1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at http://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23#include "setup.h" 24 25#include <curl/curl.h> 26 27#include "curl_rand.h" 28 29#define _MPRINTF_REPLACE /* use our functions only */ 30#include <curl/mprintf.h> 31 32#include "curl_memory.h" 33/* The last #include file should be: */ 34#include "memdebug.h" 35 36/* Private pseudo-random number seed. Unsigned integer >= 32bit. Threads 37 mutual exclusion is not implemented to acess it since we do not require 38 high quality random numbers (only used in form boudary generation). */ 39 40static unsigned int randseed; 41 42/* Pseudo-random number support. */ 43 44unsigned int Curl_rand(void) 45{ 46 unsigned int r; 47 /* Return an unsigned 32-bit pseudo-random number. */ 48 r = randseed = randseed * 1103515245 + 12345; 49 return (r << 16) | ((r >> 16) & 0xFFFF); 50} 51 52void Curl_srand(void) 53{ 54 /* Randomize pseudo-random number sequence. */ 55 56 randseed = (unsigned int) time(NULL); 57 Curl_rand(); 58 Curl_rand(); 59 Curl_rand(); 60} 61 62