/*
 *      aegis - project change supervisor
 *      Copyright (C) 1996, 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 zero_pads
 */

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


wstring_ty *
sub_zero_pad(sub_context_ty *scp, wstring_list_ty *arg)
{
        wstring_ty      *result;
        string_ty       *s;
        long            n;

        trace(("sub_zero_pad()\n{\n"/*}*/));
        if (arg->nitems != 3)
        {
                sub_context_error_set(scp, i18n("requires two arguments"));
                trace(("return NULL;\n"));
                trace((/*{*/"}\n"));
                return 0;
        }
        s = wstr_to_str(arg->item[2]);
        n = atol(s->str_text);
        trace(("n = %ld;\n", n));
        str_free(s);

        if (n <= (long)arg->item[1]->wstr_length)
                result = wstr_copy(arg->item[1]);
        else
        {
                size_t          len;
                char            *buffer;
                string_ty       *s2;
                size_t          j;

                len = n - arg->item[1]->wstr_length;
                s = wstr_to_str(arg->item[1]);
                buffer = (char *)mem_alloc(len + 1);
                for (j = 0; j < len; ++j)
                        buffer[j] = '0';
                buffer[len] = 0;
                s2 = str_format("%s%S", buffer, s);
                trace(("result = \"%s\";\n", s2->str_text));
                mem_free(buffer);
                str_free(s);
                result = str_to_wstr(s2);
                str_free(s2);
        }
        trace(("return %8.8lX;\n", (long)result));
        trace((/*{*/"}\n"));
        return result;
}
