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33 lines
605 B
33 lines
605 B
/* |
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* Copyright (c) 2021 Space Cubics, LLC. |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#include <stdlib.h> |
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#include <zephyr/sys/libc-hooks.h> |
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#define OUTPUT_BITS (0x7fffffffU) |
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#define MULTIPLIER (1103515245U) |
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#define INCREMENT (12345U) |
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int rand_r(unsigned int *seed) |
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{ |
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*seed = (MULTIPLIER * *seed + INCREMENT) & OUTPUT_BITS; |
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return *seed; |
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} |
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#ifdef CONFIG_MINIMAL_LIBC_NON_REENTRANT_FUNCTIONS |
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static Z_LIBC_DATA unsigned int srand_seed = 1; |
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void srand(unsigned int s) |
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{ |
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srand_seed = s; |
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} |
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int rand(void) |
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{ |
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return rand_r(&srand_seed); |
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} |
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#endif /* CONFIG_MINIMAL_LIBC_NON_REENTRANT_FUNCTIONS */
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