sysdeps/vax/strspn.s

   1 /*-
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31         .asciz "@(#)strspn.s    5.1 (Berkeley) 5/15/90"
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 /*
  35  * Span the string s2 (skip characters that are in s2).
  36  * Return the number of characters in s1 that were skipped.
  37  *
  38  * size_t
  39  * strspn(s1, s2)
  40  *      const char *s1, *s2;
  41  */
  42 #include "DEFS.h"
  43
  44 ENTRY(strspn, 0)
  45         subl2   $32,sp          /* make 256 bit table */
  46         movc5   $0,(sp),$0,$32,(sp)
  47         movq    4(ap),r1        /* r1 = s1, r2 = s2 */
  48
  49         /* turn on bit for each character in s2, including '\0' */
  50 1:
  51         movzbl  (r2)+,r0
  52         bbss    r0,(sp),1b
  53         bneq    1b
  54
  55         /* now clear bit for '\0' */
  56         /* (this is easier than avoiding setting it in the first place) */
  57         bicb2   $1,(sp)         /* stop at '\0' */
  58         movl    r1,r0           /* r0 = s (current pos in s1) */
  59
  60         /* look for a character that is not in s2 */
  61 2:
  62         movzbl  (r0)+,r2        /* c = *s++ */
  63         bbs     r2,(sp),2b      /* loop while c is in table */
  64         decl    r0              /* s-- */
  65         subl2   r1,r0           /* r0 = s - s1 = count */
  66         ret