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krandom.cpp
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1/* This file is part of the KDE libraries
2 Copyright (c) 1999 Matthias Kalle Dalheimer <kalle@kde.org>
3 Copyright (c) 2000 Charles Samuels <charles@kde.org>
4 Copyright (c) 2005 Joseph Wenninger <kde@jowenn.at>
5
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public License
17 along with this library; see the file COPYING.LIB. If not, write to
18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA.
20 */
21
22#include "krandom.h"
23
24#include <stdlib.h>
25#include <unistd.h>
26#include <stdio.h>
27#include <time.h>
28#include <sys/time.h>
29#include <fcntl.h>
30#include <kde_file.h>
31
32int KRandom::random()
33{
34 static bool init = false;
35 if (!init)
36 {
37 unsigned int seed;
38 init = true;
39 int fd = KDE_open("/dev/urandom", O_RDONLY);
40 if (fd < 0 || ::read(fd, &seed, sizeof(seed)) != sizeof(seed))
41 {
42 // No /dev/urandom... try something else.
43 srand(getpid());
44 seed = rand()+time(0);
45 }
46 if (fd >= 0) close(fd);
47 srand(seed);
48 }
49 return rand();
50}
51
52QString KRandom::randomString(int length)
53{
54 if (length <=0 ) return QString();
55
56 QString str; str.resize( length );
57 int i = 0;
58 while (length--)
59 {
60 int r=random() % 62;
61 r+=48;
62 if (r>57) r+=7;
63 if (r>90) r+=6;
64 str[i++] = char(r);
65 // so what if I work backwards?
66 }
67 return str;
68}
QString
krandom.h
KRandom::random
int random()
Generates a uniform random number.
Definition: krandom.cpp:32
KRandom::randomString
QString randomString(int length)
Generates a random string.
Definition: krandom.cpp:52
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