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ebbad4cc | 1 | /* Copy memory to memory until the specified number of bytes |
28f540f4 | 2 | has been copied. Overlap is NOT handled correctly. |
04277e02 | 3 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
ebbad4cc | 4 | This file is part of the GNU C Library. |
28f540f4 RM |
5 | Contributed by Torbjorn Granlund (tege@sics.se). |
6 | ||
ebbad4cc | 7 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 11 | |
ebbad4cc UD |
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 | |
41bdb6e2 | 15 | Lesser General Public License for more details. |
28f540f4 | 16 | |
41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 20 | |
28f540f4 RM |
21 | #include <string.h> |
22 | #include <memcopy.h> | |
23 | ||
92f1da4d UD |
24 | #undef memcpy |
25 | ||
ebbad4cc | 26 | void * |
9d46370c | 27 | memcpy (void *dstpp, const void *srcpp, size_t len) |
28f540f4 RM |
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 | ||
67a87b93 RM |
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. */ | |
28f540f4 RM |
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 | } | |
85dd1003 | 60 | libc_hidden_builtin_def (memcpy) |