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b5cc329c UD |
1 | /* Copy memory to memory until the specified number of bytes |
2 | has been copied with error checking. Overlap is NOT handled correctly. | |
568035b7 | 3 | Copyright (C) 1991-2013 Free Software Foundation, Inc. |
b5cc329c UD |
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 | |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
b5cc329c UD |
20 | |
21 | #include <string.h> | |
22 | #include <memcopy.h> | |
23 | #include <pagecopy.h> | |
24 | ||
25 | void * | |
26 | __memcpy_chk (dstpp, srcpp, len, dstlen) | |
27 | void *dstpp; | |
28 | const void *srcpp; | |
29 | size_t len; | |
30 | size_t dstlen; | |
31 | { | |
32 | if (__builtin_expect (dstlen < len, 0)) | |
33 | __chk_fail (); | |
34 | ||
35 | unsigned long int dstp = (long int) dstpp; | |
36 | unsigned long int srcp = (long int) srcpp; | |
37 | ||
38 | /* Copy from the beginning to the end. */ | |
39 | ||
40 | /* If there not too few bytes to copy, use word copy. */ | |
41 | if (len >= OP_T_THRES) | |
42 | { | |
43 | /* Copy just a few bytes to make DSTP aligned. */ | |
44 | len -= (-dstp) % OPSIZ; | |
45 | BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ); | |
46 | ||
47 | /* Copy whole pages from SRCP to DSTP by virtual address manipulation, | |
48 | as much as possible. */ | |
49 | ||
50 | PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len); | |
51 | ||
52 | /* Copy from SRCP to DSTP taking advantage of the known alignment of | |
53 | DSTP. Number of bytes remaining is put in the third argument, | |
54 | i.e. in LEN. This number may vary from machine to machine. */ | |
55 | ||
56 | WORD_COPY_FWD (dstp, srcp, len, len); | |
57 | ||
58 | /* Fall out and copy the tail. */ | |
59 | } | |
60 | ||
61 | /* There are just a few bytes to copy. Use byte memory operations. */ | |
62 | BYTE_COPY_FWD (dstp, srcp, len); | |
63 | ||
64 | return dstpp; | |
65 | } |