Annotation of sys/lib/libkern/arch/m68k/strncmp.S, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: strncmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $ */
2:
3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * the Systems Programming Group of the University of Utah Computer
9: * Science Department.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #if defined(LIBC_SCCS) && !defined(lint)
37: .text
38: /*.asciz "from: @(#)strncmp.s 5.1 (Berkeley) 5/12/90"*/
39: .asciz "$OpenBSD: strncmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $"
40: #endif /* LIBC_SCCS and not lint */
41:
42: #include "DEFS.h"
43:
44: /*
45: * NOTE: this guy returns result compatible with the VAX assembly version.
46: * The C version on the portable gen directory returns different results
47: * (different signs!) when comparing chars with the high bit on. Who is
48: * right??
49: */
50: ENTRY(strncmp)
51: movl sp@(12),d1 | count
52: beq scdone | nothing to do
53: movl sp@(4),a0 | a0 = string1
54: movl sp@(8),a1 | a1 = string2
55: scloop:
56: movb a0@+,d0 | get *string1
57: cmpb a1@+,d0 | compare a byte
58: bne scexit | not equal, break out
59: tstb d0 | at end of string1?
60: beq scdone | yes, all done
61: subql #1,d1 | no, adjust count
62: bne scloop | more to do, keep going
63: scdone:
64: moveq #0,d0 | strings are equal
65: rts
66: scexit:
67: subb a1@-,d0 | *string1 - *string2
68: extbl d0
69: rts
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