2 * Copyright (c) 1993 Winning Strategies, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Winning Strategies, Inc.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include <machine/asm.h>
32 __FBSDID("$FreeBSD$");
36 * append a copy of the null-terminated string "append" to the end
37 * of the null-terminated string s, then add a terminating `\0'.
40 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
44 * I've unrolled the loop eight times: large enough to make a
45 * significant difference, and small enough not to totally trash the
50 pushl %edi /* save edi */
51 movl 8(%esp),%edi /* dst address */
52 movl 12(%esp),%edx /* src address */
53 pushl %edi /* push destination address */
55 cld /* set search forward */
56 xorl %eax,%eax /* set search for null terminator */
57 movl $-1,%ecx /* set search for lots of characters */
61 leal -1(%edi),%ecx /* correct dst address */
64 L1: movb (%edx),%al /* unroll loop, but not too much */
98 L2: popl %eax /* pop destination address */
99 popl %edi /* restore edi */