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28f540f4 RM |
1 | /* Copyright (C) 1991 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 Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | #include <ansidecl.h> | |
20 | #include <string.h> | |
21 | #include <memcopy.h> | |
22 | ||
23 | PTR | |
24 | DEFUN(memset, (dstpp, c, len), PTR dstpp AND int c AND size_t len) | |
25 | { | |
26 | long int dstp = (long int) dstpp; | |
27 | ||
28 | if (len >= 8) | |
29 | { | |
30 | size_t xlen; | |
31 | op_t cccc; | |
32 | ||
33 | cccc = (unsigned char) c; | |
34 | cccc |= cccc << 8; | |
35 | cccc |= cccc << 16; | |
36 | if (OPSIZ > 4) | |
37 | cccc |= cccc << 32; | |
38 | ||
39 | /* There are at least some bytes to set. | |
40 | No need to test for LEN == 0 in this alignment loop. */ | |
41 | while (dstp % OPSIZ != 0) | |
42 | { | |
43 | ((byte *) dstp)[0] = c; | |
44 | dstp += 1; | |
45 | len -= 1; | |
46 | } | |
47 | ||
48 | /* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */ | |
49 | xlen = len / (OPSIZ * 8); | |
50 | while (xlen > 0) | |
51 | { | |
52 | ((op_t *) dstp)[0] = cccc; | |
53 | ((op_t *) dstp)[1] = cccc; | |
54 | ((op_t *) dstp)[2] = cccc; | |
55 | ((op_t *) dstp)[3] = cccc; | |
56 | ((op_t *) dstp)[4] = cccc; | |
57 | ((op_t *) dstp)[5] = cccc; | |
58 | ((op_t *) dstp)[6] = cccc; | |
59 | ((op_t *) dstp)[7] = cccc; | |
60 | dstp += 8 * OPSIZ; | |
61 | xlen -= 1; | |
62 | } | |
63 | len %= OPSIZ * 8; | |
64 | ||
65 | /* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */ | |
66 | xlen = len / OPSIZ; | |
67 | while (xlen > 0) | |
68 | { | |
69 | ((op_t *) dstp)[0] = cccc; | |
70 | dstp += OPSIZ; | |
71 | xlen -= 1; | |
72 | } | |
73 | len %= OPSIZ; | |
74 | } | |
75 | ||
76 | /* Write the last few bytes. */ | |
77 | while (len > 0) | |
78 | { | |
79 | ((byte *) dstp)[0] = c; | |
80 | dstp += 1; | |
81 | len -= 1; | |
82 | } | |
83 | ||
84 | return dstpp; | |
85 | } |