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rand.c
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rand.c
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/*++
toro C Library
https://github.com/KilianKegel/toro-C-Library#toro-c-library-formerly-known-as-torito-c-library
Copyright (c) 2017-2024, Kilian Kegel. All rights reserved.
SPDX-License-Identifier: GNU General Public License v3.0
Module Name:
rand.c
Abstract:
Implementation of the Standard C function.
Generates a pseudorandom number.
Author:
Kilian Kegel
--*/
#include <CdeServices.h>
#include <stdlib.h>
/**
Synopsis
#include <stdlib.h>
int rand(void);
Description
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/rand?view=msvc-160&viewFallbackFrom=vs-2019
The rand function computes a sequence of pseudo-random integers in the range 0 to
RAND_MAX.
The implementation shall behave as if no library function calls the rand function.
Returns
The rand function returns a pseudo-random integer.
Environmental limits
The value of the RAND_MAX macro shall be at least 32767.
@param[in] void
@retval randomized int
**/
int rand(void) {
CDE_APP_IF* pCdeAppIf = __cdeGetAppIf();
unsigned* pnext = (unsigned*)&pCdeAppIf->nNextRandStaticInternal;
return RAND_MAX & ((*pnext = *pnext * 214013 + 2531011) >> 16);
}