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.
21 ***************************************************************************/
25 #include <curl/curl.h>
27 #include "curl_rand.h"
29 #define _MPRINTF_REPLACE /* use our functions only */
30 #include <curl/mprintf.h>
32 #include "curl_memory.h"
33 /* The last #include file should be: */
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). */
40 static unsigned int randseed;
42 /* Pseudo-random number support. */
44 unsigned int Curl_rand(void)
47 /* Return an unsigned 32-bit pseudo-random number. */
48 r = randseed = randseed * 1103515245 + 12345;
49 return (r << 16) | ((r >> 16) & 0xFFFF);
54 /* Randomize pseudo-random number sequence. */
56 randseed = (unsigned int) time(NULL);