Add strchrnul

common/lib/libc/string/strchrnul.c

@@ -0,0 +1,62 @@
+/*	$NetBSD: strchrnul.c,v 1.1 2016/10/12 20:01:40 christos Exp $	*/
+
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)index.c	8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: strchrnul.c,v 1.1 2016/10/12 20:01:40 christos Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+#include "namespace.h"
+#include <assert.h>
+#include <string.h>
+#else
+#include <lib/libkern/libkern.h>
+#endif
+
+char *
+strchrnul(const char *p, int ch)
+{
+	const char cmp = ch;
+	_DIAGASSERT(p != NULL);
+
+	for (;; ++p) {
+		if (*p == cmp || !*p) {
+			/* LINTED const cast-away */
+			return __UNCONST(p);
+		}
+	}
+	/* NOTREACHED */
+}