Annotation of sys/lib/libkern/arch/m68k/strncmp.S, Revision 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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