61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* 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 (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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void
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qswap (void *a, void *b, size_t size)
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{
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char *buf[8];
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memcpy (buf, a, size);
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memcpy (a, b, size);
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memcpy (b, buf, size);
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}
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size_t
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qpart (void *base, size_t count, size_t size, int (*compare)(void const *, void const *))
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{
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void* p = base + count*size;
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size_t i = 0;
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for (size_t j = 0; j < count; j++)
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{
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if (compare (base+j*size, p) < 0)
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{
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qswap (base+i*size, base+j*size, size);
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i++;
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}
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}
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if (compare (base+count*size, base+i*size) < 0)
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qswap (base+i*size, base+count*size, size);
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return i;
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}
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void
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qsort (void *base, size_t count, size_t size, int (*compare)(void const *, void const *))
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{
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if (count > 1)
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{
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int p = qpart (base, count-1, size, compare);
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qsort (base, p, size, compare);
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qsort (base+p*size, count-p, size, compare);
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}
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}
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