52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* Copyright (C) 2022 Camden Dixie O'Brien
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this program. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "sud.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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static uint32_t getseed(void)
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{
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FILE *urandom = fopen("/dev/urandom", "rb");
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if (urandom == NULL)
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fprintf(stderr, "Failed to open /dev/urandom\n");
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uint32_t seed = 0;
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for (unsigned i = 0; i < 4; ++i)
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seed = seed << 8 | fgetc(urandom);
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fclose(urandom);
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return seed;
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}
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int main(void)
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{
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uint32_t seed = getseed();
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printf("Seed: %u\n\n", seed);
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srand(seed);
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struct sudoku sud;
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gen(&sud);
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print(&sud);
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return 0;
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}
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