62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
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/*
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** Copyright 2005, Michael Noisternig. All rights reserved.
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** Copyright 2001, Travis Geiselbrecht. All rights reserved.
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** Distributed under the terms of the NewOS License.
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*/
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include <sys/types.h>
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void *
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memset(void *s, int c, size_t count)
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{
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char *xs = (char *) s;
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size_t len = (-(size_t)s) & (sizeof(size_t)-1);
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int cc = c & 0xff;
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if ( count > len ) {
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count -= len;
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cc |= cc << 8;
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cc |= cc << 16;
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// write to non-aligned memory byte-wise
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for ( ; len > 0; len-- )
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*xs++ = c;
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// write to aligned memory dword-wise
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for ( len = count/sizeof(size_t); len > 0; len-- ) {
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*((size_t *)xs) = cc;
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xs += sizeof(size_t);
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}
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count &= sizeof(size_t)-1;
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}
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// write remaining bytes
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for ( ; count > 0; count-- )
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*xs++ = c;
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return s;
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}
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