2bcb713371
This commit globally defines the `Z_LIBC_DATA` macro, which is used to place variables into the libc memory partition, so that it can be re-used. Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
33 lines
605 B
C
33 lines
605 B
C
/*
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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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