projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 1f0ad314 WJ |
1 | /*- |
| 2 | * Copyright (c) 1988 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. 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 | * @(#)vaxbsubs.s 4.2 (Berkeley) 4/26/91 | |
| 34 | */ | |
| 35 | ||
| 36 | /* This is taken from bcmp.s from 4.2. | |
| 37 | * The output of bunequal is the offset of the byte which didn't match; | |
| 38 | * if all the bytes match, then we return n. | |
| 39 | * | |
| 40 | * BUGNOTE: This has no chance of working for lengths greater than 64K. | |
| 41 | * (so, if you use this somewhere else, you may need to | |
| 42 | * fix it...) | |
| 43 | */ | |
| 44 | ||
| 45 | /* bunequal(s1, s2, n) */ | |
| 46 | ||
| 47 | #include "defs.h" | |
| 48 | ||
| 49 | ENTRY(bunequal) | |
| 50 | movl 4(ap),r1 | |
| 51 | movl 8(ap),r3 | |
| 52 | movl 12(ap),r4 | |
| 53 | 1: | |
| 54 | movzwl $65535,r0 | |
| 55 | cmpl r4,r0 | |
| 56 | jleq 2f | |
| 57 | subl2 r0,r4 | |
| 58 | cmpc3 r0,(r1),(r3) | |
| 59 | jeql 1b | |
| 60 | addl2 r4,r0 | |
| 61 | /* changes... */ | |
| 62 | subl3 r0,12(ap),r0 | |
| 63 | /* end of changes for bunequal... */ | |
| 64 | ret | |
| 65 | 2: | |
| 66 | cmpc3 r4,(r1),(r3) | |
| 67 | /* changes... */ | |
| 68 | subl3 r0,12(ap),r0 | |
| 69 | /* end of changes for bunequal... */ | |
| 70 | ret | |
| 71 | ||
| 72 | ||
| 73 | ||
| 74 | ||
| 75 | /* brand new code, using the above as base... */ | |
| 76 | /* bskip(s1, n, b) : finds the first occurrence of any byte != 'b' in the 'n' | |
| 77 | * bytes beginning at 's1'. | |
| 78 | * | |
| 79 | * BUGNOTE: This has no chance of working for lengths greater than 64K. | |
| 80 | * (so, if you use this somewhere else, you may need to | |
| 81 | * fix it...) | |
| 82 | */ | |
| 83 | ||
| 84 | ENTRY(bskip) | |
| 85 | movl 4(ap),r1 | |
| 86 | movl 8(ap),r3 | |
| 87 | movl 12(ap),r4 | |
| 88 | 1: | |
| 89 | movzwl $65535,r0 | |
| 90 | cmpl r3,r0 | |
| 91 | jleq 2f | |
| 92 | subl2 r0,r3 | |
| 93 | skpc r4,r0,(r1) | |
| 94 | jeql 1b | |
| 95 | addl2 r3,r0 | |
| 96 | subl3 r0,8(ap),r0 | |
| 97 | ret | |
| 98 | 2: | |
| 99 | skpc r4,r3,(r1) | |
| 100 | subl3 r0,8(ap),r0 | |
| 101 | ret |