source: trunk/sys/dietlibc/memset.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/*
2   This file is part of MutekP.
3 
4   MutekP is free software; you can redistribute it and/or modify it
5   under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2 of the License, or
7   (at your option) any later version.
8 
9   MutekP is distributed in the hope that it will be useful, but
10   WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   General Public License for more details.
13 
14   You should have received a copy of the GNU General Public License
15   along with MutekP; if not, write to the Free Software Foundation,
16   Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 
18   UPMC / LIP6 / SOC (c) 2008
19   Copyright Ghassan Almaless <ghassan.almaless@gmail.com>
20*/
21
22#include <string.h>
23
24void *memset (void *s, int c, unsigned int size)
25{
26  register char *ptr = s;
27  register unsigned int *iptr;
28  register unsigned int val;
29  register unsigned int isize;
30  register unsigned int iamount;
31
32  while(((uint32_t) ptr & 0x3) && size && size--)
33    *(ptr++) = (char) c;
34
35  if(!size) return s;
36
37  val = c << 24 | c << 16 | c << 8 | (c & 0xFF); 
38  isize = size >> 2;
39  iamount = isize << 2;
40  iptr = (unsigned int*) ptr;
41 
42  while(isize--)
43    *(iptr++) = val;
44 
45  size = size - iamount;
46  ptr = (char*) iptr;
47 
48  while(size--)
49    *(ptr++) = (char) c;
50
51  return s;
52}
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