diff options
Diffstat (limited to 'lib/libc/i386/string/memchr.S')
| -rw-r--r-- | lib/libc/i386/string/memchr.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/lib/libc/i386/string/memchr.S b/lib/libc/i386/string/memchr.S new file mode 100644 index 0000000..639077d --- /dev/null +++ b/lib/libc/i386/string/memchr.S @@ -0,0 +1,58 @@ +/* + * Copyright (c) 1993 Winning Strategies, Inc. + * All rights reserved. + * + * 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 Winning Strategies, Inc. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without 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. + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + +/* + * memchr (b, c, len) + * locates the first occurance of c in string b. + * + * Written by: + * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. + */ + +ENTRY(memchr) + pushl %edi + movl 8(%esp),%edi /* string address */ + movl 12(%esp),%eax /* set character to search for */ + movl 16(%esp),%ecx /* set length of search */ + testl %esp,%esp /* clear Z flag, for len == 0 */ + cld /* set search forward */ + repne /* search! */ + scasb + jnz L1 /* scan failed, return null */ + leal -1(%edi),%eax /* adjust result of scan */ + popl %edi + ret + .align 2,0x90 +L1: xorl %eax,%eax + popl %edi + ret |
