index.c revision 1.10 
1/*	$NetBSD: index.c,v 1.10 1999/09/16 11:45:40 lukem 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)index.c	8.1 (Berkeley) 6/4/93";
40#else
41__RCSID("$NetBSD: index.c,v 1.10 1999/09/16 11:45:40 lukem Exp $");
42#endif
43#endif /* LIBC_SCCS and not lint */
44
45#if !defined(_KERNEL) && !defined(_STANDALONE)
46#include "namespace.h"
47#include <assert.h>
48#include <string.h>
49#else
50#include <lib/libkern/libkern.h>
51#define	_DIAGASSERT(x)	(void)0
52#define	NULL		((char *)0)
53#endif
54
55char *
56#ifdef STRCHR
57strchr(p, ch)
58#else
59index(p, ch)
60#endif
61	const char *p, ch;
62{
63	_DIAGASSERT(p != NULL);
64#ifdef _DIAGNOSTIC
65	if (p == NULL)
66		return (NULL);
67#endif
68
69	for (;; ++p) {
70		if (*p == ch)
71			return((char *)p);
72		if (!*p)
73			return((char *)NULL);
74	}
75	/* NOTREACHED */
76}
77