Import unmodified NetBSD libc in trunk

This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.

lib/nbsd_libc/string/strpbrk.c

@@ -0,0 +1,70 @@
+/*	$NetBSD: strpbrk.c,v 1.19 2008/09/24 16:58:53 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2008 Joerg Sonnenberger
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: strpbrk.c,v 1.19 2008/09/24 16:58:53 christos Exp $");
+
+#include <assert.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <string.h>
+
+#define FAST_STRPBRK 1
+#define UC(a) ((unsigned int)(unsigned char)(a))
+
+#ifdef FAST_STRPBRK
+#define ADD_NEW_TO_SET(i) (set[inv[i] = idx++] = (i))
+#define IS_IN_SET(i) (inv[i] < idx && set[inv[i]] == (i))
+#define ADD_TO_SET(i) (void)(IS_IN_SET(i) || /*LINTED no effect*/ADD_NEW_TO_SET(i))
+#else
+#define IS_IN_SET(i) (set[(i) >> 3] & idx[(i) & 7])
+#define ADD_TO_SET(i) (void)(set[(i) >> 3] |= idx[(i) & 7])
+#endif
+
+char *
+strpbrk(const char *s, const char *charset)
+{
+#ifdef FAST_STRPBRK
+	uint8_t set[256], inv[256], idx = 0;
+#else
+	static const size_t idx[8] = { 1, 2, 4, 8, 16, 32, 64, 128 };
+	uint8_t set[32];
+
+	(void)memset(set, 0, sizeof(set));
+#endif
+
+	_DIAGASSERT(s != NULL);
+	_DIAGASSERT(charset != NULL);
+
+	for (; *charset != '\0'; ++charset)
+		ADD_TO_SET(UC(*charset));
+
+	for (; *s != '\0'; ++s)
+		if (IS_IN_SET(UC(*s)))
+			return __UNCONST(s);
+	return NULL;
+}