# the bootstrap Init currently exposes only io; macOS provides process-lifetime argv storage.
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_NSGetArgc c_func() @c_int

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_NSGetArgv c_func() @*[*;0]u8

argument_count proc() usize {
    return usize(_NSGetArgc()^)
}

#! returns a borrowed, zero-terminated slice; storage lasts for the process lifetime.
argument proc(index usize) ?[;0]u8 {
    if (index >= argument_count()) return null
    pointer :: _NSGetArgv()^[index]
    length := usize(0)
    while (pointer[length] != 0) length += 1
    return pointer[..length;0]
}