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strchr.c revision 1.2.4.1 
      1 /*	strchr.c,v 1.2 2007/06/04 18:19:27 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("strchr.c,v 1.2 2007/06/04 18:19:27 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 *
     50 #ifdef INDEX
     51 index(const char *p, int ch)
     52 #else
     53 strchr(const char *p, int ch)
     54 #endif
     55 {
     56 	const char cmp = ch;
     57 	_DIAGASSERT(p != NULL);
     58 
     59 	for (;; ++p) {
     60 		if (*p == cmp) {
     61 			/* LINTED const cast-away */
     62 			return(__UNCONST(p));
     63 		}
     64 		if (!*p)
     65 			return((char *)NULL);
     66 	}
     67 	/* NOTREACHED */
     68 }
     69