Added a BeOS compatible strdup() implementation; unlike other strdup()

implementations (and against its standard behaviour), it does now
handle a NULL string parameter gracefully.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3485 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/posix/string/strdup.c

@@ -0,0 +1,30 @@
+/* 
+** Copyright 2003, Axel Dörfler, [email protected]. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+
+
+#include <string.h>
+#include <stdlib.h>
+
+
+char *
+strdup(const char *string)
+{
+	char *copied;
+	size_t length;
+
+	// unlike the standard strdup() function, the BeOS implementation
+	// handles NULL strings gracefully
+	if (string == NULL)
+		return NULL;
+
+	length = strlen(string) + 1;
+
+	if ((copied = (char *)malloc(length)) == NULL)
+		return NULL;
+
+	memcpy(copied, string, length);
+	return copied;
+}
+