lib/number/z/to_long.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/ac/limits.h>

#include <lib/number/z.h>


long
number_z::to_long(void)
    const
{
    switch (digits_used)
    {
    case 0:
        return 0;

    case 1:
        return digits[0];

    default:
        break;
    }
    long long n = 0;
    for (size_t j = digits_used; j > 0; --j)
    {
        n = n * 10 + digits[j - 1];
        if (n > LONG_MAX)
            return LONG_MAX;
    }
    return n;
}


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