65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The Sortix C Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
string/memset.c
|
|
Initializes a region of memory to a byte value.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include <__/wordsize.h>
|
|
|
|
void* memset(void* dest_ptr, int value, size_t length)
|
|
{
|
|
unsigned char* dest = (unsigned char*) dest_ptr;
|
|
#if __WORDSIZE == 32 || __WORDSIZE == 64
|
|
if ( ((uintptr_t) dest_ptr & (sizeof(unsigned long) - 1)) == 0 )
|
|
{
|
|
unsigned long* ulong_dest = (unsigned long*) dest;
|
|
size_t ulong_length = length / sizeof(unsigned long);
|
|
#if __WORDSIZE == 32
|
|
unsigned long ulong_value =
|
|
(unsigned long) ((unsigned char) value) << 0 |
|
|
(unsigned long) ((unsigned char) value) << 8 |
|
|
(unsigned long) ((unsigned char) value) << 16 |
|
|
(unsigned long) ((unsigned char) value) << 24;
|
|
#elif __WORDSIZE == 64
|
|
unsigned long ulong_value =
|
|
(unsigned long) ((unsigned char) value) << 0 |
|
|
(unsigned long) ((unsigned char) value) << 8 |
|
|
(unsigned long) ((unsigned char) value) << 16 |
|
|
(unsigned long) ((unsigned char) value) << 24 |
|
|
(unsigned long) ((unsigned char) value) << 32 |
|
|
(unsigned long) ((unsigned char) value) << 40 |
|
|
(unsigned long) ((unsigned char) value) << 48 |
|
|
(unsigned long) ((unsigned char) value) << 56;
|
|
#endif
|
|
for ( size_t i = 0; i < ulong_length; i++ )
|
|
ulong_dest[i] = ulong_value;
|
|
dest += ulong_length * sizeof(unsigned long);
|
|
length -= ulong_length * sizeof(unsigned long);
|
|
}
|
|
#endif
|
|
for ( size_t i = 0; i < length; i++ )
|
|
dest[i] = (unsigned char) value;
|
|
return dest_ptr;
|
|
}
|