __restrict, va_list);
-int wcsncmp(const wchar_t*, const wchar_t*, size_t);
 int wcswidth(const wchar_t*, size_t);
 int wctob(wint_t);
 int wcwidth(wchar_t);
diff --git a/libc/wchar/wcsncmp.cpp b/libc/wchar/wcsncmp.cpp
new file mode 100644
index 00000000..36100b20
--- /dev/null
+++ b/libc/wchar/wcsncmp.cpp
@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+    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/wcsncmp.cpp
+    Compares a prefix of two wide strings.
+
+*******************************************************************************/
+
+#include <wchar.h>
+
+extern "C" int wcsncmp(const wchar_t* a, const wchar_t* b, size_t n)
+{
+	for ( size_t i = 0; i < n; i++ )
+	{
+		if ( a[i] == L'\0' && b[i] == L'\0' )
+			return 0;
+		if ( a[i] < b[i] )
+			return -1;
+		if ( a[i] > b[i] )
+			return 1;
+	}
+	return 0;
+}