mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
114 lines
3.5 KiB
ArmAsm
114 lines
3.5 KiB
ArmAsm
|
/*
|
||
|
|
* 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.
|
||
|
|
* 3. All advertising materials mentioning features or use of this software
|
||
|
|
* must display the following acknowledgement:
|
||
|
|
* This product includes software developed by the University of
|
||
|
|
* California, Berkeley and its contributors.
|
||
|
|
* 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 "@(#)rindex.s 5.6 (Berkeley) 6/1/90"
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Find the last occurence of c in the string cp.
|
||
|
|
* Return pointer to match or null pointer.
|
||
|
|
*
|
||
|
|
* char *
|
||
|
|
* rindex(cp, c)
|
||
|
|
* char *cp, c;
|
||
|
|
*/
|
||
|
|
#include "DEFS.h"
|
||
|
|
|
||
|
|
ENTRY(rindex, 0)
|
||
|
|
movq 4(ap),r1 # r1 = cp; r2 = c
|
||
|
|
tstl r2 # check for special case c == '\0'
|
||
|
|
bneq 2f
|
||
|
|
1:
|
||
|
|
locc $0,$65535,(r1) # just find end of string
|
||
|
|
beql 1b # still looking
|
||
|
|
movl r1,r0 # found it
|
||
|
|
ret
|
||
|
|
2:
|
||
|
|
moval tbl,r3 # r3 = address of table
|
||
|
|
bbss $0,(r3),5f # insure not reentering
|
||
|
|
movab (r3)[r2],r5 # table entry for c
|
||
|
|
incb (r5)
|
||
|
|
clrl r4 # last found
|
||
|
|
3:
|
||
|
|
scanc $65535,(r1),(r3),$1 # look for c or '\0'
|
||
|
|
beql 3b # keep looking
|
||
|
|
tstb (r1) # if have found '\0'
|
||
|
|
beql 4f # we are done
|
||
|
|
movl r1,r4 # save most recently found
|
||
|
|
incl r1 # skip over character
|
||
|
|
jbr 3b # keep looking
|
||
|
|
4:
|
||
|
|
movl r4,r0 # return last found (if any)
|
||
|
|
clrb (r5) # clean up table
|
||
|
|
clrb (r3)
|
||
|
|
ret
|
||
|
|
|
||
|
|
.data
|
||
|
|
tbl: .space 256
|
||
|
|
.text
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Reentrant, but slower version of rindex
|
||
|
|
*/
|
||
|
|
5:
|
||
|
|
movl r1,r3
|
||
|
|
clrl r4 # r4 = pointer to last match
|
||
|
|
6:
|
||
|
|
locc $0,$65535,(r3) # look for '\0'
|
||
|
|
bneq 8f
|
||
|
|
decw r0 # r0 = 65535
|
||
|
|
1:
|
||
|
|
locc r2,r0,(r3) # look for c
|
||
|
|
bneq 7f
|
||
|
|
movl r1,r3 # reset pointer and ...
|
||
|
|
jbr 6b # ... try again
|
||
|
|
7:
|
||
|
|
movl r1,r4 # stash pointer ...
|
||
|
|
addl3 $1,r1,r3 # ... skip over match and ...
|
||
|
|
decl r0 # ... decrement count
|
||
|
|
jbr 6b # ... try again
|
||
|
|
8:
|
||
|
|
subl3 r3,r1,r0 # length of short block
|
||
|
|
incl r0 # +1 for '\0'
|
||
|
|
9:
|
||
|
|
locc r2,r0,(r3) # look for c
|
||
|
|
beql 0f
|
||
|
|
movl r1,r4 # stash pointer ...
|
||
|
|
addl3 $1,r1,r3 # ... skip over match ...
|
||
|
|
decl r0 # ... adjust count and ...
|
||
|
|
jbr 9b # ... try again
|
||
|
|
0:
|
||
|
|
movl r4,r0 # return stashed pointer
|
||
|
|
ret
|