1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 
24 #include <ast.h>
25 
26 #if _lib_memchr
27 
28 NoN(memchr)
29 
30 #else
31 
32 /*
33  * Return the ptr in sp at which the character c appears;
34  * 0 if not found in n chars; don't stop at \0.
35  */
36 
37 void*
38 memchr(const void* asp, register int c, size_t n)
39 {
40 	register const char*	sp = (char*)asp;
41 	register const char*	ep = sp + n;
42 
43 	while (sp < ep)
44 		if (*sp++ == c)
45 			return(--sp);
46 	return(0);
47 }
48 
49 #endif
50