diff options
Diffstat (limited to 'sys/lib/libkern/memcmp.c')
| -rw-r--r-- | sys/lib/libkern/memcmp.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sys/lib/libkern/memcmp.c b/sys/lib/libkern/memcmp.c new file mode 100644 index 00000000000..773398e9387 --- /dev/null +++ b/sys/lib/libkern/memcmp.c @@ -0,0 +1,66 @@ +/* $OpenBSD: memcmp.c,v 1.1 2000/06/16 20:20:30 millert Exp $ */ + +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * 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) +static char *rcsid = "$OpenBSD: memcmp.c,v 1.1 2000/06/16 20:20:30 millert Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#ifndef _KERNEL +#include <string.h> +#else +#include <lib/libkern/libkern.h> +#endif + +/* + * Compare memory regions. + */ +int +memcmp(s1, s2, n) + const void *s1, *s2; + size_t n; +{ + if (n != 0) { + register const unsigned char *p1 = s1, *p2 = s2; + + do { + if (*p1++ != *p2++) + return (*--p1 - *--p2); + } while (--n != 0); + } + return (0); +} |