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https://git.sr.ht/~cismonx/bookmarkfs
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ffa28a4091
Tests that require PRNG are by default seeded from `/dev/urandom`. However, the user should be able to override with a given seed to reproduce a failing test. Instead of messing with command-line arguments, a cleaner approach is to fetch the seed from an environment variable.
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/**
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* bookmarkfs/tests/check_util.c
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* ----
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*
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* Copyright (C) 2025 CismonX <admin@cismon.net>
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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 General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "check_util.h"
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "prng.h"
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int
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prng_seed_from_env (void)
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{
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char const *seed_str = getenv("BOOKMARKFS_TEST_PRNG_SEED");
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if (seed_str == NULL) {
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return prng_seed(NULL);
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}
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uint64_t seed[4];
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int cnt = sscanf(seed_str,
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"%16" SCNx64 "%16" SCNx64 "%16" SCNx64 "%16" SCNx64,
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&seed[0], &seed[1], &seed[2], &seed[3]);
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if (cnt != 4) {
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log_puts("bad prng seed");
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return -1;
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}
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return prng_seed(seed);
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}
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