diff options
Diffstat (limited to '')
| -rw-r--r-- | src/lib/libc/string/bcopy.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/src/lib/libc/string/bcopy.c b/src/lib/libc/string/bcopy.c deleted file mode 100644 index ef0d368053..0000000000 --- a/src/lib/libc/string/bcopy.c +++ /dev/null | |||
| @@ -1,113 +0,0 @@ | |||
| 1 | /* $OpenBSD: bcopy.c,v 1.7 2015/08/31 02:53:57 guenther Exp $ */ | ||
| 2 | /*- | ||
| 3 | * Copyright (c) 1990 The Regents of the University of California. | ||
| 4 | * All rights reserved. | ||
| 5 | * | ||
| 6 | * This code is derived from software contributed to Berkeley by | ||
| 7 | * Chris Torek. | ||
| 8 | * | ||
| 9 | * Redistribution and use in source and binary forms, with or without | ||
| 10 | * modification, are permitted provided that the following conditions | ||
| 11 | * are met: | ||
| 12 | * 1. Redistributions of source code must retain the above copyright | ||
| 13 | * notice, this list of conditions and the following disclaimer. | ||
| 14 | * 2. Redistributions in binary form must reproduce the above copyright | ||
| 15 | * notice, this list of conditions and the following disclaimer in the | ||
| 16 | * documentation and/or other materials provided with the distribution. | ||
| 17 | * 3. Neither the name of the University nor the names of its contributors | ||
| 18 | * may be used to endorse or promote products derived from this software | ||
| 19 | * without specific prior written permission. | ||
| 20 | * | ||
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
| 31 | * SUCH DAMAGE. | ||
| 32 | */ | ||
| 33 | |||
| 34 | #include <string.h> | ||
| 35 | |||
| 36 | /* | ||
| 37 | * sizeof(word) MUST BE A POWER OF TWO | ||
| 38 | * SO THAT wmask BELOW IS ALL ONES | ||
| 39 | */ | ||
| 40 | typedef long word; /* "word" used for optimal copy speed */ | ||
| 41 | |||
| 42 | #define wsize sizeof(word) | ||
| 43 | #define wmask (wsize - 1) | ||
| 44 | |||
| 45 | /* | ||
| 46 | * Copy a block of memory, handling overlap. | ||
| 47 | */ | ||
| 48 | void | ||
| 49 | bcopy(const void *src0, void *dst0, size_t length) | ||
| 50 | { | ||
| 51 | char *dst = dst0; | ||
| 52 | const char *src = src0; | ||
| 53 | size_t t; | ||
| 54 | |||
| 55 | if (length == 0 || dst == src) /* nothing to do */ | ||
| 56 | goto done; | ||
| 57 | |||
| 58 | /* | ||
| 59 | * Macros: loop-t-times; and loop-t-times, t>0 | ||
| 60 | */ | ||
| 61 | #define TLOOP(s) if (t) TLOOP1(s) | ||
| 62 | #define TLOOP1(s) do { s; } while (--t) | ||
| 63 | |||
| 64 | if ((unsigned long)dst < (unsigned long)src) { | ||
| 65 | /* | ||
| 66 | * Copy forward. | ||
| 67 | */ | ||
| 68 | t = (long)src; /* only need low bits */ | ||
| 69 | if ((t | (long)dst) & wmask) { | ||
| 70 | /* | ||
| 71 | * Try to align operands. This cannot be done | ||
| 72 | * unless the low bits match. | ||
| 73 | */ | ||
| 74 | if ((t ^ (long)dst) & wmask || length < wsize) | ||
| 75 | t = length; | ||
| 76 | else | ||
| 77 | t = wsize - (t & wmask); | ||
| 78 | length -= t; | ||
| 79 | TLOOP1(*dst++ = *src++); | ||
| 80 | } | ||
| 81 | /* | ||
| 82 | * Copy whole words, then mop up any trailing bytes. | ||
| 83 | */ | ||
| 84 | t = length / wsize; | ||
| 85 | TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize); | ||
| 86 | t = length & wmask; | ||
| 87 | TLOOP(*dst++ = *src++); | ||
| 88 | } else { | ||
| 89 | /* | ||
| 90 | * Copy backwards. Otherwise essentially the same. | ||
| 91 | * Alignment works as before, except that it takes | ||
| 92 | * (t&wmask) bytes to align, not wsize-(t&wmask). | ||
| 93 | */ | ||
| 94 | src += length; | ||
| 95 | dst += length; | ||
| 96 | t = (long)src; | ||
| 97 | if ((t | (long)dst) & wmask) { | ||
| 98 | if ((t ^ (long)dst) & wmask || length <= wsize) | ||
| 99 | t = length; | ||
| 100 | else | ||
| 101 | t &= wmask; | ||
| 102 | length -= t; | ||
| 103 | TLOOP1(*--dst = *--src); | ||
| 104 | } | ||
| 105 | t = length / wsize; | ||
| 106 | TLOOP(src -= wsize; dst -= wsize; *(word *)dst = *(word *)src); | ||
| 107 | t = length & wmask; | ||
| 108 | TLOOP(*--dst = *--src); | ||
| 109 | } | ||
| 110 | done: | ||
| 111 | return; | ||
| 112 | } | ||
| 113 | DEF_WEAK(bcopy); | ||