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Annotation of 43BSDReno/lib/libc/hp300/string/strncpy.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:  * This code is derived from software contributed to Berkeley by
                      6:  * the Systems Programming Group of the University of Utah Computer
                      7:  * Science Department.
                      8:  *
                      9:  * Redistribution and use in source and binary forms are permitted
                     10:  * provided that: (1) source distributions retain this entire copyright
                     11:  * notice and comment, and (2) distributions including binaries display
                     12:  * the following acknowledgement:  ``This product includes software
                     13:  * developed by the University of California, Berkeley and its contributors''
                     14:  * in the documentation or other materials provided with the distribution
                     15:  * and in all advertising materials mentioning features or use of this
                     16:  * software. Neither the name of the University nor the names of its
                     17:  * contributors may be used to endorse or promote products derived
                     18:  * from this software without specific prior written permission.
                     19:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     21:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     22:  */
                     23: 
                     24: #if defined(LIBC_SCCS) && !defined(lint)
                     25:        .asciz "@(#)strncpy.s   5.1 (Berkeley) 5/12/90"
                     26: #endif /* LIBC_SCCS and not lint */
                     27: 
                     28: #include "DEFS.h"
                     29: 
                     30: ENTRY(strncpy)
                     31:        movl    sp@(4),d0       /* return value is toaddr */
                     32:        movl    sp@(12),d1      /* count */
                     33:        jeq     scdone          /* nothing to do */
                     34:        movl    sp@(8),a0       /* a0 = fromaddr */
                     35:        movl    d0,a1           /* a1 = toaddr */
                     36: scloop:
                     37:        movb    a0@+,a1@+       /* copy a byte */
                     38:        jeq     scploop         /* copied null, go pad if necessary */
                     39:        subql   #1,d1           /* adjust count */
                     40:        jne     scloop          /* more room, keep going */
                     41: scdone:
                     42:        rts
                     43: scploop:
                     44:        subql   #1,d1           /* adjust count */
                     45:        jeq     scdone          /* no more room, all done */
                     46:        clrb    a1@+            /* clear a byte */
                     47:        jra     scploop         /* keep going */

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