From 9039553c15c70fc7f648abf9419738cfa462aaa9 Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Mon, 16 Sep 2013 15:37:27 +0200
Subject: [PATCH] Add wmemmove(3).

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

diff --git a/libc/Makefile b/libc/Makefile
index d898febc..e87a5978 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -202,6 +202,7 @@ wchar/wcsxfrm.o \
 wchar/wmemchr.o \
 wchar/wmemcmp.o \
 wchar/wmemcpy.o \
+wchar/wmemmove.o \
 wctype/wctype.o \
 
 HOSTEDOBJS=\
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index 96a2c147..7d384223 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -90,6 +90,7 @@ size_t wcsxfrm(wchar_t* __restrict, const wchar_t* __restrict, size_t);
 wchar_t* wmemchr(const wchar_t*, wchar_t, size_t);
 int wmemcmp(const wchar_t*, const wchar_t*, size_t);
 wchar_t* wmemcpy(wchar_t* __restrict, const wchar_t* __restrict, size_t);
+wchar_t* wmemmove(wchar_t*, const wchar_t*, size_t);
 
 /* TODO: These are not implemented in sortix libc yet. */
 #if defined(__SORTIX_SHOW_UNIMPLEMENTED)
@@ -117,7 +118,6 @@ int wscanf(const wchar_t* __restrict, ...);
 long double wcstold(const wchar_t* __restrict, wchar_t** __restrict);
 size_t wcsftime(wchar_t* __restrict, size_t, const wchar_t* __restrict, const struct tm* __restrict);
 wchar_t* fgetws(wchar_t* __restrict, int, FILE* __restrict);
-wchar_t* wmemmove(wchar_t*, const wchar_t*, size_t);
 wchar_t* wmemset(wchar_t*, wchar_t, size_t);
 wint_t btowc(int);
 wint_t fgetwc(FILE*);
diff --git a/libc/wchar/wmemmove.cpp b/libc/wchar/wmemmove.cpp
new file mode 100644
index 00000000..1331f71f
--- /dev/null
+++ b/libc/wchar/wmemmove.cpp
@@ -0,0 +1,37 @@
+/*******************************************************************************
+
+    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/wmemmove.cpp
+    Copy wide memory between potentially overlapping regions.
+
+*******************************************************************************/
+
+#include <stdint.h>
+#include <wchar.h>
+
+extern "C" wchar_t* wmemmove(wchar_t* dst, const wchar_t* src, size_t n)
+{
+	if ( (uintptr_t) dst < (uintptr_t) src )
+		for ( size_t i = 0; i < n; i++ )
+			dst[i] = src[i];
+	else
+		for ( size_t i = 0; i < n; i++ )
+			dst[n-i] = src[n-i];
+	return dst;
+}