/* make-suffix.c: unconditionally add a filename suffix.

/* make-suffix.c: unconditionally add a filename suffix.

Copyright 1992, 1993, 1995, 2008 Karl Berry.
Copyright 2001, 2005 Olaf Weber.

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>
#include <kpathsea/c-pathch.h>

/* Return a new string: S suffixed with SUFFIX, regardless of what it
was before. This returns a newly allocated string. */

string
make_suffix (const_string s, const_string suffix)
{
string new_s;
const_string dot_pos = strrchr (s, '.');
const_string slash_pos;

for (slash_pos = s + strlen (s) - 1; slash_pos > dot_pos && slash_pos > s;
slash_pos--) {
if (IS_DIR_SEP (*slash_pos))
break;
}

if (dot_pos == NULL || slash_pos > dot_pos )
new_s = concat3 (s, ".", suffix);
else
{
unsigned past_dot_index = dot_pos + 1 - s;

new_s = (string)xmalloc (past_dot_index + strlen (suffix) + 1);
strncpy (new_s, s, dot_pos + 1 - s);
strcpy (new_s + past_dot_index, suffix);
}

return new_s;
}