Added kernel_args_strdup() function as a strdup() replacement.

Added a ToDo comment.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7500 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/boot/loader/kernel_args.cpp

@@ -9,6 +9,12 @@
 #include <boot/stage2.h>
 #include <boot/platform.h>
 
+#include <string.h>
+
+
+// ToDo: the kernel_args heap chunks need to be remembered in the kernel_args
+//	structure, so that unneeded memory can be freed in the kernel again.
+
 
 static const size_t kChunkSize = 16384;
 
@@ -60,6 +66,27 @@ kernel_args_malloc(size_t size)
 }
 
 
+/** Convenience function that copies strdup() functions for the
+ *	kernel args heap.
+ */
+
+extern "C" char *
+kernel_args_strdup(const char *string)
+{
+	if (string == NULL || string[0] == '\0')
+		return NULL;
+
+	size_t length = strlen(string) + 1;
+
+	char *target = (char *)kernel_args_malloc(length);
+	if (target == NULL)
+		return NULL;
+
+	memcpy(target, string, length);
+	return target;
+}
+
+
 /** This function frees a block allocated via kernel_args_malloc().
  *	It's very simple; it can only free the last allocation. It's
  *	enough for its current usage in the boot loader, though.