New module 'wcsncpy'.

* modules/wcsncpy: New file.
* lib/wchar.in.h (wcsncpy): New declaration.
* lib/wcsncpy.c: New file.
* lib/wcsncpy-impl.h: New file, from libutf8 with modifications.
* m4/wcsncpy.m4: New file.
* m4/wchar_h.m4 (gl_WCHAR_H): Test whether wcsncpy is declared.
(gl_WCHAR_H_DEFAULTS): Initialize GNULIB_WCSNCPY, HAVE_WCSNCPY.
* modules/wchar (Makefile.am): Substitute GNULIB_WCSNCPY, HAVE_WCSNCPY.
* tests/test-wchar-c++.cc: Test the declaration of wcsncpy.
* doc/posix-functions/wcsncpy.texi: Mention the new module.

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/wcsncpy-impl.h b/lib/wcsncpy-impl.h
new file mode 100644
index 0000000000..63925bbaa9
--- /dev/null
+++ b/lib/wcsncpy-impl.h
@@ -0,0 +1,32 @@
+/* Copy a size-bounded wide string.
+   Copyright (C) 1999, 2011 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 1999.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+wchar_t *
+wcsncpy (wchar_t *dest, const wchar_t *src, size_t n)
+{
+  wchar_t *destptr = dest;
+
+  for (; n > 0 && (*destptr = *src) != (wchar_t)'\0'; src++, destptr++, n--)
+    ;
+
+  /* This behavior is rarely useful, but it is specified by the ISO C
+     standard.  */
+  for (; n > 0; n--)
+    *destptr++ = (wchar_t)'\0';
+
+  return dest;
+}