/*
 *	aegis - project change supervisor
 *	Copyright (C) 2002, 2003 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 delta2changes
 */

#include <change/branch.h>
#include <fstrcmp.h>
#include <sub.h>


long
change_history_change_by_delta(change_ty *cp, long delta_number)
{
    cstate_ty       *cstate_data;
    cstate_branch_history_list_ty *h;
    size_t	    j;
    sub_context_ty  *scp;

    cstate_data = change_cstate_get(cp);
    if (!cstate_data->branch)
	goto useless;
    h = cstate_data->branch->history;
    if (!h)
	goto useless;
    if (!h->length)
	goto useless;
    for (j = 0; j < h->length; ++j)
    {
	cstate_branch_history_ty *he;

	he = h->list[j];
	if (he->delta_number == delta_number)
	    return he->change_number;
    }

    useless:
    scp = sub_context_new();
    sub_var_set_long(scp, "Number", delta_number);
    change_fatal(cp, scp, i18n("no delta $number"));
    /* NOTREACHED */
    sub_context_delete(scp);
    return 0;
}
