1*a6a8f007Sskrll /* $NetBSD: strrchr.c,v 1.7 2020/04/07 08:07:58 skrll Exp $ */
237c9f0a6Schristos
337c9f0a6Schristos /*
437c9f0a6Schristos * Copyright (c) 1988, 1993
537c9f0a6Schristos * The Regents of the University of California. All rights reserved.
637c9f0a6Schristos *
737c9f0a6Schristos * Redistribution and use in source and binary forms, with or without
837c9f0a6Schristos * modification, are permitted provided that the following conditions
937c9f0a6Schristos * are met:
1037c9f0a6Schristos * 1. Redistributions of source code must retain the above copyright
1137c9f0a6Schristos * notice, this list of conditions and the following disclaimer.
1237c9f0a6Schristos * 2. Redistributions in binary form must reproduce the above copyright
1337c9f0a6Schristos * notice, this list of conditions and the following disclaimer in the
1437c9f0a6Schristos * documentation and/or other materials provided with the distribution.
1537c9f0a6Schristos * 3. Neither the name of the University nor the names of its contributors
1637c9f0a6Schristos * may be used to endorse or promote products derived from this software
1737c9f0a6Schristos * without specific prior written permission.
1837c9f0a6Schristos *
1937c9f0a6Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2037c9f0a6Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2137c9f0a6Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2237c9f0a6Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2337c9f0a6Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2437c9f0a6Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2537c9f0a6Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2637c9f0a6Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2737c9f0a6Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2837c9f0a6Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2937c9f0a6Schristos * SUCH DAMAGE.
3037c9f0a6Schristos */
3137c9f0a6Schristos
3237c9f0a6Schristos #include <sys/cdefs.h>
3337c9f0a6Schristos #if defined(LIBC_SCCS) && !defined(lint)
3437c9f0a6Schristos #if 0
3537c9f0a6Schristos static char sccsid[] = "@(#)rindex.c 8.1 (Berkeley) 6/4/93";
3637c9f0a6Schristos #else
37*a6a8f007Sskrll __RCSID("$NetBSD: strrchr.c,v 1.7 2020/04/07 08:07:58 skrll Exp $");
3837c9f0a6Schristos #endif
3937c9f0a6Schristos #endif /* LIBC_SCCS and not lint */
4037c9f0a6Schristos
4137c9f0a6Schristos #if !defined(_KERNEL) && !defined(_STANDALONE)
4237c9f0a6Schristos #include <assert.h>
4337c9f0a6Schristos #include <string.h>
4437c9f0a6Schristos #else
4537c9f0a6Schristos #include <lib/libkern/libkern.h>
4637c9f0a6Schristos #endif
4737c9f0a6Schristos
48*a6a8f007Sskrll #if defined(KASAN)
49*a6a8f007Sskrll #undef strrchr
50*a6a8f007Sskrll #endif
51*a6a8f007Sskrll
__strong_alias(rindex,strrchr)5253a0f227Sdsl __strong_alias(rindex, strrchr)
5337c9f0a6Schristos char *
54a8565cf9Schristos strrchr(const char *p, int ch)
5537c9f0a6Schristos {
56ececdb79Smartin char *save;
57ececdb79Smartin const char c = ch;
5837c9f0a6Schristos
5937c9f0a6Schristos for (save = NULL;; ++p) {
60d5e6ed89Smartin if (*p == c) {
6137c9f0a6Schristos /* LINTED const cast-away */
6237c9f0a6Schristos save = __UNCONST(p);
6337c9f0a6Schristos }
6437c9f0a6Schristos if (!*p)
6537c9f0a6Schristos return(save);
6637c9f0a6Schristos }
6737c9f0a6Schristos /* NOTREACHED */
6837c9f0a6Schristos }
69