uclibc-ng/libc/string/memrchr.c

/*
 * Copyright (C) 2002     Manuel Novoa III
 * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include "_string.h"

libc_hidden_proto(memrchr)

void *memrchr(const void *s, int c, size_t n)
{
	register const unsigned char *r;
#ifdef __BCC__
	/* bcc can optimize the counter if it thinks it is a pointer... */
	register const char *np = (const char *) n;
#else
#define np n
#endif
	
	r = ((unsigned char *)s) + ((size_t) np);

	while (np) {
		if (*--r == ((unsigned char)c)) {
			return (void *) r;	/* silence the warning */
		}
		--np;
	}

	return NULL;
}
#undef np

libc_hidden_def(memrchr)