NetBSD/sys/lib/libkern/strchr.c

72 lines
2.7 KiB
C

/*-
* Copyright (c) 1990 The Regents of the University of California.
* 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 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 *sccsid = "from: @(#)index.c 5.7 (Berkeley) 2/24/91";*/
static char *rcsid = "$NetBSD: strchr.c,v 1.2 1997/10/13 11:55:47 lukem Exp $";
#endif /* LIBC_SCCS and not lint */
/*
* XXX This file copied from libc's "index.c", but with the
* "#define STRCHR" and the #ifndef _KERNEL goop added below.
*
* It'd be nice to include the file here unchanged from the libc
* version (and, preferably, with the same name) but I didn't want to
* include the baroque strchr/index + asm/C rules here in libkern.
*/
#define STRCHR
#ifndef _KERNEL
#include <string.h>
#else
#include <lib/libkern/libkern.h>
#define NULL ((char *)0)
#endif
char *
#ifdef STRCHR
strchr(p, ch)
#else
index(p, ch)
#endif
register const char *p, ch;
{
for (;; ++p) {
if (*p == ch)
return((char *)p);
if (!*p)
return((char *)NULL);
}
/* NOTREACHED */
}