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4649a470 C |
1 | /* |
2 | * Copyright (c) 1993 Winning Strategies, Inc. | |
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 Winning Strategies, Inc. | |
16 | * 4. The name of the author may not be used to endorse or promote products | |
17 | * derived from this software withough specific prior written permission | |
18 | * | |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
29 | * | |
30 | * $Id: memchr.s,v 1.3 1993/08/16 17:06:32 jtc Exp $ | |
31 | */ | |
32 | ||
33 | #if defined(LIBC_RCS) && !defined(lint) | |
34 | .asciz "$Id: memchr.s,v 1.3 1993/08/16 17:06:32 jtc Exp $" | |
35 | #endif /* LIBC_RCS and not lint */ | |
36 | ||
37 | #include "DEFS.h" | |
38 | ||
39 | /* | |
40 | * memchr (b, c, len) | |
41 | * locates the first occurance of c in string b. | |
42 | * | |
43 | * Written by: | |
44 | * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. | |
45 | */ | |
46 | ||
47 | ENTRY(memchr) | |
48 | pushl %edi | |
49 | movl 8(%esp),%edi /* string address */ | |
50 | movl 12(%esp),%eax /* set character to search for */ | |
51 | movl 16(%esp),%ecx /* set length of search */ | |
52 | testl %eax,%eax /* clear Z flag, for len == 0 */ | |
53 | cld /* set search forward */ | |
54 | repne /* search! */ | |
55 | scasb | |
56 | jnz L1 /* scan failed, return null */ | |
57 | leal -1(%edi),%eax /* adjust result of scan */ | |
58 | popl %edi | |
59 | ret | |
60 | .align 2,0x90 | |
61 | L1: xorl %eax,%eax | |
62 | popl %edi | |
63 | ret |