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64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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string/memset.cpp
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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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extern "C" 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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