/*
 *	aegis - project change supervisor
 *	Copyright (C) 1998 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 trim_directos
 */

#include <mem.h>
#include <sub.h>
#include <sub/trim_directo.h>
#include <trace.h>
#include <wstr_list.h>


wstring_ty *
sub_trim_directory(scp, arg)
	sub_context_ty	*scp;
	wstring_list_ty	*arg;
{
	wstring_ty	*dir;
	wchar_t		*wcp;
	wstring_ty	*result;
	string_ty	*s;
	long		n;

	trace(("sub_trim_directory()\n{\n"/*}*/));
	n = 1;
	switch (arg->nitems)
	{
	default:
		sub_context_error_set(scp, i18n("requires one argument"));
		trace(("return NULL;\n"));
		trace((/*{*/"}\n"));
		return 0;

	case 2:
		n = 1;
		dir = arg->item[1];
		break;

	case 3:
		s = wstr_to_str(arg->item[1]);
		n = atol(s->str_text);
		trace(("n = %ld;\n", n));
		str_free(s);

		dir = arg->item[2];
		break;
	}

	/*
	 * Skip the given number of leading directory components.
	 */
	wcp = dir->wstr_text;
	while (n-- > 0)
	{
		wchar_t *ep = wcp;
		while (*ep && *ep != '/')
			++ep;
		if (!*ep)
			break;
		wcp = ep + 1;
	}

	/*
	 * Build the result.
	 */
	result = wstr_from_wc(wcp);
	trace(("return %8.8lX;\n", (long)result));
	trace((/*{*/"}\n"));
	return result;
}