Warning: That file was not part of the compilation database. It may have many parsing errors.
1 | /* Copy memory to memory until the specified number of bytes |
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2 | has been copied. Overlap is NOT handled correctly. |
3 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
4 | This file is part of the GNU C Library. |
5 | Contributed by Torbjorn Granlund (tege@sics.se). |
6 | |
7 | The GNU C Library is free software; you can redistribute it and/or |
8 | modify it under the terms of the GNU Lesser General Public |
9 | License as published by the Free Software Foundation; either |
10 | version 2.1 of the License, or (at your option) any later version. |
11 | |
12 | The GNU C Library is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | Lesser General Public License for more details. |
16 | |
17 | You should have received a copy of the GNU Lesser General Public |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ |
20 | |
21 | #include <string.h> |
22 | #include <memcopy.h> |
23 | |
24 | #undef memcpy |
25 | |
26 | void * |
27 | memcpy (void *dstpp, const void *srcpp, size_t len) |
28 | { |
29 | unsigned long int dstp = (long int) dstpp; |
30 | unsigned long int srcp = (long int) srcpp; |
31 | |
32 | /* Copy from the beginning to the end. */ |
33 | |
34 | /* If there not too few bytes to copy, use word copy. */ |
35 | if (len >= OP_T_THRES) |
36 | { |
37 | /* Copy just a few bytes to make DSTP aligned. */ |
38 | len -= (-dstp) % OPSIZ; |
39 | BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ); |
40 | |
41 | /* Copy whole pages from SRCP to DSTP by virtual address manipulation, |
42 | as much as possible. */ |
43 | |
44 | PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len); |
45 | |
46 | /* Copy from SRCP to DSTP taking advantage of the known alignment of |
47 | DSTP. Number of bytes remaining is put in the third argument, |
48 | i.e. in LEN. This number may vary from machine to machine. */ |
49 | |
50 | WORD_COPY_FWD (dstp, srcp, len, len); |
51 | |
52 | /* Fall out and copy the tail. */ |
53 | } |
54 | |
55 | /* There are just a few bytes to copy. Use byte memory operations. */ |
56 | BYTE_COPY_FWD (dstp, srcp, len); |
57 | |
58 | return dstpp; |
59 | } |
60 | libc_hidden_builtin_def (memcpy) |
61 |
Warning: That file was not part of the compilation database. It may have many parsing errors.