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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file rand32.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "rand32"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_int_t xm_hash_rand32(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
static tb_uint64_t s_seed = 0;
if (!s_seed) {
s_seed = (tb_uint64_t)tb_uclock();
}
s_seed = xm_hash_xorshift64(s_seed);
tb_char_t s[256];
tb_uint32_t word = (s_seed >> 32) ^ (s_seed & 0xffffffff);
tb_size_t n = xm_hash_make_cstr(s, (tb_byte_t const *)&word, 4);
lua_pushlstring(lua, s, n);
return 1;
}
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