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42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
/* Swap the content of two memory blocks, overlap is NOT handled.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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static inline void
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__memswap (void *__restrict p1, void *__restrict p2, size_t n)
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{
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/* Use multiple small memcpys with constant size to enable inlining on most
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targets. */
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enum { SWAP_GENERIC_SIZE = 32 };
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unsigned char tmp[SWAP_GENERIC_SIZE];
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while (n > SWAP_GENERIC_SIZE)
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{
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memcpy (tmp, p1, SWAP_GENERIC_SIZE);
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p1 = __mempcpy (p1, p2, SWAP_GENERIC_SIZE);
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p2 = __mempcpy (p2, tmp, SWAP_GENERIC_SIZE);
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n -= SWAP_GENERIC_SIZE;
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}
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while (n > 0)
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{
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unsigned char t = ((unsigned char *)p1)[--n];
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((unsigned char *)p1)[n] = ((unsigned char *)p2)[n];
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((unsigned char *)p2)[n] = t;
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}
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}
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