usr/src/lib/libc/vax/string/strlen.s

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
        .asciz "@(#)strlen.s    5.6 (Berkeley) 6/1/90"
#endif /* LIBC_SCCS and not lint */

/*
 * Return the length of cp (not counting '\0').
 *
 * strlen(cp)
 *      char *cp;
 */
#include "DEFS.h"

ENTRY(strlen, 0)
        movl    4(ap),r1
1:
        locc    $0,$65535,(r1)  # look for '\0'
        beql    1b
        subl3   4(ap),r1,r0     # len = cp - base
        ret