67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Standard random generator is slow. For FS testing we need just some
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garbage files, we don't need them to be high-quality random.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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static unsigned long long buffer[1048576];
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int
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main (int argc, char **argv)
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{
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unsigned long long high = 0, low = 1;
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unsigned long i, j;
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unsigned long long cnt = strtoull (argv[1], 0, 0);
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struct timeval tv;
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gettimeofday (&tv, NULL);
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high = tv.tv_sec;
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low = tv.tv_usec;
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if (!high)
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high = 1;
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if (!low)
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low = 2;
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for (j = 0; j < (cnt + sizeof (buffer) - 1) / sizeof (buffer); j++)
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{
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for (i = 0; i < sizeof (buffer) / sizeof (buffer[0]); i += 2)
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{
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int c1 = 0, c2 = 0;
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buffer[i] = low;
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buffer[i+1] = high;
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if (low & (1ULL << 63))
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c1 = 1;
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low <<= 1;
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if (high & (1ULL << 63))
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c2 = 1;
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high = (high << 1) | c1;
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if (c2)
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low ^= 0x87;
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}
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if (sizeof (buffer) < cnt - sizeof (buffer) * j)
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fwrite (buffer, 1, sizeof (buffer), stdout);
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else
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fwrite (buffer, 1, cnt - sizeof (buffer) * j, stdout);
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}
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return 0;
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}
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