diff options
Diffstat (limited to 'sys/lib/libkern/arch/m68k/strncpy.S')
| -rw-r--r-- | sys/lib/libkern/arch/m68k/strncpy.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/sys/lib/libkern/arch/m68k/strncpy.S b/sys/lib/libkern/arch/m68k/strncpy.S new file mode 100644 index 00000000000..9e8faa78860 --- /dev/null +++ b/sys/lib/libkern/arch/m68k/strncpy.S @@ -0,0 +1,63 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) + .text + /*.asciz "from: @(#)strncpy.s 5.1 (Berkeley) 5/12/90"*/ + .asciz "$Id: strncpy.S,v 1.1.1.1 1995/10/18 08:52:53 deraadt Exp $" +#endif /* LIBC_SCCS and not lint */ + +#include "DEFS.h" + +ENTRY(strncpy) + movl sp@(4),d0 | return value is toaddr + movl sp@(12),d1 | count + beq scdone | nothing to do + movl sp@(8),a0 | a0 = fromaddr + movl d0,a1 | a1 = toaddr +scloop: + movb a0@+,a1@+ | copy a byte + beq scploop | copied null, go pad if necessary + subql #1,d1 | adjust count + bne scloop | more room, keep going +scdone: + rts +scploop: + subql #1,d1 | adjust count + beq scdone | no more room, all done + clrb a1@+ | clear a byte + jra scploop | keep going |