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-/*
- * 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