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