/* extend-fname.c: give a filename a suffix, if necessary.

/* extend-fname.c: give a filename a suffix, if necessary.

Copyright 1992, 1993, 2008 Karl Berry.

This 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 2.1 of the License, or (at your option) any later version.

This 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 this library; if not, see <http://www.gnu.org/licenses/>. */

#include <kpathsea/config.h>

/* We may or may not return NAME. It's up to the caller not to assume
the return value is modifiable. */

const_string
extend_filename (const_string name, const_string default_suffix)
{
const_string new_s;
const_string suffix = find_suffix (name);

new_s = suffix == NULL ? concat3 (name, ".", default_suffix)
: name;
return new_s;
}