/*
 * fhist - file history and comparison tools
 * Copyright (C) 1998, 2002, 2008, 2010, 2012 Peter Miller
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <common/ac/stdlib.h>

#include <common/str.h>
#include <common/sub/left.h>
#include <common/sub/private.h>
#include <common/trace.h>
#include <common/wstr_list.h>


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

    trace(("sub_left()\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 <= 0)
        result = wstr_from_c("");
    else if ((size_t)n > arg->item[1]->wstr_length)
        result = wstr_copy(arg->item[1]);
    else
        result = wstr_n_from_wc(arg->item[1]->wstr_text, (size_t)n);
    trace(("return %8.8lX;\n", (long)result));
    trace(("}\n"));
    return result;
}


/* vim: set ts=8 sw=4 et : */
