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Annotation of 43BSDReno/lib/libc/vax/string/strcspn.s, revision 1.1.1.1

1.1       root        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 are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21:        .asciz "@(#)strcspn.s   5.1 (Berkeley) 5/15/90"
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: /*
                     25:  * Span the complement of string s2 (skip characters that are not in s2).
                     26:  * Return the number of characters in s1 that were skipped.
                     27:  *
                     28:  * size_t
                     29:  * strcspn(s1, s2)
                     30:  *     const char *s1, *s2;
                     31:  */
                     32: #include "DEFS.h"
                     33: 
                     34: ENTRY(strcspn, 0)
                     35:        subl2   $32,sp          /* make 256 bit table */
                     36:        movc5   $0,(sp),$0,$32,(sp)
                     37:        movq    4(ap),r1        /* r1 = s1, r2 = s2 */
                     38: 
                     39:        /* turn on bit for each character in s2, including '\0' */
                     40: 1:
                     41:        movzbl  (r2)+,r0
                     42:        bbss    r0,(sp),1b
                     43:        bneq    1b
                     44:        movl    r1,r0           /* r0 = s (current pos in s1) */
                     45: 
                     46:        /* look for a character that is in s2 */
                     47: 2:
                     48:        movzbl  (r0)+,r2        /* c = *s++ */
                     49:        bbc     r2,(sp),2b      /* loop until c is in table */
                     50:        decl    r0              /* s-- */
                     51:        subl2   r1,r0           /* r0 = s - s1 = count */
                     52:        ret

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