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74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
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#include <precomp.h>
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#include <ntsecapi.h>
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#include <internal/tls.h>
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/*
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* @implemented
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*/
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int
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rand(void)
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{
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thread_data_t *data = msvcrt_get_thread_data();
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/* this is the algorithm used by MSVC, according to
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* http://en.wikipedia.org/wiki/List_of_pseudorandom_number_generators */
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data->random_seed = data->random_seed * 214013 + 2531011;
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return (data->random_seed >> 16) & RAND_MAX;
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}
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/*
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* @implemented
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*/
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void
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srand(unsigned int seed)
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{
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thread_data_t *data = msvcrt_get_thread_data();
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data->random_seed = seed;
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}
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/*********************************************************************
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* rand_s (MSVCRT.@)
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*/
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int CDECL rand_s(unsigned int *pval)
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{
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BOOLEAN (WINAPI *pSystemFunction036)(PVOID, ULONG); // RtlGenRandom
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HINSTANCE hadvapi32;
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if (!pval)
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{
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_invalid_parameter(NULL,_CRT_WIDE("rand_s"),_CRT_WIDE(__FILE__),__LINE__, 0);
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*_errno() = EINVAL;
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return EINVAL;
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}
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*pval = 0;
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hadvapi32 = LoadLibraryA("advapi32.dll");
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if (!hadvapi32)
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{
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_invalid_parameter(NULL,_CRT_WIDE("rand_s"),_CRT_WIDE(__FILE__),__LINE__, 0);
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*_errno() = EINVAL;
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return EINVAL;
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}
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pSystemFunction036 = (void*)GetProcAddress(hadvapi32, "SystemFunction036");
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if (!pSystemFunction036)
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{
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_invalid_parameter(NULL,_CRT_WIDE("rand_s"),_CRT_WIDE(__FILE__),__LINE__, 0);
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*_errno() = EINVAL;
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FreeLibrary(hadvapi32);
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return EINVAL;
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}
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if (!pSystemFunction036(pval, sizeof(*pval)))
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{
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_invalid_parameter(NULL,_CRT_WIDE("rand_s"),_CRT_WIDE(__FILE__),__LINE__, 0);
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*_errno() = EINVAL;
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FreeLibrary(hadvapi32);
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return EINVAL;
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}
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FreeLibrary(hadvapi32);
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return 0;
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}
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