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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. |
6d7e8eda | 3 | Copyright (C) 1991-2023 Free Software Foundation, Inc. |
ebbad4cc | 4 | This file is part of the GNU C Library. |
28f540f4 | 5 | |
ebbad4cc | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 10 | |
ebbad4cc UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
28f540f4 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 19 | |
28f540f4 RM |
20 | #include <string.h> |
21 | #include <memcopy.h> | |
22 | ||
3c05dd79 WD |
23 | #ifndef MEMCPY |
24 | # define MEMCPY memcpy | |
25 | #endif | |
92f1da4d | 26 | |
ebbad4cc | 27 | void * |
3c05dd79 | 28 | MEMCPY (void *dstpp, const void *srcpp, size_t len) |
28f540f4 RM |
29 | { |
30 | unsigned long int dstp = (long int) dstpp; | |
31 | unsigned long int srcp = (long int) srcpp; | |
32 | ||
33 | /* Copy from the beginning to the end. */ | |
34 | ||
35 | /* If there not too few bytes to copy, use word copy. */ | |
36 | if (len >= OP_T_THRES) | |
37 | { | |
38 | /* Copy just a few bytes to make DSTP aligned. */ | |
39 | len -= (-dstp) % OPSIZ; | |
40 | BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ); | |
41 | ||
67a87b93 RM |
42 | /* Copy whole pages from SRCP to DSTP by virtual address manipulation, |
43 | as much as possible. */ | |
44 | ||
45 | PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len); | |
46 | ||
47 | /* Copy from SRCP to DSTP taking advantage of the known alignment of | |
48 | DSTP. Number of bytes remaining is put in the third argument, | |
49 | i.e. in LEN. This number may vary from machine to machine. */ | |
28f540f4 RM |
50 | |
51 | WORD_COPY_FWD (dstp, srcp, len, len); | |
52 | ||
53 | /* Fall out and copy the tail. */ | |
54 | } | |
55 | ||
56 | /* There are just a few bytes to copy. Use byte memory operations. */ | |
57 | BYTE_COPY_FWD (dstp, srcp, len); | |
58 | ||
59 | return dstpp; | |
60 | } | |
3c05dd79 | 61 | libc_hidden_builtin_def (MEMCPY) |