1992-05-13 10:52:32 +08:00
|
|
|
/*
|
|
|
|
|
* Copyright (c) 1983 Regents of the University of California.
|
|
|
|
|
* All rights reserved.
|
|
|
|
|
*
|
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
|
* are met:
|
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
* may be used to endorse or promote products derived from this software
|
|
|
|
|
* without specific prior written permission.
|
|
|
|
|
*
|
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
* SUCH DAMAGE.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
|
|
|
.asciz "@(#)strncmp.s 5.6 (Berkeley) 6/1/90"
|
|
|
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Compare at most n characters of string
|
|
|
|
|
* s1 lexicographically to string s2.
|
|
|
|
|
* Return:
|
|
|
|
|
* 0 s1 == s2
|
|
|
|
|
* > 0 s1 > s2
|
|
|
|
|
* < 0 s2 < s2
|
|
|
|
|
*
|
|
|
|
|
* strncmp(s1, s2, n)
|
|
|
|
|
* char *s1, *s2;
|
|
|
|
|
* int n;
|
|
|
|
|
*/
|
|
|
|
|
#include "DEFS.h"
|
|
|
|
|
|
|
|
|
|
ENTRY(strncmp, 0)
|
|
|
|
|
movl 4(ap),r1 # r1 = s1
|
|
|
|
|
movq 8(ap),r3 # r3 = s2; r4 = n
|
|
|
|
|
1:
|
1996-12-20 09:35:29 +08:00
|
|
|
clrl r5 # calculate min bytes to next page boundary
|
1992-05-13 10:52:32 +08:00
|
|
|
subb3 r1,$255,r5 # r5 = (bytes - 1) to end of page for s1
|
|
|
|
|
subb3 r3,$255,r0 # r0 = (bytes - 1) to end of page for s2
|
|
|
|
|
cmpb r0,r5 # r5 = min(r0, r5);
|
|
|
|
|
bgtru 2f
|
|
|
|
|
movb r0,r5
|
|
|
|
|
2:
|
1996-12-20 09:35:29 +08:00
|
|
|
incl r5 # r5 = min bytes to next page boundary
|
1992-05-13 10:52:32 +08:00
|
|
|
cmpl r4,r5 # r5 = min(n, r5);
|
|
|
|
|
bgeq 3f
|
|
|
|
|
movl r4,r5
|
|
|
|
|
3:
|
|
|
|
|
cmpc3 r5,(r1),(r3) # compare strings
|
|
|
|
|
bneq 4f
|
|
|
|
|
subl2 r5,r4 # check for end of comparison
|
|
|
|
|
beql 5f
|
|
|
|
|
subl2 r5,r1 # check if found null yet
|
|
|
|
|
locc $0,r5,(r1)
|
|
|
|
|
beql 1b # not yet done, continue checking
|
|
|
|
|
subl2 r0,r3
|
|
|
|
|
mnegb (r3),r0 # r0 = '\0' - *s2
|
|
|
|
|
cvtbl r0,r0
|
|
|
|
|
ret
|
|
|
|
|
4:
|
|
|
|
|
subl2 r0,r5 # check for null in matching string
|
|
|
|
|
subl2 r5,r1
|
|
|
|
|
locc $0,r5,(r1)
|
|
|
|
|
bneq 5f
|
|
|
|
|
subb3 (r3),(r1),r0 # r0 = *s1 - *s2
|
|
|
|
|
cvtbl r0,r0
|
|
|
|
|
ret
|
|
|
|
|
5:
|
|
|
|
|
clrl r0 # both the same to null
|
|
|
|
|
ret
|
