lib/number/z/is_valid.cc

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//
// canola - canon canola 1614p emulator
// Copyright (C) 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, version 3, as
// published by the Free Software Foundation.
//
// 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 <lib/number/z.h>


bool
number_z::is_valid(void)
    const
{
    if (digits_used > digits_allocated)
        return false;
    if (!digits != !digits_allocated)
        return false;
    if (digits_used != 0 && digits[digits_used - 1] == 0)
        return false;
    for (size_t j = 0; j < digits_used; ++j)
    {
        if (digits[j] >= 10)
            return false;
    }
    for (size_t j = digits_used; j < digits_allocated; ++j)
    {
        if (digits[j] != 0)
            return false;
    }
    return true;
}


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