/*
 *      cook - file construction tool
 *      Copyright (C) 1999, 2006, 2007 Peter Miller;
 *      All rights reserved.
 *
 *      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 2 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, write to the Free Software
 *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate path_cats
 */

#include <common/os_path_cat.h>
#include <common/str.h>


string_ty *
os_path_cat(string_ty *lhs, string_ty *rhs)
{
    static string_ty *dot;
    size_t          lhs_len;

    if (!dot)
        dot = str_from_c(".");
    if (!lhs)
        lhs = dot;
    if (!rhs)
        rhs = dot;
    if (rhs->str_text[0] == '/')
        return str_copy(rhs);
    if (str_equal(lhs, dot))
        return str_copy(rhs);
    if (str_equal(rhs, dot))
        return str_copy(lhs);
    lhs_len = lhs->str_length;
    while (lhs_len > 0 && lhs->str_text[lhs_len - 1] == '/')
        --lhs_len;
    return str_format("%.*s/%s", (int)lhs_len, lhs->str_text, rhs->str_text);
}