my previous version was wrong; this one is right

[unix-history] / usr / src / lib / libc / string / memchr.c

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)memchr.c	5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>
#include <string.h>

void *
memchr(s, c, n)
	const void *s;
	register unsigned char c;
	register size_t n;
{
	if (n != 0) {
		register const unsigned char *p = s;

		do {
			if (*p++ == c)
				return ((void *)(p - 1));
		} while (--n != 0);
	}
	return (NULL);
}