1 /* $NetBSD: strchrnul.c,v 1.1 2016/10/12 20:01:40 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)index.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: strchrnul.c,v 1.1 2016/10/12 20:01:40 christos Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #if !defined(_KERNEL) && !defined(_STANDALONE)
42 #include "namespace.h"
43 #include <assert.h>
44 #include <string.h>
45 #else
46 #include <lib/libkern/libkern.h>
47 #endif
48
49 char *
strchrnul(const char * p,int ch)50 strchrnul(const char *p, int ch)
51 {
52 const char cmp = ch;
53 _DIAGASSERT(p != NULL);
54
55 for (;; ++p) {
56 if (*p == cmp || !*p) {
57 /* LINTED const cast-away */
58 return __UNCONST(p);
59 }
60 }
61 /* NOTREACHED */
62 }
63