projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ebbad4cc | 1 | /* Copy memory to memory until the specified number of bytes |
| 28f540f4 | 2 | has been copied. Overlap is NOT handled correctly. |
| d4697bc9 | 3 | Copyright (C) 1991-2014 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> | |
| 67a87b93 | 23 | #include <pagecopy.h> |
| 28f540f4 | 24 | |
| 92f1da4d UD |
25 | #undef memcpy |
| 26 | ||
| ebbad4cc UD |
27 | void * |
| 28 | memcpy (dstpp, srcpp, len) | |
| 29 | void *dstpp; | |
| 30 | const void *srcpp; | |
| 31 | size_t len; | |
| 28f540f4 RM |
32 | { |
| 33 | unsigned long int dstp = (long int) dstpp; | |
| 34 | unsigned long int srcp = (long int) srcpp; | |
| 35 | ||
| 36 | /* Copy from the beginning to the end. */ | |
| 37 | ||
| 38 | /* If there not too few bytes to copy, use word copy. */ | |
| 39 | if (len >= OP_T_THRES) | |
| 40 | { | |
| 41 | /* Copy just a few bytes to make DSTP aligned. */ | |
| 42 | len -= (-dstp) % OPSIZ; | |
| 43 | BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ); | |
| 44 | ||
| 67a87b93 RM |
45 | /* Copy whole pages from SRCP to DSTP by virtual address manipulation, |
| 46 | as much as possible. */ | |
| 47 | ||
| 48 | PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len); | |
| 49 | ||
| 50 | /* Copy from SRCP to DSTP taking advantage of the known alignment of | |
| 51 | DSTP. Number of bytes remaining is put in the third argument, | |
| 52 | i.e. in LEN. This number may vary from machine to machine. */ | |
| 28f540f4 RM |
53 | |
| 54 | WORD_COPY_FWD (dstp, srcp, len, len); | |
| 55 | ||
| 56 | /* Fall out and copy the tail. */ | |
| 57 | } | |
| 58 | ||
| 59 | /* There are just a few bytes to copy. Use byte memory operations. */ | |
| 60 | BYTE_COPY_FWD (dstp, srcp, len); | |
| 61 | ||
| 62 | return dstpp; | |
| 63 | } | |
| 85dd1003 | 64 | libc_hidden_builtin_def (memcpy) |