60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
/*
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* Copyright (c) 2011, 2012, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* string/memset.c
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* Initializes a region of memory to a byte value.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <__/wordsize.h>
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void* memset(void* dest_ptr, int value, size_t length)
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{
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unsigned char* dest = (unsigned char*) dest_ptr;
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#if __WORDSIZE == 32 || __WORDSIZE == 64
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if ( ((uintptr_t) dest_ptr & (sizeof(unsigned long) - 1)) == 0 )
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{
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unsigned long* ulong_dest = (unsigned long*) dest;
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size_t ulong_length = length / sizeof(unsigned long);
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#if __WORDSIZE == 32
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unsigned long ulong_value =
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(unsigned long) ((unsigned char) value) << 0 |
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(unsigned long) ((unsigned char) value) << 8 |
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(unsigned long) ((unsigned char) value) << 16 |
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(unsigned long) ((unsigned char) value) << 24;
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#elif __WORDSIZE == 64
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unsigned long ulong_value =
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(unsigned long) ((unsigned char) value) << 0 |
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(unsigned long) ((unsigned char) value) << 8 |
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(unsigned long) ((unsigned char) value) << 16 |
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(unsigned long) ((unsigned char) value) << 24 |
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(unsigned long) ((unsigned char) value) << 32 |
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(unsigned long) ((unsigned char) value) << 40 |
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(unsigned long) ((unsigned char) value) << 48 |
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(unsigned long) ((unsigned char) value) << 56;
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#endif
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for ( size_t i = 0; i < ulong_length; i++ )
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ulong_dest[i] = ulong_value;
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dest += ulong_length * sizeof(unsigned long);
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length -= ulong_length * sizeof(unsigned long);
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}
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#endif
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for ( size_t i = 0; i < length; i++ )
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dest[i] = (unsigned char) value;
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return dest_ptr;
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}
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