/*
** Copyright 2002, Manuel J. Petit.
** Copyright 2011, Oliver Tappe <zooey@hirschkafer.de>.
** All rights reserved. Distributed under the terms of the NewOS License.
*/

#include <wchar_private.h>


/** Concatenates the source string to the destination, writes
 *      as much as "maxLength" bytes to the dest string.
 *      Always null terminates the string as long as maxLength is
 *      larger than the dest string.
 *      Returns the length of the string that it tried to create
 *      to be able to easily detect string truncation.
 */

size_t
__wcslcat(wchar_t* dest, const wchar_t* source, size_t maxLength)
{
        size_t destLength = __wcsnlen(dest, maxLength);
        size_t i;

        if (destLength == maxLength) {
                // the destination is already full
                return destLength + __wcslen(source);
        }

        dest += destLength;
        maxLength -= destLength;

        for (i = 0; i < maxLength - 1 && *source != L'\0'; ++i)
                *dest++ = *source++;

        *dest = '\0';

        return destLength + i + __wcslen(source);
}


B_DEFINE_WEAK_ALIAS(__wcslcat, wcslcat);