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68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/* This file is part of the KDE libraries
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Copyright (c) 1999 Matthias Kalle Dalheimer <kalle@kde.org>
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Copyright (c) 2000 Charles Samuels <charles@kde.org>
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Copyright (c) 2005 Joseph Wenninger <kde@jowenn.at>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "krandom.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <time.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <kde_file.h>
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int KRandom::random()
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{
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static bool init = false;
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if (!init)
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{
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unsigned int seed;
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init = true;
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int fd = KDE_open("/dev/urandom", O_RDONLY);
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if (fd < 0 || ::read(fd, &seed, sizeof(seed)) != sizeof(seed))
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{
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// No /dev/urandom... try something else.
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srand(getpid());
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seed = rand()+time(0);
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}
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if (fd >= 0) close(fd);
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srand(seed);
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}
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return rand();
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}
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QString KRandom::randomString(int length)
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{
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if (length <=0 ) return QString();
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QString str; str.resize( length );
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int i = 0;
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while (length--)
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{
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int r=random() % 62;
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r+=48;
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if (r>57) r+=7;
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if (r>90) r+=6;
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str[i++] = char(r);
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// so what if I work backwards?
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}
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return str;
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}
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