New modules 'unistr/u8-move', 'unistr/u16-move', 'unistr/u32-move'.

[gnulib.git] / lib / unistr / u-move.h

diff --git a/lib/unistr/u-move.h b/lib/unistr/u-move.h
new file mode 100644 (file)
index 0000000..46f5be0
--- /dev/null
+++ b/lib/unistr/u-move.h
@@ -0,0 +1,46 @@
+/* Copy piece of UTF-8/UTF-16/UTF-32 string.
+   Copyright (C) 1999, 2002, 2006 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published
+   by the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#include <string.h>
+
+UNIT *
+FUNC (UNIT *dest, const UNIT *src, size_t n)
+{
+#if 0
+  if (dest < src)
+    {
+      UNIT *destptr = dest;
+      const UNIT *srcptr = src;
+
+      for (; n > 0; n--)
+       *destptr++ = *srcptr++;
+    }
+  else if (dest > src)
+    {
+      UNIT *destptr = dest + n - 1;
+      const UNIT *srcptr = src + n - 1;
+
+      for (; n > 0; n--)
+       *destptr-- = *srcptr--;
+    }
+#else
+  memmove ((char *) dest, (const char *) src, n * sizeof (UNIT));
+#endif
+  return dest;
+}