1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
22 ***************************************************************************/
26 #include <curl/curl.h>
28 #include "curl_rand.h"
30 #define _MPRINTF_REPLACE /* use our functions only */
31 #include <curl/mprintf.h>
33 #include "curl_memory.h"
34 /* The last #include file should be: */
37 /* Private pseudo-random number seed. Unsigned integer >= 32bit. Threads
38 mutual exclusion is not implemented to acess it since we do not require
39 high quality random numbers (only used in form boudary generation). */
41 static unsigned int randseed;
43 /* Pseudo-random number support. */
45 unsigned int Curl_rand(void)
48 /* Return an unsigned 32-bit pseudo-random number. */
49 r = randseed = randseed * 1103515245 + 12345;
50 return (r << 16) | ((r >> 16) & 0xFFFF);
55 /* Randomize pseudo-random number sequence. */
57 randseed = (unsigned int) time(NULL);