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/*
Copyright 2022-2023 Gabriel Jensen.
This file is part of agbsum.
agbsum is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
agbsum 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with agbsum. If not, see <https://www.gnu.org/licenses/>.
*/
#include <agbsum.h>
#include <stdint.h>
uint8_t
agb_getsum (void const* const restrict romptr)
{
uint8_t const* restrict rom = romptr;
uint8_t sum = 0x0u;
for (char unsigned const* restrict pos = rom; pos != rom + agb_sumoff; ++pos) {sum += *pos;}
sum = 0x0u - (0x19u + sum);
return sum;
}
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