initial import

internal commit: 14ac2bc2299032fa6714d1fefa7cf0987b3e3085

Signed-off-by: Eddie Dong <eddie.dong@intel.com>

lib/strnlen.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2018 Intel Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * 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.
+ *   * Neither the name of Intel Corporation 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 COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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 <rtl.h>
+
+
+/**
+ *
+ *    strnlen_s
+ *
+ * description:
+ *    The function calculates the length of the string pointed
+ *    to by str.
+ *
+ *
+ * input:
+ *    str      pointer to the null-terminated string to be examined.
+ *
+ *    dmax      maximum number of characer to examine.
+ *
+ *
+ * return value:
+ *    string length, excluding the null character.
+ *    will return 0 if str is null.
+ */
+size_t strnlen_s(const char *str, size_t maxlen)
+{
+	size_t count;
+
+	if (str == NULL)
+		return 0;
+
+	count = 0;
+	while (*str) {
+		if (maxlen == 0)
+			break;
+
+		count++;
+		maxlen--;
+		str++;
+	}
+
+	return count;
+}