split on ^@

I'm trying to create a list of file using globpath(). The problem is that globpath returns them as a single string, the other problem is that some of the files contains white spaces in their path. Here is what I came up with

call writefile(split(escape(globpath(s:dir_str, '*.[hc]'), ' '), "^@"), s:myfile)

The ^@ symbol shows up when globpath is written to a file without splitting it, i.e if you do the following, your files will separated with ^@

writefile([escape(globpath(s:dir_str, '*.[hc]'), ' ')], s:myfile)

The problem is that split doesn't recognize ^@. I get the following errors

E114: Missing quote: "
E116: Invalid arguments for function split(escape(globpath(s:dir_str, '*.[hc]'), ' '), "
E116: Invalid arguments for function writefile

Does anybody know how to make split recognize this funny symbol?

Any help is appreciated.

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