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/arch/parisc/lib/memset.c

https://github.com/aicjofs/android_kernel_lge_v500_20d
C | 91 lines | 56 code | 11 blank | 24 comment | 7 complexity | e8068eac81722e0f7ba8086f37b22f1e MD5 | raw file
 1/* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
 2   This file is part of the GNU C Library.
 3
 4   The GNU C Library is free software; you can redistribute it and/or
 5   modify it under the terms of the GNU Lesser General Public
 6   License as published by the Free Software Foundation; either
 7   version 2.1 of the License, or (at your option) any later version.
 8
 9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, write to the Free
16   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17   02111-1307 USA.  */
18
19/* Slight modifications for pa-risc linux - Paul Bame <bame@debian.org> */
20
21#include <linux/types.h>
22#include <asm/string.h>
23
24#define OPSIZ (BITS_PER_LONG/8)
25typedef unsigned long op_t;
26
27void *
28memset (void *dstpp, int sc, size_t len)
29{
30  unsigned int c = sc;
31  long int dstp = (long int) dstpp;
32
33  if (len >= 8)
34    {
35      size_t xlen;
36      op_t cccc;
37
38      cccc = (unsigned char) c;
39      cccc |= cccc << 8;
40      cccc |= cccc << 16;
41      if (OPSIZ > 4)
42	/* Do the shift in two steps to avoid warning if long has 32 bits.  */
43	cccc |= (cccc << 16) << 16;
44
45      /* There are at least some bytes to set.
46	 No need to test for LEN == 0 in this alignment loop.  */
47      while (dstp % OPSIZ != 0)
48	{
49	  ((unsigned char *) dstp)[0] = c;
50	  dstp += 1;
51	  len -= 1;
52	}
53
54      /* Write 8 `op_t' per iteration until less than 8 `op_t' remain.  */
55      xlen = len / (OPSIZ * 8);
56      while (xlen > 0)
57	{
58	  ((op_t *) dstp)[0] = cccc;
59	  ((op_t *) dstp)[1] = cccc;
60	  ((op_t *) dstp)[2] = cccc;
61	  ((op_t *) dstp)[3] = cccc;
62	  ((op_t *) dstp)[4] = cccc;
63	  ((op_t *) dstp)[5] = cccc;
64	  ((op_t *) dstp)[6] = cccc;
65	  ((op_t *) dstp)[7] = cccc;
66	  dstp += 8 * OPSIZ;
67	  xlen -= 1;
68	}
69      len %= OPSIZ * 8;
70
71      /* Write 1 `op_t' per iteration until less than OPSIZ bytes remain.  */
72      xlen = len / OPSIZ;
73      while (xlen > 0)
74	{
75	  ((op_t *) dstp)[0] = cccc;
76	  dstp += OPSIZ;
77	  xlen -= 1;
78	}
79      len %= OPSIZ;
80    }
81
82  /* Write the last few bytes.  */
83  while (len > 0)
84    {
85      ((unsigned char *) dstp)[0] = c;
86      dstp += 1;
87      len -= 1;
88    }
89
90  return dstpp;
91}