51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define _DEFAULT_SOURCE
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#include "os.h"
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#if defined(_TD_WINDOWS_64) || defined(_TD_WINDOWS_32)
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#else
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#include <sys/file.h>
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#include <unistd.h>
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#endif
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uint32_t taosRand(void) { return rand(); }
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uint32_t taosSafeRand(void) {
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TdFilePtr pFile;
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int seed;
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pFile = taosOpenFile("/dev/urandom", TD_FILE_READ);
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if (pFile == NULL) {
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seed = (int)time(0);
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} else {
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int len = taosReadFile(pFile, &seed, sizeof(seed));
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if (len < 0) {
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seed = (int)time(0);
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}
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taosCloseFile(&pFile);
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}
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return (uint32_t)seed;
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}
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void taosRandStr(char* str, int32_t size) {
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const char* set = "abcdefghijklmnopqrstuvwxyz0123456789-_.";
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int32_t len = 39;
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for (int32_t i = 0; i < size; ++i) {
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str[i] = set[taosRand() % len];
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}
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} |