* Copyright (c) 1993 Winning Strategies, Inc.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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 Winning Strategies, Inc.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
* $Id: memset.s,v 1.3 1993/08/16 17:06:35 jtc Exp $
#if defined(LIBC_RCS) && !defined(lint)
.asciz "$Id: memset.s,v 1.3 1993/08/16 17:06:35 jtc Exp $"
#endif /* LIBC_RCS and not lint */
* memset(void *b, int c, size_t len)
* write len bytes of value c (converted to an unsigned char) to
* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
movzbl 16(%esp),%eax /* unsigned char, zero extend */
pushl %edi /* push address of buffer */
cld /* set fill direction forward */
* if the string is too short, it's really not worth the overhead
* of aligning to word boundries, etc. So we jump to a plain
movl %eax,%edx /* copy value to all bytes in word */
sall $8,%edx /* XXX is there a better way? */
movl %edi,%edx /* compute misalignment */
movl %edx,%ecx /* set until word aligned */
shrl $2,%ecx /* set by words */
movl %ebx,%ecx /* set remainder by bytes */
popl %eax /* pop address of buffer */